abstract |
The invention relates to a pigment preparation which contains the monoazo pigment of the formula (I) n nand 0.1% to 40%, preferably 0.5% to 25%, in particular 1.0% to 17.5% of a pigment dispersant, in relation to the weight of the monoazo pigment of the formula (I), which is composed of disazo compounds at least 30% of the diazo compounds forming an asymmetric disazo compound of the formula (II)n Y-X-A-X-Z (II), nin whichn A is biphenylene, 3,3′-dichlorobiphenylene, 3,3′-dimethoxybiphenylene, 3,3′-dimethylbiphenylene or 2,2′-dichloro-3,3′-dimethoxybiphenylene; X is a group —NH—CO—CH(COCH 3 )—N═N—, —N═N—CH(COCH 3 )—CO—NH—or —N═N—; Y is substituted or unsubstituted phenyl, pyrazolin-5-on-4-yl, 1-phenyl-Pyrazolin -5-on-4-Lyl, 2-hydroxynaphth-1-yl or 2-hydroxy-3-(phenylamino-carbonyl) naphth-1-yl, the substituents being C 1 -C 4 alkyl, C 1 -C 4 alkoxy, nitro, halogen or C 1 -C 4 alkoxycarbonyl, and have the meaning of Y, and the compounds being further substituted with a sulfonic acid group present as an ammonium salt. Y stands for substituted or unsubstituted phenyl, pyrazolin-5-on-4-yl, 1-phenyl-pyrazolin-5-on-4-yl, 2-hydroxynaphth-1-yl or 2-hydroxy-3-(phenylaminocarbonyl)naphth-1-yl, the substituents being C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, nitro, halogen or C 1 -C 4 -alkoxycarbonyl and having the meaning of Y, and the compounds being further substituted with a sulphonic acid group present as an ammonium salt. |