Process for making cellulose extrudates
US5804120A · kind A · utility
4Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1997 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Feb 19, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31841
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Celluloe extrudates can be made from an optically anisotropic solution containing 94-100 wt % of: cellulose; phosphoric acid and/or its anhydrides; and water by extruding the solution, coagulating the formed extrudates, and then aftertreating those extrudates so that they have a degree of acidity which at least equals 7. Fibres obtained by such a process possess particularly good thermal stability and are suitable for use as a reinforcing material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.