Fluorochemical urethane compounds having pendent silyl groups used for surface treatment

Abstract

Fluorochemical urethane compounds and coating compositions derived therefrom are described. The compounds and composition may be used in treating substrates, in particular substrates having a hard surface such as ceramics or glass, to render them water, oil, stain, and/or dirt repellent. The compounds have the formula (R)R—(R)]wherein Ris a fluorine-containing group, Ris the residue of a polyisocyanate. Ris of the formula —NH—CO—X—R(CHCH—S—R—Si(Y)(R))wherein Xis —O— or —NR—, where Ris H or C-Calkyl, Ris a polyvalent alkylene or arylene group, or combinations thereof, said alkylene groups optionally containing one or more catenary oxygen atoms, Ris a divalent alkylene group, said alkylene group optionally containing one or more catenary oxygen atoms, Y is a hydrolysable group, Ris a monovalent alkyl or aryl group, p is 1, 2 or 3, q is 1 to 5, x and y are each independently at least 1, and z is 1 or 2.