Patent ID: 7049375

Claim:
An addition curing silicone rubber composition having a surface adhesive property, consisting essentially of: (A) 10 to 75 parts by weight of an organopolysiloxane containing at least two silicon atom-bonded alkenyl groups in a molecule, (B) 20 to 70 parts by weight of a resinous copolymer being a solid at 25° C. and composed mainly of R 3 SiO 1/2 units and SiO 2 units in a molar ratio between 0.5/1 and 1.5/1 wherein R is a substituted or unsubstituted monovalent hydrocarbon group, with the proviso that R is free of alkenyl groups or if any, the total content of alkenyl groups is less than 0.0001 mol/g, (C) 5 to 50 parts by weight of a resinous copolymer composed mainly of R′ 3 SiO 1/2 units and SiO 2 units in a molar ratio between 0.5/1 and 1.5/1 wherein R′ is a substituted or unsubstituted monovalent hydrocarbon group and includes an alkenyl group, and the total content of alkenyl groups is at least 0.0001 mol/g, (D) 0.5 to 30 parts by weight per 100 parts by weight of components (A), (B) and (C) combined of an organohydrogenpolysiloxane containing at least two silicon atom-bonded hydrogen atoms in a molecule, and (E) a catalytic amount of an addition reaction catalyst, said silicone rubber composition curing into a rubber sheet which is transparent and has a total light transmittance of at least 85% at a thickness of 10 mm.