Organopolysiloxane gels for use in cosmetics
AssigneeWacker Silicones Corporation
InventorBryan E. Fry
Life of this patent
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Abstract
Organopolysiloxane gels containing gel-bound hydrophillic groups are prepared by reacting a hydrosilylatable unsaturated organopolysiloxane resin, a crosslinker bearing Si—H bound hydrogen, and a hydrosilylatable unsaturated hydrophile, in the presence of an effective amount of a hydrosilylation catalyst, at least a portion of the reaction taking place in the presence of at least 60 weight percent of an oleaginous composition containing at least 50 weight percent low viscosity organopolysiloxane. When sheared, the crosslinked organosiloxane compositions form a stable, preferably incompatible gel which may be used in turn to form a stable emulsion with large amounts of ordinarily incompatible hydrophillic liquids. The emulsions thus formed are suitable for use in a wide variety of cosmetic products.
Claims26
A stable organopolysiloxane gel which is capable of forming a stable emulsion with a hydrophilic liquid, said gel prepared by reacting a composition comprising:
- a) an organopolysiloxane resin bearing hydrosilylatable unsaturated groups;
- b) an Si—H functional organopolysiloxane crosslinker containing at least some non-terminal Si—H bound hydrogen and in excess of 5 Si—H bound hydrogens per molecule on average;
- c) an effective compatabilizing amount of hydrosilylatable unsaturated hydrophile;
- in the presence of a hydrosilylation catalyst to form a gel, at least a portion of said reacting prior to gelation taking place in the presence of an oleaginous composition containing minimally 50 weight percent based on the total weight of the oleaginous composition, of a low viscosity polyorganosiloxane.
A stable organopolysiloxane gel which is capable of forming a stable emulsion with a hydrophilic liquid, said gel prepared by reacting a composition comprising:
- a) an organopolysiloxane resin bearing hydrosilylatable unsaturated groups;
- b) an Si—H functional organopolysiloxane crosslinker containing at least some non-terminal Si—H bound hydrogen;
- c) an effective compatabilizing amount of hydrosilylatable, mono-unsaturated hydrophile;
- in the presence of a hydrosilylation catalyst to form a gel, at least a portion of said reacting prior to gelation taking place in the presence of an oleaginous composition containing minimally 50 weight percent based on the total weight of the oleaginous composition, of a low viscosity polyorganosiloxane.
A stable organopolysiloxane gel which is capable of forming a stable emulsion with a hydrophilic liquid, said gel prepared by reacting a composition comprising:
- a) an organopolysiloxane resin bearing hydrosilylatable unsaturated groups;
- b) an Si—H functional organopolysiloxane crosslinker containing at least some non-terminal Si—H bound hydrogen;
- c) an effective compatabilizing amount of hydrosilylatable unsaturated hydrophile;
- in the presence of a hydrosilylation catalyst to form a gel, said reacting taking place in the presence of 75 to 85 weight percent of a low viscosity polyorganosiloxane.
Dependencies are inferred from the claim text.