Patent ID: 8754183

Claim:
A water/oil repellent agent which comprises a reaction product of a fluorinated compound (a) with a polyisocyanate compound (b), wherein the fluorinated compound (a) is represented by the formula: R f —X-Ph-Y—Z wherein R f is a C 1-6 polyfluoroalkyl group, X is a single bond, a C 1-4 alkylene group, (CH 2 ) m (CH 2 ) n (each of m and n which are independent of each other, is an integer of from 0 to 4, with the proviso that m and n cannot both be zero) or (CH 2 ) p OCO (p is an integer of from 1 to 4), Ph is a phenylene group, Y is a single bond, a C 1-4 alkylene group or (CH 2 ) q O(CH 2 ) r (q is an integer of from 0 to 4, and r is an integer of from 1 to 4), and Z is OH or NHR (R is a hydrogen atom or a C 1-6 alkyl group).