The present invention relates to a composition for cleansing and conditioning keratin fibres, in particular human keratin fibres such as the hair, comprising one or more anionic surfactants, two or more particular nonionic surfactants preferably in a total content of at least 3% by weight relative to the total weight of the composition, one or more amphoteric surfactants preferably in a total content of at least 2% by weight relative to the total weight of the composition and one or more cationic polymers having a cationic charge density of greater than or equal to 4 meq./g.

The invention also relates to a process for cleansing and conditioning keratin fibres and also to a use involving said composition.

It is common practice to use detergent compositions (such as shampoos) based essentially on standard surfactants especially of anionic, nonionic and/or amphoteric type, but more particularly of anionic type, for cleansing and/or washing keratin fibres such as the hair. These compositions are applied to wet hair and the foam generated by massaging or rubbing with the hands makes it possible, after rinsing with water, to remove the diverse types of soiling initially present on the hair or the skin.

These detergent compositions do, admittedly, have good washing power, but the cosmetic properties thereby imparted still remain to be improved, especially when they are applied to sensitized hair, i.e. hair that is generally damaged or embrittled by the action of external atmospheric agents, such as light and bad weather, and/or mechanical or chemical treatments, such as brushing, combing, dyeing, bleaching, permanent waving and/or relaxing.

Moreover, these compositions have a relatively aggressive nature since their application may result in the long run in more or less pronounced damage on the hair fibre associated in particular with the gradual removal of the lipids or proteins contained in or at the surface of said fibre. Thus, it is often common practice to resort to care compositions using complementary cosmetic agents known as conditioning agents in order to improve the cosmetic properties of sensitized hair. These conditioning agents may, of course, also improve the cosmetic behaviour of natural hair.

These care compositions are especially hair conditioners, which may be in the form of hair gels or lotions or more or less thick creams.

However, the cationic surfactants used in such care compositions, especially in hair conditioners, are difficult to use in detergent compositions on account of their incompatibility with anionic surfactants.

In particular, their incompatibility with anionic surfactants may give rise to stabilization difficulties for the detergent compositions and have an impact on their working qualities, especially in terms of foaming power and/or start of foaming.

Furthermore, the presence of cationic surfactants in the detergent compositions may lead, after one or more applications to the hair, to heaviness or overcharging of the head of hair (which is known as the build-up effect), thus having a negative impact on the cosmetic properties imparted.

Moreover, such care compositions give the hair cosmetic properties that may fade out after the application of one or more non-treating shampoos. There is thus a real need to develop compositions for cleansing and conditioning keratin fibres, which do not have all of the drawbacks mentioned above, i.e. which are capable of imparting improved cosmetic properties, after one or more applications, which are shampoo -resistant without making the head of hair charged or heavy, while at the same time maintaining good washing power and satisfactory working qualities.

This aim is achieved by the present invention, one subject of which is especially a cosmetic composition, preferably a hair composition, intended especially for cleansing and conditioning keratin fibres, in particular human keratin fibres such as the hair, comprising:

(a) one or more anionic surfactants,

(b) a mixture of a first nonionic surfactant chosen from saturated or unsaturated, linear or branched, oxyalkylenated Cs to C ₄ o fatty alcohols and of a second nonionic surfactant, different from the first nonionic surfactant, chosen from saturated or unsaturated, linear or branched, oxyalkylenated Cs to C ₄ o fatty alcohols, oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C30 acids and of sorbitol, or mixtures thereof; the mixture of nonionic surfactants preferably being present in a total content of at least 3% by weight relative to the total weight of the composition,

(c) one or more amphoteric surfactants, preferably present in a total content of at least 2% by weight relative to the total weight of the composition, and

(d) one or more cationic polymers having a cationic charge density of greater than or equal to 4 meq./g.

Specifically, the composition according to the invention makes it possible to improve the cosmetic properties imparted to the keratin fibres, especially to the hair, preferably sensitized hair. In particular, the composition according to the invention makes it possible to improve the disentangling, the suppleness and also the feel of the hair, without a build-up effect.

It is thus possible to obtain adequate conditioning immediately on application, which may be shampoo-resistant, which does not make the hair feel charged, with a composition which develops an abundant, good-quality foam.

The invention may also make it possible to convey and deposit larger amounts of cationic polymers; finally, the compositions are of interest in the field of protecting the colour of dyed hair against washing (shampooing).

The composition according to the invention also has the advantage of being stable on storage both at room temperature (20-25°C) and at 45°C, especially as regards its visual aspect and/or its viscosity.

For the purposes of the present invention, the term "stable" refers to a composition which, after two months of storage at 25 to 45°C, shows no change in appearance, colour, odour or viscosity.

The composition may be transparent; it may also be pearlescent, where appropriate.

The composition according to the invention may also have satisfactory foaming power.

The composition according to the invention also makes it possible to apply conditioning agents, such as cationic polymers, in an amount sufficient to obtain adequate cosmetic conditioning properties.

Preferably, the composition according to the invention is non-colouring. According to the present invention, the term "non-colouring composition" means a composition not containing any dye for keratin fibres, such as direct dyes or oxidation dye precursors (bases and/or couplers). If they are present, their content does not exceed 0.005% by weight, relative to the total weight of the composition. Specifically, at such a content, only the composition would be dyed, i.e. no dyeing effect would be observed on the keratin fibres.

The invention thus relates to a composition comprising the compounds (a), (b), (c) and (d) as defined above.

The present invention also relates to a process for washing and conditioning keratin fibres, in particular human keratin fibres such as the hair, comprising the application to said fibres of a composition according to the invention.

The invention also relates to the use of the composition according to the invention as a shampoo for washing and conditioning the hair.

Other subjects, characteristics, aspects and advantages of the invention will emerge even 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 in that range, in particular in the expressions "between" and "ranging from ... to

Moreover, the expression "at least one" used in the present description is equivalent to the expression "one or more".

Anionic surfactants

As indicated above, the composition comprises one or more anionic surfactants.

For the purposes of the present invention, 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 C0 ₂ H, C0 ₂ ^" , SO ₃ H, SO ₃ ^" , OSO3H, OSO3 ^" , H2PO3, HPO3 ^" , PO3 ^2" , H2PO2, HPO2 ^" , P0 ₂ ^2" , POH and PO\

Preferably, the anionic surfactants used in the composition according to the invention are chosen from anionic surfactants comprising in their structure one or more sulfate and/or sulfonate and/or phosphate and/or carboxylate groups, and/or mixtures thereof. Preferentially, the composition according to the invention comprises one or more carboxylic alkyl ether anionic surfactants.

More preferentially, the composition according to the invention comprises a mixture of anionic surfactants and especially one or more anionic surfactants comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups and one or more carboxylic alkyl ether anionic surfactants.

The anionic surfactant(s) comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups may be oxyethylenated and/or oxypropylenated. The total average number of ethylene oxide (EO) and/or propylene oxide (PO) groups may then range from 1 to 50 and especially from 2 to 10.

The anionic surfactant(s) comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups may be chosen from alkyl sulfates, alkylamido sulfates, alkyl ether sulfates, alkylamido ether sulfates, alkylaryl ether sulfates, alkyl ether sulfosuccinates, acyl isethionates and methyl acyl taurates, olefin sulfonates, and salts thereof; the alkyl or acyl group of all these various compounds preferably containing from 8 to 24 carbon atoms, and the aryl group preferably denoting a phenyl or benzyl group.

Among the anionic surfactants comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups, it is preferred to use one or more anionic sulfate surfactants, preferentially chosen from Cs-Ci ₄ and more particularly C12-C14 alkyl ether sulfates, and/or from the olefin sulfonates.

Preferably, the anionic surfactant(s) comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups are in the form of salts, and in particular of alkaline salts, especially sodium salts, ammonium salts, amine salts, including amino alcohol salts, and/or magnesium salts. These salts preferably comprise from 2 to 5 ethylene oxide groups.

Among these salts, sodium, triethanolamine, magnesium or ammonium (C ₁₂ - Ci ₄ )alkyl sulfates and/or sodium, ammonium or magnesium (Ci2-Ci ₄ )alkyl ether sulfates, which are oxyethylenated, for example with 1 or 2.2 mol of ethylene oxide or sodium olefin sulfonates, are more preferably used.

Better still, the surfactant(s) comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups are chosen from sodium, ammonium or magnesium (Ci2-Ci ₄ )alkyl ether sulfates oxyethylenated with 2.2 mol of ethylene oxide, as sold under the name Texapon N702 by the company Cognis. Among the anionic surfactant(s) comprising in their structure one or more sulfate and/or sulfonate and/or phosphate groups, it is preferred to use sodium or ammonium lauryl ether sulfates or sodium olefin sulfonates.

The carboxylic alkyl ether anionic surfactant(s) that may be used according to the invention preferably comprise a C ₆ -C24 alkyl chain.

The carboxylic alkyl ether anionic surfactant(s) may be chosen, alone or as mixtures, from:

- (C ₆ -C24)alkyl ether carboxylic acids,

- (C ₆ -C24)alkylaryl ether carboxylic acids,

- (C ₆ -C24)alkylamido ether carboxylic acids,

- and salts thereof.

The carboxylic alkyl ether anionic surfactant(s) may be oxyalkylenated, preferably oxyethylenated and/or oxypropylenated. The total average number of alkylene oxide groups then preferably ranges from 2 to 50, in particular from 2 to 24 and better still from 2 to 15.

When the carboxylic alkyl ether anionic surfactant(s) are oxyalkylenated, they preferably comprise from 2 to 50 alkylene oxide groups and in particular from 2 to 50 ethylene oxide (EO) groups.

Preferably, the carboxylic alkyl ether anionic surfactant(s) are neutralized with one or more salts. The salts are chosen in particular from alkaline salts and especially sodium salts, ammonium salts, amine salts, including amino alcohol salts such as triethanolamine or monoethanolamine salts, and magnesium salts.

The polyethoxylated carboxylic anionic surfactants more preferably used are those corresponding to formula (I) below:

Ri(OC ₂ H4)„OCH ₂ COOA (I) in which:

Ri represents a linear or branched C8-C ₂₂ alkyl or alkenyl group or mixture of groups, a (Cs-C^alkylphenyl group, a group R ₂ CONH-CH ₂ -CH ₂ - with R ₂ denoting a linear or branched Cn-C ₂₁ alkyl or alkenyl group,

n is an integer or decimal number (average value) that may range from 2 to 24 and preferably from 2 to 15, A denotes H, NH ₄ , Na, K, Li, Mg or a monoethanolamine or triethanolamine residue. Mixtures of compounds of formula (I) may also be used, in particular mixtures in which the groups Ri are different.

Preferably, Ri denotes a group or a mixture of groups chosen from C ₁₂ -C ₁₄ alkyl, cocoyl, oleyl, nonylphenyl and octylphenyl groups; A denotes a hydrogen or sodium atom; and n ranges from 2 to 20 and preferably from 2 to 10.

Even more preferentially, use is made of compounds of formula (I) in which Ri denotes a C ₁₂ alkyl group, A denotes a hydrogen or sodium atom and n ranges from 2 to 10.

Among the commercial products that may preferably be used are the products sold by the company KAO under the names:

Akypo® NP 70 (Ri = nonylphenyl, n = 7, A = H)

Akypo® NP 40 (Ri = nonylphenyl, n = 4, A = H)

Akypo® OP 40 (Ri = octylphenyl, n = 4, A = H)

Akypo® OP 80 (Ri = octylphenyl, n = 8, A = H)

Akypo® OP 190 (Ri = octylphenyl, n = 19, A = H)

Akypo® RLM 38 (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 4, A = H)

Akypo® RLM 38 NV (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 4, A = Na)

Akypo® RLM 45 CA (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 4.5, A = H)

Akypo® RLM 45 NV (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 4.5, A = Na)

Akypo® RLM 100 (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 10, A = H)

Akypo® RLM 100 NV (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 10, A = Na)

Akypo® RLM 130 (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 13, A = H)

Akypo® RLM 160 NV (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 16, A = Na)

or by the company Sandoz under the names:

Sandopan DTC-Acid (Ri = (Ci ₃ )alkyl, n = 6, A = H)

Sandopan DTC (Ri = (Ci ₃ )alkyl, n = 6, A = Na)

Sandopan LS 24 (Ri = (Ci ₂ -Ci ₄ )alkyl, n = 12, A = Na)

Sandopan JA 36 (Ri = (Ci ₃ )alkyl, n = 18, A = H),

and more particularly the products sold under the following names:

Akypo® RLM 45 (INCI: Laureth-5 carboxylic acid)

Akypo® RLM 100

Akypo® RLM 38. Among the carboxylic alkyl ether anionic surfactants, use is preferably made of lauryl ether carboxylic acids or sodium lauryl ether carboxylates.

Preferably, the anionic surfactants are chosen from sulfate anionic surfactants, chosen especially from Cs-Ci ₄ alkyl ether sulfates and carboxylic alkyl ether surfactants.

Preferentially, the composition according to the invention comprises one or more carboxylic alkyl ether surfactants corresponding to formula (I).

More preferentially, the composition according to the invention comprises a mixture of sulfate anionic surfactants, chosen especially from Cs-Ci ₄ and more particularly C ₁₂ -C ₁₄ alkyl ether sulfates, and carboxylic alkyl ether surfactants corresponding to formula (I) as described previously.

The anionic surfactant(s) may be present in the composition according to the invention in a total content ranging from 1% to 20% by weight, preferably in a content ranging from 2% to 18% by weight and better still from 4% to 15% by weight relative to the total weight of the composition.

Nonionic surfactants

As indicated above, the composition comprises a mixture of nonionic surfactants the composition comprises at least a first nonionic surfactant chosen from saturated or unsaturated, linear or branched, oxyalkylenated Cs to C ₄ o fatty alcohols and at least a second nonionic surfactant, different from the first nonionic surfactant, chosen from (i) saturated or unsaturated, linear or branched, oxyalkylenated Cs to C ₄ o fatty alcohols, and (ii) oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C30 fatty acids and of sorbitol.

The nonionic surfactant(s) present in the composition 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.

The oxyalkylene units of the nonionic surfactants are more particularly oxyethylene or oxypropylene units, or their combination, preferably oxyethylene units.

The number of moles of ethylene oxide and/or of propylene oxide preferably ranges from 1 to 250, more particularly from 2 to 100 and better still from 2 to 50. Advantageously, the two nonionic surfactants according to the invention do not comprise any oxypropylene units.

Preferably, the saturated or unsaturated, linear or branched, oxyethylenated C ₈ -C40 fatty alcohols comprise from 1 to 100 mol of ethylene oxide, in particular from 2 to 50 and more particularly from 2 to 40 mol of ethylene oxide and preferably comprise one or two fatty chains.

Thus, the oxyethylenated fatty alcohols according to the invention are advantageously chosen from those of formula Ρν-(0- ¾ ¾) _η -ΟΗ, in which R is a saturated or unsaturated, linear or branched Cs to C40 hydrocarbon-based radical, preferably a linear or branched Cs to C40 alkyl radical; especially of C ₈ -C24, or even C8-C20, and better still C ₁₀ -C ₁₈ , and

n is an integer ranging from 1 to 100, in particular from 2 to 50, or even from 2 to 40, and better still from 3 to 20. More preferentially, the saturated or unsaturated, linear or branched, oxyethylenated Cs to C40 fatty alcohols comprise from 3 to 20 mol of ethylene oxide and comprising preferably at least one C8-C ₂₀ and especially C ₁₀ -C ₁₈ alkyl chain, and correspond especially to lauryl alcohol containing 4 mol of ethylene oxide (INCI name: Laureth-4) and lauryl alcohol containing 12 mol of ethylene oxide (INCI name: Laureth-12).

The oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C30 fatty acids and of sorbitol are preferentially chosen from oxyethylenated esters of Cs to Ci4 fatty acid and of sorbitan comprising from 2 to 10 oxyethylene units.

More preferably, said esters are chosen from oxyethylenated esters of C ₁₂ fatty acid and of sorbitan comprising from 2 to 10 oxyethylene units and preferably 4 oxyethylene units.

Even more preferably, it is sorbitan monolaurate oxyethylenated with 4 OE. This compound is also known under the name Polysorbate 20. It is sold, inter alia, under the name Tween 20 by the company Uniqema.

According to a first embodiment, the composition according to the invention comprises at least two saturated or unsaturated, linear or branched, oxyalkylenated Cs to C40 fatty alcohols, which are different from each other.

Preferably, said two oxyethylenated fatty alcohols are chosen from those of formula R-(0-CH ₂ CH ₂ ) _n -OH, in which R is a saturated or unsaturated, linear or branched Cs to C40 hydrocarbon-based radical, preferably a linear or branched Cs to C40 alkyl radical; especially of C ₈ -C24, or even C ₈ -C20, and better still C ₁₀ -C ₁₈ , and n is an integer ranging from 1 to 100, in particular from 2 to 50, or even from 2 to 40, and better still from 3 to 20.

According to another embodiment, the composition according to the invention comprises one or more saturated or unsaturated, linear or branched, oxyalkylenated Cs to C40 fatty alcohols and one or more oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C30 fatty acids and of sorbitol.

Preferably, said oxyethylenated fatty alcohols are chosen from those of formula Ρν-(0- ¾ ¾) _η -ΟΗ, in which R is a saturated or unsaturated, linear or branched, Cs to C40 hydrocarbon-based radical, preferably a linear or branched Cs to C40 alkyl radical; especially of C8-C24, or even C8-C20, and better still C ₁₀ -C ₁₈ , and n is an integer ranging from 1 to 100, in particular from 2 to 50, or even from 2 to 40, and better still from 3 to 20.

Preferably, said esters are chosen from oxyethylenated esters of Cs to C ₁₄ fatty acid and of sorbitan comprising from 2 to 10 oxyethylene units; better still from oxyethylenated esters of C ₁₂ fatty acid and of sorbitan comprising from 2 to 10 oxyethylene units and preferably 4 oxyethylene units; better still sorbitan monolaurate oxyethylenated with 4 OE.

The composition according to the invention comprises preferably the nonionic surfactants in a total content of at least 3% by weight, preferably in a content ranging from 3% to 20% by weight, more preferentially in a content ranging from 4% to 15% by weight relative to the total weight of the composition, better still from 4.5% to 12% by weight.

Amphoteric surfactants

As indicated above, the composition comprises one or more amphoteric surfactants which are preferably present in a total content of greater than or equal to at least 2% by weight relative to the total weight of the composition, especially greater than or equal to 3% by weight.

In particular, the amphoteric or zwitterionic surfactant(s), which are preferably non-silicone, used in the composition according to the present invention may especially be derivatives of optionally quatemized aliphatic secondary or tertiary amines, in which derivatives the aliphatic group is a linear or branched chain comprising from 8 to 22 carbon atoms, said amine derivatives containing at least one anionic group, for instance a carboxylate, sulfonate, sulfate, phosphate or phosphonate group.

Mention may in particular be made of (Cs-C ₂ o)alkyl betaines, (Cs-C ₂ o)alkyl sulfobetaines, (C ₈ -C ₂ o)alkylamido(C ₃ -C ₈ )alkyl betaines and (C ₈ -C ₂ o)alkylamido(C6- Cs)alkyl sulfobetaines.

Among the optionally quaternized derivatives of secondary or tertiary aliphatic amines that can be used, as defined above, mention may also be made of the compounds with respective structures (II) and (III) below:

R _a -CONHCH ₂ CH ₂ -N ⁺ (Rb)(Rc)-CH ₂ COO ^" , M ⁺ , X ^" (II) in which formula:

- Ra represents a C ₁₀ to C ₃₀ alkyl or alkenyl group derived from an acid R _a COOH preferably present in hydro lysed coconut oil, or a heptyl, nonyl or undecyl group;

- Rb represents a beta-hydroxyethyl group; and

- Rc represents a carboxymethyl group;

- M ⁺ represents a cationic counterion resulting from an alkali metal or alkaline-earth metal, such as sodium, an ammonium ion or an ion resulting from an organic amine; and

- X ^" represents an organic or mineral anionic counterion, such as that chosen from halides, acetates, phosphates, nitrates, (Ci-C4)alkyl sulfates, (Ci- C ₄ )alkyl- or (Ci-C ₄ )alkylarylsulfonates, in particular methyl sulfate and ethyl sulfate; or alternatively M ⁺ and X ^" are absent;

R _a .-CONHCH ₂ CH ₂ -N(B)(B') (III) in which formula:

- B represents the group -CH ₂ CH ₂ OX';

- B' represents the group -(CH ₂ ) _Z Y', with z = 1 or 2;

- X represents the group -CH ₂ COOH, -CH ₂ -COOZ',

-CH ₂ CH ₂ COOH, -CH ₂ CH ₂ -COOZ', or a hydrogen atom; - Y' represents the group -COOH, -COOZ' or

-CH ₂ CH(OH)S0 ₃ H or the group CH ₂ CH(OH)S0 ₃ -Z';

- Z' represents a cationic counterion resulting from an alkali metal or alkaline-earth metal, such as sodium, an ammonium ion or an ion resulting from an organic amine;

- Ra' represents a C ₁₀ to C ₃ o alkyl or alkenyl group of an acid Rv-COOH which is preferably present in coconut oil or in hydrolysed linseed oil, or an alkyl group, especially a C ₁₇ group, and its iso form, or an unsaturated C ₁₇ group.

These compounds are classified in the CTFA dictionary, 5th edition, 1993, under the names disodium cocoamphodiacetate, disodium lauroamphodiacetate, disodium caprylamphodiacetate, disodium capryloamphodiacetate, disodium cocoamphodipropionate, disodium lauroamphodipropionate, disodium caprylamphodipropionate, disodium capryloamphodipropionate, lauroamphodipropionic acid and cocoamphodipropionic acid.

By way of example, mention may be made of the cocoamphodiacetate sold by the company Rhodia under the trade name Miranol ^® C2M Concentrate.

Use may also be made of the compounds of formula (IV):

R _a" -NHCH(Y")-(CH ₂ ) _n CONH(CH ₂ ) _n .-N(R _d )(R _e ) (IV) in which formula:

- Y" represents the group -COOH, -COOZ" or -CH ₂ -CH(OH)S0 ₃ H or the group CH ₂ CH(OH)S0 ₃ -Z";

- Rd and R _e represent, independently of each other, a Ci to C ₄ alkyl or hydroxyalkyl radical;

- Z" represents a cationic counterion resulting from an alkali metal or alkaline-earth metal, such as sodium, an ammonium ion or an ion resulting from an organic amine;

- Ra" represents a Cio-C ₃ o alkyl or alkenyl group of an acid R^-COOH which is preferably present in coconut oil or in hydrolysed linseed oil;

- n and n' denote, independently of each other, an integer ranging from 1 to 3.

Mention may be made, among the compounds of formula (II), of the compound classified in the CTFA dictionary under the name sodium diethylaminopropyl cocoaspartamide and sold by Chimex under the name Chimexane HB.

These compounds can be used alone or as mixtures.

Among the amphoteric or zwitterionic surfactants mentioned above, use is preferably made of (C8-C2o)alkylbetaines such as cocoylbetaine, (C ₈ - C2o)alkylamido(C ₃ -C8)alkylbetaines such as cocamidopropylbetaine, and mixtures thereof, and the compounds of formula (IV) such as the sodium salt of diethylaminopropyl laurylaminosuccinamate (INCI name: sodium diethylaminopropyl cocoaspartamide).

Preferentially, the amphoteric or zwitterionic surfactants are chosen from

(C ₈ -C2o)alkylamido(C ₃ -C ₈ )alkylbetaines such as cocamidopropyl betaine.

Preferably, the amphoteric surfactant(s) are present in a total content ranging from 2% to 20% by weight, more preferentially in a content ranging from 3% to 15% by weight and better still from 3.5% to 10% by weight relative to the total weight of the composition.

Cationic polymers

The cosmetic composition also comprises one or more cationic polymers with a cationic charge density of greater than or equal to 4 milliequivalents/gram (meq./g).

The cationic charge density of a polymer corresponds to the number of moles of cationic charges per unit mass of polymer under conditions in which it is totally ionized. It may be determined by calculation if the structure of the polymer is known, i.e. the structure of the monomers constituting the polymer and their molar proportion or weight proportion. It may also be determined experimentally by the Kjeldahl method.

For the purposes of the present invention, the term "cationic polymer" denotes any polymer containing cationic groups and/or groups that can be ionized into cationic groups.

The cationic polymers with a charge density of greater than or equal to 4 meq./g that are preferred are chosen from those that contain units comprising primary, secondary, tertiary and/or quaternary amine groups that can either form part of the main polymer chain or be borne by a side substituent directly attached thereto. The cationic polymers used generally have a number-average molecular mass of between 500 and 5 x 10 ⁶ approximately and preferably between 10 ³ and 3 ^x 10 ⁶ approximately.

Among the cationic polymers having a charge density of greater than or equal to 4 meq./g, mention may more particularly be made of polymers of the polyamine, polyaminoamide and polyquaternary ammonium type.

These are known products. They are especially described in French patents 2 505 348 and 2 542 997. Among said polymers, mention may be made of:

(1) Homopolymers or copolymers derived from acrylic or methacrylic esters or amides and comprising at least one of the units of formula (V), (VI), (VII) or (VIII) below:

N

\

R; R, in which:

R ₃ , which may be identical or different, denote a hydrogen atom or a CH ₃ radical; A, which may be identical or different, represent a linear or branched alkyl group of 1 to 6 carbon atoms, preferably 2 or 3 carbon atoms, or a hydroxyalkyl group of 1 to 4 carbon atoms;

R4, R ₅ and R6, which may be identical or different, represent an alkyl group containing from 1 to 18 carbon atoms or a benzyl radical and preferably an alkyl group containing from 1 to 6 carbon atoms;

Ri and R ₂ , which may be identical or different, represent hydrogen or an alkyl group containing from 1 to 6 carbon atoms, and preferably methyl or ethyl;

X denotes an anion derived from a mineral or organic acid, such as a methosulfate anion or a halide such as chloride or bromide.

Mention may be made in particular of the ethyltrimethylammonium methacrylate chloride homopolymer.

The polymers of family (1) can also contain one or more units derived from comonomers which may be chosen from the family of acrylamides, methacrylamides, diacetone acrylamides, acrylamides and methacrylamides substituted on the nitrogen with lower (C ₁ -C4) alkyls, acrylic or methacrylic acids or esters thereof, vinyllactams such as vinylpyrrolidone or vinylcaprolactam, and vinyl esters.

Thus, among these polymers of family (1), mention may be made of:

- copolymers of acrylamide and of dimethylaminoethyl methacrylate quaternized with dimethyl sulfate or with a dimethyl halide,

copolymers of acrylamide and of methacryloyloxyethyltrimethylammonium chloride,

- the copolymer of acrylamide and of methacryloyloxyethyltrimethylammonium methosulfate,

- quaternized or non-quaternized vinylpyrrolidone/dialkylaminoalkyl acrylate or methacrylate copolymers,

These polymers are described in detail in French patents 2 077 143 and 2 393 573,

- dimethylaminoethyl methacrylate/vinylcaprolactam/vinylpyrrolidone terpolymers,

- vinylpyrrolidone/methacrylamidopropyldimethylamine copolymers,

quaternized vinylpyrrolidone/dimethylaminopropylmethacrylamide copolymers, the crosslinked polymers of methacryloyloxy(Ci-C ₄ )alkyltri(Ci- C ₄ )alkylammonium salts, such as the polymers obtained by homopolymerization of dimethylaminoethyl methacrylate quaternized with methyl chloride, or by copolymerization of acrylamide with dimethylaminoethyl methacrylate quaternized with methyl chloride, the homopolymerization or copolymerization being followed by crosslinking with an olefmically unsaturated compound, in particular methylenebisacrylamide. Use may more particularly be made of a crosslinked acrylamide/methacryloyloxyethyltrimethylammonium chloride copolymer (20/80 by weight) in the form of a dispersion containing 50% by weight of said copolymer in mineral oil. This dispersion is sold under the name Salcare® SC 92 by the company Ciba. Use may also be made of a crosslinked homopolymer of methacryloyloxyethyltrimethylammonium chloride comprising approximately 50% by weight of the homopolymer in mineral oil or in a liquid ester. These dispersions are sold under the names Salcare® SC 95 and Salcare® SC 96 by the company Ciba.

(2) Cyclopolymers of alkyldiallylamine or of dialkyldiallylammonium, such as homopolymers or copolymers comprising, as main constituent of the chain, units corresponding to formula (IX) or (X):

in which formulae k and t are equal to 0 or 1 , the sum k + t being equal to 1 ; R9 denotes a hydrogen atom or a methyl radical; R ₇ and Rs, independently of each other, denote an alkyl group containing from 1 to 6 carbon atoms, a hydroxyalkyl group in which the alkyl group preferably contains 1 to 5 carbon atoms, or a lower (C1-C4) amidoalkyl group, or R ₇ and Rs may denote, together with the nitrogen atom to which they are attached, heterocyclic groups, such as piperidyl or morpholinyl; R ₇ and R8, independently of each other, preferably denote an alkyl group containing from 1 to 4 carbon atoms; Y ^" is an anion such as bromide, chloride, acetate, borate, citrate, tartrate, bisulfate, bisulfite, sulfate or phosphate. These polymers are in particular described in French patent 2 080 759 and in its Certificate of Addition 2 190 406.

Among the polymers defined above, mention may be made more particularly of the dimethyldiallylammonium chloride homopolymer sold under the name Merquat 100 by the company Nalco (and its homologues of low weight- average molecular mass).

(3) The quaternary diammonium polymer containing repeating units corresponding to formula (XI):

^R io ^R 12

— N+ - A ₁ - N+- B ₁ (XI)

I I

R1 1 X ^{" R} 13 X ^"

in which formula (XV):

Rio, R11 , R12 and R13, which may be identical or different, represent aliphatic, alicyclic or arylaliphatic radicals containing from 1 to 6 carbon atoms or lower hydroxyalkylaliphatic radicals, or alternatively Rio, R11 , R12 and R13, together or separately, constitute, with the nitrogen atoms to which they are attached, heterocycles optionally containing a second heteroatom other than nitrogen, or alternatively Rio, R11, R12 and R13 represent a linear or branched Ci-C ₆ alkyl radical substituted with a nitrile, ester, acyl or amide group or a group -CO-O-R14-D or -CO- NH-R14-D where R14 is an alkylene and D is a quaternary ammonium group;

Al and Bl represent polymethylene groups containing from 2 to 8 carbon atoms, which may be linear or branched and saturated or unsaturated and may contain, bonded to or intercalated in the main chain, one or more aromatic rings, or one or more oxygen or sulfur atoms, or sulfoxide, sulfone, disulfide, amino, alkylamino, hydroxyl, quaternary ammonium, ureido, amide or ester groups, and X ^" denotes an anion derived from a mineral or organic acid; Al, Rio and R ₁₂ can form, with the two nitrogen atoms to which they are attached, a piperazine ring; in addition, if Al denotes a linear or branched, saturated or unsaturated alkylene or hydroxyalkylene radical, Bl can also denote a group - (CH ₂ )n-CO-D-OC-(CH ₂ )n- in which D denotes:

a) a glycol residue of formula: -O-Z-O-, where Z denotes a linear or branched hydrocarbon-based radical or a group corresponding to one of the following formulae:

-(CH ₂ -CH ₂ -0)x-CH ₂ -CH ₂ - -[CH ₂ -CH(CH ₃ )-0]y-CH ₂ -CH(CH ₃ )- where x and y denote an integer from 1 to 4, representing a defined and unique degree of polymerization or any number from 1 to 4 representing an average degree of polymerization;

b) a bis-secondary diamine residue, such as a piperazine derivative;

c) a bis-primary diamine residue of formula: -NH-Y-NH-, where Y denotes a linear or branched hydrocarbon-based radical, or else the divalent radical

-CH ₂ -CH ₂ -S-S-CH ₂ -CH ₂ -;

d) a ureylene group of formula: -NH-CO-NH-.

Preferably, X ^" is an anion, such as chloride or bromide.

These polymers have a number-average molecular mass generally between 1000 and 100 000.

Polymers of this type are especially described in French patents 2 320 330, 2 270 846, 2 316 271, 2 336 434 and 2 413 907 and US patents 2 273 780, 2 375 853, 2 388 614, 2 454 547, 3 206 462, 2 261 002, 2 271 378, 3 874 870, 4 001 432, 3 929 990, 3 966 904, 4 005 193, 4 025 617, 4 025 627, 4 025 653, 4 026 945 and 4 027 020.

It is more particularly possible to use polymers that are formed from repeating units corresp

(XII)

in which R ₁₀ , Rn, Ri ₂ and Ri ₃ , which may be identical or different, denote an alkyl or hydroxyalkyl radical containing from 1 to 4 carbon atoms approximately, n and p are integers ranging from 2 to 8 approximately, and X_ is an anion derived from a mineral or organic acid. Mention may be made in particular of Mexomer PO sold by the company Chimex.

(4) Poly quaternary ammonium polymers formed from repeating units of formula (XIII):

(XIII) in which p denotes an integer ranging from 1 to 6 approximately, D may be nothing or may represent a group -(CH2) _r -CO- in which r denotes a number equal to 4 or 7, and X ^" is an anion.

Such polymers may be prepared according to the processes described in US patents 4 157 388, 4 702 906 and 4 719 282. They are especially described in patent application EP-A-122 324.

Among these polymers, examples that may be mentioned include the products Mirapol A 15, Mirapol ADl, Mirapol AZl and Mirapol 175 sold by the company Miranol.

(5) Quaternary polymers of vinylpyrrolidone and of vinylimidazole.

Other cationic polymers that may be used in the context of the invention are polyalkyleneimines, in particular polyethyleneimines, polymers containing vinylpyridine or vinylpyridinium units, condensates of polyamines and of epichlorohydrin, polyquaternary ureylenes and chitin derivatives.

Hence the cationic polymers according to the invention are chosen preferentially from polymers, with a charge density of greater than or equal to 4 meq./g, belonging to families (1) to (5) as described above.

Among all the cationic polymers that may be used in the context of the present invention, it is preferred to use polymers of the family (2).

Preferably, the cationic polymer(s) are chosen from cyclopolymers of alkyldiallylamine or of dialkyldiallylammonium, such as homopolymers or copolymers comprising, as main constituent of the chain, units corresponding to formula (IX) or (X). Preferentially, the cationic polymers are chosen from dialkyldiallylammonium halide homopolymers, more particularly the dialkyldiallylammonium chloride homopolymer (INCI name: Polyquaternium-6) sold under the name Merquat® 100 by the company Lubrizol.

The content of cationic polymer(s) with a charge density of greater than or equal to 4 meq./g in the composition according to the invention may range from 0.05% to 5% by weight relative to the total weight of the composition, preferably from 0.1% to 3% by weight and more preferentially from 0.2% to 1.5% by weight relative to the total weight of the composition.

The total content of cationic polymer(s) in the composition according to the invention may range from 0.05% to 5% by weight relative to the total weight of the composition, preferably from 0.1% to 3% by weight and more preferentially from 0.2% to 1.5% by weight relative to the total weight of the composition.

According to one embodiment, the composition according to the invention comprises:

- one or more carboxylic alkyl ether anionic surfactants, preferably of formula (I) as defined above,

- a mixture of nonionic surfactants, preferably in a total content of at least 3% by weight relative to the total weight of the composition, comprising:

(i) a first nonionic surfactant chosen from among one or more oxyethylenated C to C ₄ o fatty alcohols comprising from 2 to 50 mol of ethylene oxide and preferably comprising at least one C ₈ -C ₂₀ alkyl chain, and

(ii) a second nonionic surfactant chosen from one or more oxyethylenated Cs to C ₄ o fatty alcohols comprising from 2 to 50 mol of ethylene oxide and preferably comprising at least one C ₈ -C ₂₀ alkyl chain, and one or more oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C ₃₀ fatty acids and of sorbitol, or mixtures thereof,

- one or more amphoteric surfactants, preferably in a total content of at least 2% by weight relative to the total weight of the composition, comprising one or more surfactants chosen from (C8-C ₂ o)alkylbetaines, (C ₈ -C ₂ o)alkylsulfobetaines, (C ₈ - C2o)alkylamido(C3-C8)alkylbetaines and (Cs-C2o)alkylamido(C6-

C ₈ )alkylsulfobetaines, and - one or more cationic polymers with a cationic charge density of greater than or equal to 4 meq./g, chosen from dialkyldiallylammonium halide homopolymers.

According to a second embodiment, the composition according to the invention comprises:

- one or more anionic surfactants chosen from sulfate anionic surfactants, especially from Cs-Ci4 alkyl ether sulfates and carboxylic alkyl ether surfactants,

- a mixture of nonionic surfactants, preferably in a total content of at least 3% by weight relative to the total weight of the composition, comprising:

(i) a first nonionic surfactant chosen from one or more oxyethylenated Cs to

C ₄ o fatty alcohols comprising from 2 to 50 mol of ethylene oxide and comprising preferably at least one C8-C20 alkyl chain, and

(ii) a second nonionic surfactant chosen from one or more oxyethylenated Cs to C40 fatty alcohols comprising from 2 to 50 mol of ethylene oxide and preferably comprising at least one C8-C20 alkyl chain, and one or more oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C ₃₀ fatty acids and of sorbitol, or mixtures thereof,

- one or more amphoteric surfactants, preferably in a total content of at least 2% by weight relative to the total weight of the composition, chosen from (C ₈ - C2o)alkylbetaines, (C8-C2o)alkylsulfobetaines, (C8-C2o)alkylamido(C3-

C8)alkylbetaines and (C8-C2o)alkylamido(C6-C8)alkylsulfobetaines, and

- one or more cationic polymers with a cationic charge density of greater than or equal to 4 meq./g, chosen from diallyldialkylammonium halide homopolymers.

In accordance with this second embodiment, the composition preferentially comprises a mixture of sulfate anionic surfactants, chosen especially from Cs-Ci4 and more particularly C ₁₂ -C ₁₄ alkyl ether sulfates, and carboxylic alkyl ether surfactants corresponding to formula (I) as defined previously.

In accordance with these two embodiments, the amphoteric surfactants are preferably chosen from (C8-C2o)alkylamido(C ₃ -C8)alkylbetaines.

In accordance with these two embodiments, the mixture of nonionic surfactants preferably comprises two or more different oxyethylenated C to C40 fatty alcohols comprising from 2 to 50 mol of ethylene oxide and comprising preferably at least one C8-C20 alkyl chain, or one or more oxyethylenated Cs to C40 fatty alcohols comprising from 2 to 50 mol of ethylene oxide and comprising preferably at least one C8-C20 alkyl chain, and one or more oxyalkylenated esters of saturated or unsaturated, linear or branched Cs to C30 fatty acids and of sorbitol. The composition according to the invention may comprise water or a mixture of water and one or more cosmetically acceptable solvents selected from Ci- C ₄ lower alcohols, such as ethanol, isopropanol, tert-butanol or n-butanol; polyols such as glycerol, propylene glycol and polyethylene glycols; and mixtures thereof.

The pH of the compositions according to the invention generally ranges from 3 to 10, preferably from 3.5 to 7 and better still from 4 to 5.5.

The composition according to the invention may also comprise one or more standard additives that are well known in the art, such as natural or synthetic thickeners or viscosity regulators; C12-C30 fatty alcohols; ceramides; fatty esters such as isopropyl myristate, myristyl myristate, cetyl palmitate and stearyl stearate; mineral, plant or synthetic oils such as a-olefms or avocado oil, rapeseed oil, apricot oil, camelina oil or liquid petroleum jelly; vitamins or provitamins; amphoteric or nonionic or anionic polymers; pH stabilizers, preserving agents; dyes; fragrances.

The thickener(s) may be chosen from cellulose-based thickeners, for example hydroxyethylcellulose, hydroxypropylcellulose and carboxymethylcellulose, guar gum and derivatives thereof, for example the hydroxypropyl guar sold by the company Rhodia under the reference Jaguar HP 105, gums of microbial origin, such as xanthan gum and scleroglucan gum, synthetic thickeners such as crosslinked acrylic acid or acrylamidopropanesulfonic acid homopolymers, for example Carbomer, nonionic, anionic, cationic or amphoteric associative polymers, such as the polymers sold under the names Pemulen TR1 or TR2 by the company Goodrich, Salcare SC90 by the company Ciba, Aculyn 22, 28, 33, 44 or 46 by the company Rohm & Haas, and Elfacos T210 and T212 by the company Akzo.

Mention may be made, among the amphoteric polymers used, of acrylamide/methacrylamidopropyltrimethylammonium chloride/acrylic acid terpolymers. Such polymers are listed in the CTFA International Cosmetic Ingredient Dictionary, 10th edition 2004, as Polyquaternium 53. Corresponding products are especially sold under the name Merquat 2003 by the company Lubrizol. A person skilled in the art will take care to select the optional additives and the amount thereof such that they do not harm the properties of the compositions of the present invention.

These additives are generally present in the composition according to the invention in an amount ranging from 0 to 20% by weight relative to the total weight of the composition.

The compositions in accordance with the invention may be used as shampoos for washing and conditioning the hair, and they are preferably applied in this case to wet hair in amounts that are effective for washing them, and the lather generated by massaging or rubbing with the hands may then be removed, after an optional leave-on time, by rinsing with water, the operation possibly being repeated one or more times.

Process and use according to the invention

Another subject of the present invention relates to a process for washing and conditioning keratin fibres, in particular human keratin fibres such as the hair, comprising the application to said fibres of a composition according to the invention as defined above.

The composition may be applied to wet or dry hair, and preferably to wet or moist hair.

The composition is preferably applied to sensitized hair, especially sensitized hair.

According to one embodiment, the process consists in applying to keratin fibres an effective amount of the composition according to the invention, optionally massaging the fibres, optionally leaving the composition to stand on the fibres, and rinsing.

The leave-on time of the composition on the keratin fibres may be between a few seconds and 15 minutes and preferably between 30 seconds and 5 minutes. The composition is generally rinsed out with water.

An optional step of drying the keratin fibres may be performed. The present invention also relates to the use of the composition according to the invention as described previously for washing and conditioning keratin fibres, in particular human keratin fibres such as the hair.

The examples that follow serve to illustrate the invention without, however, being limiting in nature.

EXAMPLES

The compositions according to the invention are prepared from the ingredients indicated in the table below, the amounts of which are expressed as weight percentages relative to the total weight of the composition.

qs qs qs qs qs qs qs qs

Sodium hydroxide/citric

pH = pH = pH = pH = pH = pH = pH = pH = acid

5±0.5 5±0.5 5±0.5 5±0.5 6±0.5 6±0.5 5±0.5 5±0.5 qs qs qs qs qs qs qs qs

Water

100 100 100 100 100 100 100 100

The compositions are applied to locks of moderately sensitized hair (SA20) at a rate of 0.37 g of composition per gram of hair. They are then worked with the fingers five times and then rinsed ten times under a tap at a flow rate of 4 1/minute with water at 38°C.

A panel of 5 experts compared the feel and the ease of the disentangling on wet hair, of locks treated with compositions A to G relative to those treated with the comparative composition.

All the experts noted a better cosmetic quality of the feel and also better ease of the disentangling for formulations A to G compared with the comparative composition.