Curable silicone composition

Claim 1

A curable silicone composition, comprising: (a) an organopolysiloxane having in its molecule at least two silicon-bonded C 2 to C 8 alkenyl groups and containing in its molecule at least one substituent selected from the group consisting of silicon-bonded fluorine-containing substituents represented by Formulas (1) to (4) in an amount of 3 mole % or more of all of the silicon-bonded organic groups in the molecule: ##STR29## where n is an integer of 1 to 5, ##STR30## where n is an integer of 1 to 5, C.sub.m F.sub.2m+1 CH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 CH.sub.2 --(3) where m is an integer of 3 to 10, and C.sub.m F.sub.2m+1 CH.sub.2 OCH.sub.2 CH.sub.2 CH.sub.2 -- (4) where m is an integer of 3 to 10; (b) an organohydrogenpolysiloxane having in its molecule at least three silicon-bonded hydrogen atoms and containing in its molecule at least one substituent selected from the group consisting of silicon-bonded fluorine-containing substituents represented by said Formulas (1) to (4) and Formula (14): R.sup.5 CH.sub.2 CH.sub.2 -- (14) where R 5 represents a C 1 to C 8 perfluoroalkyl group in an amount of 3 mole % or more of all of the silicon-bonded organic groups in the molecule; and (c) a catalyst for promoting the addition reaction between said silicon-bonded alkenyl groups and said silicon-bonded hydrogen atoms; the proportion of said silicon-bonded hydrogen atoms in Component (b) to said silicon-bonded alkenyl groups in Component (a) being at least 0.5.