Transparent isoindoline pigment having a high color strength

US4645539A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Lotsch · Beindersheim, DE
• Georg Henning · Ludwigshafen, DE

Key dates

• Filing date: Jul 26, 1984
• Grant date: Feb 24, 1987
• Expiry date: Jul 26, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B57/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Novel pigmentary forms of isoindoline pigments which contain PA0 (a) a pigmentary form of the compound of the formula (I) ##STR1## and (b) from 2 to 50% by weight, based on (I), of one or more isoindoline pigments of the formula (II) ##STR2## where R is --CN, --CONH.sub.2, N--C.sub.1 -C.sub.4 -alkylcarbamyl, N-phenylcarbamyl, 2-quinazolonyl, 2-quinoxazolonyl and 2-benzimidazolyl, and the phenyl radical in the phenylcarbamyl and/or the heterocyclic radicals stated for R are unsubstituted or substituted, are obtained by heating a mixture of the finely divided pigments (I) and (II) in an aqueous medium. Advantageously, the mixture is prepared directly by synthesizing (I) in the presence of finely divided (II) in water. The novel pigmentary forms are transparent pigments which have high color strength, and whose transparency and color strength are substantially superior to those of very similar pigments.