US 2004/0176528 A1 · Room-temperature-curable silicone rubber composition

Abstract

A room-temperature-curable silicone rubber composition comprising (A) 100 parts by weight of a polydiorganosiloxan mixture comprising: (A-1) 20 to 95 wt. % of a polydiorganosiloxane having both molecular terminals capped with dialkoxysilyl groups or trialkoxysilyl groups, (A-2) 5 to 80 wt. % of a polydiorganosiloxane having a molecular terminal capped with dialkoxysilyl group or trialkoxysilyl group and the other molecular terminal capped with monoalkoxysilyl group, hydrosilyl group, trialkylsilyl group or trialkoxyalkylsilyl group, and (A-3) 0 to 30 wt. % of a polydiorganosiloxane having both molecular terminals capped with monoalkoxysilyl group, hydlosilyl group, trialkylsilyl group or trialkoxyalkylsilyl group, (B) one or more alkoxysilanes of the formula R5bSi(OR6)4-b or partial hydrolysis and condensation products thereof, and (C) an organotitanium compound. The composition is used as a sealant.

Claims15

Dependent claims

A room-temperature-curable silicone rubber composition comprising

(A) 100 parts by weight of a mixture comprising:
(A-1) 20 to 95 wt. % of a polydiorganosiloxane represented by the following general formula
33
(A-2) 5 to 80 wt. % of a polydiorganosiloxane represented by formula
34
and
(A-3) 0 to 30 wt. % of a polydiorganosiloxane represented by formula
35
where R1 and R2 are alkyl groups or alkoxyalkyl groups, R3 is selected from the group consisting of monovalent hydrocarbon group, halogenated hydrocarbon group, and cyanoalkyl group, R4 is —OSi R23, hydrogen or an alkoxy group, R7 is R2 or R3, each Y and Z is oxygen or a divalent hydrocarbon group, a is 0 or 1, q is 0, 1 or 2, and n is a number that provides the respective polyorganosiloxanes with a viscosity within the range of 20 to 1,000,000 mPa·s at 25° C.;
selected from the group compounds wherein:—
when R4 is —OSi R23, Y is oxygen or a divalent hydrocarbon group, Z is a divalent hydrocarbon group, R7 is R2 and q is 0, 1 or 2;
and
when R4 is hydrogen or an alkoxy group, Y is oxygen or a divalent hydrocarbon group, Z is oxygen or a divalent hydrocarbon group, q is 2 and R7 is R3;
(B) 1 to 25 parts by weight of one or more alkoxysilane or partial hydrolysis and condensation products thereof having the general formula
R5bSi(OR6)4-b,
where R5 is a monovalent hydrocarbon group, R6 is an alkyl group or an alkoxy alkyl group, and b is 0 or 1;
and
(C) 0.5 to 10 parts by weight of an organotitanium compound.

15 more elements

Dependencies are inferred from the claim text.

Room-temperature-curable silicone rubber composition

Life of this patent

Room-temperature-curable silicone rubber composition

Life of this patent

Abstract

Claims15