Patent ID: 8304501

Claim:
A composition comprising a cage-type structure of silsesquioxane represented by the following formula (A) and a partially cleaved cage-type structure of silsesquioxane represented by formula (B) (R 1 SiO 3/2 ) l (A) (R 1 SiO 3/2 ) m (R 1 SiO 2 H) n (B) [wherein, in formulae (A) and (B), 1 represents an integer of 4 or more, m represents an integer of 4 or more, n represents an integer of 1 or more, and n/(1+m) is 0.03 to 0.2; each R 1 may be the same or different, and represents a group selected from a group consisting of an alkoxy group with 1 to 10 carbons, aryloxy group with 1 to 10 carbons, alkyl group with 1 to 20 carbons, alkenyl group with 2 to 20 carbons, aryl group with 6 to 20 carbons, aralkyl group with 7 to 20 carbons, silicon atom-containing group with 1 to 10 silicons, and a group having α,β-diol; wherein at least one R 1 in one molecule is a group having α, β-diol, and when there are 2 or more groups having α,β-diol, they may be the same or different].