Patent ID: 7470741

Claim:
Fluorochemical composition comprising between about 0.05 and 50 percent by weight of the condensation product of (a), (b), (c), and (d) wherein: (a) one or more fluorochemical oligomers derivable from a free radical polymerization of one or more monovalent fluorinated monomers and optionally one or more non-fluorinated monomers in the presence of a chain transfer agent, said fluorochemical oligomer being free of acid groups and comprising one or more groups of the formula: -M 1 (R) q (Y) p−q−1 (I) wherein M 1 is Si, R represents a non-hydrolysable group, Y represents a hydrolysable group, q is 0, 1 or 2, p is 4 and p−q−1 is at least 1; and (b) one or more non-fluorinated compounds of the formula (R 2 ) i M 2 (Y 7 ) j−i (VII) wherein R 2 represents a non-hydrolysable group, M 2 is Si, j is 4, i is 0,1 or 2, and Y 7 represents a hydrolysable group and having at least two hydrolysable groups per molecule (a); wherein the weight ratio of said (a) oligomers to said (b) non-fluorinated compounds is from about 2:1 to about 1:100 (c) is crosslinking agent being a compound of an element M 3 that is selected from the group consisting of Si, Ti, Zr, B, Al, Ge, V, Pb, Sn and Zn, said crosslinking agent further having at least one hydrolysable group and at least one reactive functional group per molecule that is capable of engaging in a crosslinking reaction and (d) is sufficient water to effect hydrolysis of said hydrolysable groups; wherein said condensation product is dispersed or dissolved in (e) organic solvent selected from the group consisting of aliphatic alcohols, ketones, esters, ethers, and mixture thereof.