Patent · US Active

Copolymer fibers and processes for making same

US8957183B2 · kind B2 · utility

1Cited by

6References

15Claims

0Family size

Assignee

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

Inventors

Warren Francis Knoff · Richmond, US
Christopher William Newton · Richmond, US

Key dates

Filing date	Jan 13, 2012
Grant date	Feb 17, 2015
Priority date	—
Expiry date	Jan 13, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2913
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl)benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl)benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.

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