Process for the preparation of synergistic pigment mixtures

Details Process for the preparation of synergistic pigment mixtures Process for the preparation of synergistic pigment mixtures

C - Chemistry, Metallurgy

09

B

C09B 67/22 (2006.01)

Patent

CA 2135596

A process for the preparation of synergistic mixtures of at least two different pigments of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, isoindolinone, isoindoline, dioxazine, phthalocyanine, diketopyrrolopyrrole or azo series, which comprises mixing at least two compounds of formula A(B)x, (I), wherein x is an integer from 1 to 4, A is the radical of a chromophore of the quinacridone, anthraquinone, perylene, indigo, quinophthalone, isoindolinone, isoindoline, dioxazine, phthalocyanine, diketopyrrolopyrrole or azo series, which contains x N-atoms linked to B, preferably with at least one directly adjacent or conjugated carbonyl group, B is a group of formula Image (II), Image (III) or Image (IV), in powder form by conventional methods and dissolving the mixture in an organic solvent, or first dissolving the individual components in an organic solvent and mixing the - 2 - solutions, and subsequently precipitating the pigment mixture consisting of the corresponding pigments of formula A(H)x, wherein A and x have the meanings given above, from the dissolved mixture by means of a thermal, photolytic or chemical treatment. The substituents and symbols R1, R2, R3, R4, Q, X, Y, Z, m, n and p are as defined in claim 1. Compared with the same pigment mixtures prepared by conventional methods, the pigment mixtures prepared by the process of this invention have surprisingly enhanced properties, including both coloristic as well as fastness properties.

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