Patent ID: 8002886

Claim:
A compound of the formula wherein R f is where R f 1 is a monovalent perfluoroalkyl or a perfluorooxyalkyl group where z is 1, or a divalent perfluoroalkylene or a perfluorooxyalkylene group where z is 2, Q is a covalent bond, or a polyvalent alkylene group of valency z, said alkylene optionally containing one or more catenary (in-chain) nitrogen or oxygen atoms, and optionally containing one or more sulfonamide, carboxamido, or carboxy functional groups; X 2 is —O—, —NR 4 — or —S—, where R 4 is H or C 1 -C 4 alkyl, R 1 is the residue of a polyisocyanate selected from multivalent aliphatic, alicyclic, or aromatic moiety, R 2 is of the formula: wherein X 1 is —O— or —NR 4 —, where R 4 is H or C 1 -C 4 alkyl, R 3 is a polyvalent alkylene or arylene groups, or combinations thereof, said alkylene groups optionally containing one or more catenary oxygen atoms; R 5 is a divalent alkylene group, said alkylene groups optionally containing one or more catenary oxygen atoms; Y is a hydrolysable group selected from a halogen, a C 1 -C 4 alkoxy group, or a C 1 -C 4 acyloxy group, R 6 is a monovalent alkyl or aryl group, p is 1, 2 or 3, and q is 1 to 5, x and y are each independently at least 1, and z is 1 or 2.