Core/shell particles based on silicone compounds
First Claim
1. Particle of core/shell type having a lipophilic core, wherein its shell is formed at least partly by a silicone polymer film which is the product of in situ reaction between at least one compound X and at least one compound Y, at least one of compounds X and Y being a polyorganosiloxane and said reaction being of hydrosilylation type carried out in the presence of a catalyst, condensation type carried out, if applicable, in the presence of a catalyst, or crosslinking type carried out in the presence of a peroxide.
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Abstract
The present invention relates to particles of core/shell type suitable for the encapsulation of cosmetic and/or therapeutic lipophilic active agents. It also relates to a process for preparing said particles as well as cosmetic or therapeutic compositions comprising them.
72 Citations
41 Claims
- 1. Particle of core/shell type having a lipophilic core, wherein its shell is formed at least partly by a silicone polymer film which is the product of in situ reaction between at least one compound X and at least one compound Y, at least one of compounds X and Y being a polyorganosiloxane and said reaction being of hydrosilylation type carried out in the presence of a catalyst, condensation type carried out, if applicable, in the presence of a catalyst, or crosslinking type carried out in the presence of a peroxide.
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30. Process for preparing particles of core/shell type, the core of which is lipophilic and the shell of which is formed at least partly from a silicone polymer film, comprising at least steps of:
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i. dissolving, in at least one volatile organic solvent, at least one lipophilic compound, a compound X and a compound Y, with at least one of the compounds X and Y being an organopolysiloxane and compounds X and Y being under conditions not suitable for their interaction, and ii. placing the organic phase from step 1 in contact with an aqueous phase containing, where appropriate, at least one surfactant, under conditions suitable for the formation of lipophilic droplets and for the reaction of compounds X and Y according to a reaction of hydrosilylation type in the presence of a catalyst, or of condensation or crosslinking type in the presence of a peroxide, to form a silicone polymer film at the surface of said droplets. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification