Patent ID: 6207717
Filing Date: 2001-03-27
Classification: A61K,A61Q,C08G,C08L

Abstract:
A method of making a vitamin enhanced silicone elastomer comprising entrapping an effective amount of a vitamin in a silicone elastomer by mixing the vitamin with the silicone elastomer, the silicone elastomer being prepared by a method comprising reacting:(A) an .dbd.Si--H containing polysiloxane of the formula R.sub.3 SiO(R'.sub.2 SiO).sub.a (R""HSiO).sub.b SiR.sub.3 or the formula (R'.sub.2 SiO).sub.a (R""HSiO).sub.b, and optionally an .dbd.Si--H containing polysiloxane of the formula HR.sub.2 SiO(R'.sub.2 SiO).sub.c SiR.sub.2 H or an .dbd.Si--H containing polysiloxane of the formula HR.sub.2 SiO(R'.sub.2 SiO).sub.a (R""HSiO).sub.b SiR.sub.2 H, where R, R', and R"" are alkyl groups with 1-6 carbon atoms, a is 0-250, b is 1-250, and c is 0-250; and(B) a mono-alkenyl polyether of the formula CH.sub.2.dbd.CH(CH.sub.2).sub.f O(CH.sub.2 CH.sub.2 O).sub.g (CH.sub.2 CH.sub.3 CHO).sub.h T, or the formula CH.sub.2.dbd.CH--Q--O(CH.sub.2 CH.sub.2 O).sub.g (CH.sub.2 CH.sub.3 CHO).sub.h T, where T is hydrogen, a C.sub.1 -C.sub.10 alkyl group, an aryl group, or a C.sub.1 -C.sub.20 acyl group; Q is a divalent linking group containing unsaturation; f is 1-6, g is 4-30; and h is zero or 1-100; in the presence of a platinum catalyst, until an .dbd.Si--H containing polysiloxane with polyether groups is formed; and reacting:(C) the .dbd.Si--H containing polysiloxane with polyether groups; and(D) an unsaturated hydrocarbon selected from the group consisting of alpha, omega-dienes of the formula CH.sub.2.dbd.CH(CH.sub.2).sub.d CH.dbd.CH.sub.2, alpha, omega-diynes of the formula CH.dbd.C(CH.sub.2).sub.e C.dbd.CH, and alpha, omega-ene-ynes of the formula CH.sub.2.dbd.CH(CH.sub.2).sub.e C.dbd.CH, where d and e are 1-20; in the presence of(E) an oil selected from the group consisting of (i) organic compounds, (ii) compounds containing a silicon atom, (iii) mixtures of organic compounds, (iv) mixtures of compounds containing a silicon atom, and (v) mixtures of organic compounds and compounds containing a silicon atom; and in the presence of a platinum catalyst, until a silicone elastomer is formed by crosslinking and addition of .dbd.SiH across double or triple bonds in the unsaturated hydrocarbon; the equivalent ratio of the .dbd.SiH in the .dbd.SiH containing polysiloxane with polyether groups and the unsaturated hydrocarbon being 2:1 to 1:2.