申请人:ASAHI KASEI KABUSHIKI KAISHA
公开号:US10017627B1
公开(公告)日:2018-07-10
A methacrylic resin composition having high heat resistance, excellent birefringence, and excellent heat stability and molding processability is provided. A methacrylic resin composition comprises: a methacrylic resin including a structural unit (X) having a cyclic structure-containing main chain, the structural unit (X) being at least one type selected from the group consisting of an N-substituted maleimide monomer-derived structural unit, a glutarimide-based structural unit, and a lactone ring structural unit; and an organic phosphorous compound, wherein a glass transition temperature is more than 120° C. and 160° C. or less, a content of a phosphorus element is 10 mass ppm to 1000 mass ppm, and a ratio P3/P5 of an integral value P3 of a spectral peak assigned to trivalent phosphorus to an integral value P5 of a spectral peak assigned to pentavalent phosphorus in 31P-NMR measurement is 0.2 to 5.0.
本发明提供了一种具有高耐热性、优异的双折射性、优异的热稳定性和成型加工性的甲基丙烯酸树脂组合物。一种甲基丙烯酸树脂组合物包括:一种甲基丙烯酸树脂,包括具有含环结构主链的结构单元 (X),该结构单元 (X) 至少是从 N-取代马来酰亚胺单体衍生结构单元、戊二酰亚胺基结构单元和内酯环结构单元组成的组中选出的一种类型;以及一种有机磷化合物,其中玻璃化温度大于 120°C.在 31P-NMR 测量中,磷元素的含量为 10 质量ppm 至 1000 质量ppm,三价磷光谱峰积分值 P3 与五价磷光谱峰积分值 P5 之比 P3/P5 为 0.2 至 5.0。