Coated sodium percarbonate particles, process for the production thereof and use thereof

US5935708A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Ruediger Schuette · Alzenau, DE
• Martin Bewersdorf · Gelnhausen, DE
• Claas-Juergen Klasen · Alzenau, DE

Key dates

• Filing date: Nov 25, 1996
• Grant date: Aug 10, 1999
• Expiry date: Nov 25, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2991
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

In order to increase active oxygen stability, sodium percarbonate is coated with single or multiple layers of various substances. Sodium percarbonate particles consist of a core of sodium percarbonate fluidized bed spray granulate and sodium sulphate, which may be partially hydrated, as the sole constituent of a single coating layer. The particles exhibit both elevated active oxygen stability and very good ensilability. The coating layer is applied by spraying an aqueous Na.sub.2 SO.sub.4 solution onto the particles to be coated, which were themselves produced by fluidized bed spray granulation, in a fluidized bed and vaporizing water at a fluidized bed temperature of 35 to 100.degree. C.