COMPOSITION BASED ON MULTILAYER SPHERICAL COMPOSITE PARTICLES AND ON A UV-SCREENING AGENT

Abstract

A subject matter of the present invention is a composition comprising: a) at least multilayer spherical composite particles comprising i) a core comprising at least one material A having a refractive index ranging from 1.3 to 1.8; and ii) at least one layer covering said core, comprising at least one material B having a refractive index ranging from 1.9 to 3.1; and iii) optionally at least one second layer covering the material B, comprising at least one material C having a refractive index ranging from 1.3 to 1.8; said composite particles being present in an amount less than 28.0% by weight relative to the total weight of the composition; and b) at least one UV-screening agent.

This composition is for topical use and is more particularly intended for the photoprotection of the skin and/or hair against ultraviolet (UV) radiation.

Claims

1. A composition comprising: a) at least multilayer spherical composite particles comprising i) a core comprising at least one material A having a refractive index ranging from 1.3 to 1.8; and ii) at least one layer covering said core, comprising at least one material B having a refractive index ranging from 1.9 to 3.1; and iii) optionally at least one second layer covering the material B, comprising at least one material C having a refractive index ranging from 1.3 to 1.8; said composite particles being present in an amount less than 28.0% by weight relative to the total weight of the composition; and b) at least one UV-screening agent.

2. The composition according to claim 1 in which the multilayer spherical composite particles comprise: i) a core comprising at least one material A having a refractive index ranging from 1.3 to 1.8; ii) at least one layer covering said core, comprising at least one material B having a refractive index ranging from 1.9 to 3.1; and iii) at least one second layer covering the material B, comprising at least one material C having a refractive index ranging from 1.3 to 1.8.

3. The composition according to claim 1, in which the multilayer spherical composite particles are characterized by an average diameter of between 0.05 and 45 μm.

4. The composition according to claim 1, in which the multilayer spherical composite particles are present at concentrations ranging from 1% to 25% by weight relative to the total weight of the composition.

5. The composition according to claim 1, in which the materials A, B and C are organic or inorganic.

6. The composition according to claim 1, in which the organic materials A and C are selected from the group consisting of poly(meth)acrylates, polyamides, silicones, polyurethanes, polyethylenes, polypropylenes, polystyrenes, polycaprolactams, polysaccharides, polypeptides, polyvinyl derivatives, waxes, polyesters and polyethers, and mixtures thereof; the inorganic materials A and C are selected from the group consisting of glass, silica, calcium carbonate and aluminium oxide, and mixtures thereof; the inorganic material B is chosen from metal oxides.

7. The composition according to claim 1, in which the materials A and C are silica; the material B is titanium dioxide (TiO.sub.2).

8. The composition according to claim 1, in which the multilayer spherical composite particles comprise: i) a core consisting of silica and ii) at least one layer consisting of titanium dioxide covering said core and iii) at least one second layer consisting of silica covering said titanium dioxide layer.

9. The composition according to claim 1, in which the core based on the material A represents from 1% to 99% by weight relative to the total weight of the spherical composite particle; the layer based on the material B represents from 0.5% to 50% by weight relative to the total weight of the spherical composite particle; the layer based on the material C represents from 0.5% to 50% by weight relative to the total weight of the spherical composite particle.

10. The composition according to claim 1, in which the UV-screening agent is in free form.

11. The composition according to claim 1, in which the organic UV-screening agent(s) is (are) selected from the group consisting of cinnamic compounds; anthranilate compounds; salicylic compounds; dibenzoylmethane compounds; benzylidenecamphor compounds; benzophenone compounds; β,β-diphenylacrylate compounds; triazine compounds; benzotriazole compounds; benzalmalonate compounds; benzimidazole compounds; imidazoline compounds; bis-benzazolyl compounds; p-aminobenzoic (PABA) compounds; methylenebis(hydroxyphenylbenzotriazole) compounds; benzoxazole compounds; screening polymers and screening silicones; α-alkylstyrene-based dimers; 4,4-diarylbutadiene compounds; merocyanines, and mixtures thereof.

12. The composition according to claim 11, in which the organic screening agent(s) is (are) selected from the group consisting of Ethylhexyl methoxycinnamate, Ethylhexyl salicylate, Homosalate, Butyl methoxy dibenzoylmethane, Octocrylene, Phenylbenzimidazolesulfonic acid, n-Hexyl 2-(4-diethylamino-2-hydroxybenzoyl)benzoate, Terephthalylidenedicamphorsulfonic acid, Methylenebis(benzotriazolyl)tetramethylbutylphenol, 2,4,6-tris(diphenyl)triazine, Bis(ethylhexyloxyphenol)methoxyphenyltriazine, Ethylhexyl triazone, Diethylhexyl butamido triazone, Drometrizole trisiloxane, and mixtures thereof.

13. The composition according to claim 1, in which the UV-screening agent is selected from the group consisting of inorganic UV-screening agents, and more preferentially coated or uncoated metal oxides having an average elementary particle size of less than or equal to 0.5 μm.

14. The composition according to claim 1, comprising, in addition, at least one crosslinked copolymer of methacrylic acid and of C.sub.1-C.sub.4 alkyl acrylate.

15. The composition according to claim 1, comprising, in addition, at least one semi-crystalline polymer which is solid at ambient temperature and which has a melting point greater than or equal to 30° C., comprising a) a polymer backbone and b) at least one crystallizable organic side chain and/or one crystallizable organic block which is part of the backbone of said polymer, said polymer having a number-average molecular weight Mn greater than or equal to 1000.

16. The composition according to claim 1, comprising, in addition, hollow latex particles having a particle size ranging from 150 to 380 nm.

17. The composition according to claim 1, comprising, in addition, at least one surfactant of formula (I) below: ##STR00003## in which: R.sub.1 and R.sub.3 denote, independently of each other, an alkyl radical containing from 1 to 25 carbon atoms; R.sub.2 denotes a spacer group consisting of a linear or branched alkylene chain containing from 1 to 12 carbon atoms; X denotes a —(C.sub.2H.sub.4O).sub.a—(C.sub.3H.sub.6O).sub.bZ group Y denotes a —(C.sub.2H.sub.4O)c-(C.sub.3H.sub.6O).sub.dZ group where: Z denotes a hydrogen atom or a —CH.sub.2—COOM, —SO.sub.3M, —P(O)(OM).sub.2, —C.sub.2H.sub.4—SO.sub.3M, —C.sub.3H.sub.6—SO.sub.3M or —CH.sub.2(CHOH).sub.4CH.sub.2OH radical, where M, M′ represent H or an alkali metal ion or alkaline-earth metal ion or ammonium ion or alkanolammonium ion, a and c, independently of one another, range from 0 to 15, b and d, independently of one another, range from 0 to 10, and the sum of a+b+c+d ranges from 1 to 25; and n ranges from 1 to 10, and more particularly the compound disodium ethylene dicocamide PEG-15 disulfate, having the following structure: ##STR00004## where RCO represents a coconut fatty acid radical and m+n has an average value of 15.

18. A cosmetic process for caring for and/or making up a keratin material, comprising the application, to the surface of said keratin material, of a composition according to the invention as defined in claim 1.

19. A cosmetic process for limiting the darkening of the skin and/or improving the colour and/or uniformity of the complexion, comprising the application, to the surface of the keratin material, of a composition as defined in claim 1.

20. A cosmetic process for preventing and/or treating the signs of ageing of a keratin material, comprising the application, to the surface of the keratin material, of a composition as defined in claim 1.

Description

EXAMPLES

Preparation Example A

[0253] A solution of aqueous ammonia was added dropwise to an ethanolic solution containing 2% by weight of monomethyltriethoxysilane, with stirring, for 3 hours, so as to obtain spherical silica particles with a diameter of 0.8 μm. An isopropanolic solution containing 3% by weight of titanium isopropoxide was provided, with stirring, under a nitrogenous atmosphere, and the resulting particles were filtered off and rinsed, heated in an oven at 300° C. for 4 hours and left to cool to ambient temperature. A hydrated solution of isopropanol containing 5% of titanium hydrolysate was brought into contact with the silica particles in such a way that said hydrolysate adheres to their surface. The particles thus coated were filtered off, rinsed, then heated in an often at 300° C. for 4 hours. The resulting powder was brought into contact with an ethanolic solution containing 10% of tetraethoxysilane. A 1 N hydrochloric acid solution was added dropwise, with stirring, for 24 hours so as to form a layer of silica on the surface of the particles. The powder obtained could then be calcined at 800° C. so as to obtain the multilayer spherical particles. At each coating step, the peak intensity corresponding to the content of titanium dioxide was then measured by X-ray diffraction. The silica (core)/titanium dioxide (first layer)/silica (second layer) content as % weight was 85/5/10 and the diameter of the particles obtained after calcination was 0.6 μm.

[0254] Compositions 1 to 4 below were prepared:

TABLE-US-00001 Ex 4 (outside the in- Phase Ingredients Ex 1 Ex 2 Ex 3 vention) A1 Water 15 15 15 15 Glycerol 4 4 4 4 STYRENE/ACRY- 2 2 2 2 LATES COPOLYMER (Sunspheres Powder ®) A2 Caprylyl glycol 0.3 0.3 0.3 0.3 Glycol 4 4 4 4 EDTA 0.1 0.1 0.1 0.1 B1 Ceralution H ® 3 3 3 3 Alcohol 0.75 0.75 0.75 0.75 Isononyl isononanoate 2 2 2 2 C12-15 alkyl benzoate 4 4 4 4 (Finsolv TN ®) Poly(stearyl acrylate) 1 1 1 1 (Intelimer IPA 13-1 ®) Diisopropyl sebacate 4 4 4 4 Octocrylene 3.5 3.5 3.5 3.5 Avobenzone 3 3 3 3 Ethylhexyl Triazone 2.3 2.3 2.3 2.3 (Uvinul T150 ®) Drometrizole Trisiloxane 0.5 0.5 0.5 0.5 (Mexoryl XL ®) B2 Cyclohexasiloxane 2 2 2 2 (Silsoft 1217 ®) B3 Vitamin E 0.1 0.1 0.1 0.1 C Water qs 100 qs 100 qs 100 qs 100 D Hostacerin AMPS ® 0.5 0.5 0.5 0.5 E Crosslinked methacrylic 2 2 2 2 acid/ethyl acrylate copoly- mer (Carbopol Aqua SF1 ®) F Triethanolamine 0.4 0.4 0.4 0.4 G Multilayer spherical 1.5 10 25 28 composite particles SiO.sub.2/TiO.sub.2/SiO.sub.2 82/5/13% by weight with average diameter of 0.6 μm (STM ACS 005050510 ®) H Terephthalylidenedi- 1.5 1.5 1.5 1.5 camphorsulfonic acid (Mexoryl SX ®) Triethanolamine 0.26 0.26 0.26 0.26 I Alcohol 7 7 7 7

[0255] Compositions 1 and 5 below were prepared:

TABLE-US-00002 Ex 5 outside the in- Phase Ingredients Ex 1 vention A1 Water 15 15 Glycerol 4 4 STYRENE/ACRYLATES 2 2 COPOLYMER (Sunspheres Powder ®) A2 Caprylyl glycol 0.3 0.3 Glycol 4 4 EDTA 0.1 0.1 B1 Ceralution H ® 3 3 Alcohol 0.75 0.75 Isononyl isononanoate 2 2 C12-15 alkyl benzoate (Finsolv TN ®) 4 4 Poly(stearyl acrylate) (Intelimer IPA 13-1 ®) 1 1 Diisopropyl sebacate 4 4 Octocrylene 3.5 3.5 Avobenzone 3 3 Ethylhexyl Triazone (Uvinul T150 ®) 2.3 2.3 Drometrizole Trisiloxane (Mexoryl XL ®) 0.5 0.5 B2 Cyclohexasiloxane (Silsoft 1217 ®) 2 2 B3 Vitamin E 0.1 0.1 C Water qs 100 qs 100 D Hostacerin AMPS ® 0.5 0.5 E Crosslinked methacrylic acid/ethyl acrylate 2 2 copolymer (Carbopol Aqua SF1 ®) F Triethanolamine 0.4 0.4 G Multilayer spherical composite particles 1.5 1.5 SiO.sub.2/TiO.sub.2/SiO.sub.2 82/5/13% by weight with average diameter of 0.6 μm (STM ACS 005050510 ®) Platelet-shaped composite particles of TiO.sub.2/ — 1.5 Talc (TTC-30 ®) H Terephthalylidenedicamphorsulfonic acid 1.5 1.5 (Mexoryl SX ®) Triethanolamine 0.26 0.26 I Alcohol 7 7

Emulsion Preparation Method:

[0256] The aqueous phase A and oily phase B1 are prepared by mixing the raw materials, with mechanical stirring, at 80° C.; the solutions obtained are macroscopically homogeneous. The emulsion is prepared by slow introduction of the oily phase into the aqueous phase with stirring using a Moritz homogenizer at a stirring speed of 4000 rpm for 15 minutes. The emulsion obtained is cooled, with stirring, to 40° C., then the oily phase B2 and B3 is added thereto with gentle stirring, followed by the phase C. The emulsion obtained is cooled to ambient temperature, then the remaining phases are added thereto with slow stirring. It is characterized by drops less than 10 μm in size.

Protocol for Evaluating In Vitro the Screening Efficiency

[0257] 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 made using a UV-1000S spectrophotometer from the company Labsphere. Each composition is applied to a rough plate of PMMA, in the form of a uniform and even deposit in a proportion of 1 mg/cm.sup.2.

Protocol for Evaluating the Stability of the Compositions of the Invention

[0258] The stability of the compositions of the invention is evaluated by macroscopic and microscopic observations of their appearance. A composition is judged to be stable (+) when these appearances do not vary over time. A composition is judged to be unstable (−) when at least one of these appearances varies. The examples illustrate this stability of a period of 9 months at ambient temperature.

Protocol for Evaluating the Glide after Application to the Skin

[0259] The glide after application of the formula to the skin is evaluated by applying the formula to a forearm in a proportion of 2 mg/cm.sup.2, waiting for a drying time equal to 2 minutes and then assessing the friction force felt between the fingers and the surface of the forearm. The results are given in the table below:

TABLE-US-00003 EX 4 outside the Measurements Ex 1 Ex 2 Ex 3 invention Stability + + + − Release of oil observable by eye at 9 months In vitro 88.8 ± 8.2 104.1 ± 18.5 142.2 ± 13 197.4 ± 11.4 SPF Glide + + + − (non-greasy) Ex 5 outside the Measurements Ex 1 invention Stability + + In vitro 88.8 ± 8.22 92.5 ± 5.9 SPF

[0260] Compositions 1 to 3 of the invention comprising less than 28.0% by weight of multilayer spherical composite particles (STM ACS 005050510®) have a better stability and better sensory properties than composition 4 outside the invention comprising 28.0% by weight of multilayer spherical composite particles (STM ACS 005050510®).

[0261] Composition 1 of the invention comprising the multilayer spherical composite particles according to the invention (STM ACS 005050510®) alone exhibits an effectiveness and a stability that are equivalent to those of composition 5 (outside the invention according to WO 2012/104161) comprising multilayer spherical particles according to the invention (STM ACS 005050510®) combined with TTC 30® platelet-shaped composite particles.