Patent ID: 7094829

Claim:
A fluorochemical composition having oil- and/or water-repellent properties on fibrous substrates comprising a fluorinated polymer comprising units derived from (i) a mixture of two or more fluorinated polyether monomers that differ in at least their molecular weight with at least one of said monomers in an amount of at least 90% by weight of said mixture and consisting of fluorinated polyether monomers of the formula: PF-Q-C(R)═CH 2 (I) wherein PF is a perfluorinated polyether group having a molecular weight of at least 750 g/mol, R is hydrogen or alkyl of 1 to 4 carbon atoms and Q is a divalent linking group selected from the group consisting of: *—CH 2 -L 1 -, *—COO-L 2 -, *—CONR a -L 2 -, wherein L 1 is a chemical bond or an organic divalent linking group, L 2 is an organic divalent linking group and R a is hydrogen or an alkyl group having 1 to 4 carbon atoms and * indicates the position where the linking group is attached to the group PF in formula (I), and (ii) one or more units derived from one or more co-monomers other than a fluorinated polyether monomer and wherein said co-monomers comprise at least one non-fluorinated monomer.