Method of pretreating and bleaching stained fabrics

Details Method of pretreating and bleaching stained fabrics Method of pretreating and bleaching stained fabrics

C - Chemistry, Metallurgy

11

D

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

Patent

CA 2382114

A method for bleaching stained fabrics is provided by pretreating the stained fabric, before washing, with a pretreatment composition that comprises a ligand that forms a transition metal complex as bleach catalyst, the complex catalysing bleaching of stains by atmospheric oxygen. The pretreatment composition preferably comprises an iron complex comprising the ligand N,N- bis(pyridin-2-yl-methyl)-1,1-bis(pyridin-2-yl)-1-aminoethane. One or both of the pretreatment composition and the wash liquor are substantially devoid of peroxygen bleach or a peroxy-based or -generating bleach system. The pretreatment provides improved or broader stain profile bleaching.

L'invention concerne un procédé de blanchiment pour textiles tachés, consistant à prétraiter le textile taché avant le lavage, à l'aide d'une composition de prétraitement qui comprend un ligand formant un complexe de métal de transition en tant que catalyseur de blanchiment. Ce complexe catalyse le blanchiment des taches par l'oxygène atmosphérique. La composition de prétraitement comprend de préférence un complexe de fer contenant le ligand N,N-bis (pyridin-2-yl-méthyle)-1,1-bis(pyridin-2-yl)-1-aminoéthane. La composition de prétraitement et/ou la lessive de lavage sont sensiblement exempts d'agent de blanchiment peroxydé ou d'un système à base de peroxy ou générant du peroxy. Ce prétraitement permet un blanchiment amélioré des taches ou couvrant un profil de taches plus étendu.

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