Basf Aktiengesellschaft

Hans Scherer

Wolfgang Lotsch

Gustav Bock

Walter Kurtz

Peter Dimroth

Helmut Junge

Isoindoline compounds of the formula ##STR1## where A is --CN or ##STR2## These compounds are pigments which give brilliant and deep colorations, of good fastness, in plastics and surface coatings.

Isoindoline compound

A process for the preparation of an easily dispersible pigment, of high tinctorial strength, having the formula ##STR1## where A is cyano, carbonamido, N-phenyl or N-(chlorophenyl)-carbonamido or is a 5-membered or 6-membered unsaturated heterocyclic ring fused to a benzene ring and B is a barbituric acid radical, by condensing 1-amino-3-imino-insoindoline with the appropriate cyanomethylene compound at pH&gt;7 and then with barbituric acid at pH 1.5-3.5, in an aqueous medium or in water, at from 20.degree. to 150 C. The process may be used to produce high-hiding or transparent pigments which give brilliant colorations.

Preparation of pigments having improved technological properties

Compounds of the formula ##STR1## in which K is ##STR2## Ar.sup.1 is phenyl; phenyl substituted by chlorine, methoxy, ethoxy, methyl, acetylamino or benzoylamino; or ##STR3## Ar.sup.2 is phenyl; or phenyl substituted by chlorine, methyl or sulfamoyl,

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Weisenheim, Germany

Hans Scherer