Basf Farben and Fasern Ag

Basf Lacke+farben Ag

Basf Farben + Fasern Ag

Wolfgang Ruff

Egon Liedek

Gerhard Berger

Hans W Sonneborn

Peter Reiter

Reinhard Kemper

Peter Dimroth

Egon Liedeck

Leonhard Heckl

Disazo compounds based on 4,4'-diaminodiphenyl compounds contain not less than 50% by weight of a disazo compound of the general formula

Disazo compounds and formulations containing same

Novel formulations which contain (a) one or more azo pigments based on coupling products of aromatic monoamines or 4,4'-diaminodiphenyls with acetoacetarylides, 1-arylpyrazolones, 3-hydroxy-2-naphthoic acid derivatives or .beta.-naphthol and (b) one or more dyes of the formula

Pigment formulations

A novel modified diarylide pigment contains (a) a pigment which is composed of a tetrazotized benzidine, coupled to an acetoacetarylide and/or a 1-phenyl-3-methylpyrazole-5-one, and (b) a water-soluble component obtained from a symmetric or asymmetric coupling product of a tetrazotized 4,4'-diamino-2,2'-stilbenedisulfonic acid and an acetoacetarylide and/or a 1-phenyl-3-methyl-5-pyrazolone. The novel pigments possess very good color strength, very good gloss characteristics and very good transparency, and exhibit improved printing characteristics, particularly in offset printing inks.

Modified diarylide pigments and their preparation

A diazo pigment dye having the formula ##STR1## in which R.sub.1 represents a hydrogen, chlorine or bromine atom or a nitro group, and

Diazo pigments

Mixed pigments containing an organic pigment component and an inorganic pigment component imparting improved gloss and other desirable properties to organic coatings containing the same in relatively large amounts are prepared by synthesizing the organic component in the presence of the inorganic component in a liquid medium inert to the inorganic component, such as nickel titanium yellow or chromium titanium yellow.

Mixed pigment and process of preparing the same

The azo dye of the formula ##STR1## is a brilliantly red pigment which imparts lightfast and migration resistant color to printing inks, plastics, and the like.

Growing community of inventors

Stuttgart, Germany

Wolfgang Ruff