C - Chemistry – Metallurgy – 11 – D
Patent
C - Chemistry, Metallurgy
11
D
C11D 3/39 (2006.01)
Patent
CA 2273168
The invention provides a bleaching composition of pH 10-14 which comprises an oxygen transfer agent and hydrogen peroxide. It is believed that the reaction of hydrogen peroxide with the imine quat. oxygen transfer agents proceeds through a different route than that of the organic and inorganic peroxides. As a consequence, the formation of acyl hydroxamate is significantly reduced. Furthermore it is believed that when hydrogen peroxide is used as the bleaching agent in the pH range indicated, a surprising improvement in the efficacy of the bleaching system occurs and it is possible to formulate peroxide based systems which have efficacy approaching or exceeding that of hypochlorite without the disadvantages associated with hypochlorite. A further aspect of the present invention provides a method for bleaching a stained substrate which comprises the step of treating the substrate with a bleaching composition of pH 10-14, which bleaching composition comprises an oxygen transfer agent and hydrogen peroxide.
L'invention concerne une composition de blanchiment de pH 10 à 14 contenant un agent de transfert d'oxygène et du peroxyde d'hydrogène. Selon l'invention, la réaction du peroxyde d'hydrogène avec les agents de transfert d'oxygène de l'imine quat. s'opère à travers un parcours différent de celui des peroxydes organiques ou inorganiques. Il en résulte une formation d'hydroxamate d'acyle sensiblement réduite. De plus, selon l'invention, en utilisant le peroxyde d'hydrogène comme l'agent de blanchiment, dans la gamme de pH indiquée, on constate une amélioration surprenante de l'efficacité du système de blanchiment, ce qui permet d'élaborer des systèmes à base de peroxyde ayant une efficacité approchant ou dépassant celle de l'hypochlorite sans les inconvénients liés à l'hypochlorite. Un autre aspect de la présente invention est un procédé de blanchiment d'un substrat taché qui consiste à traiter ledit substrat avec une composition de blanchiment de pH 10 à 14 contenant un agent de transfert d'oxygène et du peroxyde d'hydrogène.
Thompson Katherine Mary
Thornthwaite David William
Bereskin & Parr
Plc Unilever
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