Patent ID: 8129567

Claim:
A method of providing soil resistance to a substrate comprising contacting said substrate with a polymer containing at least one urea linkage prepared by (i) reacting (1) at least one organic diioscyanate, polyisocyanate, or mixture thereof, and (2) at least one fluorochemical compound of Formula I R f —O(CF 2 CF 2 ) r (CH 2 CH 2 ) q (R 1 ) s XH Formula I wherein R f is a linear or branched C 1 to C 7 perfluoroalkyl optionally interrupted by one to three oxygen atoms, r is 1 to 3, q is 1 to 3, s is 0 or 1, X is O, S, or NR 2 wherein R 2 is H, or C 1 to C 6 alkyl, and R 1 is the divalent radical selected from —S(CH 2 ) n —, p is 1 to 50, and R 3 , R 4 and R 5 are each independently H or C 1 to C 6 alkyl; (ii) and then reacting with (3) water, a linking agent, or a mixture thereof, provided that the diisocyanate, polyisocyanate, or mixture thereof comprises one or more cyclic diisocyanates selected from the group consisting of 2,4-toluene diisocyanate; 2,6-toluene diisocyanate; diphenylmethane 4,4′-diisocyanate; diphenylmethane 2,4′-diisocyanate; 3-isocyanatomethyl-3,4,4-trimethylcyclohexyl isocyanate; and bis-(4-isocyanatocylohexyl)methane and diisocyanate trimers of formula (IIa), (IIb):