| abstract |
PROBLEM TO BE SOLVED: To provide a cured epoxy resin having a higher glass transition temperature, a higher strength, and a lower water absorption than a conventional epoxy resin containing a biphenyl skeleton which is supplied on the market. To provide. SOLUTION: The alkyl-substituted 4,4 represented by the following general formula (I) obtained by a method for oxidizing a substance using a biocatalyst. An epoxy resin represented by the general formula (II) obtained by subjecting 4'-biphenol to an addition reaction and a ring-closing reaction with epihalohydrin, and at least one selected from the group consisting of an acid anhydride, an organic amine and a phenol resin. An epoxy resin composition containing one type of curing agent. Embedded image Embedded image |