Asymmetric 1:2 chromium complexes of monoazo compounds having 1-aryl-3-methyl-pyrazolone-5 coupling components

Abstract

Asymmetric 1:2 chromium complexes of the formula ##STR1## in which R.sub.1 signifies a hydrogen or halogen atom or a nitro group, R.sub.2 signifies a hydrogen or halogen atom, a nitro or sulpho group, R.sub.3 signifies a hydrogen or halogen atom, or a lower alkyl radical, R.sub.4 signifies a hydrogen or halogen atom, a lower alkyl radical or a sulpho group, Each of R.sub.5, R.sub.6 and R.sub.7, independently, signifies a hydrogen or halogen atom or a lower alkyl radical, R signifies a hydrogen atom or a lower alkyl radical, and M.sup.+ signifies a cation, With the provisos I. the radicals R.sub.1 and R.sub.2 occupy the 4- and 6-positions, Ii. where R.sub.4 signifies a sulpho group one of the radicals R.sub.1 and R.sub.2 signifies a halogen atom or a nitro group in the 4-position, and Iii. the compounds contain a single sulpho group which is in free acid or salt form, for natural and synthetic polyamides, natural and regenerated cellulose, polyurethanes, basically modified polyolefins, leather and metals such as anodized aluminum. The dyes possess notable fastness to light, wet treatments, ironing, solvents, rubbing, chlorine, carbonizing and decatizing and build up evenly from neutral dyebaths on polyamides.

Dependencies are inferred from the claim text.