Process for the direct dyeing of keratinous fibres using water v

Details Process for the direct dyeing of keratinous fibres using water v Process for the direct dyeing of keratinous fibres using water v

1994-12-16

1996-03-05

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Hair dyeing

8405, 8415, 8421, 132208, A61K 713

Patent

active

054963770

ABSTRACT:
A process for the direct dyeing (or colouring) of keratinous fibres, in particular human keratinous fibres, comprising the step of: directly dyeing the fibres by contacting the fibres (1) with a composition containing at least one direct dye chosen from specific 2-nitro-para-phenylenediamine derivatives and/or nitro derivatives of specific aminophenols, and (2) with a gas containing water vapour, the temperature of the gas being at least 75.degree. C. and the contact time between the gas and the fibres to be dyed not exceeding two minutes. The hair is dyed uniformly over the whole head of hair, from the roots to the ends, regardless of the condition of the hair.

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The Chemistry of Synthetic Dyes, vol. V, Academic Press, 1971, pp. 508-518.

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