Compositions Comprising Solid Particles Encapsulated In A Cross-Linked Silicone Matrix, And Methods Of Making The Same
First Claim
1. A topical composition comprising a dispersion of treated particles in a cosmetically or pharmaceutically acceptable carrier, wherein each of said treated particles comprises one or more core particles encapsulated in a cross-linked silicone matrix.
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Abstract
The present invention relates to topical compositions containing solid particles that are stabilized via encapsulation into a cross-linked silicone matrix. The solid particles are preferably formed of a metal oxide, such as zinc oxide or titanium dioxide, and the cross-linked silicone matrix is preferably formed by cross-linking a silicone having branched reactive alkoxyl moieties in the presence of a stannous carboxylate cross-linking agent. The stabilized particles of the present invention can readily be used either alone or in combination with other skin care actives to form topical compositions with improved stability and performance.
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Citations
16 Claims
- 1. A topical composition comprising a dispersion of treated particles in a cosmetically or pharmaceutically acceptable carrier, wherein each of said treated particles comprises one or more core particles encapsulated in a cross-linked silicone matrix.
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14. A treated particle comprising one or more titanium dioxide or zinc oxide core particles encapsulated in a cross-linked silicone matrix, wherein said treated particle has a particle size ranging from about 1 micron to about 50 microns.
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15. A method for forming treated particles, comprising:
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(a) coating core particles having an average particle size ranging from about 0.001 micron to about 0.5 micron with silicone; (b) contacting the coated particles with a cross-linking agent, wherein the cross-linking agent comprises a stannous carboxylate capable of effectuating cross-linking of the silicone coating, thereby forming a cross-linked structure with the core particles encapsulated therein; and (c) reducing the cross-linked structure into treated particles having an average particle size ranging from about 1 micron to about 50 microns, wherein each of the treated particles comprises one or more of said core particles encapsulated in a cross-linked silicone matrix. - View Dependent Claims (16)
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Specification