A wholly aromatic polyester composition comprising
(a) 100 parts by weight of a wholly aromatic polyester containing as a main component at least one compound selected from the group consisting of aromatic dicarboxylic acids, aromatic dihydroxy compounds and aromatic hydroxycarboxylic acids, and
(b) from 5 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the wholly aromatic polyester and having a boiling point of at least about 200°C under atmospheric pressure and a molecular weight of not more than 1.000.
The wholly aromatic polyester composition is produced advantageously by polycondensing in the molten state the polyester-forming starting mixture in the presence of the low-molecular-weight compound.
A film-like or fibrous article of a wholly aromatic polyester may be produced by extracting the low-molecular-weight compound from a film-like or fibrous article of the wholly aromatic polyester composition.
全芳香族聚酯组合物,包括
(a) 100 份(按重量计)全芳香族聚酯,其主要成分含有至少一种选自芳香族二
羧酸、芳香族二羟基化合物和芳香族羟基
羧酸的化合物,以及
(b) 5 至 300 重量份的低分子量化合物,该化合物与全芳香族聚酯基本不发生 反应,在常压下沸点至少约为 200℃,分子量不超过 1.000。
全芳香族聚酯组合物的有利生产方法是在低分子量化合物存在下,在熔融状态下对聚酯形成起始混合物进行缩聚。
全芳香族聚酯的薄膜状或纤维状制品可通过从全芳香族聚酯组合物的薄膜状或纤维状制品中提取低分子量化合物而制成。