Nippon Kayaku Kabushiki Kaisha

Kazuyuki Ohhashi

Masataka Nakanishi

Toru Kurihashi

Katsuhiko Oshimi

Disclosed is a phenol aralkyl epoxy resin having a structure wherein at least a phenol or a naphthol is bound by using an aralkyl group as a linking group and a structure represented by formula (1) below, while satisfying the condition 1 below. This epoxy resin is excellent in workability during production of a composition and is easy to control quality. Condition 1: The following relation (&#x3b1;) is satisfied with A being the hydroxyl equivalent (as measured in accordance with JIS K 0070) of a phenol-modified epoxy resin obtained by adding an equivalent molar amount of phenol relative to the epoxy equivalent of the epoxy resin, and B being the epoxy equivalent of the epoxy resin. 50&#x2266;1000&#xd7;(A&#x2212;B)/B&#x2266;250 (&#x3b1;). 

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Kita-ku, Japan

Kazuyuki Ohhashi