Liquid crystalline polyesters

Claim 1

A copolyester capable of forming a thermotropic melt phase and having an inherent viscosity of at least about 0.3 measured at 30° C. with a solution of 0.5 gm of copolyester per 100 m/ of a solvent composed of 60 weight % phenol and 40% tetrachloroethane, consisting essentially of the following divalent radicals: ##STR2## wherein the placements of the carbonyl groups of the B radicals are meta or para or a mixture of meta and para; wherein R is selected from the group consisting of alkyls of 1 to 6 carbon atoms, phenyl and phenyl substituted with an alkyl of 1 to 6 carbon atoms, chloro, bromo, cyano, formyl, acetyl, and trifluoromethyl; wherein the amount of radical A is in the range from about 10 mole % to about 60 mole % of the copolyester and wherein the amount of radical D is selected in the range from about 1 mole % up to about 50 mole % of the total amount of radicals C and D to provide a ratio of storage moduli of said copolyester determined at T g -50° C. and T g +50° C. less than the ratio of the storage moduli determined at T g -50° C. and T g +50° C. of a copolyester of identical composition except that the D radicals are replaced with C radicals.