Cellulose carbamate products of lowered carbamate content
US4923979A · kind A · utility
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4Claims
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Key dates
| Filing date | Apr 5, 1989 |
| Grant date | May 8, 1990 |
| Priority date | — |
| Expiry date | Apr 5, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B15/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The carbamate content of cellulose carbamate products is reduced by treating such products with solutions of a base, which solution also contains one or several alkali metal salts, particularly carbonates, sulfates, phosphates, borates and acetates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.