Polyester of 6-hydroxy-2-naphthoic acid, para-hydroxy benzoic acid, aromatic diol, and aromatic diacid capable of readily undergoing melt processing

Claim 1

A melt processable wholly aromatic polyester capable of forming an anisotropic melt phase at a temperature below approximately 320° C. consisting essentially of the recurring moieties I, II, III, and IV which may include substitution of at least some of the hydrogen atoms present upon an aromatic ring wherein: ##STR13## III is a symmetrical dioxy aryl moiety of the formula --O--Ar--O-- where Ar is a divalent radical comprising at least one aromatic ring, and IV is symmetrical a dicarboxy aryl moiety of the formula ##STR14## where Ar' is a divalent radical comprising at least one aromatic ring, with said optional substitution if present being selected from the group consisting of an alkyl group of 1 to 4 carbon atoms, an alkoxy group of 1 to 4 carbon atoms, halogen, and mixtures of the foregoing, and wherein said polyester comprises approximately 20 to 40 mole percent of moiety I, approximately 10 up to 50 mole percent of moiety II, in excess of 5 up to approximately 30 mole percent of moiety III, and in excess of 5 up to approximately 30 mole percent of moiety IV.