DESCRIPTION

COMPOSITION COMPRISING AMPS POLYMER TECHNICAL FIELD

The present invention relates to a composition which is preferably of the O/W type, more preferably in the form of an O/W gel, and even more preferably in the form of an O/W gel emulsion.

BACKGROUND ART

In the skincare field, one challenge is to instantly brighten up the skin tone while still achieving a natural finish and a fresh skincare application sensation.

Most commonly, for improving skin brightness in skincare products, pigments such as titanium dioxides are used. Usually, when optical powders such as pigments are introduced into skincare products, they thicken the products and also give a powdery or sticky sensation which is unfavorable for skincare application. This difficulty of application may also lead to inhomogeneous distribution of the powders on the skin leaving traces upon application or resulting in an unnatural finish.

Thus, there is a need for a composition which can provide a fresh application sensation suitable for skincare products and can also brighten up the skin, while providing a homogeneous and natural coverage.

DISCLOSURE OF INVENTION

An objective of the present invention is to provide a composition which can provide a fresh sensation to skin and homogeneous coverage.

The above objective can be achieved by a composition comprising:

(a) at least one silicone oil;

(b) at least one hydrophobic particle;

(c) at least one water-soluble or water-dispersible, crosslinked or non-crosslinked

polymer comprising, at least, acrylamido-2-methylpropanesulfonic acid (AMPS) monomer, in a form partially or totally neutralized with sodium hydroxide; and

(d) water.

It is preferable that the composition be the O/W type, preferably in the form of an O/W gel, and more preferably an O/W gel emulsion.

The (a) silicone oil may be selected from non-volatile silicone oils, preferably non-volatile, non-phenylated silicone oils, and more preferably dimethicones.

The amount of the (a) silicone oil in the composition may be from 0.01% to 30% by weight, preferably from 0.1% to 20% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition. The (b) hydrophobic particle may have been hydrophobically surface-treated, preferably surface-treated with at least one amphiphilic agent, and more preferably surface-treated with at least one hydrophobicized amino acid.

The hydrophobicized amino acid may be a glutamic acid derivative or a condensate of at least one glutamic acid derivative and an amino acid.

The (b) hydrophobic particle may comprise at least one inorganic material, preferably metal oxide, and more preferably titanium oxide.

The amount of the (b) hydrophobic particle in the composition may be from 0.01% to 15% by weight, preferably from 0.1% to 10% by weight, and more preferably from 0.5% to 5% by weight, relative to the total weight of the composition.

The (c) polymer may be selected from the group consisting of:

(i) crosslinked or non-crosslinked AMPS homopolymers;

(ii) crosslinked or non-crosslinked copolymers obtained from AMPS and from one or more hydrophilic ethylenically unsaturated monomers or hydrophobic ethylenically unsaturated monomers not containing a fatty chain; and

(iii) mixtures thereof.

The (c) polymer may be selected from the group consisting of:

an acrylamide/sodium acrylamido-2-methylpropanesulfonate (acrylamide/sodium

acryloyldimethyltaurate) crosslinked copolymer;

a copolymer of AMPS and of vinylpyrrolidone or of vinylformamide;

a copolymer of AMPS and of sodium acrylate (sodium acrylate/sodium

acryloyldimethyltaurate copolymer) ;

a copolymer of AMPS and of hydroxyethyl acrylate; and

a mixture thereof.

The amount of the (c) polymer in the composition may be from 0.01% to 10% by weight, preferably from 0.1% to 5% by weight, and more preferably from 0.3% to 2% by weight, relative to the total weight of the composition.

The amount of the (d) water in the composition may be from 50% to 95% by weight, preferably from 60% to 90% by weight, and more preferably from 70% to 85% by weight, relative to the total weight of the composition.

The composition may comprise at least one surfactant in an amount of 1% by weight or less, 0.5% by weight or less, and more preferably 0.3% by weight or less, relative to the total weight of the composition.

The composition according to the present invention may be a cosmetic composition, preferably a skin cosmetic composition, and more preferably a skincare cosmetic composition.

The present invention also relates to a cosmetic process for a keratin substance, preferably skin, comprising applying to the keratin substance the composition according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION After diligent research, the inventors have discovered that it is possible to provide a composition which can provide a fresh sensation to skin and homogeneous coverage.

Thus, one of the aspects of the present invention relates to a composition comprising:

(a) at least one silicone oil;

(b) at least one hydrophobic particle;

(c) at least one water-soluble or water-dispersible, crosslinked or non-crosslinked

polymer comprising, at least, acrylamido-2-methylpropanesulfonic acid (AMPS) monomer, in a form partially or totally neutralized with sodium hydroxide; and

(d) water.

The composition according to the present invention can provide a fresh sensation to skin and homogeneous coverage.

Since the composition according to the present invention includes water, it can provide a fresh sensation. In particular, when the composition according to the present invention is of the O/W type, it comprises an external aqueous phase which can provide a fresh sensation upon application onto skin, i.e., immediately after contacting the skin.

Since the composition according to the present invention includes at least one hydrophobic particle, it can cover a substrate such as a keratin substance, in particular skin, with a thin layer of the hydrophobic particle. The hydrophobic particle can also brighten the substrate, in particular when the hydrophobic particle is a pigment, preferably hydrophobically surface- treated metal oxide, and more preferably hydrophobically surface-treated titanium dioxide. The homogeneous coverage provided by the composition according to the present invention is useful in realizing a natural finish.

Since the hydrophobic particle will be selectively localized in the silicone oil, it will not disturb the fresh texture provided by the water in the composition according to the present invention. The silicone oil can have good compatibility with the hydrophobic particles, and the hydrophobic particles can be dispersed well in the silicone oil. Therefore, the

hydrophobic particles can form a homogeneous coverage which can contribute to a natural finish. Also, the silicone oil can reduce the powdery sensation and stickiness which may come from the hydrophobic particles.

Due to a combination of the ingredients (a) to (d) in the composition according to the present invention, the composition according to the present invention can provide both an excellent fresh sensation and excellent homogeneous coverage.

Also, the present invention is stable such that it maintains a homogeneous condition for a long period of time. For example, when the composition according to the present invention is of the O/W type, the composition according to the present invention does not cause a phase separation of oil and aqueous phases.

Hereafter, the composition according to the present invention will be described in a detailed manner.

[Composition] (Silicone Oil)

The composition according to the present invention comprises at least one (a) silicone oil. If two or more (a) silicone oils are used, they may be the same or different.

Here,“oil” means a fatty compound or substance which is in the form of a liquid at room temperature (25°C) under atmospheric pressure (760 mmHg). As the silicone oils, those generally used in cosmetics may be used alone or in combination thereof.

Silicone oils suitable for use according to the present invention include, but are not limited to, volatile and non-volatile, cyclic, linear, and branched silicones, optionally modified with organic moieties.

Silicones or organopolysiloxanes are defined, for instance, by Walter NOLL in "Chemistry and Technology of Silicones" (1968), Academic Press. They may be volatile or non-volatile.

When they are volatile, the silicone oils may be chosen from those having a boiling point ranging from 60°C to 260°C, for example:

(i) cyclic polydialkylsiloxanes comprising from 3 to 7, for instance, from 4 to 5 silicon atoms. Non-limiting examples of such siloxanes include octamethylcyclotetrasiloxane marketed, for instance, under the trade name VOLATILE SILICONE® 7207 by UNION CARBIDE and SILBIONE® 70045 V2 by RHODIA, decamethylcyclopentasiloxane marketed under the trade name VOLATILE SILICONE® 7158 by UNION CARBIDE, and SILBIONE® 70045 V5 by RHODIA, as well as mixtures thereof. Cyclomethicones may also be used, for example, those marketed under the references DC 244, DC 245, DC 344, DC 345, and DC 246 by DOW CORNING. Cyclocopolymers of the

dimethylsiloxane/methylalkylsiloxane type may also be used, such as SILICONE

VOLATILE® FZ 3109 marketed by UNION CARBIDE, of formula wherein:

Combinations of cyclic polydialkylsiloxanes with silicon derived organic compounds may also be used, such as an octamethylcyclotetrasiloxane and tetratrimethylsilylpentaerythritol (50/50) mixture, and an octamethylcyclotetrasiloxane and oxy-1,1'-(hexa-2,2,2',2',3,3'- trimethylsilyloxy) bis-neopentane mixture; and (ii) linear volatile polydialkylsiloxanes comprising from 2 to 9 silicon atoms. A nonlimiting example of such a compound is decamethyltetrasiloxane marketed, for instance, under the trade name "SH-200" by TORAY SILICONE. Silicones belonging to this class are also described, for example, in Cosmetics and Toiletries, Vol. 91, Jan. 76, P. 27-32— TODD & BYERS "Volatile Silicone Fluids for Cosmetics".

In at least one embodiment, the silicones may be chosen from non-volatile silicones, such as polydialkylsiloxanes, polyalkylarylsiloxanes, polydiarylsiloxanes, and polyorganosiloxanes modified with the hereabove organofunctional moieties.

According to another embodiment, the silicones are chosen from polydialkylsiloxanes, for example, polydimethylsiloxanes with trimethylsilyl end groups known under the trade name dimethicones.

Non-limiting examples of commercial products corresponding to such polydialkylsiloxanes include:

SILBIONE® fluids of the series 47 and 70 047 and MIRASIL® fluids marketed by RHODIA, for example 70 047 fluid V 500 000;

fluids of the MIRASIL® series marketed by RHODIA;

fluids of the series 200 marketed by DOW CORNING such as DC200, with a viscosity of 60,000 mm ² /s;

VISCASIL® fluids of GENERAL ELECTRIC and some fluids of the SF series (e.g., SF 96 and SF 18) of GENERAL ELECTRIC; and

the fluid marketed under the reference DC 1664 by DOW CORNING.

Polydimethylsiloxanes with dimethylsilanol end groups may also be used, for example, those sold under the trade name dimethiconol (INCI), such as fluids of the 48 series marketed by RHODIA.

Products marketed under the trade names "ABIL Wax® 9800 and 9801" by GOLDSCHMIDT belonging to this class of polydialkylsiloxanes, that are polydialkyl (C ₁ -C ₂₀ ) siloxanes, may also be used.

Polyalkylarylsiloxanes may be chosen from polydimethyl/methylphenylsiloxanes, linear and/or branched polydimethyl/diphenyl siloxanes.

Non-limiting examples of such polyalkylarylsiloxanes include the products marketed under the following trade names:

SILBIONE® fluids of the 70 641 series from RHODIA; RHODORSIL® fluids of the 70 633 and 763 series from RHODIA;

phenyltrimethicone fluid marketed under the reference DOW CORNING 556 COSMETIC GRADE FLUID by DOW CORNING;

PK series silicones from BAYER, for example, the PK20 product;

PN, PH series silicones from BAYER, for example, the PN1000 and PH1000 products; and some SF series fluids from GENERAL ELECTRIC, such as SF 1023, SF 1154, SF 1250, and SF 1265.

Organomodified silicones which may be used according to the present invention include, but are not limited to, silicones such as those previously defined and comprising within their structure at least one organofunctional moiety linked by means of a hydrocarbon group. Organomodified silicones may include, for example, polyorganosiloxanes comprising:

polyethyleneoxy and/or polypropyleneoxy moieties optionally comprising C ₆ -C ₂₄ alkyl moieties, such as products called dimethicone copolyols marketed by DOW CORNING under the trade name DC 1248 and under the trade name DC Q2-5220 and SILWET® L 722, L 7500, L 77, and L 711 fluids marketed by UNION CARBIDE and (C _l2 )alkyl-methicone copolyol marketed by DOW CORNING under the trade name Q2 5200;

optionally substituted amine moieties, for example, the products marketed under the trade name GP 4 Silicone Fluid and GP 7100 by GENESEE and the products marketed under the trade names Q2 8220 and DOW CORNING 929 and 939 by DOW CORNING. Substituted amine moieties may be chosen, for example, from amino C ₁ -C ₄ alkyl moieties.

Aminosilicones may have additional C ₁ -C ₄ alkoxy functional groups, such as those

corresponding to the WACKER BELSIL ADM LOG 1 product;

alkoxylated moieties, such as the product marketed under the trade name "SILICONE

COPOLYMER F-755" by SWS SILICONES and ABIL WAX® 2428, 2434, and 2440 by GOLDSCHMIDT;

hydroxylated moieties, such as hydroxyalkyl function-containing polyorganosiloxanes described, for instance, in French Patent Application No. FR-A-85 163 34;

acyloxyalkyl moieties, for example, the polyorganosiloxanes described in U.S. Pat. No.

4,957,732;

anionic moieties of the carboxylic acid type, for example, the products described in European Patent No. 0 186 507, marketed by CHISSO CORPORATION, and carboxylic alkyl anionic moieties, such as those present in the X-22-3701E product marketed by SHIN-ETSU; 2- hydroxyalkyl sulfonate; and 2-hydroxyalkyl thiosulfate such as the products marketed by GOLDSCHMIDT under the trade names «ABIL® S201» and «ABIL® S255»;

hydroxyacylamino moieties, such as the polyorganosiloxanes described in European Patent Application No. 0 342 834. Anon-limiting example of a corresponding commercial product is the Q2-8413 product marketed by DOW CORNING;

acrylic moieties, such as the products marketed under the names VS80 and VS70 by 3M;

polyamine moieties, and

oxazoline moieties

silicones that may be used according to the present invention may comprise 1 or 2 oxazoline groups; for example, poly(2-methyl oxazoline-b-dimethyl siloxane-b-2-methyl oxazoline) and poly(2-ethyl-2-oxazoline-dimethyl siloxane). The products marketed by KAO under the references OX-40, OS-51, OS-96, and OS-88 may also be used.

The (a) silicone oil may be selected from volatile or non-volatile silicone oils, such as volatile or non-volatile polydimethylsiloxanes (PDMS) containing a linear or cyclic silicone chain, that are liquid or pasty at ambient temperature, in particular cyclopolydimethylsiloxanes (cyclomethicones) such as cyclohexasiloxane; polydimethylsiloxanes containing alkyl, alkoxy, or phenyl groups that are pendent or at the end of the silicone chain, which groups have from 2 to 24 carbon atoms; phenylsilicones such as phenyltrimethicones, phenyldimethicones, phenyltrimethylsiloxydiphenylsiloxanes, diphenyldimethicones,

diphenylmethyldiphenyltrisiloxanes, 2-phenylethyltrimethyl siloxysilicates, and

polymethylphenylsiloxanes; and organomodified silicones such as amodimethicone. It may be preferable that the (a) silicone oil be selected from the group consisting of polydialkylsiloxanes such as polydimethylsiloxanes (PDMS), polyalkylarylsiloxanes such as phenyltrimethicone, polydiarylsiloxanes, and organo-modified polysiloxanes comprising at least one functional moiety chosen from poly(oxyalkylene) moieties, amine moieties, alkoxy moieties, hydroxylated moieties, acyloxyalkyl moieties, carboxylic acid moieties,

hydroxyacylamino moieties, acrylic moieties, polyamine moieties, and oxazoline moieties.

It may be more preferable that the (a) silicone oil may be selected from non-volatile silicone oils, preferably non-volatile, non-phenylated silicone oils, and more preferably dimethicones.

The amount of the (a) silicone oil in the composition according to the present invention may be 0.01% by weight or more, preferably 0.1% by weight or more, and more preferably 1% by weight or more, relative to the total weight of the composition.

The amount of the (a) silicone oil in the composition according to the present invention may be 30% by weight or less, preferably 20% by weight or less and more preferably 10% by weight or less, relative to the total weight of the composition.

The amount of the (a) silicone oil in the composition according to the present invention may be from 0.01% to 30% by weight, preferably from 0.1% to 20% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition.

(Hydrophobic Particle)

The composition according to the present invention comprises at least one (b) hydrophobic particle i.e., a particle which has a hydrophobic surface. If two or more (b) hydrophobic particles are used, they may be the same or different.

The size of the (b) hydrophobic particle may have a number-average particle size of 100 nm or more. The average particle size of the particles may be preferably 150 nm or more, more preferably 200 nm or more, and even more preferably 250 nm or more, and may be preferably 1 μm or less, more preferably 800 nm or less, and even more preferably 500 nm or less. The number-average particle size may be measured by dynamic light scattering with, for example, Nicomp Z380.

The (b) hydrophobic particles are preferably in the form of a solid. More preferably, the particles may be powders. The powders may be pigments and/or fillers.

The pigments that have not been surface-treated, which are referred to hereinbelow as

"pigment", may be an organic pigment. As used herein, the term "organic pigment" means any pigment that satisfies the definition in Ullmann's encyclopedia in the chapter on organic pigments. The organic pigment may be chosen, for example, from nitroso, nitro, azo, xanthene, quinoline, anthraquinone, phthalocyanin, metal complex, isoindolinone, isoindoline, quinacridone, perinone, perylene, diketopyrrolopyrrole, thioindigo, dioxazine,

triphenylmethane, and quinophthalone compounds.

The at least one organic pigment may be chosen, for example, from carmine, carbon black, aniline black, melanin, azo yellow, quinacridone, phthalocyanin blue, sorghum red, the blue pigments codified in the Color Index under the references Cl 42090, 69800, 69825, 73000, 74100, and 74160, the yellow pigments codified in the Color Index under the references Cl 11680, 11710, 15985, 19140, 20040, 21100, 21108, 47000, and 47005, the green pigments codified in the Color Index under the references Cl 61565, 61570, and 74260, the orange pigments codified in the Color Index under the references Cl 11725, 15510, 45370, and 71105, the red pigments codified in the Color Index under the references Cl 12085, 12120, 12370, 12420, 12490, 14700, 15525, 15580, 15620, 15630, 15800, 15850, 15865, 15880, 17200, 26100, 45380, 45410, 58000, 73360, 73915, and 75470, and the pigments obtained by oxidative polymerization of indole or phenolic derivatives as described, for example, in French Patent No. 2 679 771.

These pigments may also be in the form of composite pigments as described, for example, in European Patent No. 1 184 426. These composite pigments may be composed, for instance, of particles comprising an inorganic nucleus at least partially coated with an organic pigment and at least one binder to fix the organic pigments to the nucleus.

Other examples may include pigmentary pastes of organic pigments such as the products sold by the company Hoechst under the names:

Jaune Cosmenyl IOG: Pigment Yellow 3 (Cl 11710);

Jaune Cosmenyl G: Pigment Yellow 1 (Cl 11680);

Orange Cosmenyl GR: Pigment Orange 43 (Cl 71105);

Rouge Cosmenyl R": Pigment Red 4 (Cl 12085);

Carmine Cosmenyl FB: Pigment Red 5 (Cl 12490);

Violet Cosmenyl RL: Pigment Violet 23 (Cl 51319);

Bleu Cosmenyl A2R: Pigment Blue 15.1 (Cl 74160);

Vert Cosmenyl GG: Pigment Green 7 (Cl 74260); and

Noir Cosmenyl R: Pigment Black 7 (Cl 77266).

The at least one pigment may also be chosen from lakes. As used herein, the term "lake" means insolublized dyes adsorbed onto insoluble particles, the assembly thus obtained remaining insoluble during use.

The inorganic substrates onto which the dyes are adsorbed may include, for example, alumina, silica, calcium sodium borosilicate, calcium aluminum borosilicate, and aluminum.

Non-limiting examples of organic dyes include cochineal carmine and the products known under the following names: D&C Red 21 (Cl 45 380), D&C Orange 5 (Cl 45 370), D&C Red 27 (Cl 45 410), D&C Orange 10 (Cl 45 425), D&C Red 3 (Cl 45 430), D&C Red 4 (Cl 15 510), D&C Red 33 (Cl 17 200), D&C Yellow 5 (Cl 19 140), D&C Yellow 6 (Cl 15 985),

D&C Green (Cl 61 570), D&C Yellow 10 (Cl 77 002), D&C Green 3 (Cl 42 053), and D&C Blue 1 (Cl 42 090).

An additional non-limiting example of a lake is the product known under the following name: D&C Red 7 (Cl 15 850:1).

The at least one pigment may also be a pigment with special effects. As used herein, the term "pigments with special effects" means pigments that generally create a non-uniform colored appearance (characterized by a certain shade, a certain vivacity, and/or a certain lightness) that changes as a function of the conditions of observation (light, temperature, observation angles, etc.). They thus contrast with white or colored pigments that afford a standard uniform opaque, semi-transparent, or transparent shade. Two types of pigment with special effects exist: those with a low refractive index, such as fluorescent, photochromic, and thermochromic pigments, and those with a high refractive index, such as nacres and flakes. In particular, pigments with a high refractive index (RI >

1.6) are preferred.

Examples of pigments with special effects include, but are not limited to, nacreous pigments, for instance, white nacreous pigments such as mica coated with titanium or with bismuth oxychloride, colored nacreous pigments such as titanium mica with iron oxides, for example, titanium mica with ferric blue or with chromium oxide, titanium mica with an organic pigment of the above-mentioned type, and also nacreous pigments based on bismuth oxychloride.

The at least one pigment may also be chosen from pigments with an interference effect that are not fixed onto a substrate, for instance, liquid crystals (Helicones HC from Wacker), and holographic interference flakes (Geometric Pigments or Spectra f/x from Spectratek).

Pigments with special effects may also comprise fluorescent pigments, whether these are substances that are fluorescent in daylight or that produce an ultraviolet fluorescence, phosphorescent pigments, photochromic pigments, thermochromic pigments and quantum dots, sold, for example, by the company Quantum Dots Corporation.

Pigments with special effects may also comprise fluorescent pigments, whether these are substances that are fluorescent in daylight or that produce an ultraviolet fluorescence, phosphorescent pigments, photochromic pigments and thermochromic pigments.

The at least one pigment may also be an inorganic pigment, in a preferred embodiment. As used herein, the term "inorganic pigment" means any pigment that satisfies the definition in Ullmann's encyclopedia in the chapter on inorganic pigments. Preferably, inorganic pigments comprise at least one inorganic material. Non-limiting examples of inorganic pigments that are useful in the present invention include metal oxides such as zirconium oxides, cerium oxides, iron oxides, chromium oxides, manganese violet, ultramarine blue, chromium hydrate, ferric blue, and titanium dioxide. The following inorganic pigments may also be used: Ta ₂ O ₅ , Ti ₃ O ₅ , Ti ₂ O ₃ , TiO, and ZrO ₂ as a mixture with TiO ₂ , ZrO ₂ , Nb ₂ O ₅ , CeO ₂ , and ZnS.

In a particular embodiment, the at least one pigment is an inorganic pigment. Preferably, the inorganic pigment is a metal oxide, such as titanium oxide and/or iron oxide.

It is preferable that the (b) hydrophobic particle comprise at least one inorganic material, more preferably a metal oxide, and even more preferably titanium oxide.

The at least one pigment may also be a nacreous pigment such as a white nacreous pigment, for example, mica coated with titanium or with bismuth oxychloride, a colored nacreous pigment such as mica coated with titanium and with iron oxides, mica coated with titanium and, for example, with ferric blue or chromium oxide, mica coated with titanium and with an organic pigment as defined above, and also a nacreous pigment based on bismuth oxychloride. Examples of such pigments may include the Cellini pigments sold by Engelhard (Mica-TiO ₂ - lake), Prestige sold by Eckart (Mica-TiO ₂ ), and Colorona sold by Merck (Mica-TiO _2- Fe ₂ O ₃ ).

In addition to nacres on a mica support, multilayer pigments based on synthetic substrates such as alumina, silica, calcium sodium borosilicate, calcium aluminum borosilicates, and aluminum, may be useful in accordance with the present disclosure.

As used herein, the term "filler" means a substantially uncolored compound that is solid at room temperature and atmospheric pressure, and insoluble in the various ingredients of the cosmetic composition according to the present invention, even when these ingredients are brought to a temperature above room temperature.

The at least one filler may be chosen from mineral and organic fillers, preferably mineral fillers. The at least one filler may be particles of any form, for example, platelet-shaped, spherical, and oblong, irrespective of their crystallographic form (for example lamellar, cubic, hexagonal, and orthorhombic).

Suitable fillers may include fillers with a high refractive index (RI > 1.6).

In particular, the filler may be chosen from boron nitride, barium sulfate, bismuth oxychloride, alumina and composite powders based on titanium oxide and substrate like talc, mica, barium sulfate, boron nitride, bismuth oxychloride and alumina, as well as mixtures thereof.

The filler may preferably be boron nitride. As examples of commercial products of boron nitride, we may use the following products: PUHP3008 from Saint Gobains Ceramics (mean particle size 6μm), the PUHP1030L from Saint Gobain Ceramics (mean particle size 3 μm), the Softouch BN CC6058 powder from Momentive Performance Materials (mean particle size 5- 15μm), or mixtures thereof.

It is preferable that the (b) hydrophobic particle have been hydrophobically surface-treated. It is more preferable that the (b) hydrophobic particle have been surface-treated with at least one amphiphilic agent. The (b) hydrophobic particle may have been partially or fully surface- treated with at least one amphiphilic agent.

The amphiphilic agent may comprise at least one compound chosen from, for example, amino acids; waxes, for example, carnauba wax and beeswax; fatty acids, fatty alcohols and derivatives thereof, such as stearic acid, hydroxystearic acid, stearyl alcohol, hydroxystearyl alcohol, lauric acid and derivatives thereof; anionic surfactants; lecithins; sodium, potassium, magnesium, iron, titanium, zinc or aluminum salts of fatty acids, for example, aluminum stearate or laurate; metal alkoxides; polysaccharides, for example, chitosan, cellulose, and derivatives thereof; polyethylenes; (meth)acrylic polymers, for example, polymethyl methacrylates; polymers and copolymers containing acrylate units; proteins; alkanolamines.

For the purposes of the present invention, the surface treatment is such that a surface-treated pigment conserves its intrinsic pretreatment pigmenting properties and a surface-treated filler conserves its intrinsic pretreatment filling properties. For example, the inorganic substrates such as alumina and silica onto which organic dyes are adsorbed are not surface-treated fillers for the purposes of the present invention.

The particles may be surface-treated with a mixture of amphiphilic agents, and/or may be subjected to several surface treatments with amphiphilic agents.

The surface-treated particles may be prepared according to surface-treatment techniques that are well known to those skilled in the art, or may be commercially available in the required form. Preferably, the surface-treated particles are coated with an organic layer. The organic layer may be deposited on the particles by evaporation of solvent(s), chemical reaction between the molecule(s) in the amphiphilic agent(s) or creation of a covalent bond between the molecule(s) in the amphiphilic agent(s) and the particles.

The surface treatment may thus be performed, for example, by chemical reaction of the amphiphilic agent(s) with the surface of the particles and creation of a covalent bond between the amphiphilic agent(s) and the particles. This method is especially described in USP 4578266.

Particles to which the amphiphilic agent(s) covalently or ionically bond(s) may be preferably used.

The amphiphilic agent(s) may represent from 0.1% to 50% by weight, preferably from 0.5% to 30% by weight, and more preferably 1% to 10% by weight relative to the total weight of the surface-treated particles.

It is preferable that the amphiphilic agent comprises at least one hydrophobicized amino acid. Thus, it is preferable that the (b) hydrophobic particle be surface-treated with at least one hydrophobicized amino acid. The hydrophobicized amino acid may be a glutamic acid derivative or a condensate of at least one glutamic acid derivative and an amino acid.

The glutamic acid derivative may be N-acylated glutamic acid or a salt thereof. As the salt, mention may be made of metal salts, ammonium salts, and onium salts of an organic alkanolamine. As the metal, Na, K, Ba, Zn, Ca, Mg, Fe, Zr, Co, Al and Ti may be used. As the organic alkanolamine, monoethanolamine, diethanolamine, triethanolamine, 2-amino-2- methylpropanol, 2-amino-2-methyl- 1,3 -propanediol and triisopropanolamine may be used. The acyl group bound to the nitrogen atom of the glutamic acid may be derived from a saturated or unsaturated fatty acid having 8 to 22 carbon atoms, such as capric acid, lauric acid, myristic acid, isomyristic acid, palmitic acid, isopalmitic acid, stearic acid, isostearic acid, arachic acid, undecylenic acid, oleic acid, myristic acid, elaidic acid, linolic acid, linoleic acid, arachidonic acid, palm oil fatty acid, beef tallow fatty acid and resin acid (abietic acid).

The condensate of at least one glutamic acid derivative and an amino acid may be a condensate of N-acylated glutamic acid and an amino acid such as lysine, or a salt thereof. As the salt, mention may be made of metal salts, ammonium salts and onium salts of an organic alkanolamine as mentioned above. Sodium salt is preferable. The acyl group bound to the nitrogen atom of the glutamic acid may be derived from a saturated or unsaturated fatty acid having 8 to 22 carbon atoms as mentioned above. Lauric acid is preferable. Thus, for example, sodium dilauramidoglutamide lysine (Pellicer L-30 marketed by Asahi Kasei Chemicals) is preferable as the above condensate.

The amphiphilic surface-treatments of the particles may be chosen from the following treatments:

a PEG-silicone treatment, for instance the AQ surface treatment sold by LCW;

a lauroyllysine treatment, for instance the LL surface treatment sold by LCW;

a lauroyllysine dimethicone treatment, for instance the LL/SI surface treatment sold by LCW; a disodium stearoyl glutamate treatment, for instance the NAI surface treatment sold by Miyoshi;

a dimethicone/disodium stearoyl glutamate treatment, for instance the SA/NAI surface treatment sold by Miyoshi;

a microcrystalline cellulose and carboxymethylcellulose treatment, for instance the AC surface treatment sold by Daito;

an acrylate copolymer treatment, for instance the APD surface treatment sold by Daito;

a sodium dilauramidoglutamide lysine treatment, for instance the ASL treatment sold by Daito; and

a sodium dilauramidoglutamide lysine/isopropyl titanium triisostearate treatment, for instance the ASL treatment sold by Daito.

Amphiphilic agent(s) can be bound to particles ionically with a metal salt or hydroxide whose metal can be selected from Mg, Al, Ca, Zn, for instance, aluminum hydroxide and magnesium chloride.

The treatment by disodium stearoyl glutamate (and) aluminum hydroxide is more preferable.

Other treatments with a sodium dilauramidoglutamide lysine, or a sodium

dilauramidoglutamide lysine/isopropyl titanium triisostearate, are also more preferable.

It may be preferable to use hydrophobically treated titanium dioxide as the (b) hydrophobic particle. Examples of the hydrophobically treated titanium dioxide include the following: Titanium dioxide (and) oxidized polyethylene, sold as PI-TAO-77891, by Miyoshi;

Titanium dioxide (and) stearoyl glutamic acid, sold as TiO ₂ FFP-ASG2/hombitan FF pharma, marketed by Kobo; and

Titanium dioxide surface treated with disodium stearoyl glutamate and aluminum hydroxide (INCI name: Titanium dioxide (and) disodium stearoyl glutamate (and) aluminum hydroxide), sold as NAI- WHITE, NAI-TRI-77891 and NAI-TAO-77891, by Miyoshi.

The amount of the (b) hydrophobic particle in the composition according to the present invention may be 0.01% by weight or more, preferably 0.1% by weight or more, more preferably 0.5% by weight or more, and even more preferably 1% by weight or more, relative to the total weight of the composition.

The amount of the (b) hydrophobic particle in the composition according to the present invention may be 15% by weight or less, preferably 10% by weight or less, more preferably 5% by weight or less, and even more preferably 3% by weight or less, relative to the total weight of the composition.

The amount of the (b) hydrophobic particle in the composition according to the present invention may be from 0.01% to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 0.5% to 5% by weight, and even more preferably from 1% to 3% by weight, relative to the total weight of the composition.

(AMPS Polymer)

The composition according to the present invention comprises at least one (c) water-soluble or water-dispersible, crosslinked or non-crosslinked polymer comprising, at least, acrylamido-2- methylpropanesulfonic acid (AMPS) monomer, in a form partially or totally neutralized with sodium hydroxide. The polymer is hereafter referred to as AMPS polymer. If two or more (c) AMPS polymers are used, they may be the same or different.

The (c) AMPS polymer may be preferably totally neutralized or virtually totally neutralized, i.e., at least 90% neutralized.

The (c) AMPS polymers may be crosslinked or non-crosslinked.

When the AMPS polymers are crosslinked, the crosslinking agents may be selected from among the polyolefmically unsaturated compounds commonly used for the crosslinking of polymers obtained by free-radical polymerization.

Examples of crosslinking agents that may be mentioned include divinylbenzene, diallyl ether, dipropylene glycol diallyl ether, polyglycol diallyl ethers, triethylene glycol divinyl ether, hydroquinone diallyl ether, ethylene glycol or tetraethylene glycol di(meth)acrylate, trimethylolpropane triacrylate, methylenebisacrylamide, methylenebismethacrylamide, triallylamine, triallyl cyanurate, diallyl maleate, tetraallylethylenediamine, tetraallyloxyethane, trimethylolpropane diallyl ether, allyl (meth)acrylate, allylic ethers of alcohols of the sugar series, or other allylic or vinyl ethers of polyfunctional alcohols, and also allylic esters of phosphoric and/or vinylphosphonic acid derivatives, or mixtures of these compounds.

According to one embodiment of the present invention, the crosslinking agent is selected from among methylenebis-acrylamide, allyl methacrylate and trimethylolpropane triacrylate

(TMPTA). The degree of crosslinking generally ranges from 0.01 mol % to 10 mol % and more particularly from 0.2 mol % to 2 mol % relative to the polymer.

The (c) AMPS polymers in accordance with the present invention are water-soluble or water- dispersible. In this case they are:

either

"homopolymers" polymerized from only AMPS monomers and, if they are crosslinked, one or more crosslinking agents such as those defined above;

or

“copolymers” polymerized from AMPS and from one or more hydrophilic or hydrophobic ethylenically unsaturated monomers and, if they are crosslinked, one or more crosslinking agents such as those defined above.

When the said copolymers are polymerized from hydrophobic ethylenically unsaturated monomers, these monomers do not comprise a fatty chain and are preferably present in small amounts. For the purposes of the present invention, the term "fatty chain" means any hydrocarbon-based chain containing at least 7 carbon atoms.

Thus, the (c) AMPS polymer may be selected from the group consisting of:

(i) crosslinked or non-crosslinked AMPS homopolymers;

(ii) crosslinked or non-crosslinked copolymers obtained from AMPS and from one or more hydrophilic ethylenically unsaturated monomers or hydrophobic ethylenically unsaturated monomers not containing a fatty chain; and

(iii) mixtures thereof.

The term "water-soluble or water-dispersible" means polymers which, when introduced into an aqueous phase at 25°C, to a mass concentration equal to 1%, make it possible to obtain a macro scopically homogeneous and transparent solution, i.e., a solution that has a maximum light transmittance value, at a wavelength equal to 500 nm, through a sample 1 cm thick, of at least 60% and preferably of at least 70%.

The "homopolymers" according to the present invention are preferably crosslinked and neutralized, and they may be prepared according to the preparation process comprising the following steps:

(a) the monomer such as AMPS in free form is dispersed or dissolved in a solution of tert-butanol or of water and tert-butanol;

(b) the solution or dispersion of monomer obtained in (a) is neutralized with one or more mineral or organic bases, preferably ammonia NH ₃ , in an amount making it possible to obtain a degree of neutralization of the sulfonic acid functions of the polymer ranging from 90% to 100%;

(c) the crosslinking monomer(s) is(are) added to the solution or dispersion obtained in (b); and

(d) a standard free-radical polymerization is performed in the presence of free-radical initiators at a temperature ranging from 10 to 150°C; the polymer precipitates in the solution or dispersion based on tert-butanol.

The water-soluble or water-dispersible AMPS copolymers according to the present invention may be polymerized from water-soluble ethylenically unsaturated monomers, hydrophobic monomers or mixtures thereof.

The water-soluble comonomers may be ionic or nonionic.

Among the ionic water-soluble comonomers, examples that may be mentioned include the following compounds and the salts thereof:

(meth)acrylic acid,

styrenesulfonic acid,

vinylsulfonic acid and (meth)allylsulfonic acid,

vinylphosphonic acid,

maleic acid,

itaconic acid,

crotonic acid,

the water-soluble vinyl monomers of formula (A) below:

in which:

R ₁ is H, -CH ₃ , -C ₂ H ₅ or -C ₃ H _7;

X ₁ is selected from among:

alkyl ethers of -OR ₂ type in which R ₂ is a linear or branched, saturated or unsaturated hydrocarbon-based radical containing from 1 to 6 carbon atoms, substituted with at least one sulfonic (-SO ₃ -) and/or sulfate (-SO ₄ -) and/or phosphate (-PO ₄ H ₂ -) group. Among the nonionic water-soluble comonomers, examples that may be mentioned include: (meth)acrylamide,

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

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

maleic anhydride,

vinylamine,

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

vinyl alcohol of formula CH ₂ =CHOH,

the water-soluble vinyl monomers of formula (B) below:

in which:

R ₁₅ is H, -CH ₃ , -C ₂ H ₅ or -C ₃ H _7;

X ₂ is selected from among:

alkyl ethers of -OR ₁₆ type in which R ₁₆ is a linear or branched, saturated or unsaturated hydrocarbon-based radical containing from 1 to 6 carbons, optionally substituted with a halogen atom (iodine, bromine, chlorine or fluorine); a hydroxyl group (-OH); ether.

Mention is made, for example, of glycidyl (meth)acrylate, hydroxyethyl methacrylate and (meth)acrylates of ethylene glycol, of diethylene glycol or of polyalkylene glycol.

Among the fatty-chain-free hydrophobic comonomers, examples that may be mentioned include:

styrene and its derivatives, such as 4-butylstyrene, a-methylstyrene and vinyltoluene, vinyl acetate of formula CH ₂ ^_ CH-OCOCH ₃ ;

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;

acrylonitrile,

caprolactone,

vinyl chloride and vinylidene chloride,

silicone derivatives, which provide silicone polymers after polymerization, such as methacryloxypropyltris(trimethylsiloxy)silane and silicone methacrylamides,

the hydrophobic vinyl monomers of formula (C) below:

in which:

R ₂₃ is H, -CH ₃ , -C2H5 or -C ₃ H _7;

X ₃ is selected from among:

alkyl ethers of -OR ₂₄ type in which R ₂₄ is a linear or branched, saturated or unsaturated hydrocarbon-based radical containing from 1 to 6 carbon atoms. Mention is made, for example, of methyl methacrylate, ethyl methacrylate, n-butyl (meth)acrylate, tert-butyl (meth)acrylate, cyclohexyl acrylate, isobomyl acrylate, and 2- ethylhexyl acrylate.

The water-soluble or water-dispersible AMPS polymers of the present invention preferably have a molar mass ranging from 50,000 g/mol to 10,000,000 g/mol, preferably from 80,000 g/mol to 8,000,000 g/mol and even more preferably from 100,000 g/mol to 7,000,000 g/mol. Examples of water-soluble or water-dispersible AMPS homopolymers in accordance with the present invention that may be mentioned include crosslinked or non-crosslinked polymers of sodium acrylamido-2-methylpropanesulfonate, such as the polymer in the commercial product Simulgel 800 (INCI name: Sodium Polyacryloyldimethyltaurate). Examples of water-soluble or water-dispersible AMPS copolymers in accordance with the present invention that may be mentioned include:

acrylamide/sodium acrylamido-2-methylpropanesulfonate crosslinked copolymers, such as the copolymer in the commercial product Sepigel 305 (INCI name: Polyacrylamide/C ₁₃ -C ₁₄ Isoparaffin/Laureth-7) or the copolymer in the commercial product sold under the trademark Simulgel 600 (INCI name: Acrylamide/Sodium Acryloyldimethyltaurate/Isohexadecane/P- olysorbate-80) by SEPPIC;

copolymers of AMPS and of vinylpyrrolidone or of vinylformamide, such as the copolymer in the commercial product sold under the name Aristoflex AV C by Clariant (INCI name:

Ammonium Acryloyldimethyltaurate/V- P Copolymer) but neutralized with sodium hydroxide or potassium hydroxide;

copolymers of AMPS and of sodium acrylate, for instance AMPS/sodium acrylate copolymer such as the copolymer in the commercial product sold under the name Simulgel EG by SEPPIC (INCI name: Sodium Acrylate/Sodium Acryloyldimethyltaurate Copolymer (and) Isohexadecane (and) Polysorbate-80); and

copolymers of AMPS and of hydroxy ethyl acrylate, for instance AMP S/hydroxy ethyl acrylate copolymer, such as the copolymer in the commercial product sold under the name Simulgel NS by SEPPIC (INCI name: Hydroxyethyl acrylate/S odium Acryloyldimethyltaurate copolymer (and) Squalane (and) Polysorbate-60). Thus, it may be preferable that the (c) AMPS polymer be selected from the group consisting of:

an acrylamide/sodium acrylamido-2-methylpropanesulfonate (acrylamide/sodium

acryloyldimethyltaurate) crosslinked copolymer;

a copolymer of AMPS and of vinylpyrrolidone or of vinylformamide;

a copolymer of AMPS and of sodium acrylate (sodium acrylate/sodium

acryloyldimethyltaurate copolymer) ;

a copolymer of AMPS and of hydroxyethyl acrylate; and

a mixture thereof. It may be more preferable that the (c) AMPS polymer be sodium acrylate/sodium

acryloyldimethyltaurate copolymer.

The amount of the (c) AMPS polymer in the composition according to the present invention may be 0.01% by weight or more, preferably 0.1% by weight or more, and more preferably 0.3% by weight or more, relative to the total weight of the composition. The amount of the (c) AMPS polymer in the composition according to the present invention may be 10% by weight or less, preferably 5% by weight or less and more preferably 2% by weight or less, relative to the total weight of the composition.

The amount of the (c) AMPS polymer in the composition according to the present invention may be from 0.01% to 10% by weight, preferably from 0.1% to 5% by weight, and more preferably from 0.3% to 2% by weight, relative to the total weight of the composition.

(Water)

The composition according to the present invention includes (d) water.

The amount of the (d) water in the composition according to the present invention may be 50% by weight or more, preferably 60% by weight or more, and more preferably 70% by weight or more, relative to the total weight of the composition.

The amount of the (d) water in the composition according to the present invention may be 95% by weight or less, preferably 90% by weight or less and more preferably 85% by weight or less, relative to the total weight of the composition.

The amount of the (d) water in the composition according to the present invention may be from 50% to 95% by weight, preferably from 60% to 90% by weight, and more preferably from 70% to 85% by weight, relative to the total weight of the composition.

The (d) water can form an aqueous phase of the composition according to the present invention, if the composition is of the O/W type.

(Surfactant)

The composition according to the present invention may comprise at least one surfactant. If two or more surfactants are used, they may be the same or different.

However, it may be preferable that the amount of the surfactant is small.

The amount of the surfactant may be 1% by weight or less, preferably 0.5% by weight or less, and more preferably 0.3% by weight or less, relative to the total weight of the composition according to the present invention. It is in particular preferable that the composition according to the present invention comprise no surfactant.

(Other Ingredients)

The composition according to the present invention may also include at least one optional or additional ingredient.

The amount of the optional or additional ingredient(s) is not limited, but may be from 0.01% to 30% by weight, preferably from 0.1% to 20% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition according to the present invention. The optional or additional ingredient(s) may be selected from the group consisting of anionic, cationic, nonionic, or amphoteric polymers; non-silicone oils; organic or inorganic UV filters; peptides and derivatives thereof; protein hydrolyzates; swelling agents and penetrating agents; agents for combating hair loss; anti-dandruff agents; natural or synthetic thickeners;

suspending agents; sequestering agents; opacifying agents; dyes; sunscreen agents; vitamins or provitamins; fragrances; preservatives, co-preservatives, stabilizers; and mixtures thereof.

The composition according to the present invention may include one or several cosmetically acceptable organic solvents, which may be alcohols: in particular monovalent alcohols such as ethyl alcohol, isopropyl alcohol, benzyl alcohol, and phenylethyl alcohol; diols such as ethylene glycol, propylene glycol, and butylene glycol; other polyols such as glycerol, sugar, and sugar alcohols; and ethers such as ethylene glycol monomethyl, monoethyl, and monobutyl ethers, propylene glycol monomethyl, monoethyl, and monobutyl ethers, and butylene glycol monomethyl, monoethyl, and monobutyl ethers.

The organic solvent(s) may then be present in a concentration of from 0.01% to 20% by weight, preferably from 0.1% to 15% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition. The pH of the composition according to the present invention may be controlled. The pH may be, for example, from 3 to 11, preferably from 4 to 9, and more preferably from 5 to 7. The pH may be adjusted to the desired value using at least one acidifying agent and/or at least one basifying agent. The acidifying agents can be, for example, mineral or organic acids, for instance hydrochloric acid, orthophosphoric acid, carboxylic acid, for instance tartaric acid, citric acid, lactic acid, or sulphonic acids.

The basifying agent can be, for example, ammonium hydroxide, alkali metal hydroxide, alkali earth metal hydroxide, alkali metal carbonates, alkanolamines such as mono-, di-, and triethanolamines, and also their derivatives, preferably sodium or potassium hydroxide and compounds of the formula below:

wherein

R denotes an alkylene such as propylene optionally substituted by a hydroxyl or a C ₁ -C ₄ alkyl radical, and R _ls R ₂ , R3 _, and R4 independently denote a hydrogen atom, an alkyl radical, or a C ₁ -C ₄ hydroxyalkyl radical, which may be exemplified by l,3-propanediamine and

derivatives thereof. Arginine, urea, and monoethanolamine may be preferable.

The acidifying or basifying agent may be present in an amount ranging from less than 5% by weight, preferably from 1% by weight or less, and more preferably from 0.1% by weight or less, relative to the total weight of the composition. (Form)

It is preferable that the composition according to the present invention be of the O/W type, more preferably in the form of an O/W gel, and even more preferably an O/W gel emulsion. The O/W architecture or structure, which comprises oil phases (or silicone oil phases) dispersed in an aqueous phase, has an external aqueous phase, and therefore products based on the O/W architecture or structure are more pleasant to use because of the feeling of immediate freshness that they can provide.

If the composition according to the present invention is of the O/W type, it comprises silicone oil phases dispersed in a continuous aqueous phase. The dispersed silicone oil phases can be recognized as oil droplets in the aqueous phase.

It may be preferable that the composition according to the present invention of the O/W type be in the form of a fine emulsion, more preferably a nano- or micro-emulsion, and even more preferably a nano-emulsion.

If the composition according to the present invention is of the O/W type, the (b) hydrophobic particles are preferably dispersed in oil phases (or silicone oil phases), and the (c) water- soluble or water-dispersible crosslinked or non-crosslinked polymer is preferably comprised in an aqueous phase.

[Preparation]

The composition according to the present invention can be prepared by mixing the ingredients (a) to (d) as well as optional or additional ingredient(s).

For example, the composition according to the present invention can be prepared by the process comprising:

(i) mixing

(a) at least one silicone oil; and

(b) at least one hydrophobic particle

to obtain a first mixture,

(ii) mixing the first mixture thus obtained in step (i) with

(c) at least one AMPS polymer,

to prepare a second mixture, and

(iii) mixing the second mixture with (d) water.

The mixing step can be performed by any conventional means.

[Use and Process]

The composition according to the present invention may preferably be used as a cosmetic composition, more preferably a skin cosmetic composition, and even more preferably a skincare cosmetic composition.

The composition according to the present invention can provide a fresh sensation and homogeneous coverage.

The composition according to the present invention can also be used for brightening the skin. It should be noted that“brightening” here means making the appearance of the skin natural or healthy, and does not mean whitening of the skin. The skin here encompasses face skin, neck skin, and the scalp. The composition according to the present invention may also be used for mucosae such as the lips, and the like.

The composition according to the present invention can be used as it is (as a topical product), or can be used by being impregnated into a porous substrate such as a non- woven fabric preferably made from cellulose fibers to prepare a cosmetic product such as a cosmetic mask.

In particular, the composition according to the present invention may be intended for application onto a keratin substance such as the skin or lips, preferably the skin. Thus, the composition according to the present invention can be used for a cosmetic process for the skin or lips, preferably the skin.

It is preferable that the composition according to the present invention be used for skincare, not for skin makeup. In other words, it is preferable that the composition according to the present invention be used for skincare products such as a lotion and a cream, not for skin makeup products such as a foundation. Preferably the composition according to the present invention does not comprise iron oxide, or comprise iron oxide in an amount of 0.5% by weight or less, more preferably 0.2% by weight or less, even more preferably 0.1% by weight or less, relative to the total weight of the composition according to the present invention.

The cosmetic process for a keratin substance such as the skin, according to the present invention may comprise, at least, the step of applying onto the keratin substance the composition according to the present invention.

The present invention also relates to the use of

(a) at least one silicone oil;

(b) at least one hydrophobic particle;

(c) at least one water-soluble or water-dispersible, crosslinked or non-crosslinked

polymer comprising, at least, acrylamido-2-methylpropanesulfonic acid (AMPS) monomer, in a form partially or totally neutralized with sodium hydroxide, in a composition comprising (d) water, in order to provide a fresh sensation to the skin, preferably a fresh sensation upon application, and homogeneous coverage.

The present invention may also relate to a cosmetic use of the composition according to the present invention for covering and/or brightening a keratin substance such as the skin, or the use of the composition according to the present invention for the manufacture of a cosmetic product for covering and/or brightening a keratin substance such as the skin.

The cosmetic process or cosmetic use according to the present invention can provide an excellent fresh sensation and homogeneous coverage.

EXAMPLES

The present invention will be described in a more detailed manner by way of examples.

However, these examples should not be construed as limiting the scope of the present invention. The examples below are presented as non-limiting illustrations in the field of the present invention.

[Examples 1-3 and Comparative Examples 1-12] The following compositions according to Examples 1-3 and Comparative Examples 1-12 shown in Tables 1 and 2, were prepared by mixing the ingredients shown in Table 1 as follows. The numerical values for the amounts of the ingredients shown in Tables 1 and 2 are all based on“% by weight” as active raw materials.

Table 2

Compared with the composition according to Example 1, the following modifications were made in the compositions according to Comparative Examples 1-12.

Comparative Example 1: Sodium acrylate/sodium acryloyldimethyl taurate copolymer (SIMULGEL EG) was removed.

Comparative Example 2: Hydrophobically treated titanium dioxide (NAI-TAO-77891) was removed.

Comparative Example 3 : Dimethicone was removed.

Comparative Example 4: Sodium acrylate/sodium acryloyldimethyl taurate copolymer (SIMULGEL EG) was replaced with Carbomer.

Comparative Example 5 : Sodium acrylate/sodium acryloyldimethyl taurate copolymer (SIMULGEL EG) was replaced with Acrylates/C 10-30 Alkyl Acrylate Crosspolymer.

Comparative Example 6: Sodium acrylate/sodium acryloyldimethyl taurate copolymer (SIMULGEL EG) was replaced with xanthan gum.

Comparative Example 7: Sodium acrylate/sodium acryloyldimethyl taurate copolymer (SIMULGEL EG) was replaced with hydroxyethylcellulose.

Comparative Example 8: Dimethicone was replaced by caprylic/capric triglyceride.

Comparative Example 9: Dimethicone was replaced by polybutene.

Comparative Example 10: Dimethicone was replaced by diisostearyl malate.

Comparative Example 11: Hydrophobically treated titanium dioxide (NAI-TAO-77891) was replaced by non-treated titanium dioxide.

Comparative Example 12: Hydrophobically treated titanium dioxide (NAI-TAO-77891) was replaced by hydrophilically-treated titanium dioxide.

[Evaluations]

The compositions according to Examples 1-3 and Comparative Examples 1-12 were evaluated as follows.

(Freshness Upon Application)

Each of the compositions according to Examples 1-3 and Comparative Examples 1-12 was applied to the face of 10 panelists and the fresh sensation was evaluated by scoring from 1 (not fresh: sticky/powdery) to 5 (very fresh: not sticky at all/not powdery at all). The average of the scores was calculated and freshness upon application was categorized in accordance with the following criteria.

Excellent≥ 4

4 > Good≥ 3 3 > Poor

The results are shown in Tables 3-7. (Homogeneous Coverage)

Each of the compositions according to Examples 1-3 and Comparative Examples 1-12 was applied on a black contrast card (ERICHSEN Typ 24/5, Model 451) at 50 um thickness and dried for 10 minutes at room temperature. The image of the application area was then captured by a microscope (Keyence VHX-5000). The aggregated pigments with a size that makes them easily noticeable by the naked eye (larger than 20 um) were detected, and counted (number of aggregates/cm ² ). The homogeneity of coverage was rated in accordance with the following criteria. Excellent < 10

10≤ Good < 30

30≤ Poor

The results are shown in Tables 3-7.

Table 3

Table 4

1 : Phase separation was observed

2: No coverage was observed

Table 5

Table 6

Table 7

According to the sensory evaluation by panelists and the application homogeneity evaluation using image analysis, the compositions according to Examples 1 -3 showed the best

performance in terms of fresh sensation upon application and homogenous coverage.

The composition according to Comparative Example 1, which lacks sodium acrylate/sodium acryloyldimethyl taurate copolymer (SIMULGEL EG), caused phase separation, and therefore, it was not possible to provide an O/W structure.

The composition according to Comparative Example 2, which lacks hydrophobically treated titanium dioxide (NAI-TAO-77891), did not give any coverage on the skin. The compositions according to Comparative Examples 3 to 12 gave inferior performance in terms of homogenous coverage to the compositions according to Examples 1-3. In particular, the compositions according to Comparative Examples 3 and 7-12 were found to cause multiple large aggregates of titanium dioxide pigments due to the bad dispersion of the pigments, and were not able to provide homogenous coverage.

In conclusion, a combination of the silicone oil, the hydrophobic particle and the AMPS polymer showed the best performance for fresh sensation upon application and homogenous coverage. If any one of these essential ingredients is lacking, both fresh sensation upon application and homogenous coverage cannot be provided in the excellent level.