Patent ID: 7794843

Claim:
An organopolysiloxane represented by the following general formula (A), (B) or (C) Si n R 1 2n+2 O n−1 (A) Si n R 1 2n O n (B) Si n R 1 2n+2 R 2 k O n−k−1 (C) wherein R 1 may be the same with or different from each other and is a hydrogen atom or a monovalent organic group, R 2 is an alkylene group having 2 to 6 carbon atoms, n is an integer of from 2 to 40 and k is an integer of 1 to 3, the formula (C) represents an organopolysiloxane containing a Si—R 2 —Si bond, characterized in that at least two R 1 's are groups represented by the following formula (i): wherein X is a hydrolyzable group, R 3 is an alkyl group having 1 to 4 carbon atoms or a phenyl group, y is an integer of from 1 to 5 and a is 2 or 3; and one SiOSi bond is replaced with a bond represented by the following formula (iii): SiQR f 2 QSi (iii) wherein R f 2 is a divalent group containing a perfluoroether residue, and Q is a divalent organic group.