Composite particles based on mineral UV-screening agent and perlite; cosmetic or dermatological compositions containing the same

Abstract

The present invention relates to novel composite particles based on mineral UV-screening agent and perlite. The present invention also relates to a composition comprising, in a cosmetically acceptable medium, at least composite particles for screening out UV radiation, based on mineral UV-screening agent and perlite. 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 at least one 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 colour and/or uniformity of the complexion, comprising the application, to the surface of the keratin material, of at least one 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 at least one composition as defined previously.

Claims

1. Composite particles for screening out UV radiation, containing at least: i) a matrix comprising perlite particles, wherein the perlite particles have an untamped apparent density at 25 C. ranging from 10 to 400 kg/m.sup.3 and ii) mineral UV-screening agent particles with a mean elementary size of less than 0.1 m, wherein said particles of the mineral UV-screening agent are included in said matrix.

2. The particles according to claim 1, wherein the mineral UV-screening agent is chosen from metal oxides; the said metal oxides may optionally be treated with at least one surface-treatment agent.

3. The particles according to claim 1, wherein the mineral UV-screening agent is titanium dioxide (TiO.sub.2).

4. The particles according to claim 1, wherein the perlite particles are in porous expanded form.

5. The particles according to claim 1, wherein the perlite particles have a particle size defined by a median diameter D.sub.50 ranging from 0.5 to 50 m.

6. The particles according to claim 1, wherein the perlite particles have a particle size distribution such that at least 50% of the particles are less than 20 m in size.

7. The particles according to claim 1, wherein the perlite particles have a particle size distribution such that 90% by weight of the particles are less than 55 m in size.

8. A composition containing, in a cosmetically acceptable medium, at least composite particles as defined according to claim 1.

9. A composition according to claim 8, which is in the form of a gel or a simple or complex emulsion, or in anhydrous form.

10. 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 at least one composition as defined according to claim 8.

11. 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 8.

12. A non-therapeutic cosmetic process for 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 8.

13. A cosmetic process for making the skin matt and/or for reducing its shininess and/or reducing the greasy effect, comprising the topical application, to the skin, of a composition as defined according to claim 8.

14. The particles according to claim 5, wherein the mineral UV-screening agent is chosen from metal oxides; the said metal oxides may optionally be treated with at least one surface-treatment agent.

15. The particles according to claim 1, wherein the mineral UV-screening agent is chosen from titanium, zinc or iron oxides or mixtures thereof; the said metal oxides may optionally be treated with at least one surface-treatment agent.

16. The particles according to claim 2, wherein the mineral UV-screening agent is titanium dioxide (TiO.sub.2).

17. The particles according to claim 2, wherein the perlite particles are in porous expanded form.

18. The particles according to claim 3, wherein the perlite particles are in porous expanded form.

19. The composition according to claim 8 which is in the form of an oil-in-water emulsion characterized by drops of 1 to 10 m in size.

Description

EXAMPLES

Preparation Example A

(1) 100 g of perlite powder sold under the trade name GK-110 Thin by the company Langfang Xindazhong Filter and the company Henan Zhongnan Filter Aid were placed in a flask equipped with a stirrer, and 150 g of titanium tetra-n-butoxide (Super Urecoat Industries) in the form of a suspension were added. The perlite was made to absorb the titanium precursor. An amount of 0.2 to 1 litre of water was then added to allow reaction for 1-8 hours at 30-100 C. Next, the suspension thus obtained was filtered, washed and dried to produce a composite powder of perlite coated with titanium dioxide.

(2) In a second stage, 100 g of this composite powder were placed in a flask, and 150 g of titanium tetra-n-butoxide in suspension form were added. The composite was then made to absorb the titanium precursor. An amount of 0.2 to 1 litre of water was then added to allow reaction for 1-8 hours at 30-100 C. Next, the suspension thus obtained was filtered, washed and dried to produce a composite powder of perlite coated with titanium dioxide. Finally, a composite powder containing 40% by weight of titanium dioxide was obtained.

Preparation Example B

(3) A composite powder based on perlite and titanium dioxide with a mean elementary size of less than 0.1 m was prepared, under the same conditions as in Example A, using a perlite powder sold under the trade name Optimat 2550 by the company World Minerals.

Preparation Example C

(4) A composite powder based on perlite and titanium dioxide was prepared, under the same conditions as in Example A, using a perlite powder sold under the trade name GK-110 Extra Thin by the company Langfang Xindazhong Filter and the company Henan Zhongnan Filter Aid.

Examples 1 to 4

(5) The oil-in-water emulsions 1 to 4 were prepared according to the following protocol.

(6) Preparation of the Emulsions

(7) The aqueous phase (A1, A2, A3) was prepared by mixing the starting materials with mechanical stirring at 65-70 C. The oily phase B1 was prepared by mixing the starting materials with mechanical stirring at 70-80 C. Phases B2 and B3 were added after cooling B1 to about 60-65 C. The solutions obtained are macroscopically homogeneous. The emulsion was prepared by slow introduction of the oily phase into the aqueous 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 phases D, E and F were then added. Phase G was added with stirring until the particles were visibly well dispersed. Finally, phase H was added with slow stirring. It was characterized by drops of between 1 m and 10 m in size.

(8) The examples were compared with a particle content equal to 5%:

(9) TABLE-US-00001 Phase Materials Ex. 1* Ex. 2* Ex. 3* Ex. 4 A1 Water 42.00 42.00 42.00 42.00 Preserving agent 0.40 0.40 0.40 0.40 Glycerol 6.00 6.00 6.00 6.00 Propylene glycol 6.00 6.00 6.00 6.00 Terephthalylidenedicam- 0.90 0.90 0.90 0.90 phorsulfonic acid (Mexoryl SX) Triethanolamine 0.16 0.16 0.16 0.16 A2 EDTA 0.20 0.20 0.20 0.20 A3 Potassium cetyl phosphate 1.00 1.00 1.00 1.00 (Amphisol K) B1 C.sub.12-C.sub.15-Alkylbenzoates 7.50 7.50 7.50 7.50 (Finsolv TN) Octocrylene 7.00 7.00 7.00 7.00 (Uvinul N539 T) Butylmethoxydibenzoyl 3.00 3.00 3.00 3.00 methane (Parsol 1789) Ethylhexyl triazone 0.50 0.50 0.50 0.50 (Uvinul T150) B2 Stearic acid 1.00 1.00 1.00 1.00 Triethanolamine 0.30 0.30 0.30 0.30 Glyceryl stearate (and) 1.00 1.00 1.00 1.00 PEG-100 stearate (Arlacel 165 FL) Dimethylsiloxane 0.50 0.50 0.50 0.50 Preserving agent 0.30 0.30 0.30 0.30 Active agent 0.10 0.10 0.10 0.10 2-Phenoxyethanol 0.70 0.70 0.70 0.70 B3 Titanium dioxide (and) 5.00 2.00 aluminium hydroxide (and) stearic acid (MT 100TV) C Isohexadecane 4.50 4.50 4.50 4.50 Acrylate/C.sub.10-C.sub.30- 0.25 0.25 0.25 0.25 alkylacrylate copolymer (Pemulen TR-1) Xanthan gum 0.10 0.10 0.10 0.10 D Water 1.00 1.00 1.00 1.00 Triethanolamine 0.25 0.25 0.25 0.25 E Water 6.34 6.34 1.34 6.34 F Tween 20 2.00 2.00 2.00 2.00 Perlite (Optimat 2550) 5 3 G Composite particles of 5.00 Example B H Alcohol 2.00 2.00 2.00 2.00 *outside the invention

(10) These compositions were evaluated according to the following properties: the matting effect using a glossmeter the greasy feel on application to the skin
Evaluation Protocols
Matting Effect

(11) The formulas are spread on a contrast card using a film spreader to a thickness of 100 m. The cards are then dried for 24 hours at 37 C. After 24 hours, a solution of a mixture of oleic acid and water is vaporized onto the contrast cards. The shininess of the cards is then measured (60 angle) using a glossmeter.

(12) Greasy Feel after Application to the Skin

(13) The sensory impression 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. After a drying time equal to 2 minutes, the greasy feel between the fingers and at the surface of the forearm is observed and noted:

(14) ++ substantial greasy effect

(15) + presence of greasy effect

(16) absence of greasy effect

(17) In Vitro Protocol for Evaluating the Screening Efficacy

(18) 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 homogeneous and even deposit in a proportion of 1 mg/cm.sup.2.

(19) Results

(20) TABLE-US-00002 Matting effect Greasy Formula Particles (gloss units) in vitro SPF feel Example 1 5% loose TiO.sub.2 47 6.6 55.56 10.6 ++ Comparative particles Example 2 5% loose 21.4 2.8 25.28 3.45 Comparative perlite particles Example 3 3% loose 31.2 3.4 50.44 8.66 + Comparative perlite particles + 2% loose TiO.sub.2 particles Example 4 5% TiO.sub.2- 16.65 2.2 41.40 12.43 (invention) perlite composite particles

(21) It was found that: in Example 1 outside the invention, the use of loose TiO.sub.2 particles without perlite produces, after application to the skin, substantial shininess and a strong greasy feel despite good photoprotective efficacy; in Example 2 outside the invention, the use of loose perlite particles without titanium dioxide leads, after application to the skin, to a reduction in the shininess and the absence of a greasy feel, but leads to a substantial reduction in the photoprotective efficacy; in Example 3 outside the invention, with an SPF comparable to that of Example 1, the use of the combination of loose perlite particles and of loose TiO.sub.2 particles makes it possible to reduce the shininess, but with the presence of a greasy feel; in Example 4 according to the invention, with an SPF comparable to that of Examples 1 and 3, the use of perlite-TiO.sub.2 composite particles leads, surprisingly, after application to the skin, to a more substantial reduction in the shininess and to the absence of a greasy feel.