Patent ID: 7041166
Filing Date: 2006-05-09
Classification: C09B

Abstract:
1. A method for the preparation of a conditioned organic pigment comprising at least a first component selected from the group consisting of 4,4′-diamino-1,1′-dianthraquinonyls, diketo-pyrrolo[3,4-c]pyrroles, triphenedioxazines, indanthrones, perylenes, phthalocyanines and quinacridones, and a second component forming a solid solution or a mixed crystal with the first component, the molar ratio of the first component to the second component in the solid solution or mixed crystal being greater or equal to 1, wherein (1) a pigment suspension of the first component and a pigment suspension of the second component are each formed independently from the other in a liquid reaction medium; (2) the pigment suspension of the first component and the pigment suspension of the second component from step (1) are either separately transferred into separate storage vessels or both pigment suspensions are transferred into a storage vessel; (3) if the liquid medium of the pigment suspension in one or both storage vessels does not already consist of water and optionally an organic liquid in which the amount of organic liquid is from 0 to 50% by weight, based on the total amount of organic liquid and water, the composition of the pigment suspension is so modified by means of the addition of water that the amount of organic liquid is from 0 to 50% by weight, based on the total amount of organic liquid and water; and/or optionally organic liquid is added in such quantity that its total amount does not exceed 50% by weight, based on the total amount of organic liquid and water; (4) the pigment suspension from the storage vessel containing the first component and the pigment suspension from the storage vessel containing the second component, or alternately the suspension from the storage vessel containing both pigment suspensions of step (1), are passed a number of times through an agitated media pearl mill in a circulating or shuttle mode of operation, the agitated media pearl mill having a smaller chamber volume than the volume of the pigment suspension and being operated at a specific power density of at most 2.0 kJ·s (5) optionally, the pigment is isolated by removing the liquid surrounding it.