SOLVENTLESS THERMOSETTING COMPOSITION WHICH IS LIQUID AT ORDINARY TEMPERATURE AND PRODUCTION METHOD THEREOF

To provide a solventless thermosetting composition which is liquid at ordinary temperature and gives a cured product having excellent heat resistance.SOLUTION: A bisphenol-A type cyanate resin which is solid at ordinary temperature is heat-melted to obtain a molten liquid. To this molten liquid is added and mixed trimethylolpropane diallyl ether which is liquid at ordinary temperature to obtain a liquid mixture. To this liquid mixture is added and mixed P-d type benzoxazine which is solid at ordinary temperature and the P-d type benzoxazine is melted, Thereafter, the mixture is cooled to room temperature to obtain a solventless thermosetting composition which is liquid at ordinary temperature and in which a reaction product of a polyfunctional cyanate compound and a hydroxyl group-containing compound, a polyfunctional cyanate compound, and a benzoxazine ring-containing compound are compatibilized. By using, as the molten liquid, a material obtained by heat-melting a bisphenol-A type cyanate resin which is solid at ordinary temperature and a polyfunctional maleimide compound which is solid at ordinary temperature, there is obtained a solventless thermosetting composition which is liquid at ordinary temperature and in which further a polyfunctional maleimide compound is compatibilized.SELECTED DRAWING: None 【課題】 耐熱性に優れた硬化物を与える、常温液状の無溶剤型熱硬化性組成物及びその製造方法を提供する。【解決手段】 常温固形のビスフェノールＡ型シアネート樹脂を加熱溶融した溶融液を得る。この溶融液中に、常温液状のトリメチロールプロパンジアリルエーテルを添加混合して混合液を得る。この混合液中に、常温固形のＰ－ｄ型ベンゾオキサジンを添加混合し、Ｐ－ｄ型ベンゾオキサジンを溶融させる。その後、常温に冷却して、多官能シアネート化合物と水酸基含有化合物との反応生成物、多官能シアネート化合物及びベンゾオキサジン環含有化合物が相溶されてなる、常温液状の無溶剤型熱硬化性組成物を得る。溶融液として、常温固形のビスフェノールＡ型シアネート樹脂及び常温固形の多官能マレイミド化合物の両者を加熱溶融したものを用いて、さらに、多官能マレイミド化合物が相溶されてなる、常温液状の無溶剤型熱硬化性組成物を得る。【選択図】 なし