Patent ID: 6916538

Claim:
A thermosetting resin composition which comprises: (A) an epoxy resin having at least two epoxy groups per molecule; (B) a hardener; (C) a compound represented by the following general formula (1) or (2): R 1 —(COO—CH(CH 3 )—O—R 2 ) n (1) CH 2 ═CH—O—R 4 —O—CH(CH 3 )—(OCO—R 3 —COO—CH(CH 3 )—OR 4 —O—CH(CH 3 ) n —OCO—R 3 —COO—CH(CH 3 )—OR 4 —O—CH═CH 2 (2) wherein n is a positive integer, and R 1 , R 2 , R 3 and R 4 each represent an organic group having a valence of 1 or higher and may be the same or different; and (D) a microcapsule type hardening accelerator comprising microcapsules each having a structure made up of a core comprising a hardening accelerator and a shell covering the core and comprising a polymer having a structural unit represented by the following general formula (3): —N(R 5 )—CO—N(R 6 )— (3) wherein R 5 and R 6 each represent a hydrogen atom or a monovalent organic group and may be the same or different, and which, when examined by differential scanning calorimetry at a heating rate of 10° C./min, shows an exothermic peak due to reaction in the range of from 180 to 250° C.