Room temperature curable silicon group-containing polymer composition

A room temperature curable silicon group-containing polymer composition, comprising:

• (A) a reactive silicon group-containing polymer obtained through a urethane reaction between polyoxypropylene polyol whose number average molecular weight is 500 to 50,000 and γ-isocyanate propyltrialkoxysilane, having a main chain being substantially composed of polyoxypropylene, and having a reactive silicon-containing group represented by a formula:
• (wherein the R1s are the same or different and each represents an alkyl group having 1 to 4 carbons) at an end of the main chain, and based on 100 parts by weight of said reactive silicon group-containing polymer;
• (B) 0.01 to 10 parts by weight of a curing catalyst;
• (C1) 0.05 to 25 parts by weight of amino group-substituted alkoxysilane;
• and
• (D) 1 to 500 parts by weight of heavy calcium carbonate being surface-treated with glycol that is liquid at room temperature, the glycol being at least one selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol, and 1,4-butanediol;
• wherein said (C1) amino group-substituted alkoxysilane is an alkoxysilane having an amino group-substituted alkyl group represented by the general formula:
• (R5O)3-kR6kSi—R7,
• wherein R5 and R6 are the same or different and each represents an alkyl group;
• k is an integer of 0 (zero) to 2;
• R7 represents an amino group-substituted alkyl group having a branch represented by the general formula:
• —(CH2)p—CHR8—(CH2)q—NH2 or the general formula:
• —(CH2)p—C(R8)2—(CH2)q—NH2, wherein R8 represents an alkyl group having 1 to 4 carbons, and p and q respectively represent an integer of 1 to 8, with the proviso that p+q is an integer of 9 or smaller.