Nippon Steel Chemical & Material Co., Ltd.

Tsugutoshi Wasano

Kazuo Ishihara

There are provided a naphthol resin and an epoxy resin that impart characteristics such as high heat resistance, a low dielectric loss tangent, and a low coefficient of thermal expansion (CTE), and an epoxy resin composition including the naphthol resin or the epoxy resin as an essential component, and cured products thereof. A naphthol resin which is represented by the following formula: where Rrepresents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and n represents the number of repetitions and is a number of 2 to 10, and in which, in terms of area ratio in GPC measurement, a ratio of components for which n=6 or more is 15% or more, and a ratio of components for which n=1 in GPC is 30% or less, and a hydroxy group equivalent is 260 to 400 g/eq.

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Tokyo, Japan

Tsugutoshi Wasano