Fluorinated urethane compounds and compositions containing the same

A fluorine-containing urethane compound of the general formula:

• [Rf-A1-(X1(OD1))—(Y1)a—OC(═O)NH—]mI[—NHC(═O)O—Y2]n[—NHC(═O)O—((ClCH2—)X2O)b—R1]k (2)
• wherein I is a group remaining after an isocyanate group is removed from a polyisocyanate compound selected from the group consisting of an aliphatic polyisocyanate and an aromatic polyisocyanate,
• Rf is a perfluoroalkyl group having 2 to 21 carbon atoms,
• A1 is a direct bond or a divalent organic group having 1 to 21 carbon atoms, of the formula:
• —(CH2)p—
• —CONR11—R12—
• —CH2C(OH)HCH2—
• —CH2C(OCOR13)HCH2—, or
• —O—Ar—CH2—
• wherein R11 is hydrogen or an alkyl group having 1 to 10 carbon atoms,
• R12 is an alkylene group having 1 to 10 carbon atoms,
• R13 is hydrogen or a methyl group,
• Ar is an arylene group having 6 to 20 carbon atoms optionally having a substituent, and
• p is the number of 1 to 10
• X1 and X2 are trivalent linear or branched aliphatic group having 2 to 5 carbon atoms,
• D1 is a residue resulting from the reaction between an active hydrogen-reactive compound and active hydrogen of a hydroxyl group,
• Y1 is a divalent organic group having 0 to 5 carbon atoms and 0 to 2 nitrogen atoms (provided that at least one carbon atom or nitrogen atom is present) and at least one hydrogen atom,
• Y2 is a monovalent organic group optionally having a hydroxyl group,
• R1 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms,
• a is the number of 0 or 1,
• b 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 provided that at least one of n and k is 1 to 8, and the total of m, n and k is the number of 2 to 15.