Pigment dispersants based on diketopyrrolopyrrole compounds and pigment preparations

1. 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 M m+ /m of a metal cation M m+ 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 + R 9 R 10 R 11 R 12 , where the substituents R 9 , R 10 , R 11 and R 12 independently of one another are each a hydrogen atom, C 1 -C 30 -alkyl, C 2 -C 30 -alkenyl, C 5 -C 30 -cycloalkyl, phenyl, (C 1 -C 6 )-alkyl-phenyl, (C 1 -C 4 )-alkylene-phenyl, or a (poly)alkyeneoxy group of the formula —[CH(R 80 )—CH(R 80 )—O] k —H, in which k is a number from 1 to 30 and the two radicals R 80 independently of one another are hydrogen, C 1 -C 4 -alkyl or, if k is >1, a combination thereof;

and in which alkyl, alkenyl, cycloalkyl, phenyl or alkylphenyl R 9 , R 10 , R 11 , and/or R 12 may be substituted by amino, hydroxyl and/or carboxyl;

or where the substituents R 9 and R 10 , 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 R 9 , R 10 and R 11 , 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 Z 1 or Z 4 , where

Z 1 is a radical of the formula (Ib):

—[X—Y] q R 3   (Ib)

in which

X is a C 2 -C 8 -alkylene radical, a C 5 -C 7 -cycloalkylene radical, or a combination of these radicals, it being possible for these radicals to be substituted by from 1 to 4 C 1 -C 4 -alkyl radicals, hydroxyl radicals, (C 1 -C 4 )-hydroxyalkyl radicals and/or by 1 or 2 further C 5 -C 7 -cycloalkyl radicals, or in which X, if q is >1, may also be a combination of said definitions;

Y is a —O—,

or —NR 2 — 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;

R 2 and R 3 independently of one another are a hydrogen atom, a substituted or unsubstituted, or partly fluorinated or perfluorinated, branched or unbranched (C 1 -C 20 )-alkyl group, a substituted or unsubstituted C 5 -C 7 -cycloalkyl group or a substituted or unsubstituted, or partly fluorinated or perfluorinated (C 2 -C 20 )-alkenyl group, it being possible for the substituents to be hydroxyl, phenyl, cyano, chloro, bromo, amino, C 2 -C 4 -acyl or C 1 -C 4 -alkoxy, or

R 2 and R 3 , 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, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 2 -C 4 acyl and carbamoyl, and carrying, if desired, 1 or 2 benzo-fused saturated, unsaturated or aromatic, carbocyclic or heterocyclic rings;

and where

Z 4 is hydrogen, hydroxyl, amino, phenyl, (C 1 -C 4 )-alkylene-phenyl, C 6 -C 7 -cycloalkyl or C 1 -C 20 -alkyl, it being possible for the phenyl ring, the (C 1 -C 4 )-alkylene-phenyl group and the alkyl group to be substituted by one or more substituents from the group consisting of Cl, Br, CN, NH 2 , OH, C 6 H 5 , mono-, di- or tri-C 1 -C 4 -alkoxy-substituted C 6 H 6 , carbamoyl, C 2 -C 4 -acyl and C 1 -C 4 -alkoxy, and it being possible for the phenyl ring and the (C 1 -C 4 )-alkylene-phenyl group to be substituted by NR 2 R 2 , or the alkyl group is perfluorinated or partly fluorinated.

2. The pigment dispersant as claimed in claim 1 , wherein s is a number from 0.2 to 3.0 and n is a number from 0 to 0.5.

3. The pigment dispersant as claimed in claim 1 , wherein

R 2 and R 3 , together with the adjacent nitrogen atom, form an imidazolyl, piperidinyl, morpholinyl, pipecolinyl, pyrrolyl, pyrrolidinyl, pyrazolyl, pyrrolidinonyl, indolyl or piperazinyl ring.

4. The pigment dispersant as claimed in claim 1 , wherein Z 1 has the definition

—[(CH 2 ) 3 —NH] 2 —H, —(CH 2 —CH 2 —NH) 2 H, —(CH 2 ) 3 —NH—(CH 2 ) 2 —NH—(CH 2 ) 3 —NH 2 ,

—(CH 2 ) 3 —N(CH 3 )—(CH 2 ) 3 —NH 2 , —(CH 2 ) 3 —O—(CH 2 ) 2 —O —(CH 2 ) 3 —NH 2 , —(CH 2 ) 3 —O—(CH 2 ) 3 —O—(CH 2 ) 3 —NH 2 , —(CH 2 ) 2 —NH 2 , —(CH 2 ) 3 —NH 2 , —(CH 2 ) 3 —NH—(CH 2 ) 2 —NH 2 , —(CH 2 —CH 2 —NH) 3 —H, —(CH 2 —CH 2 —NH) 4 —H, —(CH 2 —CH 2 —NH) 5 —H, —(CH 2 ) 3 —O—(CH 2 ) 2 —O—(CH 2 ) 2 —O—(CH 2 ) 3 —NH 2 , —(CH 2 ) 3 —O—(CH 2 ) 4 —O—(CH 2 ) 3 —NH 2 ,

—(CH 2 ) 2 —OH, —(CH 2 ) 3 —OH, —CH 2 —CH(CH 3 )—OH, —CH(CH 2 —CH 3 )CH 2 —OH, —CH(CH 2 OH) 2 , —(CH 2 ) 2 —O—(CH 2 ) 2 —OH or —(CH 2 ) 3 —O—(CH 2 ) 2 —O—(CH 2 ) 2 —OH; —(CH 2 ) 2 —NH 2 , —(CH 2 ) 3 —NH 2 , —CH 2 —CH(CH 3 )—NH 2 , —CH 2 —C(CH 3 ) 2 —CH 2 —NH 2 ,

—(CH 2 ) 2 —NH—CH 3 , —(CH 2 ) 2 —N(CH 3 ) 2 ,

—(CH 2 ) 2 —NH—CH 2 —CH 3 , —(CH 2 ) 2 —N(CH 2 —CH 3 ) 2 , —(CH 2 ) 3 —NH—CH 3 . —(CH 2 ) 3 —N(CH 3 ) 2 , —(CH 2 ) 3 —NH—CH 2 —CH 3 or —(CH 2 ) 3 —N(CH 2 —CH 3 ) 2 ,

5. The pigment dispersant as claimed claim 1 , wherein Z 4 has the definition hydrogen, amino, phenyl, benzyl, NR 2 R 3 -substituted phenyl or benzyl, C 1 -C 6 -alkyl, or a C 2 -C 8 -alkyl, phenyl or benzyl substituted by 1 or 2 substituents from the group consisting of hydroxyl, acetyl, methoxy and ethoxy.

6. The pigment dispersant as claimed in claim 1 , wherein X is a C 2 -C 4 -alkylene radical or cyclohexylene.

7. A process for preparing a pigment dispersant as claimed in claim 1 comprising the steps of chlorosulfonating a diketopyrrolopyrrole compound of the formula (Ia):

and reacting the resultant sulfochloride with an amine of the formula (V):

8. A pigment preparation comprising

a) at least one organic base pigment, and

b) at least one pigment dispersant of the formula (I) as claimed in claim 1 .

9. The pigment dispersant as claimed in claim 1 , wherein s is a number from 0.5 to 2.5 and n is a number from 0 to 0.2.