Composition containing composite particles for screening out UV radiation, with a mean size of greater than 0.1 ÂμM, and hydrophobic silica aerogel particles

Abstract

The present invention relates to a composition comprising, in a cosmetically acceptable medium: a) composite particles with a mean size of greater than 0.1 m, containing a matrix comprising i) at least one organic material and/or at least one mineral material and ii) at least titanium dioxide; and b) hydrophobic silica aerogel particles. The invention also relates to a cosmetic process for caring for and/or making up human keratin materials, especially bodily or facial skin or the hair, comprising at least the application, to the surface of the keratin material, of a composition as defined previously. 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 material, of a composition as defined previously. The invention also relates to a non-therapeutic 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 previously.

Claims

1. A composition comprising, in a cosmetically acceptable medium: a) composite particles with a mean size of greater than 0.1 m, containing a matrix comprising i) at least one organic material and/or at least one mineral material and ii) at least titanium dioxide, optionally treated with at least one surface-treatment agent; and b) hydrophobic silica aerogel particles having a hydrophobic silica aerogel particles have a specific surface area per unit of mass (S.sub.M) ranging from 600 to 1200 m.sup.2/g.

2. The composition according to claim 1, in which the hydrophobic silica aerogel particles have a specific surface area per unit of mass (S.sub.M) ranging from 600 to 800 m.sup.2/g and a size, expressed as the volume-mean diameter (D[0.5]), of less than 1500 m.

3. The composition according to claim 1, wherein the hydrophobic silica aerogel particles have at least one of the following conditions: a tapped density ranging from 0.04 g/cm.sup.3 to 0.10 g/cm.sup.3; a specific surface area per unit of volume SV ranging from 5 to 60 m.sup.2/cm.sup.3; an oil-absorbing capacity, measured at the wet point, ranging from 5 to 18 ml/g.

4. The composition according to claim 1, wherein the hydrophobic silica aerogel particles are silica particles modified with trimethylsilyl groups.

5. The composition according to claim 1, wherein the composite particles are chosen from: (i) composite particles containing a matrix comprising an organic and/or mineral material, in which matrix particles of mineral UV-screening agent are included; (ii) composite particles containing a matrix comprising an organic and/or mineral material, which matrix is covered with at least one layer of mineral UV-screening agent which can be connected to the matrix by means of a binder; (iii) composite particles containing at least one mineral UV-screening agent covered with at least one layer of an organic and/or mineral material.

6. The composition according to claim 1, wherein the matrix of the composite particle contains a material or a mixture of materials chosen from: silica, talc, mica, alumina, an alumina/triethoxycaprylylsilane mixture, polymethyl methacrylate, copolymers of styrene and of (meth)acrylic acid or a (C.sub.1-C.sub.20)alkyl ester thereof, polyamides, and mixtures thereof.

7. The composition according to claim 1, wherein the composite particles comprise at least one core particle A with a mean size of greater than 0.1 m and less than 1 m; the surface of the said core being at least partially covered with at least one layer of at least one mineral UV-screening agent.

8. The composition according to claim 7 wherein the composite particles comprise: a) at least one core particle A with a mean size of greater than 0.1 m and less than 1 m; the surface of the said core being at least partially covered with at least one layer of titanium dioxide, and b) at least one core particle B with a mean size of at least 2 m; the surface of the said core being at least partially covered with at least one layer of titanium dioxide.

9. The composition according to claim 7, wherein the composite particles comprise: a) at least one hollow spherical core particle A with a mean size of greater than 0.1 m and less than 1 m, comprising at least one copolymer of styrene and of (meth)acrylic acid or a (C.sub.1-C.sub.20)alkyl ester thereof; the surface of the said core A being at least partially covered with at least one layer of titanium dioxide, b) at least one spherical core particle B with a mean size of at least 2 m, comprising at least one poly(meth)acrylate; the surface of the said core B being at least partially covered with at least one layer of titanium dioxide.

10. The composition according to claim 7, wherein the composite particles are prepared according to a mechanochemical melting process.

11. The composition according to claim 1, wherein it also comprises at least one dextrin ester.

12. The composition according to claim 1, wherein it is in the form of a gel, a simple or complex emulsion or in anhydrous form.

13. A cosmetic process for caring for and/or making up human keratin materials comprising at least the application, to the surface of the keratin material, of a composition as defined according to claim 1.

14. A non-therapeutic 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 according to claim 1.

15. A non-therapeutic 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 according to claim 1.

16. The composition according to claim 3, in which the hydrophobic silica aerogel particles have a specific surface area per unit of mass (S.sub.M) ranging from 600 to 800 m.sup.2/g and a size, expressed as the volume-mean diameter (D[0.5]), ranging from 1 to 30 m.

17. The composition according to claim 1 wherein the hydrophobic silica aerogel particles have all of the following conditions: a tapped density p ranging from 0.04 g/cm.sup.3 to 0.10 g/cm.sup.3; a specific surface area per unit of volume SV ranging from 5 to 60 m.sup.2/cm.sup.3; an oil-absorbing capacity, measured at the wet point, ranging from 5 to 18 ml/g.

18. The composition according to claim 2 wherein the hydrophobic silica aerogel particles have at least one of the following conditions: a tapped density p ranging from 0.04 g/cm.sup.3 to 0.10 g/cm.sup.3; a specific surface area per unit of volume SV ranging from 5 to 60 m.sup.2/cm.sup.3; an oil-absorbing capacity, measured at the wet point, ranging from 5 to 18 ml/g.

19. The composition according to claim 2, wherein the hydrophobic silica aerogel particles are silica particles modified with trimethylsilyl groups.

20. The composition according to claim 3, wherein the hydrophobic silica aerogel particles are silica particles modified with trimethylsilyl groups.

Description

EXAMPLES

Examples 1 to 2

(1) The components indicated in Table 1 were placed in a hybridizer equipped with a high-speed rotor fitted with a plurality in a dry chamber in a Nara Machinery device, to obtain a composite material.

(2) The components indicated in Table 1 were mixed in the indicated proportions in a plastic bag shaken by hand for a short period. The mixture was placed in the hybridizer machine and the rotor speed was set at 8000 rpm (linear velocity of 100 m/s) for 3 minutes.

(3) The UV absorbance was evaluated for each composite UV-screening agent 1 to 4 with a V-500 model UV/visible spectrophotometer (Jasco, Japan) under the following conditions:

(4) A solvent was prepared by mixing isododecane and polyhydroxystearic acid such that the polyhydroxystearic acid concentration was 3% by weight.

(5) Each composite UV-screening agent was dispersed in the said solvent thus obtained by ultrasonication for 1 minute to obtain a sample suspension at 0.1% by weight in the said solvent. If the agglomerates are still present, the ultrasonication treatment is repeated.

(6) The sample thus obtained was placed in a quartz cell with a light path length of 2 mm. The absorbance of each sample was measured in the wavelength range from 280 to 400 nm with a V-500 model UV/visible spectrophotometer (Jasco, Japan). The results are given in Table 1 below.

(7) TABLE-US-00001 TABLE 1 Composite UV- UV- screening screening UV agent Core particle A Core particle B agent absorbance Mean size 0.35 m 6 m 0.015 m Material Styrene/Acrylate Polymethyl TiO.sub.2 .sup.(3) Copolymer .sup.(1) methacrylate .sup.(2) Example 1 35 15 50 129 Example 2 50 20 30 103 .sup.(1) Styrene/Acrylate Copolymer: Sunspheres - Rhm & Haas .sup.(2) PMMA MR-7GC - Soken .sup.(3) TiO.sub.2: MT-100 TV - Tayca

Examples 3 to 7

(8) The water-in-oil emulsions 3 to 7 were prepared according to the following protocol:

(9) The oily phase A.sub.1 was prepared by mixing the starting materials with mechanical stirring at 70-80 C. The phases A.sub.2, A.sub.3 and A.sub.4 were added after cooling of A.sub.1 to about 60-65 C. The aqueous phase (B.sub.1, B.sub.2, B.sub.3) was prepared by mixing the starting materials with mechanical stirring at 65-70 C. The solutions obtained were macroscopically homogeneous. The emulsion was prepared by slow introduction of the aqueous phase into the oily phase with stirring using a Moritz homogenizer at a stirring speed of 4500 rpm for 10 minutes. The oily phase C was added to the emulsion obtained with gentle stirring. The emulsion obtained was cooled to room temperature with slow stirring and phase D was then added. The final emulsion was characterized by drops of between 1 m and 10 m in size.

(10) These compositions were evaluated according to the following properties: Sedimentation of the particles Aggregation of the particles

(11) The examples were compared with a particle content equal to 5% by weight relative to the total weight of the composition.

(12) Evaluation

(13) The formulae were first centrifuged at 2000 rpm for 30 minutes.

(14) The sedimentation of the particles was evaluated visually.

(15) The aggregation of the particles was evaluated by optical microscopy observation with a 20 objective lens.

(16) The sedimentation and aggregation of the particles were graded + or

(17) + sedimentation observed and aggregation observed by microscope

(18) absence of sedimentation and absence of aggregation observed by microscope

(19) TABLE-US-00002 Ex. Ex. Phase INCI Name 3 4 (*) A1 PEG-30 dipolyhydroxystearate 2.00 2.00 Synthetic wax 1.00 1.00 Octocrylene 2.50 2.50 Butylmethoxydibenzoylmethane 3.00 3.00 Ethylhexyl triazone 1.00 1.00 Bis(ethylhexyloxyphenol)methoxyphenyltriazine 2.00 2.00 Drometrizole trisiloxane 0.50 0.50 Ethylhexyl salicylate 5.00 5.00 C12-15 Alkyl benzoate 7.50 7.50 Caprylic/capric triglyceride 5.00 5.00 Caprylyl glycol 0.50 0.50 Silica silylate 2.00 (VM 2270) A2 Lauryl PEG/PPG-18/18 methicone (and) 2.00 2.00 dodecene (and) poloxamer 407 Cyclohexasiloxane 6.00 6.00 A3 Composite screening agent according to 5 5 Example 1 (mean elementary size > 0.1 m) Tocopherol 0.20 0.20 Silica 0.10 0.10 B1 Water 30.11 32.11 Ammonium polyacryloyldimethyl taurate 0.50 0.50 B2 Glycerol 2.00 2.00 Propylene glycol 4.00 4.00 Pentasodium ethylenediamine tetramethylene 0.30 0.30 phosphonate B3 Terephthalylidenedicamphorsulfonic acid 4.50 4.50 Triethanolamine 0.78 0.78 C Cyclopentasiloxane (and) disteardimonium 2.00 2.00 hectorite (and) denatured alcohol Isododecane 4.50 4.50 D Denatured alcohol 6.00 6.00 Aggregation and sedimentation after + 2000 rpm for 30 minutes (*) outside the invention

(20) It was observed that, in formula 4 outside the invention, the composite particles based on TiO.sub.2 screening out UV radiation, with a mean size of greater than 0.1 m, sediment in the absence of hydrophobic silica aerogel particles.

(21) However, by adding silica aerogel particles in formula 3 according to the invention, it was found that the dispersion of the particles of the composites based on TiO.sub.2 was improved.

(22) TABLE-US-00003 Ex. Ex. Phase INCI Name 5 (*) 6 A1 PEG-30 dipolyhydroxystearate 2.00 2.00 Synthetic wax 1.00 1.00 Octocrylene 2.50 2.50 Butylmethoxydibenzoylmethane 3.00 3.00 Ethylhexyl triazone 1.00 1.00 Bis(ethylhexyloxyphenol)methoxyphenyltriazine 2.00 2.00 Drometrizole trisiloxane 0.50 0.50 Ethylhexyl salicylate 5.00 5.00 C12-15 Alkyl benzoate 7.50 7.50 Caprylic/capric triglyceride 5.00 5.00 Caprylyl glycol 0.50 0.50 Dextrin palmitate 1.00 (Rheopearl KL2 - OR) Silica silylate (Aerogel) 1.00 A2 Lauryl PEG/PPG-18/18 methicone (and) 2.00 2.00 dodecene (and) poloxamer 407 Cyclohexasiloxane 6.00 6.00 A3 Tocopherol 0.20 0.20 Composite screening agent 5.00 5.00 Silica and titanium dioxide (Sunjin TIN 50) (mean size: 2-7 m) Silica 0.10 0.10 B1 Water 32.11 30.11 Ammonium polyacryloyldimethyl taurate 0.50 0.50 B2 Glycerol 2.00 2.00 Propylene glycol 4.00 4.00 Pentasodium ethylenediamine tetramethylene 0.30 0.30 phosphonate B3 Terephthalylidenedicamphorsulfonic acid 4.50 4.50 Triethanolamine 0.78 0.78 C Cyclopentasiloxane (and) disteardimonium 2.00 2.00 hectorite (and) denatured alcohol Isododecane 4.50 4.50 D Denatured alcohol 6.00 6.00 Aggregation and sedimentation after + 2000 rpm for 30 minutes (*) outside the invention

(23) It was observed that, in formula 5, the composite particles based on TiO.sub.2 screening out UV radiation, with a mean size of greater than 0.1 m, sediment in the absence of hydrophobic silica aerogel particles.

(24) However, by adding silica aerogel particles in formula 6 according to the invention, it was found that the dispersibility of the particles of the composites based on TiO.sub.2 was improved.

Examples 3 and 7

(25) Protocol for evaluating the sensory effect after application to the skin

(26) The sensory effect after application of the formula to the skin is evaluated by applying the formula to a forearm at a rate 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 sensory smoothness was graded + or .

(27) + smooth

(28) coarse

(29) TABLE-US-00004 Ex. Ex. Phase INCI Name 3 7 A1 PEG-30 dipolyhydroxystearate 2.00 2.00 Synthetic wax 1.00 1.00 Octocrylene 2.50 2.50 Butylmethoxydibenzoylmethane 3.00 3.00 Ethylhexyl triazone 1.00 1.00 Bis(ethylhexyloxyphenol)methoxyphenyltriazine 2.00 2.00 Drometrizole trisiloxane 0.50 0.50 Ethylhexyl salicylate 5.00 5.00 C12-15 Alkyl benzoate 7.50 7.50 Caprylic/capric triglyceride 5.00 5.00 Caprylyl glycol 0.50 0.50 Dextrin palmitate 1.00 (Rheopearl KL2 - OR) Silica silylate 2.00 1.00 (VM 2270) A2 Lauryl PEG/PPG-18/18 methicone (and) 2.00 2.00 dodecene (and) poloxamer 407 Cyclohexasiloxane 6.00 6.00 A3 Composite screening agent according to 5.00 5.00 Example 1 (mean elementary size > 0.1 m) Tocopherol 0.20 0.20 Silica 0.10 0.10 B1 Water 30.11 30.11 Ammonium polyacryloyldimethyl taurate 0.50 0.50 B2 Glycerol 2.00 2.00 Propylene glycol 4.00 4.00 Pentasodium ethylenediamine tetramethylene 0.30 0.30 phosphonate B3 Terephthalylidenedicamphorsulfonic acid 4.50 4.50 Triethanolamine 0.78 0.78 C Cyclopentasiloxane (and) disteardimonium 2.00 2.00 hectorite (and) denatured alcohol Isododecane 4.50 4.50 D Denatured alcohol 6.00 6.00 Sensory result + (*) outside the invention

(30) By adding dextrin palmitate in formula 7 according to the invention, it was found that the sensory result was smoother and more pleasant.