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:
Aug. 17, 2010
Filed:
Mar. 27, 2006
Steven R Allen, Midlothian, VA (US);
Steven D Moore, Powhatan, VA (US);
Christopher William Newton, Richmond, VA (US);
David J Rodini, Midlothian, VA (US);
Doetze Jakob Sikkema, Richmond, VA (US);
Steven R Allen, Midlothian, VA (US);
Steven D Moore, Powhatan, VA (US);
Christopher William Newton, Richmond, VA (US);
David J Rodini, Midlothian, VA (US);
Doetze Jakob Sikkema, Richmond, VA (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Magellan Systems International, LLC, Bethesda, MD (US);
Abstract
The present invention concerns a process for making a polyareneazole multifilament yarn comprising: a) extruding a solution comprising polyareneazole polymer and polyphosphoric acid through a plurality of orifices to produce filaments; b) forming a multifilament yarn from said filaments; c) hydrolyzing at least some of the polyphosphoric acid in the yarn by heating the yarn to a temperature above about 120° C. for up to about two minutes; d) washing at least some of the hydrolyzed polyphosphoric acid from the yarn; e) drying the washed yarn; f) optionally, heating the yarn above about 300° C., and g) collecting the yarn at a speed of at least about 50 meters per minute.