Patent ID: 7425279

Claim:
Fluorochemical composition comprising a dispersion or a solution of (A) a fluorinated repellent compound, wherein said fluorinated compound comprises the reaction product of: (i) a fluorinated polyether according to the formula: R 1 f —O—[CF(CF 3 )—CF 2 O] n —CF(CF 3 )-A-Q 1 -T k wherein R 1 f represents a perfluorinated alkyl group, n is an integer of 3 to 25, A is a carbonyl group or CH 2 , Q 1 is a chemical bond or an organic divalent or trivalent linking group and T represents a functional group capable of reacting with an isocyanate and k is 1 or 2, wherein the perfluorinated polyether group has a weight average molecular weight of at least 750 g/mol to about 100,000 g/mol; (ii) an isocyanate component selected from a polyisocyanate compound that has at least 3 isocyanate groups or a mixture of polyisocyanate compounds wherein the average number of isocyanate groups per molecule is more than 2; (iii) a non-fluorinated oxime blocking agent; and (iv) optionally one or more co-reactants capable of reacting with an isocyanate group selected from the group consisting of water, monofunctional alcohols, diols and perfluoroaliphatic compounds of the formula: (R f 4 ) x -L-Y, wherein R f 4 represents a perfluoroaliphatic group having 3 to 6 carbon atoms, L represents a non-fluorinated organic divalent or multi-valent linking group, Y represents an isocyanate-reactive functional group and x is an integer of 1 to 20, and (B) a fluorochemical stain release compound.