Abstract: An epoxy resin composition used for semiconductor encapsulating, laminated boards or electrical insulation is prepared from a thermosetting resin composition containing:
(A) an epoxy resin and
(B) a phenol resin
represented by the following general formula (1):
wherein R1 and R2 are a hydrogen atom or alkyl group having 1 to 4 carbon atoms, and R3 is an amino group, alkyl group having 1 to 4 carbon atoms, phenyl group, vinyl group or the like, and wherein m is an integer of 1 or 2.