Coated sodium percarbonate particles, a process for their production and detergent, cleaning and bleaching compositions containing them

US5658873A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Birgit Bertsch-Frank · Rheinfelden (Baden), DE
• Claas-Juergen Klasen · Alzenau, DE
• Thomas Lieser · Hanau, DE
• Klaus Mueller · Hanau, DE
• Martin Bewersdorf · Gelnhausen, DE

Key dates

• Filing date: Oct 2, 1995
• Grant date: Aug 19, 1997
• Expiry date: Oct 2, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D17/0039
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.