EPOXY RESIN, CURABLE RESIN COMPOSITION AND CURED PRODUCT THEREOF, AND PRINTED WIRING SUBSTRATE

摘要

Provided is an epoxy resin which can be cured into a product that exhibits less change in heat resistance after a thermal history, and which has low thermal expandability and good solubility in solvents. An epoxy resin which is a polyglycidyl ether of a naphthol novolac resin and contains a trimer having a specific structure and a dimer having a specific structure at a predetermined ratio.