Melt processable thermotropic aromatic copolyesters

摘要

The invention relates to a class of copolyesters which display optical anisotropy in the molten state and to the shaped articles, fibers and films obtained from the optically anisotropic melts. The copolyesters comprise recurring structural units (a) independently each occurrence selected from the group consisting of Formulas I and II; recurring structural units (b) independently each occurrence selected from the group consisting of Formulas III and V; recurring structural units (c) independently each occurrence selected from the group consisting of Formula IV; and optionally recurring structural units (d) independently each occurrence selected from the group consisting of Formula VI: <IMAGE> I <IMAGE> II <IMAGE> III <IMAGE> IV <IMAGE> V <IMAGE> VI wherein R independently each occurrence is a chemically inert substituent.