Patent ID: 8703880

Claim:
A curable composition comprising (A) a silane compound copolymer that includes repeating units respectively shown by formulas (i) and (ii), (i) and (iii), (ii) and (iii), or (i), (ii), and (iii), and has a weight average molecular weight of 1000 to 30,000, (B) a silane coupling agent having a reactive cyclic ether structure, and (C) a curing agent so that a mass ratio “(A):((B)+(C))” of the silane compound copolymer (A) to the silane coupling agent (B) and the curing agent (C) in total is 95:5 to 70:30, wherein R 1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, X 0 represents a halogen atom or a group shown by OG (wherein G represents a protecting group for a hydroxyl group), D represents a single bond or a linking group, and R 2 represents an alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted phenyl group.