US 4,375,530 A · Polyester of 2,6-naphthalene dicarboxylic acid, 2,6-dihydroxy naphthalene, terephthalic acid, and hydroquinone capable of forming an anisotropic melt

Abstract

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.

Claims18

Dependent claims

A melt processable polyester capable of forming an anisotropic melt phase at a temperature below approximately 350.degree. C. consisting essentially of the recurring moieties I, II, III, and IV which are free of ring substitution wherein:

##STR9## wherein said polyester comprises approximately 20 to 30 mole percent of moiety I, approximately 20 to 30 mole percent of moiety II, approximately 20 to 30 mole percent of moiety III, and approximately 20 to 30 mole percent of moiety IV, and wherein the total molar concentration of moieties I and III is substantially identical to the total molar concentration of moieties II and IV.

Dependencies are inferred from the claim text.

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

Life of this patent

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

Life of this patent

Abstract

Claims18