Polymerized alkaline lignin materials
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United States of America Patent
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Jul 20, 1999
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N/A
app pub date -
Jan 21, 1998
filing date -
Jan 21, 1998
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Abstract
A method for preparing a polymerized alkali lignin material which comprises reacting an alkaline solution of alkali lignin obtained from an alkaline pulping process at a temperature between about 20.degree. C. to 90.degree. C. with between 5% to 80% by weight based on said alkali lignin of sodium persulfate at a pH of between about 7 to 12 for a sufficient time to form a polymerized alkali lignin. Optionally, the alkaline solution of alkali lignin may be oxidized for a period time sufficient to activate the alkali lignin prior to reacting the solution with sodium persulfate.
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