PIGMENT PREPARATION BASED ON AN AZO PIGMENT

摘要

The invention relates to a pigment preparation which contains the mono-azo pigment of formula (1) and 0.1 to 40 % by weight, preferably 0.5 to 25 % by weight, in particular 1.0 to 17.5 % by weight, of a pigment dispersant, in relation to the weight of the mono-azo pigment of formula (I), which is composed of disazo compounds, at least 30 % by weight of the disazo compounds forming an asymmetrical disazo compound of formula Y - X - A - X - Z (II), in which A stands for biphenylene, 3,3'-dichlorobiphenylene, 3,3'-dimethoxybiphenylene, 3,3'-dimethylbiphenylene or 2,2'-dichloro-3,3'-dimethoxybiphenylene; X stands for a -NH-CO-CH(COCH3)-N=N-, -N=N-CH(COCH3)-CO-NH- or -N=N- group; 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 C₁-C₄-alkyl, C₁-C₄-alkoxy, nitro, halogen or C₁-C₄-alkoxycarbonyl and having the meaning of Y, and the compounds being further substituted with a sulphonic acid group present as an ammonium salt.