Fluorocarbon siloxane compositions

Claim 1

A curable composition consisting essentially of a homogeneous mixture of (A) a siloxane polymer or copolymer of the formula ##STR20## (B) a curing agent of the formula ##STR21## (C) an effective amount of a platinum-containing catalyst; where, in (A) and (B), each R and R' is independently methyl, phenyl, or 3,3,3-trifluoropropyl, each R f is independently a perfluoroalkylene radical of 2 to 10 carbon atoms, a perfluorocycloalkylene radical, or a perfluoroalkylene radical of 2 to 10 carbon atoms or a perfluorocycloalkylene radical containing one or more --C--O--C-- linkages; p has a value of 0 to 2q inclusive, so that, when p = 0, siloxane (A) is a siloxane polymer, but when p has a value of from greater than 0 to q, inclusive, siloxane (A) can be either a random copolymer or an alternating copolymer and when p has a value of from greater than q to 2q, inclusive, siloxane (A) is only an alternating copolymer having no more than 2 adjacent CH 3 (CF 3 CH 2 CH 2 )SiO units, q has an average value of at least 5, each n is independently 1, 2, or 3, there being an average of greater than 2.0 silicon-bonded hydrogen atoms per molecule of (B) and the amount of (B) being such that there is, in said curable composition, from 0.5 to 3.0 silicon-bonded hydrogen atoms for every silicon-bonded vinyl radical.