Melt processable thermotropic wholly aromatic polyester

An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300.degree. C. consisting of the recurring moieties I, II, III, and IV wherein:

• ##STR15## and wherein said polyester comprises approximately 40 to 60 mole percent of moiety I, approximately 3 to 15 mole percent of moiety II, approximately 20 to 30 mole percent of moiety III, and approximately 10 to 27 mole percent of moiety IV.

An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximately 300.degree. C. consisting essentially of the recurring moieties I, II, III, and IV wherein:

• ##STR16## III is a symmetrical dioxy aryl moiety of the formula where Ar is a divalent radical comprising at least one aromatic ring, and
• Iv is selected from the group consisting of ##STR17## and mixtures of (a) and (b), and wherein said polyester comprises approximately 40 to 70 mole percent of moiety I, approximately 7.5 to 30 mole percent of moiety II, approximately 7.5 tp 30 mole percent of moiety III, and approximately 4 to 20 mole percent of moiety IV, and wherein each moiety of said polyester is free of ring substitution.

An improved melt processable wholly aromatic polyester capable of forming a thermotropic melt phase at a temperature below approximatey 300.degree. C. consisting of the recurring moieties I, II, III, and IV wherein:

• ##STR20## IV is selected from the group consisting of ##STR21## and mixtures of (a) and (b), and wherein said polyester comprises approximately 40 to 70 mole percent of moiety I, approximately 7.5 to 30 mole percent of moiety II, approximately 7.5 to 30 mole percent of moiety III, and approximately 4 to 20 mole percent of moiety IV.