申请人:JSR Corporation
公开号:EP1837374A1
公开(公告)日:2007-09-26
The present invention is intended to provide a thermoplastic resin composition which is inhibited from suffering phase separation and from which an optical film having excellent transparency is readily obtained, an optical film containing the composition as a main component, a retardation film which is a film obtained by stretching the optical film and exhibits positive wavelength dependence and has a small coefficient of photoelasticity and transparency, and a process for producing the retardation film. The thermoplastic resin composition contains (A) a cycloolefin-based polymer and (B) a vinyl-based polymer having a unit represented by the following formula (II):
wherein at least one of R1 to R4 is a group represented by the formula (III), the remainder of R1 to R4, if any, and R5 and R6 are each a hydrogen atom, a halogen atom, a (substituted) hydrocarbon group which may have a linkage containing a hetero atom, or a polar group, R5 and R6 may be bonded to each other to form a monocyclic or polycyclic group which may have a hetero atom, or may be united to form a divalent hydrocarbon group, and Y is a divalent hydrocarbon group.
本发明旨在提供一种热塑性树脂组合物,该组合物能抑制相分离,并能很容易地从中获得透明度极佳的光学薄膜;一种含有该组合物作为主要成分的光学薄膜;一种通过拉伸该光学薄膜而获得的延缓膜,该膜具有正波长依赖性,并具有较小的光弹性系数和透明度;以及一种生产该延缓膜的工艺。热塑性树脂组合物包含 (A) 环烯烃基聚合物和 (B) 乙烯基聚合物,其单元由下式 (II) 表示:
其中 R1 至 R4 中至少有一个是式(III)所代表的基团,R1 至 R4 的其余部分(如果有)以及 R5 和 R6 各为氢原子、卤素原子、(取代的)烃基(该烃基可能具有含杂原子的连接)或极性基团,R5 和 R6 可相互键合形成单环或多环基团,该单环或多环基团可能具有杂原子,或可结合形成二价烃基,Y 为二价烃基。