Patent ID: 7825177

Claim:
A one-pack type addition cure silicone rubber adhesive composition comprising (A) 100 parts by weight of an organopolysiloxane containing at least two silicon-bonded alkenyl groups in a molecule, represented by the average compositional formula: R 1 a R 2 b SiO (4-a-b)/2 wherein R 1 is a substituted or unsubstituted, monovalent hydrocarbon group free of aliphatic saturation, R 2 is an alkenyl group, “a” is a positive number of 0.96 to 2.00, “b” is a positive number of 0.001 to 0.5, and the sum of a+b is 1.46 to 2.1, (B) 0.5 to 400 parts by weight of an inorganic filler, (C) 0.1 to 20 parts by weight of an alkoxysilane, (D) 0.001 to 10 parts by weight of a hydrolytic catalyst selected from the group consisting of titanium compounds, zirconium compounds and aluminum compounds, (E) an organohydrogenpolysiloxane represented by the average compositional formula: R 3 c H d SiO (4-c-d)/2 wherein R 3 is a substituted or unsubstituted, monovalent hydrocarbon group free of aliphatic saturation, “c” is a positive number of 0.7 to 2.1, “d” is a positive number of 0.005 to 1.2, and the sum of c+d is 0.8 to 3.0, in such an amount as to provide a ratio of hydrosilyl groups to alkenyl groups available in the composition in the range from 0.4:1.0 to 10.0:1.0, (F) a necessary amount of a cure regulator, and (G) a platinum group metal compound in an amount to give a metal element content of 1 to 2000 ppm based on the total weight of the composition, said composition being prepared by mixing components (A) and (B) and part or all of components (C) and (D), in the absence of component (G), at a temperature of 0° C. to 200° C. and a reduced pressure to form a premix, and adding component (G) and the remaining components to the premix and mixing at a temperature of 0° C. to 60° C. and a reduced pressure.