Pigment, process for producing pigment, pigment disperser and powder toner for static charge developing

Abstract

A pigment having weak dispersion force to be readily dispersed in a medium to be colored from which an excellent yellow image having superior transparency can be produced. The pigment includes a compound having the same chemical formula as C.I. Pigment Yellow 180. The BET specific surface area based on the nitrogen absorption process of the pigment is 20-100 m<2> / g, and the ratio of the absolute strength of X-ray diffraction at Bragg angle 2theta=17.5 DEG +-0.2 DEG to the absolute strength of X-ray diffraction at Bragg angle 2theta=18.2 DEG +-0.2 DEG of the pigment in a powder X-ray diffraction diagram using a CuKalpha characteristic X-ray is less than 1.8 / 1.0. The present invention also provides a dispersion including the pigment and a thermoplastic resin having excellent transparency and color strength.

Description

technical field [0001] The present invention relates to an acetoacetate arylate-based disazo pigment useful for various uses, especially in the coloring of inks, paints, plastics, color toners, and color filters, and a pigment dispersion using the same. Background technique [0002] From 2,2'-[1,2-ethylenebis(oxo-2,1-phenylene azo)]bis[N-(2,3-dihydro-2-oxo-1H-benzene C.I. Pigment Yellow 180 composed of imidazol-5-yl)-3-oxo-butyramide (hereinafter referred to as base substance) is known as a useful yellow colorant and can be used in various applications. This basic substance can be obtained by diazo coupling reaction. Since it has a skeleton derived from a benzimidazolone compound, one of its raw materials, it has a high sunlight in the previous yellow colorants composed of disazo yellow pigments. Fastness, improved finish fastness in paints, improved transfer fastness in synthetic resins and high thermal stability. The so-called pigments, relative to the definition of dyes...

AI Technical Summary

Problems solved by technology

[0016] Furthermore, the above-mentioned second step weakens the aggregation by increasing the particle size of the primary particles by growing each particle. As a result, according to the application that emphasizes transparency and coloring power, in the case where high-level requirements are targeted, if deagglomeration can be achieved. In terms of substances that should be called coarse pigments in the classification of the manufacturing process, the original small particle size has favorable results in terms of transparency, etc. However, contrary to the result that the second process can weaken the aggregation, it is better to increase the pigment. The particle size of the primary particle with a large diffraction angle is small, so the performance expected as a colorant cannot be obtained

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