Patent ID: 7728098

Claim:
A fluorochemical composition comprising: (a) a fluorinated oligomeric silane being represented by the general formula: X-M f n M h m M a r -G (I) wherein X represents an end group; M f represents units derived from fluorinated monomers obtainable from a condensation of a monofunctional perfluoropolyether alcohol, a polyisocyanate, and an isocyanate reactive non-fluorinated monomer; M h represents units derived from non-fluorinated monomers; M a represents units having a silyl group represented by the formula: wherein each of Y 4 , Y 5 , and Y 6 independently represents an alkyl group, an aryl group, or a hydrolyzable group and at least one of Y 4 , Y 5 , and Y 6 represents a hydrolyzable group; G is a monovalent organic group comprising the residue of a chain transfer agent; n represents a value of 1 to 100; m represents a value of 0 to 100; r represents a value of 0 to 100; and n+m+r is at least 2; with the proviso that at least one of the following conditions is fulfilled: (i) G is a monovalent organic group that contains a silyl group of the formula: wherein Y 1 , Y 2 , and Y 3 each independently represents an alkyl group, an aryl group or a hydrolyzable group with at least one of Y 1 , Y 2 , and Y 3 representing a hydrolyzable group; or (ii) r is at least 1; and optionally, (b) a non-fluorinated compound of an element M selected from the group consisting of Si, Ti, Zr, B, Al, Ge, V, Pb, Sn, and Zn and having at least two hydrolyzable groups per molecule; wherein said fluorinated oligomeric silane and said non-fluorinated compound, if present, are dissolved or dispersed in an organic solvent.