Patent ID: 9125309
Filing Date: 2015-09-01
Classification: C08G,H05K,Y10T

Abstract:
1. An epoxy resin that is a polyglycidyl ether of a polycondensate of an α-naphthol compound, a β-naphthol compound, and formaldehyde, the epoxy resin comprising: a trimer (x1) represented by a structural formula (1) below in the formula, R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and G represents a glycidyl group; and a dimer (x2) represented by a structural formula (2) below in the formula, R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; and G represents a glycidyl group, wherein a content of the trimer (x1) is 15% to 35% in terms of area percentage in GPC measurement, and a content of the dimer (x2) is 1% to 25% in terms of area percentage in GPC measurement, further comprising a calixarene compound (x3) represented by a structural formula (3) below in the formula, R 1 and R 2 each independently represent a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms; G represents a glycidyl group; and n represents a number of the repeating unit and an integer of 2 to 10, wherein a content of the calixarene compound (x3) in the epoxy resin is 1% to 40% in terms of area percentage in GPC measurement.