Pigment preparations based on PY 155

Abstract

The invention concerns a pigment preparation based on C.I. Pigment Yellow 155, containing 0.1% to 50% by weight, based on the weight of C.I. Pigment Yellow 155, of at least one pigment dispersant from the group of monoazo or disazo pigments substituted with at least one sulfonic acid group, characterized in that it has a chroma C greater than 53 in the CIELAB system in a solventborne alkyd melamine varnish comprising a 6.7% by weight concentration of the pigment preparation, and/or in that it has a chroma C greater than 35 in the CIELAB system in an aqueous base varnish system in a white reduction comprising a 0.2% by weight concentration of the pigment preparation in white reduction.

Description

Claims

1) A pigment preparation based on C.I. Pigment Yellow 155, comprising C.I. Pigment Yellow 155 and 0.1% to 50% by weight, based on the weight of C.I. Pigment Yellow 155, of at least one pigment dispersant selected from the group consisting of monoazo sand disazo pigments, wherein the at least one pigment dispersant is substituted with at least one sulfonic acid group, and wherein the at least one pigment dispersant has at least one characteristic of a chroma C greater than 53 in the CIELAB system in a solventborne alkyd melamine varnish comprising a 6.7% by weight concentration of the pigment preparation, or b) a chroma C greater than 35 in the CIELAB system in an aqueous base varnish system in a white reduction comprising a 0.2% by weight concentration of the pigment preparation in white reduction.

2) A pigment preparation according to claim 1, containing 0.5% to 20% by weight of the at least one pigment dispersant.

3) A pigment preparation according to claim 1, wherein the at least one pigment dispersant has at least one characteristic of a) a chroma C greater than 55 in the solventborne alkyd melamine varnish or b) greater than 36 in the aqueous base varnish system in white reduction.

4) A pigment preparation according to claim 1, a wherein the at least one pigment dispersant has at least one characteristic of a) chroma C greater than 57 in the solventborne alkyd melamine varnish or b) greater than 37 in the aqueous base varnish system in white reduction.

5) A pigment preparation according to claim 1 wherein the at least one pigment dispersant is a compound of the formula (II)

6) A pigment preparation according claim 1, wherein the at least one pigment dispersant is a compound of the formula (V)

7 ) A pigment preparation according to claim 1, wherein the at least one pigment dispersant is a compound of the formula (VI)

8) A pigment preparation according to claim 1, wherein the at least one pigment dispersant is a compound of the formula (VII)

9 ) A process for producing a pigment preparation according to claim 1, comprising the step of heating a PY 155 crude pigment in a mixture of water and an organic solvent having a boiling point of above 100° C., at an alkaline pH, and in the presence of 0.1% to 50% by weight, based on the weight of C.I. Pigment Yellow 155, of the pigment dispersant to a temperature of above 60° C.

10) A process according to claim 9, wherein the organic solvent is an aromatic solvent.

11) A process according to claim 9, wherein the organic solvent is selected from the group consisting of chlorobenzene, bromobenzene, dichlorobenzenes and trichlorobenzenes.

12) A process according to claim 9, wherein the heating is to a temperature of above 90° C.

13) A process according to claim 9, wherein the pH is not less than 9.

14) (canceled)

15) A process for pigmenting macromolecular organic material comprising the step of adding a pigment preparation according to claim 1 to the macromolecular organic material during manufacture of the macromolecular organic material.

16) The use rocess according to claim 18 wherein the liquid ink is an ink jet ink.

17) A pigment preparation according to claim 7, wherein n is 2.

18) The process according to claim 15, wherein the macromolecular organic material is selected from the group consisting of plastics, resins, coatings, paints, electrophotographic toners, electrophotographic developers, electret materials, color filters, liquid inks, printing inks and seed.

19) A macromolecular organic material made in accordance with the process of claim 15.

20) A macromolecular organic material made in accordance with the process of claim 18.