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US5032137A P-phenylenediamines, process for preparation thereof, dyeing compositions containing them and corresponding dyeing process 失效
对苯二胺,其制备方法,含有它们的染色组合物和相应的染色方法

P-phenylenediamines, process for preparation thereof, dyeing
compositions containing them and corresponding dyeing process
摘要:
The invention relates to p-phenylenediamines of formula: ##STR1## in which R.sub.1 denotes an alkyl, hydroxyalkyl or polyhydroxyalkyl radical and R.sub.2 denotes a hydrogen atom or an alkyl radical, as well as the corresponding salts with acids, and to the compositions and the process for dyeing keratinous fibres, and especially hair, employing them.
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