Polyester of 2,6-naphthalene dicarboxylic acid, 2,6-dihydroxy naphthalene, terephthalic acid, and hydroquinone capable of forming an anisotropic melt

摘要

A novel wholly aromatic polyester is provided which contains specified concentrations of recurring 2,6-dicarboxynaphthalene moiety, 2, 6- dioxynaphthalene moiety, terephthaloyl moiety, and 1,4-dioxybenzene moiety. It has been found that such polyester is capable of exhibiting an anisotropic melt phase which is readily melt processable to form quality fibers, films, molded articles, etc. The absence in the polymer chain of moieties derived from hydroxy acids has been found to yield a highly linear more extended polymer chain along the polyester which contributes to the stiffness characteristics of shaped articles comprising the same.