Composition, useful for pigmenting e.g. inks, comprises bis-(chloro-phenyl)-dihydro-pyrrolopyrrole-1,4-dione, biphenyl-4-yl-(chloro-phenyl)-dihydro-pyrrolopyrrole-1,4-dione- and bis-biphenyl-4-yl-dihydro-pyrrolopyrrole-1,4-dione- compound

摘要

Pigment composition (T) comprises 3,6-bis-(4-chloro-phenyl)-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione (I), 3-biphenyl-4-yl-6-(4-chloro-phenyl)-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione compound (II) and 3,6-bis-biphenyl-4-yl-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione compound (III), where: the average particle size of the (T) is 10-60 nm; and (T) is obtained by reacting 1 mole of succinic acid diester with 2 moles of a mixture of 4-chlorobenzonitrile and a biphenyl-4-carbonitrile group (IV). Pigment composition (T) comprises 3,6-bis-(4-chloro-phenyl)-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione (I), 3-biphenyl-4-yl-6-(4-chloro-phenyl)-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione compound of formula (II) and 3,6-bis-biphenyl-4-yl-2,5-dihydro-pyrrolo[3,4-c]pyrrole-1,4-dione compound of formula (III), where: the average particle size of (T) is 10-60 nm, and the particle size of less than 5 vol.% of (T) is greater than 70 nm; and (T) is obtained by reacting 1 mole of succinic acid diester with 2 moles of a mixture of 4-chlorobenzonitrile and a biphenyl-4-carbonitrile group of formula (IV); and the molar ratio of 4-chlorobenzonitrile and (IV) in the nitrile mixture is 99.5:0.5-85:15. X : OH, F, Cl, Br, CN, CF 3, NO 2, 1-8C-alkyl, 5-7C-cycloalkyl, 2-8C-alkenyl, 1-8C-alkoxy, phenyl or benzyl; and n : 0-4, preferably 0. An independent claim is included for the preparation of (T) comprising reacting one a mixture of (I), (II) and (III) before, during and/or after a fine distribution, or during and/or after a final treatment with an uncoated, sulfo group containing monoazo dye and optionally a pigment disperser. [Image].