C - Chemistry – Metallurgy – 11 – D
Patent
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) C11D 17/04 (2006.01) D06L 3/02 (2006.01)
Patent
CA 2382115
A method for bleaching stained fabrics is provided by washing a stained fabric in an aqueous wash liquor in the presence of a wash additive that comprises a ligand that forms a transition metal complex as bleach catalyst, the complex catalysing bleaching of stains by atmospheric oxygen. The wash additive 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 wash additive and the wash liquor are substantially devoid of peroxygen bleach or a peroxy-based or -generating bleach system. The wash additive provides improved or broader stain profile bleaching.
L'invention concerne un procédé de blanchiment pour textiles tachés. Ce procédé consiste à laver un textile taché dans une lessive aqueuse en présence d'un additif de lavage comprenant un ligand qui forme un complexe de métal de transition agissant comme catalyseur de blanchiment. Ce complexe catalyse le blanchiment des taches par l'oxygène atmosphérique. L'additif de lavage comprend de préférence un complexe de fer contenant le ligand N, N-bis (pyridin-2-yl-méhyle)-1,1-bis(pyridin-2-yl)-1-aminoéthane. L'additif de lavage ou/et la lessive sont sensiblement exempts d'agents de blanchiment peroxygéné ou de systèmes à base de peroxy ou générant du peroxy. Cet additif de lavage permet un blanchiment amélioré ou couvrant un profil de taches plus étendu.
Delroisse Michel Gilbert Jose
Jones David Andrew Ross
Smith Richard George
Wells John Francis
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Plc Unilever
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