Thermotropic copolyester, process for preparing it and use thereof in the preparation of vulcanized rubbers

摘要

A thermotropic copolyester, which displays a liquid-crystal phase of nematic type, within a desired temperature range, contains units deriving from: (a) a saturated, aliphatic dicarboxy acid; (b) 4,4'-dihydroxy-biphenyl and/or mono- or di-alkyl- or -alkenyl-derivatives thereof; (c) 4-hydroxy-benzoic acid and/or alkyl- or alkenyl-derivatives thereof. Such a copolyester improves the processability of unsaturation-containing elastomers and enhances the mechanical properties of subsequently vulcanized products.