Patent ID: 7666514

Claim:
An anti-fouling condensation curing organopolysiloxane composition comprising in admixture, (A) 100 parts by weight of a base polymer in the form of a diorganopolysiloxane having at least two silicon atom-bonded hydroxyl or hydrolyzable groups in a molecule, in which 8 to 25 mol % of entire substituent groups bonded to silicon atoms are phenyl groups, wherein said diorganopolysiloxane has a viscosity at 25° C. of 1000 to 2000 mm 2 /s, (B) 0.5 to 30 parts by weight of a silane having at least two hydrolyzable groups in a molecule and/or a partial hydrolytic condensate thereof, and (C) 5 to 100 parts by weight of a diorganopolysiloxane having the general formula (4): wherein R 2 is methyl and/or ethyl, X is an oxygen atom or a divalent hydrocarbon group of 1 to 8 carbon atoms, and the subscript n is a number such that the diorganopolysiloxane has a viscosity of 100 to 1000 at mm 2 /s at 25° C., provided that the ratio of the viscosity of component (C) to the viscosity of component (A) is in a range of 0.02 to 0.8, and (D) 5 to 100 parts by weight of hydrophilic silica having a BET specific surface area of at least 10 m 2 /g as a filler.