abstract |
(57) [Problem] To provide a naphthol resin or an epoxy resin whose cured product is excellent in heat resistance and water resistance. SOLUTION: A naphthol resin obtained by reacting a product obtained by reacting a β-naphthol with a formaldehyde generating substance and a phenol in the presence of an acid catalyst, wherein a hydroxyl group in the resin is obtained. Epoxy resin obtained by glycidyl etherification. |