Process for adjusting degree of acetyl substitution of cellulose acetate
US8455637B2 · kind B2 · utility
0Cited by
8References
7Claims
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Key dates
| Filing date | Mar 16, 2011 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Mar 16, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08B3/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for adjusting an intermolecular or intramolecular 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.