Patent ID: 7601428

Claim:
A fluorine-containing organopolysiloxane represented by the following average compositional formula (1) (Z 2 Q) β Rf(QZ 1 A α ) 2−β (1) wherein Rf is a divalent group containing a perfluoroether residue, Q is a divalent organic group, Z 1 is a di- to nona-valent organopolysiloxane residue and may contain a silalkylene bond, α is an integer of from 1 to 8, β is a number larger than 0 and smaller than 2, Z 2 is a monovalent group represented by the following formula (2) wherein b is an integer of from 1 to 10, R 1 may be the same with and different from each other and is an alkyl group having 1 to 4 carbon atoms or a phenyl group, and A is a monovalent group represented by the following formula (3) wherein R 2 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, X is a hydrolyzable group, a is 2 or 3, and c is an integer of from 1 to 6.