PHOSPHORUS-CONTAINING EPOXY RESIN, METHOD FOR PRODUCING THE SAME, EPOXY RESIN COMPOSITION CONTAINING THE SAME, CURED MATERIAL, AND COPPER CLAD LAMINATE

PROBLEM TO BE SOLVED: To provide a novel phosphorus-containing epoxy resin, a cured material of which exhibits excellent flame retardancy, which is obtained by epoxidation of a phosphorus-containing phenol resin by a reaction with epihalohydrins, the phosphorus-containing phenol resin having a structure where a portion of hydrogen atoms of phenolic hydroxyl groups are substituted with phosphorus-containing groups, and oxygen atoms derived from phenolic hydroxyl groups and phosphorus atoms of phosphorus-containing groups are bonded, and also to provide a method for producing the novel phosphorus-containing epoxy resin, an epoxy resin composition containing the novel phosphorus-containing epoxy resin, a cured material obtained by curing the epoxy resin composition, and a copper clad laminate having the epoxy resin composition as a matrix resin.SOLUTION: Provided is a method for producing a phosphorus-containing epoxy resin comprising reacting a phosphorus-containing phenol resin with epihalohydrins in an aprotic solvent, the phosphorus-containing phenol resin having both of a mono- or di-valent group having a phosphorus-containing group represented by a specific general formula and a mono- or di-valent group having a phenolic hydroxyl group as essential constitutional units. 【課題】一部のフェノール性水酸基の水素原子がリン含有基と置換した、フェノール性水酸基に由来する酸素原子とリン含有基のリン原子とが結合した構造を持つリン含有フェノール樹脂をエピハロヒドリン類と反応させエポキシ化して得られるリン含有エポキシ樹脂であって、硬化物が優れた難燃性を示す新規リン含有エポキシ樹脂及びこの新規リン含有エポキシ樹脂の製造方法を提供する。また、この新規リン含有エポキシ樹脂を含むエポキシ樹脂組成物、このエポキシ樹脂組成物を硬化した硬化物、並びにこのエポキシ樹脂組成物をマトリックス樹脂とする銅張り積層板を提供する。【解決手段】特定の一般式で示されるリン含有基を有する１価又は２価の基とフェノール性水酸基を有する１価又は２価の基とを共に必須の構成単位として有するリン含有フェノール樹脂と、エピハロヒドリン類とを、非プロトン性溶媒中で反応させることを特徴とするリン含有エポキシ樹脂の製造方法である。【選択図】図２