Treatment of polyamide with gas phase of acid, anhydride or amine
US6448370B2 · kind B2 · utility
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7References
10Claims
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Key dates
| Filing date | Dec 18, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Jan 23, 2021 |
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.