Patent · US Active

Process for preparing yarn derived from aramid copolymer fiber having low residual sulfur

US9315923B2 · kind B2 · utility

0Cited by

10References

32Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Steven R. Allen · Midlothian, US
Vlodek Gabara · Richmond, US
Joseph Lenning Lowery · Cambridge, US
Steven Raymond Lustig · Landenberg, US
Christopher William Newton · Richmond, US
David J. Rodini · Midlothian, US
Andrew J. Sitter · Mechanicsville, US

Key dates

Filing date	Jan 11, 2012
Grant date	Apr 19, 2016
Priority date	—
Expiry date	Mar 15, 2032

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD10B2331/14
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The present invention concerns processes for producing a yarn comprising polymer comprising imidazole groups, the process having the following steps: (a) spinning a solution of polymer in sulfuric acid to give rise to a plurality of dope filaments; (b) coagulating the plurality of dope filaments into a multi-filament as-spun yarn; and (c) washing the as-spun multi-filament yarn with an aqueous acid comprising a halide or an aqueous salt comprising a halide or combination thereof.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.