Coating composition comprising a polysiloxane resin-forming precondensate, a fluorocarbon polymer, an epoxy resin, a silicone fluid, and an inorganic hardening agent

Claim 1

A coating composition having a solids content of 25-80% by weight in an inert liquid carrier and comprised of: (a) a binder comprised of (1) 40-93%, based on the weight of the binder, of a polysiloxane resin-forming precondensate which has one or more of the units ##STR8## wherein X is a functional group which allows cross-linking at its site, and a, b, c, d and e are of a magnitude and in proportions which provide the resin with a degree of substitution, measured as the ratio of phenyl plus methyl groups to silicon atoms, of at least about 1.0, and a ratio of phenyl groups to silicon atoms of at least about 0.3, and which has a silanol content above 4%, based on the weight of the precondensate; (2) 5-50%, based on the weight of the binder, of a fluorocarbon polymer; and (3) 2-40%, based on the weight of the binder, of an epoxy resin having the formula ##STR9## wherein n is an integer from 0-42, and R is an alkylene group of 1-4 carbon atoms; (b) 0.2-10%, based on the weight of the binder, of a silicone fluid which is a dimethyl polysiloxane fluid having a viscosity of 50-5000 centistokes measured at 25° C.; (c) a finely divided inorganic hardening agent in a hardening agent-to-binder ratio of about 5/100 to 400/100; and (d) a inert liquid carrier.