Detersive polyanhydroaspartic acids and biodegradable hydrolysates thereof
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United States of America Patent
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Jul 16, 1996
Grant Date -
N/A
app pub date -
Apr 25, 1994
filing date -
Apr 23, 1993
priority date (Note) -
Expired
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Abstract
Novel polyanhydroaspartic acids (containing not more than 3% of NH groups of the imide moieties thereof relative to the total amount of CH moieties of the succinimide moieties thereof) and the at least 90%.+-.5% biodegradable hydrolysates thereof (containing not more than 3% of primary amide groups relative to the secondary amide groups of the aspartic moieties thereof) are well suited as detergent (co)builders, the former being prepared by thermally polymerizing aspartic acid in the presence of an effective amount of at least one boron compound having at least one B-OH group, or precursor thereof, and the latter by hydrolyzing the polyanhydroaspartic acid thus obtained.
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