Patent ID: 8080604

Claim:
An adhesive comprising a ladder-type polysilsesquioxane having a number average molecular weight of 1,700 to 30,000, and having a recurring unit of the following formula (I) in the molecule, wherein R 1 represents a group that includes an epoxy group or a glycidyloxy group, and R 2 represents the same group as R 1 , an alkyl group having 1 to 6 carbon atoms which may have a substituent, an alkoxy group having 1 to 6 carbon atoms which may have a substituent, or a phenyl group which may have a substituent, and the sum of the number of R 1 and the number of R 2 that includes an epoxy group or a glycidyloxy group is 50% or more of the sum of the number of R 1 and the number of R 2 , and at least one heat-curing agent selected from the group consisting of an imidazole, a pyrazole, a triazole and a triazine.