Patent ID: 8865392

Claim:
A photosensitive resin composition comprising a photocationic polymerization initiator (A) and an epoxy resin (B) having two or more epoxy groups in one molecule, wherein the photocationic polymerization initiator (A) is a photocationic polymerization initiator (A-1) represented by the following formula (1): wherein the epoxy resin (B) is one or more selected from the group consisting of: an epoxy resin (B-1) represented by the following formula (3): (wherein R each independently represents a glycidyl group or a hydrogen atom, and at least two of a plurality of R are a glycidyl group; k represents an average value of the number of repeating units, and is a real number in the range of 0 to 30); an epoxy resin (B-2) represented by the following formula (4): (wherein R 1 , R 2 , and R 3 each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; p represents an average value of the number of repeating units, and is a real number in the range of 1 to 30); an epoxy resin (B-3) represented by the following formula (5): (wherein R 4 and R 5 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or trifluoromethyl; n and m each independently represent an average value of the number of repeating units, and are independently a real number in the range of 1 to 30); and an epoxy resin (B-6) obtained by reacting a polybasic acid anhydride with a reaction product of an epoxy compound having at least two or more epoxy groups in one molecule and a compound having at least one or more hydroxyl groups and one carboxyl group in one molecule.