Strong isoindoline pigments, their preparation and use

摘要

A pigmentary form of isoindoline pigments which has high color strength is obtained if these pigments containPP(a) a compound of the formula (I) ##STR1## and (b) one or more isoindoline compounds of the formula (II) ##STR2## and the pigment is obtained by dry- blending (I) and (II) until the primary particles are ≦0.2 &mgr;m and then heating the finished mill base in an organic liquid or in a mixture of water and an organic liquid. In the formulae, X is ##STR3## and R.sup. 2 is --CN, --CONHR.sup.4, 2-quinazolonyl, 2-quinoxazolonyl or 2- benzimidazolyl, R.sup.3 is hydrogen, alkyl or unsubstituted or substituted phenyl, R.sup.1 is hydrogen or methyl, and R.sup.4 is hydrogen, alkyl or phenyl, and the phenyl radical and/or the heterocyclic radicals can be further substituted. The compounds I and II differ from one another.PPThe color strengths of the resulting pigments are substantially superior to the prior art.