Patent ID: 7626028

Claim:
A method of crystallizing organic pigments, comprising crystallizing an organic pigment in the presence of a compound represented by formula I: wherein A is ═N—; X is methyl or a radical of the formula IIa: Y is an R radical or a radical of the formula IIb: with either X being a radical of the formula IIa or Y being a radical of the formula IIb; R is hydrogen, halogen, C 1 -C 4 -alkyl, —SO 3 H, —SO 3 − Me + , —SO 3 − N + R 1 R 2 R 3 R 4 , —SO 2 NR 1 R 2 , —CH 2 NR 1 R 2 , —CH 2 R 5 , —COOH, —COO − N + R 1 R 2 R 3 R 4 , —COOR 6 or —COR 6 ; R 1 , R 2 , R 3 and R 4 are each independently hydrogen; C 1 -C 22 -alkyl or C 2 -C 22 -alkenyl whose carbon chain may in either case be interrupted by one or more —O—, —S—, —NR 7 —, —CO— or —SO 2 — moieties and/or which may be substituted by one or more of hydroxyl, halogen, aryl, C 1 -C 4 -alkoxy and acetyl; C 3 -C 8 -cycloalkyl whose carbon skeleton may be interrupted by one or more —O—, —S—, —NR 7 — or —CO— moieties and/or which may be substituted by one or more of hydroxyl, halogen, aryl, C 1 -C 4 -alkoxy and acetyl; hydroabietyl, abietyl or aryl; R 1 and R 2 or R 1 , R 2 and R 3 may combine to form a 5- to 7-membered cyclic radical which contains the nitrogen atom and may contain further hetero atoms; R 5 is a radical of the formula IIb′: R 6 is one of the R 1 alkyl radicals; R 7 is hydrogen or C 1 -C 4 -alkyl; Me is an alkali metal ion; Z and Z′ are each independently arylene which may be substituted by one or more of halogen, —SO 3 H, —SO 3 − Me + , —SO 3 − N + R 1 R 2 R 3 R 4 , and C 1 -C 12 -alkyl, and the rings B 1 and B 2 may each be independently additionally substituted by one or more identical or different R radicals other than hydrogen.