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AssigneeSolvay Interox Limited
InventorsHelmut Honig, Werner Doetsch, Manfred Mathes, Klaus-Guenter Gerling, Gerd Hecken
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The use of lactobionic acid, lactobionic acid salts and/or lactobionic acid derivatives as covering material is disclosed for coating alkali metal peroxy salts, in particular for coating sodium percarbonate. In an advantageous alternative of the invention, alkali metal peroxy 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 stabilizes the alkali metal peroxy 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 peroxy salts, in particular for coating sodium percarbonate. The invention is preferably used for coating and stabilizing sodium percarbonate.
A coated particulate alkali metal peroxy salt comprising a core comprising at least one alkali metal peroxy salt selected from the group consisting of peroxycarbonates, peroxypyrophosphate, peroxytripolyphosphate and peroxymonosulphate, said at least one peroxy salt being surrounded by a coating layer comprising at least one substance selected from the group consisting of lactobionic acid, lactobionic acid salts and lactobionic acid derivatives.
A method of coating an alkali metal peroxy salt comprising applying to particles of said peroxy salt a coating material comprising at least one substance selected from the group consisting of lactobionic acid, lactobionic acid salts and lactobionic acid derivatives, said particles comprising at least one peroxy salt selected from the group consisting of peroxycarbonates, peroxypyrophosphate, peroxytripolyphosphate and peroxymonosulphate.
A detergent or bleaching composition comprising an effective bleaching amount of a coated particulate alkali metal peroxy salt and at least one conventional detergent or bleaching composition ingredient;
Dependencies are inferred from the claim text.