METHOD FOR PRODUCING NOVOLAC RESIN, AND NOVOLAC RESIN

摘要

Disclosed are a modified novolac resin having excellent moisture resistance and heat resistance, and a thermosetting resin composition wherein the modified novolac resin is blended as a curing agent.  Specifically disclosed is a novolac resin represented by formula (III), wherein the ratio of ortho-ortho-ortho bonds produced by condensing a hydrogen atom in the ortho position of a phenol represented by formula (II') and a phenol represented by formula (II'') with an aldehyde group of an orthohydroxybenzaldehyde is not less than 70% by mole of the total bonds.  Also specifically disclosed is an epoxy resin composition containing the novolac resin.