Room temperature-curing silicone elastomer composition
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsSeiji Hori, Hidekatsu Hatanaka, Toshio Saruyama
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Abstract
A room temperature-curing silicone elastomer composition which has excellent workability before curing and forms a silicone elastomer after curing which exhibits low modulus and high elongation. This composition contains a hydroxyl-capped polydiorganosiloxane, a siloxane chain extender of the formula R.sup.1 (R.sup.2.sub.n R.sup.3.sub.(3-n) SiO)Si(OR.sup.4).sub.2 in which R.sup.1, R.sup.2, and R.sup.3 are aliphatic monovalent hydrocarbon groups, R.sup.4 is a hydrocarbon group having from 1 to 8 carbon atoms per group, and n is 0 or 1, an alkoxysilane crosslinker, and a curing catalyst.
Claims18
A room temperature-curing silicone elastomer composition comprising
- (A) 100 parts by weight of a silanol terminated substantially straight chain polyorganosiloxane having a viscosity at 25.degree. C. of from 0.00002 to 1 m.sup.2 /s,
- (B) 0.1 to 20 parts by weight per 100 parts by weight of (A) of a siloxane expressed by the formula
- R.sup.1 (R.sup.2.sub.n R.sup.3.sub.(3-n) SiO)Si(OR.sup.4).sub.2
- in which R.sup.1, R.sup.2, and R.sup.3 are aliphatic monovalent hydrocarbon groups, R.sup.4 is a hydrocarbon group having from 1 to 8 carbon atoms per group, and n is 0 or 1,
- (C) 0.01 to 20 parts by weight per 100 parts by weight of (A) of an organosilane expressed by R.sup.5.sub.(4-a) Si(OR.sup.4).sub.a where R.sup.4 is the same as defined in (B), and R.sup.5 is a monovalent hydrocarbon group having from 1 to 20 carbon atoms per group, and a is 3 or 4, or its partially hydrolyzed product, and
- (D) 0.01 to 20 parts by weight per 100 parts by weight of (A) of a curing catalyst.
Dependencies are inferred from the claim text.