Patent ID: 7914589

Claim:
A fluorine-containing urethane compound of the formula: [Rf-A 1 -Z—X 1 —OC(═O)NH—] m I [—NHC(═O)O—Y 1 ] n [—NHC(═O)O—((ClCH 2 —)X 2 O) a —R 1 ] k (1) wherein I is a group remaining after an isocyanate group is removed from a polyisocyanate compound and the polyisocyanate compound constituting the I group is an aliphatic polyisocyanate, Rf is a perfluoroalkyl group having 1 to 21 carbon atoms, A l is a direct bond or a divalent organic group having 1 to 21 carbon atoms, Z is —SO 2 —, X 1 is a divalent linear or branched aliphatic group having 1 to 5 carbon atoms optionally having at least one hydroxyl group, X 2 is a trivalent linear or branched aliphatic group having 2 to 5 carbon atoms, Y 1 is a monovalent organic group optionally having a hydroxyl group, R 1 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, a is the number of 1 to 20, m is the number of 1 to 15, n and k are the number of 0 to 14, and the total of m, n and k is the number of 2 to 15.