| abstract |
A curable composition having a reactive silicon group having low viscosity, good workability during construction, good stretched physical properties of the cured product, no stickiness, and repeated stretch durability. SOLUTION: A polymer (A) having two main chain end groups in one molecule and having a linear structure, and a polymer having a branched structure having three or more main chain end groups in one molecule. The polymer (B) is contained, the main chain end groups of both polymers have a group represented by the following formula (1), and the molecular weight per main chain end group of both polymers is 2,000 or more. Yes, a curable composition satisfying the following formula (2). -SiX a R 3-a (1) In the formula, R is a monovalent organic group having 1 to 20 carbon atoms, and represents an organic group other than a hydrolyzable group, and X is a hydroxyl group or a hydrolysis group. Represents a sex group. a is an integer of 1 to 3. When a is 2 or more, X may be mutually the same or different. [2 × (molecular weight per main chain end group of polymer (A))]-(molecular weight per main chain end group of polymer (B)) ≦ 7,500 (2) [Selection figure] None |