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US 5,183,878 AGranted
Easily processable, wholly aromatic polyester
AssigneePolyplastics Co., Ltd.
InventorsKeiichi Kanaka, Noriyuki Hayashi, Toshihiro Kobashi, Yukihiko Kageyama, Kenji Hijikata
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Abstract
An improved easily processable wholly aromatic polyester exhibiting melt anisotropy and excellent thermal stability is provided which consists essentially of the structural units (i) to (iii) wherein: ##STR1## and wherein Ar.sub.1 is 1,4-phenylene, Ar.sub.2 is 2,6-naphthalene and 2,7-naphthalene, and Ar.sub.3 is 1,4-phenylene and/or 4,4'-biphenylene.
Claims11
An easily processable wholly aromatic polyester consisting essentially of structural units represented by the formulas (i) to (iii) where:
- ##STR4## and wherein Ar.sub.1 is 1,4-phenylene;
- Ar.sub.2 is a mixture of 2,6-naphthalene and 2,7-naphthalene wherein 2,6-naphthalene is present in a concentration of 10 to 90 mole percent based upon the total concentration of 2,6-naphthalene and 2,7-naphthalene;
- and Ar.sub.3 is selected from the group consisting of 1,4-phenylene, 4,4'-biphenylene, and mixtures of these;
- and unit (ii) constitutes 10 to 90 mole percent of the units derived from a dicarboxylic acid present in said polyester.
1 more element
Dependencies are inferred from the claim text.