Pigment dispersants based on diketopyrrolopyrrole compounds and pigment preparations

A pigment dispersant of the formula (I):

• in which Q is a radical of the diketopyrrolopyrrole compound of the formula (Ia):
• s is a number from 0.1 to 4.0,
• n is 2-s,
• E+ is H+ or the equivalent Mm+/m of a metal cation Mm+ from main groups 1 to 5 or transition groups 1 or 2 or 4 to 8 of the periodic system of the chemical elements, m being 1, 2 or 3, an ammonium ion N+R9R10R11R12, where the substituents R9, R10, R11 and R12 independently of one another are each a hydrogen atom, C1-C30-alkyl, C2-C30-alkenyl, C5-C30-cycloalkyl, phenyl, (C1-C6)-alkyl-phenyl, (C1-C4)-alkylene-phenyl, or a (poly)alkyeneoxy group of the formula —[CH(R80)—CH(R80)—O]k—H, in which k is a number from 1 to 30 and the two radicals R80 independently of one another are hydrogen, C1-C4-alkyl or, if k is >1, a combination thereof;
• and in which alkyl, alkenyl, cycloalkyl, phenyl or alkylphenyl R9, R10, R11, and/or R12 may be substituted by amino, hydroxyl and/or carboxyl;
• or where the substituents R9 and R10, together with the quaternary nitrogen atom, are able to form a five- to seven-membered saturated ring system containing, if desired, further heteroatoms from the group consisting of O, S and N,
• or where the substituents R9, R10 and R11, together with the quaternary nitrogen atom, are able to form a five- to seven-membered aromatic ring system, containing, if desired, further heteroatoms from the group consisting of O, S and N, and to which additional rings may be fused if desired,
• and in which the two radicals Z are identical or different and Z has the definition Z1 or Z4, where
• Z1 is a radical of the formula (Ib):
• —[X—Y]qR3 (Ib)
• in which
• X is a C2-C8-alkylene radical, a C5-C7-cycloalkylene radical, or a combination of these radicals, it being possible for these radicals to be substituted by from 1 to 4 C1-C4-alkyl radicals, hydroxyl radicals, (C1-C4)-hydroxyalkyl radicals and/or by 1 or 2 further C5-C7-cycloalkyl radicals, or in which X, if q is >1, may also be a combination of said definitions;
• Y is a —O—,
• or —NR2— group,
• or in which Y, if q is >1, may also be a combination of said definitions;
• q is a number from 1 to 10;
• R2 and R3 independently of one another are a hydrogen atom, a substituted or unsubstituted, or partly fluorinated or perfluorinated, branched or unbranched (C1-C20)-alkyl group, a substituted or unsubstituted C5-C7-cycloalkyl group or a substituted or unsubstituted, or partly fluorinated or perfluorinated (C2-C20)-alkenyl group, it being possible for the substituents to be hydroxyl, phenyl, cyano, chloro, bromo, amino, C2-C4-acyl or C1-C4-alkoxy, or
• R2 and R3, together with the nitrogen atom, form a saturated, unsaturated or aromatic heteracyclic 5- to 7-membered ring containing, if desired, 1 or 2 further nitrogen, oxygen or sulfur atoms or carbonyl groups in the ring, being substituted if desired by 1.2 or 3 of the radicals OH, phenyl, CN, Cl, Br, C1-C4-alkyl, C1-C4-alkoxy, C2-C4 acyl and carbamoyl, and carrying, if desired, 1 or 2 benzo-fused saturated, unsaturated or aromatic, carbocyclic or heterocyclic rings;
• and where
• Z4 is hydrogen, hydroxyl, amino, phenyl, (C1-C4)-alkylene-phenyl, C6-C7-cycloalkyl or C1-C20-alkyl, it being possible for the phenyl ring, the (C1-C4)-alkylene-phenyl group and the alkyl group to be substituted by one or more substituents from the group consisting of Cl, Br, CN, NH2, OH, C6H5, mono-, di- or tri-C1-C4-alkoxy-substituted C6H6, carbamoyl, C2-C4-acyl and C1-C4-alkoxy, and it being possible for the phenyl ring and the (C1-C4)-alkylene-phenyl group to be substituted by NR2R2, or the alkyl group is perfluorinated or partly fluorinated.