申请人:Kuraray Co., Ltd.
公开号:EP3564275A1
公开(公告)日:2019-11-06
A methacrylic copolymer having high thermal resistance and low water absorption and being hardly decomposed thermally is provided. The methacrylic copolymer comprises 5 to 22 % by mass of a structural unit derived from a monomer represented by formula (1) (in formula (1), R1 represents a hydrogen atom or a methyl group, R2 represents a 1C-4C alkyl group, and "n" is an integer of 1 to 3.) and 78 to 95 % by mass of a structural unit derived from a methacrylic acid ester monomer other than the monomer represented by the formula (1), and has a saturated water absorption of not more than 1.6 % by mass.
本发明提供了一种具有高耐热性和低吸水性且几乎不会热分解的甲基丙烯酸共聚物。该甲基丙烯酸共聚物包括 5%至 22%(质量百分比)的结构单元,该结构单元源自式(1)所代表的单体(式(1)中,R1 代表氢原子或甲基,R2 代表 1C-4C 烷基,"n "为 1 至 3 的整数),以及 78%至 95%(质量百分比)的结构单元,该结构单元源自除式(1)所代表的单体之外的甲基丙烯酸酯单体,其饱和吸水率不超过 1.6%(质量百分比)。