Patent ID: 7414086

Claim:
A room temperature-curable organopolysiloxane composition comprising (A) 100 parts by weight of a diorganopolysiloxane having hydroxyl groups at both ends and/or a diorganopolysiloxane having alkoxysilyl groups at both ends, (B) 0.1 to 10 parts by weight of a polyoxypropylene-modified silicone having the general formula (1), (2) or (3): wherein R is each independently a substituted or unsubstituted monovalent hydrocarbon group, Y is —R 1 —O—(C 3 H 6 O) j —H, R 1 is an alkylene group of 1 to 12 carbon atoms, k is an integer of at least 1, m is an integer of at least 1, k+m is an integer of at least 10, n is an integer of at least 4, and j is an integer of at least 5, (C) 1 to 50 parts by weight of wet silica having a water content of up to 1% by weight and prepared by using sodium silicate derived from silica sand as raw material, neutralizing an aqueous solution of sodium silicate, allowing silica to precipitate, followed by filtration and drying, or subjecting an alkoxysilane to hydrolysis reaction, said wet silica having a BET specific surface area of greater than or equal to 50 square meters per gram (m 2 /g), and (D) 1 to 20 parts by weight of a silane or siloxane having at least three hydrolyzable groups bonded to silicon atoms in a molecule.