| abstract |
A phenol aralkyl type epoxy resin having a structure in which at least phenols or naphthols are bonded with an aralkyl group as a bonding group, and a structure represented by the formula (1), and satisfying the condition 1. This epoxy resin is excellent in workability at the time of manufacturing the composition, and quality control is easy. Condition 1: A hydroxyl equivalent of a phenol-modified epoxy resin obtained by adding equimolar amount of phenol to an epoxy equivalent of an epoxy resin is A (measured according to JIS K 0070), and an epoxy equivalent of the epoxy resin is B. In this case, the relationship between the two satisfies the following relational expression (α). 150 ≦ 1000 × (B−A) / B ≦ 250 (α) |