Liquid crystalline copoly(ester-imide)s and a process for the preparation thereof
AssigneeOptatech Corporation
InventorsHeli Alanko, Hans Kricheldorf, Ari Salmela
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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.
Claims41
A liquid crystalline aromatic copoly(ester-imide) polymer, comprising at least one structural unit of formula (I) ##STR11## or formula (II) ##STR12## and a structural unit of formula (III)
- ----CO--Ar--CO--O--al--O!.sub.n --
- wherein Ar is phenylene or naphthalenylene, al is an aliphatic residue containing 1-6 carbon atoms and n is an integer from 1 to 500,
- the molar ratio between the structural unit of formula (III) and the structural unit of formula (I) or formula (II), respectively, being from 1:100 to 100:1.
A liquid crystalline copoly(ester-imide) containing the structural units derived from N-(4'-carboxyphenyl)trimellitic acid, 1,4-benzene dicarboxylic acid, substituted 1,4-dihydroxybenzene, an aromatic hydroxyacid and a poly(alkylene terephthalate), a poly(alkylene naphthalate) or poly(cyclohexanol terephthalate).
A process for preparing a liquid crystalline copoly(ester-imide), comprising the step of polycondensing at least one aromatic polyester comprising poly(alkylene terephthalate), poly(alkylene naphthalate) and poly(cyclohexanol terephthalate) with N-(3'-hydroxyphenyl)-trimellitic acid imide or N-(4'-carboxyphenyl)trimellitic acid imides or with derivatives thereof.
Dependencies are inferred from the claim text.