Ammoxidized lignosulfonate cement dispersant
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United States of America Patent
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May 29, 2001
Grant Date -
N/A
app pub date -
Apr 21, 1999
filing date -
Apr 21, 1999
priority date (Note) -
Expired
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Abstract
A modification to lignosulfonate is disclosed, the effect of which is to reduce the set retarding and air entraining properties normally experienced when using lignosulfonates as water reducing admixtures in cement compositions. The modified lignosulfonate is obtained by oxidative reaction of a lignosulfonate or one of its salts with ammonia or other amine in an aqueous solution.
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