申请人:TEIJIN LIMITED
公开号:EP0980861A1
公开(公告)日:2000-02-23
The present invention provides a salicylic acid ester derivative having an impurity content lower than a specific level and expressed by the following formula (1) (in the formula, R1 is methyl group or ethyl group, R2, which may be substituted optionally, is an alkyl group having a carbon number of from 1 to 30, alkoxy group having a carbon number of from 1 to 30, aryl group having a carbon number of from 6 to 30, aryloxy group having a carbon number of from 6 to 30, aralkyl group having a carbon number of from 6 to 30 or aralkyloxy group having a carbon number of from 6 to 30). The salicylic acid ester derivative is effective as a terminal blocking agent or a polymerization promoting agent for a polycarbonate, and gives a polycarbonate having good color tone and suitable for optical material use.
本发明提供一种水杨酸酯衍生物,其杂质含量低于特定水平,用下式(1)表示(式中,R1为甲基或乙基,R2可被任选取代,为碳原子数为1至30的烷基、碳原子数为1至30的烷氧基、碳原子数为6至30的芳基、碳原子数为6至30的芳氧基、碳原子数为6至30的芳烷基、碳原子数为6至30的芳烷基)、碳原子数为 1 至 30 的烷氧基、碳原子数为 6 至 30 的芳基、碳原子数为 6 至 30 的芳氧基、碳原子数为 6 至 30 的烷基或碳原子数为 6 至 30 的烷氧基)。水杨酸酯衍生物可有效用作聚碳酸酯的末端封端剂或聚合促进剂,并可得到具有良好色调且适合光学材料使用的聚碳酸酯。