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US 5,074,885 AGranted
Process for the dyeing of wool with anionic dyes and ultra-violet absorber and oxidative bleaching following by reductive bleaching
AssigneeCiba-Geigy Corporation
InventorGerhard Reinert
Life of this patent
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Abstract
A process for the dyeing of wool with anionic dyes is described, wherein the wool is dyed in the presence of a UV absorber and bleached oxidatively and then bleached reductively in a new bath. This process makes it possible to produce very bright, brilliant shades.
Claims18
A process for dyeing wool which comprises dyeing wool with an anionic dye;
- oxidatively bleaching the wool before, during or after the dyeing step and after the dyeing and oxidative bleaching steps are completed, in a new bath reductively bleaching the dyed wool;
- with the proviso that the dyeing, the oxidative bleaching or the reductive bleaching is carried out in the presence of an UV absorber.
Dependencies are inferred from the claim text.