RU2786173C1 - Washable dispersion of polymer particles dispersed in non-aqueous medium - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a dispersion of polymer particles. A dispersion of particles of at least one polymer for use in cosmetic compositions is claimed, where polymer is stabilized along a surface with a stabilizer, in a non-aqueous medium containing at least one non-polar oil based on hydrocarbons, where polymer contains from 70-80 wt.% of ethyl(meth)acrylate and 20-30 wt.% of (meth)acrylic acid per the total weight of polymer, the stabilizer is selected from isobornil(meth)acrylate homopolymer and statistical copolymers of isobornil(meth)acrylate and ethyl(meth)acrylate present in the weight ratio of isobornil(meth)acrylate/ethyl(meth)acrylate of more than 4, where a combination of stabilizer+polymer contains from 15-25 wt.% of polymerized isobornil(meth)acrylate, 50-70 wt.% of polymerized ethyl(meth)acrylate, and 15-25 wt.% of polymerized (meth)acrylic acid per the total weight of the combination. A composition for cosmetic treatment of the body, a cosmetic method for the treatment of the body for elimination of sweating in a person, a method for non-therapeutic cosmetic treatment of keratin-containing materials, and a device for application of aerosol are also disclosed.

EFFECT: group of inventions provides for stable polymer dispersion.

18 cl, 9 tbl, 3 ex

Description

Technical field

[1] The present invention relates to a dispersion of polymer particles dispersed in a non-aqueous medium, as well as to a cosmetic composition containing such a dispersion.

[2] It is common practice to use in cosmetics dispersions of nanometer-sized polymer particles in organic media such as oils based on hydrocarbons, eg hydrocarbons. In particular, polymers are used as a film-forming agent in make-up products such as mascaras, eyeliners, eye shadows or lipsticks, or in antiperspirant and/or deodorant compositions.

[3] Document EP-A-749 747 describes in the examples dispersions in oils based on hydrocarbons (liquid paraffin, isododecane) of acrylic polymers stabilized with diblock copolymers of polystyrene with an ethylene-propylene copolymer.

[4] WO-A-2010/046229 describes dispersions in isododecane of acrylic polymers stabilized with stabilizing block polymers and in particular triblock polymers of acrylic monomers.

[5] WO-A-2015/091513 describes in the examples a dispersion of methyl acrylate particles stabilized with a random copolymer stabilizer containing 92% isobornyl acrylate and 8% methyl acrylate in isododecane.

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

[7] However, the known dispersions typically suffer from one or more of the following disadvantages: their production on an industrial scale can be difficult, or they may not have the proper cosmetic properties. They may, for example, not be able to provide a film with proper cosmetic properties, in particular with proper gloss, or may not be able to limit discomfort after application. When used in a composition, an antiperspirant and/or a deodorant may also not prevent/limit visible and unaesthetic marks on clothing, such as white marks that typically result from transfer of antiperspirant substances to clothing.

[8] A disadvantage of the known polymer dispersions is also that they are difficult to remove, in particular with the use of a cleaning composition such as a shower gel. The consequence of this is that keratin-containing materials, such as underarms, form very thick deposits that can cause discomfort and eventually flake off in unsightly flakes.

[9] Thus, there is a real need for a stable polymer dispersion that is easy to produce on an industrial scale, and which allows the production of a film with good cosmetic properties, in particular cosmetic properties (for example, with proper gloss, better sensory properties, or reduced transfer on clothing) that is water resistant but can be easily removed using a detergent composition such as shower gel.

Disclosure of invention

[10] Applicants have found that novel dispersions of polymer particles in a non-polar hydrocarbon-based oil, formed from an ethyl (meth)acrylate-(meth)acrylic acid copolymer, which is stabilized by an isobornyl (meth)acrylate polymer-based stabilizer, have good stability, are easily produced on an industrial scale without the use of a large number of synthetic steps, make it possible to obtain a film after application to a keratin base, which has good cosmetic properties, such as proper gloss, high oil resistance, good sensory properties (for example, no stickiness), as well as high ability to limit the transfer of cosmetic active agents to clothing. These dispersions have the advantage that they are water resistant and can be easily removed with a cleaning composition such as a shower gel.

[11] Thus, one object of the present invention is to disperse particles of at least one polymer that is a surface-stabilized stabilizer in a non-aqueous medium containing at least one non-polar hydrocarbon-based oil, wherein the polymer in the particles is an ethyl copolymer. (meth)acrylate and (meth)acrylic acid; wherein the stabilizer is a polymer of isobornyl (meth) acrylate selected from a homopolymer of isobornyl (meth) acrylate and random copolymers of isobornyl (meth) acrylate and ethyl (meth) acrylate present at a weight ratio of isobornyl (meth) acrylate / ethyl (meth) acrylate , which is greater than 4. For these random stabilizing copolymers, a certain weight ratio makes it possible to obtain a polymer dispersion that is stable, in particular after storage for seven days at room temperature (25°C).

[12] Another object of the present invention is a composition containing in a physiologically acceptable medium a previously defined dispersion of polymer particles, such as an anhydrous aerosol composition containing in a physiologically acceptable medium:

a) an oil phase containing at least one volatile oil A;

b) at least one defined dispersion of polymer particles in a non-aqueous medium in accordance with the present invention;

c) at least one cosmetic active, in particular an antiperspirant, a deodorant and/or a desiccant; and

d) at least one propellant.

[13] It is also an object of the present invention to provide a method for the non-therapeutic cosmetic treatment of keratin-containing materials, comprising applying a previously defined composition to keratin-containing materials. The treatment method, in particular, is a method of caring for or applying make-up to keratin-containing materials.

[14] Another object of the present invention is an aerosol application device comprising a container containing the above anhydrous aerosol composition and means for dispensing said composition.

Detailed description

Particle dispersion

[15] Thus, the dispersions of the present invention are composed of particles, which are generally spherical, of at least one surface-stabilized polymer in a non-aqueous medium. The dispersions according to the present invention are dispersions of polymer particles formed from copolymers of ethyl (meth)acrylate and (meth)acrylic acid. In a preferred embodiment, said copolymers are obtained by chemical reaction of only ethyl (meth)acrylate monomers with (meth)acrylic acid monomers. By "only" is meant that the polymerization is achieved by the reaction of ethyl (meth)acrylate and (meth)acrylic acid monomers, without the involvement of monomers other than ethyl (meth)acrylate and (meth)acrylic acid monomers.

[16] A salt of (meth)acrylic acid can be used. The salt may be selected from alkali metal salts such as sodium or potassium; alkaline earth metal salts, for example calcium, magnesium or strontium; metal salts, for example zinc, aluminium, manganese or copper; ammonium salts of the formula NH ₄ ⁺ ; quaternary ammonium salts; salts of organic amines, for example salts of methylamine, dimethylamine, trimethylamine, triethylamine, ethylamine, 2-hydroxyethylamine, bis(2-hydroxyethyl)amine or tris(2-hydroxyethyl)amine; salts of lysine or arginine.

[17] Thus, the particulate polymer may contain or essentially consist of 70-80% by weight of ethyl (meth)acrylate and 20-30% by weight of (meth)acrylic acid relative to the total weight of the polymer.

[18] Advantageously, the particulate polymer can be selected from copolymers of ethyl acrylate and acrylic acid. In a certain embodiment of the present invention, these copolymers are obtained by chemical reaction of only ethyl acrylate monomers with acrylic acid monomers. By "only" is meant that polymerization is achieved by the reaction of ethyl acrylate and acrylic acid monomers, without the participation of monomers other than ethyl acrylate and acrylic acid monomers.

[19] Advantageously, the particulate polymer is a non-crosslinked polymer.

[20] The polymer in the dispersion particles preferably has a number average molecular weight that is in the range of 2,000 to 1,000,000 and more preferably 150,000 to 500,000.

[21] The particulate polymer may be present in the dispersion in an amount ranging from 21% to 58.5% by weight and preferably from 36% to 42% by weight relative to the total weight of the dispersion.

[22] The stabilizer is an isobornyl (meth) acrylate polymer selected from isobornyl (meth) acrylate homopolymer and isobornyl (meth) acrylate and ethyl (meth) acrylate random copolymers present at a weight ratio of isobornyl (meth) acrylate/ethyl (meth) acrylate, which is greater than 4. Preferably, said weight ratio is in the range from 4.5 to 19 and preferably from 5 to 12. In a certain embodiment of the present invention, these random copolymers are obtained by chemical reaction of only isobornyl (meth)acrylate monomers with ethyl monomers. (meth)acrylate. By "only" is meant that polymerization is achieved by reacting isobornyl (meth)acrylate monomers with ethyl (meth)acrylate monomers, without the participation of monomers other than isobornyl (meth)acrylate and ethyl (meth)acrylate monomers. In another particular embodiment of the present invention, said random copolymers are obtained by chemically reacting only isobornyl acrylate monomers with ethyl acrylate monomers. By "only" is meant that the polymerization is achieved by the reaction of isobornyl acrylate monomers with ethyl acrylate monomers, without the participation of monomers other than isobornyl acrylate and ethyl acrylate monomers. In another particular embodiment of the present invention, said random copolymers are obtained by chemically reacting only isobornyl methacrylate monomers with ethyl acrylate monomers. By "only" is meant that the polymerization is achieved by reacting isobornyl methacrylate monomers with ethyl acrylate monomers, without the participation of monomers other than isobornyl methacrylate and ethyl acrylate monomers.

[23] Advantageously, the stabilizer is selected from:

isobornyl acrylate homopolymers,

random copolymers of isobornyl acrylate and ethyl acrylate,

random copolymers of isobornyl methacrylate and ethyl acrylate,

at the weight ratio described earlier.

[24] The stabilizing polymer preferably has a number average molecular weight in the range of 10,000 to 400,000, and more preferably 20,000 to 200,000.

[25] The stabilizer is in contact with the surface of the polymer particles and thus provides stabilization of these particles on the surface to keep these particles in dispersion in a non-aqueous dispersion medium.

[26] Advantageously, the stabilizer+particulate polymer combination present in the dispersion contains 15% to 25% by weight of polymerized isobornyl (meth)acrylate, 50% to 70% by weight of polymerized ethyl (meth)acrylate, and 15% to 25% by weight polymerized (meth)acrylic acid based on the total weight of the stabilizer+polymer combination in particles.

[27] Preferably, the stabilizer+particulate polymer combination present in the dispersion contains 17.5% to 22.5% by weight of polymerized isobornyl (meth)acrylate, 55% to 65% by weight of polymerized ethyl (meth)acrylate, and 17.5% to 22.5% by weight of polymerized (meth)acrylic acid, based on the total weight of the stabilizer+polymer combination in the particles.

Non-aqueous dispersion medium

[28] The oil medium of the polymer dispersion contains a non-polar oil based on hydrocarbons (thus formed only from carbon and hydrogen atoms). A non-polar hydrocarbon based oil is an oil that is liquid at room temperature (25°C).

The non-polar hydrocarbon-based oil may be selected from non-polar hydrocarbon-based oils containing from 8 to 14 carbon atoms, in particular from:

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

- linear alkanes, e.g. n-dodecane (C12) and n-tetradecane (C14), available from Sasol under the respective names Parafol 12-97 and Parafol 14-97, and mixtures thereof, undecane-tridecane mixtures, n-undecane mixtures ( C11) and n-tridecane (C13) obtained in examples 1 and 2 of patent application WO 2008/155059 from Cognis, and mixtures thereof.

[29] Preferably, the hydrocarbon oil is isododecane.

[30] The polymer particles of the dispersion preferably have an average size, in particular a number average size, in the range of 50 to 500 nm, in particular in the range of 75 to 400 nm, and even better in the range of 100 to 250 nm.

[31] Such oil dispersions are described in patent application WO 2015/091513.

Obtaining a dispersion of polymer particles

[32] In general, the dispersion according to the present invention can be obtained by the method described below, which is given as an example.

[33] The polymerization can be carried out in dispersion, ie, by precipitation of the polymer during formation, with the formed particles protected by a stabilizer.

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

[35] If the non-aqueous medium is a fixed hydrocarbon-based oil, then polymerization can be carried out in a non-polar organic solvent (synthesis solvent) followed by the addition of a fixed hydrocarbon-based oil (which must be miscible with said synthesis solvent) and selective distillation of the solvent for synthesis. Thus, a synthesis solvent is chosen which is such that the monomers of the stabilizing polymer and the free radical initiator are soluble in it, and the resulting polymer particles are insoluble in it, so that they precipitate out of it during their formation. In particular, the synthesis solvent may be selected from alkanes such as heptane or cyclohexane.

[36] If the non-aqueous medium is a hydrocarbon-based volatile oil, polymerization can be carried out directly in said oil, which thus also functions as a synthesis solvent. The monomers must also be soluble in it, as is the free radical polymerization initiator, and the resulting polymer in particles must be insoluble in it.

[37] The monomers are preferably present in the synthesis solvent prior to polymerization in a proportion of 5-35% by weight. The total amount of monomers may be present in the solvent prior to the start of the reaction, or a portion of the monomers may be added gradually as the polymerization reaction progresses.

[38] The free radical initiator may be, in particular, azo-bis-isobutyronitrile or tert-butylperoxy-2-ethylhexanoate.

[39] the Polymerization can be carried out at a temperature in the range from 70 to 110°C.

[40] The polymer particles are stabilized on the surface when they are formed during polymerization, using a stabilizer.

[41] Stabilization can be carried out by any known methods and, in particular, by direct addition of a stabilizer during polymerization.

[42] Preferably, a stabilizer is also present in the mixture prior to polymerization of the polymer monomers in the particles. However, it can also be added continuously, in particular if the polymer monomers in the particles are also added continuously.

[43] From 10% to 30% by weight and preferably from 15% to 25% by weight of the stabilizer can be used, based on the total weight of the monomers used (stabilizer+particulate polymer).

[44] The dispersion of polymer particles preferably contains from 30% to 65% by weight and preferably from 40% to 60% by weight of solids relative to the total weight of the dispersion.

[45] Advantageously, the oil dispersion may contain a plasticizer selected from tri-n-butyl citrate, tripropylene glycol monomethyl ether (INCI name: PPG-3 methyl ether), and trimethylpentaphenyltrisiloxane (sold under the name Dow Corning PH-1555 HRI Cosmetic Fluid by Dow Corning). These plasticizers improve the mechanical strength of the polymer film.

[46] The plasticizer may be present in the oil dispersion in an amount ranging from 5% to 50% by weight relative to the total weight of the polymer in the particles.

Composition containing a dispersion of polymer particles

[47] The polymer dispersion according to the present invention can be used in a composition containing a physiologically acceptable medium, in particular in a cosmetic composition.

[48] The term "physiologically acceptable environment" means an environment that is compatible with human keratin-containing materials, such as skin, lips, nails, eyelashes, eyebrows or hair.

[49] The term "cosmetic composition" means a composition that is compatible with keratin-containing materials, that exhibits a pleasant color, smell, and feel, and that does not cause unacceptable discomfort (burning, tightness, or redness) that can deter the consumer from using it.

[50] The term "keratin-containing materials" means skin (body, face, eye contour, scalp), head hair, eyelashes, eyebrows, body hair, nails or lips.

[51] The composition according to the present invention may contain the polymer dispersion in an amount ranging from 1% to 50% by weight and preferably from 10% to 45% by weight relative to the total weight of the composition.

Cosmetic excipients

[52] The composition according to the present invention may also contain a cosmetic adjuvant selected from antiperspirant actives, deodorant actives, desiccants, lipophilic suspending agents or gelling agents, emollients, antioxidants, opacifiers, stabilizers, humectants, vitamins, free radical scavengers, polymers, perfumes, preservatives, fillers, coloring agents, UV protection agents, ceramides or any other ingredients commonly used in cosmetics of this type of application.

[53] Of course, one skilled in the art will take care to select this or these optional additional substances in such a way that the beneficial properties inherent in the cosmetic composition in accordance with the present invention are not significantly impaired due to the intended additive(s) .

Antiperspirant active agent

[54] The term "antiperspirant active" means a salt that, by itself, has the effect of reducing the flow of sweat, reducing the skin's feel of moisture associated with human sweat, or masking human sweat.

[55] The antiperspirant active is preferably selected from aluminum and/or zirconium salts or complexes.

[56] Among aluminum salts or complexes, aluminum halide should be mentioned.

[57] Among the aluminum salts, in particular, aluminum chlorohydrex, aluminum chlorhydrex, aluminum chlorhydrex-polyethylene glycol complex, aluminum chlorhydrex-propylene glycol complex, aluminum dichlorohydrate, aluminum dichlorohydrex-polyethylene glycol complex, aluminum dichlorohydrex-propylene glycol complex, aluminum sesquichlorohydrate, sesquichlorhydrex complex aluminum-polyethylene glycol, aluminum-propylene glycol sesquichlorohydrex complex, aluminum sulfate buffered with sodium aluminum lactate.

[58] Aluminum sesquichloride is specifically sold under the trade name Reach 301® by SummitReheis.

[59] Aluminum chlorohydrate is specifically sold under the tradenames Locron S FLA®, Locron P and Locron L.ZA by Clariant; under the trade names Microdry aluminum Chlorohydrate®, Micro-Dry 323®, Chlorhydrol 50, Reach 103 and Reach 501 by SummitReheis; under the trade name Westchlor 200® by Westwood; under the trade name Aloxicoll PF 40® by Guilini Chemie; Cluron 50%® by Industria Quimica Del Centro; or Clorohidroxido Aluminio SO A 50%® by Finquimica.

[60] More preferably, aluminum chlorohydrate, aluminum sesquichlorohydrate and mixtures thereof will be used.

[61] Salts or complexes of aluminum and/or zirconium may be present in the final composition in accordance with the present invention in an amount ranging from 1% to 25% by weight, preferably in an amount ranging from 2% to 20%, and more preferably from 3% to 15% by weight relative to the total weight of the final composition.

Deodorizing active agents

[62] In accordance with a certain embodiment of the present invention, the composition may contain at least one deodorant active agent in the liquid phase.

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

[64] The deodorant actives can be bacteriostatic agents or bactericides that act on microorganisms that cause underarm odor, 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 Symrise), glycerol derivatives such as caprylic/capric glycerides (Capmul MCM® from Abitec ), glyceryl caprylate or α-caprate (Dermosoft GMCY® and Dermosoft GMC® from Straetmans), polyglyceryl-2-caprate (Dermosoft DGMC® from Straetmans), and biguanide derivatives, for example polyhexamethylene biguanide salts; chlorhexidine and its salts; 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 its derivatives such as 5-n-octanoylsalicylic acid.

[65] The deodorant actives can be odor absorbers such as zinc ricinoleates, sodium bicarbonate, sodium hydrogen carbonate, magnesium oxide, magnesium hydroxide, magnesium carbonate; metal-containing, or silver-containing, or silver-free zeolites, or cyclodextrins and their derivatives. They can also be chelating agents such as Dissolvine GL-47-S® from AkzoNobel, EDTA and DPTA. They may also be a glycerol or 1,3-propanediol type polyol (Zemea Propanediol sold by Dupont Tate and Lyle BioProducts); or also an enzyme inhibitor such as triethyl citrate; or alum.

[66] The deodorant actives can be bacteriostatic agents or bactericides 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 or cetylpyridinium salts.

[67] Deodorizing actives may be present in the composition of the present invention in a proportion of from about 0.01% to 20% by weight of the total composition, preferably in a proportion of from about 0.1% to 10% by weight. relative to the total weight of the final composition, more preferably from 0.5% to 8% by weight and more preferably from about 0.7% to 5% by weight relative to the total weight of the final composition.

[68] In a certain embodiment, if the composition according to the present invention contains a deodorant active, it also advantageously contains one or more mineral 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 Imerys Talc, kaolin or aluminum silicate such as the product sold under the name Kaolin Supreme® by Imerys, or organic fillers such as starch, e.g. the product sold under the name Amidon de Maïs B® by Roquette, nylon microspheres such as those sold under the name Orgasol 2002 UD Nat Cos® by Atochem, microspheres based on an expanded copolymer of vinylidene chloride, acrylonitrile and methacrylonitrile containing isobutane , such as the products sold under the name Expancel 551 DE® by Expancel. In particular, the use of talc, such as the product sold under the name Mistrobond R10C by Imerys Talc, will be preferred.

[69] If the composition in accordance with the present invention contains one or more mineral and/or organic fillers, such as those mentioned above, the total concentration of these fillers is in the range from 1% to 40% by weight relative to the weight of the composition, preferably from 5% to 35% by weight, more preferably 10% to 30% by weight, and even more preferably 15% to 25% by weight relative to the total weight of the composition.

Dehumidifiers

[70] the Composition in accordance with the present invention may also contain one or more desiccant, for example, perlite and preferably expanded perlite.

[71] The cosmetic composition may contain one or more desiccants selected from perlites.

[72] Preferably, the cosmetic composition contains one or more desiccants selected from expanded perlites.

[73] Perlites that can be used in accordance with the present invention are, as a rule, aluminosilicates of volcanic origin and have the following composition:

70.0-75.0% by weight of silicon dioxide SiO2;

12.0-15.0% by weight of aluminum oxide Al2O3;

3.0-5.0% sodium oxide Na2O;

3.0-5.0% potassium oxide K2O;

0.5-2% iron oxide Fe2O3;

0.2-0.7% magnesium oxide MgO;

0.5-1.5% calcium oxide CaO;

0.05-0.15% titanium oxide TiO2.

[74] Perlite is crushed, dried and then sized in the first step. The resulting product, known as perlite ore, is gray in color and about 100 µm in size.

[75] Then, the perlite ore is puffed (1000°C/2 seconds) to obtain more or less white particles. When the temperature reaches 850-900°C, the water retained in the structure of the material evaporates, causing the material to expand from its original volume. Expanded perlite particles in accordance with the present invention can be obtained using the expansion method described in US patent No. 5002698.

[76] Preferably, the perlite particles used may be pulverized; they are then known as expanded ground perlite (EMP). They preferably have a particle size defined by a median diameter D50 ranging from 0.5 to 50 µm and preferably from 0.5 to 40 µm.

[77] Preferably, the perlite particles used have a free bulk density at 25°C ranging from 10 to 400 kg/m ³ (DIN 53468 standard) and preferably from 10 to 300 kg/m ³ .

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

[79] The wetting point corresponds to the amount of water that must be added to 1 g of particles to obtain a homogeneous paste. This method is directly based on the oil absorption method used for solvents. The measurements are carried out in the same way, by means of the wet point and the pour point, which have, respectively, the following definitions:

[80] wetting point: weight, expressed in grams per 100 g of product, corresponding to the production of a homogeneous paste during the addition of the solvent to the powder;

[81] Pour Point: The weight, expressed in grams per 100 g of product, at and above which the amount of solvent is greater than the powder's holding capacity. This is reflected in a more or less homogeneous mixture which flows over the glass plate.

[82] Wetting point and pour point are measured according to the following protocol.

[83] Protocol for measuring water absorption

1) Equipment used

Glass plate (25 × 25 mm)

Spatula (wooden handle and metal part, 15 × 2.7 mm)

Soft bristle brush

Scales

2) Procedure

The glass plate is placed on a balance and 1 g of perlite particles are weighed. A beaker containing the solvent is placed on the balance and a pipette is placed to collect the liquid. The solvent is gradually added to the powder, the whole mass is regularly mixed (every 3-4 drops) with a spatula. Record the mass of solvent required to reach the wetting point. Add more solvent and note the weight needed to reach the pour point. Determine the average value of the three tests. In particular, expanded perlite particles sold under the trade names Optimat 1430 OR or Optimat 2550 by World Minerals can be used.

[84] In one embodiment, the composition according to the present invention is an antiperspirant and/or deodorant composition and contains at least one cosmetic adjuvant selected from an antiperspirant, deodorant and/or humectant, such as those described previously.

[85] In another embodiment, the composition according to the present invention is a makeup composition, in particular a lip makeup composition, mascara, eyeliner, eye shadow or makeup base.

[86] In another embodiment, the composition according to the present invention is a sunscreen composition and contains at least one cosmetic excipient selected from UV protection agents.

[87] In another embodiment, the composition according to the present invention is an anti-aging composition, a moisturizing composition, a mattifying composition, and/or a composition for treating oily skin.

[88] In accordance with one embodiment, the composition in accordance with the present 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% water and, in particular, does not contain water. In appropriate cases, such small amounts of water may, in particular, be introduced together with the ingredients of the composition, which may contain residual amounts of it.

[89] In accordance with one embodiment, the composition in accordance with the present invention is an anhydrous composition in aerosol form, containing, in particular, in a physiologically acceptable medium:

a) an oil phase containing at least one volatile oil A;

b) at least one defined dispersion of polymer particles in a non-aqueous medium in accordance with the present invention;

c) at least one cosmetic excipient; and

d) at least one propellant.

[90] In accordance with one embodiment, the composition in accordance with the present invention is an anhydrous composition in aerosol form, containing, in particular, in a physiologically acceptable medium:

a) an oil phase containing at least one volatile oil A;

b) at least one defined dispersion of polymer particles in a non-aqueous medium in accordance with the present invention;

c) at least one cosmetic active, in particular an antiperspirant, a deodorant and/or a desiccant; and

d) at least one propellant.

Oil phase of the composition

[91] Anhydrous composition in aerosol form according to the present invention contains an oil phase containing at least one volatile oil A.

[92] For the purposes of the present invention, the term "volatile oil" means an oil that is capable of volatilization upon contact with the skin or keratin fiber for less than one hour, at room temperature and atmospheric pressure.

[93] The total amount of oil(s) present in the composition according to the present invention is preferably in the range of 10% to 90% by weight, more preferably in the range of 15% to 80% by weight, and more preferably 20% to 60% by weight relative to the total weight of the liquid phase (or fluid).

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

[95] Volatile oils A according to the present invention are volatile cosmetic oils that are liquid at room temperature and whose vapor pressure is non-zero at room temperature and atmospheric pressure, and in particular is in the range of 0.13 Pa to 40,000 Pa (10 ⁻³ to 300 mmHg), in particular in the range of 1.3 Pa to 13,000 Pa (0.01 to 100 mmHg), and more specifically in range from 1.3 Pa to 1300 Pa (from 0.01 to 10 mmHg).

[96] Advantageously, volatile oil A is selected from hydrocarbon-based volatile oils and silicone volatile oils, or mixtures thereof.

[97] As examples of volatile oils A based on hydrocarbons that can be used in the present invention, volatile oils based on hydrocarbons containing from 8 to 16 carbon atoms, such as:

- branched C8-C16 alkanes, e.g. petroleum derived C8-C16 isoalkanes (also known as isoparaffins), such as isododecane (also known as 2,2,4,4,6-pentamethylheptane), isodecane and e.g. the names Isopar or Permethyl,

- linear alkanes, e.g. n-dodecane (C12) and n-tetradecane (C14), available from Sasol under the respective names Parafol 12-97 and Parafol 14-97, and mixtures thereof, undecane-tridecane mixture, n-undecane mixtures ( C11) and n-tridecane (C13) obtained in examples 1 and 2 of patent application WO 2008/155059 from Cognis, and mixtures thereof.

[98] As examples of volatile silicone oils A that can be used in the present invention, it should be noted:

- volatile linear or cyclic silicone oils, in particular those having a viscosity of ≤ 8 centistokes (8 × 10 ^-6 m ² /s), and in particular containing from 2 to 7 silicon atoms, these silicones optionally include alkyl or alkoxy groups containing from 1 to 10 carbon atoms. As volatile silicone oils that can be used in the present invention, mention should be made in particular of octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane and dodecamethylpentasiloxane;

- volatile linear alkyl trisiloxane oils of the general formula

[Chem. one]

where R represents an alkyl group containing from 2 to 4 carbon atoms, one or more hydrogen atoms of which may be replaced by one or more fluorine or chlorine atoms.

[99] Among the oils of general formula (II) it should be noted:

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 represents, respectively, a butyl group, a propyl group or an ethyl group.

[100] The proportion of volatile oil(s) A relative to the total amount of oils is preferably in the range of 50% to 100% by weight.

[101] Preferably volatile oils A are selected from hydrocarbon-based oils and more preferably C8-C16 isoalkanes such as isododecane or isohexadecane, or linear C8-C16 alkanes such as undecane/tridecane mixture. Even more specifically, isododecane may be selected.

[102] The oil phase of the composition may also contain one or more fixed oils selected from hydrocarbon-based fixed oils and silicone fixed oils.

[103] Fixed hydrocarbon-based oils that can be used in the present invention can be selected from fixed hydrocarbon-based oils containing from 8 to 16 carbon atoms, such as:

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

- oils based on vegetable hydrocarbons, such as triglycerides consisting of esters of fatty acids and glycerol, fatty acids of which can be characterized by a chain length in the range from C4 to C24, while these chains are optionally linear or branched and saturated or unsaturated; in particular, these oils are triglycerides of heptanoic or octanoic acids or, alternatively, wheat germ oil, sunflower oil, coconut oil, grape seed oil, sesame seed oil, corn oil, apricot oil, castor oil, tree oil liquid shea butter, avocado oil, olive oil, soybean oil, sweet almond oil, palm oil, rapeseed oil, cottonseed oil, hazelnut oil, macadamia oil, jojoba oil, alfalfa oil, poppy seed oil, pumpkin seed oil, squash oil, blackcurrant oil, evening primrose oil, millet seed oil, barley oil, quinoa oil, rye oil, safflower oil, candle tree oil, passionflower oil and musk rose oil; solid state shea butter or other caprylic/capric acid triglycerides such as those available from Stéarinerie Dubois or available under the names Miglyol 810®, 812® and 818® from Dynamit Nobel;

- synthetic ethers containing from 10 to 40 carbon atoms;

linear or branched hydrocarbons of mineral or synthetic origin such as petrolatum, polydecenes, hydrogenated polyisobutene such as Parleam®, squalene and liquid paraffins, and mixtures thereof;

- synthetic esters, such as oils of the formula R1COOR2, where R1 is a linear or branched fatty acid residue containing from 1 to 40 carbon atoms, and R2 is, in particular, a branched hydrocarbon chain containing from 1 to 40 carbon atoms, provided that R1+R2 ≥ 10, e.g. 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-octyl dodecyl lactate; polyol esters and pentaerythritol esters;

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

[104] As examples of additional fixed silicone oils that can be used in the present invention, it should be noted:

- silicone oils, such as non-volatile polydimethylsiloxanes (PDMS); polydimethylsiloxanes, including alkyl, alkoxy - or phenyl groups, which are protruding or are at the end of the silicone chain, while these groups contain from 2 to 24 carbon atoms; phenyl trimethicones, phenyl dimethicones, phenyltrimethylsiloxydiphenylsiloxanes, diphenyldimethicones, diphenylmethyldiphenyltrisiloxanes and mixtures thereof.

[105] In accordance with a certain embodiment of the present invention, the amount of non-volatile(non-volatile) polydimethylsiloxane(polydimethylsiloxanes) is not more than 10% by weight relative to the total weight of oils.

[106] Preferably, hydrocarbon based fixed oils can be selected from hydrogenated polyisobutene based oils such as Parleam®, ethers such as PPG-14 dicaprylyl ether or butyl ether, fatty acid esters such as isopropyl palmitate, isononyl- isononanoate or C12-C15 alkyl benzoates, fatty alcohols such as octyldodecanol, and mixtures thereof.

[107] More preferably, fatty acid esters such as isopropyl myristate, isopropyl palmitate, isononyl isononanoate or C12-C15 alkyl benzoates can be selected, and even more preferably isopropyl myristate.

[108] Non-volatile hydrocarbon-based oil(s) may be present in the liquid phase of the composition in an amount ranging from 0% to 50% by weight relative to the total oil content of the composition.

cosmetic excipient

[109] Anhydrous cosmetic composition in aerosol form in accordance with the present invention contains one or more cosmetic excipients described above. In one embodiment, the composition in accordance with the present invention contains at least one antiperspirant agent, at least one deodorant and/or at least one desiccant.

Propellant

[110] Anhydrous cosmetic composition in aerosol form in accordance with the present invention contains one or more propellant gases.

[111] The propellant is selected 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 hydrofluorocarbon; notable among these are the compounds sold by DuPont de Nemours under the names Freon and Dymel, and in particular monofluorotrichloromethane, difluorodichloromethane, tetrafluorodichloroethane and 1,1-difluoroethane, sold in particular under the trade name Dymel 152 A® by DuPont.

[112] Gaseous carbon dioxide, nitric oxide, nitrogen, or compressed air can also be used as a propellant.

[113] Preferably, the anhydrous cosmetic composition in aerosol form according to the present invention contains a propellant selected from volatile hydrocarbons.

[114] More preferably, the propellant is selected from isopropane, n-butane, isobutane, pentane, and isopentane, and mixtures thereof.

[115] The weight ratio between liquid phase and propellant ranges from 5/95 to 50/50, preferably from 10/90 to 40/60, and more preferably from 15/85 to 30/70.

Suspending agents/gelling agents

[116] The anhydrous aerosol composition of the present invention may also contain one or more suspending agents and/or one or more gelling agents. Some of them can perform both functions at the same time.

[117] Among the agents that can be used as lipophilic suspending agents and/or gelling agents, it should be noted types of clay, in the form of a powder or in the form of an oil gel, while these types of clay may optionally be modified, in particular, modified types of montmorillonite clay , such as hydrophobically modified bentonites or hectorites, for example, hectorites modified with C10-C22 ammonium chloride, for example, hectorite modified with distearyldimethylammonium chloride, for example, the distearyldimonium product hectorite (CTFA name) (reaction product of hectorite and distearyldimonium chloride), sold under called Bentone 38 or Bentone Gel by Elementis Specialities. Of note is, for example, the stearalkonium product bentonite (CTFA name) (reaction product of bentonite and quaternary ammonium stearalkonium chloride), such as the commercial product sold under the name Tixogel MP 250® by Sud Chemie Rheologicals, United Catalysts Inc.

[118] It is also possible to use hydrotalcites, in particular hydrophobically modified hydrotalcites, for example the products sold under the name Gilugel by BK Giulini.

[119] Mention may also be made of colloidal silica, optionally subjected to a hydrophobic surface treatment, having a particle size of less than 1 µm. Indeed, it is possible to chemically modify the silica surface by a chemical reaction resulting in a reduced number of silanol groups present on the silica surface. In particular, the silanol groups can be replaced by hydrophobic groups: in this way hydrophobic silica is obtained. The hydrophobic groups may be trimethylsiloxyl groups, which are obtained in particular by treating colloidal silica in the presence of hexamethyldisilazane. Forms of silicon dioxide treated in this manner are known as "silicon silylate" according to CTFA (8th edition, 2000). They are available, for example, under the names Aerosil R812 from Degussa, Cab-O-Sil TS-530 from Cabot, dimethylsilyloxy or polydimethylsiloxane groups which are obtained in particular by treating colloidal silica in the presence of polydimethylsiloxane or dimethyldichlorosilane. Forms of silicon dioxin thus treated are known as "silicon dimethylsilylate" according to CTFA (8th edition, 2000). They are available, for example, under the names Aerosil R972 and Aerosil R974 from Degussa, and Cab-O-Sil TS-610 and Cab-O-Sil TS-720 from Cabot.

[120] Hydrophobic colloidal silica, in particular, is characterized by a particle size that can be nanometric or micrometric, for example, be in the range from about 5 to 200 nm.

[121] According to a certain embodiment of the present invention, suspending agents or gelling agents can be activated with oils such as propylene carbonate or triethyl citrate.

[122] The content of these various constituents that may be present in the composition of the present invention is that which is commonly used in cosmetic compositions, in particular in cosmetic compositions for the treatment of perspiration.

Specific Compositions

[123] In one embodiment, the composition in accordance with the present invention contains:

- an oil phase containing one or more volatile oils A selected from hydrocarbon-based volatile oils, preferably C8-C16 isoalkanes and more preferably isododecane;

- one or more fixed oils based on hydrocarbons, preferably selected from fatty acid esters and in particular isopropyl myristate;

- one or more antiperspirants, deodorants and/or odor absorbers;

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

- one or more propellant gases.

cosmetic treatment method

[124] It is also an object of the present invention to provide a method for the non-therapeutic cosmetic treatment of keratin-containing materials, comprising applying a previously defined composition to keratin-containing materials. The treatment method, in particular, is a method of caring for or applying make-up to keratin-containing materials. In accordance with one embodiment, the present invention relates to a cosmetic method for the treatment of perspiration in a human and optionally body odor associated with perspiration in a human, which comprises applying to the skin surface an effective amount of a cosmetic composition as described above. According to a specific embodiment, said cosmetic composition comprises, in a physiologically acceptable medium, the dispersion described above and optionally at least one cosmetic excipient selected from antiperspirant actives, deodorant actives, desiccants, lipophilic suspending agents or gelling agents, emollients, antioxidants, opacifiers. , stabilizers, humectants, vitamins, free radical scavengers, polymers, fragrances, preservatives, fillers, colorants and ceramides. The duration of application of the cosmetic composition to the skin surface may then be in the range of 0.5 to 10 seconds, and preferably 1 to 5 seconds.

[125] The cosmetic composition according to the present invention can be applied several times to the surface of the skin.

[126] In one embodiment, the method of cosmetic treatment in accordance with the present invention is to apply to the surface of the armpits an effective amount of the cosmetic composition described above.

[127] In accordance with one embodiment, the present invention also relates to the use of the above-described composition for the cosmetic treatment of perspiration in a human.

Aerosol application device

[128] Another object of the present invention is an aerosol application device comprising a container containing an aerosol composition as defined above and means for dispensing said composition.

[129] The dosing means, which is an integral part of the aerosol applicator, typically includes a spray valve controlled by a dosing head, which in turn contains a nozzle through which the aerosol composition is sprayed. The container containing the pressurized composition may be opaque or transparent. It can be made of glass, polymer or metal, optionally covered with a protective layer of varnish.

Evaluation of the transfer properties of aerosol compositions

[130] Measurement of transfer to clothing was performed according to the protocol described below.

The composition to be studied is applied to an artificial leather product available under the name Supplale® from Idemitsu Technofine, which is attached to a rigid substrate. Application is carried out by spraying an aerosol for 2 seconds at a distance of 15 cm from the substrate.

After 24 hours, a black cotton cloth, dry or sprayed with artificial sweat*, is placed on the artificial leather item. A pressure of 1 Newton is applied with a rotational movement of 1 revolution at a speed of 3.14 cm/s.

The fabric is scanned using a scanner available under the name Epson V500 Scanner (16-bit settings, grayscale, 300 dpi resolution).

Then, the brightness level of the scanned images is analyzed using ImageJ software, in which the brightness level is measured from 0 to 255. The higher the brightness level value, the stronger the traces. The lower the brightness level values, the less transfer from the test composition.

[131] Evaluation of the transfer was also carried out by monitoring the residual deposition on the plate of synthetic leather.

[132] The stability capability is considered very high if the deposit remains unchanged after the tissue passes through. It is considered appropriate if the deposit is visible after the tissue passes through. It is considered low if the deposit is no longer (or only slightly) visible after tissue passes through.

[133] Composition of artificial sweat

[134] [Table 1]

Ingredients % by weight NaCl 0.5% (85.6 mM) Lactic acid 0.1% (11.1 mM) Urea 0.1% (14.7 mM) Albumen 0.10% NH4OH Ven. quantity up to pH 6.5

Method for assessing washability with a shower gel

[135] Test compositions (in aerosol form) are sprayed from a distance of 15 cm onto a PMMA strip. Allow deposits to dry within 3 hours and 30 minutes at 35°C. Deposits are subjected to two types of tests.

- Test 1: cleaning cycle using shower gel containing 10.5% sodium laureth sulfate (as active substance): the deposit is pre-moistened with water and 0.10 g of shower gel is evenly applied with massaging movements for 20 seconds. Ensure the effect of the product within 20 seconds. The deposit is rinsed with water with light massaging movements. Allows the plate to dry naturally.

- Test 2: cleaning cycle with water. Cleaning is carried out in the same way as in test 1, but without shower gel, but only in the presence of water.

[136] The present invention is illustrated in more detail in the following examples.

[137] All values of the percentage of reagents described in the examples are percent by weight. Thus, the amounts of ingredients are expressed as percentages by weight relative to the total weight of the composition.

Examples

Example 1

[138] Synthesis of the polymer dispersion according to the present invention in isododecane

[139] In the first stage, 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 the reactor. The weight ratio of isobornyl acrylate/methyl acrylate is 91/9. The mixture was heated at 90°C in an argon atmosphere with stirring.

[140] After 2 hours of reaction, 540 g of isododecane and 360 g of ethyl acetate were added to the feedstock in the reactor, and the mixture was heated to 90°C.

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

[142] After the reaction, 3 liters of a mixture of isododecane/ethyl acetate (60/40 w/w) was added, and then all of the ethyl acetate, as well as part of the isododecane, was evaporated to provide a solids content of 45.3% by weight.

[143] A dispersion in isododecane of particles of an ethyl acrylate/acrylic acid copolymer (74.5/25.5) stabilized with an isobornyl acrylate/ethyl acrylate (91/9) random copolymer stabilizer was obtained.

[144] The oil dispersion contains a total of (stabilizer+particles) 20% acrylic acid, 60% ethyl acrylate, and 20% isobornyl acrylate.

Example 2

[145] Tests of aerosol formulations containing the dispersion of example 1

[146] the Formulations are tested in aerosol form, and they contain a base made in accordance with the method described below, and containing the ingredients mentioned in the following table.

[147] [Table 2]

Phase Ingredients Base A
(according to the present invention) Base B
(outside the scope of the present invention) A Isopropyl myristate ⁽¹⁾ 2.4 2.4 Isododecane ⁽²⁾ Ven. quantity up to 100 Ven. quantity up to 100 Isopropanol ⁽³⁾ 2.9 2.9 Perfume 5.9 5.9 Copolymer (acrylic acid, isobutyl acrylate and isobornyl acrylate) 0 14.1 Copolymer of ethyl acrylate, acrylic acid and isobornyl acrylate (60/20/20) according to example 1 15.35 0 B Distearyldimonium hectorite ⁽⁴⁾ 3 3 C Propylene carbonate ⁽⁵⁾ 1.1 1.1 D Aluminum hydrochloride ⁽⁶⁾ 41.1 41.1

[148] (1) available under the tradename Isopropyl myristate from BASF

(2) available under the trade name Isododecane from Ineos

(3) available under the trade name Isopropyl alcohol premium grade from Ineos

(4) available under the tradename Bentone 38VCG from Elementis

(5) available under the tradename Jeffsol propylene carbonate from Huntsman

(6) available under the brand name Reach 103 from Summit-Reheis

[149] The copolymer (acrylic acid, isobutyl acrylate and isobornyl acrylate) used as a reference was prepared as follows according to a two-stage method in the same reactor:

a medium containing isododecane and a radical polymerization initiator of the Trigonox T21S type is poured into the reactor and heated to a reaction temperature of 60 to 120°C;

pour the first addition for 1 hour, mainly containing isobornyl acrylate in isododecane in the presence of a radical polymerization initiator type Trigonox T21S at 90°C. The reaction mixture is kept for 2 hours at 90°C;

after 2 hours, a second block is obtained, formed by isobutyl acrylate and acrylic acid. These monomers are loaded into a reactor containing mainly isobornyl acrylate homopolymer. The monomers are added in the presence of isododecane and a free radical initiator such as Trigonox T21S. The addition usually lasts 2 hours and is carried out in the reaction medium at 90°C.

At the end, purification is carried out to remove residual monomers. The polymer has a solids content of approximately 50% in isododecane.

[150] For the preparation of formulations, phase A was mixed with stirring. Phase (B) was slowly introduced into phase (A) and the mixture was allowed to swell for five minutes. Phase (C) was introduced into the resulting mixture. The mixture was vigorously stirred until proper homogenization was obtained. Then aluminum hydrochloride was added in portions (phase D). Stirring was continued to obtain proper homogenization.

[151] The bases thus formed were placed in jars, and propellant was added to the preparations described above in accordance with the following schemes.

[152] [Table 3]

Aerosol composition Composition A
(according to the present invention) Composition B
(outside the scope of the present invention) Base A 17 - Base B - 17 Isobutane 83 83

[153] Results regarding the effectiveness of transfer resistance

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

[155] [Table 4]

Spray can Composition A
(according to the present invention) Composition B
(outside the scope of the present invention) Dry brightness level 66.1 ± 1.8 53.2 ± 1.6 Brightness level after applying artificial sweat 49.2 ± 1.2 50.8±2.0

[156] Compositions A and B exhibit adequate transfer resistance.

[157] Shower Gel Washability Results

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

[159] [Table 5]

Spray can Composition A
(according to the present invention) Composition B
(outside the scope of the present invention) Washable with shower gel proper Low Washability with water Low Low

[160] It was found that in the case of composition A in accordance with the present invention, the deposit was washed off by the shower gel, while the deposit of composition B (outside the scope of the present invention) was not washed off by the shower gel. In both cases, deposits are not washed off with water.

Example 3

[161] Aerosol Deodorant Composition Test

[162] The test composition in aerosol form contains a base made in accordance with the method described below, and containing the ingredients mentioned in the following table.

[163] [Table 6]

Phase Ingredients Base C
(according to the present invention) A Isopropyl myristate(1) 2.4 Isododecane(2) Ven. quantity up to 100 Isopropanol(3) 2.9 Perfume 5.9 Copolymer of ethyl acrylate, acrylic acid and isobornyl acrylate (60/20/20) according to example 1 15.35 B Distearyldimonium hectorite(4) 3 C Propylene carbonate(5) 1.1 D Zinc PCA(6) 5.88 D Talc(7) 25

[164] (1) available under the trade name Isopropyl myristate from BASF

(2) available under the trade name Isododecane from Ineos

(3) available under the trade name Isopropyl alcohol premium grade from Ineos

(4) available under the tradename Bentone 38VCG from Elementis

(5) available under the tradename Jeffsol propylene carbonate from Huntsman

(6) available under the tradename Micronized Zincidone from Solabia

(7) available under the tradename Mistrobond R10C from Imerys Talc

[165] Phase A was mixed with stirring. Phase (B) was slowly introduced into phase (A) and the mixture was allowed to swell for five minutes. Phase (C) was introduced into the resulting mixture. The mixture was vigorously stirred until proper homogenization was obtained. Zinc PCA and talc were then added in portions (phase D). Stirring was continued to obtain proper homogenization.

[166] [Table 7]

Aerosol composition Composition C
(according to the present invention) Base C 17 Isobutane 83

[167] Results regarding the effectiveness of transfer resistance

[168] Aerosol composition C was sprayed under the conditions described above, and the results are described in the table below.

[169] [Table 8]

Spray can Composition C
(according to the present invention) Dry brightness level 72.7 ± 3.7 Brightness level after applying artificial sweat 66.6 ± 1.6

[170] Composition C was found to exhibit high transfer resistance.

[171] Shower Gel Washability Results

[172] Aerosol composition C was sprayed under the conditions described above, and the results obtained are described in the table below.

[173] [Table 9]

Spray can Composition C
(according to the present invention) Washable with shower gel proper Washability with water Low

[0174] In the case of composition C, the deposit was found to be washed off with shower gel, but not washed off with water.

Claims (28)

1. A dispersion of particles of at least one polymer for use in cosmetic compositions, where the polymer is a surface-stabilized stabilizer, in a non-aqueous medium containing at least one non-polar hydrocarbon-based oil, while the polymer in the particles is an ethyl (meth) copolymer acrylate and (meth)acrylic acid; wherein the stabilizer is a polymer of isobornyl (meth) acrylate selected from a homopolymer of isobornyl (meth) acrylate and random copolymers of isobornyl (meth) acrylate and ethyl (meth) acrylate present at a weight ratio of isobornyl (meth) acrylate / ethyl (meth) acrylate , which is greater than 4, where the polymer in particles contains 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, and where the stabilizer+particulate polymer combination present in the dispersion contains 15 to 25 wt% polymerized isobornyl (meth)acrylate, 50 to 70 wt% polymerized ethyl (meth)acrylate and 15 to 25 wt% polymerized ( meth)acrylic acid relative to the total weight of the stabilizer+polymer combination in the particles. 2. A dispersion according to the preceding claim, characterized in that the polymer in the particles is selected from copolymers of ethyl acrylate and acrylic acid. 3. A dispersion according to any one of the preceding claims, characterized in that the polymer in the particles is present in an amount ranging from 5 to 70% by weight and preferably from 30 to 60% by weight relative to the total weight of the dispersion. 4. A dispersion according to any one of the preceding claims, characterized in that the polymer particles have an average particle size in the range of 50 to 500 nm, in particular in the range of 75 to 400 nm, and even better in the range of 100 to 250 nm. 5. Dispersion according to any one of the preceding claims, characterized in that the stabilizer is a random copolymer of isobornyl (meth) acrylate and ethyl (meth) acrylate, present at a weight ratio of isobornyl (meth) acrylate / ethyl (meth) acrylate, which is greater than 5. 6. Dispersion according to any of the previous paragraphs, characterized in that the stabilizer is selected from: isobornyl acrylate homopolymers, random copolymers of isobornyl acrylate and ethyl acrylate, random copolymers of isobornyl methacrylate and ethyl acrylate. 7. A dispersion according to any one of the preceding claims, characterized in that the hydrocarbon-based oil is selected from non-polar oils based on hydrocarbons containing from 8 to 14 carbon atoms, preferably isododecane. 8. A body cosmetic composition comprising a dispersion according to any one of the preceding claims in a physiologically acceptable medium. 9. The composition according to the preceding claim, characterized in that it contains at least one cosmetic excipient selected from antiperspirant actives, deodorant actives, desiccants, lipophilic suspending agents or gelling agents, emollients, antioxidants, opacifiers, stabilizers, humectants, vitamins , free radical scavengers, polymers, fragrances, preservatives, fillers, colorants, UV protectants and ceramides. 10. The composition according to any one of paragraphs. 8 or 9, containing, in particular, in a physiologically acceptable medium: a) an oil phase containing at least one volatile oil A; b) at least one cosmetic active agent, in particular an antiperspirant agent, a deodorant agent and/or a desiccant; and c) at least one polymer dispersion according to any one of claims 1 to 7; and d) at least one propellant; wherein said composition is anhydrous and presented in the form of an aerosol. 11. Composition according to any one of paragraphs. 9 or 10, characterized in that the antiperspirant active is selected from salts or complexes of aluminum and/or zirconium, and preferably from aluminum hydrochloride and/or aluminum sesquichloride. 12. The composition according to any one of paragraphs. 10 or 11, characterized in that the propellant is selected 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 hydrofluorocarbon . 13. Cosmetic method of treating the body to eliminate perspiration in humans, which consists in applying to the surface of the skin an effective amount of the composition according to any one of paragraphs. 8-12. 14. Cosmetic treatment according to claim 13, to eliminate body odor associated with perspiration in humans. 15. A method for non-therapeutic cosmetic treatment of keratin-containing materials, which involves applying to keratin-containing materials a composition containing a dispersion according to any one of paragraphs in a physiologically acceptable medium. 1-7. 16. The method of claim 15, wherein the composition further comprises at least one cosmetic excipient selected from antiperspirant actives, deodorant actives, desiccants, lipophilic suspending agents or gelling agents, emollients, antioxidants, opacifiers, stabilizers, humectants, vitamins, free radical scavengers, polymers, fragrances, preservatives, fillers, colorants and ceramides. 17. The method according to claim 15 for caring for or applying make-up to keratin-containing materials. 18. A device for applying an aerosol containing a container containing an aerosol composition according to any one of paragraphs. 8-12 and means for dosing said aerosol composition.