Anhydrous composition comprising a solid lipophilic organic UV-screening agent, a semicrystalline homopolymer and a mixture of silicas

Abstract

Anhydrous composition comprising a solid lipophilic organic UV-screening agent, a semicrystalline homopolymer and a mixture of silicas The present invention relates to an anhydrous cosmetic or dermatological composition comprising a solid lipophilic organic UV-screening agent; at least 5% by weight of hydrophobic silica aerogel particles, relative to the total weight of the composition; an amorphous spherical silica; an ester oil; and a semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain.

Description

[0001] Description

[0002] Title: Anhydrous composition comprising a solid lipophilic organic UV-screening agent, a semicrystalline homopolymer and a mixture of silicas

[0003] Technical field

[0004] The present invention relates to compositions, notably cosmetic or dermatological compositions, in particular for caring for keratin materials, notably for caring for the skin, comprising a solid lipophilic organic UV-screening agent, a semicrystalline homopolymer and a mixture of silicas.

[0005] Prior art

[0006] It is known that radiation with a wavelength of between 280 nm and 400 nm enables tanning of the human epidermis and that radiation with a wavelength of between 280 and 320 nm, known under the name UVB rays, harms the development of a natural tan. Exposure is also liable to bring about a detrimental change in the biomechanical properties of the epidermis, which is reflected by the appearance of wrinkles, leading to premature ageing of the skin. It is also known that UVA rays, with a wavelength of between 320 and 400 nm, penetrate more deeply into the skin than UVB rays. UVA rays bring about immediate and persistent tanning of the skin. Daily exposure to UVA rays, even for a short period, under normal conditions can lead to degradation of the elastin and collagen fibers, which is reflected by a change in the skin’s microrelief, the appearance of wrinkles and uneven pigmentation (liver spots, or heterogeneity of the complexion).

[0007] Protection against UVA and UVB radiation is thus necessary. An effective photoprotective product must protect against both UVA and UVB radiation.

[0008] Many photoprotective compositions have been proposed to date to overcome the effects induced by UVA and / or UVB radiation. They generally contain UV-screening agents that function according to their own chemical nature and their own properties by absorbing, reflecting, or scattering UV radiation, for instance mixtures of liposoluble organic UV-screening agents and / or water-soluble organic UV-screening agents.

[0009] Thus, there is a constant demand for sun protection means for controlling natural tanning in order to control the color of the skin, and for means for maintaining the natural elasticity of the skin.For this purpose, use is generally made of photoprotective compositions comprising UVA-active and / or UVB-active organic screening agents; the degree of UV protection offered by a photoprotective composition being directly related to the amount and types of UV-screening agents that it contains.

[0010] However, solid organic UV-screening agents give rise to problems of dissolution and solubilization in fatty solvents, and also stability problems. These screening agents can in particular recrystallize in the composition during storage. Consequently, there remains a need for stable photoprotective compositions comprising solid organic UV-screening agents that are effectively dissolved and solubilized in the composition.

[0011] Furthermore, the hydrophobic silica aerogel is commonly known in the cosmetic industry for its anti-oil and anti-acne effects, including in sun protection compositions. However, the maximum concentration of silica in a composition is generally limited to around 0.5% by weight of silica, relative to the total weight of the composition because, due to its high hydrophobic properties, the use of high concentrations of silica renders the composition unstable.

[0012] WO 2021 / 016680 discloses an anhydrous composition comprising an organic UV-screening agent, at least 5% by weight of hydrophobic silica aerogel, an amorphous spherical silica and an ester of sebacic acid. However, as demonstrated in the examples described below, when the composition comprises solid lipophilic UV-screening agents, the composition may exhibit stability problems and less effective sun protection.

[0013] However, photoprotective compositions are expected to provide good protection against the sun, which can be determined by the value of the sun protection factor (SPF).

[0014] Consequently, in order to meet the requirements of consumers, there remains a need to obtain photoprotective compositions comprising solid organic UV-screening agents, which possess a high protection efficacy, preferably an SPF value measured in vivo of at least 50, even more preferentially of at least 100, and which remain stable over time. There is also a need for photoprotective compositions with good sensory properties, in particular ease of application of the product and a pleasant, dry, non-tacky and powdery feel.

[0015] Disclosure of the invention

[0016] In light of the above, there remains a need for compositions, notably cosmetic or dermatological compositions, in particular for caring for keratin materials, in particular forprotecting keratin materials against UV radiation, which exhibit high protection, notably having an SPF measured in vitro of at least 100 and which are stable, notably for 2 months at room temperature (25°C) and at 45°C, and which spread well over the skin leaving a homogeneous film.

[0017] The invention is specifically directed toward meeting these needs.

[0018] Summary of the invention

[0019] The inventors have discovered, surprisingly, that these advantageous properties were able to be obtained by adding a semicrystalline C16-C22 alkyl acrylate homopolymer.

[0020] Thus, according to a first aspect, the present invention relates to an anhydrous composition, notably an anhydrous cosmetic or dermatological composition, in particular for caring for keratin materials, notably for caring for the skin, comprising:

[0021] - a solid lipophilic organic UV-screening agent;

[0022] - at least 5% by weight of hydrophobic silica aerogel particles, relative to the total weight of the composition;

[0023] - an amorphous spherical silica;

[0024] - an ester oil; and

[0025] - a semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain.

[0026] The invention also relates to a non-therapeutic cosmetic process for caring for keratin materials, in particular the skin, comprising the application to the keratin materials, in particular the topical application to these keratin materials, of a composition as defined previously.

[0027] The subject of the present invention is also the non-therapeutic use of a composition as described above in the cosmetic field, for caring for keratin materials, in particular the skin of the face and / or of the body, for protecting keratin materials, in particular the skin, when exposed to UV radiation.

[0028] Other features, aspects and advantages of the invention will become apparent on reading the detailed description that follows.

[0029] Detailed description

[0030] The composition according to the invention is preferably a cosmetic or dermatological composition.The composition according to the invention is a non-therapeutic composition.

[0031] The composition according to the invention is generally suitable for topical application to the skin and thus generally comprises a physiologically acceptable medium, i.e. a medium that is compatible with the skin.

[0032] The term "cosmetic or dermatological” refers to a composition that is compatible with the skin, mucous membranes and skin appendages.

[0033] The term "keratin materials” is understood in particular to denote the skin, mucous membranes, fibers, eyelashes and skin appendages.

[0034] The term "the skin” is understood to mean all the skin of the body, and preferably the skin of the face, the scalp, the neckline, the neck, the arms and forearms, the eyelids, around the mouth or behind the ears, the hollow of the elbow, the back of the knees, the hands, the wrists and the ankles, or even more preferably the skin of the face (in particular the forehead, the nose, the cheeks and the chin), the neckline and the neck.

[0035] In the context of the present invention, the terms "preventing” and "prevention” denote the reduction, to a lesser degree, of the risk or probability of occurrence of a given phenomenon. The term "anhydrous” refers to a composition comprising an amount of water of less than or equal to 10% by weight, preferably less than or equal to 5% by weight, even more preferentially less than or equal to 2% by weight, better still less than or equal to 1% by weight, and even better still less than or equal to 0.5% by weight, relative to the total weight of the composition, and more preferentially that is free of water.

[0036] In the context of the invention, the screening efficiency of the composition is evaluated from the evaluation of the SPF and UVAPF.

[0037] For the purposes of the present invention, the term "SPF" means the sun protection factor, which measures the level of protection against UVB rays. The SPF value corresponds to the ratio between the minimum time it takes to obtain a sunburn with a photoprotective composition and the minimum time it takes without a product. More specifically, the term "SPF" is defined in the article A new substrate to measure sunscreen protection factors throughout the ultraviolet spectrum, J. Soc. Cosmet. Chem., 40, 127-133 (May / June 1989). The SPF (Sun Protection Factor) may be evaluated in vitro using the Labsphere® spectrophotometer. A protocol for evaluating the in vitro SPF is described below, in the examples. According to this protocol, the composition has high sun protection when its in vitro SPF is greater than 100%. The SPF (Sun Protection Factor) may be evaluated in vitrousing the Labsphere® spectrophotometer. One particular protocol, certified under the standard ISO 23675:2024, is presented as an example.

[0038] The evaluation of the sun protection factor (SPF) of the compositions can also be performed in vivo according to the ISO 24444: 2019 protocol “Cosmetics - Sun protection test methods - In vivo determination of the sun protection factor (SPF)”. A protocol for evaluating the in vivo SPF is described below, in the examples. According to this protocol, the composition has high sun protection when its in vivo SPF is greater than 50.

[0039] For the purposes of the present invention, the term “UVAPF” means the index characterizing the protection against UVA rays. In particular, this index can be measured in vivo according to the ‘'PPD'’ (Persistent Pigment Darkening) method, ISO-24442:2022 protocol, and measures the color of the skin observed 2 to 4 hours after exposure to UVA rays. The protection against UVA rays can also be evaluated in vitro using the Labsphere® spectrophotometer.-The ISO 24443:2021 protocol describes such an in vitro method.

[0040] Solid lipophilic organic UV-screening agents

[0041] The composition according to the invention comprises at least one solid lipophilic organic UV-screening agent. The term "UV-screening agent" is understood to mean a compound which substantially attenuates ultraviolet radiation.

[0042] A “ lipophilic organic screening agent' is understood to mean any cosmetic organic compound for screening out UV radiation, which can be fully dissolved in molecular form in a liquid fatty phase or else which can be solubilized in colloidal form (for example in micellar form) in a liquid fatty phase.

[0043] For the purposes of the present invention, a “ solid lipophilic organic UV-screening agent' is understood to mean a lipophilic organic UV-screening agent which, at room temperature (25°C) and atmospheric pressure (760 mmHg), is in solid form; the solid lipophilic organic UV-screening agent optionally being malleable. It may in particular be in powder form.

[0044] The solid lipophilic organic UV-screening agent is chosen from UVA-active and / or UVB-active organic UV-screening agents.

[0045] The solid lipophilic organic UV-screening agents are chosen in particular from anthranilate compounds; dibenzoylmethane compounds; benzylidene camphor compounds; benzophenone compounds; triazine compounds; benzotriazole compounds; benzimidazolederivatives; imidazoline compounds; bis-benzazolyl compounds, such as those described in patents EP 669323 and US 2,463,264; and mixtures thereof.

[0046] Preferably, the solid lipophilic organic UV-screening agent is chosen from dibenzoylmethane compounds, benzylidene camphor compounds, benzophenone compounds, triazine compounds, benzotriazole compounds, and mixtures thereof.

[0047] As examples of solid lipophilic organic UV-screening agents, mention may be made of those denoted hereinbelow under their INCI name and / or their chemical name.

[0048] Dibenzoylmethane compounds:

[0049] Butyl Methoxy dibenzoylmethane notably sold under the trade name Parsol® 1789 by the company DSM Nutritional Products.

[0050] Benzophenone compounds:

[0051] - Benzophenone-3 or Oxybenzone, sold under the trade name Uvinul® M 40 by the company BASF,

[0052] - Benzophenone- 1,

[0053] - Diethylamino Hydroxybenzoyl Hexyl Benzoate sold under the trade name Uvinul® A Plus.

[0054] Benzylidene camphor compounds:

[0055] 4-Methylbenzylidene Camphor, sold under the name Eusolex® 6300 by the company Merck.

[0056] Phenylbenzotri azole compounds:

[0057] Drometrizole Trisiloxane manufactured under the name Mexoryl® XL by the company Noveal.

[0058] Methylenebisthydroxyphenylbenzotri azole) compounds:

[0059] Methylene Bis-Benzotriazolyl Tetramethylbutylphenol notably in solid form, such as the product sold under the trade name Mixxim BB / 100® by the company Fairmount Chemical.

[0060] Triazine compounds:

[0061] - 3,3’-(l,4-Phenylene)bis(5,6-diphenyl-l,2,4-triazine), having the INCI name Phenylene Bis-Diphenyl Triazine,

[0062] - Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine sold under the trade name Tinosorb® S by the company BASF,

[0063] - Ethylhexyl Triazone, notably sold under the trade name Uvinul® T 150 by the company BASF,

[0064] - Diethylhexyl Butamido Triazone sold under the trade name Uvasorb® HEB by the company 3V Sigma.Anthranilic compounds:

[0065] Menthyl anthranilate sold under the trade name Neo Heliopan® MA by Symrise.

[0066] According to a preferred embodiment, the solid lipophilic organic UV-screening agent is chosen from dibenzoylmethane compounds, benzophenone compounds, phenylbenzotri azole compounds, triazine compounds, and mixtures thereof, and preferably chosen from bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, butyl methoxydibenzoylmethane, diethylamino hydroxybenzoyl hexyl benzoate and ethylhexyl triazone and mixtures thereof.

[0067] The solid lipophilic organic screening agent(s) may be present in the composition in a content ranging from 5% to 25% by weight, preferably from 10% to 20% by weight, relative to the total weight of the composition.

[0068] According to a particular embodiment, the composition may comprise one or more liquid lipophilic organic UV-screening agents in a content of less than 2% by weight, in particular less than 1% by weight, preferably less than 0.5% by weight, relative to the total weight of the composition, and more preferentially, the composition according to the invention is free of liquid lipophilic organic UV-screening agent. For the purposes of the present invention, a “liquid lipophilic organic UV-screening agent” is understood to mean a lipophilic organic UV-screening agent which, at room temperature (25°C) and atmospheric pressure (760 mmHg), is liquid.

[0069] The liquid lipophilic organic UV-screening agents are chosen in particular from cinnamic compounds; salicylic compounds; P,P-diphenylacrylate compounds; benzalmalonate compounds, in particular those cited in patent US 5624663; methylenebis(hydroxyphenylbenzotriazole) compounds, as described in applications US 5,237,071, US 5,166,355, GB 2303549, DE 197 26 184 and EP 893119; benzoxazole compounds, as described in patent applications EP 0832642, EP 1027883, EP1300137 and DE 10162844; screening polymers and screening silicones, such as those described in particular in application WO-93 / 04665; dimers derived from a-alkyl styrene, such as those described in patent application DE19855649; 4,4-diarylbutadiene compounds, as described in applications EP 0967200, DE 19746654, DE 19755649, EP-A-1008586, EP 1133980 and EP 133981, and mixtures thereof.As examples of liquid lipophilic organic UV-screening agents, mention may be made of those denoted hereinbelow under their INCI name and / or their chemical name.

[0070] Cinnamic compounds:

[0071] - Ethylhexyl Methoxycinnamate notably sold under the trade name Parsol® MCX by the company DSM Nutritional Products;

[0072] - Isoamyl p-Methoxy cinnamate, sold under the trade name Neo Heliopan E 1000® by the company Symrise.

[0073] Salicylic compounds:

[0074] - Homosalate sold under the name Parsol® HMS by the company DSM Nutritional Products, - Ethylhexyl Salicylate sold under the name Neo Heliopan® OS by the company Symrise.

[0075] (FB-Diphenylacrylate compounds:

[0076] Octocrylene, notably sold under the trade name Uvinul® N 539 T by the company BASF.

[0077] Benzalmalonate compounds:

[0078] Polyorganosiloxane bearing benzalmalonate functions, such as Polysilicone-15, sold under the trade name Parsol SLX® by the company Hoffmann-LaRoche.

[0079] According to one particular embodiment, the composition may comprise one or more water-soluble organic UV-screening agents in a content of less than 2% by weight, in particular less than 1% by weight, preferably less than 0.5% by weight, relative to the total weight of the composition, and more preferentially, the composition according to the invention is free of water-soluble organic UV-screening agent.

[0080] According to one particular embodiment, the composition may comprise one or more water-dispersible organic UV-screening agents in a content of less than 2% by weight, in particular less than 1% by weight, preferably less than 0.5% by weight, relative to the total weight of the composition, and more preferentially, the composition according to the invention is free of water-dispersible organic UV-screening agent.

[0081] In particular, the composition may comprise one or more inorganic screening agents in a content of less than 2% by weight, in particular less than 1% by weight, preferably less than 0.5% by weight, relative to the total weight of the composition, and more preferentially, the composition according to the invention is free of inorganic screening agent.According to a preferred embodiment, the composition comprises a content of liquid lipophilic organic UV-screening agents, water-soluble organic UV-screening agents, water-dispersible organic UV-screening agents and inorganic screening agents of less than 2% by weight, in particular less than 1% by weight, preferably less than 0.5% by weight, relative to the total weight of the composition, and more preferentially, the composition according to the invention is free of such UV-screening agents.

[0082] Hydrophobic silica aerogel

[0083] The composition according to the invention contains a hydrophobic silica aerogel in a content of at least 5% by weight relative to the total weight of the composition.

[0084] A silica aerogel according to the present invention is a porous material obtained by replacing (by drying) the liquid component of a silica gel with air.

[0085] Silica aerogels are generally synthesized by a sol -gel process in a liquid medium and then dried, usually by extraction with a supercritical fluid, such as, but not limited to, supercritical carbon dioxide (CO2). This type of drying avoids shrinkage of the pores and the material. The sol-gel process and the various drying processes are described in detail in Brinker C.J. and Scherer G.W., Sol-Gel Science, New York, Academic Press, 1990.

[0086] The hydrophobic silica aerogel particles used in the present invention have a specific surface area per unit of mass (SM) ranging from 500 to 1500 m2 / g, or alternatively from 600 to 1200 m2 / g, preferably from 600 to 800 m2 / g, and a size, expressed as the volume-mean diameter (D[0.5]), ranging from 1 to 30 pm, in particular from 5 to 25 pm, preferably from 5 to 20 pm and better still from 5 to 15 pm. The specific surface area per unit mass may be determined by the BET (Brunauer-Emmett-Teller) nitrogen absorption method described in the Journal of the American Chemical Society, vol. 60, page 309, February 1938 and corresponding to international standard ISO 5794 / 1. The BET specific surface area corresponds to the total specific surface area of the particles under consideration.

[0087] The size of the particles can be measured by static light scattering using a commercial particle size analyzer such as the MasterSizer 2000 from Malvern. The data are processed on the basis of the Mie scattering theory. This theory, which is exact for isotropic particles, makes it possible to determine, in the case of non-spherical particles, an “effective” particle diameter. This theory is notably described in the publication by Van de Hulst, H.C., Light Scattering by Small Particles, Chapters 9 and 10, Wiley, New York, 1957.The particles used in the present invention may advantageously have a tapped density ranging from 0.04 g / cm3to 0.10 g / cm3or alternatively from 0.05 g / cm3to 0.08 g / cm3. In the context of the present invention, this density, referred to as tapped density, can be evaluated according to the following protocol: 40 g of powder are poured into a measuring cylinder; the measuring cylinder is then placed on a Stampf Volumeter Stav 2003 machine; the measuring cylinder is then subjected to a series of 2500 tapping movements (this operation is repeated until the difference in volume between two consecutive tests is less than 2%); the final volume Vf of tapped powder is then measured directly on the measuring cylinder. The tapped density is determined by the ratio m / Vf, in this instance 40 / Vf (Vf being expressed in cm3and m in g).

[0088] According to one embodiment, the hydrophobic silica aerogel particles used in the present invention have a specific surface area per unit of volume SV ranging from 5 to 60 m2 / cm3, in particular from 10 to 50 m2 / cm3, preferably from 15 to 40 m2 / cm3. The specific surface area per unit of volume is given by the following relationship SV = SM.r where r is the tapped density expressed in g / cm3and SM is the specific surface area per unit of mass expressed in m2 / g, as defined above.

[0089] In certain embodiments, the silica aerogel particles according to the invention have an oil absorption capacity, measured at the wet point, ranging from about 5 to about 18 ml / g, or alternatively from about 6 to about 15 ml / g, or alternatively from about 8 to about 12 ml / g. The oil absorption capacity measured at the wet point, denoted Wp, corresponds to the amount of oil which it is necessary to add to 100 g of particles in order to obtain a homogeneous paste. The Wp is measured according to the wet point method or the method for determining the oil absorption of a powder described in the standard NF T 30-022. Wp corresponds to the amount of oil adsorbed onto the available surface of the powder and / or absorbed by the powder by measuring the wet point, described below: An amount = 2 g of powder is placed on a glass plate, then the oil (isononyl isonanoate) is added dropwise. After having added 4 to 5 drops of oil to the powder, mixing is performed using a spatula, and oil continues to be added until a conglomerate of oil and powder has been formed. At this stage, the oil is added one drop at a time and the mixture is then triturated using the spatula. The addition of oil is stopped when a firm and smooth paste is obtained. This paste must be able to be spread over the glass plate without cracking or forming lumps. The volume Vs (expressed in ml) of oil used is then noted. The oil absorption corresponds to the ratio Vs / m.The term “hydrophobic silica” denotes any silica, the surface of which is treated with silylating agents, for example with halogenated silanes, such as alkylchlorosilanes, siloxanes, in particular dimethylsiloxanes such as hexamethyldisiloxane, or silazanes, so as to functionalize the OH groups with silyl groups Si-Rn, for example trimethyl silyl groups. The preparation of hydrophobic silica aerogel particles, the surface of which has been modified by silylation, is described in patent US 7 470 725. Preferably, use is made of hydrophobic silica aerogel particles, the surface of which has been modified with trimethyl silyl groups (which have the INCI name: SILICA SILYLATE).

[0090] Suitable examples of hydrophobic silica aerogels may include, without being limited thereto, aerogels sold under the trade names DOWSIL® VM-2270 Aerogel Fine particles (INCI name: Silica Silylate) by DOW. The VM-2270 particles have a mean size of between 5 and 15 microns and a specific surface area per unit of mass of between 600 and 800 m2 / g. Another suitable example of hydrophobic silica aerogels may include the commercially available aerogels from Cabot Corporation under the trade names Aerogel TLD 201, Aerogel OGD 201 and Aerogel TLD 203, Enova® Aerogel MT 1100 and Enova® Aerogel MT 1200. Use is preferably made of the hydrophobic silica aerogel particles DOWSIL® VM-2270 Aerogel Fine particles.

[0091] The hydrophobic silica aerogel may be present in the composition in a content ranging from 5% to 10% by weight, preferably from 5% to 8% by weight, more preferentially from 5% to 7% by weight, relative to the total weight of the composition.

[0092] Amorphous spherical silica

[0093] The composition according to the invention comprises at least one amorphous spherical silica.

[0094] According to certain embodiments, the mean size of these spherical amorphous silica particles is less than 15.0 pm and more particularly between 3 and 10 pm.

[0095] Examples of amorphous spherical silicas that may be mentioned include the porous silica microspheres sold under the name Silica Beads SB-700 by Myoshi (mean size of 4.6 pm and oil absorption capacity Wp: 133 ml / 100 g); Sunsphere® H51 (mean size of 5.1 pm and oil absorption capacity Wp: 133 ml / 100 g), Sunsphere® H33 (mean size of 2.9 pm and oil absorption capacity Wp: 370 ml / 100 g) by Asahi Glass.The amorphous spherical silica may be present in the composition according to the invention in a content ranging from 1% to 6% by weight, preferably ranging from 2% to 5% by weight, relative to the total weight of the composition.

[0096] According to a particular embodiment, a composition according to the invention comprises at least:

[0097] - from 5% to 25% by weight, in particular from 10% to 20% by weight, relative to its total weight, of solid lipophilic organic UV-screening agent(s), preferably chosen from dibenzoylmethane compounds, benzophenone compounds, phenylbenzotri azole compounds, triazine compounds, and mixtures thereof;

[0098] - from 5% to 10% by weight, relative to its total weight, of hydrophobic silica aerogel, preferably hydrophobic silica aerogel of which the surface has been modified with trimethyl silyl groups;

[0099] - from 1% to 6% by weight, in particular from 2% to 5% by weight, relative to its total weight, of amorphous spherical silica(s).

[0100] Ester oil

[0101] The composition according to the invention comprises at least one ester oil.

[0102] According to a particular embodiment of the invention, the ester oil(s) do not absorb UV rays.

[0103] An ester oil which does not absorb UV rays is understood to mean oils comprising at least one ester function, which do not absorb or do not scatter ultraviolet radiation appreciably. The term “oiF means a water-immiscible non-aqueous compound that is liquid at room temperature (20°C±5°C) and at atmospheric pressure (760 mmHg).

[0104] The ester oil is preferably chosen from monoester oils, diester oils, synthetic triglycerides such as triglycerides of capric and caprylic acids, and mixtures thereof.

[0105] The ester oil may be chosen from the monoesters of formula R-C(O)-OR’ in which R-C(O)-O- represents the carboxylic acid residue containing from 2 to 40 carbon atoms, and R’ represents a hydrocarbon-based chain containing from 1 to 40 carbon atoms. As examples of such esters, mention may for example be made of isoamyl laurate, cetostearyl octanoate, isopropyl stearate or isostearate, ethyl palmitate, 2-ethylhexyl palmitate, isostearyl isostearate, octyl stearate, isostearyl heptanoate, cetyl octanoate, cocoyl capryl ate / caprate, tridecyl octanoate, 2-ethylhexyl palmitate, C12-C15 alkyl benzoate, hexyl laurate,neopentanoic acid esters, such as isodecyl neopentanoate, isotridecyl neopentanoate, isostearyl neopentanoate or 2-octyldodecyl neopentanoate, isononanoic acid esters, such as isononyl isononanoate, isotridecyl isononanoate or octyl isononanoate, oleyl erucate, isocetyl stearate, isodecyl neopentanoate, isostearyl behenate, myristyl myristate, isopropyl myristate, isopropyl palmitate, and mixtures thereof.

[0106] The diester oils may be chosen from diesters of a C2-C16 dicarboxylic acid and of a C1-C4 monoalcohol, such as, for example, diisopropyl sebacate and diisopropyl adipate.

[0107] According to certain embodiments, the composition comprises, as ester oil, an oil chosen from isopropyl palmitate, isopropyl myristate, isononyl isononanoate, C12-C15 alkyl benzoates, diisopropyl adipate, diisopropyl sebacate, triglycerides of capric and caprylic acids, and mixtures thereof, preferably chosen from isopropyl palmitate, isopropyl myristate, isononyl isononanoate, C12-C15 alkyl benzoates, diisopropyl adipate, diisopropyl sebacate, and mixtures thereof, and more preferentially the composition comprises, as ester oils, the mixture of isopropyl palmitate, isopropyl myristate, isononyl isononanoate, C12-C15 alkyl benzoate, diisopropyl adipate, and diisopropyl sebacate.

[0108] The ester oil(s) may be present in a content ranging from 40% to 90% by weight, preferably from 50% to 80% by weight, and better still from 55% to 75%, relative to the total weight of the composition.

[0109] In particular, isopropyl myristate may be present in a content ranging from 15% to 35% by weight, in particular from 20% to 30% by weight, preferably from 20% to 27% by weight relative to the total weight of the composition.

[0110] According to one embodiment, diisopropyl sebacate and diisopropyl adipate are present in a weight ratio ranging from 0.5 to 1.5, preferably ranging from 0.8 to 1.2, and preferentially ranging from 0.9 to 1.1.

[0111] Semicrystalline homopolymers

[0112] The composition according to the invention comprises at least one semicrystalline homopolymer containing at least one alkyl acrylate chain, in particular the alkyl group being a C16-C22 alkyl group.

[0113] For the purposes of the invention, the term “semicrystalline polymer” means polymers including a crystallizable portion, pendent chain orblock in the backbone, and an amorphousportion in the backbone, and having a reversible first-order phase transition temperature, in particular of melting (solid-liquid transition).

[0114] In particular, the semicrystalline polymer containing at least one alkyl acrylate chain has an average molecular mass (Mn) of greater than or equal to about 2000 g / mol, preferably from about 2000 to 800000 g / mol, preferably from about 3000 to 500000 g / mol, preferably from about 4000 to 150000 g / mol, and preferably from about 4000 to 99 000 g / mol.

[0115] Aside from the crystallizable chains or blocks, the blocks of the polymers are amorphous. For the purposes of the invention, the term “crystallizable chain or block” is understood to mean a chain or block which, if it were alone, would change from the amorphous state to the crystalline state reversibly, depending on whether the temperature is above or below the melting point. For the purposes of the invention, a chain is a group of atoms, which is pendent or lateral relative to the polymer backbone. A block is a group of atoms belonging to the backbone, this group constituting one of the repeating units of the polymer. Advantageously, the “pendent crystallizable chain” may be a chain including at least 6 carbon atoms.

[0116] Preferably, the polymer backbone of the semicrystalline polymers is soluble in the oily phase.

[0117] Preferably, the semicrystalline homopolymers containing at least one alkyl acrylate chain are non-crosslinked.

[0118] According to a particular embodiment, the semicrystalline homopolymer containing at least one alkyl acrylate chain is derived from a monomer bearing crystallizable chain(s) chosen from saturated alkyl (meth)acrylates and even more particularly poly(stearyl acrylate)s or poly(behenyl acrylate)s.

[0119] Preferably, the semicrystalline homopolymer containing at least one alkyl acrylate chain is chosen from:

[0120] - homopolymers obtained by polymerization of a monomer chosen from C16-C22 alkyl acrylates, preferably stearyl acrylates and behenyl acrylates, and C16-C22 alkyl methacrylates; and

[0121] - mixtures thereof.

[0122] As a particular example of a semicrystalline polymer, mention may be made of the homopolymers obtained by polymerization of a monomer chosen from alkyl acrylates and alkyl methacrylates, preferably from stearyl acrylates and behenyl acrylates, such as the product TEGO® SP 13-1 or TEGO® SP13-1 MB (formerly Intelimer® IP A 13-1) which is apolystearyl acrylate, or the product TEGO® SP 13-6 (formerly Intelimer® IP A 13-6) which is a behenyl polymer (polybehenyl acrylate), or the product TEGO® SP 13 Sun up MB, sold by the company Evonik.

[0123] These polymers have the INCI name: POLY C10-30 ALKYL ACRYLATE.

[0124] According to a particular embodiment, the semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain is chosen from polystearyl acrylates, polybehenyl acrylates, and mixtures thereof.

[0125] According to a preferred embodiment, the semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain is chosen from polystearyl acrylates.

[0126] The semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain may be present in the composition according to the invention in a content ranging from 0.1% to 10% by weight, preferably ranging from 0.2% to 8% by weight, and better still ranging from 0.5% to 6% by weight, relative to the total weight of the composition.

[0127] According to a particular embodiment, a composition according to the invention comprises at least:

[0128] - from 5% to 25% by weight, in particular from 10% to 20% by weight, relative to its total weight, of solid lipophilic organic UV-screening agent(s), preferably chosen from dibenzoylmethane compounds, benzophenone compounds, phenylbenzotri azole compounds, triazine compounds, and mixtures thereof;

[0129] - from 5% to 10% by weight, relative to its total weight, of hydrophobic silica aerogel, preferably silica aerogel of which the surface has been modified with trimethyl silyl groups; - from 1% to 6% by weight, in particular from 2% to 5% by weight, relative to its total weight, of amorphous spherical silica(s);

[0130] - from 40% to 90% by weight, preferably from 50% to 80% by weight, better still from 55% to 75% by weight, relative to its total weight of ester oil(s) which do not absorb UV rays; and

[0131] - from 0.1% to 10% by weight, preferably from 0.2% to 8% by weight, relative to its total weight, of semicrystalline homopolymer(s) containing at least one C16-C22 alkyl acrylate chain.

[0132] C2-C4 monoalcohol

[0133] The composition according to the invention may comprise a C2-C4 monoalcohol.Preferably, the C2-C4 monoalcohol is chosen from saturated or unsaturated, linear or branched monoalcohols comprising from 2 to 4 carbon atoms, and mixtures thereof.

[0134] In particular, the C2-C4 monoalcohol can be chosen from ethanol, isopropanol, n-propanol, tert-butanol, butanol and mixtures thereof, and preferably ethanol.

[0135] Advantageously, the C2-C4 monoalcohol can be present in a content ranging from 0.5% to 10% by weight and preferably from 1% to 5% by weight, relative to the total weight of the composition.

[0136] Volatile oil

[0137] The composition according to the invention may comprise a volatile oil, preferably a volatile hydrocarbon oil.

[0138] The term “volatile oiV denotes an oil with a non-zero vapor pressure, at 20°C and atmospheric pressure, ranging in particular from 2.66 Pa to 40000 Pa, in particular ranging up to 13 000 Pa, and more particularly ranging up to 1300 Pa (standard OECD 104).

[0139] The volatile oil may be chosen from hydrocarbon oils containing from 8 to 16 carbon atoms, in particular branched Cs-Ci6 alkanes, in particular isoalkanes, more particularly isoalkanes (also known as isoparaffins), preferably C13-C16 isoparaffins, isododecane, isodecane, isohexadecane, for example the oils sold under the trade names Isopar or Permethyl, alone or as mixtures, preferably isododecane (also known as 2,2,4,4,6-pentamethylheptane); linear alkanes, in particular C11-C16 alkanes, alone or as mixtures, in particular hexane, decane, undecane, tridecane, n-dodecane (C12) and n-tetradecane (C14), mixtures of n-undecane (Cn) and n-tridecane (C13), and mixtures thereof, preferably isododecane and isohexadecane, and even more preferentially isododecane.

[0140] The volatile oil may be present in a content ranging from 0.5% to 10% by weight and preferably from 1% to 5% by weight, relative to the total weight of the composition.

[0141] Starch

[0142] The composition of the present invention may comprise a starch.

[0143] The starch molecules that can be used in the present invention may originate from any plant source of starch, notably cereals and tubers; more particularly, they may be starches from corn, rice, cassava, barley, potato, wheat, sorghum, pea, oat or tapioca. Use may also be made of the hydrolysates of the starches mentioned above.Preferably, the starch is chosen from corn starches, rice starches, potato starches and mixtures thereof, and more preferentially, the starch is derived from corn or potato.

[0144] Use may be made of the corn starch sold under the trade name Beaute by Roquette® ST005 by Roquette.

[0145] The starch may be present in a content ranging from 0.5% to 10% by weight, preferably from 1% to 5% by weight, relative to the total weight of the composition.

[0146] Additional adjuvants or additives

[0147] The composition of the present invention may also comprise conventional cosmetic adjuvants or additives, for example fragrances, chelating agents, preserving agents and bactericides, surfactants, co-emulsifiers and / or thickeners, pH regulators, and mixtures thereof.

[0148] A person skilled in the art can select the amount of additional adjuvants or additives so as not to adversely affect the end use of the composition according to the present invention.

[0149] Uses and processes

[0150] According to one of its aspects, the present invention relates to the non-therapeutic use of a composition as defined above in the cosmetic field, in particular for caring for keratin materials, in particular the skin of the face and / or of the body, for protecting keratin materials, in particular the skin, when exposed to UV radiation.

[0151] According to another of its aspects, the present invention relates to a cosmetic process for caring for keratin materials, in particular the skin, comprising the application to the keratin materials, in particular the topical application to these keratin materials, of a composition as defined in the present invention.

[0152] According to one aspect, the invention also relates to a non-therapeutic cosmetic process for limiting the darkening of the skin and / or improving the color and / or uniformity of the complexion, comprising the application, to the surface of the keratin materials, in particular the skin, of at least one cosmetic composition as defined previously.

[0153] The invention also relates to a non-therapeutic cosmetic process for preventing the signs of ageing of the keratin materials, in particular the skin, comprising the application to the surface of the keratin materials of at least one cosmetic composition as defined previously. The cosmetic uses and processes considered according to the invention are non-therapeutic.The cosmetic use or process of the invention is performed by topically administering a composition according to the invention.

[0154] Topical administration consists of the external application to the skin of cosmetic compositions according to the usual techniques for the use of these compositions.

[0155] Throughout the description, including the claims, the terms “between ... and ...”, and “ranging from ... to ...” should be understood as meaning limits included, unless otherwise specified.

[0156] The invention is illustrated in greater detail in the examples that follow. The amounts are indicated as percentages by weight.

[0157] Examples

[0158] Methods and Measurements

[0159] 1. Protocol for measuring the in vitro SPF

[0160] The sun protection factor (SPF) is determined using the “zw vitro" method described by M. Pissavini et al. in the International Journal of Cosmetic Science, 40, 263-268 (2018), based on the initial absorbance.

[0161] Each composition is applied to six rough PMMA (polymethyl methacrylate) plates, in the form of a homogeneous and even deposit in a proportion of 1 mg / cm2. Each composition is spread using an automated robot which makes regular and uniform movements on three “HD6” plates (molded rough plates) and three “SB6” plates (sandblasted rough plates). The plates are weighed before and after spreading. Once the six plates have been spread, they are left to stand in Thermaster chambers in the dark at 25°C for 30 minutes. Measurements are taken using a UV-1000S spectrophotometer from the company Labsphere. Nine measurements are taken per plate, and are then analyzed using an Excel spreadsheet which provides the SPF values for the composition measured.

[0162] 2, Protocol for measuring the in vivo SPF

[0163] The evaluation of the Sun Protection Factor (SPF) of the compositions is performed in vivo according to the ISOZEN 24444 “Cosmetics - Sun protection test methods - In vivo determination of the sun protection factor (SPF) (2019)” method.The application of an antisun product is an important step, as it has a significant impact on the SPF result. It must therefore be standardized and performed under the most favorable conditions possible.

[0164] This application is performed on the backs of 3 to 10 volunteers.

[0165] Areas of 30 cm2on the back will be selected between the shoulder blades and the lower back for application of the products.

[0166] These areas must be free of spots, hairs, fuzz, moles or scars and must have a uniform color. When positioning the volunteer, the back must be perfectly flat.

[0167] There must be a minimum gap of 1 cm between each area. These areas, each measuring 30 cm2, should be drawn between the shoulder blades and the lower back. Before taking up any sample, and unless otherwise indicated, it is important to shake the product well so as to obtain good homogenization of the emulsion.

[0168] Saturation of the sampling instrument (pipette or syringe) must be performed for taring. Double weighing is necessary so as to ensure that the correct amount of product is applied. The application pre-tests allowed the amount of product to be taken up to be evaluated, so as to ensure that 2 mg / cm2± 2.5% are indeed applied.

[0169] It is possible for the product to be applied with or without a finger stall. In the case of application with a finger stall, this must be tautly stretched over the pad of the finger so as to avoid excessive loss of product and to perform the application under optimum conditions. The water will always be applied with the finger stall. Throughout the application, it is recommended to use light pressure, not to retrace the movement or to remove the finger, and to adhere to an application time of between 20 and 50 seconds.

[0170] The drops of product to be applied must be deposited evenly over the entire area and be of a uniform size. Care should be taken to ensure that the drops are not too close to the edges of the area to avoid excessive over-running during application.

[0171] During application, a certain number of factors need to be taken into account: the pressure applied must be light, and circular movements are essential. Ideally, it is necessary to start with small circles and widen them within the area, always in the same direction, moving gradually toward the other end of the area. To avoid excessive concentration of product in the center, care must be taken to ensure that the product is drawn right up to the edge. Linear movements, for the finishing step, must be straight. It is recommended to perform this step quickly so as not to impair the homogeneity of the deposit.3 , Stability monitoring protocol

[0172] The stability evaluation protocol is detailed below:

[0173] A composition is prepared and then stored at various temperatures:

[0174] i) at room temperature (25°C),

[0175] ii) at 45°C in an oven.

[0176] The composition is then evaluated as follows: after storing for 2 months, the appearance of the composition is characterized.

[0177] The appearance of the composition must remain identical or close to the initial appearance. In particular, the composition, in the form of a gel, must not exhibit leaching or sedimentation. Slight leaching or slight sedimentation remain acceptable.

[0178] Example 1: Preparation of the compositions

[0179] Compositions II to 16 according to the invention and compositions Cl to C3 outside of the invention are prepared according to the protocol described below. The nature of the ingredients and their respective amounts are given in Table 1. The contents are expressed as weight percentages relative to the total weight of the composition.

[0180] Preparation of compositions II to 16 and Cl to C3

[0181] The compounds of phase Al are heated to 75°C in a Minilab mixer with blade stirring at 60 rpm and impeller stirring at 2000 rpm. The mixture is left to homogenize for 10 minutes, then cooled to 30°C with blade stirring. The compounds of phase A2 are added with blade stirring at 60 rpm, then the compounds of phase B are added with blade stirring at 60 rpm and impeller stirring at 4000 rpm for 5 minutes. Next, the compounds of phase C are added with blade stirring at 60 rpm, then the compounds of phase D are added with blade stirring at 60 rpm and impeller stirring at 4000 rpm for 5 to 10 minutes. Finally, the compounds of phase E are added with blade stirring at 60 rpm and impeller stirring at 4000 rpm for 5 minutes.

[0182] [Table 1]Phase Compounds II 12 13 14 15 16 Cl C2 C3 Bis-ethylhexyloxyphenol

[0183] 4.0 4.0 4.0 4.5 4.5 4.0 4.0 4.0 4.0 methoxyphenyl triazine

[0184] Drometrizole trisiloxane 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Butyl

[0185] 4.5 4.5 4.5 4.0 4.0 4.5 4.5 4.5 4.5 methoxydibenzoylmethane

[0186] Diethylamino

[0187] hydroxybenzoyl hexyl - - - 0.50 0.50 - - - - benzoate

[0188] Ethylhexyl triazone 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 Al Diisopropyl sebacate 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 C12-C15 alkyl benzoate 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8 Behenyl acrylate / 2- hydroxyethyl acrylate - - - - - - - 1.0 - copolymer (*)

[0189] Isopropyl myristate 24.20 25.45 24.55 24.05 23.95 21.45 26.45 25.45 25.45 Diisopropyl adipate 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 10.0 Isononyl isononanoate 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 8.3 Poly C10-C30 alkyl

[0190] acrylate (TEGO® SP 13-1 1.0 1.0 1.0 1.0 1.0 5.0 - - 1.0 from Evonik)

[0191] Isopropyl palmitate 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 A2 Tocopherol 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Silica (Sunsphere® H51

[0192] 3.0 3.0 3.0 3.0 3.0 3.0 3.0 3.0 8.25 Asahi Glass')

[0193] B Com starch (Beaute by

[0194] Roquette® ST005 from 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Roquette)

[0195] C Isododecane 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 Hydrophobic silica aerogel

[0196] (DOWSIL® VM-2270

[0197] D 6.5 5.25 6.15 6.15 6.25 5.25 5.25 5.25 - Aerogel Fine Particles

[0198] from Dow)

[0199]

[0200] E Ethanol 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3

[0201] (*) the synthesis of the polymer is described in FR3146591 Al in the example of the preparation of polymer 1.

[0202] Example 2: Measurement of the in vitro SPF

[0203] The in vitro SPF measurements are carried out, for each of the compositions II to 16 and Cl to C3 according to the protocol described above. The results obtained are given in Table 2.[Table 2]

[0204] Mean in vitro SPF value (double Composition

[0205] approach)

[0206] II 100 +

[0207] 12 100 +

[0208] 13 100 +

[0209] 14 100 +

[0210] 15 100 +

[0211] 16 100 +

[0212] Cl 79

[0213] C2 67

[0214]

[0215] C3 75

[0216] It appears that the compositions II to 16 according to the invention have an in vitro SPF of greater than 100; they therefore have a high sun protection.

[0217] On the contrary, the comparative compositions Cl, devoid of polymer according to the invention, C2, devoid of polymer according to the invention and comprising a polymer outside the invention, and C3, containing no hydrophobic silica aerogel particles, have an in vitro SPF of less than 80 and therefore a much lower sun protection than the compositions according to the invention.

[0218] Example 3: Stability monitoring measurement

[0219] The stability monitoring measurements are carried out, for each of the compositions II to 16 and Cl to C3 according to the protocol described above. The results obtained are given in Table 3.[Table 3]

[0220] Appearance after storage for 2 Appearance after storage for 2 Compositions

[0221] months at room temperature months at 45°C

[0222] II The gel is compliant The gel is compliant The gel is compliant and exhibits 12 The gel is compliant

[0223] slight sedimentation of the fillers The gel is compliant and exhibits The gel is compliant and exhibits 13

[0224] slight leaching at the surface slight gelled leaching at the surface The gel is compliant and exhibits

[0225] 14 The gel is compliant slight leaching at the surface

[0226] 15 The gel is compliant The gel is compliant The gel is compliant and exhibits The gel is compliant and exhibits 16

[0227] slight leaching at the surface slight gelled leaching at the surface The gel is non-compliant and The gel is non-compliant and Cl

[0228] exhibits leaching and sedimentation exhibits leaching and sedimentation The gel is non-compliant and The gel is non-compliant and C2

[0229] exhibits significant leaching exhibits significant leaching The composition is liquid, non- The gel is non-compliant and C3 compliant and exhibits

[0230] exhibits sedimentation of the fillers sedimentation of the fillers

[0231]

[0232] It appears that compositions II to 16 according to the invention remain stable after storage for 2 months at room temperature and at a temperature of 45°C.

[0233] However, the comparative compositions Cl, devoid of polymer according to the invention, C2, devoid of polymer according to the invention and comprising a polymer outside the invention, and C3, containing no hydrophobic silica aerogel particles, have an highly degraded appearance after storage at these temperatures and are therefore not stable.

[0234] Moreover, compositions II to 16 according to the invention spread easily on the skin and form a homogeneous film, thus conferring effective sun protection. They also give the skin a pleasant, dry, non-tacky and powdery feel.

Claims

Claims1. An anhydrous composition, notably a cosmetic or dermatological anhydrous composition, in particular for caring for keratin materials, notably for caring for the skin, comprising:- at least one solid lipophilic organic UV-screening agent;- at least 5% by weight of hydrophobic silica aerogel particles, relative to the total weight of the composition;- at least one amorphous spherical silica;- at least one ester oil; and- at least one semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain.

2. The composition as claimed in claim 1, said solid lipophilic organic UV-screening agent being chosen from dibenzoylmethane compounds, benzophenone compounds, phenylbenzotri azole compounds, triazine compounds, and mixtures thereof, and preferably chosen from bis-ethylhexyloxyphenol methoxyphenyl triazine, drometrizole trisiloxane, butyl methoxydibenzoylmethane, diethylamino hydroxybenzoyl hexyl benzoate and ethylhexyl triazone and mixtures thereof.

3. The composition as claimed in claim 1 or 2, comprising a content of less than 2% by weight, in particular less than 1% by weight, preferably less than 0.5% by weight, relative to the total weight of the composition, of liquid lipophilic organic UV-screening agent, and more preferentially being free of liquid lipophilic organic UV-screening agent.

4. The composition as claimed in any one of the preceding claims, said solid lipophilic organic UV-screening agent being present in a content ranging from 5 to 25% by weight, and preferably from 10 to 20% by weight, relative to the total weight of the composition.

5. The composition as claimed in any one of the preceding claims, in which the hydrophobic silica aerogel is a silica aerogel, the surface of which has been modified with trimethyl silyl groups.

6. The composition as claimed in any one of the preceding claims, in which the hydrophobic silica aerogel is present in a content ranging from 5% to 10% by weight, preferably from 5% to 8% by weight, more preferentially from 5% to 7% by weight, relative to the total weight of the composition.

7. The composition as claimed in any one of the preceding claims, in which the amorphous spherical silica is present in a content ranging from 1% to 6% by weight, preferably ranging from 2% to 5% by weight, relative to the total weight of the composition.

8. The composition as claimed in any one of the preceding claims, in which said ester oil is chosen from isopropyl palmitate, isopropyl myristate, isononyl isononanoate, C12-C15 alkyl benzoates, diisopropyl adipate, diisopropyl sebacate, triglycerides of capric and caprylic acids, and mixtures thereof, preferably chosen from isopropyl palmitate, isopropyl myristate, isononyl isononanoate, C12-C15 alkyl benzoates, diisopropyl adipate, diisopropyl sebacate, and mixtures thereof, and more preferentially the composition comprises the mixture of isopropyl palmitate, isopropyl myristate, isononyl isononanoate, C12-C15 alkyl benzoate, diisopropyl adipate, and diisopropyl sebacate.

9. The composition as claimed in any one of the preceding claims, in which the ester oil is present in a content ranging from 40% to 90% by weight, preferably from 50% to 80% by weight, better still from 55% to 75% by weight, relative to the total weight of the composition.

10. The composition as claimed in any one of the preceding claims, in which the semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain is chosen from polystearyl acrylates, polybehenyl acrylates, and mixtures thereof, and preferably from polystearyl acrylates.

11. The composition as claimed in any one of the preceding claims, in which the semicrystalline homopolymer containing at least one C16-C22 alkyl acrylate chain is present in a content ranging from 0.1% to 10% by weight, preferably ranging from 0.2% to 8% by weight, and better still ranging from 0.5% to 6% by weight, relative to the total weight of the composition.

12. The composition as claimed in any one of the preceding claims, comprising a volatile oil, preferably chosen from isododecane and isohexadecane, preferentially isododecane.

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