Polyester of para-hydroxy benzoic acid, 1,4-bis(para-carboxyphenoxy) benzene, aromatic diol and aromatic diacid capable of undergoing melt processing

Claim 1

A melt processable wholly aromatic polyester capable of forming an anisotropic melt phase at a temperature below approximately 400° C. consisting essentially of the recurring moieties I, II, III, and IV wherein: ##STR14## III is a dioxy aryl moiety of the formula --O--AR--O-- where Ar is a divalent radical comprising at least one aromatic ring wherein at least one hydrogen atom present upon an aromatic ring optionally may be substituted with methyl, chloro, bromo, phenyl, alkoxy having 1 to 4 carbon atoms, and mixtures of the foregoing, and IV is a dicarboxy aryl moiety of the formula ##STR15## where Ar' is a divalent radical comprising at least one aromatic ring wherein at least one hydrogen atom present upon an aromatic ring optionally may be substituted with methyl, chloro, bromo, phenyl, alkoxy having 1 to 4 carbon atoms, and mixtures of the foregoing, and wherein said polyester comprises approximately 30 to 60 mole percent of moiety I, approximately 10 to 30 mole percent of moiety II, approximately 20 to 35 mole percent of moiety III, and approximately 10 to 25 mole percent of moiety IV.