The present invention relates to compositions having an anti-deposition effect against fine particles or dusts.

The human skin and scalp is the first barrier protecting the body from the environment. Every day it undergoes external aggressions, which result in many skin problems, such as accelerated aging, skin disorder, discomfort, or skin greasiness. The external aggressions are caused for example, by UV radiation or atmospheric pollution.

In particular, atmospheric pollution, namely the pollutants in the air, has raised increasing concerns of the consumers, due to its adverse impact to the skin. Among different types of pollutants existing in the air, dust or fine particles such as PM 2.5, carbon powders or gases such as CO, S0 ₂ , NO _x , have been raising attentions of the consumers, in particular since recent years.

Fine particles existing in the air tend to be adherent to the skin. They will deposit on the skin even after cleansing. This deposition is not desired by the consumers, as it is believed that the pores on the skin will be clogged and therefore causing skin problems.

However, the conventional arts did not disclose or provide a solution for preventing or reducing the deposition of fine particles on the skin and scalp.

There thus exists a need for formulating a composition which has an anti-deposition effect against fine particles. More particularly, there exists a need for formulating a composition which prevents or reduces dusts or fine particles from depositing on keratin materials, in particular the skin and scalp.

The Applicant has now discovered that it is possible to formulate cosmetic compositions having the desired properties as described above. Specifically, the Applicant has discovered that it is possible to formulate skin care compositions, which are efficient for preventing or reducing dusts or fine particles from depositing on skin or scalp, which are non-sticky and non-greasy, and which confer a fresh feeling after application.

Thus, the present invention provides compositions having improved anti-deposition effect against fine particles. By "anti-deposition effect", it is meant that the compositions reduce or prevent dust or fine particles on the keratin materials, in particular the skin or scalp. Particularly, the invention provides skin care or make-up compositions showing an anti-deposition effect against dust or fine particles, by mimicking the surface of lotus leaf, also called "lotus effect". Said "lotus effect" refers to anti-deposition against dust or fine particles and self-cleansing properties of the surface of lotus leaf.

The present invention thus relates to a composition in the form of an oil-in-water emulsion, comprising:

a) particles having a mean particle size of less than 0.8 micrometer; and

b) at least one non-ionic surfactant of ester type, comprising a mixture of at least one monounsaturated ester and at least one polyglyceryl diester.

Such a composition confers an anti-deposition effect against fine particles. When applied on keratin materials, in particular the skin and scalp, the composition of the present invention reduces or minimizes the deposition of dust or fine particles on the keratin materials, thus ensuring protection thereof. In order to obtain this lotus effect, in particular the anti-deposition effect against fine particles or dust, the compositions according to the invention comprise a combination of particles and particular non-ionic surfactant(s) of ester type, in order to mimic the roughness of lotus leaf surface.

Specifically, without being bound by any theory, the non-ionic surfactant of ester type b) plays the role of emulsifier and film-former. When used in combination with the particles a), it forms a two-tier rough surface on skin, and mimics the surface of lotus leaf, thereby showing an improved anti-deposition effect.

Other subjects and characteristics, aspects and advantages of the invention will emerge even more clearly on reading the description and the examples that follows.

In that which follows and unless otherwise indicated, the limits of a range of values are included within this range, in particular in the expressions "of between" and "ranging from ... to

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

Throughout the instant application, the term "comprising" is to be interpreted as encompassing all specifically mentioned features as well optional, additional, unspecified ones. As used herein, the use of the term "comprising" also discloses the embodiment wherein no features other than the specifically mentioned features are present (i.e. "consisting of"). The "dust or fine particles" have to be interpreted as the atmospheric particulate matters, also known as particulate matters (PM) or particulates, referring to microscopic solid or liquid matters suspended in the Earth's atmosphere. In particular, "PM 2.5" as mentioned above refers to fine particles with diameter of 2.5 micrometers or less.

The "keratin materials" mean human keratin materials, and more specifically skin and scalp, in particular skin.

The term "mean particle size" or "particle size" in accordance to the present invention is the mean particle size measured by a Brookhaven BI-90 photon correlation spectrometer.

The effects of anti-deposition of dust or fine particles according to the present invention is represented by the percentage weight change of carbon black particles removed from bio-skin. Detailed evaluation method will be described hereafter.

According to the present invention, the composition comprises particles a) having a mean particle size of less than 0.8 micrometer.

Preferably, the particles a) have a particle size varying from 100 nm to 800 nm, preferably from 150 nm to 400 nm, and more particularly from 150 nm to 375 nm, as measured by a Brookhaven BI-90 photon correlation spectrometer.

The particles a) according to the present invention can be particles of any shape, which are insoluble and dispersed in the medium of the composition irrespective of the temperature at which the composition is manufactured.

For example the particles a) of the present invention may be in lamellar (or platelet), spherical (or globular) particles, in the form of fibers or in any other intermediate form between these defined forms.

In the present application, the term "spherical particles" is intended to mean particles in the shape or substantially in the shape of a sphere, which are insoluble in the medium of the composition according to the invention, even at the melting point of the medium (approximately 100°C).

The term "lamellar particles" is intended here to mean particles of parallelepipedal shape (rectangular or square surface), discoid shape (circular surface) or ellipsoid shape (oval surface), characterized by three dimensions: a length, a width and a height, said particles being insoluble in the medium of the composition according to the invention, even at the melting point of the medium (approximately 100°C).

According to a preferred embodiment, the particles a) according to the invention are chosen from spherical particles, optionally partially hollow. Preferably, the particles a) suitable for the present invention are hollow spherical particles.

The hollow particles according to the invention may have a particle size which ranges generally from 100 to 380 nm, preferably from 150 to 375 nm, the particle size being measured by a Brookhaven BI-90 photon correlation spectrometer.

For a given particle size, the hollow particles according to the invention, in general, possess a maximum hollow fraction. The hollow particles preferably contain a void fraction of 0.1 % to 50% and more preferably of 5% to 50%. The void fractions are determined by comparing the volume occupied by the hollow particles after having been compacted from a diluted dispersion in a centrifuge, relative to the volume of non-void particles in the same composition.

Hollow particles according to the invention may be obtained from particles comprising at least one polymer for the core and at least one polymer for the shell. The core polymer and the shell polymer may be obtained from a single polymerization step or from a sequence of polymerization steps.

The hollow particles according to the invention may be prepared by the conventional techniques of emulsion polymerization. Such processes are described especially in patents US 4,427,836, US 4,469,825, US 4,594,363, US 4,677,003, US 4,920,160, and US 4,970,241 or by the conventional techniques of polymerization that are described in the following patents and patent applications: EP267726, EP331421 , US 490,229, and US 5,157,084.

The monomers used for the shell of the hollow particles are preferably constituted of one or more unsaturated nonionic ethylenic monomers. Optionally one or more monoethylenically unsaturated monomers containing at least one carboxylic acid group may be polymerized in the shell.

The monomers constituting the shell may be selected such that they exhibit a glass transition temperature (Tg) which is sufficiently high to withstand the void of the hollow particle. Preferably the glass transition temperature is greater than 50°C, more preferably greater than 60°C, and more preferably still greater than 70°C. This temperature Tg may be determined by DSC (differential scanning calorimetry).

The monomers used in the emulsion polymerization in the core polymer of the hollow particles of the invention are preferably constituted of one or more monoethylenically unsaturated monomers containing at least one carboxylic acid group. Preferably the core comprises at least 5% by weight of monoethylenically unsaturated monomer containing at least one carboxylic acid group, relative to the total weight of the core monomers. The core polymer may for example be obtained by emulsion homopolymerization of the monoethylenically unsaturated monomer containing at least one acid group or by copolymerization of two or three monoethylenically unsaturated monomers containing at least one acid group. Preferably the monoethylenically unsaturated monomer containing at least one acid group is copolymerized with one or more ethylenically unsaturated nonionic monomers.

The core polymer or the shell polymer may contain from 0.1 % to 20% by weight, preferably from 0.1 % to 3% by weight, of polyethylenically unsaturated monomers such as ethylene glycol di(meth)acrylate, allyl (meth)acrylate, 1 ,3-butanediol di(meth)acrylate, diethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, or divinylbenzene, relative to the total weight of core monomers. Alternatively the core polymer or the shell polymer may optionally contain from 0.1 % to 60% by weight of butadiene, relative to the total weight of core monomers.

The monoethylenically unsaturated monomers containing at least one carboxylic acid group include, for example: acrylic acid, methacrylic acid, acryloyloxypropionic acid, (meth)acryloyloxypropionic acid, itaconic acid, aconitic acid, maleic acid or maleic anhydride, fumaric acid, crotonic acid, monomethyl maleate, monomethyl fumarate, and monomethyl itaconate.

Use will be made more particularly of a monomer selected from acrylic acid and methacrylic acid.

The monoethylenically unsaturated nonionic monomers include, for example: styrene, vinyltoluene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, (meth)acrylamide, Ci-C ₂₀ alkyl esters of (meth)acrylic acid, and (C ₃ -C ₂ o) alkenyl esters of (meth)acrylic acid, such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, benzyl (meth)acrylate, lauryl (meth)acrylate, oleyl (meth)acrylate, palmityl (meth)acrylate, and stearyl (meth)acrylate. According to the invention, the term (meth)acrylic will denote the general expression encompassing both methacrylic or acrylic. The term (meth)acrylate will denote the general expression encompassing both methacrylate or acrylate.

The void part of the core of the hollow particles is preferably produced by swelling the core with a swelling agent comprising one or more volatile compounds. The agent penetrates the shell in order to swell the core. The volatile components of the swelling agent may be subsequently removed by drying the hollow particles, thus creating a void within the said particles. The swelling agent is preferably an aqueous base. Mention may be made, for example, of ammonia, ammonium hydroxide, alkali metal hydroxides such as sodium hydroxide, and volatile amines such as trimethylamine or triethylamine. The hollow particles may be introduced into the composition of the invention with the swelling agent. In such a case the volatile compounds are removed when the composition is dried. The hollow particles may also be added to the composition after the volatile compounds of the swelling agent have been removed.

The hollow particles which can be used according to the invention are those described in patent US 5,663,213 and patent application EP1092421 .

According to one particular embodiment of the invention, the hollow particles used will be those constituted of a copolymer of styrene and (meth)acrylic acid or one of its C C ₂₀ alkyl esters under the INCI name Styrene/Acrylates Copolymer, such as the product sold under the trade name Sunspheres™ Powder by the company Rohm & Haas, which contains 86% of Styrene/Acrylates Copolymer in a mixture of 1 1 % of PEG-8 Laurate, 2.5% of water, and 0.5% of Sodium Dodecylbenzenesulfonate.

Advantageously, the composition according to the present invention comprises the particles a) in an amount of from 0.1 % to 5% by weight, preferably from 0.5% to 4% by weight, relative to the total weight of the cosmetic composition.

According to the present invention, the composition comprises at least one non-ionic surfactant of ester type, which is particularly a mixture of at least an ester obtained by esterification of a solid wax with a polyol, of a fatty acid diester with a polyglycerol, of a jojoba wax (preferably a jojoba wax ester), and of a fatty alcohol. Said ester is non-ionic. Said non-ionic surfactant of ester type comprises a mixture of at least one monounsaturated ester and at least one polyglyceryl diester.

According to an embodiment, the non-ionic surfactant of ester type comprises:

i) at least one monounsaturated ester of formula (A),

R1 -C(0)-0-R2 (A)

wherein:

R1 and R2 represent, respectively, a C18 to C44 fatty chain, at least one of R1 or R2 is monounsaturated;

ii) at least one polyglyceryl diester of formula (B),

R3-C(0)-(0-CH2-CH(OH)-CH2)n-0-C(0)-R4 (B) wherein:

R3 and R4 represent, respectively, a saturated C18 to C44 fatty chain, linear or branched, and

iii) at least one C10-C30 fatty alcohol. According to an embodiment, in the formula (A), R1 and R2 represent, respectively, a C18-C40 fatty chain, more preferably a C18-C30 fatty chain. At least one of R1 or R2 is monounsaturated.

More specifically, in formula (A), the R1— C(O) group corresponds to the carbon chain of the fatty acid. This chain may be linear or monounsaturated, and comprises at least 18 carbon atoms. Mention can be made of oleic (C18:1 ), gadoleic (C20:1 ), erucic (C22:1 ) acid, up to hexaconenoic (C26:1 ) acid for unsaturated acids. The R1— C(O) group may also consist of branched and saturated acids of at least 18 carbon atoms, also called Guerbet acids. The R2— O— group may consist of monounsaturated linear fatty alcohols with at least 18 carbon atoms. Mention can therefore be made of octadecenol, eicosenol, docosenol and hexacosenol. The carbon chain of the alcohol may also be branched and saturated and comprise at least 18 carbon atoms. Such alcohols are also called Guerbet alcohols.

Preferably, the monounsaturated ester of the formula (A) is a mixture of esters comprising various lengths of fatty chains in their structures. More preferably, such a monounsaturated ester is liquid at ambient temperature.

A preferred monounsaturated ester can be mentioned is, for example, the product commonly called jojoba oil (or jojoba esters), the liquid nature being due to the presence of monounsaturated chains. This oil comprises in particular C18:1 (preferably minority), C20:1 and C22:1 (preferably majority with C20:1 >C22:1 ) unsaturated fatty acid esters, with C20:1 , C22:1 and C24:1 unsaturated fatty alcohols.

According to an embodiment, in the formula (B), the R3— C(O)— group corresponds to the carbon chain of C18 to C44 fatty acid, said acid usually being linear and saturated, preferably corresponds to a linear and saturated C20 to C34 fatty acid. This therefore includes eicosanoic (or arachidic) acid (C20), docosanoic (or behenic) acid (C22), tetracosanoic (or lignoceric) acid (C24), hexacosanoic (or cerotic) acid (C26). The R4 group corresponds to the hydrocarbon chain of the alcohol, said alcohol usually being saturated linear and having a C18 to C44 chain, preferably C20 to C34 chain, n is an integer between 2 to 6.

According to the present invention, the polyglyceryl diester is obtained by esterification of a solid wax in the presence of at least one polyol.

The wax under consideration in the context of the present invention is generally a lipophilic compound that is solid at room temperature (25°C), with a solid/liquid reversible change of state, having a melting point of greater than or equal to 30°C, preferably greater than or equal to 40 ⁵ C, which may be up to 200°C and in particular up to 120°C. Depending on the source of the wax, the mixture of monoesters may also contain a certain proportion of hydroxyacid esters such as hydroxypalmitic or hydroxystearic acid. This is the case for example of beeswax. Preferably said alcohol is eicosanol, docosanol or tetracosanol. Beeswax, carnauba wax, candelilla wax, rice bran wax, sunflower wax, ouricury wax, Shellac wax and sugarcane wax are examples of natural solid waxes. Preferably, the solid wax is beeswax.

Solid waxes suitable for obtaining the polyglyceryl diester have a melting point between 50 and 90°C. They correspond to mixtures essentially comprising monoesters having the formula R ¹ — C(O)— O— R ² , where the R ¹ — C(O)— group corresponds to the carbon chain of the fatty acid, said acid usually being linear and saturated and having a number of carbon atoms of at least 18, and in particular 20, and preferably up to 44 and preferably 34. This therefore includes eicosanoic (or arachidic) acid (C20), docosanoic (or behenic) acid (C22), tetracosanoic (or lignoceric) acid (C24), hexacosanoic (or cerotic) acid (C26). Depending on the source of the wax, the mixture of monoesters may also contain a certain proportion of hydroxyacid esters such as hydroxypalmitic or hydroxystearic acid. This is the case for example of beeswax. The R ² group corresponds to the hydrocarbon chain of the alcohol, said alcohol usually being saturated linear and having a number of carbon atoms of at least 18, and in particular 20, and preferably up to 44 and preferably 34. Preferably said alcohol is eicosanol, docosanol or tetracosanol. Beeswax, carnauba wax, candelilla wax, rice bran wax, sunflower wax, ouricury wax, Shellac wax and sugarcane wax are examples of natural solid waxes.

Preferably, the solid wax suitable for the esterification reaction is beeswax.

Preferably, the polyol used for esterification is selected from the group comprising ethylene glycol, diethylene glycol, triethylene glycol, 2-methyl propanediol, propylene glycol, butylene glycol, neopentyl glycol, hexylene glycol, octylene glycol, polyethylene glycol, polypropylene glycol, trimethylol propane, sorbitol, erythritol, pentaerythritol, dipentaerythritol, glycerol, diglycerol and polyglycerol (i.e. a polymer of glycerol units). More preferably, the polyol is a polyglycerol, having an average degree of polymerization between 2 and 6, preferably of 3. Preferably, the polyol is polyglycerol-3.

The non-ionic ester surfactant also comprises the acid part of a solid wax. Waxes have a complex composition. They have the common feature of containing a mixture of acid monoesters and very long chain fatty alcohols.

Preferably, the non-ionic ester surfactant is a wax derivative obtained by reacting together at least one solid wax and at least one monounsaturated ester of formula (A) in the presence of at least one polyol and optionally at least one catalyst. In such a case, a transesterification reaction occurs between the various chemical entities yielding the wax derivative.

The preferred catalysts are hydroxides or alkaline or alkaline earth alkoxides, calcium hydroxide, potassium or sodium carbonates or catalysts based on tin or titanium.

Preferably, the solid wax is advantageously selected from the group comprising carnauba wax, candelilla wax, rice bran wax, sunflower wax, sugarcane wax, ouricury wax, beeswax and Shellac wax.

In a preferred embodiment, the wax derivative is obtained by reacting jojoba oil (also called as jojoba wax), beeswax and a polyglycerol, such as polyglycerol-3.

In practice, the reaction is preferably conducted at a temperature of between 100°C and 220°C, advantageously between 150°C and 200°C. Preferably, the liquid wax/solid wax mass ratio varies between 5/95 and 95/5, advantageously between 30/70 and 75/25. The wax/polyol mass ratio preferably varies between 1/99 and 99/1 , advantageously between 95/5 and 50/50. Preferably, the proportion of esterified polyol represents between 0.5 and 50% by weight of the mixture, the proportion of esterified fatty acids represents between 20 and 60% by weight of the mixture and the proportion of esterified fatty alcohols between 20 and 60% by weight of the mixture.

Preferably, the non-ionic ester surfactant is further present with a diester of a Ci ₄ - C ₂₂ fatty acid with a polyglycerol.

Typically, the Ci ₄ -C ₂₂ fatty acid may be chosen from the group of myristic acid, stearic acid, isostearic acid, palmitic acid, oleic acid, behenic acid, erucic acid and arachidic acid, and mixtures thereof.

The polyglycerol may be a polymer of glycerol units, preferably a polymer having an average degree of polymerization between 4 and 8, preferably of 6.

Preferably, said diester is a diester of distearic acid with hexaglycerol. Preferably, it is polyglyceryl-6 distearate.

According to one particular mode of the invention, the non-ionic ester type surfactant according to the invention comprises at least one fatty alcohol containing from 10 to 30 carbon atoms.

As examples of fatty alcohols that may be used, mention may be made of linear or branched fatty alcohols, of synthetic origin or alternatively of natural origin, for instance alcohols originating from vegetable material (coconut, palm kernel, palm, etc.) or animal material (tallow, etc.). Use is preferably made of a fatty alcohol comprising from 20 to 26 carbon atoms, preferably from 10 to 24 carbon atoms and more preferentially from 12 to 22 carbon atoms. As particular examples of fatty alcohols that may be used in the context of the present invention, mention may in particular be made of lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, isostearyl alcohol, palmityl alcohol, oleyl alcohol, cetearyl alcohol (mixture of cetyl alcohol and stearyl alcohol), behenyl alcohol, erucyl alcohol and arachidyl alcohol, and mixtures thereof.

In addition, it is particularly advantageous, according to the present invention, to use together a mixture of polyglyceryl-6 distearate and polyglyceryl-3 beeswax, with cetyl alcohol and jojoba wax. Among the mixtures that are particularly preferred, mention may be made of the product sold by the company Gattefosse under the name Emulium ^® Mellifera, comprising jojoba wax, cetyl alcohol, polyglyceryl-6 distearate, and polyglyceryl- 3 beeswax (INCI name: Polyglyceryl-6 Distearate (and) Jojoba Esters (and) Polyglyceryl-3 Beeswax (and) Cetyl Alcohol). Said mixture comprises from 5 to 30% by weight of the total weight of the mixture of jojoba wax; from 3 to 15% by weight of cetyl alcohol; at least 50% by weight of polyglyceryl-6 distearate; and from 3 to 15% by weight of polyglyceryl-3 beeswax.

The non-ionic ester surfactant may be present in a composition of the invention in a content ranging from 0.1 % to 10% by weight, preferably from 0.5% to 5% by weight, relative to the total weight of the composition.

The composition of the invention is in the form of an oil-in-water emulsion.

Thus, it comprises a continuous aqueous phase (i). Said aqueous phase is preferably present in an amount ranging from 10% to 90% by weight, more preferably from 20% to 80% by weight of the total weight of the composition.

The continuous aqueous phase may comprise water, at least one organic solvent miscible with water or mixtures thereof.

Preferably, the continuous aqueous phase comprises at least one organic solvent miscible with water (at room temperature - 25°C) such as for example monoalcohols having from 2 to 6 carbon atoms such as ethanol, isopropanol; polyols notably having from 2 to 20 carbon atoms, preferably from 2 to 10 carbon atoms, and preferentially having from 2 to 6 carbon atoms, such as glycerol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, caprylylglycol, dipropylene glycol, diethylene glycol; glycol ethers (notably having from 3 to 16 carbon atoms) such as mono-, di- or tri- propylene glycol (CrC ₄ )alkyl ethers, mono-, di- or tri-ethylene glycol (CrC ₄ ) alkyl ethers; and mixtures thereof. The continuous aqueous phase of the composition of the invention preferably comprises water and at least a polyol, preferably glycerol or propylene glycol, and/or a monoalcohol, preferably ethanol.

Preferably, the continuous aqueous phase comprises water, a mixture of polyols, preferably glycerol and propylene glycol, and a monoalcohol, preferably ethanol.

Preferably, water is present in an amount ranging from 20% to 80% by weight, more preferably from 30% to 60% by weight of the total weight of the composition.

Preferably, the organic solvent(s) miscible with water is(are) present in an amount ranging from 5% to 80% by weight, more preferably from 7% to 20% by weight of the total weight of the composition.

The continuous aqueous phase may comprise a thickener. The thickeners may advantageously be chosen from xanthan, guar, hydroxypropyl guar, scleroglucan, methyl cellulose, ethyl cellulose (available as AQUACOTE ^® ), hydroxyethyl cellulose (NATROSOL ^® ), carboxymethyl cellulose, hydroxypropylmethyl cellulose, microcrystalline cellulose, hydroxybutylmethyl cellulose, hydroxypropyl cellulose (available as KLUCEL ^® ), hydroxyethyl ethyl cellulose, cetyl hydroxyethyl cellulose (available as NATROSOL ^® Plus 330), N-vinylpyrolidone (available as POVIDONE ^® ), Acrylates/Ceteth-20 Itaconate Copolymer (available as STRUCTURE ^® 3001 ), hydroxypropyl starch phosphate (available as STRUCTURE ^® ZEA), polyethoxylated urethanes or polycarbamyl polyglycol ester (e.g. PEG-150/Decyl/SMDI copolymer (e.g. ACULYN ^® 44), PEG-150/Stearyl/SMDI copolymer (available as ACULYN ^® 46), trihydroxystearin (available as THIXCIN ^® ), acrylates copolymer (e.g. available as ACULYN ^® 33) or hydrophobically modified acrylate copolymers (e.g. acrylates/steareth-20 methacrylate copolymer (available as ACULYN ^® 22), acrylates/steareth-20 methacrylate crosspolymer (available as ACULYN ^® 88), acrylates/vinyl neodecanoate crosspolymer (available as ACULYN ^® 38), acrylates/beheneth-25 methacrylate copolymer (available as ACULYN ^® 28), Acrylates/C 10-30 Alkyl Acrylate Crosspolymer (Pemulen™ TR1 and TR2); Carbomers (Aqua SF-1 ); hydrophobically modified sulfonic acid copolymers such as Ammonium Acryloyldimethyltaurate/VP Copolymer (Aristoflex AVC from Clariant), Ammonium Acryloyldimethyltaurate/Beheneth-25 Methacrylate Crosspolymer (Aristoflex ^® HMB from Clariant), Ammonium Acryloyldimethyltaurate/Steareth-25 Methacrylate Crosspolymer (Aristoflex ^® HMS); and Polyacrylamides such as Sepigel™ 305 from SEPPIC.

Preferably, the thickener is present in an amount ranging from 0.1 % to 10% by weight, more preferably from 0.5% to 5% by weight of the total weight of the composition. The composition of the invention further comprises a dispersed fatty phase.

The fatty phase may comprise at least one oil.

For the purposes of the invention, the oil means a fatty substance which is liquid at room temperature (25°C) and atmospheric pressure (760 mmHg, i.e. 101 kPa). The oil means a non-aqueous liquid medium which is immiscible in all proportions with water, for example, a hydrocarbon-based compound comprising one or more carbon chains each containing at least 5 carbon atoms and possibly comprising at least one polar group chosen from carboxylic acid, hydroxyl, polyol, amine, amide, phosphoric acid, phosphate, ester, ether, urea, carbamate, thiol, thioether and thioester, a silicone compound optionally comprising carbon chains at the end or pendant, these chains optionally being substituted with a group chosen from fluoro, perfluoro, (poly)amino acid, ether, hydroxyl, amine, acid and ester groups; or a fluoro or perfluoro compound such as fluorohydrocarbons or perfluorohydrocarbons containing at least 5 carbon atoms, possibly comprising a hetero atom chosen from N, O, S and P and optionally at least one function chosen from ether, ester, amine, acid, carbamate, urea, thiol and hydroxyl groups.

The oil may be volatile or non-volatile. The expression "volatile oil" means any non-aqueous medium capable of evaporating on contact with the skin or the lips in less than one hour at room temperature and atmospheric pressure. The volatile oil is liquid at room temperature and has a non-zero vapor pressure, at room temperature and atmospheric pressure, ranging in particular from 10 ^~2 to 300 mmHg (1 .33 to 40 000 Pa) and, for example, greater than 0.03 mmHg (4 Pa) and further example greater than 0.3 mmHg (40 Pa). The expression "non-volatile oil" means an oil which remains on the skin or the lips at room temperature and atmospheric pressure for at least several hours, such as those having a vapor pressure of less than 10 ^~2 mmHg (1 .33 Pa).

The oil may be chosen from polar oils and apolar oils including hydrocarbon- based liquid oils and oily liquids at room temperature. The oil can be, for example, present in an amount ranging from 1 % to 60% by weight relative to the total weight of the composition, preferably from 5% to 50%.

For example, the polar oil useful in the invention may be chosen from the group of:

- hydrocarbon-based plant oils with a high content of triglycerides comprising fatty acid esters of glycerol in which the fatty acids may have varied chain lengths from C ₄ to C ₂ 4, these chains possibly being chosen from linear and branched, and saturated and unsaturated chains; these oils can be chosen from, for example, wheat germ oil, corn oil, sunflower oil, the liquid fraction of shea butter (such as the one sold by Aarhuskarlshamn under the name Lipex 202), karite butter, castor oil, sweet almond oil, macadamia oil, apricot oil, soybean oil, cotton oil, alfalfa oil, poppy oil, pumpkin oil, sesame oil, marrow oil, rapeseed oil, avocado oil, hazelnut oil, grape seed oil, blackcurrant seed oil, evening primrose oil, millet oil, barley oil, quinoa oil, olive oil, rye oil, safflower oil, candlenut oil, passion flower oil and musk rose oil; or alternatively caprylic/capric acid triglycerides such as those sold by Stearineries Dubois or those sold under the names Miglyol 810, 812 and 818 by Dynamit Nobel;

- synthetic oils or esters of formula R ₅ COOR ₆ in which R ₅ is chosen from linear and branched fatty acid residues containing from 1 to 40 carbon atoms and R ₆ is chosen from, for example, a hydrocarbon-based chain containing from 1 to 40 carbon atoms, on condition that R ₅ + R ₆ > 10, such as, for example, purcellin oil (cetostearyl octanoate), isononyl isononanoate, C ₁₂ -C ₁₅ alkyl benzoates, isopropyl myristate, myristyl myristate, 2- ethylhexyl palmitate, isostearyl isostearate and alkyl or polyalkyl octanoates, decanoates or ricinoleates; hydroxylated esters such as isostearyl lactate and diisostearyl malate; and pentaerythritol esters;

- synthetic ethers containing from 10 to 40 carbon atoms;

- C ₈ to C ₂₆ fatty alcohols such as cetyl alcohol, behenyl alcohol or oleyl alcohol; and

- C ₈ to C ₂₆ fatty acids such as oleic acid, linolenic acid or linoleic acid.

The apolar oil according to the invention is chosen from the group of, for example, silicone oils chosen from volatile and non-volatile, linear and cyclic polydimethylsiloxanes (PDMSs) that are liquid at room temperature; polydimethylsiloxanes comprising alkyl or alkoxy groups which are pendant and/or at the end of the silicone chain, the groups each containing from 2 to 24 carbon atoms; phenylsilicones such as phenyl trimethicones, phenyl dimethicones, phenyl trimethylsiloxy diphenylsiloxanes, diphenyl dimethicones, diphenyl methyldiphenyl trisiloxanes and 2- phenylethyl trimethylsiloxysilicates; hydrocarbons chosen from linear and branched, volatile and non-volatile hydrocarbons of synthetic and mineral origin, such as volatile liquid paraffins (such as isoparaffins and isododecane) or non-volatile liquid paraffins and derivatives thereof, liquid petrolatum, liquid lanolin, polydecenes, hydrogenated polyisobutene such as Parleam ^® , and squalane; and mixtures thereof.

Preferably, the dispersed fatty phase comprises at least one oil chosen from the group of volatile and non-volatile silicone oils.

The dispersed fatty phase may also include an emulsifying crosslinked siloxane elastomer, preferably at a concentration, by weight, of about 0.1 % to about 20%, preferably about 0.3% to about 10%, preferably about 0.5% to about 7% by weight relative to the total weight of the composition. Examples of suitable emulsifying crosslinked siloxane elastomers, include, but are not limited to, substituted or unsubstituted dimethicone/copolyol crosspolymer, dimethicone and dimethicone/PEG-10/15 crosspolymers, substituted or unsubstituted dimethicone/polyglyceryl crosspolymer, dimethicone and dimethicone/polyglycerin-3 crosspolymer. Such suitable emulsifying crosslinked siloxane elastomers are sold or made, for example, under the names of "KSG- 210", i.e. a polyether-modified cross polymer with an INCI name of dimethicone (and) dimethicone/PEG-10/15 crosspolymer, and "KSG-710", i.e. a polyglycerin-modified crosspolymer with an INCI name of dimethicone (and) dimethicone/polyglycerin-3 crosspolymer, both available from Shin-Etsu Silicones of America, Inc. (Akron, Ohio).

The composition of the invention may comprise other ingredients, such as anionic, amphoteric or zwitterionic surfactants. These surfactant(s) can be, for example, present in an amount ranging from 0.1 % to 5% by weight relative to the total weight of the composition, preferably from 0.2% to 1 %.

These surfactants can be chosen in particular from anionic derivatives of proteins of vegetable origin, amino acids and amino acid derivatives, alkyi sulphates, alkyi ether sulphates, sulphonates, isethionates, taurates, sulphosuccinates, alkyi sulphoacetates, phosphates and alkyi phosphates, polypeptides, anionic derivatives of alkyi polyglucoside, soaps (salts of fatty acids), soybean oil derivatives, acylamino acids, amino acid derivatives, their salts and their mixtures.

Mention may be made, as acylamino acids, of sodium cocoyi glycinate, sold by Ajinomoto under the name Amilite GCS-12, alaninates and their derivatives, such as that sold under the name Amilite ACS-12 by Amilon, sodium cocoyi glycinate, sold by Ajinomoto under the name Amilite GCK-12, disodium cocoyi glutamate, sold by Ajinomoto under the name Amisoft ECS-22SB, sodium lauroyl glutamate, sold by Ajinomoto under the name Amisoft LS1 1 , sodium lauroyl sarcosinate, sold by Seppic under the name Oramix L 30, disodium and sodium stearoyl glutamate, sold by Ajinomoto under the names Amisoft HS21 P and HS1 1 P, and sodium cocoyi sarcosinate, sold by Zschimmer & Schwarz under the name Protelan LS 901 1/C. Mention may also be made of the sodium salt of lauroyl oat amino acids, such as Proteol Oat sold by Seppic, or the compound carrying the INCI name sodium cocoylamino acids, such as Proteol SAV 50S from Seppic.

The amino acid derivatives can be chosen, for example, from sarcosinates and in particular acylsarcosinates, such as sodium lauroylsarcosinate, sold under the name Sarkosyl NL 97 ^® by Ciba or sold under the name Oramix L 30® by Seppic, sodium myristoyl sarcosinate, sold under the name Nikkol Sarcosinate MN® by Nikkol, or sodium palmitoyl sarcosinate, sold under the name Nikkol Sarcosinate PN® by Nikkol; alaninates, such as sodium N-lauroyl-N-methylamidopropionate, sold under the name Sodium Nikkol Alaninate LN 30® by Nikkol or sold under the name Alanone Ale®, by Kawaken, and triethanolamine N-lauroyl-N-methylalanine, sold under the name Alanone Alta® by Kawaken; aspartates, such as the mixture of triethanolamine N-lauroyl aspartate and triethanolamine N-myristoyl aspartate, sold under the name Asparack® by Mitsubishi; or citrates.

The composition of the invention may also further comprise at least one additive. A person skilled in the art can adjust the type and amount of additives present in the compositions according to the invention by means of routine operations, so that the desired cosmetic properties and stability properties for these compositions are not affected by the additives.

The present invention also relates to a method for reducing deposition of fine particles on keratin materials, in particular the skin and scalp, comprising the application to the keratin materials of the composition of the invention.

Finally, the present invention also relates to the use of the composition of the invention for reducing deposition of fine particles and/or water on keratin materials, in particular the skin and scalp.

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

EXAMPLES

Example 1 : Preparation of a composition according to the present invention

A composition according to the invention was prepared according to the amounts in the table below. The amounts are given in % by weight of the total composition.

Phase INCI Name Invention Comparative Comparative formula formula B formula C

A Amount Amount (%

Amount (% w/w) w/w)

(% w/w)

Comparative formula B does not contain particles a) as described in the present invention; Comparative formula C contains silica particles, which have a mean particle size of 5.1 μηι, which is not in the scope of the particles a) as described. The formulas were prepared according to the following steps:

Phase A1 was heated to 80°C until totally melted before phase A2 was introduced.

Phase B1 was homogenized at 60°C before temperature was raised up to 80°C, andphase B2 was added. When the mixture was homogenized, phase B3 was then added.

The mixture of A1 and A2 was added into the mixture of phases B1 , B2 and B3, homogenized for 10-15 min at 80°C. The heating was then stopped and while cooling down to room temperature phases C, D, E were added in sequence. Phases F,G were added to the obtained mixture at room temperature.

Example 2: Evaluation of the properties of the invention and comparative formulas

The anti-deposition effects against fine particles on the skin have been tested according to the tests described below.

Sample preparation:

On the 5X5 cm square of Bioskin (Beaulax Co., Ltd.,) already washed out (weight of bioskin = W1 ), 2 mg/cm ² (50mg if the square of Bioskin is 25cm ² ) of the formula to be tested is spread with a finger coat, then is dried on heating plate (T=32°C) for 25min (W2). Carbon black (CB) is used as model of pollutant's particles (Sigma Aldrich Product Number 242276), this dry powder grade got a distribution size close to 34 μηι. The dry particles are dropped on a 160μηι sieve and passed through the sieve using a saturated brush until there is not any trace of CB on sieve (W3). The contaminated bioskin was left dry on heating plate (T=32°C) for 10min (W4).

The CB at the surface of formula was removed with a low-angled air (W5). This is achieved by an airbrush with IWATA compressor with a flow pressure at 0.6 bars. The distance between airbrush and Bioskin plate is 10 cm. The inventors applied a rotation movement for 30 seconds (7 seconds for each quarter circle), and just put the airbrush at the edge of the circle in order to make an angle of 0° with the Bioskin.

The CB removal efficacy is calculated as follows:

removed CB W4 - WB

CB romoval efficacy

spread. CB W - V/2

The higher CB removal is, the better is the anti-deposition performance of the formula tested. The results are as follows:

Formula CB removal efficacy

Invention formula A 82.62%

Comparative formula B 66.83%

Comparative formula C 63.38%

It is shown in the results listed above, that the invention formula A has better anti- deposition performance compared to the comparative formula B and comparative formula C, an increase of 15% and 20% of the anti-deposition of fine particles are observed, respectively.