Method for adjusting the degree of substitution with acetyl group of cellulose acetate
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United States of America Patent
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Mar 2, 2010
Grant Date -
Feb 5, 2004
app pub date -
Mar 14, 2002
filing date -
Mar 14, 2001
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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.
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