Silicone adhesive and silicone adhesive film

摘要

A silicone adhesive comprises (A) a reaction mixture obtained by subjecting a partially condensed mixture of (i) a hydroxy-terminated diorganopolysiloxane and (ii) an organopolysiloxane copolymer having hydroxyl and alkenyl radicals and comprising R<3>3SiO1/2 units and SiO2 units, and (iii) a silicon compound having a silicon atom-bonded hydrogen atom and a silicon atom-bonded alkoxy radical to addition reaction in the presence of a platinum catalyst and (B) a crosslinking agent. The silicone adhesive exhibits at the initial a tackiness sufficient to fixedly secure a substrate. By press bonding another substrate to the adhesive-bearing substrate and heating them, the substrates can be firmly bonded together.