| abstract |
A thermotropic aromatic polyester comprising (a) an aromatic dicarbonyl ingredient comprising recurring aromatic units of the formulae (I) and/or (II): ##STR1## and, optionally, other recurring aromatic dicarbonyl units, (b) an aromatic dioxy ingredient comprising recurring aromatic units of the formula (III) ##STR2## wherein R═--H, C 1-8 alkyl, aryl or Halogen atom, and optionally, (c) an aromatic oxycarbonyl ingredient comprising recurring aromatic oxycarbonyl units, of, for example, the formula (IV): ##STR3## |