Pigment preparations based on diketopyrrolopyrrole pigments for the undistorted pigmentation of partially crystalline plastics

1. A pigment preparation comprising

a) at least one base pigment, wherein the at least one base pigment is at least one diketopyrrolopyrrole pigment of the formula (V),

where

 R 20 , R 21 , R 22 and R 23 are independently hydrogen, halogen, C 1 –C 4 -alkyl, C 1 –C 4 -alkoxy, cyano or phenyl;

and

b) at least one pigment dispersant of the formula (I),

where

 R 31 is a radical of the formula (VI), (VIII) or (IX),

R 32 is a radical of the formula (VII),

s or t is a number from 0.1 to 4.0

n is a number from 0 to 2, with the proviso that n is 0 when R 31 is a radical of the formula (VIII) or (IX),

E + is H + or the equivalent M m+ /m of a metal cation M m+ from the 1st to 5th main group or from the 1st, 2nd or 4th to 8th transition group of the periodic table of chemical elements, m being one of 1, 2 or 3; an ammonium ion N +R 9 R 10 R 11 R 12 , wherein R 9 , R 10 , R 11 and R 12 are each independently a hydrogen atom, C 1 –C 30 -alkyl, C 2 –C 30 -alkenyl, C 5 –C 30 -cycloalkyl, phenyl, (C 1 –C 8 )-alkylphenyl, (C 1 –C 4 )-alkylenephenyl, or a (poly)alkyleneoxy group of the formula —[CH(R 80 )—CH(R 80 )—O] k —H, where k is a number from 1 to 30 and each R 80 is independently hydrogen, C 1 –C 4 -alkyl or, when k is >1, a combination thereof;

and wherein the C 1 -C30-alkyl, C 2 –C 30 -alkenyl, C 5 –C 30 -cycloalkyl, phenyl or (C 1 –C 8 )-alkylphenyl are optionally substituted by amino, hydroxyl and/or carboxyl;

or the substituents R 9 and R 10 combine with the quaternary nitrogen atom to form a five-, six- or seven-membered saturated ring system optionally containing additional heteroatoms selected from the group consisting of O, S and N;

or the substituents R 9 , R 10 and R 11 combine with the quaternary nitrogen atom to form a five-, six- or seven-membered aromatic ring system optionally containing additional heteroatoms selected from the group consisting of O, S and N and optionally, has additional rings fused thereon;

or wherein E + is an ammonium ion of the formula (Ic)

wherein

R 15 , R 16 , R 17 and R 18 are independently hydrogen or a (poly)alkyleneoxy group of the formula —[CH(R 80 )—CH(R 80 )O] k —H, where k is a number from 1 to 30 and each R 80 is independently hydrogen, C 1 –C 4 -alkyl or, when k>1, a combination thereof;

q is a number from 1 to 10;

p is a number from 1 to 5, subject to the proviso that p≦q+1;

T is a branched or unbranched C 2 –C 6 -alkylene radical; or when q is ≦1 T is optionally a combination of branched or unbranched C 2 –C 6 -alkylene radicals;

Z 1 and Z 2 are the same or different and are hydrogen or C 1 –C 30 -alkyl linear or branched C 1 –C 30 -alkenyl linear or branched, wherein the C 1 –C 30 -alkyl and C 1 –C 30 -alkenyl are unsubstituted or halogen, hydroxyl, hydroxycarbonyl or C 1 –C 6 -alkoxy-substituted, wherein the C 1 –C 30 alkenyl radical is optionally singly or multiply unsaturated, with the proviso that Z 1 and Z 2 are not both hydrogen;

and

Q is a radical of a diketopyrrolopyrrole compound of the formula (Ia)

where R 24 , R 25 , R 26 and R 27 are independently hydrogen, halogen, (C 1 –C 4 )-alkyl, (C 1 –C 4 )-alkoxy or cyano.

2. The pigment preparation according to claim 1 wherein s or t is 0.2 to 3.0.

3. The pigment preparation according to claim 1 wherein

Z 1 and Z 2 are the same or different and are each C 2 –C 16 -alkyl,

R 24 and R 26 are each hydrogen and

R 25 and R 27 are each hydrogen, methyl, tert-butyl, chlorine or cyano.

4. The pigment preparation according to claim 1 , wherein the base pigment of the formula (V) has

R 21 and R 23 both hydrogen and

R 20 and R 22 the same or different and each hydrogen, methyl, tert-butyl, chlorine, cyano or phenyl.

5. The pigment preparation according to claim 1 , wherein

the base pigment is C.I. Pigment Orange 71, 73, 81, C.I. Pigment Red 254, 255, 264, 270 or 272.

6. The pigment preparation according to claim 1 , consisting essentially of

a) 50% to 99.9% by weight of at least one base pigment,

b) 0.1% to 25% by weight of at least one pigment dispersant, and

c) 0% to 25% by weight of at least one auxiliary, the fractions of the respective components being based on the 100% weight of the preparation.

7. The pigment preparation according to claim 1 , wherein n is 0 to 0.5.

8. A process for producing a pigment preparation according to claim 1 , comprising the step of adding the at least one pigment dispersant to the at least one base pigment during the manufacture of the at least base pigment, wherein the manufacture of the at least one pigment includes:

synthesizing the at least one base pigment,

dividing the at least one base pigment,

dispersing the at least one base pigment, and

isolating the at least one pigment.

9. The process according to claim 8 , wherein the manufacture of the at least one pigment further comprises finishing the at least one base pigment.

10. The process according to claim 8 , wherein the isolating step of the manufacture of the at least one base pigment further comprises forming the at least one base pigment into a presscake, dry granulate or powder.

11. A pigmented composition comprising a pigment preparation according to claim 1 .

12. The pigmented composition according to claim 11 , wherein pigmented composition is selected from the group consisting of plastics, resins, coatings, paints electrophotographic toners electrophotographic developers and inks.

13. The pigmented composition according to claim 11 , wherein the pigmented composition is a printing ink.

14. A process for warpage-free mass pigmentation of a partly crystalline plastic comprising the step of adding a pigment preparation according to claim 1 to the partly crystalline plastic during the manufacture of the partly crystalline plastic.

15. The process according to claim 14 wherein the partly crystalline plastic is a homopolymer, block copolymer, random copolymer or terpolymer of ethylene, propylene, butylene, styrene, divinylbenzene or mixtures thereof.

16. The process according to claim 14 wherein the partly crystalline plastic is a polyethylene, polypropylene, polystyrene, PVC, polyester, polyamide or a thermoplastic ionomer.

17. The process according to claim 14 , wherein the partly crystalline plastic is HDPE, MDPE, LDPE, polyethylene terephthalate, nylon 6 or nylon 66.

18. A partly crystalline plastic made in accordance with the process of claim 15 .