Coated sodium percarbonate particles, a process for their preparation and their use

US5902682A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

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

Key dates

• Filing date: Jan 16, 1996
• Grant date: May 11, 1999
• Expiry date: Jan 16, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Coated sodium percarbonate particles contain, in the coating, sodium carbonate and also one or more magnesium compounds, preferably magnesium sulfate, optionally in a partially hydrated form, in a single layer or in separate layers in the coating. Preferred coated sodium percarbonate particles contain two layers. Particles are prepared by spraying aqueous solutions containing the coating components onto sodium percarbonate in a fluidized bed with simultaneous evaporation of the water. The particles are suitable for use in detergents, bleaches and cleansing agents.