Pressed shaped bodies comprising coated sodium percarbonate...

Details Pressed shaped bodies comprising coated sodium percarbonate... Pressed shaped bodies comprising coated sodium percarbonate...

C - Chemistry, Metallurgy

01

B

C01B 15/10 (2006.01) C11D 3/39 (2006.01) C11D 17/00 (2006.01)

Patent

CA 2583830

Disclosed are compressed molded bodies containing coated sodium percarbonate particles. Said compressed molded bodies comprise an inner coating layer that contains one or several water-soluble hydrate-forming salts as well as a superimposed outer coating layer which contains an alkali metal silicate. The inventive molded bodies are provided with an improved shelf life while the loss of active oxygen is low. Preferably, the molded bodies additionally contain at least one surfactant and other optional detergent substances. The disclosed molded bodies can be produced by forming tablets or briquettes from a powdered mixture while being usable in detergents or cleaning agents.

L'invention concerne des corps moulés comprimés contenant des particules de percarbonate de sodium enrobées, présentant une couche d'enrobage intérieure contenant un ou plusieurs sels solubles dans l'eau, formant un hydrate, et une couche d'enrobage extérieure située sur celle-ci, contenant un silicate de métal alcalin. Lesdits corps moulés présentent une meilleure stabilité au stockage ainsi que des pertes en oxygène actif réduites. Lesdits corps moulés contiennent par ailleurs de préférence au moins un tensioactif et éventuellement d'autres agents détergents. Lesdits corps moulés peuvent être fabriqués par mise en tablettes ou briquettes d'un mélange pulvérulent. Lesdits corps moulés peuvent être employés dans des lessives ou des détergents.

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