Silicone-based coating composition for surface-releasing film

Claim 1

A silicone-based surface-releasing coating composition which comprises, as uniformly mixed together: (a) 100 parts by weight of an organopolysiloxane of which from 0.1 to 5% in number of the organic groups bonded to the silicon atoms are alkenyl groups, the remainder of the organic groups being monovalent hydrocarbon groups free from aliphatic unsaturation; (b) from 0.1 to 10 parts by weight of an organohydrogenpolysiloxane having, in a molecule, at least three hydrogen atoms directly bonded to the silicon atoms; (c) from 0.1 to 1.0 part by weight of a salt of a metal selected from the class consisting of metals belonging to the First, Second and Eighth Groups in the Periodic Table; (d) from 0.1 to 10 parts by weight of an organopolysiloxane represented by the general formula R.sup.1.sub.a R.sup.2.sub.3-a Si--O--SiR.sup.1 R.sup.2).sub.p)O--SiR.sup.2.sub.2).sub.q O--SiR.sup.1.sub.b R.sup.2.sub.3 -b, in which R 2 is a monovalent hydrocarbon group, the subscripts a and b are each zero, 1, 2 or 3, the subscripts p and q are each zero or a positive integer not exceeding 100, the total of p+q being not exceeding 100, with the proviso that a+b+p is at least 1, and R 1 is a group represented by the formula HO(CH.sub.2 CH.sub.2 O).sub.n CH.sub.2 CH.sub.2 CH.sub.2 --, n being a positive integer not exceeding 9; and (e) a catalytic amount of a platinum compound.