Coated alkali metal peroxo salts and process for producing...

C - Chemistry – Metallurgy – 01 – B

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C01B 15/10 (2006.01) B01J 2/00 (2006.01) B01J 2/28 (2006.01) C01B 15/00 (2006.01) C01B 15/08 (2006.01) C01B 15/16 (2006.01) C11D 3/20 (2006.01) C11D 3/382 (2006.01) C11D 3/39 (2006.01) C11D 17/00 (2006.01)

Patent

CA 2180288

The use of lactobionic acid, lactobionic acid salts and/or lactobionic acid derivatives as covering material is disclosed for coating alkali metal peroxo salts, in particular for coating sodium percarbonate. In an advantageous alternative of the invention, alkali metal peroxo salts are provided with a covering layer that contains as covering materials lactobionic acid and/or lactobionic acid salt mixed with boric acid and/or a boric acid salt as additional covering material. This coating stabilises the alkali metal peroxo salts and protects them against humidity and decomposition. In another advantageous alternative, lactobionic acid, lactobionic acid salts and/or lactobionic acid derivatives are used in combination with or in particular mixed with an inorganic mineral salt mixture of alkali metal sulphate and alkali metal chloride as additional covering material for coating alkali metal peroxo salts, in particular for coating sodium percarbonate. The invention is preferably used for coating and stabilising sodium percarbonate.

L'invention concerne l'utilisation d'acide lactobionique, de sels d'acide lactobionique et/ou de dérivés d'acide lactobionique comme matériaux d'enrobage pour recouvrir des sels peroxo de métaux alcalins, notamment pour recouvrir du percarbonate de sodium. Dans une variante avantageuse de l'invention, on recouvre les sels peroxo de métal alcalin d'une couche d'enrobage qui contient comme matériaux d'enrobage l'acide lactobionique et/ou un sel d'acide lactobionique mélangé avec de l'acide borique et/ou un sel d'acide borique comme matériau supplémentaire d'enrobage. Cet enrobage stabilise les sels peroxo de métaux alcalins et les protège de l'humidité et de la décomposition. Dans une autre variante avantageuse, on utilise l'acide lactobionique, les sels d'acide lactobionique et/ou des dérivés d'acide lactobionique associés ou mélangés à un mélange de sels minéraux inorganiques d'un sulfate de métaux alcalins et d'un chlorure de métaux alcalins comme matériau supplémentaire d'enrobage pour recouvrir des sels peroxo de métal alcalin, notamment pour recouvrir du percarbonate de sodium. L'invention est de préférence utilisée pour recouvrir et stabiliser du percarbonate de sodium.

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