Composition and method for bleaching a substrate

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 3/39 (2006.01) C07D 213/38 (2006.01) C07D 213/55 (2006.01) C07D 255/02 (2006.01) C07D 401/14 (2006.01) D06L 3/02 (2006.01)

Patent

CA 2383590

The invention relates to a method of bleaching a substrate that comprises applying to the substrate, in an aqueous medium, a specified ligand which forms a complex with a transition metal, the complex catalysing bleaching of the substrate by atmospheric oxygen. Also provided is an aqueous bleaching composition substantially devoid of peroxygen bleach or a peroxy-based or - generating bleach system. Also provided is a method of treating a textile such as a laundry fabric whereby a complex catalyses bleaching of the textile by atmospheric oxygen after the treatment. The catalyst may be used in dry form, or in a liquor that is then dried, such as an aqueous spray-on fabric treatment fluid or a wash liquor for laundry cleaning, or a non-aqueous dry cleaning fluid or spray-on aerosol fluid.

La présente invention concerne: un procédé permettant le blanchiment d'un substrat, comprenant l'application sur le substrat, dans un milieu aqueux, d'un ligand spécifique qui forme un complexe avec un métal de transition, le complexe catalysant le blanchiment du substrat par oxygène atmosphérique; une composition de décoloration aqueuse essentiellement dépourvue de système de blanchiment peroxygéné ou à base de peroxy ou générateur de peroxy; un procédé de traitement d'un textile pour blanchiment, un complexe catalysant le blanchiment du textile par oxygène atmosphérique après le traitement. Le catalyseur peut être utilisé sous forme sèche, ou dans une liqueur qui est ensuite séchée, telle un liquide de traitement aqueux par pulvérisation sur textile ou une liqueur de lavage pour nettoyage par blanchiment, ou un liquide de nettoyage à sec non aqueux ou un liquide aérosol à pulvériser.

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