Coated sodium percarbonate particles, a process for their production and detergent, cleaning and bleaching compositions containing them
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Oct 2, 1995
filing date -
Apr 10, 1993
priority date (Note) -
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Abstract
Sodium percarbonate is often used in the form of coated particles to increase its storage stability in detergents. Sodium percarbonate particles coated in accordance with the invention have a coating containing reaction products from the reaction of a dialkali metal tetraborate or alkali metal pentaborate with aqueous hydrogen peroxide. Preferred coating components are: perborax with the formula Na.sub.2 B.sub.4 O.sub.7 .multidot.H.sub.2 O.sub.2, where n =2 or 4. The coated sodium percarbonate particles are produced by coating the percarbonate particles using a solution containing the reaction products mentioned above. Detergent, bleaching and cleaning compositions containing sodium percarbonate particles coated in accordance with the invention are distinguished by very high stability in storage.
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