Method for producing cellulose sulfoacetate derivatives and products and mixtures thereof
US6800754B1 · kind B1 · utility
6Cited by
3References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Mar 4, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B7/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for directly producing a mixture of cellulose sulfoacetate derivatives by esterification of cellulosic material, characterized in that it comprises the following steps i) the cellulosic material is suspended in a glacial acetic acid solution and the excess acetic acid is eliminated ii) the cellulosic acid that is swollen with acetic acid is suspended in a sulfuric acid solution in glacial acetic acid and iii) the cellulose material is made to react by adding acetic anhydride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.