申请人:The Dow Chemical Company
公开号:US05037938A1
公开(公告)日:1991-08-06
The invention relates to a class of polyesters and copolyesters which display optical anisotropy in the molten state and to the shaped articles, fibers and films obtained from the optically anisotropic melts. The copolyesters consisting essentially of recurring structural units (a) independently each occurrence selected from the group consisting essentially of Formula I; recurring structural units (b) independently each occurrence selected from the group consisting of Formulas II and III; recurring structural units (c) independently each occurrence selected from the group consisting of Formula IV and optionally recurring structural units (d) independently each occurrence selected from the group consisting of Formula V: ##STR1## wherein R independently each occurrence is selected from the group consisting of hydrogen, halo, lower alkyl, methoxy and phenyl; R' independently each occurrence is selected from the group consisting of hydrogen, halo, methoxy and phenyl; and R" comprises lower alkyl.
本发明涉及一类聚酯和共聚酯,其在熔融状态下表现出光学各向异性,并且涉及从光学各向异性熔体中获得的成型件、纤维和薄膜。所述共聚酯主要由重复结构单元(a)、重复结构单元(b)、重复结构单元(c)和可选的重复结构单元(d)组成,其中重复结构单元(a)独立地每次从公式I组成的基团组中选择;重复结构单元(b)独立地每次从公式II和III组成的基团组中选择;重复结构单元(c)独立地每次从公式IV组成的基团组中选择;可选的重复结构单元(d)独立地每次从公式V组成的基团组中选择:##STR1## 其中R独立地每次从氢、卤素、低级烷基、甲氧基和苯基组成的基团组中选择;R'独立地每次从氢、卤素、甲氧基和苯基组成的基团组中选择;R"包括低级烷基。