Patent ID: 7750093

Claim:
A fluorochemical polyurethane compound prepared by reacting: (a) a fluorochemical spacer oligomer comprising the oligomerization product of fluorochemical spacer monomers alone or in combination with other polymerizable monomers in the presence of at least one functionalized chain transfer agent (b) a di-, tri-, or tetravalent isocyanate or combinations thereof, (c) optionally, at least one isocyanate-reactive group and/or blocking group, and, (d) optionally, at least one multi-functional chain extender; wherein the fluorochemical spacer monomers are represented by the following formula: C n F 2n+1 —X′—OC(O)NH-A″-HNC(O)O—(C p H 2p )(O)COC(R′)═CH 2 wherein n is 4; X′ is m is 2 to 4; A″ is R′ is H, CH 3 , or F; and p is 2.