Patent ID: 6107419
Filing Date: 2000-08-22
Classification: C08G,Y10S

Abstract:
A process for the preparation of a high molecular weight epoxy resin having a weight average molecular weight of not less than 40,000 and an epoxy equivalent of not more than 10,000 g/eq and a molecular weight distribution (Mw/Mn) of <4, by thermally polymerizing an epoxy resin (A) and a divalent phenol (B) in a reaction solvent in the presence of a catalyst, wherein the catalyst is a salt of quaternary ammonium or an alkali metal compound and the mixing ratio by equivalent of said epoxy resin (A) with respect to said divalent phenol (B) is 1.10 to 1.03:1 based on an epoxy group/a phenolic hydroxyl group.