WO2020127733A1

WO2020127733A1 - Washable dispersion of polymer particles dispersed in a nonaqueous medium

Info

Publication number: WO2020127733A1
Application number: PCT/EP2019/086308
Authority: WO
Inventors: Xavier Jalenques; Julien PORTAL; Simon TAUPIN; Laure Ramos-Stanbury
Original assignee: L'oreal
Priority date: 2018-12-21
Filing date: 2019-12-19
Publication date: 2020-06-25
Also published as: FR3090326A1; MX2021007264A; EP3897512A1; FR3090326B1

Abstract

Washable dispersion of polymer particles dispersed in a nonaqueous medium The present invention relates to a dispersion of polymer particles formed from a copolymer of ethyl (meth)acrylate and of (meth)acrylic acid stabilized with a stabilizer based on isobornyl (meth)acrylate polymer in an apolar hydrocarbon-based oil, and also to a composition, preferably a cosmetic composition, comprising such a dispersion.

Description

Title: Washable dispersion of polymer particles dispersed in a nonaqueous medium

Technical field

[0001 ] The present invention relates to a dispersion of polymer particles dispersed in a nonaqueous medium, and also to a cosmetic composition comprising such a dispersion.

[0002] It is known practice to use in cosmetics dispersions of polymer particles of nanometric size, in organic media such as hydrocarbon-based oils, for instance hydrocarbons. Polymers are used notably as film-forming agent in makeup products, such as mascaras, eyeliners, eye shadows or lipsticks, or in

antiperspirant and/or deodorant compositions.

[0003] EP-A-749 747 describes in the examples dispersions in hydrocarbon-based oils (liquid paraffin, isododecane) of acrylic polymers stabilized with

polystyrene/copoly(ethylene-propylene) diblock copolymers.

[0004] WO-A-2010/046 229 describes dispersions in isododecane of acrylic

polymers stabilized with block and notably triblock stabilizing polymers of acrylic monomers.

[0005] WO-A- 2015/091513 describes in the examples a dispersion of methyl

acrylate particles stabilized with a statistical copolymer stabilizer containing 92% isobornyl acrylate and 8% methyl acrylate in isododecane.

[0006] WO-A- 2017/017222 describes in the examples a dispersion of particles of methyl acrylate/ethyl acrylate (50/50 by weight) copolymer, stabilized with a statistical copolymer stabilizer containing 75.2% by weight of isobornyl acrylate, 3% of methyl acrylate, 3% of ethyl acrylate and 18.8% of

monomethacryloyloxypropyl polydimethylsiloxane, in isododecane.

[0007] However, the known dispersions generally have one or more of the

drawbacks mentioned below: they may be difficult to manufacture industrially, or may not have good cosmetic properties. They may, for example, not make it possible to obtain a film with good cosmetic properties, notably good gloss, or may not make it possible to limit the feeling of discomfort after application. In the case of use in an antiperspirant and/or deodorant composition, they may also not prevent/limit the visible and unesthetic marks on clothing, such as white marks, which generally result from the transfer of the antiperspirant substances onto the clothing.

[0008] The known polymer dispersions also have the drawback of not being able to be removed easily, notably with a washing composition, for instance a shower gel. The consequence of this is the formation on the keratin materials, for example under the armpits, of a very thick deposit which may be uncomfortable, and which ends up by coming off in the form of unsightly flakes.

[0009] There is thus a real need for a stable polymer dispersion that is easy to

manufacture industrially, and which makes it possible to obtain a film with good cosmetic properties, notably cosmetic properties (for example good gloss, better sensory nature or reduced transfer onto clothing), which is water-resistant but which can be removed easily by washing with a washing composition such as a shower gel.

Disclosure of the invention

[0010] The Applicant has discovered that novel dispersions of polymer particles

formed with a copolymer of ethyl (meth)acrylate and of (meth)acrylic acid stabilized with a stabilizer based on polymer of isobornyl (meth)acrylate in an apolar hydrocarbon-based oil have good stability, are easy to manufacture industrially without using a large number of synthetic steps, make it possible to obtain a film after application onto keratin support which has good cosmetic properties such as good gloss, good oil resistance, good sensory properties (for example absence of tack), and a good capacity to limit the transfer of the cosmetic active agents onto clothing. These dispersions have the advantage of being water-resistant and of being removed easily by washing with washing composition such as a shower gel.

[0011 ] One subject of the present invention is thus a dispersion of particles of at least one polymer that is surface-stabilized with a stabilizer in a nonaqueous medium containing at least one apolar hydrocarbon-based oil, the polymer of the particles being a copolymer of ethyl (meth)acrylate and of (meth)acrylic acid; the stabilizer being an isobornyl (meth)acrylate polymer chosen from isobornyl (meth)acrylate homopolymer and statistical copolymers of isobornyl (meth)acrylate and of ethyl (meth)acrylate present in an isobornyl (meth)acrylate/ethyl (meth)acrylate weight ratio of greater than 4. For these statistical stabilizing copolymers, the defined weight ratio makes it possible to obtain a polymer dispersion that is stable, notably after storage for seven days at room temperature (25°C).

[0012] Another subject of the invention is a composition comprising, in a

physiologically acceptable medium, a polymer particle dispersion as defined previously, such as an anhydrous aerosol composition comprising, in a physiologically acceptable medium:

a) an oily phase comprising at least one volatile oil A;

b) at least one particular dispersion of polymer particles in a nonaqueous medium according to the invention;

c) at least one cosmetic active agent, notably an antiperspirant agent, a deodorant agent and/or a moisture absorber; and

d) at least one propellant.

[0013] A subject of the invention is also a nontherapeutic cosmetic process for

treating keratin materials, comprising the application to the keratin materials of a composition as defined previously. The treatment process is in particular a process for caring for or making up keratin materials.

[0014] Another subject of the present invention is an aerosol device consisting of a container comprising an anhydrous aerosol composition as defined previously and of a means for dispensing said composition.

Detailed description

Dispersion of particles

[0015] The dispersions according to the invention thus consist of particles, which are generally spherical, of at least one surface-stabilized polymer, in a nonaqueous medium. The dispersions according to the invention are dispersions of polymer particles formed of copolymers of ethyl (meth)acrylate and of (meth)acrylic acid.

In a preferred embodiment, the said copolymers are resulting from the chemical reaction of monomers of ethyl (meth)acrylate with monomers of (meth)acrylic acid only. By the term“only”, it is understood that polymerization is achieved by the reaction of monomers of ethyl (meth)acrylate and of (meth)acrylic acid together, without monomers others than ethyl (meth)acrylate and (meth)acrylic acid.

[0016] A (meth)acrylic acid salt may be used. The salt may be chosen from salts of alkali metals, for example sodium or potassium; salts of alkaline-earth metals, for example calcium, magnesium or strontium; metal salts, for example zinc, aluminum, manganese or copper; ammonium salts of formula NhV; quaternary ammonium salts; salts of organic amines, for instance salts of methylamine, dimethylamine, trimethylamine, triethylamine, ethylamine, 2-hydroxyethylamine, bis(2-hydroxyethyl)amine or tris(2-hydroxyethyl)amine; lysine or arginine salts.

[0017] The polymer of the particles may thus comprise or consist essentially of 70% to 80% by weight of ethyl (meth)acrylate and of 20% to 30% by weight of

(meth)acrylic acid, relative to the total weight of the polymer.

[0018] Advantageously, the polymer of the particles may be chosen from ethyl

acrylate/acrylic acid copolymers. In a particular embodiment of the invention, the said copolymers are resulting from the chemical reaction of monomers of ethyl acrylate with monomers of acrylic acid only. By the term“only”, it is understood that polymerization is achieved by the reaction of monomers of ethyl acrylate and of acrylic acid together, without monomers others than ethyl acrylate and acrylic acid.

[0019] Advantageously, the polymer of the particles is a non-crosslinked polymer.

[0020] The polymer of the particles of the dispersion preferably has a number- average molecular weight ranging from 2000 to 10 000 000 and preferably ranging from 150 000 to 500 000.

[0021 ] The polymer of the particles may be present in the dispersion in a content ranging from 21 % to 58.5% by weight and preferably ranging from 36% to 42% by weight, relative to the total weight of the dispersion.

[0022] The stabilizer is an isobornyl (meth)acrylate polymer chosen from isobornyl (meth)acrylate homopolymer and statistical copolymers of isobornyl

(meth)acrylate and of ethyl (meth)acrylate present in an isobornyl

(meth)acrylate/ethyl (meth)acrylate weight ratio of greater than 4. Advantageously, said weight ratio ranges from 4.5 to 19 and preferentially from 5 to 12. In a particular embodiment of the invention, the said statistical copolymers are resulting from the chemical reaction of isobornyl (meth)acrylate and of ethyl (meth)acrylate monomers only. By the term“only”, it is understood that polymerization is achieved by the reaction of monomers of isobornyl

(meth)acrylate and of ethyl (meth)acrylate together, without monomers others than isobornyl (meth)acrylate and of ethyl (meth)acrylate. In another particular embodiment of the invention, the said statistical copolymers are resulting from the chemical reaction of isobornyl acrylate and of ethyl acrylate monomers only. By the term“only”, it is understood that polymerization is achieved by the reaction of monomers of isobornyl acrylate and of ethyl acrylate together, without monomers others than isobornyl acrylate and of ethyl acrylate. In another particular embodiment of the invention, the said statistical copolymers are resulting from the chemical reaction of isobornyl methacrylate and of ethyl acrylate monomers only. By the term“only”, it is understood that polymerization is achieved by the reaction of monomers of isobornyl methacrylate and of ethyl acrylate together, without monomers others than isobornyl methacrylate and of ethyl acrylate.

[0023] Advantageously, the stabilizer is chosen from:

isobornyl acrylate homopolymers,

isobornyl acrylate/ethyl acrylate statistical copolymers,

isobornyl methacrylate/ethyl acrylate statistical copolymers,

in the weight ratio described previously.

[0024] The stabilizing polymer preferably has a number-average molecular weight ranging from 10 000 to 400 000 and preferably ranging from 20 000 to 200 000.

[0025] The stabilizer is in contact with the surface of the polymer particles and thus makes it possible to stabilize these particles at the surface in order to keep these particles in dispersion in the nonaqueous medium of the dispersion.

[0026] Advantageously, the combination of the stabilizer + polymer of the particles present in the dispersion comprises from 15% to 25% by weight of polymerized isobornyl (meth)acrylate, from 50% to 70% by weight of polymerized ethyl (meth)acrylate and from 15% to 25% by weight of polymerized (meth)acrylic acid, relative to the total weight of the combination of the stabilizer + polymer of the particles.

[0027] Preferentially, the combination of the stabilizer + polymer of the particles

present in the dispersion comprises from 17.5% to 22.5% by weight of

polymerized isobornyl (meth)acrylate, from 55% to 65% by weight of polymerized ethyl (meth)acrylate and from 17.5% to 22.5% by weight of polymerized

(meth)acrylic acid, relative to the total weight of the combination of the stabilizer + polymer of the particles.

Nonaqueous medium of the dispersion

[0028] The oily medium of the polymer dispersion comprises an apolar hydrocarbon- based oil (which is thus formed solely from carbon and hydrogen atoms). The apolar hydrocarbon-based oil is an oil that is liquid at room temperature (25°C).

The apolar hydrocarbon-based oil may be chosen from apolar hydrocarbon- based oils containing from 8 to 14 carbon atoms, and notably:

- branched C8-C14 alkanes, such as C8-C14 isoalkanes of petroleum origin (also known as isoparaffins), such as isododecane (also known as 2, 2, 4,4,6- pentamethylheptane), isodecane and, for example, the oils sold under the Isopar or Permethyl trade names,

- linear alkanes, for instance n-dodecane (C12) and n-tetradecane (C14) sold by Sasol under the respective references Parafol 12-97 and Parafol 14-97, and also mixtures thereof, the undecane-tridecane mixture, the mixtures of n-undecane (C11 ) and of n-tridecane (C13) obtained in examples 1 and 2 of patent

application WO 2008/155 059 from the company Cognis, and mixtures thereof.

[0029] Preferentially, the hydrocarbon-based oil is isododecane.

[0030] The polymer particles of the dispersion preferably have an average size,

notably a number-average size, ranging from 50 to 500 nm, notably ranging from 75 to 400 nm and better still ranging from 100 to 250 nm.

[0031 ] Such oily dispersions are described in patent application WO 2015/091513.

Preparation of the dispersion of polymer particles [0032] In general, the dispersion according to the invention may be prepared in the following manner, which is given as an example.

[0033] The polymerization may be performed in dispersion, i.e. by precipitation of the polymer during formation, with protection of the formed particles with a stabilizer.

[0034] In a first step, the stabilizing polymer is prepared by mixing the constituent monomer(s) of the stabilizing polymer with a free-radical initiator, in a solvent known as the synthesis solvent, and by polymerizing these monomers. In a second step, the constituent monomer(s) of the polymer of the particles are added to the stabilizing polymer formed and polymerization of these added monomers is performed in the presence of the free-radical initiator.

[0035] When the nonaqueous medium is a nonvolatile hydrocarbon-based oil, the polymerization may be performed in an apolar organic solvent (synthesis solvent), followed by adding the nonvolatile hydrocarbon-based oil (which should be miscible with said synthesis solvent) and selectively distilling off the synthesis solvent. A synthesis solvent which is such that the monomers of the stabilizing polymer and the free-radical initiator are soluble therein, and the polymer particles obtained are insoluble therein, so that they precipitate therein during their formation, is thus chosen. In particular, the synthesis solvent may be chosen from alkanes such as heptane or cyclohexane.

[0036] When the nonaqueous medium is a volatile hydrocarbon-based oil, the

polymerization may be performed directly in said oil, which thus also acts as synthesis solvent. The monomers should also be soluble therein, as should the free-radical initiator, and the polymer of the particles which is obtained should be insoluble therein.

[0037] The monomers are preferably present in the synthesis solvent, before

polymerization, in a proportion of 5-35% by weight. The total amount of the monomers may be present in the solvent before the start of the reaction, or part of the monomers may be added gradually as the polymerization reaction proceeds.

[0038] The free-radical initiator may notably be azobisisobutyronitrile or tert- butylperoxy-2-ethyl hexanoate. [0039] The polymerization may be performed at a temperature ranging from 70 to 110°C.

[0040] The polymer particles are surface-stabilized, when they are formed during the polymerization, by means of the stabilizer.

[0041 ] The stabilization may be performed by any known means, and in particular by direct addition of the stabilizer, during the polymerization.

[0042] The stabilizer is preferably also present in the mixture before polymerization of the monomers of the polymer of the particles. However, it is also possible to add it continuously, notably when the monomers of the polymer of the particles are also added continuously.

[0043] From 10% to 30% by weight and preferably from 15% to 25% by weight of stabilizer may be used relative to the total weight of monomers used (stabilizer + polymer of the particles).

[0044] The polymer particle dispersion advantageously comprises from 30% to 65% by weight and preferably from 40% to 60% by weight of solids, relative to the total weight of the dispersion.

[0045] Advantageously, the oily dispersion may comprise a plasticizer chosen from tri-n-butyl citrate, tripropylene glycol monomethyl ether (INCI name: PPG-3 methyl ether) and trimethyl pentaphenyl trisiloxane (sold under the name Dow Corning PH-1555 HRI Cosmetic Fluid by the company Dow Corning). These plasticizers make it possible to improve the mechanical strength of the polymer film.

[0046] The plasticizer may be present in the oily dispersion in a content ranging from 5% to 50% by weight, relative to the total weight of the polymer of the particles.

Composition comprising the dispersion of polymer particles

[0047] The polymer dispersion according to the invention may be used in a

composition comprising a physiologically acceptable medium, in particular in a cosmetic composition.

[0048] The term "physiologically acceptable medium" means a medium that is

compatible with human keratin materials, for instance the skin, the lips, the nails, the eyelashes, the eyebrows or the hair. [0049] The term "cosmetic composition” means a composition that is compatible with keratin materials, which has a pleasant color, odor and feel and which does not cause any unacceptable discomfort (stinging, tautness or redness) liable to discourage the consumer from using it.

[0050] The term "keratin materials" means the skin (body, face, contour of the eyes, scalp), head hair, the eyelashes, the eyebrows, bodily hair, the nails or the lips.

[0051 ] The composition according to the invention may comprise the polymer of the dispersion in a content ranging from 1 % to 50% by weight and preferably ranging from 10% to 45% by weight relative to the total weight of the composition.

Cosmetic adjuvants

[0052] The composition according to the invention may also comprise a cosmetic adjuvant chosen from antiperspirant active agents, deodorant active agents, moisture absorbers, lipophilic suspension or gelling agents, softeners,

antioxidants, opacifiers, stabilizers, moisturizers, vitamins, free-radical

scavengers, polymers, fragrances, preserving agents, fillers, dyestuffs, UV- screening agents, ceram ides or any other ingredient usually used in cosmetics for this type of application.

[0053] Needless to say, a person skilled in the art will take care to select this or these optional additional compounds such that the advantageous properties intrinsically associated with the cosmetic composition in accordance with the invention are not, or are not substantially, adversely affected by the envisaged addition(s).

Antiperspirant active agent

[0054] The term "antiperspirant active agent" means a salt which, by itself, has the effect of reducing the flow of sweat, of reducing the sensation on the skin of moisture associated with human sweat or of masking human sweat.

[0055] The antiperspirant active agent is advantageously chosen from aluminum

and/or zirconium salts or complexes.

[0056] Among the aluminum salts or complexes, mention may be made of aluminum halohydrates.

[0057] Among the aluminum salts, mention may in particular be made of aluminum chlorohydrate, aluminum chlorohydrex, the aluminum chlorohydrex-polyethylene glycol complex, the aluminum chlorohydrex-propylene glycol complex, aluminum dichlorohydrate, the aluminum dichlorohydrex-polyethylene glycol complex, the aluminum dichlorohydrex-propylene glycol complex, aluminum

sesquichlorohydrate, the aluminum sesquichlorohydrex-polyethylene glycol complex, the aluminum sesquichlorohydrex-propylene glycol complex, aluminum sulfate buffered with sodium aluminum lactate.

[0058] Aluminum sesquichlorohydrate is notably sold under the trade name Reach 301® by the company SummitReheis.

[0059] Aluminum chlorohydrate is notably sold under the trade names Locron S

FLA®, Locron P and Locron L.ZA by the company Clariant; under the trade names Microdry aluminum Chlorohydrate®, Micro-Dry 323®, Chlorhydrol 50, Reach 103 and Reach 501 by the company SummitReheis; under the trade name Westchlor 200® by the company Westwood; under the trade name

Aloxicoll PF 40® by the company Guilini Chemie; Cluron 50%® by the company Industria Quimica Del Centro; or Clorohidroxido Aluminio SO A 50%® by the company Finquimica.

[0060] Aluminum chlorohydrate, aluminum sesquichlorohydrate and mixtures thereof will more particularly be used.

[0061 ] The aluminum and/or zirconium salts or complexes may be present in the final composition according to the invention in a content ranging from 1 % to 25% by weight, preferably in a content ranging from 2% to 20% and more particularly between 3% and 15% by weight relative to the total weight of the final

composition.

Deodorant active agents

[0062] According to a particular form of the invention, the composition may contain at least one deodorant active agent in the liquid phase.

[0063] The term "deodorant active agent" means any substance that is capable of reducing, masking or absorbing human body odor, in particular underarm odor.

[0064] The deodorant active agents may be bacteriostatic agents or bactericides that act on underarm odor microorganisms, such as 2,4,4'-trichloro-2'- hydroxydiphenyl ether (Triclosan), 2,4-dichloro-2'-hydroxydiphenyl ether, 3’, 4’, 5’- trichlorosalicylanilide, 1 -(3’,4’-dichlorophenyl)-3-(4’-chlorophenyl)urea (Triclocarban) or 3,7,11-trimethyldodeca-2, 5,10-trienol (Farnesol); quaternary ammonium salts such as cetyltrimethylammonium salts, cetylpyridinium salts, DPTA (1 ,3-diaminopropanetetraacetic acid), 1 ,2-decanediol (Symclariol from the company Symrise); glycerol derivatives, for instance caprylic/capric glycerides (Capmul MCM® from Abitec), glyceryl caprylate or caprate (Dermosoft GMCY® and Dermosoft GMC® from Straetmans), polyglyceryl-2 caprate (Dermosoft DGMC® from Straetmans), and biguanide derivatives, for instance

polyhexamethylene biguanide salts; chlorhexidine and salts thereof; 4-phenyl- 4,4-dimethyl-2-butanol (Symdeo MPP® from Symrise); zinc salts such as zinc salicylate, zinc gluconate, zinc pidolate, zinc sulfate, zinc chloride, zinc lactate or zinc phenolsulfonate; salicylic acid and derivatives thereof such as 5-n- octanoylsalicylic acid.

[0065] The deodorant active agents may be odor absorbers such as zinc

ricinoleates, sodium bicarbonate, sodium hydrogen carbonate, magnesium oxide, magnesium hydroxide, magnesium carbonate; metallic or silver or silver-free zeolites, or cyclodextrins and derivatives thereof. They may also be chelating agents such as Dissolvine GL-47-S® from AkzoNobel, EDTA and DPTA. They may also be a polyol of glycerol or 1 ,3-propanediol type (Zemea Propanediol sold by DuPont Tate and Lyle BioProducts); or else an enzyme inhibitor such as triethyl citrate; or alum.

[0066] The deodorant active agents may also be bacteriostatic agents or

bactericides, 2,4,4'-trichloro-2'-hydroxydiphenyl ether (Triclosan®), 2,4-dichloro- 2'-hydroxydiphenyl ether, 3’,4’,5’-trichlorosalicylanilide, 1 -(3’,4’-dichlorophenyl)-3- (4’-chlorophenyl)urea (Triclocarban®) or 3,7,11 -trimethyldodeca-2, 5,10-trienol (Farnesol®); quaternary ammonium salts such as cetyltrimethylammonium salts or cetylpyridinium salts.

[0067] The deodorant active agents may be present in the composition according to the invention in a proportion of approximately 0.01 % to 20% by weight relative to the total composition, preferably in a proportion of approximately 0.1 % to 10% by weight relative to the total weight of the final composition, preferably from 0.5% to 8% by weight, and preferably in a proportion of approximately 0.7% to 5% by weight relative to the total weight of the final composition. [0068] In a particular embodiment, when the composition according to the invention comprises a deodorant active agent, it also advantageously comprises one or more mineral fillers and/or organic fillers. Fillers that may be mentioned include mineral fillers such as talc or magnesium silicate sold under the name Mistrobond R10C by the company Imerys Talc, kaolin or aluminum silicate, for instance the product sold under the name Kaolin Supreme® by the company Imerys, or organic fillers such as starch, for instance the product sold under the name Amidon de Mais B® by the company Roquette, Nylon microspheres such as those sold under the name Orgasol 2002 UD Nat Cos® by the company

Atochem, microspheres based on expanded vinylidene

chloride/acrylonitrile/methacrylonitrile copolymer containing isobutane, such as the products sold under the name Expancel 551 DE® by the company Expancel. Use will preferably be made more particularly of a talc, such as the product sold under the name Mistrobond R10C by the company Imerys Talc.

[0069] When the composition according to the invention comprises one or more

mineral fillers and/or organic fillers, such as those mentioned above, the total concentration of these fillers ranges from 1 % to 40% by weight relative to the weight of the composition, preferably from 5% to 35% by weight, preferably from 10% to 30% by weight and preferably from 15% to 25% by weight relative to the total weight of the composition.

Moisture absorbers

[0070] The composition according to the invention may also comprise one or more moisture absorbers, for instance perlites and preferably expanded perlites.

[0071 ] The cosmetic composition may comprise one or more moisture absorbers chosen from perlites.

[0072] Preferably, the cosmetic composition comprises one or more absorbers

chosen from expanded perlites.

[0073] The perlites that may be used according to the invention are generally

aluminosilicates of volcanic origin and have the composition:

70.0-75.0% by weight of silica Si02

12.0-15.0% by weight of oxide of aluminum oxide AI203 3.0-5.0% of sodium oxide Na20

3.0-5.0% of potassium oxide K20

0.5-2% of iron oxide Fe203

0.2-0.7% of magnesium oxide MgO

0.5-1.5% of calcium oxide CaO

0.05-0.15% of titanium oxide Ti02.

[0074] The perlite is milled, dried and then calibrated in a first step. The product obtained, known as perlite ore, is gray-colored and has a size of about 100 pm.

[0075] The perlite ore is subsequently expanded (1000°C/2 seconds) to give more or less white particles. When the temperature reaches 850-900°C, the water trapped in the structure of the material evaporates and brings about the expansion of the material, relative to its original volume. The expanded perlite particles in accordance with the invention may be obtained via the expansion process described in patent US 5 002 698.

[0076] Preferably, the perlite particles used will be milled; in this case, they are

known as Expanded Milled Perlite (EMP). They preferably have a particle size defined by a median diameter D50 ranging from 0.5 to 50 pm and preferably from 0.5 to 40 pm.

[0077] Preferably, the perlite particles used have a loose bulk density at 25°C

ranging from 10 to 400 kg/m³ (standard DIN 53468) and preferably from 10 to 300 kg/m³.

[0078] Preferably, the expanded perlite particles according to the invention have a water absorption capacity, measured at the wet point, ranging from 200% to 1500% and preferably from 250% to 800%.

[0079] The wet point corresponds to the amount of water which has to be added to 1 g of particle in order to obtain a homogeneous paste. This method is directly derived from the oil uptake method applied to solvents. The measurements are taken in the same manner by means of the wet point and the flow point, which have, respectively, the following definitions: [0080] wet point: weight expressed in grams per 100 g of product corresponding to the production of a homogeneous paste during the addition of a solvent to a powder;

[0081 ] flow point: weight, expressed in grams per 100 g of product, at and above which the amount of solvent is greater than the ability of the powder to retain it. This is reflected by the production of a more or less homogeneous mixture which flows over the glass plate.

[0082] The wet point and the flow point are measured according to the following

protocol:

[0083] Protocol for measuring the water absorption

1 ) Equipment used

Glass plate (25 x 25 mm)

Spatula (wooden shaft and metal part, 15 x 2.7 mm)

Silk-bristled brush

Balance

2) Procedure

The glass plate is placed on the balance and 1 g of perlite particles is weighed out. The beaker containing the solvent and the liquid sampling pipette is placed on the balance. The solvent is gradually added to the powder, the whole being regularly blended (every 3 to 4 drops) by means of the spatula. The mass of solvent needed to obtain the wet point is noted. Further solvent is added and the mass which makes it possible to reach the flow point is noted. The mean of three tests will be taken. The expanded perlite particles sold under the trade names Optimat 1430 OR or Optimat 2550 by the company World Minerals will be used in particular.

[0084] In one embodiment, the composition according to the invention is an

antiperspirant and/or deodorant composition and comprises at least one cosmetic adjuvant chosen from an antiperspirant, deodorant and/or moisture-absorbing agent such as those described above. [0085] In another embodiment, the composition according to the invention is a makeup composition, in particular a lip makeup composition, a mascara, an eyeliner, an eye shadow or a foundation.

[0086] In another embodiment, the composition according to the invention is a

photoprotective composition and comprises at least one cosmetic adjuvant chosen from UV-screening agents.

[0087] In another embodiment, the composition according to the invention is an

antiaging composition, a moisturizing composition, a matt-effect composition and/or a composition intended for treating greasy skin.

[0088] According to one embodiment, the composition according to the invention is an anhydrous composition. The term "anhydrous composition" means a composition containing less than 2% by weight of water, or even less than 0.5% of water, and is notably free of water. Where appropriate, such small amounts of water may notably be introduced by ingredients of the composition that may contain residual amounts thereof.

[0089] According to one embodiment, the composition according to the invention is an anhydrous composition in aerosol form comprising, notably in a physiologically acceptable medium:

a) an oily phase comprising at least one volatile oil A;

c) at least one cosmetic adjuvant; and

d) at least one propellant.

[0090] According to one embodiment, the composition according to the invention is an anhydrous composition in aerosol form comprising, notably in a physiologically acceptable medium:

a) an oily phase comprising at least one volatile oil A;

b) at least one particular dispersion of polymer particles in a nonaqueous medium according to the invention; c) at least one cosmetic active agent, notably an antiperspirant agent, a deodorant agent and/or a moisture absorber; and

d) at least one propellant.

Oily phase of the composition

[0091 ] The anhydrous composition in aerosol form according to the invention

comprises an oily phase comprising at least one volatile oil A.

[0092] For the purposes of the invention, the term“volatile oil” means an oil that is capable of evaporating on contact with the skin or the keratin fiber in less than one hour, at room temperature and atmospheric pressure.

[0093] The total amount of oil(s) present in the composition of the invention is

preferably in a content ranging from 10% to 90% by weight and more

preferentially in a content ranging from 15% to 80% by weight, even more preferentially in a content ranging from 20% to 60% by weight, relative to the total weight of the liquid phase (or of the fluid).

[0094] For the purposes of the present invention, the term "liquid phase" or "fluid" means the base of the composition without the propellant.

[0095] The volatile oils A of the invention are volatile cosmetic oils, which are liquid at room temperature, having a nonzero vapor pressure, at room temperature and atmospheric pressure, ranging in particular from 0.13 Pa to 40 000 Pa (10^-3 to 300 mmFIg), in particular ranging from 1.3 Pa to 13 000 Pa (0.01 to 100 mmFIg) and more particularly ranging from 1.3 Pa to 1300 Pa (0.01 to 10 mmFIg).

[0096] Preferentially, the volatile oil A is chosen from hydrocarbon-based volatile oils and silicone volatile oils, or mixtures thereof.

[0097] As examples of volatile hydrocarbon-based oils A that may be used in the invention, mention may be made of volatile hydrocarbon-based oils containing from 8 to 16 carbon atoms, such as:

- branched C8-C16 alkanes, such as C8-C16 isoalkanes of petroleum origin (also known as isoparaffins), such as isododecane (also known as 2, 2, 4,4,6- pentamethylheptane), isodecane, isohexadecane and, for example, the oils sold under the Isopar or Permethyl trade names, - linear alkanes, for instance n-dodecane (C12) and n-tetradecane (C14) sold by Sasol under the respective references Parafol 12-97 and Parafol 14-97, and also mixtures thereof, the undecane-tridecane mixture, the mixtures of n-undecane (C11 ) and of n-tridecane (C13) obtained in examples 1 and 2 of patent application WO 2008/155 059 from the company Cognis, and mixtures thereof.

[0098] As examples of volatile silicone oils A that may be used in the invention, mention may be made of:

- volatile linear or cyclic silicone oils, notably those with a viscosity < 8 centistokes (8x10⁶ m²/s) and notably containing from 2 to 7 silicon atoms, these silicones optionally including alkyl or alkoxy groups containing from 1 to 10 carbon atoms. As volatile silicone oils that may be used in the invention, mention may be made notably of octamethylcyclotetrasiloxane,

decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane,

heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane and dodecamethylpentasiloxane;

- the volatile linear alkyltrisiloxane oils of general formula

[Chem. 1 ]

in which R represents an alkyl group containing from 2 to 4 carbon atoms and of which one or more hydrogen atoms may be substituted with one or more fluorine or chlorine atoms.

[0099] Among the oils of general formula (II), mention may be made of:

3-butyl-1 ,1 ,1 ,3,5,5,5-heptamethyltrisiloxane,

3-propyl-1 ,1 ,1 ,3,5,5,5-heptamethyltrisiloxane, and

3-ethyl-1 ,1 ,1 ,3,5,5,5-heptamethyltrisiloxane, corresponding to the oils of the above formula for which R is, respectively, a butyl group, a propyl group or an ethyl group.

[0100] The proportion of volatile oil(s) A relative to the total amount of the oils

preferably ranges from 50% to 100% by weight.

[0101 ] Preferably, the volatile oils A are chosen from hydrocarbon-based oils and more particularly C8-C16 isoalkanes such as isododecane or isohexadecane, or linear C8-C16 alkanes such as an undecane/tridecane mixture. Even more particularly, isododecane will be chosen.

[0102] The oily phase of the composition may also comprise one or more nonvolatile oils chosen from nonvolatile hydrocarbon-based oils and nonvolatile silicone oils.

[0103] The nonvolatile hydrocarbon-based oils that may be used in the invention may be chosen from nonvolatile hydrocarbon-based oils containing from 8 to 16 carbon atoms, such as:

- short-chain esters (containing from 3 to 8 carbon atoms in total) such as ethyl acetate, methyl acetate, propyl acetate or n-butyl acetate;

- hydrocarbon-based oils of plant origin such as triglycerides consisting of fatty acid esters of glycerol, the fatty acids of which may have chain lengths varying from C4 to C24, these chains possibly being linear or branched, and saturated or unsaturated; these oils are notably heptanoic or octanoic acid triglycerides, or alternatively wheatgerm oil, sunflower oil, coconut oil, grapeseed oil, sesame seed oil, corn oil, apricot oil, castor oil, shea oil, avocado oil, olive oil, soybean oil, sweet almond oil, palm oil, rapeseed oil, cottonseed oil, hazelnut oil, macadamia oil, jojoba oil, alfalfa oil, poppy oil, pumpkin oil, marrow oil, blackcurrant oil, evening primrose oil, millet oil, barley oil, quinoa oil, rye oil, safflower oil, candlenut oil, passion flower oil and musk rose oil; shea butter; or else

caprylic/capric acid triglycerides, for instance those sold by the company

Stearinerie Dubois or those sold under the names Miglyol 810®, 812® and 818® by the company Dynamit Nobel;

- synthetic ethers containing from 10 to 40 carbon atoms; - linear or branched hydrocarbons of mineral or synthetic origin, such as petroleum jelly, polydecenes, hydrogenated polyisobutene such as Parleam®, squalane and liquid paraffins, and mixtures thereof;

- synthetic esters such as oils of formula R1 COOR2 in which R1 represents a linear or branched fatty acid residue including from 1 to 40 carbon atoms and R2 represents a notably branched hydrocarbon-based chain containing from 1 to 40 carbon atoms, on the condition that R1 + R2 > 10, for instance purcellin oil

(cetostearyl octanoate), isopropyl myristate, isopropyl palmitate, C12 to C15 alkyl benzoates, hexyl laurate, diisopropyl adipate, isononyl isononanoate, 2- ethylhexyl palmitate, isostearyl isostearate, 2-hexyldecyl laurate, 2-octyldecyl palmitate, 2-octyldodecyl myristate, alkyl or polyalkyl heptanoates, octanoates, decanoates or ricinoleates such as propylene glycol dioctanoate; hydroxylated esters such as isostearyl lactate, diisostearyl malate and 2-octyldodecyl lactate; polyol esters and pentaerythritol esters;

- fatty alcohols that are liquid at room temperature, with a branched and/or unsaturated carbon-based chain containing from 12 to 26 carbon atoms, for instance octyldodecanol, isostearyl alcohol, oleyl alcohol, 2-hexyldecanol, 2- butyloctanol and 2-undecylpentadecanol.

[0104] As examples of additional nonvolatile silicone oils that may be used in the invention, mention may be made of:

- silicone oils, for instance nonvolatile polydimethylsiloxanes (PDMSs);

polydimethylsiloxanes including alkyl, alkoxy or phenyl groups, which are pendant or at the end of a silicone chain, these groups containing from 2 to 24 carbon atoms; phenyl trimethicones, phenyl dimethicones,

phenyltrimethylsiloxydiphenylsiloxanes, diphenyl dimethicones,

diphenylmethyldiphenyltrisiloxanes, and mixtures thereof.

[0105] According to a particular form of the invention, the amount of nonvolatile

polydimethylsiloxane(s) will be at most 10% by weight, relative to the total weight of the oils.

[0106] Preferably, the nonvolatile hydrocarbon-based oils will be chosen from

hydrogenated polyisobutene oils such as Parleam®, ethers such as dicaprylyl ether or PPG-14 butyl ether, fatty acid esters such as isopropyl palmitate, isononyl isononanoate or C12-C15 alkyl benzoates, fatty alcohols such as octyldodecanol, and mixtures thereof.

[0107] Fatty acid esters such as isopropyl myristate, isopropyl palmitate, isononyl isononanoate or C12-C15 alkyl benzoates, and even more particularly isopropyl myristate, will be more preferentially chosen.

[0108] The nonvolatile hydrocarbon-based oil(s) may be present in the liquid phase of the composition in a content ranging from 0% to 50% by weight, relative to the total oils of the composition.

Cosmetic adjuvant

[0109] The anhydrous cosmetic composition in aerosol form according to the

invention comprises one or more cosmetic adjuvants as described above. In one embodiment, the composition according to the invention comprises at least one antiperspirant agent, at least one deodorant agent and/or at least one moisture absorber.

Propellant

[0110] The anhydrous cosmetic composition in aerosol form according to the

invention comprises one or more propellants.

[0111 ] The propellant is chosen from dimethyl ether, volatile hydrocarbons such as propane, isopropane, n-butane, isobutane, n-pentane and isopentane, and mixtures thereof, optionally with at least one chlorohydrocarbon and/or fluorohydrocarbon; among the latter, mention may be made of the compounds sold by the company DuPont de Nemours under the names Freon and Dymel, and in particular monofluorotrichloromethane, difluorodichloromethane, tetrafluorodichloroethane and 1 ,1-difluoroethane, sold notably under the trade name Dymel 152 A® by the company DuPont.

[0112] Use may also be made, as propellant, of carbon dioxide gas, nitrous oxide, nitrogen or compressed air.

[0113] Preferably, the anhydrous cosmetic composition in aerosol form according to the invention comprises a propellant chosen from volatile hydrocarbons. [0114] More preferentially, the propellant is chosen from isopropane, n-butane, isobutane, pentane and isopentane, and mixtures thereof.

[0115] The weight ratio between the liquid phase and the propellant gas varies in a ratio from 5/95 to 50/50, preferably from 10/90 to 40/60 and more preferentially from 15/85 to 30/70.

Suspension agents/gelling agents

[0116] The anhydrous aerosol composition according to the invention may also

contain one or more suspension agents and/or one or more gelling agents. Some of them may perform both functions simultaneously.

[0117] Among the agents that may be used as lipophilic suspension agents and/or gelling agents, mention may be made of clays, in powder form or in oily gel form, it being possible for said clays optionally to be modified, notably modified montmorillonite clays such as hydrophobic-modified bentonites or hectorites, for instance hectorites modified with a C10 to C22 ammonium chloride, for instance hectorite modified with distearyldimethylammonium chloride, for instance the product disteardimonium hectorite (CTFA name) (product of reaction of hectorite and of distearyldimonium chloride) sold under the name Bentone 38 or Bentone Gel by the company Elementis Specialities. Mention may be made, for example, of the product Stearalkonium Bentonite (CTFA name) (product of reaction of bentonite and of quaternary stearalkonium ammonium chloride) such as the commercial product sold under the name Tixogel MP 250® by the company Sud Chemie Rheologicals, United Catalysts Inc.

[0118] Use may also be made of hydrotalcites, in particular hydrophobic modified hydrotalcites, for instance the products sold under the name Gilugel by the company BK Giulini.

[0119] Mention may also be made of fumed silica optionally subjected to a

hydrophobic surface treatment, the particle size of which is less than 1 pm.

Indeed, it is possible to chemically modify the surface of the silica, by chemical reaction generating a reduction in the number of silanol groups present at the surface of the silica. It is notably possible to substitute silanol groups with hydrophobic groups: a hydrophobic silica is then obtained. The hydrophobic groups may be trimethylsiloxyl groups, which are obtained notably by treating fumed silica in the presence of hexamethyldisilazane. Silicas thus treated are known as“silica silylate” according to the CTFA (8th Edition, 2000). They are sold, for example, under the references Aerosil R812 by the company Degussa, Cab-O-Sil TS-530 by the company Cabot, dimethylsilyloxyl or

polydimethylsiloxane groups, which are notably obtained by treating fumed silica in the presence of polydimethylsiloxane or dimethyldichlorosilane. Silicas thus treated are known as“Silica Dimethyl Silylate” according to the CTFA (8th edition, 2000). They are sold, for example, under the references Aerosil R972 and Aerosil R974 by the company Degussa, and Cab-O-Sil TS-610 and Cab-O- Sil TS-720 by the company Cabot.

[0120] The hydrophobic fumed silica in particular has a particle size that may be nanometric to micrometric, for example ranging from about 5 to 200 nm.

[0121 ] According to a particular embodiment of the invention, the suspension agents or gelling agents may be activated with oils such as propylene carbonate or triethyl citrate.

[0122] The amounts of these various constituents that may be present in the

composition according to the invention are those conventionally used in cosmetic compositions, notably in cosmetic compositions for treating perspiration.

Specific compositions.

[0123] In one embodiment, the composition according to the invention comprises:

- an oily phase comprising one or more volatile oils A chosen from volatile hydrocarbon-based oils, and preferably C8-C16 isoalkanes and more particularly isododecane;

- one or more nonvolatile hydrocarbon-based oils, preferably chosen from fatty acid esters, and more particularly isopropyl myristate;

- one or more antiperspirant agents, deodorant agents and/or odor absorbers;

- a dispersion of ethyl acrylate/acrylic acid (74.5/25.5 by weight) copolymer particles stabilized with an isobornyl acrylate/ethyl acrylate (91/9) statistical copolymer stabilizer; and

- one or more propellants. Cosmetic treatment process

[0124] A subject of the invention is also a nontherapeutic cosmetic process for

treating keratin materials, comprising the application to the keratin materials of a composition as defined previously. The treatment process is in particular a process for caring for or making up keratin materials. According to one

embodiment, the invention relates to a cosmetic process for treating human perspiration, and optionally body odor associated with human perspiration, which consists in applying to the surface of the skin an effective amount of the cosmetic composition as described previously. In a particular embodiment, the said cosmetic composition comprises, in a physiologically acceptable medium, a dispersion as described above and, optionally, at least one cosmetic adjuvant chosen from antiperspirant active agents, deodorant active agents, moisture absorbers, lipophilic suspension or gelling agents, softeners, antioxidants, opacifiers, stabilizers, moisturizers, vitamins, free-radical scavengers, polymers, fragrances, preserving agents, fillers, dyestuffs and ceram ides. The application time of the cosmetic composition to the surface of the skin may then range from 0.5 to 10 seconds and preferably from 1 to 5 seconds.

[0125] The cosmetic composition in accordance with the invention may be applied several times to the surface of the skin.

[0126] In one embodiment, the cosmetic treatment process according to the

invention consists in applying to the surface of the armpits an effective amount of a cosmetic composition as described above.

[0127] According to one embodiment, the invention also relates to the use of a

composition as described above for the cosmetic treatment of human

perspiration.

Aerosol device

[0128] Another subject of the present invention is an aerosol device consisting of a container comprising an aerosol composition as defined above and of a means for dispensing said composition.

[0129] The dispensing means, which forms a part of the aerosol device, generally consists of a dispensing valve controlled by a dispensing head, which itself comprises a nozzle via which the aerosol composition is vaporized. The container containing the pressurized composition may be opaque or transparent. It may be made of glass, polymer or metal, optionally coated with a protective varnish coat.

Evaluation of the transfer properties of aerosol compositions

[0130] Measurement of the transfer onto clothing is performed according to the

protocol described below:

The composition to be studied is deposited on an imitation leather article sold under the name Supplale® by the company Idemitsu Technofine, which is bonded to a rigid support. The deposition is performed by spraying the aerosol for 2 seconds at a distance of 15 cm from the support.

After 24 hours, a black cotton fabric, which is dry or which has been sprayed with artificial sweat*, is deposited on the imitation leather article. A pressure of 1 newton is applied with a rotational motion over 1 rotation at a speed of 3.14 cm/sec.

The fabric is scanned with a scanner sold under the name Epson V500 Scanner (16-bits gray setting, resolution 300 dpi).

The gray level of the scans is then analyzed using the ImageJ software which has a gray level ranging from 0 to 255. The higher the gray level value, the stronger the marks. The lower the gray level values, the less transfer there is from the test composition.

[0131 ] The transfer evaluation is also performed by observation of the residual

deposit on the synthetic leather plate:

[0132] The wear property is considered as being very good when the deposit is

unchanged after the fabric has been passed over. It is considered as being good when the deposit is visible after the fabric has been passed over. It is considered as being poor when the deposit is no longer (or only slightly) visible after the fabric has been passed over.

[0133] Composition of the artificial sweat:

[0134] [Table 1 ]

Method for evaluating the washability with shower gel

[0135] The test compositions (in aerosol form) are sprayed from a distance of 15 cm onto a PMMA plate. The deposit is left to dry for 3 hours 30 minutes at 35°C. The deposits undergo two types of test:

- Test 1 : a cleansing cycle with a shower gel comprising 10.5% of sodium laureth sulfate (as active material): the deposit is moistened beforehand with water, and 0.10 g of shower gel is applied uniformly by massaging for 20 seconds. The product is left to act for 20 seconds. The deposit is rinsed off with water with gentle massaging. The plate is left to dry naturally.

- Test 2: a cycle of cleansing with water. Cleansing is performed as in test 1 , but without shower gel and only in the presence of water.

[0136] The invention is illustrated in greater detail in the examples that follow.

[0137] All the percentages of reagents described in the examples are weight

percentages. The amounts of the ingredients are thus expressed as weight percentages relative to the total weight of the composition.

Example

Example 1

[0138] Synthesis of a polymer dispersion according to the invention in isododecane

[0139] In a first step, 315.2 g of isobornyl acrylate, 25 g of ethyl acrylate, 3.4 g of Trigonox 21 , 540 g of isododecane and 360 g of ethyl acetate were placed in a reactor. The isobornyl acrylate/ethyl acrylate mass ratio is 91/9. The mixture was heated to 90°C under argon with stirring. [0140] After 2 hours of reaction, 540 g of isododecane and 360 g of ethyl acetate were added to the reactor feedstock and the mixture was heated to 90°C.

[0141 ] In a second step, a mixture of 921 g of ethyl acrylate, 315 g of acrylic acid, 12.36 g of Trigonox 21 S, 741.6 g of isododecane and 494.4 g of ethyl acetate were added over 2 hours, and the mixture was left to react for 7 hours.

[0142] After reaction, 3 liters of an isododecane/ethyl acetate mixture (60/40

weight/weight) were added and all of the ethyl acetate and part of the isododecane were then evaporated off to obtain a solids content of 45.3% by weight.

[0143] A dispersion in isododecane of ethyl acrylate/acrylic acid (74.5/25.5)

copolymer particles stabilized with an isobornyl acrylate/ethyl acrylate (91/9) statistical copolymer stabilizer was obtained.

[0144] The oily dispersion contains in total (stabilizer + particles) 20% acrylic acid, 60% ethyl acrylate and 20% isobornyl acrylate.

Example 2

[0145] Tests of aerosol formulations comprising the dispersion of Example 1

[0146] The formulations are tested in aerosol form and comprise a base

manufactured according to the process described below and containing the ingredients mentioned in the following table:

[0147] [Table 2]

[0148] (1 ) sold under the trade name Isopropyl myristate by the company BASF

(2) sold under the trade name Isododecane by the company Ineos

(3) sold under the trade name Isopropyl alcohol premium grade by the company Ineos

(4) sold under the trade name Bentone 38VCG by the company Elementis

(5) sold under the trade name Jeffsol propylene carbonate by the company Huntsman

(6) sold under the trade name Reach 103 by the company Summit-Reheis

[0149] The (acrylic acid/isobutyl acrylate/isobornyl acrylate) copolymer used as

comparative is prepared as follows, according to a two-step process in the same reactor:

A medium containing isododecane and the radical initiator of Trigonox T21 S type is poured into the reactor and heated to a reaction temperature of between 60 and 120°C;

A first addition is poured in, over 1 hour, mainly containing isobornyl acrylate in isododecane in the presence of a radical initiator of Trigonox T21 S type at 90°C. The reaction is left for 2 hours at 90°C;

After 2 hours, the second block formed with isobutyl acrylate and acrylic acid is obtained. These monomers are introduced into the reactor mainly containing the isobornyl acrylate homopolymer. The monomers are added in the presence of isododecane and of radical initiator of Trigonox T21 S type. The addition generally lasts 2 hours and is performed on the reaction medium at 90°C. At the end, purification is performed to remove the residual monomers. The polymer is at a solids content of about 50% in the isododecane.

[0150] To prepare the formulations, phase A was mixed with stirring. Phase (B) was introduced slowly into phase (A) and the mixture was then left to swell for five minutes. Phase (C) was introduced into the mixture obtained. The mixture was stirred vigorously until good homogenization was obtained. The aluminum chlorohydrate (phase D) was then added portionwise. Stirring was continued to obtain good homogenization.

[0151 ] The bases thus formulated were packaged in cans and a propellant was added to the above preparations according to the following schemes:

[0152] [Table 3]

[0153] Results regarding the transfer-resistance efficacy

[0154] The aerosol compositions prepared above were sprayed under the conditions described above and the results obtained are described in the table below:

[0155] [Table 4]

[0156] Compositions A and B show good transfer-resistance capacity.

[0157] Results regarding the washability with shower gel

[0158] The aerosol compositions prepared above were sprayed under the conditions described above and the results obtained are described in the table below:

[0159] [Table 5]

[0160] It was found that, in the case of composition A according to the invention, the deposit washes off with shower gel, whereas the deposit of composition B (outside the invention) does not wash off with shower gel. In both cases, the deposits do not wash off with water.

Example 3

[0161 ] Test of a deodorant aerosol formulation

[0162] The formulation tested in aerosol form comprises a base manufactured

according to the process described below and containing the ingredients mentioned in the following table:

[0163] [Table 6]

[0164] (1 ) sold under the trade name Isopropyl myristate by the company BASF

(2) sold under the trade name Isododecane by the company Ineos

(4) sold under the trade name Bentone 38VCG by the company Elementis

(6) sold under the trade name Micronized Zincidone by the company Solabia

(7) sold under the trade name Mistrobond R10C by the company Imerys Talc

[0165] Phase A was mixed with stirring. Phase (B) was introduced slowly into phase (A) and the mixture was then left to swell for five minutes. Phase (C) was introduced into the mixture obtained. The mixture was stirred vigorously until good homogenization was obtained. The zinc PCA and the talc (phase D) were then added portionwise. Stirring was continued to obtain good homogenization.

[0166] [Table 7]

[0167] Results regarding the transfer-resistance efficacy

[0168] The aerosol composition C was sprayed under the conditions described above and the results obtained are described in the table below:

[0169] [Table 8]

[0170] It was found that the transfer-resistance capacity of composition C is good.

[0171 ] Results regarding the washability with shower gel

[0172] The aerosol composition C was sprayed under the conditions described above and the results obtained are described in the table below:

[0173] [Table 9]

[0174] It was found that, in the case of composition C, the deposit washes off with shower gel, but does not wash off with water.

Claims

[Claim 1 ] A dispersion of particles of at least one polymer that is surface- stabilized with a stabilizer in a nonaqueous medium containing at least one apolar hydrocarbon-based oil, the polymer of the particles being a copolymer of ethyl (meth)acrylate and of (meth)acrylic acid; the stabilizer being an isobornyl (meth)acrylate polymer chosen from isobornyl (meth)acrylate homopolymer and statistical copolymers of isobornyl (meth)acrylate and of ethyl (meth)acrylate present in an isobornyl (meth)acrylate/ethyl

(meth)acrylate weight ratio of greater than 4.

[Claim 2] The dispersion as claimed in claim 1 , characterized in that the polymer of the particles comprises from 70% to 80% by weight of ethyl (meth)acrylate and from 20% to 30% by weight of (meth)acrylic acid, relative to the total weight of the polymer.

[Claim 3] The dispersion as claimed in one of the preceding claims,

characterized in that the polymer of the particles is chosen from ethyl acrylate/acrylic acid copolymers.

[Claim 4] The dispersion as claimed in one of the preceding claims,

characterized in that the polymer of the particles is present in a content ranging from 5% to 70% by weight and preferably ranging from 30% to 60% by weight, relative to the total weight of the dispersion.

[Claim 5] The dispersion as claimed in one of the preceding claims,

characterized in that the polymer particles have an average size ranging from 50 to 500 nm, notably ranging from 75 to 400 nm and better still ranging from 100 to 250 nm.

[Claim 6] The dispersion as claimed in one of the preceding claims,

characterized in that the stabilizer is a statistical copolymer of isobornyl (meth)acrylate and of ethyl (meth)acrylate present in an isobornyl

(meth)acrylate/ethyl (meth)acrylate weight ratio of greater than 5.

[Claim 7] The dispersion as claimed in one of the preceding claims,

characterized in that the stabilizer is chosen from:

isobornyl acrylate homopolymers

isobornyl acrylate/ethyl acrylate statistical copolymers,

isobornyl methacrylate/ethyl acrylate statistical copolymers.

[Claim 8] The dispersion as claimed in one of the preceding claims,

characterized in that the combination of the stabilizer + polymer of the particles present in the dispersion comprises from 15% to 25% by weight of polymerized isobornyl (meth)acrylate, from 50% to 70% by weight of polymerized ethyl (meth)acrylate and from 15% to 25% by weight of polymerized (meth)acrylic acid, relative to the total weight of the combination of the stabilizer + polymer of the particles.

[Claim 9] The dispersion as claimed in one of the preceding claims,

characterized in that the hydrocarbon-based oil is chosen from apolar hydrocarbon-based oils containing from 8 to 14 carbon atoms, and is preferably isododecane.

[Claim 10] A composition comprising, in a physiologically acceptable

medium, a dispersion as claimed in one of the preceding claims.

[Claim 11 ] The composition as claimed in the preceding claim,

characterized in that it comprises at least one cosmetic adjuvant chosen from antiperspirant active agents, deodorant active agents, moisture absorbers, lipophilic suspension or gelling agents, softeners, antioxidants, opacifiers, stabilizers, moisturizers, vitamins, free-radical scavengers, polymers, fragrances, preserving agents, fillers, dyestuffs, UV-screening agents and ceram ides.

[Claim 12] The composition as claimed in either of claims 10 and 11 ,

comprising, notably in a physiologically acceptable medium:

a) an oily phase comprising at least one volatile oil A;

b) at least one cosmetic active agent, notably an antiperspirant agent, a deodorant agent and/or a moisture absorber; and

c) at least one polymer dispersion as claimed in one of the preceding claims; and

d) at least one propellant;

said composition being anhydrous and in aerosol form.

[Claim 13] The composition as claimed in either of claims 11 and 12,

characterized in that the antiperspirant active agent is chosen from aluminum and/or zirconium salts or complexes and is preferably aluminum chlorohydrate and/or aluminum sesquichlorohydrate.

[Claim 14] The composition as claimed in either of claims 12 and 13, characterized in that the propellant is chosen from dimethyl ether, volatile hydrocarbons such as n-butane, propane, isopropane, isobutane, pentane and isopentane, and mixtures thereof, optionally with at least one

chlorohydrocarbon and/or fluorohydrocarbon.

[Claim 15] A cosmetic process for treating human perspiration, and

optionally body odor associated with human perspiration, which consists in applying to the surface of the skin an effective amount of the composition as defined in any one of claims 11 to 14.

[Claim 16] A nontherapeutic cosmetic process for treating keratin materials, comprising the application to the keratin materials of a composition

comprising, in a physiologically acceptable medium, a dispersion as claimed in one of the preceding claims and, optionally, at least one cosmetic adjuvant chosen from antiperspirant active agents, deodorant active agents, moisture absorbers, lipophilic suspension or gelling agents, softeners, antioxidants, opacifiers, stabilizers, moisturizers, vitamins, free-radical scavengers, polymers, fragrances, preserving agents, fillers, dyestuffs and ceramides, in particular for caring for or making up keratin materials.

[Claim 17] An aerosol device consisting of a container comprising an

aerosol composition as defined into any one of claims 12 to 14 and of a means for dispensing said aerosol composition.