Room temperature-curable organopolysiloxane composition

Claim 1

A room temperature-curable organopolsiloxane composition which comprises: (A) a combination of (A-1) 100 parts by weight of a diorganopolysiloxane of which each of the silicon atoms at the molecular chain ends has a silanolic hydroxy group or two alkoxy groups directly bonded thereto, (A-2) from 1 to 400 parts by weight of a filler, (A-3) from 0.1 to 5 parts by weight of an alkenyloxy silane compound represented by the general formula R.sup.1.sub.n Si.sup.X.sub.4-n, in which R 1 is a substituted or unsubstituted monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, propyl, vinyl, phenyl and 3,3,3-trifluoropropyl groups, X is an alkenyloxy group represented by the general formula --O--C(CH.sub.2 R.sup.3)=CHR.sup.2 R 2 and R 3 each being a hydrogen atom or an alkyl group selected from the class consisting of methyl, ethyl and propyl groups, and the subscript n is zero or 1, or a partial hydrolyzate thereof, (A-4) from 0.01 to 10 parts by weight of an organosilane or organopolysiloxane compound having, in a molecule, at least one substituted or unsubstituted guanidino group represented by the general formula --N═C(NR.sup.4.sub.2).sub.2, in which R 4 is a hydrogen atom or a monovalent hydrocarbon group, and (A-5) an alcohol compound represented by the general formula R.sup.5 OH, in which R 5 is a monovalent hydrocarbon group, in an amount from equimolar to 20 times by moles of the groups denoted by X in the component (A-3); (B) an organosilane or organopolysiloxane compound having, in a molecule, at least one hydrogen atom di-rectly bonded to the silicon atom in an amount from 0.3 to 1.0 mole per mole of the alcohol compound as the component (A-5); and (C) an organic tin compound in an amount in the range from 0.01 to 10% by weight based on the overall amount of the components (A-1) to (A-5).