Patent ID: 8703866

Claim:
A room temperature curable organopolysiloxane composition, comprising: (A) 100 parts by weight of a diorganopolysiloxane blocked with hydroxylsilyl, alkoxysilyl or alkoxyalkoxysilyl radicals at both ends of the molecular chain and represented by formula (1), said diorganopolysiloxane having a viscosity of 20 to 1,000,000 mPa-s at 25° C., wherein R 1 is hydrogen, an alkyl radical of 1 to 10 carbon atoms, or an alkoxyalkyl radical of 2 to 10 carbon atoms, R 2 is a radical of 1 to 10 carbon atoms selected from the group consisting of a monovalent hydrocarbon, a monovalent halogenated hydrocarbon, and a cyanoalkyl radical, a is 2 when R 1 is hydrogen, a is 0 or 1 when R 1 is an alkyl or alkoxyalkyl radical, Y is oxygen, a divalent hydrocarbon radical of 1 to 6 carbon atoms, or a radical of formula (2): wherein R 2 is as defined above, and Z is a divalent hydrocarbon radical of 1 to 6 carbon atoms, and n is such a number that the diorganopolysiloxane has a viscosity of 20 to 1,000,000 mPa-s at 25° C.; (B) 0.5 to 20 parts by weight of an alkoxysilane compound, a partial hydrolytic condensate thereof, or both; (C) 0.001 to 20 parts by weight of a curing catalyst; (D) 0.1 to 5 parts by weight of triacetin; and (E) 10 to 300 parts by weight of calcium carbonate.