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Isolde Lowe

Thomas Clausen

Wolfgang R Balzer

Stefan Gerstung

The oxidation hair dye composition for oxidative dyeing of hair is based on a combination of developer substance and coupler substance and contains at least one 3,4,5-triamino-pyrazole derivative compound selected from the group consisting of 1-methyl-3,4,5-triaminopyrazole, 3,5-diamino-1-methyl-4-methylaminopyrazole, 3,5-diamino-4-(2'-hydroxyethyl) amino-1-methylpyrazole and physiologically compatible, water-soluble salts of the foregoing pyrazole derivative compounds, as the developer substance. The invention also includes novel 3,4,5-triaminopyrazole derivative compounds.

Oxidation hair dye compositions containing 3,4,5-triaminopyrazole

A process is disclosed for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitro-benz ene, by means of a two-stage technique proceeding from the reaction product of 1,4-diamino-2-nitrobenzene with chloroformic acid chloroethyl ester, or by means of a multiple-stage technique which is based upon an improved process for the production of the pre-stage 4-ethylamino-1-[(2'-hydroxyethyl)-amino]-2-nitro-benzene through sulfuric acid splitting off of 4-(N-ethylarylsulfonamido)-1-[(2'-hydroxyethyl)-amino]-2-nitro-benzene.

Process for the production of

A process is disclosed for the production of 4-[ethyl-(2'-hydroxyethyl)-amino]-1-[(2'-hydroxyethyl)-amino]-2-nitrobenze ne, by means of a two-stage technique proceeding from the reaction product of 1,4-diamino-2-nitrobenzene with chloroformic acid chloroethyl ester, or by means of a multiple-stage technique which is based upon an improved process for the production of the pre-stage 4-ethylamino-1-[(2'-hydroxyethyl)-amino]-2-nitrobenzene through sulfuric acid splitting off of 4-(N-ethylarylsulfonamido)-1-[(2'-hydroxyethyl)-amino]-2-nitrobenzene.

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Bensheim, Germany

Isolde Lowe