Patent · US Active

Method for removing sulfur from fiber using an aqueous acid

US9464370B2 · kind B2 · utility

1Cited by

6References

14Claims

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	Oct 11, 2016
Priority date	—
Expiry date	Jul 5, 2032

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD01F6/805
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The present invention concerns methods for removing sulfur from a fiber made from a polymer comprising imidazole groups, said method comprising: contacting never-dried sulfate anion-containing polymeric-fiber with an aqueous acid having a pKa of less than 5 to displace at least a portion of the sulfate anions; and b) rinsing the fiber to remove the displaced sulfate ions.

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