Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1992-12-22
1994-11-29
Group, Karl
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106497, 106 23H, 546 49, 546 56, 546 57, 546103, C09B 4800
Patent
active
053686411
ABSTRACT:
A process for the preparation of 2,9-dimethylquinacridone pigments or mixed crystal pigments or mixtures of 2,9-dimethylquinacridone and quinacridones which in the two outer fused benzene rings can be substituted, characterized by the form of their crystalline particles having an average ratio of length to width of <2:1 and an average particle size of <0.4 .mu.m, by adding to the solution of 2,9-dimethylquinacridone before or during the finishing of the corresponding crude quinacridones of the quinacridones mentioned in water or solvent mixtures at temperatures from about 60.degree. to about 200.degree. C., in each case a compound of the general formula (I) ##STR1## in an amount of about 1 to 20% by weight, in which Q is a quinacridone radical which is unsubstituted or substituted, Y is an --NR.sup.4 R.sup.5 group or the radical of a five-, six- or seven-membered heterocycle which contains one to three hetero atoms and can be substituted, R and R' are hydrogen or alkyl, and R.sup.1 to R.sup.5 are hydrogen and/or alkyl or alkylene, and n is a number from 1 to 4, the pigments themselves thus prepared and their use for the pigmenting of natural or synthetic materials and of lacquer systems.
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Dietz Erwin
Kroh Adolf
Group Karl
Hertzog Scott L.
Hoechst AG
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