Method for adjusting the degree of substitution with acetyl group of cellulose acetate
US7671193B2 · kind B2 · utility
10Cited by
8References
7Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 14, 2002 |
| Grant date | Mar 2, 2010 |
| Priority date | — |
| Expiry date | Mar 14, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B3/24
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for adjusting an intermolecular or intermolecular degree of acetyl substitution of cellulose acetate is disclosed. The process comprises ripening cellulose acetate in the presence of a catalyst, an acetyl donor, and water or an alcohol. The amount of water and the alcohol is in the range of 0.1 to 10 mol % based on the amount of the acetyl donor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.