Pigment dispersants based on diketopyrrolopyrrole compounds and pigment preparations

1. A pigment preparation comprising:

a) at least one organic base pigment, and

b) at least one 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 about 1.7,

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,

or in which E + defines an ammonium ion of the formula (Ic)

in which

R 15 , R 16 , R 17 and R 18 independently of one another are hydrogen or a (poly)alkyleneoxy 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;

q is a number from 1 to 10,

p is a number from 1 to 5, where p is ≦q+1;

T is a branched or unbranched C 2 -C 6 -alkylene radical; or in which T, if q is >1, may also be a combination of branched or unbranched C 2 -C 6 -alkylene radicals;

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 6 -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, by 1 or 2 C 5 -C 7 -cycloalkyl radicals, or in which X, if q is >1, may also be a combination of said definitions;

Y is an —NR 2 group

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

and where

Z 4 is hydrogen.

2. A pigment preparation as claimed in claim 1 , wherein the organic base pigment a) is a perylene, perinone, quinacridone, quinacridonequinone, anthraquinone, anthanthrone, benzimidazolone, disazo condensation, azo, indanthrone, phthalocyanine, triarylcarbonium, dioxazine, aminoanthraquinone, diketopyrrolopyrrole, thioindigo, isoindoline, isoindolinone, pyranthrone, isoviolanthrone or carbon black pigment or a mixture thereof.

3. The pigment preparation as claimed in claim 1 , comprising:

a) from 50 to 99.5% by weight of the at least one base pigment a),

b) from 0.5 to 20% by weight of the at least one pigment dispersant b) of the formula (I),

c) from 0 to 20% by weight of surfactants, and

d) from 0 to 20% by weight of at least one additive,

the fractions of the respective components being based on the overall weight of the preparation.

4. The pigment preparation as claimed in claim 1 , comprising:

a) from 60 to 98.8% by weight of the at least one base pigment a),

b) from 1 to 15% by weight of the at least one pigment dispersant b) of the formula (I),

c) from 0.1 to 15% by weight of surfactants, and

d) from 0.1 to 10% by weight of at least one additive,

the fractions of the respective components being based on the overall weight of the preparation.

5. A process for preparing a pigment preparation as claimed in claim 1 , comprising the step of mixing the at least one pigment dispersant with the at least one base pigment.