Patent ID: 7709553

Claim:
A photo cation polymerizable resin composition comprising (A) a cation ring-opening polymerizable compound whose activation energy in ring-opening reaction at the time of addition of methyl cation is not higher than 15 kcal/mol, (B) a cation polymerizable compound wherein the cation polymerizable compound (B) in the photo cation polymerizable resin composition comprises a cation polymerizable compound (B-1) whose functional group equivalent is 700 or more and a cation polymerizable compound (B-2) whose functional group equivalent is less than 700, and (C) a photo cation polymerization initiator, wherein the cation ring-opening polymerizable compound (A) is a compound having at least one oxirane cyclic group represented by formula 1 in one molecule chain, and the cation polymerizable compound (B) is a cation polymerizable compound not containing a structure represented by formula 1: wherein R 1 and R 2 each represent a substituent containing a carbon atom which bonds to a carbon atom constituting an oxirane ring where the carbon atom in the substituent has a saturated bond or an unsaturated bond, and R 3 represents a hydrogen atom or a substituent containing a carbon atom which bonds to a carbon atom constituting an oxirane ring where the carbon atom in the substituent has a saturated bond or an unsaturated bond, and the cation ring-opening polymerizable compound (A) is 0.1 to 10.0 parts by weight and the cation polymerizable compound (B) is 90.0 to 99.9 parts by weight based on 100 parts by weight of (A) and (B) in total in the photo cation polymerizable resin composition.