WO2012110302A2 - Composition containing screening composites and particles of inorganic screening agents, which are hydrophobic-modified with an oil or wax of natural origin - Google Patents

Abstract

The present invention relates to a composition containing, in a cosmetically acceptable medium: a) at least composite particles A with a mean size of between 0.1 and 30 pm, comprising a matrix and an inorganic UV-screening agent, the said inorganic screening agent being present in a content ranging from 1 % to 70% by weight relative to the total weight of the composite particle, b) at least particles B of an inorganic UV-screening agent, which are hydrophobic- treated with at least one oil or wax of natural origin; c) and optionally an oily dispersion of hydrophobic particles C of inorganic UV- screening agent with a mean size of greater than 100 nm; the said particles C being different from the particles B.

Description

COMPOSITION CONTAINING SCREENING COMPOSITES AND PARTICLES OF INORGANIC SCREENING AGENTS, WHICH ARE HYDROPHOBIC- MODIFIED WITH AN OIL OR WAX OF NATURAL ORIGIN The present invention relates to a cosmetic composition containing composite particles A between 0.1 and 30 pm in size comprising a matrix and a screening material, and particles B of inorganic UV-screening agent, which are hydrophobic- treated with at least one oil or wax of natural origin. This composition is for topical use and is more particularly intended for the photoprotection of the skin and/or hair against ultraviolet (UV) radiation.

It is known that light radiation with wavelengths of between 280 nm and 400 nm permits tanning of the human epidermis and that light rays with wavelengths more particularly between 280 and 320 nm, known as UV-B rays, cause skin burns and erythema which can harm the development of a natural tan.

For these reasons, and also for aesthetic reasons, there is constant demand for means for controlling this natural tanning in order thus to control the colour of the skin; this UV-B radiation should thus be screened out.

It is also known that UV-A rays, with wavelengths between 320 and 400 nm, which cause tanning of the skin, are liable to induce adverse changes therein, in particular in the case of sensitive skin or skin that is continually exposed to solar radiation. UV-A rays cause in particular a loss of elasticity of the skin and the appearance of wrinkles leading to premature ageing of the skin.

Thus, for aesthetic and cosmetic reasons, for instance conservation of the skin's natural elasticity, people increasingly wish to control the effect of UV-A rays on their skin. It is thus desirable also to screen out UV-A radiation.

For the purpose of protecting the skin and keratin materials against UV radiation, antisun compositions comprising organic screening agents that are active in the UV-A range and in the UV-B range are generally used. Many cosmetic products exist comprising one or more inorganic and/or organic UV-screening agents. Fine particles of a metal oxide such as titanium oxide (T1O2) are usually used for children's skin or sensitive skin, to protect the skin against UV rays. These fine metal oxide particles generally have a mean elementary particle size of less than or equal to 0.1 pm, preferably between 5 nm and 100 nm, preferably between 0.01 and 0.1 pm, and preferentially between 0.015 and 0.05 pm.

One of the major drawbacks of inorganic screening agents lies in the fact that conventional antisun formulations based on metal oxide pigments result, after application to the skin, in an uneven, inhomogeneous or even coarse distribution of the said pigments on this skin, which may be detrimental to the quality of the overall photoprotective effect desired. This poor distribution of the screening metal oxide pigments that is observed at the surface of the skin is often linked to the fact that there is, in the initial composition itself (before application), a substantial lack of homogeneity (poor dispersion of the pigment in its support). Their screening efficacy still remains insufficient.

Patent applications FR 2882371 , WO 2006/083326 and WO 98/37964 describe various processes for manufacturing composite particles formed from a material comprising nanoparticles of metal oxides, such as titanium dioxide. Application WO 2006/061 835 describes compositions comprising spherical composites based on a metal oxide and on a hydrophobic polymer.

Known in the cosmetic field are application EP 1 388 550, which targets the use of composite particles comprising a core formed of a metal oxide coated with a silicone or fluoro compound and the use thereof as a photoprotective cosmetic composition, and application WO 98/22539, which describes a sunscreen containing a particle of silicon and/or of another solid compound in which the silicon is in stoichiometric excess, the said particle having a mean diameter of less than 0.12 pm and being covered with a layer of oxide having a thickness ranging from 0.001 to 0.3 pm.

Antisun formulations that may contain as screening system spherical particles of composite material with a mean size of between 2 and 7 pm, T1O2 encapsulated in spherical silica particles, are known, such as those sold under the name Eospoly TR by the company Creations Couleurs or under the name Sunsil T50 by Sunjin Chemical. These screening materials have the drawback of leading to formulations whose efficacy still remains insufficient.

Patent application US 2010/0 136 065 discloses antisun formulations that may contain, as screening system, particles of inorganic UV-screening agent, which are hydrophobic-treated with an oil or wax of natural origin. These screening materials have the drawback of leading to formulations whose efficacy still remains insufficient. There is thus still a need for UV sun protection compositions based on inorganic UV-screening agents, which afford efficient photoprotection and which do not have the drawbacks presented above.

Unexpectedly and advantageously, the inventors have shown that this need can be met by means of the compositions according to the present invention.

A first subject of the present invention concerns a cosmetic composition containing, in a cosmetically acceptable medium:

a) at least composite particles A with a mean size of between 0.1 and 30 pm, comprising a matrix and an inorganic UV-screening agent, the said inorganic screening agent being present in a content ranging from 1 % to 70% by weight relative to the total weight of the composite particle, b) at least particles B of an inorganic UV-screening agent, which are hydrophobic- treated with at least one oil or wax of natural origin;

c) and optionally an oily dispersion of hydrophobic particles C of inorganic UV- screening agent with a mean size of greater than 0.1 pm; the said particles C being different from the particles B.

The composition according to the present invention is effective in photoprotection.

The following description and examples present other advantages, aspects and properties of the present invention.

The following description and examples present other advantages, aspects and properties of the present invention. Definitions

The following definitions are used in the present text.

The compositions according to the present invention are photoprotective compositions intended to screen UV radiation; these compositions are also known as anti-sun compositions or sun protection compositions.

The term "cosmetically acceptable" means compatible with the skin and/or its integuments or mucous membranes, having a pleasant colour, odour and feel and not causing any unacceptable discomfort (stinging, tautness or redness) liable to discourage the consumer from using this composition.

The expression "mean size" of the particles is understood to mean the parameter D[4,3] measured using a "Mastersizer 2000" particle size analyser (Malvern). The light intensity scattered by the particles as a function of the angle at which they are lit is converted to size distribution according to Mie theory. The parameter D[4,3] is measured; this is the mean diameter of the sphere having the same volume as the particle. For a spherical particle, reference will often be made to the "mean diameter".

The term "mean elementary size" means the size of non-aggregated particles.

The term "oil" means a compound that is liquid at room temperature. The term "wax" means a compound that is solid or substantially solid at room temperature and whose melting point is generally greater than 35°C.

The term "hydrophobic particles" means particles which, when introduced into an oily phase at 25°C, to a mass concentration equal to 1 %, produce a solution that is macroscopically homogeneous to the naked eye.

SCREENING COMPOSITE PARTICLES A The spherical and non-spherical particles A used according to the present invention comprise a matrix and an inorganic UV-screening agent. The matrix comprises one or more organic and/or inorganic materials. The inorganic UV-screening agent is generally chosen from metal oxides, preferably titanium, zinc or iron oxides or mixtures thereof and more particularly from titanium oxide and zinc oxide, and mixtures thereof. Particularly preferably, the inorganic UV-screening agent is T1O2. These metal oxides may be in the form of particles with a mean size generally of less than 200 nm. Advantageously, the metal oxide particles used have a mean elementary size of less than or equal to 0.1 pm.

These metal oxides may also be in the form of layers, preferably multilayers with a mean thickness generally of less than 0.2 pm.

According to a first variant, the composite particles A contain a matrix comprising an organic and/or inorganic material, in which are included particles of inorganic UV-screening agent. According to this embodiment, the matrix has inclusions, and particles of inorganic UV-screening agent are placed in the inclusions of the matrix.

According to a second variant, the composite particles A contain a matrix made of an organic and/or inorganic material, which matrix is covered with at least one layer of inorganic UV-screening agent which may be connected to the matrix by means of a binder.

According to a third variant, the composite particles A contain an inorganic UV- screening agent covered with at least one layer of an organic and/or inorganic material.

The matrix may also be formed from one or more organic or inorganic materials. It may then be a continuous phase of materials such as an alloy, i.e. a continuous phase in which the materials can no longer be dissociated, or a discontinuous phase of materials, for example constituted of an organic or inorganic material covered with a layer of another different organic or inorganic material.

The mass content of metal oxide in the particles of the invention is between 1 % and 70%, preferably between 2% and 65% and better still between 3% and 60%.

According to one variant, in particular when the composite particles A comprise a matrix covered with a layer of UV-screening agent, the composite particles may furthermore be covered with an additional coating, in particular chosen from biodegradable or biocompatible materials, lipid materials, for instance surfactants or emulsifiers, polymers, and oxides.

The screening composite particles A may be chosen from those of spherical shape, those of non-spherical shape, or mixtures thereof. The term "spherical" is understood to mean that the particle has a sphericity index, i.e. the ratio between its largest diameter and its smallest diameter, of less than 1 .2.

The term "non-spherical" refers to particles in three dimensions (length, width and thickness or height) for which the ratio of the longest dimension to the shortest dimension is greater than 1 .2. The dimensions of the particles of the invention are evaluated by scanning electron microscopy and image analysis. They comprise 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. When the shape is circular, the length and the width are identical and correspond to the diameter of a disc, whereas the height corresponds to the thickness of the disc. When the surface is oval, the length and the width correspond, respectively, to the large axis and the small axis of an ellipse and the height corresponds to the thickness of the elliptic disc formed by the platelet. When it is a parallelepiped, the length and the width may be of identical or different dimensions: when they are of the same dimension, the shape of the surface of the parallelepiped is a square; in the contrary case, the shape is rectangular. As regards the height, it corresponds to the thickness of the parallelepiped.

Preferably, the content of composite particles of the composition according to the invention ranges from 1 % to 70%, preferably from 1 .5% to 45%, preferably from 2% to 20% by weight relative to the total weight of the cosmetic composition.

Spherical screening composite particles A

The inorganic materials that may be used in the matrix of the spherical composite particles according to the present invention may be chosen from the group formed by glass, silica and aluminium oxide, and mixtures thereof.

The organic materials that may be used to form the matrix are chosen from the group formed by poly(meth)acrylates, polyamides, silicones, polyurethanes, polyethylenes, polypropylenes, polystyrenes, polycaprolactams, polysaccharides, polypeptides, polyvinyl derivatives, waxes, polyesters and polyethers, and mixtures thereof.

Preferably, the matrix of the spherical composite particle A contains a material or a mixture of materials chosen from:

- Si0₂,

- polymethyl methacrylate,

- copolymers of styrene and of a C1 /C5 alkyl (meth)acrylate derivative,

- polyamides, such as nylon.

The composite particles A in spherical form are characterized by a mean diameter between 0.1 pm and 30 m, preferably between 0.2 pm and 20 pm and more preferably between 0.3 pm and 10 pm, advantageously between 0.5 pm and 10 pm.

According to a first variant, the spherical composite particles A contain a matrix comprising an organic and/or inorganic material, in which matrix particles of inorganic UV-screening agent are included.

According to this first variant, the particles of inorganic UV-screening agent are characterized by a mean elementary size generally of less than 200 nm. Advantageously, the metal oxide particles used have a mean elementary size of less than or equal to 0.1 pm.

As composite particles A corresponding to this variant, mention may be made of the products Sunsil TIN 50 and Sunsil TIN 40 sold by the company Sunjin Chemical. These spherical composite particles with a mean size between 2 and 7 pm are formed from T1O2 encapsulated in a silica matrix.

Mention may also be made of the following particles A:

- spherical composite particles with a mean size between 4 and 8 pm, containing T1O2 and S 1O2, having the trade name Eospoly TR sold by the company Creations

Couleurs,

- composite particles containing T1O2 and a styrene/alkyl acrylate copolymer matrix sold under the name Eospoly UV TR22 HB 50 by the company Creations Couleurs,

- composite particles containing T1O2 and ZnO and a PMMA matrix, having the trade name Sun PMMA-T50 sold by the company Sunjin Chemical.

According to a second variant, the spherical composite particles A contain a matrix made of an organic and/or inorganic material, covered with at least one layer of inorganic UV-screening agent connected to the matrix by means of a binder.

According to this second variant, the mean thickness of the layer of inorganic UV- screening agent is generally between 0.001 and 0.2 pm and preferably between 0.01 and 0.1 pm.

The spherical composite particles A used according to the invention have a size of between 0.1 and 30 pm, preferably between 0.3 and 20 pm and even more preferentially between 0.5 and 10 pm. Among the composite particles A that may be used according to the invention, mention may also be made of spherical composite particles containing T1O2 and S 1O2, having the trade name STM ACS-0050510, supplied by the company JGC Catalysts and Chemical. According to a third variant, the spherical composite particles A contain an inorganic UV-screening agent covered with at least one layer of an organic and/or inorganic material. According to this third variant, the particles of inorganic UV- screening agent are characterized by a mean elementary size generally of between 0.001 and 0.2 m. Advantageously, the metal oxide particles used have a mean elementary size between 0.01 and 0.1 pm.

The spherical composite particles A used according to the invention have a size of between 0.1 and 30 pm, preferably between 0.3 and 20 pm and even more preferentially between 0.5 and 10 pm.

Non-spherical screening particles A The organic materials that may be used to form the matrix of the non-spherical screening particles A are chosen from the group formed by polyamides, silicones, polysaccharides, polyvinyl derivatives, waxes and polyesters, and mixtures thereof. Among the organic materials that may be used, mention is preferably made of:

- triethoxycaprylylsilane,

- ethylene/vinyl acetate copolymers.

The inorganic materials that may be used in the matrix of the non-spherical composite particles A are chosen from the group formed by mica, synthetic mica, talc, silica, aluminium oxide, boron nitride, kaolin, hydrotalcite, mineral clays and synthetic clays, and mixtures thereof. Preferably, these inorganic materials are chosen from:

- silica,

- talc,

- mica,

- alumina.

The non-spherical composite particles of the invention are characterized by three dimensions, namely:

- the smallest is greater than 0.1 pm, preferably greater than 0.3 pm and better still greater than 0.5 pm,

- the largest is less than 30 pm, preferably 20 pm and better still 10 pm. The ratio of the largest to the smallest dimension is greater than 1 .2.

The dimensions of the particles A of the invention are evaluated by scanning electron microscopy and image analysis. The non-spherical screening composite particles A that may be used according to the invention will preferably be platelet-shaped.

The term "platelet-shaped" means parallelepipedal-shaped. They may be smooth, rough or porous. The platelet-shaped composite particles A preferably have a mean thickness of between 0.1 and 10 pm, the mean length is generally between 0.5 and 30 pm and the mean width is between 0.5 and 30 pm. The thickness is the smallest of the dimensions, the width is the medium dimension, and the length is the longest of the dimensions.

According to a first variant, the composite particles A contain a matrix comprising an organic and/or inorganic material, in which are included particles of inorganic UV-screening agent.

According to this first variant, the particles of inorganic UV-screening agent are characterized by a mean elementary size generally of less than 0.2 pm. Advantageously, the metal oxide particles used have a mean elementary size of less than or equal to 0.1 pm.

According to a second variant, the composite particles A contain a matrix made of an organic and/or inorganic material, covered with at least one layer of inorganic UV-screening agent connected to the matrix by means of a binder.

According to this second variant, the mean thickness of the layer of inorganic UV- screening agent is generally about ten nanometres. The mean thickness of the layer of inorganic UV-screening agent is advantageously between 0.001 and 0.2 pm and preferably between 0.01 and 0.2 pm.

According to a third variant, the non-spherical composite particles A contain an inorganic UV-screening agent covered with at least one layer of an organic and/or inorganic material. According to this third variant, the particles of inorganic UV- screening agent are characterized by a mean elementary size generally of between 0.001 and 0.2 pm. Advantageously, the metal oxide particles used have a mean elementary size between 0.01 and 0.1 pm.

The non-spherical composite particles A used according to the invention have a size of between 0.1 and 30 pm and preferably between 0.5 and 10 pm.

Preferably, the inorganic UV-screening agent used in the composite particle A is chosen from metal oxides, in particular from titanium, zinc or iron oxides and more particularly titanium dioxide (T1O2). Preferably, the matrix of the composite particle A contains a material or a mixture of materials chosen from:

- Si0₂,

- alumina,

- mica,

- an alumina/triethoxycaprylylsilane mixture,

- talc,

- Nylon. More preferably, the matrix of the composite particle A is formed from a material or a mixture of materials chosen from:

- alumina,

- an alumina/triethoxycaprylylsilane mixture,

- talc,

- silica,

- mica.

Among the composite particles A that may be used according to the invention, mention may also be made of the following particles:

- composite particles containing ΤΊΟ2 and an alumina matrix, of trade name Matlake OPA sold by the company Sensient LCW,

- composite particles containing ΤΊΟ2 and an alumina/triethoxycaprylylsilane matrix, of trade name Matlake OPA AS sold by the company Sensient LCW,

- composite particles containing ultrafine ΤΊΟ2 particles deposited on the surface of talc platelets, of trade name TTC 30 sold by the company Miyoshi Kasei,

- composite particles containing ultrafine ΤΊΟ2 particles deposited on the surface of talc platelets, of trade name Silseem Mistypearl Yellow sold by the company Nihon Koken Kogyo (NKK).

Platelet-shaped composite particles A will preferentially be used.

PARTICLES B OF INORGANIC UV-SCREENING AGENT THAT ARE HYDROPHOBIC-TREATED WITH A NATURAL OIL OR WAX The inorganic UV-screening agent constituting these particles B is generally chosen from metal oxides, preferably titanium, zinc or iron oxides or mixtures thereof and more particularly from titanium dioxide and zinc oxide, and mixtures thereof. Particularly preferably, the inorganic UV-screening agent is T1O2. These metal oxides may be in the form of particles with a mean size generally of less than 200 nm. Advantageously, the metal oxide particles used have a mean elementary size of less than or equal to 100 nm.

These metal oxides may also be in the form of layers, preferably multilayers with a mean thickness generally of less than 200 nm.

The oil of natural origin used for treating the said particles B so as to make them hydrophobic is preferably chosen from jojoba esters, which are generally a complex mixture of esters produced by transesterification/interesterification of jojoba (Simmondsia chinensis) oil or of esters of hydrogenated jojoba oil, or mixtures thereof. The wax of natural origin used for treating the said particles B so as to make them hydrophobic is preferably a jojoba wax, which is the final product of the controlled hydrogenation of jojoba oil. Furthermore, jojoba esters are known to be resistant to oxidation.

Jojoba esters such as the commercial product sold under the name Floraester 70 by the company Floratee will be used more particularly as hydrophobic-treatment agent.

The particles B of inorganic UV-screening agent that are hydrophobic-treated with an oil or wax of natural origin are described and synthesized in patent application US 2010/0 136 065. Use will be made more particularly of titanium dioxide particles B treated with alumina and with jojoba esters, of INCI name Titanium dioxide (and) alumina (and) jojoba esters, for instance the products sold under the name MPT-154-NJE8 or TTO-NJE8 by the company Kobo. Preferably, the content of particles B in the composition according to the invention is between 0.1 % and 20%, preferably between 0.5% and 10% and even more preferentially between 0.5% and 10% by weight relative to the total weight of the composition. OILY DISPERSION OF HYDROPHOBIC-MODIFIED PARTICLES C OF INORGANIC UV-SCREENING AGENT

According to one particularly preferred form of the invention, the Applicant has found, surprisingly, that the screening efficacy obtained with the combination of screening particles A and B as described previously can be improved by additionally using a third category C of screening particles in the form of an oily dispersion of hydrophobic-modified particles C of inorganic UV-screening agent, with a mean size of greater than 100 nm. The inorganic UV-screening agent constituting these particles C is generally chosen from metal oxides, preferably titanium, zinc or iron oxides or mixtures thereof and more particularly from titanium dioxide and zinc oxide, and mixtures thereof. Particularly preferably, the inorganic UV-screening agent is T1O2. The particles C of inorganic UV-screening agent, in particular of metal oxide, preferably have a mean elementary size generally of between 100 nm and 200 nm.

The hydrophobic-modified particles C of inorganic UV-screening agent may be coated by undergoing one or more surface treatments of chemical, electronic, mechanochemical and/or mechanical nature with compounds as described, for example, in Cosmetics & Toiletries, February 1990, Vol. 105, pp. 53-64, such as amino acids, beeswax, fatty acids, fatty alcohols, anionic surfactants, lecithins, sodium, potassium, zinc, iron or aluminium salts of fatty acids, metal alkoxides (titanium or aluminium alkoxides), polyethylene, silicones, proteins (collagen, elastin), alkanolamines, silicon oxides, metal oxides or sodium hexametaphosphate.

As is known, silicones are organosilicon polymers or oligomers of linear or cyclic, branched or crosslinked structure, of variable molecular weight, obtained by polymerization and/or polycondensation of suitably functionalized silanes, and consist essentially of a repetition of main units in which the silicon atoms are linked together via oxygen atoms (siloxane bond), optionally substituted hydrocarbon-based radicals being directly attached via a carbon atom to the said silicon atoms. The term "silicones" also includes the silanes required for their preparation, in particular alkylsilanes. Inorganic screening agents, in particular metal oxide particles coated with at least one linear or branched C12-C18 fatty acid and more particularly stearic acid, will preferably be used.

The hydrophobic-modified particles C of inorganic screening agent, in particular of metal oxide, may also be treated with other surface agents, in particular with cerium oxide, alumina, silica, aluminium compounds or silicon compounds, or mixtures thereof.

The oil present in the oily dispersion of particles of inorganic UV-screening agent is preferably chosen from C12-C-1 5 alkyl benzoates and triglycerides such as caprylic/capric triglyceride.

The oily dispersions of hydrophobic-modified particles C of inorganic UV-screening agent may also comprise at least one dispersant, for instance polyhydroxystearic acid.

Use will be made more particularly of the following oily dispersions of T1O2 particles treated with a mixture of stearic acid, polyhydroxystearic acid and alumina:

- titanium dioxide (and) C12-C15 alkyl benzoate (and) polyhydroxystearic acid (and) stearic acid (and) alumina, for instance the product sold under the trade name Solveil XT-100 by the company Croda;

- titanium dioxide (and) caprylic/capric triglyceride (and) polyhydroxystearic acid (and) stearic acid (and) alumina, for instance the product sold under the trade name Solveil XT-300 by the company Croda.

Preferably, the content of oily dispersion of particles C of inorganic UV-screening agent in the composition according to the invention is between 0.1 % and 30%, preferably between 0.5% and 20% and even more preferentially between 1 % and 10% by weight relative to the total weight of the composition.

POLAR OILS According to one particularly preferred form of the invention, the compositions may contain at least one anhydrous phase comprising at least one polar oil.

The term "anhydrous phase" means any support comprising less than 3% by weight of water, or even less than 1 % by weight of water, or even more particularly less than 0.5% by weight of water relative to the total weight of the composition, or even is free of water.

The term "polar oil" means any lipophilic compound having, at 25°C, a solubility parameter 5_d characteristic of dispersive interactions of greater than 16 and a solubility parameter δ_ρ characteristic of polar interactions of strictly greater than 0. The solubility parameters 5_d and δ_ρ are defined according to the Hansen classification. For example, these polar oils may be chosen from esters, triglycerides and ethers.

The definition and calculation of the solubility parameters in the Hansen three- dimensional solubility space are described in the article by CM. Hansen: "The three dimensional solubility parameters", J. Paint Technol. 39, 105 (1967). According to this Hansen space:

- 5D characterizes the London dispersion forces derived from the formation of dipoles induced during molecular impacts;

- δ_ρ characterizes the Debye interaction forces between permanent dipoles and also the Keesom interaction forces between induced dipoles and permanent dipoles;

- 5h characterizes the specific interaction forces (such as hydrogen bonding, acid/base, donor/acceptor, etc.); and

- 5a is determined by the equation: 5_a = (δ_ρ ² + 5h²)^½.

The parameters δ_ρ, 5h, 5p and 5_a are expressed in (J/cm³)^½

The polar oil may be a volatile or non-volatile hydrocarbon-based, silicone and/or fluoro oil.

These oils may be of plant, mineral or synthetic origin.

The term "polar hydrocarbon-based oil" means an oil formed essentially from, or even constituted by, carbon and hydrogen atoms, and optionally oxygen and nitrogen atoms, and not containing any silicon or fluorine atoms. It may contain alcohol, ester, ether, carboxylic acid, amine and/or amide groups.

The term "silicone oil" means an oil containing at least one silicon atom, and especially containing Si-0 groups.

The term "fluoro oil" means an oil containing at least one fluorine atom.

The term "fluoro oil" means an oil containing at least one fluorine atom. Preferentially, the polar oil according to the invention has a surface tension of greater than 10 mN/m at 25°C and at atmospheric pressure.

The surface activity is measured by static tensiometry using the Du Nouy ring.

The principle of the measurement is as follows (measurement carried out at 25°C, at atmospheric pressure):

The weight of the ring is neutralized by a tare. The ring is completely immersed in the liquid to be evaluated, then withdrawn very slowly until the force reaches its maximum. From this maximum force F_max, the surface tension is calculated according to the equation:

»J ^— " max / 4nR f_Corr (r, R,p)

with fcorn correction factor of the ring depending on the geometry of the ring and the density p.

The parameters r and R respectively denote the internal and external radii of the ring.

According to a first embodiment, the polar oil may be a non-volatile oil. In particular, the non-volatile polar oil may be chosen from the list of oils below, and mixtures thereof:

- hydrocarbon-based polar oils such as phytostearyl esters, such as phytostearyl oleate, phytostearyl isostearate and lauroyl/octyldodecyl/phytostearyl glutamate (Ajinomoto, Eldew PS203), triglycerides consisting of fatty acid esters of glycerol, in particular the fatty acids of which may have chain lengths ranging from C₄ to C36, and especially from C18 to C36, these oils possibly being linear or branched, and saturated or unsaturated; these oils may especially be heptanoic or octanoic triglycerides, wheatgerm oil, sunflower oil, grapeseed oil, sesame seed oil (820.6 g/mol), corn oil, apricot oil, castor oil, shea oil, avocado oil, olive oil, soybean oil, sweet almond oil, palm oil, rapeseed oil, cottonseed oil, hazelnut oil, macadamia oil, jojoba oil, alfalfa oil, poppy oil, pumpkin oil, marrow oil, blackcurrant oil, evening primrose oil, millet oil, barley oil, quinoa oil, rye oil, safflower oil, candlenut oil, passionflower oil or musk rose oil; shea butter; or alternatively caprylic/capric acid triglycerides, for instance those sold by the company Stearineries Dubois or those sold under the names Miglyol 810^®, 812^® and 818^® by the company Dynamit Nobel;

- synthetic ethers containing from 10 to 40 carbon atoms, such as dicaprylyl ether; - hydrocarbon-based esters of formula RCOOR' in which RCOO represents a carboxylic acid residue comprising from 2 to 40 carbon atoms, and R' represents a hydrocarbon-based chain containing from 1 to 40 carbon atoms, such as cetostearyl octanoate, isopropyl alcohol esters, such as isopropyl myristate or isopropyl palmitate, ethyl palmitate, 2-ethylhexyl palmitate, isopropyl stearate or isostearate, isostearyl isostearate, octyl stearate, diisopropyl adipate, heptanoates, and especially isostearyl heptanoate, alcohol or polyalcohol octanoates, decanoates or ricinoleates, for instance propylene glycol dioctanoate, cetyl octanoate, trioleoyl octanoate, 2-ethylhexyl 4-diheptanoate and palmitate, alkyl benzoate, polyethylene glycol diheptanoate, propylene glycol 2-diethyl hexanoate, and mixtures thereof, C12 to C15 alcohol benzoates, hexyl laurate, neopentanoic acid esters, for instance isodecyl neopentanoate, isotridecyl neopentanoate, isostearyl neopentanoate and 2-octyldodecyl neopentanoate, isononanoic acid esters, for instance isononyl isononanoate, isotridecyl isononanoate and octyl isononanoate, oleyl erucate, isopropyl lauroyl sarcosinate, diisopropyl sebacate, isocetyl stearate, isodecyl neopentanoate, isostearyl behenate, and myristyl myristate;

- polyesters obtained by condensation of an unsaturated fatty acid dimer and/or trimer and of diol, such as those described in patent application FR 0 853 634, in particular such as dilinoleic acid and 1 ,4-butanediol. Mention may especially be made in this respect of the polymer sold by Biosynthis under the name Viscoplast 14436H (INCI name: dilinoleic acid/butanediol copolymer), or else copolymers of polyols and of dimer diacids, and esters thereof, such as Hailuscent ISDA;

- polyol esters and pentaerythritol esters, for instance dipentaerythrityl tetrahydroxystearate/tetraisostearate;

- fatty alcohols containing from 12 to 26 carbon atoms, for instance octyldodecanol, 2-butyloctanol, 2-hexyldecanol, 2-undecylpentadecanol and oleyl alcohol;

- C12-C22 higher fatty acids, such as oleic acid, linoleic acid and linolenic acid, and mixtures thereof;

- fluorinated oils which are optionally partially hydrocarbon-based and/or silicone- based;

- fatty acids containing from 12 to 26 carbon atoms, for instance oleic acid;

- dialkyl carbonates, the two alkyl chains possibly being identical or different, such as dicaprylyl carbonate sold under the name Cetiol CC by Cognis; and

- non-volatile oils of high molecular mass, for example between 400 and 10 000 g/mol, in particular between 650 and 10 000 g/mol, for instance:

i) vinylpyrrolidone copolymers such as the vinylpyrrolidone/1 - hexadecene copolymer, Antaron V-216 sold or manufactured by the company ISP (MW = 7300 g/mol),

ii) esters such as:

a) linear fatty acid esters with a total carbon number ranging from 35 to 70, for instance pentaerythrityl tetrapelargonate (MW = 697.05 g/mol), b) hydroxylated esters such as polyglycerol-2 triisostearate (MW = 965.58 g/mol),

c) aromatic esters such as tridecyl trimellitate (MW = 757.19 g/mol), C12-C15 alcohol benzoate, 2-phenylethyl benzoate and butyloctyl salicylate, d) esters of C24-C28 branched fatty acids or fatty alcohols such as those described in patent application EP-A-0 955 039, and especially triisoarachidyl citrate (MW = 1033.76 g/mol), pentaerythrityl tetraisononanoate (MW = 697.05 g/mol), glyceryl triisostearate (MW = 891 .51 g/mol), glyceryl tris(2- decyl)tetradecanoate (MW = 1 143.98 g/mol), pentaerythrityl tetraisostearate (MW = 1202.02 g/mol), polyglyceryl-2 tetraisostearate (MW = 1232.04 g/mol) or else pentaerythrityl tetrakis(2-decyl)tetradecanoate (MW = 1538.66 g/mol),

e) esters and polyesters of dimer diol and of monocarboxylic or dicarboxylic acid, such as esters of dimer diol and of fatty acid and esters of dimer diol and of dimer dicarboxylic acid, such as Lusplan DD-DA5 and Lusplan DD- DA7^® sold by the company Nippon Fine Chemical and described in patent application US 2004-175 338, the content of which is incorporated into the present application by reference,

- and mixtures thereof.

Preferably the polar oil is chosen from C12-C15 alcohol benzoate, diisopropyl sebacate, isopropyl lauroyl sarcosinate, dicaprylyl carbonate, 2-phenylethyl benzoate, butyloctyl salicylate, 2-octyldodecyl neopentanoate, dicaprylyl ether, isocetyl stearate, isodecyl neopentanoate, isononyl isononate, isopropyl myristate, isopropyl palmitate, isostearyl behenate, myristyl myristate, octyl palmitate and tridecyl trimellitate.

Preferably, the polar oil is a C12-C15 alkyl benzoate.

The mass content of polar oil relative to the total weight of the composition is between 10% and 100% and preferably between 15% and 90%.

The "fatty phase" of the compositions according to the invention may also comprise a wax, an apolar oil or mixtures thereof.

The apolar oils and the waxes conventionally used in cosmetic compositions may be used in the compositions according to the present invention. The compositions according to the invention may also comprise additional cosmetic and/or dermatological active agents.

A person skilled in the art will select the said active agent(s) as a function of the effect desired on the skin, the hair, the eyelashes, the eyebrows and the nails.

Advantageously, the composition according to the invention also comprises at least one organic UV-screening agent.

Included among the organic UV-screening agents are in particular the following hydrophobic or hydrophilic UV-screening agents.

The term "hydrophobic screening agent" means:

- any screening agent that is lipophilic, i.e. which can be fully dissolved in molecular state in a liquid fatty phase or which can be dissolved in colloidal form (for example in micellar form) in a liquid fatty phase;

- any screening agent that is insoluble both in a liquid fatty phase and in a liquid aqueous phase.

The term "hydrophilic screening agent" means any screening agent that can be fully dissolved in molecular state in a liquid aqueous phase or that can be dissolved in colloidal form (for example in micellar form) in a liquid aqueous phase.

Hydrophobic UV-A screening agents Dibenzoylmethane derivatives:

Butylmethoxydibenzoylmethane sold in particular under the trade name Parsol 1789 by DSM Nutritional Products, Inc.;

Isopropyldibenzoylmethane.

Aminobenzophenones:

n-Hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate sold in particular under the trade name Uvinul A+ by BASF;

1 , 1 '-(1 ,4-Piperazinediyl)bis[1 -[2-[4-(diethylamino)-2- hydroxybenzoyl]phenyl]methanone (CAS 919803-06-8).

Anthranilic derivatives:

Menthyl anthranilate sold in particular under the trade name Neo Heliopan MA by Symrise.

4,4-Diarylbutadiene derivatives:

1 , 1 -Dicarboxy-(2,2'-dimethylpropyl)-4,4-diphenylbutadiene. Merocvanin derivatives:

- Octyl 5-N,N-diethylamino-2-phenylsulfonyl-2,4-pentadienoate.

In the context of the invention, and according to one particular embodiment, the following hydrophobic screening agents A are used:

Butylmethoxydibenzoylmethane; and/or

n-Hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate.

Hydrophilic UV-A screening agents - Terephthalylidenedicamphorsulfonic acid manufactured under the name Mexoryl SX by Chimex,

- Bis-benzazolyl derivatives as described in patents EP 669 323, and US 2 463 264 and more particularly the compound disodium phenyldibenzimidazotetrasulfonate sold under the trade name Neo Heliopan AP by Symrise.

The preferred water-soluble UVA-screening agent is terephthalylidenedicamphorsulfonic acid.

Hydrophobic UV-B screening agents para-Am inobenzoates:

- Ethyl PABA;

- Ethyl dihydroxypropyl PABA;

- Ethylhexyl dimethyl PABA (Escalol 507 from ISP).

Salicylic derivatives: Homosalate sold in particular under the name Eusolex HMS by Rona/EM Industries;

Ethylhexyl salicylate sold in particular under the name Neo Heliopan OS by Symrise;

Dipropylene glycol salicylate sold in particular under the name Dipsal by Scher; TEA salicylate sold under the name Neo Heliopan TS by Symrise.

Cinnamates

Ethylhexyl methoxycinnamate sold in particular under the trade name Parsol MCX by DSM Nutritional Products, Inc. ;

Isopropyl methoxycinnamate;

Isoamyl methoxycinnamate sold in particular under the trade name Neo Heliopan E 1000 by Symrise;

Diisopropyl methylcinnamate;

Cinnoxate;

Glyceryl ethylhexanoate dimethoxycinnamate. β, β'-Diphenylacrylate derivatives:

Octocrylene sold in particular under the trade name Uvinul N539 by BASF;

Etocrylene sold in particular under the trade name Uvinul N35 by BASF.

Benzylidenecamphor derivatives:

3-Benzylidenecamphor manufactured under the name Mexoryl SD by Chimex; Methylbenzylidenecamphor sold in particular under the name Eusolex 6300 by Merck;

Polyacrylamidomethylbenzylidenecamphor manufactured under the name Mexoryl SW by Chimex.

Triazine derivatives:

Ethylhexyl triazone sold in particular under the trade name Uvinul T150 by BASF; Diethylhexylbutamidotriazone sold under the trade name Uvasorb HEB by Sigma 3V;

2,4,6-Tris(dineopentyl 4'-aminobenzalmalonate)-s-triazine;

2,4,6-Tris(diisobutyl 4'-aminobenzalmalonate)-s-triazine;

2,4-Bis(dineopentyl 4'-aminobenzalmalonate)-6-(n-butyl 4'-aminobenzoate)-s- triazine;

2,4-Bis(n-butyl 4'-aminobenzoate)-6-(aminopropyltrisiloxane)-s-triazine;

the symmetrical triazine screening agents described in patent US 6 225 467, patent application WO 2004/085 412 (see compounds 6 and 9) or the document Symmetrical Triazine Derivatives IP.COM Journal, IP.COM INC West Henrietta, NY, US (20 September 2004), especially 2,4,6-tris(biphenyl)-1 ,3,5-triazines (in particular 2,4,6-tris(biphenyl-4-yl-1 ,3,5-triazine) and 2,4,6-tris(terphenyl)-1 ,3,5- triazine, the latter two screening agents being described in Beiersdorf patent applications WO 06/035 000, WO 06/034 982, WO 06/034 991 , WO 06/035 007, WO 2006/034 992 and WO 2006/034 985).

Imidazoline derivatives:

Ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate. Benzalmalonate derivatives:

Polyorganosiloxanes containing benzalmalonate functions, for instance Polysilicone-15, sold in particular under the trade name Parsol SLX by DSM Nutritional Products, Inc.;

Dineopentyl 4'-methoxybenzalmalonate.

Within the context of the invention, and according to one particular embodiment, the following hydrophobic UV-B screening agents are used in the composition of the invention:

Ethylhexyl salicylate;

Octocrylene;

Ethylhexyl triazone. Hydrophilic UV-B screening agents

The following p-aminobenzoic acid (PABA) derivatives:

PABA,

Glyceryl PABA and

PEG-25 PABA sold in particular under the trade name Uvinul P25 by BASF.

Phenylbenzimidazolesulfonic acid sold in particular under the trade name Eusolex

232 by Merck,

ferulic acid,

salicylic acid,

DEA methoxycinnamate,

benzylidenecamphorsulfonic acid manufactured under the name Mexoryl SL by

Chimex,

camphorbenzalkonium methosulfate manufactured under the name Mexoryl SO by Chimex.

The preferred hydrophilic UVB screening agent is phenylbenzimidazolesulfonic acid.

Mixed UVA and UVB hydrophobic screening agents

Benzophenone derivatives:

Benzophenone-1 sold in particular under the trade name Uvinul 400 by BASF; Benzophenone-2 sold in particular under the trade name Uvinul D50 by BASF; Benzophenone-3 or oxybenzone sold in particular under the trade name Uvinul M40 by BASF;

Benzophenone-6 sold in particular under the trade name Helisorb 1 1 by Norquay; Benzophenone-8 sold in particular under the trade name Spectra-Sorb UV-24 by American Cyanamid;

Benzophenone-10;

Benzophenone-1 1 ;

Benzophenone-12.

Phenylbenzotriazole derivatives: - Drometrizole trisiloxane sold in particular under the name Silatrizole by Rhodia Chimie or manufactured under the name Meroxyl XL by the company Chimex;

- Methylenebis(benzotriazolyl)tetramethylbutylphenol sold in solid form in particular under the trade name Mixxim BB/100 by Fairmount Chemical, or in micronized form as an aqueous dispersion in particular under the trade name Tinosorb M by Ciba Specialty Chemicals.

Bis-resorcinyl triazine derivatives:

Bis(ethylhexyloxyphenol)methoxyphenyl triazine sold in particular under the trade name Tinosorb S by Ciba-Geigy.

Benzoxazole derivatives:

2,4-Bis[5-(1 -dimethylpropyl)benzoxazol-2-yl-(4-phenyl)imino]-6-(2- ethylhexyl)imino-1 ,3,5-triazine, sold in particular under the name Uvasorb K2A by Sigma 3V.

The preferred UVA and UVB hydrophobic organic screening agents are chosen from:

Drometrizole trisiloxane;

- Methylenebis(benzotriazolyl)tetramethylbutylphenol;

Bis(ethylhexyloxyphenol)methoxyphenyltriazine.

Mixed UVA and UVB hvdrophilic screening agents Benzophenone derivatives comprising at least one sulfonic radical, such as

Benzophenone-4 sold in particular under the trade name Uvinul MS 40 by BASF,

Benzophenone-5 and

Benzophenone-9. The organic screening agents, when they are present, are present in contents ranging from 0.01 % to 30% by weight and preferably from 0.1 % to 20% by weight relative to the total weight of the composition of the invention.

ADDITIVES

The compositions in accordance with the present invention may also comprise standard cosmetic adjuvants chosen especially from organic solvents, ionic or nonionic, hydrophilic or lipophilic thickeners, softeners, humectants, opacifiers, stabilizers, emollients, silicones, antifoams, fragrances, preserving agents, anionic, cationic, nonionic, zwitterionic or amphoteric surfactants, fillers, polymers, propellants, basifying or acidifying agents or any other ingredient commonly used in the cosmetic and/or dermatological field.

Among the organic solvents that may be mentioned are lower alcohols and polyols. These polyols may be chosen from glycols and glycol ethers, for instance ethylene glycol, propylene glycol, butylene glycol, dipropylene glycol or diethylene glycol. Hydrophilic thickeners that may be mentioned include carboxyvinyl polymers, such as Carbopols (Carbomers) and the Pemulens (acrylate/C10-C30 alkyl acrylate copolymer); polyacrylamides, for instance the crosslinked copolymers sold under the names Sepigel 305 (CTFA name: polyacrylamide/C13-C14 isoparaffin/Laureth 7) or Simulgel 600 (CTFA name: acrylamide/sodium acryloyldimethyl taurate copolymer/isohexadecane/polysorbate 80) by the company SEPPIC; 2- acrylamido-2-methylpropanesulfonic acid polymers and copolymers, optionally crosslinked and/or neutralized, for instance poly(2-acrylamido-2- methylpropanesulfonic acid) sold by the company Clariant under the trade name Hostacerin AMPS (CTFA name: ammonium polyacryloyldimethyl taurate) or Simulgel 800 sold by the company SEPPIC (CTFA name: sodium polyacryloyldimethyl taurate/polysorbate 80/sorbitan oleate); copolymers of 2- acrylamido-2-methylpropanesulfonic acid and of hydroxyethyl acrylate, for instance Simulgel NS and Sepinov EMT 10 sold by the company SEPPIC; cellulose derivatives such as hydroxyethyl cellulose; polysaccharides and especially gums such as xanthan gum; and mixtures thereof.

Lipophilic thickeners that may be mentioned include synthetic polymers such as poly(Cio-C3o alkyl acrylates) sold under the name Intelimer IPA 13-1 and Intelimer IPA 13-6 by the company Landec, or modified clays such as hectorite and its derivatives, for instance the products sold under the name Bentone.

The compositions according to the invention may also comprise additional cosmetic or dermatological active agents.

Mention may be made, among active agents, of:

- vitamins (A, C, E, K, PP, and the like) and their derivatives or precursors, alone or as mixtures;

- antioxidants;

- free-radical scavengers;

- antiglycation agents;

- calmatives;

- NO-synthase inhibitors;

- agents for stimulating the synthesis of dermal or epidermal macromolecules and/or for preventing their degradation;

- agents for stimulating fibroblast proliferation;

- agents for stimulating keratinocyte proliferation;

- muscle relaxants;

- tensioning agents;

- matting agents;

- keratolytic agents;

- desquamating agents;

- moisturizers, for instance polyols such as glycerol, butylene glycol or propylene glycol;

- antiinflammatory agents;

- agents that act on the energy metabolism of cells;

- insect repellents;

- substance P or substance CRGP antagonists; - hair-loss counteractants and/or hair restorers;

- anti-wrinkle agents.

Needless to say, a person skilled in the art will take care to select the optional additional compound(s) mentioned above and/or the amounts thereof such that the advantageous properties intrinsically associated with the compositions in accordance with the invention are not, or are not substantially, adversely affected by the envisaged addition(s). A person skilled in the art will select the said active agent(s) as a function of the effect desired on the skin, the hair, the eyelashes, the eyebrows and the nails.

Galenical forms The compositions according to the invention may be prepared according to the techniques that are well known to those skilled in the art.

They may be anhydrous and in particular may be in the form of anhydrous oil, cream or gel.

The term "anhydrous composition" means any composition comprising less than 3% by weight of water, or even less than 1 % by weight of water, or even more particularly less than 0.5% by weight of water relative to the total weight of the composition, or even is free of water.

They may comprise an aqueous phase and a fatty phase and may be in the form of a simple or complex emulsion (O/W, W/O, O/W/O or W/O/W) such as a milk, a cream or a cream gel. They may optionally be packaged as an aerosol and may be in the form of a spray.

The compositions according to the invention are preferably in the form of an oil-in- water or water-in-oil emulsion.

The emulsification processes that may be used are of paddle or impeller, rotor- stator and high-pressure homogenizer (HPH) type.

To obtain stable emulsions with a low content of emulsifying compounds (oil/emulsifier ratio > 25), it is possible to make the dispersion in concentrated phase and then to dilute the dispersion with the rest of the aqueous phase.

It is also possible, via HPH (between 50 and 800 bar), to obtain stable dispersions with drop sizes that may be as small as 100 nm.

The emulsions generally contain at least one emulsifier chosen from amphoteric, anionic, cationic or nonionic emulsifiers, used alone or as a mixture. The emulsifiers are appropriately chosen according to the emulsion to be obtained (W/O or O/W). The emulsions may also contain stabilizers of other types, for instance fillers, or gelling or thickening polymers. For the O/W emulsions, examples of emulsifiers that may be mentioned include nonionic emulsifiers such as oxyalkylenated (more particularly polyoxyethylenated) esters of fatty acids and of glycerol; oxyalkylenated esters of fatty acids and of sorbitan; oxyalkylenated (oxyethylenated and/or oxypropylenated) esters of fatty acids, such as the PEG 100 stearate/glyceryl stearate mixture sold, for example, by ICI under the name Arlacel 165; oxyalkylenated (oxyethylenated and/or oxypropylenated) ethers of fatty alcohols; esters of sugars, such as sucrose stearate; or ethers of fatty alcohol and of sugar, in particular alkyl polyglucosides (APGs), such as decyl glucoside and lauryl glucoside, sold, for example, by the company Henkel under the respective names Plantaren 2000 and Plantaren 1200, cetostearyl glucoside, optionally as a mixture with cetostearyl alcohol, sold, for example, under the name Montanov 68 by the company SEPPIC, under the name Tegocare CG90 by the company Goldschmidt and under the name Emulgade KE3302 by the company Henkel, and also arachidyl glucoside, for example in the form of a mixture of arachidyl alcohol, behenyl alcohol and arachidyl glucoside, sold under the name Montanov 202 by the company SEPPIC. According to one particular embodiment of the invention, the mixture of the alkyl polyglucoside as defined above with the corresponding fatty alcohol can be in the form of a self- emulsifying composition, for example as described in document WO-A-92/06778.

Among the other emulsion stabilizers, use may also be made of isophthalic acid or sulfoisophthalic acid polymers, and in particular phthalate/sulfoisophthalate/glycol copolymers, for example the diethylene glycol/phthalate/isophthalate/1 ,4- cyclohexanedimethanol copolymer (INCI name: Polyester-5) sold under the name Eastman AQ Polymer (AQ35S, AQ38S, AQ55S and AQ48 Ultra) by the company Eastman Chemical.

Among the other emulsion stabilizers, mention may also be made of hydrophobic- modified 2-acrylamido-2-methylpropanesulfonic acid polymers such as those described in patent application EP 1 069 142.

When it is an emulsion, the aqueous phase of this emulsion may comprise a nonionic vesicular dispersion prepared according to known processes (Bangham, Standish and Watkins, J. Mol. Biol. 13, 238 (1965), FR 2 315 991 and FR 2 416 008).

As emulsifying surfactants that may be used for the preparation of the W/O emulsions, examples that may be mentioned include emulsifying surfactants with an HLB of less than or equal to 5 at 25°C.

The term HLB is well known to those skilled in the art, and denotes the hydrophilic- lipophilic balance of a surfactant. The HLB of the surfactant(s) used according to the invention is the HLB according to Griffin, defined in the publication J. Soc. Cosm. Chem. 1954 (volume 5), pages 249-256. Non-limiting examples of surfactants with an HLB of less than or equal to 5 are especially given in the publication entitled McCutcheon's Emulsifiers & Detergents, 1998 International Edition, MC Publishing Company, in the chapter entitled HLB Index.

Examples of W/O emulsifying surfactants that may be mentioned include alkyl esters or ethers of sorbitan, of glycerol, of polyol or of sugars; silicone surfactants, for instance dimethicone copolyols, such as the mixture of cyclomethicone and of dimethicone copolyol, sold under the name DC 5225 C by the company Dow Corning, and alkyldimethicone copolyols such as laurylmethicone copolyol sold under the name Dow Corning 5200 Formulation Aid by the company Dow Corning; cetyldimethicone copolyol, such as the product sold under the name Abil EM 90R by the company Goldschmidt, and the mixture of cetyldimethicone copolyol, of polyglyceryl isostearate (4 mol) and of hexyl laurate, sold under the name Abil WE 09 by the company Goldschmidt. One or more coemulsifiers may also be added thereto, which may be chosen advantageously from the group comprising polyol alkyl esters.

Non-silicone emulsifiers, especially alkyl esters or ethers of sorbitan, of glycerol, of polyol or of sugars, will be preferred.

Polyol alkyl esters that may especially be mentioned include polyethylene glycol esters, for instance PEG-30 dipolyhydroxystearate, such as the product sold under the name Arlacel P135 by the company ICI.

Glycerol and/or sorbitan esters that may be mentioned include, for example, polyglyceryl isostearate, such as the product sold under the name Isolan Gl 34 by the company Goldschmidt, sorbitan isostearate, such as the product sold under the name Arlacel 987 by the company ICI, sorbitan glyceryl isostearate, such as the product sold under the name Arlacel 986 by the company ICI, and mixtures thereof.

According to one particularly preferred form of the invention, the compositions are in the form of a water-in-oil emulsion.

As W/O emulsifiers, use will be made more particularly of polyglycerolated diesters and polyesters especially chosen from:

- Polyglyceryl-3 polyricinoleate (Akoline PGPR sold by the company AarhusKarlshamn AB),

- Polyglyceryl-4 polyricinoleate (Sunsoft 818DG from the company Taiyo Kagaku Company, Ltd),

- Polyglyceryl-5 polyricinoleate (Sunsoft AZ-18 from the company Taiyo Kagaku Company, Ltd),

- Polyglyceryl-6 polyricinoleate (Nikkol Hexaglyn PR-15 from the company Nikko Chemicals Co. , Ltd; PELEMOL 6GPR from the company Phoenix Chemical, Inc. ;

Polycare P 5 from the company Biogenico World Wide; Sunsoft 818H, 818SK, 818TY from the company Taiyo Kagaku Company, Ltd), - Polyglyceryl-10 polyricinoleate (Phytoglyn AO from the company Maruzen Pharmaceuticals Co., Ltd),

- Polyglyceryl-2 diisostearate (Prisorine 3792 from the company Croda Europe, Ltd, Dermol DGDIS from the company Alzo/Bernel Chemical),

- Polyglyceryl-3 diisostearate (Lameform TGI sold by the company COGNIS),

- Polyglyceryl-6 diisostearate (Emalex DISG-6 from the company Nihon Emulsion Company, Ltd),

- Polyglyceryl-10 diisostearate (Emalex DISG-10 from the company Nihon Emulsion Company, Ltd),

and mixtures thereof.

Use will be made even more particularly of a mixture of polyglyceryl-3 polyricinoleate and polyglyceryl-3 diisostearate. The examples that follow serve to illustrate the invention.

Examples

Compositions 1 to 2 below were prepared. The ingredients are given as weight percentages of active material relative to the total weight of the composition.

Phase Ingredients Ex. 3 O Ex. 4 O

Ai Polyglyceryl-3 diisostearate 2 2

Polyglyceryl-3 polyricinoleate 2 2

Beeswax 0.5 0.5

Jojoba oil 10 8

Dicaprylyl ether 10 8

Tocopherol 0.5 0.5

Titanium dioxide (and) isohexadecane 12 (and) triethylhexanoin (and) aluminium

stearate (and) alumina (and)

polyhydroxystearic acid

(Solaveil CT-200-LQ-(WD) - Croda)

(T1O₂ particles with a mean size < 0.1 pm)

Bi Glycerol 5 5

Water qs 100 qs 100

Sodium benzoate 0.5 0.5

Sodium phytate 0.15 0.15

B₂ Xanthan gum 0.2 0.2

B₃ Magnesium sulfate 1 .5 1 .5

B₄ Citric acid 0.037 0.037

C Titanium dioxide (and) alumina (and) 13.00

jojoba esters

(MPT-154-NJE8 - KODO)

(T1O₂ particles B hydrophobic-treated with

at least one oil of natural origin)

Titanium dioxide (and) aluminium 6.40 hydroxide (and) stearic acid

(Microtitanium dioxide MT-100TV - Tayca)

(T1O₂ particles with a mean size < 0.1 pm)

D Alcohol 5 5

These compositions 1 to 4 were evaluated as regards their screening efficacy. They each contain the same total amount of titanium dioxide: 10% by weight of active material.

Emulsion preparation method:

Ai is heated to 75-80°C (clear solution). In parallel, all the compounds of Bi are weighed out in another beaker and stirred using a deflocculator until dissolved. B₂ is sprinkled in and stirred until dissolved/gelled. B₃ is added, followed by B₄. B is introduced slowly (1 to 2 minutes approximately) into A in an emulsifying machine up to 2000 rpm, and then for 6 to 7 minutes at 3000 rpm. The mixture is cooled while stirring with a butterfly spindle. C is added. At a temperature below 30°C, D is added over 5 minutes. in vitro protocol for evaluating the screening efficacy in vitro SPF

The sun protection factor (SPF) is determined according to the in vitro method described by B. L. Diffey in J. Soc. Cosmet. Chem. 40, 127-133 (1989). The measurements were taken using a UV-2000S spectrophotometer from the company Labsphere. Each composition is applied to a rough plate of PMMA, in the form of a homogeneous and even deposit at a rate of 0.6 mg/cm² in vitro PPD index

To measure the UV-A protection index, the PPD (persistent pigment darkening) method, which measures the skin colour observed 2 to 4 hours after exposing the skin to UV-A, is particularly recommended and used. This method has been adopted since 1996 by the Japanese Cosmetic Industry Association (JCIA) for the UV-A labelling of products and is frequently used by test laboratories in Europe and the United States (Japan Cosmetic Industry Association Technical Bulletin. Measurement Standards for UVA protection efficacy. Issued November 21 , 1995 and effective as of January 1 , 1996).

The UVAPPD protection factor (UVAp_PD PF) is expressed mathematically by the ratio of the UV-A radiation dose necessary to reach the pigmentation threshold with the UV-screening agent (MPPDp) to the UV-A radiation dose necessary to reach the pigmentation threshold without UV-screening agent (MPPDnp).

MPPDp

r^o MPPDnp

The measurements were taken according to an in vitro test using a UV-2000S spectrophotometer from the company Labsphere. Each composition is applied to a rough plate of PMMA, in the form of a homogeneous and even deposit at a rate of 0.6 mg/cm². Results

TABLE I

The test results show that compositions 1 and 2 according to the invention containing at least the combination of composite particles A and of T1O2 particles B hydrophobic-modified with a natural oil have a higher SPF and a higher UVA protection index

- than composition 3 comprising only T1O2 particles B hydrophobic-modified with a natural oil;

- than composition 4 comprising only T1O2 particles with a mean size < 0.1 pm.

Claims

1. Composition containing, in a cosmetically acceptable medium:

a) at least composite particles A with a mean size of between 100 nm and 30 pm, comprising a matrix and an inorganic UV-screening agent, the said inorganic screening agent being present in a content ranging from 1 % to 70% by weight relative to the total weight of the composite particle,

b) at least particles B of an inorganic UV-screening agent, which are hydrophobic- treated with at least one oil or wax of natural origin;

c) and optionally an oily dispersion of hydrophobic particles C of inorganic UV- screening agent with a mean size of greater than 0.1 pm; the said particles C being different from the particles B.

2. Composition according to Claim 1 , in which the matrix comprises one or more organic and/or inorganic materials.

3. Composition according to Claim 1 or 2, in which the composite particles A are formed from a matrix comprising an organic and/or inorganic material, in which particles of inorganic UV-screening agent are included.

4. Composition according to Claim 1 or 2, in which the composite particles A contain a matrix made of an organic and/or inorganic material, covered with at least one layer of inorganic UV-screening agent which may be connected to the matrix by means of a binder.

5. Cosmetic composition according to either of Claims 1 and 2, in which the composite particle A contains an inorganic UV-screening agent covered with at least one layer of an organic and/or inorganic material.

6. Composition according to any one of Claims 1 to 5, in which the inorganic UV- screening agent is chosen from metal oxides, in particular from titanium, zinc or iron oxides and more particularly titanium dioxide (T1O2).

7. Composition according to Claim 6, in which the composite particles A are chosen from spherical composite particles and non-spherical composite particles, or mixtures thereof.

8. Composition according to Claim 7, in which the matrix of the spherical composite particles A contains a material or a mixture of materials chosen from: - Si0₂,

- PMMA,

- copolymers of styrene and of a C1 /C5 alkyl acrylate,

- polyamides, such as nylon.

9. Composition according to Claim 7, in which the matrix of the non-spherical composite particles A contains a material or a mixture of materials chosen from:

- alumina,

- an alumina/triethoxycaprylylsilane mixture, talc,

silica,

mica.

10. Composition according to any one of Claims 1 to 9, in which the oil or wax of natural origin is chosen from jojoba esters.

11. Composition according to any one of Claims 1 to 10, in which, in the oily dispersion of hydrophobic-modified particles C of inorganic UV-screening agent, the said particles are treated with at least one linear or branched C12-C18 fatty acid and in particular stearic acid.

12. Composition according to any one of Claims 1 to 1 1 , in which the oil present in the dispersion of hydrophobic-modified particles C of inorganic UV-screening agent is chosen from C12-C15 alkyl benzoates and triglycerides such as caprylic/capric triglyceride.

13. Composition according to any one of Claims 1 to 12, comprising at least one anhydrous phase containing at least one polar oil preferably with a surface tension of greater than or equal to 10 mN/m at 25°C and at atmospheric pressure, and in particular dicaprylyl ether.

14. Composition according to any one of Claims 1 to 13, characterized in that it is in the form of a water-in-oil emulsion.

15. Composition according to Claim 14, comprising at least one emulsifying surfactant preferably having an HLB of less than or equal to 5 at 25°C and more preferentially chosen from alkyl esters or ethers of sorbitan, of polyol, of glycerol or of sugars.

16. Composition according to Claim 14, in which the emulsifying surfactant is chosen from polyglycerolated diesters and polyesters and especially chosen from:

- Polyglyceryl-3 polyricinoleate,

- Polyglyceryl-4 polyricinoleate,

- Polyglyceryl-5 polyricinoleate,

- Polyglyceryl-6 polyricinoleate,

- Polyglyceryl-10 polyricinoleate,

- Polyglyceryl-2 diisostearate,

- Polyglyceryl-3 diisostearate,

- Polyglyceryl-6 diisostearate,

- Polyglyceryl-10 diisostearate,

and mixtures thereof, and more particularly a mixture of polyglyceryl-3 ricinoleate and polyglyceryl-3 diisostearate.