To obtain an addition-curable silicone composition or a dehydrogenation-curable expandable silicone composition which exhibits not only good storability and curability but also excellent mechanical strength, adhesion, heat resistance and the like by compounding a specific organopolysiloxane, an organohydrogenpolysiloxane, a platinum group metal- based catalyst and a clay.
An organopolysiloxane (A) contains at least two alkenyl groups or at least two hydroxyl groups in the molecule. An organohydrogenpolysiloxane (B) contains at least two, preferably at least three, SiH groups in one molecule. The amount of the component B employed is such that the content of SiH groups is about 0.4-20 mole based on the total of the alkenyl groups and the hydroxyl groups in the composition. Clay is not particularly limited and there can be exemplified acid hydrous clay, neutral hydrous clay, simple baked clay, and the like. The amount of clay compounded is usually around 0.01-200 pts.wt., based on 100 pts.wt. of the component A.
TANAKA KOICHI
KOZAI TOSHIYUKI
MIYAKE MASATOSHI
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