The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 1978
Filed:
Apr. 20, 1977
Gordon W Calundann, North Plainfield, NJ (US);
Herbert L Davis, Convent Station, NJ (US);
Frederick J Gorman, Succasunna, NJ (US);
Robert M Mininni, Charlotte, NC (US);
Celanese Corporation, New York, NY (US);
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.