Sodium percarbonate particles with improved storage stability

C - Chemistry – Metallurgy – 11 – D

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Details

C11D 3/39 (2006.01) C11D 17/00 (2006.01)

Patent

CA 2511022

The invention relates to sodium percarbonate particles with improved storage stability in the presence of builders. The inventive sodium percarbonate particles contain, on the surface thereof, between 0.01 and 1 wt. % of a hydrophobic, fine-particle oxide of the elements silicon, aluminium, or titanium or a mixed oxide of said elements. The inventive particles can be produced by mixing sodium percarbonate particles with between 0.01 and 1 wt. % of the hydrophobic, fine-particle oxide, the sodium percarbonate being preferably mixed, in the dry state, with the fine-particle oxide. The inventive particles have a high storage stability, can be handled and stored without dust formation and without caking of the particles, and can be easily dispersed in water without leaving any residues.

Particules de percarbonate de sodium à durée de conservation en stockage améliorée en présence d'adjuvants. Les particules de percarbonate de sodium selon la présente invention contiennent sur leur surface 0,01 à 1 % en poids d'un oxyde à fines particules rendu hydrophobe des éléments silicium, aluminium ou titane ou d'un oxyde mixte desdits éléments. Les particules selon la présente invention sont fabriquées par mélange de particules de percarbonate de sodium avec 0,01 à 1 % en poids de l'oxyde à fines particules rendu hydrophobe, le percarbonate de sodium étant de préférence mélangé à l'état sec avec l'oxyde à fines particules. Les particules selon la présente invention possèdent une longue durée de conservation en stockage, peuvent être manipulées et stockées sans formation de poussière et sans agglomération des particules et sont facilement dispersibles dans l'eau, sans produire de résidus.

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