Patent ID: 7994262

Claim:
A curable composition which comprises an organic polymer (A) containing reactive silyl groups represented by the general formula (1) given below wherein a is 3 and an organic polymer (B) containing an average of 0.5 to 1.0 reactive silyl groups represented by the general formula (1) given below per molecule; —Si(R 1 3-a )X a (1) wherein R 1 represents an alkyl group containing 1 to 20 carbon atoms, an aryl group containing 6 to 20 carbon atoms, an aralkyl group containing 7 to 20 carbon atoms or a triorganosiloxy group represented by (R′) 3 SiO— (in which the three R′ groups may be the same or different and each represents a monovalent hydrocarbon group containing 1 to 20 carbon atoms) and, when there are two or more R 1 groups, they may be the same or different, and X represents a hydroxyl group or a hydrolysable group and, when there are two or more X groups, they may be the same or different, and a represents 1, 2 or 3, and wherein the main chain of each of the organic polymers (A) and (B) is an oxyalkylene polymer, and the molecular weight of the organic polymer (B) is lower than the molecular weight of the organic polymer (A) by not less than 3,000, the organic polymer (B) contains no urethane bond or urea bond with in the molecule, and wherein the curable composition contains no organic polymer that has a vinyl polymer as a main chain skeleton.