Coating of silanol-reactive surfaces with di-silyl poly(perfluorooxyalkylenes)

A porous, woven or non-woven, inert, resilient carrier impregnated with a linear poly(perfluorooxyalkylene) compound terminated on each end with a trisubstituted-silyl group hydrolyzable to a tri-hydroxysilyl group, said compound having the formula:

• R.sub.fo {--Q(CH.sub.2).sub.z Si(X).sub.3 }.sub.2
• where R.sub.fo is a divalent, linear poly(perfluorooxyalkylene) backbone structure having a number average molecular weight in the range of 500 to 10,000 and has the formula:
• --CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.m (CF.sub.2 O).sub.n --CF.sub.2 --
• where (CF.sub.2 CF.sub.2 O) and (CF.sub.2 O) are randomly distributed oxyethylene and oxymethylene repeating units, respectively, where the subscripts m and n are integers whose ratio m/n is in the range of 0.2/1 to 5/1, X is a hydrolyzable group selected from the group consisting of halo, alkoxy, and acyloxy, z is an integer of 2 to 11, and Q is a divalent organic linking group which is free of olefinic unsaturation and silanol-reactive groups.