Bleaching compositions and processes employing sulfamates and polyaminocarboxylic acids
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United States of America Patent
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Jul 8, 1997
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N/A
app pub date -
Jan 30, 1995
filing date -
Jan 30, 1995
priority date (Note) -
Expired
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Abstract
Pulp bleaching processes employing peroxides and/or oxygen are improved by using bleaching additives, preferably before the application of the peroxide and/or oxygen. The bleaching additives contain at least one alkali metal sulfamate such as a sodium sulfamate and a polyaminocarboxylic acid such as DTPA or a salt thereof, such as sodium DTPA.
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