Quinacridone mixtures, process for their manufacture and their use as pigments
AssigneeHoechst Aktiengesellschaft
InventorsOtto Fuchs, Adolf Kroh
Life of this patent
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Abstract
Compositions of linear trans-quinacridones containing at least one component (I) selected from unsubstituted, chloro- and methyl-substituted quinacridone and at least one component (II) selected from bis-(carbamoyl)-quinacridones, the carbamoyl groups of which are unsubstituted, N-mono-alkyl substituted or N,N-dialkyl-substituted, are pigments useful for coloring plastics and especially lacquers. These compositions are preferably prepared by joint ring closure of the corresponding 2,5-dianilino-terephthalic acids or esters.
Claims18
A composition of matter comprising 30 to 95% of at least one component of the formula (I) ##STR7## wherein R.sup.1 and R.sup.2 are the same or different and each is hydrogen, chlorine or methyl, and 5 to 70% of at least one component of the formula (II) ##STR8## wherein R.sup.3 is --NH--R.sup.4 or --N(R.sup.5).sub.2, R.sup.4 being hydrogen or alkyl of 1 to 6 carbon atoms and R.sup.5 being methyl or ethyl.
Dependencies are inferred from the claim text.