| 摘要 |
PURPOSE:A composition that is composed of 2 kinds of organopolysiloxanes and an addition reaction catalyst, thus freeing from unsatisfactory curing, being curable at room temperature even in the form of a one-pack type, good at curing in deep parts, promoted in curing by heating and having a combination of addition reaction and condensation reaction. CONSTITUTION:The objective composition is obtained by using (A) an organosiloxane bearing at least 2 alkenyl groups and at least 2 alkoxy groups in its molecule, (B) another organosiloxane bearing at least 2 hydrogen atoms directly binding with silicon atoms in the molecule and (C) an addition reaction catalyst of platinum, palladium or rhodium. The component A is obtained partial dealcoholation reaction between an organopolysiloxane with hydroxyls on both chain ends and an alkoxysilane bearing alkenyl groups, having a straight chain, and a viscosity of 20-200,000cp at 25 deg.C. The component B has preferably a viscosity of 1-1,000cp at 25 deg.C.
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