Wholly aromatic polyester capable of forming an anisotropic melt phase at an advantageously reduced temperature
申请人:CELANESE CORPORATION
公开号:EP0067618A2
公开(公告)日:1982-12-22
An improved wholly aromatic polyester is provided which exhibits an anisotropic melt phase and which is capable of readily undergoing melt processing. The wholly aromatic polyester consists essentially of the recurring units (a) p-oxybenzoyl moiety, (b) 2,6-dioxynaphthalene moiety, (c) 2,6-dioxyanthraquinone moiety and (d) terephthaloyl moiety in the concentrations indicated. The resulting polymer is substantially free of aromatic rings possessing ring substitution and meta disposed linkages in the polymer chain. The present invention represents an improvement over the polyester of U.S. Patent No. 4,184,996 since the melt phase may be formed at an advantageously reduced temperature, thereby better facilitating the use of standard melt processing equipment when forming fibres, films, three-dimensional shaped articles, etc. The reduction in possible melt processing temperature is accomplished without any significant diminution in melt anisotropy such as that which would result if non-symmetrical meta disposed linkages were present in the polymer chain. Also, the present polyester does not rely upon the presence of ring substitution as a means for producing the desired melt anisotropy.
本发明提供了一种改进的全芳香族聚酯,该聚酯具有各向异性的熔融相,并易于进行熔融加工。这种全芳香族聚酯主要由以下重复单元组成:(a) 对氧苯甲酰基;(b) 2,6-二氧萘基;(c) 2,6-二氧蒽醌基;(d) 对苯二甲酰基,其浓度如图所示。所得聚合物基本上不含芳香环,在聚合物链中具有环置换和元置换连接。本发明是对美国专利第 4,184,996 号聚酯的改进,因为熔融相可以在较低的温度下有利地形成,从而在形成纤维、薄膜、三维形状物品等时更有利于使用标准熔融加工设备。在降低熔融加工温度的同时,熔体的各向异性也不会明显降低,例如,如果聚合物链中存在非对称的偏置链节,熔体的各向异性就会明显降低。此外,本聚酯并不依赖于环取代的存在来产生所需的熔体各向异性。