Process for making lyocell fibers from alkaline pulp having low average degree of polymerization values
US6491788B2 · kind B2 · utility
78Cited by
111References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Oct 10, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2965
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to a process for making a lyocell fiber by contacting an alkaline pulp having cellulose and at least about 7% hemicellulose under alkaline conditions with an amount of an oxidant sufficient to reduce the average degree of polymerization of the cellulose to the range of from about 200 to about 1100 without substantially reducing the hemicellulose content of the pulp or increasing the copper number and then forming fibers from the pulp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.