Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1977-04-20
1978-04-11
Lee, Lester L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 334P, 260 49, C08G 6306, C08G 6318
Patent
active
040838293
ABSTRACT:
A wholly aromatic polyester is provided which has been found to be highly amenable to melt extrusion to yield high performance fibers. Such fibers following thermal treatment exhibit high tenacity and tensile modulus properties which are well retained at elevated temperatures while exhibiting a low degree of shrinkage. Unlike wholly aromatic polyesters normally encountered in the prior art, the polymer of the present invention is not intractable and may be melt extruded with ease at temperatures below approximately 300.degree. C., and preferably below approximately 280.degree. C. The aromatic polyester of the present invention consists essentially of recurring units (a) p-oxybenzoyl moiety, (b) 2,6-dicarboxynaphthalene moiety, (c) symmetrical dioxy aryl moiety (as defined), and (d) isophthaloyl moiety and/or metal-dioxy phenylene moiety, and is free of units which possess ring substitution. The wholly aromatic polyester of the present invention forms an atypical thermotropic melt phase which is exhibited in the absence of ring substitution at a relatively low temperature which facilitates fiber formation with ease. The wholly aromatic polyester of the present invention following melt spinning and thermal treatment commonly can exhibit an average single filament tenacity of at least 15 grams per denier, and an average single filament tensile modulus of at least 300 grams per denier.
REFERENCES:
patent: 3637595 (1972-01-01), Cottis et al.
patent: 3890256 (1975-06-01), McFarlane et al.
Calundann Gordon W.
Davis Herbert L.
Gorman Frederick J.
Mininni Robert M.
Celanese Corporation
Lee Lester L.
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