This invention is directed to novel bis-(2,4-diaminophenoxy)-alkanes and a method of preparing them. This invention is also directed to the use of said bis-(2-4-diaminophenoxy)-alkanes, or the salts thereof, as coupler components in developer-coupler oxidation hair dyeing compositions.

Novel coupler components for oxidation hair dyes, the manufacture thereof, and hair colorants

This application is a continuation-in-part of our copending application Serial No. 431,172, filed February 16, 1942. The present invention is concerned with valuable new disazo dyestuffs, and a process for preparing the same. The present invention is particularly concerned with direct dyeing...

Disazo dyes from dihydroxy benzidines

The invention relates to the new compounds consisting of N,N'-bis(β-hydroxyethyl)-N,N'-bis(4'-aminophenyl)-1,3-diamino-2-propanol and N,N'-bis(ethyl)-N,N'-bis(4'-amino-3'-methylphenyl)ethylenediamine, and their use in keratinous fiber dyeing compositions and processes.

Aliphatic alpha, omega-diamine compounds and their use in hair dyeing

The present invention is concerned with valuable new tris- and poly-azo-dyestuffs, and a process for preparing the same. The present invention is particularly concerned with direct dyeing cotton dyestuffs (also called substantive dyestuffs), and still more particularly with dyestuffs capable...

Tris and polyazo dyes from tetrazotized 0:0' dihydroxybenzidine

This invention relates to metallized azo dyestuffs. More particularly, it relates to metal complexes of azo dyestuffs with metals of atomic weight from 52-64, represented by the following formula: NH in which R is hydrogen, mononuclear aryl or lower alkyl and A is the residue of a diazotized...

Heinrich Schobel

Papers

Substantive orthooxyazo dyestuffs and a process of making same.

Copper compound of substantive orthooxyazo dyestuff and process of making same.

Substantive orthooxyazo dyestuffs and process of making same.