| abstract |
(57) Abstract: An object of the present invention is to provide low hygroscopicity and heat resistance, And it can be economically produced with a reasonably low viscosity, when it is used as a curing agent for an epoxy resin, it rarely interferes with the filling properties of various fillers, and the epoxy resin cured product has extremely excellent water absorption, It is intended to provide a condensate capable of imparting mechanical properties, heat resistance, adhesive properties and the like. In particular, it is preferably used as a curing agent for epoxy resins for the electric and electronic industries, for sealing electronic parts, and for laminated plate materials. A novel phenol-naphthol novolac condensate obtained by a condensation reaction of phenols and naphthols with a biphenyl compound, and an epoxy resin curing agent containing the condensate. |