| http://www.w3.org/ns/prov#value | - In view of mechanical properties and thermal properties of the resin, particularly preferred is a resin obtained using a bifunctional epoxy resin and a bifunctional phenol which are mixed in an equivalent weight ratio of epoxy group/phenolic hydroxyl group=1/0.9 to 1/1.1, and by subjecting them to polyaddition reaction in the presence of a catalyst such as an alkali metal compound, an organic phos
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