COATED ALKALI METAL PEROXO SALTS AND PROCESS FOR PRODUCING THE SAME

摘要

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.