NOVOLAK TYPE RESIN, METHOD FOR PRODUCING THE SAME, EPOXY RESIN COMPOSITION AND ITS CURED MATERIAL

摘要

PROBLEM TO BE SOLVED: To obtain an epoxy resin curing agent causing a low melt viscosity and high heat resistance of its cured material and to provide a method for efficiently producing the epoxy resin curing agent.;SOLUTION: This novolak type resin is obtained by dissolving resorcinol in an alcohol, subjecting resorcinol and formaldehyde to a condensation reaction in the presence of an acid and distilling away the alcohol and the acid as they are after the completion the reaction.;COPYRIGHT: (C)2001,JPO