Abstract: A thermotropic main-chain liquid crystalline homo- or copolymer forming a liquid crystalline phase and containing an aromatic monomer with functional groups in ortho- or meta-position. The polymer exhibits both isotropic and anisotropic properties. The present invention also provides a method for the preparation of the present polymers as well as a method of increasing the melt-processibility of polyester-based liquid crystalline polymers comprising the step of incorporating into the polymers 1 to 30 mol-% of, e.g., a ortho-substituted monomer with hydroxyl and/or carboxylic groups.

Abstract: The present invention relates to liquid crystalline copoly(ester-imides) and a process for the preparation thereof. In particular, the invention relates to liquid crystalline copoly(esteri-imides) comprising structural units derived from N-(3'-hydroxyphenyl)-trimellitic acid imide or N-(4'-carboxyphenyl)trimellitic acid imides optionally in combination with aromatic dicarboxylic acids, dioles or hydroxy acids. The invention also concerns the use of these copolymers in polymer blends, in moulded articles, in fibres, filaments and sheets.