Packaging article comprising an envelope and an anhydrous dye composition comprising an oxidation dye, use of the same and process for dyeing keratin fibres

The present invention relates to a packaging article comprising an oxidation dye precursor for dyeing keratin fibres, in particular human hair.

Many people have sought for a long time to modify the colour of their hair and in particular to mask their grey hair.

It is known practice to obtain "permanent" or oxidation dyeing with dye compositions containing oxidation dye precursors, which are generally known as oxidation bases, such as ortho- or para-phenylenediamines, ortho- or para-aminophenols and heterocyclic compounds. These oxidation bases are initially colourless or weakly coloured compounds, which, when combined with oxidizing products, may give rise to coloured compounds via a process of oxidative condensation.

It is also known that it is possible to vary the shades obtained with these oxidation bases by combining them with couplers or dyeing modifiers, the latter being chosen especially from aromatic meta-diamines, meta-aminophenols, meta-diphenols and certain heterocyclic compounds such as indole compounds. The variety of molecules used as oxidation bases and couplers allows a wide range of colours to be obtained.

The permanent dyeing process therefore consists in applying to the keratin fibres bases or a mixture of bases and couplers with hydrogen peroxide (H ₂ 0 ₂ or bleach) as oxidation agent, in leaving them to diffuse on the fibres and then in rinsing the fibres. The colourings which result therefrom have the advantage of being permanent, powerful, and resistant with respect to external agents, in particular to light, bad weather, washing, perspiration and rubbing.

The dyeing process using oxidation dyes is usually performed starting with several compositions, at least one dye composition and at least one oxidizing composition, which are mixed together at the time of use just before application of the final, generally alkaline or neutral, composition to the fibres. Specifically, it is not possible to store in the same composition all the ingredients except the water, so as to avoid degradation of the hydrogen peroxide in alkaline or neutral aqueous medium, which induces the condensation reaction of the oxidation bases and couplers.

Thus, according to the usual practice, the dye composition(s), on the one hand, and the oxidizing aqueous composition, on the other hand, which has an acidic pH to ensure the stability of the hydrogen peroxide, are stored separately, and are not placed in contact until the time of use.

The need to use several compositions first entails drawbacks inherent in the storage of several compositions, with a larger storage area.

This moreover entails the need to measure out the compositions before placing them in contact. To overcome this drawback, it may be proposed to use kits (or multicompartment devices), but this nevertheless complicates the use of the compositions and increases the costs. Furthermore, in certain cases, the dye compositions and oxidizing compositions are in different galenical forms, for instance powders, granules, pastes or creams, which may complicate the mixing and the production of a homogeneous final composition (see, for example, US 2007/0006, US 2008/0 263 786, US 2009/0 056 039, US 2010/064 449, EP 23601604, WO 2012/015 034, WO 1 1/059 027, US 201 1/203 604, FR 0 756 173 and EP 2 01 1 474).

In addition, it is seen that the compositions derived from these powders, granules, pastes and creams do not always give compositions with satisfactory textures. Furthermore, the mixtures obtained do not always give the keratin fibres satisfactory colours, especially in terms of intensity, dyeing power, chromaticity and/or sparingly selective colourings, i.e. colourings that are sparingly homogeneous between the root and the end of the fibre. Moreover, they do not always lead to easy application with a suitable consistency.

Furthermore, during the use of pulverulent dye compositions, there may be a risk of contact between the dyes and alkaline agents and the user (clothing or skin surfaces).

Finally, using separate oxidizing compositions requires quite concentrated oxidizing solutions to be handled and the steps to be multiplied.

One aim of the present invention is thus to propose a composition for oxidation dyeing, which, while maintaining good dyeing properties, makes it possible simultaneously to solve the problem of the storage area, the stability of the storage of the compositions, which avoids the user coming into any direct contact with the dyes and other ingredients used in the oxidation dyeing, such as the alkaline agents and the chemical oxidizing agents, and which is easy to use and does not run outside the areas that it is desired to dye.

This/these aim(s) is/are achieved by the present invention, one subject of which is a packaging article comprising:

i) an envelope defining at least one cavity, the envelope comprising water-soluble and/or liposoluble fibres, preferably water-soluble polymer fibres;

ii) at least one anhydrous dye composition, preferably in paste or powder form, containing at least one oxidation dye; and

iii) optionally at least one anhydrous oxidizing agent, preferably in paste or powder form;

it being understood that the dye composition ii) and the chemical oxidizing agent iii), when it is present, are in one of the cavities defined by the envelope i).

Another object of the invention is a process for treating keratin fibres, especially human keratin fibres such as the hair, comprising at least a step of carrying out a packaging article as defined herein before. More particularly a process for dyeing keratin fibres, especially human keratin fibres such as the hair, comprising the following steps: i) mixing the packaging article of the invention with a composition that is capable of dissolving the packaging article, ii) applying the resulting composition to the keratin fibres, iii) leaving the composition to stand on the fibres, iv) rinsing the said fibres, v) optionally shampooing the fibres, rinsing them and drying them, the composition that is capable of dissolving the packaging article possibly containing an oxidizing agent.

Another subject of the invention is the use of the packaging article as defined previously for dyeing keratin fibres, preferably the hair.

The use of the packaging article makes it possible to obtain keratin fibre dye compositions whose consistency is pleasant on use, which are easy to apply and which do not run outside the areas to be treated. The colourings obtained on the keratin fibres have excellent dyeing properties especially in terms of the chromaticity, selectivity, intensity or persistence, which are identical, comparable to or even better than those of compositions with standard packaging, i.e. in separate liquid form. In addition, the packaging article of the invention makes it possible for there no longer to be direct contact between the user and the powdered ingredients.

Moreover, the packaging article has a size that is reduced to its strict minimum, very compact, without bulky packaging.

Other characteristics and advantages of the invention will emerge more clearly on reading the description and the examples that follow.

In the text hereinbelow, and unless otherwise indicated, the limits of a range of values are included within that range.

The expression "at least one" is equivalent to the expression "one or more".

A composition is said to be "anhydrous" when it comprises a water content of not more than 3% and preferably not more than 1 % by weight relative to the weight of the composition. Preferably, this water content is not more than 0.5% by weight relative to the weight of the composition or powder. More particularly, the water content ranges from 0 to 1 % by weight and preferably from 0 to 0.5% by weight relative to the total weight of the composition or powder.

The term "anhydrous paste" means an anhydrous composition with a viscosity of greater than 5 poises and preferably greater than 10 poises, measured at 25°C and at a shear rate of 1 s ^"1 ; this viscosity may be determined using a cone-plate rheometer.

The term "in anhydrous powder form" refers to an anhydrous composition or ingredient in pulverulent form, which is preferably substantially free of dust (or fine particles). In other words, the particle size distribution of the particles is such that the weight ratio of particles less than or equal to 100 micrometres in size (fines content) and preferably less than or equal to 65 micrometres in size (fines content) is advantageously less than or equal to 5%, preferably less than 2% and more particularly less than 1 % (particle size evaluated using a Retsch AS 200 Digit particle size analyser; oscillation height: 1 .25 mm/screening time: 5 minutes). Advantageously, the particle size is between 100 μηη and 3 mm and more particularly between 65 μηη and 2 mm.

According to a preferred embodiment of the invention, the dye composition comprising an oxidation dye and optionally the oxidizing agent are anhydrous in paste or powder form and are introduced into one or more cavities formed by the envelope.

The envelope may consist of a lap consisting of water-soluble and/or liposoluble fibres and which is folded on itself, or alternatively the envelope may consist of a first lap that is covered with a second lap also consisting of water-soluble and/or liposoluble fibres. The lap folded on itself or the two laps are then hermetically assembled so that the pastes or powders cannot diffuse out, the pastes or powders thus being hermetically enveloped by the envelope i).

The term "water-soluble" means soluble in water, in particular in a proportion of at least 10 grams per litre of water, preferably at least 20 g/l and better still at least 50 g/l, at a temperature of less than or equal to 35°C.

The term "liposoluble" means soluble in a liquid fatty substance as defined below, in particular in a proportion of at least 10 grams per litre of liquid fatty substance, in particular in a plant oil or mineral oil such as liquid petroleum jelly, preferably at least 20 g/l in a liquid fatty substance, better still at least 50 g/l in a fatty substance, at a temperature of less than or equal to 35°C.

The term "temperature of less than or equal to 35°C" means a temperature not exceeding 35°C but greater than or equal to 0°C, for example ranging from more than 1 .0°C to 35°C, better still from 5°C to 30°C and even better still from 10°C to 30°C or 10°C to 20°C. It is understood that all the temperatures are given at atmospheric pressure.

The packaging article according to the invention is preferably water-soluble or liposoluble at a temperature of less than or equal to 35°C.

i) an envelope comprising water-soluble and/or liposoluble fibres

The packaging article according to the invention comprises an envelope which defines at least one cavity, the cavity(ies) containing at least one anhydrous dye composition containing at least one oxidation dye, the packaging article optionally containing at least one chemical oxidizing agent in one of its cavities. The packaging article preferably comprises only one cavity.

The envelope of the present invention comprises one or more laps of water- soluble and/or liposoluble fibres and one or more cavities containing the anhydrous dye composition, the dye composition being separate from the lap or from the envelope. Such an envelope is different from water-soluble or liposoluble thin films in which the dye composition would be incorporated in the lap(s) forming the envelope. Relative to these water-soluble or liposoluble thin films, the envelope according to the invention has the advantage of allowing the incorporation of constituents that are incompatible therewith, and of being simpler to use since it does not require any premixing or any dissolution in a solvent of the constituents, or any heating to evaporate the solvent. The process for manufacturing the packaging article of the invention is also faster and less expensive than the process for manufacturing thin films.

Furthermore, when the active agents, in this case in particular the oxidation dyes, are used in dispersion to form a thin film, this may give rise to compatibility problems and mechanical problems (breaking of the film) and may impose limits on the concentration of active agents. In addition, the envelope and the laps that are useful for the invention have the advantage of allowing wider diversity in the choice of the shape and appearance of the article, since the water-soluble and/or liposoluble lap(s) may have a variable thickness and a variable density, giving access to a wide variety of shapes and sizes, whereas the thin film is difficult to dry if the thickness is too large, and it is fragile and difficult to manipulate if the size is too large.

Advantageously, the envelope or the laps are "touch-deformable" , which especially means that the envelope and the laps become deformed when they are held and pinched between a user's fingers.

Preferably, the anhydrous dye composition in powder or paste form and optionally the anhydrous oxidizing agent(s) in powder or paste form are present in a cavity generated by at least two laps constituting the envelope and defining between them a cavity, the said laps preferably comprising water-soluble fibres.

According to a particular embodiment of the invention, at least one of the laps of the packaging article consists exclusively of water-soluble fibres, and more preferentially all the laps of the packaging article of the invention consist exclusively of water-soluble fibres, preferably water-soluble at a temperature of less than or equal to 30°C.

The term "fibre" means any object whose length is greater than its cross section. In other words, it should be understood as meaning an object of length L and of diameter D such that L is greater and preferably very much greater (i.e. at least three times greater) than D, D being the diameter of the circle in which the cross section of the fibre is inscribed. In particular, the ratio L/D (or aspect ratio) is chosen in the range from 3.5 to 2500, preferably from 5 to 500 and better still from 5 to 150. The cross section of a fibre may have any round, toothed or fluted shape, or alternatively a bean shape, but also multilobate, in particular trilobate or pentalobate, X-shaped, ribbon-shaped, square, triangular, elliptical or the like. The fibres of the invention may or may not be hollow. The fibres used according to the present invention may be of natural, synthetic or even artificial origin. Advantageously, the said fibres are of synthetic origin.

A "natural fibre" is by definition a fibre that is naturally present in nature, directly or after mechanical and/or physical treatment. Fibres of animal origin, cellulose fibres, in particular extracted from wood, plants or algae, and rayon fibres, are collated in this category.

The "artificial fibres" are either totally synthetic or derived from natural fibres that have been subjected to one or more chemical treatments in order especially to improve their mechanical and/or physicochemical properties.

The "synthetic fibres" collate fibres obtained by chemical synthesis and are generally fibres consisting of one or more mono-component or multi-component, composite or non-composite polymers and/or copolymers, which are generally extruded and/or drawn to the desired diameter of the fibre.

Preferably, the fibres of the invention consist of one or more water-soluble polymers.

The water-soluble polymer(s) of the invention contain in their backbones water- soluble units. The water-soluble units are obtained from one or more water-soluble monomers.

The term "water-soluble monomer" means a monomer whose solubility in water is greater than or equal to 1 % and preferably greater than or equal to 5% at 25°C and at atmospheric pressure (760 mmHg).

The said synthetic water-soluble polymer(s) used in the context of the present invention are advantageously obtained from water-soluble monomers comprising at least one double bond. These monomers may be chosen from cationic, anionic and nonionic monomers, and mixtures thereof.

As water-soluble monomers that may be used as precursors of the water-soluble units, alone or as a mixture, examples that may be mentioned include the following monomers, which may be in free or salified form:

- (meth)acrylic acid,

- styrenesulfonic acid,

- vinyl sulfonic acid and (meth)allylsulfonic acid,

- vinylphosphonic acid,

- N-vinylacetamide and N-methyl-N-vinylacetamide,

- N-vinylformamide and N-methyl-N-vinylformamide,

- N-vinyllactams comprising a cyclic alkyl group containing from 4 to 9 carbon atoms, such as N-vinylpyrrolidone, N-butyrolactam and N-vinylcaprolactam,

- maleic anhydride,

- itaconic acid,

- vinyl alcohol of formula CH ₂ =CHOH,

- vinyl ethers of formula CH ₂ =CHOR in which R is a linear or branched, saturated or unsaturated hydrocarbon-based radical containing from 1 to 6 carbons,

- dimethyldiallylammonium halides (chloride), - quaternized dimethylaminoethyl methacrylate (DMAEMA),

- (meth)aci lamidopropyltrimethylammonium halides (chloride) (APTAC and MAPTAC),

- methylvinylimidazolium halides (chloride),

- 2-vinylpyridine and 4-vinylpyridine,

- acrylonitrile,

- glycidyl (meth)acrylate,

- vinyl halides (chloride) and vinylidene chloride,

- vinyl monomers of formula (I) below:

H ₂ C = C( R)-C(O)-X ( I)

in which formula (I):

- R is chosen from H and (CrC ₆ )alkyl such as methyl, ethyl and propyl;

- X is chosen from:

- alkoxy of -OR' type in which R' is a linear or branched, saturated or unsaturated hydrocarbon-based radical containing from 1 to 6 carbon atoms, optionally substituted with at least one halogen atom (iodine, bromine, chlorine or fluorine); a sulfonic (-S0 ₃ ^" ), sulfate (-SO4 ^" ), phosphate (-P0 ₄ H ₂ ); hydroxyl (-OH); primary amine (-NH ₂ ); secondary amine (-NHR ₆ ), tertiary amine (-NR ₆ R ₇ ) or quaternary amine (-N ⁺ R ₆ R ₇ R8) group with R ₆ , R ₇ and R ₈ being, independently of each other, a linear or branched, saturated or unsaturated hydrocarbon-based radical containing 1 to 6 carbon atoms, with the proviso that the sum of the carbon atoms of R' + R ₆ + R ₇ + Re does not exceed 6;

- groups -NH ₂ , -NHR' and -NR'R" in which R' and R" are, independently of each other, linear or branched, saturated or unsaturated hydrocarbon-based radicals containing 1 to 6 carbon atoms, with the proviso that the total number of carbon atoms of R' + R" does not exceed 6, the said R' and R" being optionally substituted with one halogen atom (iodine, bromine, chlorine or fluorine); a hydroxy (-OH); sulfonic (-S0 ₃ ^" ), sulfate (-S0 ₄ ^" ), phosphate (-P0 ₄ H ₂ ); primary amine (-NH ₂ ); secondary amine (-NHR ₆ ), tertiary amine (- NR ₆ R ₇ ) and/or quaternary amine (-N ⁺ R ₆ R ₇ R8) group with R ₆ , R ₇ and R ₈ being, independently of each other, a linear or branched, saturated or unsaturated hydrocarbon- based radical containing 1 to 6 carbon atoms, with the proviso that the sum of the carbon atoms of R' + R" + R ₆ + R ₇ + Re does not exceed 6. As compounds corresponding to this formula, examples that may be mentioned include Ν,Ν-dimethylacrylamide and N,N- diethylacrylamide;

- and mixtures thereof.

Anionic monomers that may especially be mentioned include (meth)acrylic acid, acrylamido-2-methylpropanesulfonic acid, itaconic acid and alkali metal, alkaline-earth metal or ammonium salts thereof or salts thereof derived from an organic amine such as an alkanolamine.

Nonionic monomers that may especially be mentioned include (meth)acrylamide, N- vinylformamide, N-vinylacetamide, hydroxypropyl (meth)acrylate and the vinyl alcohol of formula CH ₂ =CHOH.

The cationic monomers are preferably chosen from quaternary ammonium salts derived from a diallylamine and those corresponding to formula (II) below:

H ₂ C = C( R i )- D- N ⁺ R ₂ R ₃ R4 , X ^"

in which formula (II):

• Ri represents a hydrogen atom or a methyl group,

• R ₂ and R ₃ , which may be identical or different, represent a hydrogen atom or a linear or branched CrC ₄ alkyl group,

• R ₄ represents a hydrogen atom or a linear or branched CrC ₄ alkyl group or an aryl group,

• D represents the following divalent unit: -(Y) _n -(A)- in which:

- Y represents an amide function, an ester (O-C(O) or C(O)-O), a urethane or a urea,

A represents a linear or branched, cyclic or acyclic C-I-C-IO alkylene group, which may be substituted or interrupted with a divalent aromatic or heteroaromatic group. The alkylene groups may be interrupted with an oxygen atom, a nitrogen atom, a sulfur atom or a phosphorus atom; the alkylene may be interrupted with a ketone function, an amide, an ester (O-C(O) or C(O)-O), a urethane or a urea,

- n is an integer ranging from 0 to 1 ,

• X ^" represents an anionic counterion, for instance a chloride or a sulfate.

Examples of water-soluble cationic monomers that may especially be mentioned include the following compounds, and also salts thereof: dimethylaminoethyl, (meth)acryloyloxyethyltrimethylammonium,

(meth)acryloyloxyethyldimethylbenzylammonium, N- [dimethylaminopropyl](meth)acrylamide, (meth)acrylamidopropyltrimethylammonium, (meth)acrylamidopropyldimethylbenzylammonium, dimethylaminohydroxypropryl, (meth)acryloyloxyhydroxypropyltrimethylammonium,

(meth)acryloyloxyhydroxypropyldimethylbenzylammonium and dimethyldiallylammonium (meth)acrylate.

Preferably, the polymer that is useful according to the invention is polymerized from at least one cationic monomer as defined above.

Preferably, the polymers are polymerized from the following monomers comprising at least one double bond as follows:

- 0 to 30 mol% of acrylic acid,

- 0 to 95.5 mol% of acrylamide, and

- 0.5 mol% to 100 mol% of at least one cationic monomer represented in formula (II) as defined above.

As polymers that are particularly preferred in the invention, mention may be made especially of those polymerized from:

- 10% of acryloyloxyethyldimethylbenzylammonium chloride and 90% of acrylamide, 30% of acryloyloxytrimethylammonium chloride, 50% of acryloyloxyethyldimethylbenzylammonium chloride and 20% of acrylamide,

- 10% of acryloyloxyethyltrimethylammonium chloride and 90% of acrylamide, - 30% of diallyldimethylammonium chloride and 70% of acrylamide,

- 30% of acrylic acid and 70% of acrylamide.

According to a particular embodiment, the polymers are polymerized from a cationic monomer and acrylic acid, the number of moles of the cationic monomer being greater than the number of moles of acrylic acid.

As water-soluble polymers derived from natural products, mention may be made of polysaccharides, i.e. polymers bearing a sugar unit or sugar units.

The term "sugar unit" means a unit derived from a carbohydrate of formula C _n (H ₂ 0)n-i or (CH ₂ 0) _n , which may be optionally modified by substitution and/or by oxidation and/or by dehydration. The sugar units that may be included in the composition of the polymers of the invention are preferably derived from the following sugars: glucose, galactose, arabinose, rhamnose, mannose, xylose, fucose, fructose, anhydrogalactose, galacturonic acid, glucuronic acid, mannuronic acid, galactose sulfate or anhydrogalactose sulfate.

The polymers bearing a sugar unit or sugar units according to the invention may be of natural or synthetic origin. They may be nonionic, anionic, amphoteric or cationic. The base units of the polymers bearing a sugar unit of the invention may be monosaccharides or disaccharides.

As polymers that may be used, mention may be made especially of the following native gums, and also derivatives thereof:

a) tree or shrub exudates, including:

- gum arabic (branched polymer of galactose, arabinose, rhamnose and glucuronic acid);

- ghatti gum (polymer derived from arabinose, galactose, mannose, xylose and glucuronic acid);

- karaya gum (polymer derived from galacturonic acid, galactose, rhamnose and glucuronic acid);

- gum tragacanth (or tragacanth) (polymer of galacturonic acid, galactose, fucose, xylose and arabinose);

b) gums derived from algae, including:

- agar (polymer derived from galactose and anhydrogalactose);

- alginates (polymers of mannuronic acid and of glucuronic acid);

- carrageenans and furcellerans (polymers of galactose sulfate and of anhydrogalactose sulfate);

c) gums derived from seeds or tubers, including:

- guar gum (polymer of mannose and galactose);

- locust bean gum (polymer of mannose and galactose); - fenugreek gum (polymer of mannose and galactose);

- tamarind gum (polymer of galactose, xylose and glucose);

- konjac gum (polymer of glucose and mannose) in which the main constituent is glucomannan, a polysaccharide of high molecular weight (500 000 < M _g i _ucomannan < 2 000 000) composed of D-mannose and D-glucose units with a branch every 50 or 60 units approximately;

d) microbial gums, including:

- xanthan gum (polymer of glucose, mannose acetate, mannose/pyruvic acid and glucuronic acid);

- gellan gum (polymer of partially acylated glucose, rhamnose and glucuronic acid);

- scleroglucan gum (glucose polymer);

- biosaccharide gum (polymer of galacturonic acid, fucose and D-galactose), for example the product sold under the name Fucogel 1.5P from Solabia (polysaccharide rich in fucose (20%) at 1.1 % in water and stabilized (1 .5% phenoxyethanol));

e) plant extracts, including:

- cellulose (glucose polymer);

- starch (glucose polymer);

- inulin (polymer of fructose and glucose).

These polymers may be physically or chemically modified. A physical treatment that may especially be mentioned is the temperature. Chemical treatments that may be mentioned include esterification, etherification, amidation or oxidation reactions. These treatments can lead to polymers that may be nonionic, anionic, cationic or amphoteric.

Preferably, these chemical or physical treatments are applied to guar gums, locust bean gums, starches and celluloses.

The nonionic guar gums that may be used according to the invention may be modified with Ci-C ₆ hydroxyalkyl groups. Among the hydroxyalkyl groups that may be mentioned are hydroxy methyl, hydroxyethyl, hydroxypropyl and hydroxybutyl groups.

These guar gums are well known in the prior art and may be prepared, for example, by reacting the corresponding alkene oxides, for instance propylene oxides, with the guar gum so as to obtain a guar gum modified with hydroxypropyl groups.

The degree of hydroxyalkylation preferably ranges from 0.4 to 1.2, and corresponds to the number of alkylene oxide molecules consumed by the number of free hydroxyl functions present on the guar gum.

Such nonionic guar gums optionally modified with hydroxyalkyl groups are sold, for example, under the trade names Jaguar HP8, Jaguar HP60 and Jaguar HP120 by the company Rhodia Chimie.

The guar gums modified with cationic groups that may be used more particularly according to the invention are guar gums comprising trialkylammonium cationic groups. Preferably, 2% to 30% by number of the hydroxyl functions of these guar gums bear trialkylammonium cationic groups. Even more preferentially, 5% to 20% by number of the hydroxyl functions of these guar gums are branched with trialkylammonium cationic groups. Among these trialkylammonium groups, mention may be made most particularly of trimethylammonium and triethylammonium groups. Even more preferentially, these groups represent from 5% to 20% by weight relative to the total weight of the modified guar gum.

According to the invention, use may be made of guar gums modified with 2,3- epoxypropyltrimethylammonium chloride.

These guar gums modified with cationic groups are products already known per se and are, for example, described in patents US 3 589 578 and US 4 0131 307. Such products are moreover sold especially under the trade names Jaguar C13 S, Jaguar C 15 and Jaguar C 17 by the company Rhodia Chimie.

A modified locust bean gum that may be used is cationic locust bean gum containing hydroxypropyltrimonium groups, such as Catinal CLB 200 sold by the company Toho.

The starch molecules used in the present invention may originate from any plant source of starch, especially cereals and tubers; more particularly, they may be starches from corn, rice, cassava, barley, potato, wheat, sorghum, pea, oat or tapioca. It is also possible to use the starch hydrolysates mentioned above. The starch is preferably derived from potato.

The starches may be chemically or physically modified, especially by one or more of the following reactions: pregelatinization, oxidation, crosslinking, esterification, etherification, amidation and heat treatments.

More particularly, these reactions may be performed in the following manner:

- pregelatinization by splitting the starch granules (for example drying and cooking in a drying drum);

- oxidation with strong oxidizing agents, leading to the introduction of carboxyl groups into the starch molecule and to depolymerization of the starch molecule (for example by treating an aqueous starch solution with sodium hypochlorite);

- crosslinking with functional agents capable of reacting with the hydroxyl groups of the starch molecules, which will thus bond together (for example with glyceryl and/or phosphate groups);

- esterification in alkaline medium for the grafting of functional groups, especially Ci-C ₆ acyl (acetyl), Ci-C ₆ hydroxyalkyi (hydroxyethyl or hydroxypropyl), carboxymethyl or octenylsuccinic.

Monostarch phosphates (of the type Am-0-PO-(OX) ₂ ), distarch phosphates (of the type Am-O-PO-(OX)-O-Am) or even tristarch phosphates (of the type Am-0-PO-(0-Am) ₂ ) or mixtures thereof may especially be obtained by crosslinking with phosphorus compounds, Am meaning starch and X especially denoting alkali metals (for example sodium or potassium), alkaline-earth metals (for example calcium or magnesium), ammonium salts, amine salts, for instance those of monoethanolamine, diethanolamine, triethanolamine, 3-amino-1 ,2-propanediol, or ammonium salts derived from basic amino acids such as lysine, arginine, sarcosine, ornithine or citrulline.

The phosphorus compounds may be, for example, sodium tripolyphosphate, sodium orthophosphate, phosphorus oxychloride or sodium trimetaphosphate.

Distarch phosphates or compounds rich in distarch phosphate will preferentially be used, for instance the product sold under the references Prejel VA-70-T AGGL (gelatinized hydroxypropyl cassava distarch phosphate), Prejel TK1 (gelatinized cassava distarch phosphate) and Prejel 200 (gelatinized acetyl cassava distarch phosphate) by the company Avebe, or Structure Zea from National Starch (gelatinized corn distarch phosphate).

A preferred starch is a starch that has undergone at least one chemical modification such as at least one esterification.

According to the invention, amphoteric starches comprising one or more anionic groups and one or more cationic groups may also be used. The anionic and cationic groups may be linked to the same reactive site of the starch molecule or to different reactive sites; they are preferably linked to the same reactive site. The anionic groups may be of carboxylic, phosphate or sulfate type, preferably carboxylic. The cationic groups may be of primary, secondary, tertiary or quaternary amine type.

The amphoteric starches are especially chosen from the compounds having the following formulae:

S _t - 0 - (CH _2)n - N

(I)

R' R" R\ _, R"

N N

I I

St - O - C— C— COOM St - O - C— C— COOM

H ₂ H H H ₂

(Hi) (IV)

in which formulae (I) to (IV):

· St-0 represents a starch molecule;

• R, which may be identical or different, represents a hydrogen atom or a methyl radical;

• R', which may be identical or different, represents a hydrogen atom, a methyl radical or a group -C(0)-OH;

• n is an integer equal to 2 or 3;

• M, which may be identical or different, denotes a hydrogen atom, an alkali metal or alkaline-earth metal such as Na, K or Li, a quaternary ammonium NH ₄ , or an organic amine,

• " represents a hydrogen atom or a Ci-Ci ₈ alkyl radical.

These compounds are especially described in US 5 455 340 and US 4 017 460.

Use is particularly made of the starches of formula (II) or (III); and preferentially starches modified with 2-chloroethylaminodipropionic acid, i.e. starches of formula (II) or (III) in which R, R', R" and M represent a hydrogen atom and n is equal to 2. The preferred amphoteric starch is a starch chloroethylamidodipropionate.

The celluloses and cellulose derivatives may be anionic, cationic, amphoteric or nonionic.

Among these derivatives, cellulose ethers, cellulose esters and cellulose ester ethers are distinguished.

Among the cellulose esters, mention may be made of mineral cellulose esters (cellulose nitrates, sulfates and phosphates), organic cellulose esters (cellulose monoacetates, triacetates, amidopropionates, acetate butyrates, acetate propionates and acetate trimellitates), and mixed organic/mineral cellulose esters, such as cellulose acetate butyrate sulfates and cellulose acetate propionate sulfates.

Among the cellulose ester ethers, mention may be made of hydroxypropylmethylcellulose phthalates and ethylcellulose sulfates.

Among the nonionic cellulose ethers that may be mentioned are alkylcelluloses such as methylcelluloses and ethylcelluloses (for example Ethocel Standard 100 Premium from Dow Chemical); hydroxyalkylcelluloses such as hydroxymethylcelluloses and hydroxyethylcelluloses (for example Natrosol 250 HHR sold by Aqualon) and hydroxypropylcelluloses (for example Klucel EF from Aqualon); mixed hydroxyalkyl- alkylcelluloses such as hydroxypropylmethylcelluloses (for example Methocel E4M from Dow Chemical), hydroxyethylmethylcelluloses, hydroxyethylethylcelluloses (for example Bermocoll E 481 FQ from Akzo Nobel) and hydroxybutylmethylcelluloses.

Among the anionic cellulose ethers, mention may be made of carboxyalkylcelluloses and salts thereof. Examples that may be mentioned include carboxymethylcelluloses, carboxymethylmethylcelluloses (for example Blanose 7M from the company Aqualon) and carboxymethylhydroxyethylcelluloses, and also the sodium salts thereof.

Among the cationic cellulose ethers, mention may be made of crosslinked or non- crosslinked, quaternized hydroxyethylcelluloses. The quaternizing agent may especially be diallyldimethylammonium chloride (for example Celquat L200 from National Starch). Another cationic cellulose ether that may be mentioned is hydroxypropyltrimethylammonium hydroxyethyl cellulose (for example Ucare Polymer JR 400 from Amerchol).

Among the associative polymers bearing a sugar unit or sugar units, mention may be made of celluloses or derivatives thereof, modified with groups comprising at least one fatty chain, such as alkyl, arylalkyi or alkylaryl groups or mixtures thereof in which the alkyl groups are of C8-C22; nonionic alkylhydroxyethylcelluloses such as the products Natrosol Plus Grade 330 CS and Polysurf 67 (Ci ₆ alkyl) sold by the company Aqualon; quaternized alkylhydroxyethylcelluloses (cationic), such as the products Quatrisoft LM 200, Quatrisoft LM-X 529-18-A, Quatrisoft LM-X 529-18-B (C _i2 alkyl) and Quatrisoft LM-X 529-8 (Ci ₈ alkyl) sold by the company Amerchol, the products Crodacel QM and Crodacel QL (Ci2 alkyl) and Crodacel QS (Ci ₈ alkyl) sold by the company Croda, and the product Softcat SL 100 sold by the company Amerchol; nonionic nonoxynylhydroxyethylcelluloses such as the product Amercell HM-1500 sold by the company Amerchol; nonionic alkylcelluloses such as the product Bermocoll EHM 100 sold by the company Berol Nobel.

As associative polymers bearing a sugar unit or sugar units derived from guar, mention may be made of hydroxypropyl guars modified with a fatty chain, such as the product Esaflor HM 22 (modified with a C22 alkyl chain) sold by the company Lamberti; the product Miracare XC 95-3 (modified with a C14 alkyl chain) and the product RE 205- 146 (modified with a C ₂₀ alkyl chain) sold by Rhodia Chimie.

The polymer(s) bearing a sugar unit or sugar units of the invention are preferably chosen from guar gums, locust bean gums, xanthan gums, starches and celluloses, in their modified form (derivatives) or unmodified.

Preferably, the polymers bearing a sugar unit or sugar units according to the invention are nonionic.

More preferably, the polymer(s) bearing a sugar unit or sugar units of the invention are chosen from modified nonionic guar gums, especially modified with Ci-C ₆ hydroxyalkyl groups.

The polymers described above more particularly have a weight-average molecular weight of greater than 1 000 000 and preferably between 1 000 000 and 50 000 000. The molecular weight is determined by the RSV (Reduced Specific Viscosity) method as defined in "Principles of Polymer Chemistry" Cornell University Press, Ithaca, NY 1953 Chapter VII "Determination of molecular weight" pp. 266-316.

The fibres may be spun, carded or twisted. Advantageously, the fibres used in the context of the present invention are spun. The mean diameter of the fibres used according to the present invention, which may be identical or different, is less than 500 μηη. Advantageously, such a diameter is less than 200 μηη, preferably less than 100 μηη or even less than 50 μηη.

Mention may be made more particularly of water-soluble fibres that include fibres based on polyvinyl alcohol, fibres of polysaccharides such as glucomannans, starches or celluloses such as carboxymethylcelluloses, polyalginic acid fibres, polylactic acid fibres and polyalkylene oxide fibres, and also mixtures thereof. More preferentially, the water- soluble fibre(s) used in the invention are chosen from PVA-based fibres.

More particularly the envelope i) comprises natural, artificial or synthetic water- soluble polymer fibres, preferably chosen from polyvinyl alcohol (PVA) fibres, polysaccharide fibres such as cellulose and more specifically hydroxyalkylcelluloses, polylactic acid fibres and polyalkylene oxide fibres, and mixtures thereof; more preferably selected from PVA and hydroxyl(Ci-C ₆ )alkylcelluloses.

The fibres of the envelope or of the laps are generally entangled. As indicated above, the term "envelope or lap comprising water-soluble fibres" means an envelope or laps which may consist entirely of water-soluble fibres or a lap which may comprise both water-soluble fibres and fibres that are insoluble in water at a temperature of less than or equal to 35°C, the soluble fibres necessarily being in a larger amount than the insoluble fibres. The lap of fibres should comprise at least 60% by weight, preferably at least 70% and better still at least 80% by weight of soluble fibres relative to the total weight of fibres. It may thus comprise, for example, more than 95% by weight, or even more than 99% by weight and even 100% by weight of water-soluble fibres relative to the total weight of fibres in the envelope or the laps.

When the lap of fibres contains insoluble fibres, the latter fibres may be made of any material usually used as insoluble fibres; they may be, for example, silk fibre, cotton fibre, wool fibre, flax fibre, polyamide (Nylon®) fibre, polylactic acid fibre, modified cellulose (rayon, viscose or rayon acetate) fibre, poly-p-phenyleneterephthalamide fibre, especially Kevlar® fibre, polyolefin fibre and especially polyethylene or polypropylene fibre, glass fibre, silica fibre, aramid fibre, carbon fibre, especially in graphite form, Teflon® fibre, insoluble collagen fibre, polyester fibre, polyvinyl or polyvinylidene chloride fibre, polyethylene terephthalate fibre, and fibres formed from a mixture of the compounds mentioned above, for instance polyamide/polyester or viscose/polyester fibres.

In addition, the envelope and the laps of the invention may be woven or nonwoven.

According to a particular embodiment, the envelope and the laps of the invention are woven. In the context of the present invention, a "woven" results from an organized assembly of fibres, in particular of water-soluble polymeric fibres, and more particularly of an intercrossing, in the same plane, of the said fibres, arranged in the warp direction and of fibres arranged perpendicular to the warp fibres, in the weft direction. The binding obtained between these warp and weft fibres is defined by a weave.

Such a woven material results from an operation directed towards assembling the fibres in an organized manner such as weaving per se, but may also result from knitting.

More particularly, the two layers or laps comprising the woven polymeric water- soluble fibres that constitute the envelope of the packaging article of the invention do not comprise any other additional layer superposed thereon.

According to another particularly advantageous mode of the invention, the envelope and the laps are nonwoven.

Nonwovens are described in general in Riedel's Nonwoven Bonding Methods &

Materials, Nonwoven World (1987), which is incorporated herein by reference.

For the purposes of the present invention, the expression "nonwoven" means a substrate comprising fibres, in particular water-soluble polymeric fibres, in which substrate the individual fibres are arranged in a disordered manner in a structure in the form of a lap and which are neither woven nor knitted. The fibres of the nonwoven are generally bonded together, either under the effect of a mechanical action (for example needle punching, air jet, water jet, etc.), or under the effect of a thermal action, or by addition of a binder.

Such a nonwoven is, for example, defined by standard ISO 9092 as a web or lap of directionally or randomly orientated fibres, bonded by friction and/or cohesion and/or adhesion, excluding paper and products obtained by weaving, knitting, tufting or stitching incorporating binding yarns or filaments.

A nonwoven differs from a paper by virtue of the length of the fibres used. In paper, the fibres are shorter. However, nonwovens exist based on cellulose fibre, which are manufactured by a wet-laid process and which have short fibres as in paper. The difference between a nonwoven and a paper is generally the absence of hydrogen bonding between the fibres in a nonwoven.

Very preferentially, the fibres used in the context of the present invention are chosen from synthetic fibres such as PVA fibres. In particular, the envelope and laps of the invention are nonwoven, and preferentially made of nonwoven PVA fibres.

To produce the nonwoven water-soluble lap(s) of the envelope of the packaging article, use is preferably made of PVA fibres that are soluble in water at a temperature of less than or equal to 35°C, for instance the fibres sold by the Japanese company Kuraray under the name Kuralon K-ll, and particularly the grade WN2 which is soluble at and above 20°C. These fibres are described in document EP-A-636 716 which teaches the manufacture of PVA fibres that are soluble in water at temperatures not exceeding 100°C, by spinning and drawing the polyvinyl alcohol polymer in dry or wet form in the presence of solvents participating in the dissolution and solidification of the fibre. The fibre thus obtained may lead to the production of woven or nonwoven substrates. According to a particular mode of the invention, the PVA fibres of the examples of EP-A- 636 716 are used, especially Example 2 and Comparative Example 1 : commercial product Solvron SS.

These fibres may also be prepared from a solution to be spun, by dissolving a water-soluble PVA-based polymer in a first organic solvent, spinning the solution in a second organic solvent to obtain solidified filaments and wet-drawing of the filaments from which the first solvent is removed, and which are then dried and subjected to a heat treatment. The cross section of these fibres may be substantially circular. These fibres have a tensile strength of at least 2.7 g/dtex (3 g/d). Patent application EP-A-0 636 716 describes such PVA-based water-soluble fibres and the process for manufacturing them. For example, the fibres may also be formed by extrusion and deposited on a conveyor to form a lap of fibres which is then consolidated via a standard fibre bonding technique, for instance needle punching, hot-bonding, calendering or air-through bonding, in which technique the water-soluble lap passes through a tunnel in which hot air is blown, or hydroentanglement directed towards bonding the fibres via the action of fine jets of water at very high pressure, which cannot be applied to fibres whose dissolution temperature is too low pressure.

As has been seen previously, the invention is not limited to the use of PVA, and use may also be made of fibres made of other water-soluble materials, provided that these materials dissolve in water having the desired temperature, for example the polysaccharide fibres sold under the name Lysorb by the company Lysac Technologies, Inc. or other fibres based on polysaccharide polymers such as glucomannans or starch.

The laps of the envelope may comprise a mixture of different fibres that are soluble in water at various temperatures (up to 35°C).

The fibres may be composite, and they may comprise, for example, a core and a sheath not having the same nature, for example formed from different grades of PVA.

According to a particular embodiment of the invention, the lap(s) of the envelope have a nonwoven comprising water-soluble fibres, alone or as a mixture with insoluble fibres as indicated above, with not more than 40% by weight of insoluble fibres relative to the total weight of the fibres constituting the lap. Preferably, the nonwoven consists essentially of water-soluble fibres, i.e. it does not contain any insoluble fibres.

The envelope may have any shape that is suitable for the intended use, for example a rectangular, circular or oval shape, and it preferably has dimensions that enable it to be held between at least two fingers. Thus, the envelope or the laps may have, for example, an ovoid shape from about 2 to 10 cm long and from about 0.5 to 4 cm wide, or a circular disc shape from about 2 to 10 cm in diameter, or a square shape with a side length from about 5 to 15 cm, or a rectangular shape with a length from about 5 to 25 cm, it being understood that it may have any other shape and size that are suitable for the desired use.

Advantageously, the envelope and the laps have a low thickness, the laps possibly consisting of several layers. Preferably, the thickness of the envelope and of the laps ranges from 3% to 99.9% of its other dimensions. This thickness is especially less than 100 mm. The envelope and the laps are thus substantially flat, thin slices.

The surface delimiting the cavity(ies) has an area generally less than 625 cm ² , for example between 400 cm ² and 0.025 cm ² .

Use may be made, for example, of an envelope and laps as defined in French patent application FR 12/61 120 deposited on 22 November 2012.

The article according to the present invention may comprise one or more nonwoven laps and water-soluble envelope.

Preferentially, the amount of envelope present in the article according to the invention is inclusively between 0.5% and 20.0% by weight relative to the total weight of the said article, advantageously inclusively between 1.0% and 10.0%, particularly inclusively between 2.0% and 5.0% and more particularly 3% by weight relative to the total weight of the packaging article.

Figure 1 a) is a cross section of a particular embodiment of the packaging article comprising the envelope i) consisting of two laps, which are preferably water-soluble, 1 1 and 12, bonded together in a peripheral region 14. Preferably, the two laps are joined by any suitable fixing means such as glueing, welding, especially heat-welding, and in particular by entanglement. The first lap 1 1 also has a free central region D arranged facing a free central region D of the second lap 12. These two central regions delimit a central cavity, the said cavity containing an anhydrous dye composition 13 as defined previously comprising at least one oxidation dye optionally mixed with other ingredients.

The laps 1 1 and 12 have a closed outer perimeter 15. The shape of the outer perimeter 15 is, for example, rounded, such as circular or elliptical, or polygonal, such as square, rectangular or triangular, preferably circular.

Figure 1 b) shows a top view of the packaging article as described in Figure 1 a), in which part D corresponds to the cavity or "central region" in which is found the anhydrous dye composition 13 as defined previously, and d corresponds to the peripheral region hermetically joining the two laps 1 1 and 12.

Figure 1 c) shows a cross section of a particular embodiment of the packaging article, comprising an envelope consisting of two laps 1 1 and 12, which are preferably water-soluble, and comprising an additional lap 16, which is preferably water-soluble, and optionally other additional laps 17, which are preferably water-soluble, which define several cavities in which are housed the ingredients such as the anhydrous dye composition as defined previously comprising at least one oxidation dye 18, chemical oxidizing agents and the direct dyes 19 or the powdered persalts 20 as defined below.

The first lap 1 1 has a thickness smaller than its other dimensions, for example less than 10% of its maximum transverse dimension D+2d.

The thickness of the first lap 1 1 is, for example, less than 10 mm and especially between 0.1 mm and 3 mm. Its maximum transverse dimension D+d is, for example, less than 100 mm, and is especially inclusively between 10 mm and 60 mm.

The first lap 1 1 thus forms a veil, for example made of nonwoven, which itself may consist of several veils of nonwoven that are consolidated together. The second lap 12 also has a closed outer perimeter 15. The outer perimeter 15 of the first layer 1 1 has a shape substantially identical to the outer perimeter 15 of the second layer 12.

The second lap 12 has a thickness smaller than its other dimensions, for example less than 10% of its maximum transverse dimension D+2d.

The thickness of the second lap 12, which is preferably water-soluble, is, for example, less than 10 mm and especially between 0.1 mm and 3 mm. Its maximum transverse dimension D+2d is less than 100 mm, and is especially between 10 mm and 60 mm.

The thickness is advantageously measured according to the standard EDANA

WSP 120.1 (5).

The second lap 12 is advantageously a nonwoven.

The first lap 1 1 and the second lap 12, which may be identical or of different thicknesses, densities and/or compositions, are preferably nonwovens that are water- soluble at a temperature of less than or equal to 35°C. The laps and nonwoven envelope are soluble in an aqueous solution, such as water. The nonwoven laps and envelope are preferentially made of PVA.

As a variant, the second lap may be formed by the first lap folded on itself 1 1 ' shown in Figure 1 d) in cross section and Figure 1 e) in top view. The lap is folded on itself along the folding axis e which defines a cavity in which is found the dye composition comprising at least one oxidation dye 18' and optionally at least one chemical oxidizing agent as defined below and/or at least one direct dye as defined below, preferably a powdered direct dye and/or the excipients as defined below, which are preferably in powder form 19', optionally separated by one or more water-soluble laps 16'. The lap 1 1 ', once filled with the ingredients 19' and with the water-soluble lap(s) 16', is folded along the axis e, forming a folding zone 15' and then joined at a peripheral region 14, the shaded part of Figure e), preferably via any suitable fixing means such as glueing, welding, especially heat-welding, and in particular by entanglement. The thickness of the water-soluble lap 1 1 ' and the transverse dimensions satisfy the same criteria as those defined for the lap 1 1 or 12 of Figure 1 b).

The fibres forming the first lap 1 1 or 1 1 ' and the second lap 12, and the additional laps 16, 16' and 17, are preferably water-soluble, i.e. they consist of water- soluble fibres. These fibres are, for example, nonwoven water-soluble fibres such as PVA fibres, polysaccharide fibres, glucomannans or starches, or any other polymer or compound that is capable of forming water-soluble fibres or yarns, obtained, for example, by extrusion.

The laps 1 1 , 1 1 ' and 12 and the optional additional laps 16, 16' and 17, which are preferably made of nonwoven, generally have a basis weight of less than or equal to 60 g/m ² , or even less than or equal to 50 g/m ² and better still less than or equal to 45 g/m ² . In a variant, the basis weight of at least one layer may be greater than 60 g/m ² .

The packaging articles comprising water-soluble fibres according to the invention are preferably soluble in water or in an aqueous composition with a dissolution time of the packaging article preferably of not more than one hour.

Process for preparing the packaging article:

The envelope i) delimits or defines a cavity that is filled with an anhydrous dye composition ii) comprising at least one oxidation dye, preferably in powder or paste form, and optionally at least one anhydrous chemical oxidizing agent iii), preferably in powder or paste form, the article is then closed by folding the envelope i) on itself with its contents, followed by assembly at its periphery, for example by glueing or welding, preferably by heat-welding, or alternatively, if the article contains an envelope consisting of two laps, the dye composition ii) preferably in powder or paste form and optionally at least one chemical oxidizing agent preferably in powder form iii) are placed on the first lap, the article is closed by means of a second lap which covers the ingredients ii) and iii) placed on the first lap and which is assembled, for example, by glueing or welding at its periphery, preferably by heat-welding at its periphery, so as to obtain a hermetic article, which does not allow the powders or pastes contained in the said article to pass into the atmosphere. When the envelope and the laps comprise several water-soluble laps of nonwovens, these nonwovens may be assembled especially by heat-welding at their periphery. Preferably, the heat-welding is performed with entanglement of the fibres of the parts of the envelope to be welded. ii) at least one oxidation dye

As has been indicated previously, the dye composition is in anhydrous powder or paste form, preferably in powder form. In addition, the dye composition comprises one or more oxidation dyes, namely one or more oxidation bases optionally combined with one or more couplers.

By way of example, the oxidation bases are chosen from para- phenylenediamines, bis(phenyl)alkylenediamines, para-aminophenols, ortho- aminophenols and heterocyclic bases, and the addition salts thereof.

Among the para-phenylenediamines, examples that may be mentioned include para-phenylenediamine, para-tolylenediamine, 2-chloro-para-phenylenediamine, 2,3- dimethyl-para-phenylenediamine, 2,6-dimethyl-para-phenylenediamine, 2,6-diethyl-para- phenylenediamine, 2,5-dimethyl-para-phenylenediamine, N,N-dimethyl-para- phenylenediamine, Ν,Ν-diethyl-para-phenylenediamine, N,N-dipropyl-para- phenylenediamine, 4-amino Ν,Ν-diethyl 3-methylaniline, N,N-bis(p-hydroxyethyl)-para- phenylenediamine, 4-N,N-bis(p-hydroxyethyl)amino-2-methylaniline, 4-N,N-bis(p-hydroxyethyl)amino-2-chloroaniline, 2-p-hydroxyethyl-para- phenylenediamine, 2-fluoro-para-phenylenediamine, 2-isopropyl-para-phenylenediamine, N-(p-hydroxypropyl)-para-phenylenediamine, 2-hydroxymethyl-para-phenylenediamine, N,N-dimethyl-3-methyl-para-phenylenediamine, N-ethyl-N-(p-hydroxyethyl)-para- phenylenediamine, N-(p,y-dihydroxypropyl)-para-phenylenediamine, N-(4'-aminophenyl)- para-phenylenediamine, N-phenyl-para-phenylenediamine, 2-p-hydroxyethyloxy-para- phenylenediamine, 2-p-acetylaminoethyloxy-para-phenylenediamine, N-(p-methoxyethyl)- para-phenylene-diamine, 4-aminophenylpyrrolidine, 2-thienyl-para-phenylenediamine, 2- p-hydroxyethylamino-5-aminotoluene and 3-hydroxy-1 -(4'-aminophenyl)pyrrolidine, and the addition salts thereof with an acid.

Among the para-phenylenediamines mentioned above, para-phenylenediamine, para-tolylenediamine, 2-isopropyl-para-phenylenediamine, 2-p-hydroxyethyl-para- phenylenediamine, 2-p-hydroxyethyloxy-para-phenylene-diamine, 2,6-dimethyl-para- phenylenediamine, 2,6-diethyl-para-phenylenediamine, 2,3-dimethyl-para- phenylenediamine, N,N-bis(p-hydroxyethyl)-para-phenylenediamine, 2-chloro-para- phenylenediamine and 2-p-acetylaminoethyloxy-para-phenylenediamine, and the addition salts thereof with an acid are particularly preferred.

Among the bis(phenyl)alkylenediamines, examples that may be mentioned include

N,N'-bis(3-hydroxyethyl)-N,N'-bis(4'-aminophenyl)1 ,3-diaminopropanol, N,N'-bis(3- hydroxyethyl)-N,N'-bis(4'-aminophenyl)ethylenediamine, N,N'-bis(4- aminophenyl)tetramethylenediamine, N,N'-bis(3-hydroxyethyl)-N,N'-bis(4- aminophenyl)tetramethylenediamine, N,N'-bis(4- methylaminophenyl)tetramethylenediamine, N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'- methylphenyl)ethylenediamine and 1 ,8-bis(2,5-diaminophenoxy)-3,6-dioxaoctane, and the addition salts thereof.

Among the para-aminophenols, examples that may be mentioned include para- aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4-amino-3-chlorophenol, 4-amino-3-hydroxymethylphenol, 4-amino-2-methylphenol, 4-amino-2- hydroxymethylphenol, 4-amino-2-methoxymethylphenol, 4-amino-2-aminomethylphenol, 4-amino-2-(3-hydroxyethylaminomethyl)phenol and 4-amino-2-fluorophenol, and the addition salts thereof with an acid.

Among the ortho-aminophenols, examples that may be mentioned include 2- aminophenol, 2-amino-5-methylphenol, 2-amino-6-methylphenol and 5-acetamido-2- aminophenol, and the addition salts thereof. Among the heterocyclic bases, examples that may be mentioned include pyridine derivatives, pyrimidine derivatives and pyrazole derivatives.

Among the pyridine derivatives, examples that may be mentioned include the compounds described in patents GB 1 026 978 and GB 1 153 196, for instance 2,5- diaminopyridine, 2-(4-methoxyphenyl)amino-3-aminopyridine and 3,4-diaminopyridine, and the addition salts thereof.

Other pyridine oxidation bases that are useful in the present invention are the 3- aminopyrazolo[1 ,5-a]pyridine oxidation bases or the addition salts thereof, described, for example, in patent application FR 2 801 308. Examples that may be mentioned include pyrazolo[1 ,5-a]pyrid-3-ylamine, 2-acetylaminopyrazolo[1 ,5-a]pyrid-3-ylamine, 2- (morpholin-4-yl)pyrazolo[1 ,5-a]pyrid-3-ylamine, 3-aminopyrazolo[1 ,5-a]pyridine-2- carboxylic acid, 2-methoxypyrazolo[1 ,5-a]pyrid-3-ylamine, (3-aminopyrazolo[1 ,5- a]pyrid-7-yl)methanol, 2-(3-aminopyrazolo[1 ,5-a]pyrid-5-yl)ethanol, 2-(3- aminopyrazolo[1 ,5-a]pyrid-7-yl)ethanol, (3-aminopyrazolo[1 ,5-a]pyrid-2-yl)methanol, 3,6-diaminopyrazolo[1 ,5-a]pyridine, 3,4-diaminopyrazolo[1 ,5-a]pyridine, pyrazolo[1 ,5- a]pyridine-3,7-diamine, 7-(morpholin-4-yl)pyrazolo[1 ,5-a]pyrid-3-ylamine, pyrazolo[1 ,5- a]pyridine-3,5-diamine, 5-(morpholin-4-yl)pyrazolo[1 ,5-a]pyrid-3-ylamine, 2-[(3- aminopyrazolo[1 ,5-a]pyrid-5-yl)(2-hydroxyethyl)amino]ethanol, 2-[(3- aminopyrazolo[1 ,5-a]pyrid-7-yl)(2-hydroxyethyl)amino]ethanol, 3-aminopyrazolo[1 ,5- a]pyridin-5-ol, 3-aminopyrazolo[1 ,5-a]pyridin-4-ol, 3-aminopyrazolo[1 ,5-a]pyridin-6-ol, 3-aminopyrazolo[1 ,5-a]pyridin-7-ol, 2-3-hydroxyethoxy-3-aminopyrazolo[1 ,5-a]pyridine; 2-(4-dimethylpyperazinium-1 -yl)-3-aminopyrazolo[1 ,5-a]pyridine; and also the addition salts thereof. More preferentially, 3-aminopyrazolo[1 ,5-a]pyridines substituted in position 2 with a) a (di)(Ci-C ₆ )(alkyl)amino group, the alkyl groups possibly being substituted with one or more hydroxyl, amino or imidazolium groups; b) a cationic or non-cationic 5- to 7-membered heterocycloalkyl comprising from 1 to 3 heteroatoms, optionally substituted with one or more (CrC ₆ )alkyl groups such as di(Ci- C ₄ )alkylpiperazinium; c) a (CrC ₆ )alkoxy group optionally substituted with one or more hydroxyl groups such as β-hydroxyalkoxy, and also the addition salts thereof.

Among the pyrimidine derivatives, mention may be made of the compounds described, for example, in patents DE 2359399, JP 88169571 , JP 05-63124 and EP 0 770 375 or patent application WO 96/15765, such as 2,4,5,6-tetraaminopyrimidine, 4- hydroxy-2,5,6-triaminopyrimidine, 2-hydroxy-4,5,6-triaminopyrimidine, 2,4-dihydroxy- 5,6-diaminopyrimidine, 2,5,6-triaminopyrimidine and the addition salts thereof, and the tautomeric forms thereof, when a tautomeric equilibrium exists. Among the pyrazole derivatives, mention may be made of the compounds described in the patents DE 3843892, DE 4133957 and patent applications WO

94/08969, WO 94/08970, FR-A-2 733 749 and DE 195 43 988, such as 4,5-diamino-1 - methylpyrazole, 4,5-diamino-1 -(3-hydroxyethyl)pyrazole, 3,4-diaminopyrazole, 4,5- diamino-1 -(4'-chlorobenzyl)pyrazole, 4,5-diamino-1 ,3-dimethylpyrazole, 4,5-diamino-3- methyl-1 -phenylpyrazole, 4,5-diamino-1 -methyl-3-phenylpyrazole, 4-amino-1 ,3- dimethyl-5-hydrazinopyrazole, 1 -benzyl-4,5-diamino-3-methylpyrazole, 4,5-diamino-3- tert-butyl-1 -methylpyrazole, 4,5-diamino-1 -tert-butyl-3-methylpyrazole, 4,5-diamino-1 - (3-hydroxyethyl)-3-methylpyrazole, 4,5-diamino-1 -ethyl-3-methylpyrazole, 4,5-diamino- 1 -ethyl-3-(4'-methoxyphenyl)pyrazole, 4,5-diamino-1 -ethyl-3-hydroxymethylpyrazole, 4,5-diamino-3-hydroxymethyl-1 -methylpyrazole, 4,5-diamino-3-hydroxymethyl-1 - isopropylpyrazole, 4,5-diamino-3-methyl-1 -isopropylpyrazole, 4-amino-5-(2'- aminoethyl)amino-1 ,3-dimethylpyrazole, 3,4,5-triaminopyrazole, 1 -methyl-3,4,5- triaminopyrazole, 3,5-diamino-1 -methyl-4-methylaminopyrazole, 3,5-diamino-4-(3- hydroxyethyl)amino-1 -methylpyrazole, and the addition salts thereof. 4,5-Diamino-1 -(3- methoxyethyl)pyrazole may also be used.

The oxidation base(s) present in the composition of the invention are generally present in an amount ranging from 0.001 % to 20% and preferably ranging from 0.005% to 6% by weight approximately relative to the total weight of the dye composition.

If the composition contains at least one oxidation base, the composition according to the invention preferably contains one or more couplers that are conventionally used for dyeing keratin fibres. Among these couplers, mention may be made especially of meta- phenylenediamines, meta-aminophenols, meta-diphenols, naphthalene-based couplers and heterocyclic couplers, and also the addition salts thereof.

Examples that may be mentioned include 1 ,3-dihydroxybenzene, 1 ,3-dihydroxy-2- methylbenzene, 4-chloro-1 ,3-dihydroxybenzene, 2,4-diamino-1 -(3- hydroxyethyloxy)benzene, 2-amino-4-(3-hydroxyethylamino)-1 -methoxybenzene, 1 ,3- diaminobenzene, 1 ,3-bis(2,4-diaminophenoxy)propane, 3-ureidoaniline, 3-ureido-1 - dimethylaminobenzene, sesamol, 1 -3-hydroxyethylamino-3,4-methylenedioxybenzene, o naphthol, 2-methyl-1 -naphthol, 6-hydroxyindole, 4-hydroxyindole, 4-hydroxy-N- methylindole, 2-amino-3-hydroxypyridine, 6-hydroxybenzomorpholine, 3,5-diamino-2,6- dimethoxypyridine, 1 -N-(3-hydroxyethyl)amino-3,4-methylenedioxybenzene, 2,6-bis(3- hydroxyethylamino)toluene, 6-hydroxyindoline, 2,6-dihydroxy-4-methylpyridine, 1 -H-3- methylpyrazol-5-one, 1 -phenyl-3-methylpyrazol-5-one, 2,6-dimethylpyrazolo[1 ,5-b]-1 ,2,4- triazole, 2,6-dimethyl[3,2-c]-1 ,2,4-triazole and 6-methylpyrazolo[1 ,5-a]benzimidazole, the addition salts thereof with an acid, and mixtures thereof. In the composition of the present invention, the coupler(s) are generally present in an amount ranging from 0.001 % to 20% by weight approximately, and preferably from 0.005% to 6% by weight relative to the total weight of the dye composition.

In general, the addition salts of the oxidation bases and of the couplers that may be used in the context of the invention are in particular chosen from addition salts with an acid such as hydrochlorides, hydrobromides, sulfates, citrates, succinates, tartrates, lactates, tosylates, benzenesulfonates, phosphates and acetates.

According to one particular embodiment of the invention, the packaging article also contains one or more natural or synthetic direct dyes, chosen from ionic and nonionic species, preferably cationic or nonionic species, in addition to the oxidation dye(s), the said direct dyes being in powder or anhydrous paste form.

According to a preferred embodiment, the direct dye(s) are mixed with the oxidation dye(s) in the same cavity.

According to another variant, the direct dye(s) are in the packaging article separated from the oxidation dye(s) by one or more laps as defined previously defining a cavity in which the said direct dye(s) are housed. According to one variant, the direct dye(s) are found mixed with the chemical oxidizing agents separated from the oxidation dyes by a lap.

As examples of direct dyes that are suitable for use, mention may be made of direct dyes of the following types: azo direct dyes; (poly)methines such as cyanines, hemicyanines and styryls; carbonyls; azines; nitro(hetero)aryls; tri(hetero)arylmethanes; porphyrins; phthalocyanines and natural direct dyes, alone or as mixtures.

Among the natural direct dyes that may be used according to the invention, mention may be made of lawsone, juglone, alizarin, purpurin, carminic acid, kermesic acid, purpurogallin, protocatechaldehyde, indigo, isatin, curcumin, spinulosin, apigenidin and orceins. Use may also be made of extracts or decoctions containing these natural dyes and especially henna-based poultices or extracts.

When they are present, the direct dye(s) more particularly represent from 0.001 % to 10% by weight relative to the total weight and preferably from 0.005% to 6% by weight relative to the total weight of the composition(s) contained in the packaging article.

According to one embodiment of the invention, the packaging article is free of direct dye. iii) oxidizing agent:

The packaging article of the invention may comprise one or more anhydrous oxidizing agents iii), preferably in powder or paste form.

More particularly, the anhydrous chemical oxidizing agent(s) iii) are chosen from peroxygenated salts, for instance persulfates, perborates, peracids and precursors thereof, percarbonates of alkali metals or alkaline-earth metals, such as sodium carbonate peroxide also known as sodium percarbonate and peracids and precursors thereof; peroxygenated salts, for instance persulfates, perborates, peracids and precursors thereof, percarbonates of alkali metals or alkaline-earth metals such as sodium carbonate peroxide also known as sodium percarbonate and peracids and precursors thereof: alkali metal bromates or ferricyanides, hydrogen peroxide-generating solid chemical oxidizing agents such as urea peroxide and polymeric complexes that can release hydrogen peroxide, especially those comprising a heterocyclic vinyl monomer such as polyvinylpyrrolidone/H ₂ 02 complexes, in particular in the form of powders; oxidases that produce hydrogen peroxide in the presence of a suitable substrate (for example glucose in the case of glucose oxidase or uric acid with uricase).

According to a particular embodiment, the oxidizing agent iii) is chosen from complexes of hydrogen peroxide and of polymer containing as monomer at least one heterocyclic vinyl monomer.

More particularly, the heterocyclic vinyl monomer is chosen from monomers comprising a 4- to 6-membered heterocycle, optionally fused to a benzene ring and optionally comprising from 1 to 4 identical or different endocyclic heteroatoms; the number of endocyclic heteroatoms being less than the number of ring members of the heterocycle. Preferably, the number of endocyclic heteroatoms is 1 or 2.

More particularly, the heteroatom(s) are chosen from sulfur, oxygen and nitrogen, preferably from nitrogen and oxygen. In accordance with an even more advantageous embodiment of the invention, the monomer comprises at least one endocyclic nitrogen atom.

The vinyl heterocycle may optionally be substituted with one or more Ci-C ₄ and preferably Ci-C ₂ alkyl groups.

Preferably, the heterocyclic monomer is chosen from /V-vinyl monomers.

Among the monomers that may be envisaged, mention may be made of the following optionally substituted monomers: N-vinylpyrrolidone, vinylcaprolactam, N- vinylpiperidone, N-vinyl-3-morpholine, N-vinyl-4-oxazolinone, 2-vinylpyridine, 4- vinylpyridine, 2-vinylquinoline, 1 -vinylimidazole and 1 -vinylcarbazole. Preferably, the monomer is optionally substituted N-vinylpyrrolidine.

According to a particularly advantageous embodiment of the invention, the polymer is a homopolymer.

However, it is not excluded to use a copolymer. In such a case, the comonomer(s) are chosen from vinyl acetate, (meth)acrylic acids, (meth)acrylamides and C C ₄ alkyl esters of (meth)acrylic acid, which may be substituted or unsubstituted. The polymer participating in this complex is preferably water-soluble. It may have variable average molecular weights, preferably between 10 ³ and 3x10 ⁶ g/mol and preferably between 10 ³ and 2x10 ⁶ g/mol. It is also possible to use mixtures of such polymers.

Advantageously, the said complex comprises from 10% to 30% by weight, more particularly from 13% to 25% by weight and preferably from 18% to 22% by weight of hydrogen peroxide relative to the total weight of the complex.

According to an even more advantageous variant of the invention, in this complex, the mole ratio between the heterocyclic vinyl monomer(s) and the hydrogen peroxide ranges from 0.5 to 2 and preferably from 0.5 to 1 .

This complex is advantageously in the form of a substantially anhydrous powder.

Complexes of this type are especially described in US 5 008 106, US 5 077 047, EP 832 846, EP 714 919, DE 4344131 and DE 195 45 380 and the other polymer complexes described in US 5 008 093, US 3 376 1 10 and US 5 183 901.

Examples of complexes that may be mentioned include products such as

Peroxydone K-30, Peroxydone K-90 and Peroxydone XL-10 and also complexes formed with hydrogen peroxide and one of the following polymers such as Plasdone K-17, Plasdone K-25, Plasdone K-29/32, Plasdone K-90, Polyplasdone INF-10, Polyplasdone XL-10, Polyplasdone XL, Plasdone S-630, Styleze 2000 Terpolymer and the series of Ganex copolymers, sold by the company ISP.

According to a particular embodiment of the invention, the packaging article contains one or more solid chemical oxidizing agents chosen from a) urea peroxide, b) polymer complexes that can release hydrogen peroxide, chosen from polyvinylpyrrolidone/H ₂ 0 ₂ complexes; c) perborates and d) percarbonates; preferably, the packaging article contains as chemical oxidizing agents one or more percarbonates.

The packaging article according to the invention advantageously contains from 0.1 % to 70% by weight and preferably from 1 % to 55% by weight of chemical oxidizing agent relative to the total weight of the packaging article.

According to one variant, the packaging article of the invention does not comprise any oxidizing agent.

According to this variant, if it is necessary to perform the colouring in the presence of an oxidizing agent, then the packaging article may be either first dissolved in an aqueous composition to which is then added at least one chemical oxidizing agent, or directly dissolved in an oxidizing composition comprising at least one chemical oxidizing agent. In this case, the chemical oxidizing agent may be an oxidizing agent such as hydrogen peroxide.

The oxidizing agent may also be added to the aqueous composition in the form of a packaging article as defined previously, but not containing any oxidation dyes. Other ingredients The packaging article may contain other ingredients. The packaging article may contain iv) one or more alkaline agents. The alkaline agent(s) may be in the packaging article either combined with the oxidation dyes, or separated from the dyes by one or more laps as defined previously.

The alkaline agent(s) are more particularly chosen from silicates and metasilicates such as alkali metal metasilicates, alkali metal or alkaline-earth metal carbonates or hydrogen carbonates, such as lithium, sodium, potassium, magnesium, calcium or barium, and mixtures thereof.

Preferably, the alkaline agent(s) are chosen from alkali metal silicates, metasilicates and carbonates, and mixtures thereof.

The concentration of alkaline agents advantageously represents from 0.01 % to

40% by weight and preferably from 0.1 % to 30% by weight relative to the total weight of the composition(s) contained in the packaging article.

According to a particular embodiment of the invention, the packaging article contains v) one or more ammonium salts. The ammonium salt(s) that may be in the packaging article are either combined with the oxidation dyes, or combined with the direct dyes, or separated from the dyes by one or more water-soluble laps as defined previously defining a cavity in which the said salt(s) are housed.

According to a particular variant, the packaging article comprises one or more ammonium salts chosen from ammonium halides such as ammonium chloride, ammonium sulfate, ammonium phosphate and ammonium nitrate.

In accordance with an even more advantageous embodiment of the invention, the ammonium salt is ammonium chloride or ammonium sulfate.

The concentration of ammonium salt(s), if they are present, is advantageously between 0.01 % and 40% by weight relative to the total weight of the composition(s) contained in the packaging article, and preferably from 0.1 % to 30% by weight relative to the total weight of the composition(s) contained in the packaging article.

When the dye composition is in paste form, it also comprises vi) one or more liquid fatty substances.

For the purposes of the present invention, the term "liquid" means any compound that is capable of flowing at room temperature, generally between 15°C and 40°C, and at atmospheric pressure, under the action of its own weight.

Examples of liquid fatty substances that may be mentioned include the polydecenes of formula Cio _n H[ ₍ 20n)+2] in which n ranges from 3 to 9 and preferably from 3 to 7, esters and in particular esters of fatty alcohols or of fatty acids, sugar esters or diesters of C12- C ₂ 4 fatty acids, cyclic esters, cyclic ethers, silicone oils, mineral oils, plant oils or animal oils, or mixtures thereof.

Preferably, the liquid fatty substance(s) are chosen from the polydecenes of formula Cio _n H[(20n)+2] in which n ranges from 3 to 9 and preferably from 3 to 7, esters of fatty alcohols or of fatty acids, liquid petroleum jelly and liquid paraffin, and mixtures thereof.

Preferably, one or more mineral oils may be in the packaging article, in particular combined with the oxidation dye(s), for instance liquid paraffin or petroleum jelly, preferably petroleum jelly.

In the composition(s) contained in the packaging article, the content of liquid fatty substance(s), if they are present, advantageously ranges from 10% to 50% by weight relative to the weight of the composition(s) contained in the packaging article, and preferably from 20% to 50% by weight relative to the weight of the composition(s) contained in the packaging article.

The anhydrous composition according to the invention in paste form comprising a liquid fatty substance may be advantageously prepared by dispersing, under mechanical action, all of the compounds that are in powder form in the liquid fatty substance, in which the other liquid compounds of the composition have been predispersed or premixed.

The paste may also be prepared by extrusion, by introducing the liquid and solid phases of the composition into an extruder and then mixing them at a temperature below 25°C using a co-rotating twin-screw system composed of transportation and blending elements.

According to a particular embodiment, the packaging article of the invention comprises vii) one or more thickening polymers, these polymers possibly being in the said article either with the oxidation dye(s) or separated from the other ingredients by one or more water-soluble laps as defined previously.

Advantageously, the thickening polymers are chosen from the following polymers: (a) nonionic amphiphilic polymers comprising at least one fatty chain and at least one hydrophilic unit;

(b) anionic amphiphilic polymers comprising at least one hydrophilic unit and at least one fatty-chain unit;

(c) crosslinked acrylic acid homopolymers;

(d) crosslinked homopolymers of 2-acrylamido-2-methylpropanesulfonic acid, and crosslinked acrylamide copolymers thereof which are partially or totally neutralized; (e) ammonium acrylate homopolymers or copolymers of ammonium acrylate and of acrylamide;

(f) dimethylaminoethyl methacrylate homopolymers quaternized with methyl chloride or dimethylaminoethyl methacrylate copolymers quaternized with methyl chloride and acrylamide; (g) polysaccharides such as:

(g1 ) scleroglucan gums (biopolysaccharide of microbial origin);

(g2) gums derived from plant exudates, such as gum arabic, ghatti gum, karaya gum or gum tragacanth; and

(g3) celluloses and derivatives;

(g4) guar gums and derivatives; or

(g5) starches or derivatives.

It should be noted that, in the case of the present invention, the thickening polymers act on the viscosity of the ready-to-use composition, i.e. the composition resulting from the mixing of the packaging article according to the invention with an aqueous composition.

According to the invention, amphiphilic polymers are more particularly hydrophilic polymers that are capable, in the medium of the composition, and more particularly an aqueous medium, of reversibly combining with each other or with other molecules.

Their chemical structure more particularly comprises at least one hydrophilic region and at least one hydrophobic region. The term "hydrophobic group" means a radical or polymer bearing a saturated or unsaturated, linear or branched hydrocarbon-based chain, comprising at least 8 carbon atoms, preferably at least 10 carbon atoms, preferably from 10 to 30 carbon atoms, in particular from 12 to 30 carbon atoms and more preferentially from 18 to 30 carbon atoms. Preferentially, the hydrocarbon-based group is derived from a monofunctional compound. By way of example, the hydrophobic group may be derived from a fatty alcohol such as stearyl alcohol, dodecyl alcohol or decyl alcohol. It may also denote a hydrocarbon-based polymer, for instance polybutadiene.

The thickening polymers are preferably used in an amount that may range from 0.01 % to 15% by weight relative to the weight of the composition(s) contained in the packaging article, and preferably from 0.1 % to 10% by weight relative to the weight of the composition(s) contained in the packaging article.

According to a particular embodiment, the packaging article of the invention comprises viii) one or more surfactants. These surfactants may be in the said article either with the oxidation dye(s), or separated from the other ingredients by one or more water-soluble laps as defined previously, which define a cavity in which the surfactant(s) are housed. Preferably, viii) is found with the oxidation dye(s) in the packaging article. For the purposes of the present invention, the term "surfactant" means an agent comprising at least one hydrophilic group and at least one lipophilic group in its structure, and which is preferably capable of reducing the surface tension of water, and comprising in its structure, as optional repeating units, only alkylene oxide units and/or sugar units and/or siloxane units. Preferably, the lipophilic group is a fatty chain comprising from 8 to 30 carbon atoms. This or these surfactants may be chosen from anionic, amphoteric, nonionic and cationic surfactants, or mixtures thereof. More particularly, the surfactants are chosen from nonionic and anionic surfactants.

The surfactants that are suitable for implementing the present invention are especially the following:

(a) Anionic surfactant(s):

The term "anionic surfactant" means a surfactant comprising, as ionic or ionizable groups, only anionic groups. These anionic groups are preferably chosen from the groups -C(0)OH, -C(0)0-, -SO ₃ H, -S(0) ₂ 0 ^" , -OS(0) ₂ OH, -OS(0) ₂ 0 ^" , -P(0)OH ₂ , -P(0) ₂ 0 ^" , - P(0)0 ₂ ^" , -P(OH) ₂ , =P(0)OH, -P(OH)0 ^" , =P(0)0 ^" , =POH and =PO ^" , the anionic parts comprising a cationic counterion such as those derived from an alkali metal, an alkaline- earth metal, an amine or an ammonium.

As examples of anionic surfactants that may be used in the composition according to the invention, mention may be made of alkyl sulfates, alkyl ether sulfates, alkylamido ether sulfates, alkylaryl polyether sulfates, monoglyceride sulfates, alkylsulfonates, alkylamidesulfonates, alkylarylsulfonates, oolefin sulfonates, paraffin sulfonates, alkyl sulfosuccinates, alkyl ether sulfosuccinates, alkylamide sulfosuccinates, alkyl sulfoacetates, acylsarcosinates, acylglutamates, alkyl sulfosuccinamates, acylisethionates and N-acyltaurates, polyglycoside polycarboxylic acid and alkyl monoester salts, acyl lactylates, salts of D-galactoside uronic acids, salts of alkyl ether carboxylic acids, salts of alkylaryl ether carboxylic acids, salts of alkylamido ether carboxylic acids; and the corresponding non-salified forms of all these compounds; the alkyl and acyl groups of all these compounds comprising from 6 to 24 carbon atoms and the aryl group denoting a phenyl group.

These compounds can be oxyethylenated and then preferably comprise from 1 to

50 ethylene oxide units.

The salts of C ₆ -C ₂₄ alkyl monoesters of polyglycoside-polycarboxylic acids can be chosen from C ₆ -C ₂₄ alkyl polyglycoside-citrates, C ₆ -C ₂₄ alkyl polyglycoside-tartrates and C ₆ -C ₂₄ alkyl polyglycoside-sulfosuccinates.

When the anionic surfactant(s) are in salt form, they may be chosen from alkali metal salts such as the sodium or potassium salt and preferably the sodium salt, ammonium salts, amine salts and in particular amino alcohol salts or alkaline-earth metal salts such as the magnesium salts.

Examples of amino alcohol salts that may especially be mentioned include monoethanolamine, diethanolamine and triethanolamine salts, monoisopropanolamine, diisopropanolamine or triisopropanolamine salts, 2-amino-2-methyl-1 -propanol salts, 2- amino-2-methyl-1 ,3-propanediol salts and tris(hydroxymethyl)aminomethane salts.

Use is preferably made of alkali metal or alkaline-earth metal salts, and in particular sodium or magnesium salts. Among the anionic surfactants mentioned, use is preferably made of (C ₆ -C ₂ 4)alkyl sulfates, (C ₆ -C ₂ 4)alkyl ether sulfates comprising from 2 to 50 ethylene oxide units, especially in the form of alkali metal, ammonium, amino alcohol and alkaline-earth metal salts, or a mixture of these compounds.

In particular, it is preferred to use (Ci ₂ -C ₂ o)alkyl sulfates, (Ci ₂ -C ₂₀ )alkyl ether sulfates comprising from 2 to 20 ethylene oxide units, especially in the form of alkali metal, ammonium, amino alcohol and alkaline-earth metal salts, or a mixture of these compounds. Better still, it is preferred to use sodium lauryl ether sulfate, in particular those containing 2.2 mol of ethylene oxide, more preferentially (Ci ₂ -C ₂₀ )alkyl sulfates such as an alkali metal lauryl sulfate such as sodium lauryl sulfate.

(b) Amphoteric surfactant(s):

The amphoteric or zwitterionic surfactant(s) of the invention are preferably non- silicone, and are especially derivatives of optionally quaternized aliphatic secondary or tertiary amines, in which derivatives the aliphatic group is a linear or branched chain comprising from 8 to 22 carbon atoms, the said amine derivatives containing at least one anionic group, for instance a carboxylate, sulfonate, sulfate, phosphate or phosphonate group. Mention may be made in particular of (C ₈ -C ₂₀ )alkyl betaines, sulfobetaines, (C ₈ - C ₂ o)alkylamido(C ₃ -C ₈ )alkyl betaines and (C ₈ -C ₂ o)alkylamido(C6-C ₈ )alkyl sulfobetaines.

Among the amphoteric or zwitterionic surfactants mentioned above, use is preferably made of (C ₈ -C ₂₀ )alkyl betaines such as cocoyl betaine, and (C ₈ - C ₂₀ )alkylamido(C ₃ -C ₈ )alkyl betaines such as cocamidopropyl betaine, and mixtures thereof. More preferably, the amphoteric or zwitterionic surfactant(s) are chosen from cocamidopropyl betaine and cocoyl betaine.

(c) Cationic surfactant(s):

The cationic surfactant(s) that may be used in the composition according to the invention comprise, for example, optionally polyoxyalkylenated primary, secondary or tertiary fatty amine salts, quaternary ammonium salts, and mixtures thereof.

Among the cationic surfactants that may be present in the composition according to the invention, it is more particularly preferred to choose from cetyltrimethylammonium, behenyltrimethylammonium and dipalmitoylethylhydroxyethylmethylammonium salts, and mixtures thereof, and more particularly behenyltrimethylammonium chloride, cetyltrimethylammonium chloride and dipalmitoylethylhydroxyethylammonium methosulfate, and mixtures thereof.

(d) Nonionic surfactant(s):

Examples of nonionic surfactants that may be used in the composition used according to the invention are described, for example, in the Handbook of Surfactants by M.R. Porter, published by Blackie & Son (Glasgow and London), 1991 , pp. 1 16-178.

Examples of nonionic surfactants that may be mentioned include: - oxyalkylenated (C ₈ -C ₂ 4)alkylphenols;

- saturated or unsaturated, linear or branched, oxyalkylenated or glycerolated C ₈ -C ₃ o alcohols;

- saturated or unsaturated, linear or branched, oxyalkylenated C ₈ -C ₃ o amides;

- esters of saturated or unsaturated, linear or branched, C ₈ -C ₃ o acids and of polyethylene glycols;

- polyoxyethylenated esters of saturated or unsaturated, linear or branched, C ₈ -C ₃ o acids and of sorbitol;

- fatty acid esters of sucrose;

- (C ₈ -C ₃₀ )alkylpolyglycosides, (C ₈ -C ₃₀ )alkenylpolyglycosides, optionally oxyalkylenated (0 to 10 oxyalkylene units) and comprising 1 to 15 glucose units, (C ₈ -C ₃₀ )alkylglucoside esters;

- saturated or unsaturated, oxyethylenated plant oils;

- condensates of ethylene oxide and/or of propylene oxide, inter alia, alone or as mixtures;

- N-(C ₈ -C ₃₀ )alkylglucamine and N-(C ₈ -C ₃₀ )acylmethylglucamine derivatives;

- aldobionamides;

- amine oxides;

- oxyethylenated and/or oxypropylenated silicones;

the surfactants containing a number of moles of ethylene oxide and/or of propylene oxide ranging advantageously from 1 to 100, more particularly from 2 to 100, preferably from 2 to 50 and more advantageously from 2 to 30. Advantageously, the nonionic surfactants do not comprise any oxypropylene units.

In accordance with a preferred embodiment of the invention, the nonionic surfactants are chosen from oxyethylenated C ₈ -C ₃₀ alcohols comprising from 1 to 100 mol and more particularly from 2 to 100 mol of ethylene oxide; polyoxyethylenated esters of saturated or unsaturated, linear or branched C ₈ -C ₃₀ acids and of sorbitan comprising from 1 to 100 mol and better still from 2 to 100 mol of ethylene oxide.

As examples of monoglycerolated or polyglycerolated nonionic surfactants, monoglycerolated or polyglycerolated C ₈ -C ₄ o alcohols are preferably used.

In particular, the monoglycerolated or polyglycerolated C ₈ -C ₄ o alcohols preferably correspond to formula (A8) below:

R ₂₉ 0-[CH ₂ -CH(CH ₂ OH)-0] _m -H (A8)

in which formula (A8):

- R ₂₉ represents a linear or branched C ₈ -C ₄ o and preferably C ₈ -C ₃₀ alkyl or alkenyl radical; and

- m represents a number ranging from 1 to 30 and preferably from 1 to 10.

As examples of compounds of formula (A8) that are suitable within the context of the invention, mention may be made of lauryl alcohol containing 4 mol of glycerol (INCI name: Polyglyceryl-4 Lauryl Ether), lauryl alcohol comprising 1 .5 mol of glycerol, oleyl alcohol comprising 4 mol of glycerol (INCI name: Polyglyceryl-4 Oleyl Ether), oleyl alcohol containing 2 mol of glycerol (INCI name: Polyglyceryl-2 Oleyl Ether), cetearyl alcohol containing 2 mol of glycerol, cetearyl alcohol containing 6 mol of glycerol, oleocetyl alcohol containing 6 mol of glycerol, and octadecanol containing 6 mol of glycerol.

The alcohol of formula (A8) may represent a mixture of alcohols in the same way that the value of m represents a statistical value, which means that, in a commercial product, several species of polyglycerolated fatty alcohols may coexist in the form of a mixture.

Among the monoglycerolated or polyglycerolated alcohols, it is more particularly preferred to use the C ₈ /Ci ₀ alcohol containing 1 mol of glycerol, the C10/C12 alcohol containing 1 mol of glycerol and the C12 alcohol containing 1.5 mol of glycerol.

Preferentially, the nonionic surfactant used in the process of the invention in the composition is a monooxyalkylenated or polyoxyalkylenated, particularly monooxyethylenated or polyoxyethylenated, or monooxypropylenated or polyoxypropylenated, nonionic surfactant, or a combination thereof, more particularly monooxyethylenated or polyoxyethylenated, monoglycerolated or polyglycerolated surfactants and alkylpolyglucosides.

Even more preferentially, the nonionic surfactants are chosen from polyoxyethylenated sorbitan esters, polyoxyethylenated fatty alcohols and alkylpolyglucosides, and mixtures thereof.

The surfactant(s) when they are present, more particularly represent from 0.01 % and 60% by weight relative to the total weight of the composition(s) included in the packaging article, preferably between 0.5% and 30% by weight and even more preferentially between 1 % and 20% by weight of the composition(s) included in the packaging article.

According to a particular embodiment, the packaging article of the invention comprises ix) one or more cationic or amphoteric substantive polymers. These polymers may be found in the said article either with the oxidation dye(s), or separated from the other ingredients by one or more water-soluble laps as defined previously, which define a cavity in which the substantive polymer(s) are housed. Preferably, the agents ix) are found with the oxidation dye(s) in the packaging article. More particularly, the substantive polymers are chosen from cationic polymers.

The substantive nature (i.e. the capacity for deposition onto the hair) of the polymers is conventionally determined using the test described by Richard J. Crawford, Journal of the Society of Cosmetic Chemists, 1980, 31 - (5) - pages 273 to 278 (detection with Red 80 acid dye).

These substantive polymers are especially described in the literature in patent application EP-A-0 557 203. Among the substantive polymers of the dimethyldiallylammonium halide homopolymer or copolymer type that may be used according to the invention, mention may be made in particular of:

- diallyldimethylammonium chloride polymers such as Polyquaternium-6;

- the copolymers of diallyldimethylammonium chloride and of acrylic acid such as that with proportions (80/20 by weight) sold under the name Merquat 280 Dry by the company Calgon;

- copolymers of dimethyldiallylammonium chloride and of acrylamide.

Among the substantive polymers of the methacryloyloxyethyltrimethylammonium halide polymer type that may be used according to the invention, mention may be made in particular of the products that are known in the CTFA dictionary (5th edition, 1993) as Polyquaternium 37, Polyquaternium 32 and Polyquaternium 35, which correspond respectively, as regards Polyquaternium 37, to crosslinked poly(methacryloyloxyethyltrimethylammonium chloride), in dispersion at 50% in mineral oil, and sold under the name Salcare SC95 by the company Allied Colloids; as regards Polyquaternium 32, to the crosslinked copolymer of acrylamide and methacryloyloxyethyltrimethylammonium chloride (20/80 by weight), in dispersion at 50% in mineral oil, and sold under the name Salcare SC92 by the company Allied Colloids; and as regards Polyquaternium 35, to the methosulfate of the methacryloyloxyethyltrimethylammonium/methacryloyloxyethyldi methylacetylammonium copolymer.

The substantive polymers of the quaternary polyammonium type that may be used according to the invention are as follows:

- polymers consisting of repeating units corresponding to formula (a) below:

-(CH ₃ )2N ⁺ -(CH2)3-(CH3)2N ⁺ -(CH2)6-, 2X ^" with X ^" , which may be identical or different, representing an anionic counterion as defined previously, in particular a halide such as CI ^" , these polymers being prepared and described in French patent 2 270 846; preference is given to the polymers with repeating units of formula (a) whose molecular weight, determined by gel permeation chromatography, is between 9500 and 9900;

- polymers consisting of repeating units corresponding to formula (β) below:

-(CH3)2N ⁺ -(CH2)3-(CH3)2N ⁺ -(CH ₂ )3- 2X ^" with X ^" as defined for (a), these polymers being prepared and described in French patent 2 270 846; preference is given to the polymers with repeating units of formula (β) whose molecular weight, determined by gel permeation chromatography, is about 1200;

- polymers consisting of repeating units corresponding to formula (γ) below:

-(CH3)2N ⁺ -(CH2)p-N(H)-C(0)-G-N(H)-(CH2)p-(CH3)2N ⁺ -(CH2)2-0-(CH ₂ )2- _! 2X ^" in which p denotes an integer ranging from 1 to 6 approximately, G may represent a bond or a group -(CH ₂ ) _r -C(0)- in which r denotes an integer equal to 4 or 7, these polymers being prepared and described in patents US 4 157 388, 4 390 689, 4 702 906 and 4 719 282; preference is given to the polymers with repeating units of formula (γ) whose molecular weight is less than 100 000 and preferably less than or equal to 50 000.

The packaging article of the invention may also comprise other additives conventionally used in cosmetics.

The packaging article may thus comprise fillers such as clays; binders such as vinylpyrrolidone; lubricants such as polyol stearates or alkali metal or alkaline-earth metal stearates; hydrophilic or hydrophobic silicas; pigments; matt-effect agents or opacifiers such as titanium oxides; antioxidants such as erythorbic acid; reducing agents such as sodium metabisulfite; penetrants or sequestrants such as ethylenediaminetetraacetic acid or salts thereof; moisture absorbers such as amorphous silicas, certain polyacrylates that are crosslinked or modified with hydrophobic groups, for instance the products Luquasorb 1010 from BASF, Polytrap 6603 Adsorber from Amcol; buffers; dispersants; film-forming agents; preserving agents; vitamins; fragrances; ceramides; conditioning agents other than the substantive polymers ix) and the cationic surfactants mentioned above.

The composition in accordance with the invention may also comprise agents for controlling the release of oxygen, such as magnesium carbonate or magnesium oxide.

The additives and the oxygen-release control agents as defined previously may be present in an amount, for each of them, of between 0.01 % and 40% by weight and preferably between 0.1 % and 30% by weight relative to the total weight of the composition.

Dyeing process

Another subject of the invention is a process for dyeing keratin fibres, especially human keratin fibres such as the hair, comprising the following steps: i) mixing the packaging article as defined previously with a composition that is capable of dissolving the envelope of the packaging article, ii) applying the resulting composition to the keratin fibres, iii) leaving the composition to stand on the fibres, iv) rinsing the said fibres, v) optionally shampooing the fibres, rinsing them and drying them.

It is clearly understood that, depending on the nature of the envelopes, the composition capable of dissolving the envelope will be water or an aqueous composition when the envelope predominantly or solely contains a hydrophilic envelope, and the composition capable of dissolving the envelope will be an anhydrous organic composition or an aqueous composition comprising at least one liquid fatty substance or at least one organic solvent other than liquid fatty substances such as lower monoalcohols, for example ethanol, or such as polyols, for example propylene glycol or glycerol, when the article predominantly or solely contains lipophilic laps and envelope.

Thus, the aqueous composition may simply be water. The aqueous composition may optionally comprise at least one polar solvent. Among the polar solvents that may be used in this composition, mention may be made of organic compounds that are liquid at room temperature (25°C) and at least partially water-miscible.

Examples that may be mentioned more particularly include alkanols such as ethyl alcohol, isopropyl alcohol, aromatic alcohols such as benzyl alcohol and phenylethyl alcohol, or polyols or polyol ethers, for instance ethylene glycol monomethyl, monoethyl or monobutyl ether, propylene glycol or ethers thereof, for instance propylene glycol monomethyl ether, butylene glycol, dipropylene glycol, and also diethylene glycol alkyl ethers, for instance diethylene glycol monoethyl ether or monobutyl ether.

More particularly, if one or more solvents are present, their respective content in the aqueous composition ranges from 0.5% to 20% and preferably from 2% to 10% by weight relative to the weight of the said aqueous composition.

According to an advantageous variant, the packaging article comprises at least one chemical oxidizing agent iii) as defined previously. The dyeing process as defined previously then uses in the first step an aqueous composition which optionally comprises at least one basifying agent as defined previously or optionally at least one ingredient chosen from direct dyes, in particular cationic direct dyes, preferentially those bearing endocyclic, styryl, azoic and hydrazono, particularly azoic and hydrazono, cationic charges; ammonium salts v), preferably chosen from ammonium halides such as ammonium chloride, ammonium sulfate, ammonium phosphate and ammonium nitrate; organic fatty substances vi) preferably chosen from mineral oils, in particular liquid petroleum jelly; thickening polymers vii); surfactants viii), preferably nonionic or anionic surfactants, chosen in particular from (Ci ₂ -C ₂ o)alkyl sulfates and (Ci ₂ -C ₂ o)alkyl ether sulfates comprising from 2 to 20 ethylene oxide units, especially in the form of alkali metal salts, ammonium salts, amino alcohol salts and alkaline-earth metal salts, or a mixture of these compounds; preferably (Ci ₂ -C ₂₀ )alkyl sulfates such as an alkali metal lauryl sulfate such as sodium lauryl sulfate; and cationic or amphoteric substantive polymers ix) as defined previously.

These optional additives may be present in the packaging article.

Preferentially, the dyeing process as defined previously is such that the dilution ratio of one or more packaging articles as defined previously/the compound capable of dissolving the article(s), expressed on a weight basis, is inclusively between 10/90 and 90/10 and preferably between 10/90 and 50/50. Preferentially, this ratio is 20/80.

When the composition capable of dissolving the article is an aqueous hydrogen peroxide solution, it preferably has a pH of less than 7. The acidic pH ensures the stability of the hydrogen peroxide in the composition. It may be obtained using acidifying agents, for instance hydrochloric acid, acetic acid, etidronic acid, phosphoric acid, lactic acid or boric acid, and it may be conventionally adjusted by adding either basifying agents, for instance aqueous ammonia, monoethanolamine, diethanolamine, triethanolamine, isopropanolamine, 1 ,3-diaminopropane, an alkali metal or ammonium (bi)carbonate, an organic carbonate such as guanidine carbonate, or an alkali metal hydroxide, all these compounds, needless to say, possibly being taken alone or as a mixture.

The pH of the resulting mixture is usually inclusively between 7 and 12. Preferably, the pH of the said mixture is usually inclusively between 7.5 and 1 1 .

Once the mixing has been performed to obtain the ready-to-use composition, this composition is applied to the wet or dry human keratin fibres.

The leave-on time is generally of the order of between 1 minute and 1 hour and preferably from 10 to 30 minutes.

The working temperature during the process is conventionally between room temperature (between 15 and 25°C) and 80°C and preferably between room temperature and 60°C.

After the treatment, the human keratin fibres are optionally rinsed with water, washed with shampoo, rinsed again with water, and then dried or left to dry.

The examples that follow illustrate the invention without, however, limiting its scope.

EXAMPLES

/) The following compositions were prepared.

The values are expressed as grams of active material for a composition total of 100 grams.

Dye compositions A:

Resorcinol 0.85 2.73 m-Aminophenol 0.24 0.23

Toluene-2,5-diamine sulfate - 6.2

Glycol distearate 2 -

Liquid petroleum jelly - 4

Cetearyl alcohol 1 1.5 -

Olea europa olive oil 0.2 -

Fragrances 0.95 -

Carboxymethylcellulose sodium salt - 10

Hexadimethrine chloride 2.4 -

Hydroxyethylcellulose - 15

Polyquaternium-6 1 .48 -

Carbomer 0.39 -

Propylene glycol 9 -

Laurie acid 3 -

Laureth-12 7 -

Deceth-3 10 -

Sodium lauryl sulfate - 2

Oleth-30 4 -

Ascorbic acid 0.25 -

Water qs 100.00 -

Nonwoven of polyvinyl alcohol (PVA) fibres with a

- 3 mean diameter of about 10 microns

Oxidizing compositions B:

Ingredients B1 B2 B3

Pentasodium pentetate 0.006 - -

Hydrogen peroxide 6 3.9 -

Sodium stannate 0.04 - -

Phosphoric acid qs pH 2.2 qs pH 2.2 -

Tetrasodium etidronate - 0.06 -

Tetrasodium pyrophosphate 0.02 0.04 -

Sodium carbonate peroxide - - 97

Sodium salicylate - 0.035 - Nonwoven of polyvinyl alcohol (PVA)

fibres with a mean diameter of about 10 3 microns

Glycerol 0.5 - -

Trideceth-2-carboxamide MEA 0.85 - -

Cetearyl alcohol 2.28 - -

Ceteareth-25 0.57 - -

Water qs 100.00 qs 100.00 -

B1: 20-volumes oxidizing cream

B2: 13-volumes liquid oxidizing agent

B3: powdered oxidizing agent

Composition C (dye formula + powdered oxidizing agent)

The reference aqueous compositions are prepared conventionally.

The packaging article is prepared in two stages, in a first stage, the powdered ingredients are selected, including the oxidation dyes. The mixture of the powdered ingredients is then homogenized. In a second stage, the envelope is prepared from PVA which are in the form of two nonwoven laps joined together at the periphery, but leaving a part gaping allowing the introduction of ingredients. This double lap is in the form of a disc (5 cm in diameter and 3 mm thick).

The mixture of the said powdered ingredients is then introduced between the two PVA laps of the disc, and the gaping part is then closed.

///) Protocol for evaluating the technical effect of the said compositions

The 3.3 g packaging article of the invention is mixed according to the indications in the following table in a 1/9 (weight/weight) ratio in a bowl or a heating bottle.

The mixture is applied to the hair, with a leave-on time of 30 minutes.

The hair is rinsed and is then optionally but preferably shampooed, and the hair is then dried.

Examples of mixtures

The values are expressed in grams for a mixture total of 100 grams or according to the above procedure.

The water-soluble packaging article does not in any way change the colouring quality of the keratin fibres when compared with the reference. In particular, in terms of intensity and chromaticity, the colouring results are very satisfactory. Furthermore, the application and localization of the compositions is easy and very pleasant, and does not go outside the areas to be treated. It should be noted that the process is very easy to implement since it is a matter of dissolving the packaging article. It was also observed that the colour obtained is very uniform from the root to the end of the hairs. Other packaging articles according to the invention

Ingredients A3 Amount

1 -Methyl-2,5-diaminobenzene sulfate 12

1 -Hydroxy-3-aminobenzene 6

Ammonium sulfate 10

Anhydrous sodium metasilicate 15

Sodium lauryl sulfate 2

Carboxymethycellulose sodium salt 10

Hydroxyethylcellulose 15

Sorbitol 23

Liquid petroleum jelly 4

Nonwoven based on polyvinyl alcohol (PVA) fibres 3

Ingredients A4 Amount

1 -Methyl-2,5-diaminobenzene sulfate 6.2

Resorcinol 2.73 m-Aminophenol 0.23

2-Methyl-5-hydroxyethylaminophenol 0.21

Ammonium sulfate 10

Sodium metasilicate 15

Sodium lauryl sulfate 2

Carboxymethylcellulose sodium salt 10

Hydroxyethylcellulose 15

Sorbitol 31.63

Liquid petroleum jelly 4

Nonwoven of polyvinyl alcohol (PVA) fibres with a mean diameter of about 3

10 microns

Ingredients A5 Amount

1 -Methyl-2,5-diaminobenzene sulfate 1 .59

1 -Hydroxy-4-aminobenzene 1 .32

1 ,3-hydroxybenzene (resorcinol) 0.35

1 -Hydroxy-3-aminobenzene 0.53

1 -Methyl-2-hydroxy-4- -hydroxyethylaminobenzene 0.26

2-Methyl-1 ,3-dihydroxybenzene (2-methylresorcinol) 1 .5

Ammonium sulfate 10

Anhydrous sodium metasilicate 15 Powdered sodium lauryl sulfate 2

Carboxymethylcellulose salt 10

Hydroxyethylcellulose 15

Sorbitol 35.45

Liquid petroleum jelly 4

Nonwoven of polyvinyl alcohol (PVA) fibres with a mean diameter of about 3

10 microns

These articles are prepared according to the process described in part (II) above and are mixed before use with an oxidizing composition such as B1 ,B2 or B3 as defined previously.

Efficient colourings are thus obtained, with great ease of use.

IV) Comparative data film vs. fiber

The following compositions were prepared. The values are expressed as grams of active material for a composition total of 100 grams.

Oxidizing composition B' :

Ingredients (liquid oxidant in 13 vol) B'

Hydrogen peroxide 3.9 ma

Tetrasodium etidronate 0.06 ma Tetrasodium pyrophosphate 0.04

Sodium salicylate 0.035

Phosphoric acid qs pH 2.2

Water Qs 100

The packaging article is prepared in two stages, in a first stage, the powdered ingredients are selected, including the oxidation dyes. The mixture of the powdered ingredients is then homogenized. In a second stage, the envelope is prepared from PVA which are in the form of two nonwoven laps (for invention) or film laps (for comparative) joined together at the periphery, but leaving a part gaping allowing the introduction of ingredients. This double lap is in the form of a disc (5 cm in diameter and 3 mm thick).

The mixture of the said powdered ingredients is then introduced between the two PVA laps of the disc, and the gaping part is then closed.

At the time of treatment each of composition ΑΊ and A'2 is mixed with the oxidizing composition B' with the weight ratio of 10 parts of composition ΑΊ and A'2 for 90 parts of composition B' in a bowl until total solubilisation of the ingredients and homogeneity of the mixture. Each mixture ΑΊ + B' and A'2 + B' is then applied on 90 % natural white haire (90 NW) with a bath ratio of 10 g of mixture for 1 g of lock, with a leave-on time of 30 minutes at 27 °C. The hair is rinsed and is then shampooed, and the hair is then dried.

Chromaticity C ^*

The coloration is measured using a Minolta CM 3600 D spectrocolorimeter. The chromaticity is evaluated in the CIE L ^* a ^* b ^* system. In this L ^* a ^* b ^* system, L ^* represents the intensity of the colour, a ^* indicates the green/red colour axis and b ^* indicates the blue/yellow colour axis.

The value of chromaticity C ^* is calculated from the values of a ^* b ^* according to equation (i) below:

The greater the value of C ^* , the better the chromaticity of the treated fibres.

Results

The following colorations are obtained:

Chromaticity a* b* C*

ΑΊ + B' (comparative) 1 .2 -0.1 1 .2

A'2 + B' (invention) 2.8 1 .6 3.2 The chromaticity of the mixture according to the invention with fibers is significantly higher than that obtained with the film.