Coated sodium percarbonate particles having excellent long term stability, process for their production, their use and detergent compositions containing them
AssigneeSolvay (Societe Anonyme)
InventorsAlfred Söntgerath, Gerd Hecken, Jüergen H. Rabe, Henk L. J. Venbrux
Life of this patent
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Abstract
Sodium percarbonate particles presenting an improved long term stability expressed as a heat output at 40° C. measured after storage during 12 weeks at 40° C., of less than 5 μW/g, or expressed as an Avox recovery of at least 70 after storage for 8 weeks at 55° C. Process for the production of these particles. Use of these particles as bleaching agent in detergent compositions and detergent compositions containing them.
Claims16
Sodium percarbonate particles having a long term stability expressed as heat output at 40° C. of less than 5 μW/g, measured after storage for 12 weeks at 40° C., wherein said particles are coated and comprise a sodium percarbonate core surrounded by at least one coating layer, said particles having a mean particle size of from 300 to 1600 μm, and wherein said coating layer comprises at least one coating agent and small sodium percarbonate particles of a mean particle size smaller than 100 μm.
A process for producing the sodium percarbonate particles having a mean particle size of from 300 to 1600 μm and a long term stability expressed as heat output at 40° C. of less than 5μW/g, measured after storage for 12 weeks at 40° C. comprising manufacturing sodium percarbonate core particles followed by coating the sodium percarbonate core particles with at least one solution or suspension of at least one coating agent and with small sodium percarbonate particles of a mean particle size smaller than 100 μm, in order to obtain the sodium percarbonate particles.
Dependencies are inferred from the claim text.