Emulsion containing organosilicon-based portions of hollow spheres

Abstract

The present invention relates to a composition in the form of an emulsion containing portions of hollow spheres of organosilicon-based material, the portions of hollow spheres having a mean diameter ranging from 0.05 to 10 μm. The invention also relates to physiologically acceptable emulsion compositions comprising hollow spheres, and to a process for fading out skin surface defects, in particular to reduce the sheen of the skin and/or to fade out pores, shadows under the eyes, marks, wrinkles and/or fine lines, comprising the topical application to the skin of the above-mentioned compositions.

1 . A composition in the form of an emulsion comprising, in a physiologically acceptable medium, portions of hollow spheres consisting of organosilicon-based material, the spheres having a mean diameter ranging from 0.05 to 10 μm. 
     
     
         2 . A composition according to  claim 1 , wherein the portions of hollow spheres are obtained according to a process comprising:
 (a) introducing into an aqueous medium, in the presence of a hydrolysis catalyst, and optionally of a surfactant, a compound (I) of formula SiX 4  and a compound (II) of formula RSiY 3 , in which X and Y independently denote a C 1 -C 4  alkoxy group, an alkoxyethoxy group containing a C 1 -C 4  alkoxy group, a C 2 -C 4  acyloxy group, an N,N-dialkylamino group containing a C 1 -C 4  alkyl group, a hydroxyl group, a halogen atom or a hydrogen atom, and R denotes an organic group comprising a carbon atom directly linked to the silicon atom; and   (b) placing the mixture resulting from step (a) in contact with an aqueous solution containing at least one polymerization catalyst and optionally at least one surfactant, at a temperature of between 30 and 85° C., for at least two hours.   
     
     
         3 . A composition according to  claim 2 , wherein the compound of formula (I) is selected from the group consisting of: tetramethoxysilane, tetraethoxysilane, tetrabutoxysilane, trimethoxyethoxysilane, tributoxyethoxysilane, tetraacetoxysilane, tetraprop oxysilane, tetraacetoxysilane, tetra(dimethylamino)silane, tetra(diethylamino)silane, silane tetraol, chlorosilane triol, dichlorodisilanol, tetrachlorosilane, chlorotrihydrogenosilane and mixtures thereof. 
     
     
         4 . A composition according to  claim 2 , wherein the compound of formula (II) comprises an unreactive organic group R and is selected from the group consisting of: methyltrimethoxysilane, ethyltriethoxysilane, propyltributoxysilane, butyltributoxysilane, phenyltrimethoxyethoxysilane, methyltributoxyethoxysilane, methyltriacetoxysilane, methyltripropoxysilane, methyltriacetoxysilane, methyltri(dimethylamino)silane, methyltri(diethylamino)silane, methylsilane triol, methylchlorodisilanol, methyltrichlorosilane, methyltrihydrogenosilane and mixtures thereof. 
     
     
         5 . A composition according to  claim 2 , wherein the compound of formula (II) comprises a reactive organic group R and is selected from the group consisting of: silanes containing an epoxy group; silanes containing a (meth)acryloxy group; silanes containing an alkenyl group; silanes containing a mercapto group; silanes containing an aminoalkyl group; silanes containing a haloalkyl group; silanes containing a glyceroxy group; silanes containing a ureido group; silanes containing a cyano group, and mixtures thereof. 
     
     
         6 . A composition according to  claim 2 , wherein X and/or Y denotes a C 1 -C 4  alkoxy group. 
     
     
         7 . A composition according to  claim 2 , wherein compound (I) is tetraethoxysilane. 
     
     
         8 . A composition according to  claim 2 , wherein compound (II) is methyltrimethoxysilane. 
     
     
         9 . A composition according to  claim 2 , wherein, in (a), the molar ratio of compound (I) to compound (II) ranges from 30:70 to 50:50. 
     
     
         10 . A composition according to  claim 9 , wherein the molar ratio of compound (I) to compound (II) ranges from 35:65 to 45:55. 
     
     
         11 . A composition according to  claim 8 , wherein the molar ratio of compound (I) to compound (II) is 40:60. 
     
     
         12 . A composition according to  claim 2 , wherein the weight ratio of water in said aqueous medium to the total amount of compounds (I) and (II) ranges from 10:90 to 70:30 in step (a). 
     
     
         13 . A composition according to  claim 2 , wherein the hydrolysis and polymerization catalysts are independently selected from the group consisting of sodium hydroxide, sodium carbonate, acetic acid, sodium dodecylbenzenesulfonate, hydrochloric acid and mixtures thereof. 
     
     
         14 . A composition according to  claim 2 , wherein the surfactant is sodium dodecylbenzenesulfonate. 
     
     
         15 . A composition according to  claim 1 , wherein the portions of hollow spheres comprise a crosslinked polysiloxane of three-dimensional structure consisting of units of formula (I): SiO 2  and of formula (II): R 1 SiO 1.5  in which R 1  denotes an organic group containing a carbon atom directly linked to the silicon atom. 
     
     
         16 . A composition according to  claim 15 , wherein R 1  is an unreactive organic group selected from the group consisting of: a methyl, ethyl, propyl, butyl group or a phenyl group. 
     
     
         17 . A composition according to  claim 15 , wherein R 1  is a reactive organic group selected from the group consisting of: an epoxy group, a (meth)acryloxy group, an alkenyl group, a mercaptoalkyl, aminoalkyl or haloalkyl group, a glyceroxy group, a ureido group or a cyano group, containing from 2 to 6 carbon atoms. 
     
     
         18 . A composition according to  claim 16 , wherein R′ denotes a methyl group. 
     
     
         19 . A composition according to  claim 1 , wherein the portions of hollow spheres have a shape formed (in longitudinal cross section) from a small inner arc ( 11 ), a large outer arc ( 21 ) and segments ( 31 ) linking the ends of the respective arcs, the width (W 1 ) between the two ends of the small inner arc ( 11 ) ranging from 0.01 to 8 μm on average, the width (W 2 ) between the two ends of the large outer arc ( 21 ) ranging from 0.05 to 10 μm on average and the height (H) of the large outer arc ( 21 ) ranging from 0.015 to 8 μm on average. 
     
     
         20 . A composition according to  claim 19 , wherein the segments ( 31 ) have a length (W 2 −W 1 )/2 ranging from 0.05 to 1 μm. 
     
     
         21 . A composition according to  claim 19 , wherein the ratio Ra of the width W 2  to the thickness (W 2 −W 1 )/2 is at least 3. 
     
     
         22 . A composition according to  claim 21 , wherein the ratio Ra of the width W 2  to the thickness (W 2 −W 1 )/2 is greater than 5. 
     
     
         23 . A composition according to  claim 22 , wherein the ratio Ra of the width W 2  to the thickness (W 2 −W 1 )/2 is greater than 10. 
     
     
         24 . A composition according to  claim 23 , wherein the ratio Ra of the width W 2  to the thickness (W 2 −W 1 )/2 is greater than 20. 
     
     
         25 . A composition according to  claim 1 , wherein the amount of portions of hollow spheres represents from 0.5% to 10% of the total weight of the composition. 
     
     
         26 . A composition according to  claim 1 , wherein said composition is in the form of an O/W emulsion. 
     
     
         27 . A composition according to  claim 1 , further comprising at least one volatile oil. 
     
     
         28 . A composition according to  claim 27 , wherein the volatile oil is selected from the group consisting of: cyclic or linear silicones containing from 2 to 6 silicon atoms, branched hydrocarbons, volatile perfluoroalkanes, perfluoromorpholine derivatives, and mixtures thereof. 
     
     
         29 . A process for fading out skin surface defects, comprising topically applying to skin in need thereof the composition according to  claim 1 . 
     
     
         30 . The process according to  claim 29 , wherein said process is a process to reduce the sheen of the skin and/or to fade out the pores, and wherein the amount of composition applied is an amount effective to reduce the sheen of the skin and/or to fade out the pores. 
     
     
         31 . The process according to  claim 29 , wherein said process is a process to treat greasy or combination skin, and wherein the amount of composition applied is an amount effective to treat greasy or combination skin. 
     
     
         32 . The process according to  claim 30 , wherein the composition further comprises at least one active agent selected from the group consisting of:
 desquamating agents, anti-seborrhoeic agents, antimicrobial agents, calmatives and mixtures thereof.   
     
     
         33 . The process according to  claim 29 , wherein said process is a process to fade out shadows under the eyes, marks, wrinkles and/or fine lines, and wherein the amount of composition applied is an amount effective to fade out shadows under the eyes, marks, wrinkles and/or fine lines. 
     
     
         34 . The process according to  claim 29 , wherein the skin is aged skin. 
     
     
         35 . The process according to  claim 34 , wherein the composition further comprises at least one active agent selected from the group consisting of:
 desquamating agents or moisturizers; depigmenting or anti-pigmenting agents;   anti-glycation agents; anti-NO agents; agents for stimulating the synthesis of dermal or epidermal macromolecules and/or for preventing their degradation;   agents for stimulating fibroblast or keratinocyte proliferation and/or keratinocyte differentiation; muscle relaxants or dermo-decontracting agents; free-radical scavengers or anti-pollution agents; tensioning agents; and agents acting on the capillary circulation.   
     
     
         36 . The composition according to  claim 1 , wherein the composition comprises at least one surfactant. 
     
     
         37 . The composition according to  claim 27 , wherein the composition comprises at least one surfactant.