Curable organopolysiloxane composition having constant mould-release properties.

摘要

A mold-releasable curable organopolysiloxane composition suitable for use as a material of a matrix mold having excellent durability of mold releasability in the preparation of replicas by resin casting is disclosed. The composition comprises, in addition to the conventional ingredients including a vinyl-containing diorganopolysiloxane, an organohydrogenpolysiloxane as a crosslinking agent of the diorganopolysiloxane, a reinforcing silica filler and a platinum compound as a catalyst, a strongly alkaline compound of an alkali metal such as potassium hydroxide, potassium siliconate, lithium siliconate and the like in a limited amount.