Bleach and oxidation catalyst

Details Bleach and oxidation catalyst Bleach and oxidation catalyst

C - Chemistry, Metallurgy

11

D

C11D 3/395 (2006.01) C11D 3/30 (2006.01) C11D 3/39 (2006.01) D06L 3/02 (2006.01)

Patent

CA 2350571

A bleach and oxidation catalyst is provided comprising a catalytically active iron, manganese or copper complex including a specified pentadentate nitrogen-containing ligand. The metal complex can activate hydrogen peroxide or peroxyacids and provides favourable stain removal properties. In addition, a considerably improved stability of these metal complex compounds in alkaline aqueous environment has been obtained, in particular at the peroxy compound concentrations generally present in the fabric washing liquor.

L'invention concerne un catalyseur de blanchiment et d'activation. Ce catalyseur comprend un fer présentant une activité catalytique, et un complexe de manganèse ou de cuivre comprenant un ligand à base d'azote pentadentate. Ce complexe métallique peut activer du péroxyde d'hydrogène ou des péroxyacides et offre de bonnes propriétés détachantes. En outre, la stabilité de ces composés du complexe métallique a été considérablement améliorée dans un environnement aqueux alcalin, en particulier, au niveau des concentrations de composé de péroxy généralement présentes dans le produit de lavage de tissus.

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