Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Patent
1996-12-23
1998-12-01
Acquah, Samuel A.
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
528272, 528292, 528296, 528298, 528302, 528308, 528310, 525437, 525444, 525445, 525450, 525540, 428 357, 428 363, 428364, 428373, B29D 2200, B32B 108, C08G 6908
Patent
active
058435417
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to liquid crystalline copoly(ester-imide)s and to a process for the preparation thereof. In particular, the invention concerns liquid crystalline copoly(ester-imide)s containing structural units derived from N-(3'-acetoxyphenyl)-tri-mellitic acid imide or N-(4'-carboxyphenyl)trimellitic acid imide optionally in combination with aromatic dicarboxylic acids, diols or hydroxyacids, in particular 2,6-hydroxynaphthoic acid. Furthermore the invention concerns a process for the preparation of these copolymers. The invention also relates to their use in polymer blends, in moulded articles, fibres, filaments and sheet products.
DESCRIPTION OF RELATED ART
Various copoly(ester-imide)s containing derivatives of trimellitic acid anhydride are known to be thermally stable engineering plastics. The synthesis of trimellitic acid anhydride with aminophenols or aminobenzoic acids yields corresponding imides, as described in the published DE Patent Application No. 3,737,067 and Kricheldorf et al. Macromolecules 24 (1991) 1011.
Homopoly(ester-imide)s of different hydroxyphenyl trimellitic acid imides are described in U.S. Pat. No. 3,542,731. Binary copoly(ester-imide)s of N-(3'-hydroxyphenyl)trimellitic imide and N-(4'-carboxyphenyl)trimellitic imide, respectively, with 2-hydroxy-6-naphthoic acid, 3-phenyl-1,4-dihydroxybenzene and 3-(tert-butyl)-1,4-dihydroxybenzene, having the following formulas ##STR1## are disclosed in Kricheldorf et al. Eur. Polym. J. 30 (1994): 4, 549; Kricheldorf et al. Macro-molecules 26 (1993), U.S. Pat. No. 4,954,606.
However, all these binary copoly(ester-imide)s possess glass transition temperatures (T.sub.g) of around or above 200.degree. C. or melting points of over 300.degree. C., which are too high for blending with thermoplastic polymers, such as polyolefins. On the other hand, nematic copolyesters of poly(ethylene terephthalate) and 4-acetoxy-benzoic acid (e.g. Rodrun LC-3000.RTM. and Rodrun LC-5000.RTM. of Unitika) are commercial, but their T.sub.g 's are too low for practical purposes (60.degree.-80.degree. C.), or they are semicrystalline with high contents of 4-acetoxybenzoic acid (cf. U.S. Pat. No. 3,804,805). The LC-polyester of Hoechst Celanese (Vectra A950.RTM.), described in DE Patent No. 3,015,386, U.S. Pat. No. 4,395,513, is semicrystalline and its T.sub.m, 280.degree. C., is much too high for melt processing with thermoplastics.
SUMMARY OF THE INVENTION
Based on what has been stated above, it is an object of the present invention to provide liquid crystalline polymers having high glass transition temperatures and good thermal stabilities which are suitable for blending with other polymeric components.
It is another object to provide a process for preparing such polymers.
It is a third object to provide polymer blends as well as fabricated products based on the novel polymers.
The present invention is based on the finding that certain copoly(ester-imide)s based on aromatic polyesters (containing phenylene of naphthalenylene residues in the main chain) possess all the properties required of blend components. In particular the present invention provides copoly(ester-imide)s containing at least one structural unit of formula (I) ##STR2## or formula (II) ##STR3## and a structural unit of formula (III) cyclic aliphatic residue with 1 to 6 carbon atoms, 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.
The structural unit of formula (III) can, for instance, be comprised of poly(ethylene therephthalate) of formula IIIa ##STR4## or poly(ethylene naphthalate) of formula IIIb ##STR5## or poly(butylene terephthalate) of formula IIIc, ##STR6## wherein n has the same meaning as above.
The process according to the invention comprises the step of polycondensing an aromatic polyester, such as poly(ethylene terephthalate), poly(ethylene naphthalate), poly(butylene terephthalate), poly(butylene naphthala
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Alanko Heli
Kricheldorf Hans
Salmela Ari
Acquah Samuel A.
Optatech Corporation
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