Patent · US Expired

Treatment of polyamide with gas phase of acid anhydride or amine

US6268468A · kind A · utility

2Cited by

8References

17Claims

0Family size

Assignee

BASF SE

Inventors

Otto M. Ilg · Asheville, US
Harry Hu · Arden, US
Scott R. Brank · Weaverville, US

Key dates

Filing date	Jul 10, 2000
Grant date	Jul 31, 2001
Priority date	—
Expiry date	Jul 10, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2971
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The end group content of polyamide in the solid state may be reduced by treating the polyamide with gas-phase acid, anhydride, or amine. Stain- or dye-resistant polyamide fibers can be made by reducing the number of amino end groups. Reduction in the number of carboxylic end groups reduces the rate of regeneration of starting monomers during extrusion.

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