Process of making regenerated cellulose articles
US5441689A · kind A · utility
13Cited by
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18Claims
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Key dates
| Filing date | May 9, 1994 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | May 9, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/62
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Aqueous solutions of an amine N-oxide such as N-methyl morpholine N-oxide used in the manufacture of regenerated cellulose can be purified by passage through a strongly basic anion-exchange resin. The resin is regenerated by treatment with (1) an aqueous solution of a strong inorganic acid such as hydrochloric or sulphuric acid and (2) an aqueous solution of sodium hydroxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.