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US 6,387,971 B1Granted
Silicone rubber sponge composition and silicone rubber sponge obtained therefrom
AssigneeShin-Etsu Chemical Co., Ltd.
InventorAtsushi Yaginuma
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Abstract
A silicone rubber sponge composition comprising an organopolysiloxane, finely divided silica, a blowing agent in the form of a non-cyano type organic azo compound, typically dimethyl 1,1′-azobis(1-cyclohexane carboxylate), and a curing agent is effectively blowable into a silicone rubber sponge which is safe without a need for long-term post-cure, contains uniform fine cells and has a smooth, tack-free skin layer.
Claims8
A silicone rubber sponge composition comprising
- (A) 100 parts by weight of an organopolysiloxane of the following average compositional formula (1):
- R1aSiO(4-a)/2 (1)
- wherein R1 is independently a substituted or unsubstituted monovalent hydrocarbon group and “a” is a positive number of 1.95 to 2.04,
- (B) 1 to 100 parts by weight of finely divided silica having a specific surface area of at least 50 m2/g, and
- (C) 0.01 to 50 parts by weight of an organic azo compound of the following formula (I):
- wherein R2 and R3 are independently alkylene groups, R4 and R5 are independently hydrogen or substituted or unsubstituted monovalent hydrocarbon groups.
3 more elements
Dependencies are inferred from the claim text.