Patent ID: 6977307

Claim:
A water soluble or water dispersible fluorochemical silane represented by the general formula: X-M f n M h m M a r -G (I) wherein X represents the residue of an initiator or hydrogen; M f represents units derived from one or more fluorinated monomers; M h represents units derived from one or more 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; G is a monovalent organic group including the residue of a chain transfer agent; n represents a value of 1 to 100; m represents a value of 0 to 100; and 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: (a) G 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 and at least one of Y 1 , Y 2 and Y 3 represents a hydrolyzable water solubilising group or (b) r is at least 1 and at least one of Y 4 , Y 5 and Y 6 represents a hydrolyzable water solubilizing group.