Polyesters of derivatives of hydroquinone and bis(carboxyphenyl)ether

A fiber-forming melt spinnable polyester capable of forming an anisotropic melt and consisting essentially of units of the formula:

• I --O--A--O--
• and ##SPC2##
• wherein A is selected from the group of chloro-, bromo-, methyl- and dimethyl-1,4-phenylene radicals;
• up to 20 mol % of formula I units may be replaced with --O--X--O-- units where X is selected from the group of 1,4-phenylene, ethyl-, tertiary butyl- and dichloro-1,4-phenylene, 4,4'-biphenylene, oxybis(1,4-phenylene), thiobis(1,4-phenylene), 3,3',5,5'-tetrachloro-4,4'-biphenylene and 3,3',5,5'-tetramethyl-4,4'-biphenylene and up to 20 mol % of formula II units may be replaced with ##EQU4## units where Y is selected from the group of 1,3-phenylene, 1,4-phenylene, chloro-, bromo-, and methyl-1,4-phenylene, 1,4-cyclohexylene, 2,6-naphthylene, 4,4'-biphenylene, and ethylenedioxybis(1,4-phenylene) with the proviso that no more than 10 mol % of the total of formula I, formula II, --O--X--O-- and ##EQU5## units are replaced.