Process for the production of polyarenazole yarn

US7776246B2 · kind B2 · utility

Assignees

• E.I. DU PONT DE NEMOURS AND COMPANY · US
• Magellan Systems International LLC · US

Inventors

• Steven R. Allen · Midlothian, US
• Steven Moore · Powhatan, US
• Christopher William Newton · Richmond, US
• David J. Rodini · Midlothian, US
• Doetze Jakob Sikkema · Doesburg, NL

Key dates

• Filing date: Mar 27, 2006
• Grant date: Aug 17, 2010
• Expiry date: Mar 27, 2026

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D01F6/74
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

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.