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US4601726A Dye composition for the direct dyeing of keratinic fibres, containing at least one N-substituted cosolubilized 2-nitroparaphenylenediamine and corresponding processes for dyeing keratinic fibres 失效
用于直接染色角蛋白纤维的染料组合物,其含有至少一种N-取代的共偶联的2-硝基对苯二胺和用于染色角蛋白纤维的相应方法

Dye composition for the direct dyeing of keratinic fibres, containing at
least one N-substituted cosolubilized 2-nitroparaphenylenediamine and
corresponding processes for dyeing keratinic fibres
摘要:
The invention provides a composition and process for directly dyeing keratinic fibres. The combination of 1-N-methylamino-2-nitro-4-N'-methyl-N'-(2' ,3'-dihydroxypropyl)amino benzene with certain 2-nitroparaphenylenediamine direct nitro dyes produces a dye composition in which the dyes can be more concentrated (without crystallizing out) and hence produce darker shades.
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