. . . . " 1 to about 100; c) organopolysiloxane III of the general formula A(Si[R1]2O)x(Si[R1][E]O)y(Si[R1][G]O)zSi(R1)2A wherein each R1 is, independently, an alkyl group of from 1 to 4 carbon atoms, E is a monovalent organic group containing at least one epoxy group, G is an B(R2)bO(C2H4O)c(C3H6O)dR3 group in which R2 is a divalent organic group, R3 is hydrogen or a monovalent hydrocarbon group, acyl gro" .