Claims
- 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) an α,ω-di loweralkenyl terminated polyorganosiloxane of formula I 3having 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) a polyorganohydosiloxane of formula II 4where 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.
- 2. The silicone gel of claim 1 wherein after said polymerization, said gel is milled in the swollen stage.
- 3. The silicone gel of claim 1 wherein after said polymerization, said gel is milled in the swollen stage in a colloid mill.
- 4. The silicone gel of claim 1 wherein comprising about 3% to about 15% of said polymer and about 97% to about 85% of said medium.
- 5. The silicone gel of claim 1 which is further diluted with a diluent selected from the group consisting of low viscosity silicone oils, hydrocarbon oils, lower alkanols, and mixtures thereof.
- 6. A cosmetic formulation comprising about 65% to about 99.9% of the gel of claim 1, about 0.1% to about 30% of at least one cosmetically acceptable ingredient which cosmetic ingredient is not a low viscosity silicone oil, a hydrocarbon oil, or a lower alkanol, or mixtures thereof; and up to about 10% of a diluent selected from the group consisting of low viscosity silicone oils, hydrocarbon oils, and lower alkanols.
- 7. 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 low viscosity silicone oil, hydrocarbon oil, and a mixture thereof
(1) an α,ω-di loweralkenyl terminated polyorganosiloxane of formula I 5having a molecular weight of about 20,000 to about 25,000 with n being about 265 to about 340 and each RI being independently H, or an alkyl group of 1 or 3 carbons and
(2) a polyorganohydosiloxane of formula II 6where 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; (B) milling the result of said polymerization; 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.
- 8. The process of claim 7 wherein said polymerization takes place initially with mixing and said mixing is halted when gelling is visibly seen.
- 9. The process of claim 7 wherein said milling step takes place in a colloid mill in the swollen stage.
- 10. The process of claim 7 wherein said polymerization reaction includes a hydrosilylation reaction catalyst.
- 11. The process of claim 10 wherein said hydrosilylation catalyst is zero valent platinum divinyl complex.
- 12. The process of claim 10 wherein said polymerization reaction takes place at about 20° C. to about 50° C.
- 13. The process of claim 7 wherein said reaction is permitted to proceed for at least 2 hours.
- 14. The process of claim 7 wherein said reaction is permitted to proceed for at least 3 hours.
- 15. The process of claim 7 wherein said reaction is permitted to proceed for at least 4 hours.
- 16. The process of claim 7 wherein said polymerization reaction is permitted to take place in the substantial absence of shearing forces.
- 17. The process of claim 7 further comprising adjusting the viscosity of gel by diluting said gel with a diluent selected from the group consisting of low viscosity silicone oils, hydrocarbon oils, and lower alkanols to result in a diluted gel.
- 18. The process of claim 17 further comprising passing said diluted gel through a colloid mill.
- 19. The gel resulting from the process of claim 7.
- 20. The gel resulting from the process of claim 9.
- 21. The gel resulting from the process of claim 17.
- 22. The gel resulting from the process of claim 18.
- 23. A cosmetic composition incorporating said gel of claim 1.
- 24. A cosmetic composition incorporating the gel resulting from the process of claim 7.
- 25. A cosmetic composition incorporating the gel resulting from the process of claim 9.
- 26. A cosmetic composition incorporating the gel resulting from the process of claim 17.
- 27. A cosmetic composition incorporating the gel resulting from the process of claim 18.
- 28. The gel of claim 1 which is substantially clear.
- 29. The gel of claim 22 which is substantially clear.
- 30. A method of use of the gel of claim 1 comprising applying said gel to a rubber or rubber-like surface.
- 31. The method of claim 30 wherein said rubber or rubber-like surface is a member selected from the group consisting of tires, sealing rings, gaskets, weatherstripping, and caulking.
- 32. The method of claim 31 wherein said rubber or rubber-like surface is an automotive tire.
- 33. A composition comprising the gel of claim 1 along with components suitable for application to rubber or rubber-like surfaces.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] Priority of U.S. Provisional. Application 60/432,947, filed Dec. 11, 2002 is claimed.
Provisional Applications (1)
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Number |
Date |
Country |
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60432947 |
Dec 2002 |
US |