Cross-linked silicone gels; products containing the same; and methods of manufacture thereof
First Claim
1. A cross-linked silicone gel substantially free of SiO2 groups, substantially free of SiO1.5 groups, and substantially free of polyalkyleneoxide groups, comprising a cross-linked polymerization product of(A) (i) an α
- ,ω
-di loweralkenyl terminated polyorganosiloxane of formula I
having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each R1 being independently H, or an alkyl group of 1 or 3 carbons and (ii) optionally an α
,ω
-di ethylene terminated polydiphenyldimethylorganosiloxane; and
(B) a polyorganohydosiloxane of formula II
where the molecular weight of reactant II is about 3500 to 4000;
q is about 5 to about 9;
p is about 40 to about 50, and each R2 is independently an alkyl of 1-3 carbon atoms;
said polymerization product being polymerized in the presence of a medium selected from the group consisting of hydrocarbon oils, and mixtures thereof; and
(C) said medium wherein said polymerization takes place initially with mixing and said mixing is halted when gelling is visibly seen.
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Accused Products
Abstract
A polymerization product of an polyorganohydrosiloxane having a molecular weight of about 3500 to about 4000 and 6-7 Si—H bonds per molecule with a lower alkylene terminated polydimethylsiloxane having a molecular weight of about 20,000 to about 25,000 in the presence of a medium selected from low viscosity silicone oils, hydrocarbon oils typically with the aid of a hydrosilylation catalyst, where the amounts of the siloxanes are chosen such that the reaction product constitutes about 3% to about 15% of the cross-linked polymer and about 97 to about 85% of the reaction medium. The resultant gel is milled in a colloid mill, and if desired, diluted to a concentration of about 3% to about 8% with a diluent selected from the group consisting of low viscosity silicone oil, hydrocarbon oil, lower alkanol, or mixtures thereof. The so produced gel is useable as is or can be formulated into more complex cosmetic formulations having about 65% to about 99.9% of the gel, about 0.1% to about 30% of other non-diluent cosmetic materials (materials that are not low viscosity silicone oil, hydrocarbon oil, or lower alkanol), and up to about 5% lower alkanol.
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Citations
48 Claims
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1. A cross-linked silicone gel substantially free of SiO2 groups, substantially free of SiO1.5 groups, and substantially free of polyalkyleneoxide groups, comprising a cross-linked polymerization product of
(A) (i) an α - ,ω
-di loweralkenyl terminated polyorganosiloxane of formula I
having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each R1 being independently H, or an alkyl group of 1 or 3 carbons and(ii) optionally an α
,ω
-di ethylene terminated polydiphenyldimethylorganosiloxane; and
(B) a polyorganohydosiloxane of formula II
where the molecular weight of reactant II is about 3500 to 4000;
q is about 5 to about 9;
p is about 40 to about 50, and each R2 is independently an alkyl of 1-3 carbon atoms;
said polymerization product being polymerized in the presence of a medium selected from the group consisting of hydrocarbon oils, and mixtures thereof; and
(C) said medium wherein said polymerization takes place initially with mixing and said mixing is halted when gelling is visibly seen. - View Dependent Claims (2, 3, 4, 5, 6, 21, 26, 28, 29, 30, 31)
- ,ω
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7. A method of making a clear silicone gel comprising
(A) (i) polymerizing in the presence of a hydrosilylation polymerization catalyst and a medium selected from the group consisting of hydrocarbon oils, and mixtures thereof (1) an α - ,ω
-di lower alkenyl terminated polyorganosiloxane of formula I
having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each R1 being independently H, or an alkyl group of 1 or 3 carbons and(ii) optionally an α
,ω
-di ethylene terminated polydiphenyldimethylorganosiloxane and(2) a polyorganohydrosiloxane of formula II
where the molecular weight of reactant II is about 3500 to 4000;
q is about 5 to about 9;
p is about 40 to about 50; and
each R2 is independently an alkyl having 1-3 carbon atoms resulting in a swollen gel;
(B) milling said swollen gel; and
(C) optionally diluting the result of step (B) with a diluent selected from the group consisting of low viscosity silicone oils, hydrocarbon oils, and lower alkanols;
wherein said polymerization takes place initially with mixing and said mixing is halted when gelling is visibly seen. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 27)
- ,ω
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32. A cross-linked silicone gel substantially free of SiO2 groups, substantially free of SiO1.5 groups, and substantially free of polyalkyleneoxide groups, comprising a cross-linked polymerization product of
(A) (i) an α - ,ω
-di lower alkenyl terminated polyorganosiloxane of formula I
having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each R1 being independently H, or an alkyl group of 1 or 3 carbons and(ii) optionally an α
,ω
-di ethylene terminated polydiphenyldimethylorganosiloxane; and
(B) a polyorganohydrosiloxane of formula II
where the molecular weight of reactant II is about 3500 to 4000;
q is about 5 to about 9;
p is about 40 to about 50, and each R2 is independently an alkyl of 1-3 carbon atoms;
said polymerization product being polymerized in the presence of a medium selected from the group consisting of hydrocarbon oils, and mixtures thereof, and (C) said medium wherein said polymerization reaction is permitted to take place in a manner in which a substantial portion of the reaction mass is not subject to substantial shearing forces. - View Dependent Claims (34)
- ,ω
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33. A method of making a clear silicone gel comprising
(A) polymerizing in the presence of a hydrosilylation polymerization catalyst and a medium selected from the group consisting of hydrocarbon oils, and mixtures thereof (1) (a) an α - ,ω
-di lower alkenyl terminated polyorganosiloxafle of formula I
having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each R1 being independently H, or an alkyl group of 1 or 3 carbons and(b) optionally an α
,ω
-di ethylene terminated polydiphenyldimethylorganosiloxane; and
(2) a polyorganohydrosiloxane of formula II
where the molecular weight of reactant II is about 3500 to 4000;
q is about 5 to about 9;
p is about 40 to about 50; and
each R2 is independently an alkyl having 1-3 carbon atoms resulting in a swollen gel;
(B) milling said swollen gel; and
(C) optionally diluting the result of step (B) with a diluent selected from the group consisting of low viscosity silicone oils, hydrocarbon oils, and lower alkanols;
wherein said polymerization reaction is pennitted to take place in a manner in which a substantial portion of the reaction mass is not subject to substantial shearing forces. - View Dependent Claims (35)
- ,ω
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36. A cross-linked silicone gel substantially free of SiO2 groups, substantially free of SiO1.5 groups, and substantially free of polyalkyleneoxide groups, comprising a cross-linked polymerization product of
(A) (1) an α - ,ω
-di lower alkenyl terminated polyorganosiloxane of formula I
having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each R1 being independently H, or an alkyl group of 1 or 3 carbons;
(2) a member selected from the group consisting of mono-α
-olefin, a polyalkoxylated mono-α
-olefin, hydroxyl-terminated-α
-olefin, and mixtures thereof; and
(3) optionally an α
,ω
-di ethylene terminated polydiphenyldimethylorganosiloxane and(B) a polyorganohydrosiloxane of formula II
where the molecular weight of reactant II is about 3500 to 4000;
q is about 5 to about 9;
p is about 40 to about 50, and each R2 is independently an alkyl of 1-3 carbon atoms;
said polymerization product being polymerized in the presence of a medium selected from the group consisting of low viscosity silicone oils;
hydrocarbon oils, and mixtures thereof; and
(C) said medium wherein (1) said polymerization takes place initially with mixing and said mixing is halted when gelling is visibly seen or (2) said polymerization reaction is permitted to take place in a manner in which a substantial portion of the reaction mass is not subject to substantial shearing forces. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
- ,ω
Specification