A method for producing a halogenated zinc phthalocyanine pigment includes a step of forming a halogenated zinc phthalocyanine crude pigment into a pigment. The halogenated zinc phthalocyanine crude pigment is obtained by deposition of a halogenated zinc phthalocyanine, which is synthesized by using a compound that generates an acid by reacting with water, and the step includes a pretreatment step of heating the halogenated zinc phthalocyanine crude pigment in water to obtain a halogenated zinc phthalocyanine prepigment having a pH of 5.0 or more.

A method for producing a halogenated zinc phthalocyanine pigment includes a step of forming a halogenated zinc phthalocyanine crude pigment into a pigment. The halogenated zinc phthalocyanine crude pigment is obtained by depositing a halogenated zinc phthalocyanine, which is synthesized by using an acidic compound or a compound that generates an acid by reacting with water, and the step includes a pretreatment step of kneading the halogenated zinc phthalocyanine crude pigment along with water.

A method for producing a halogenated zinc phthalocyanine pigment according to one embodiment includes a first step of obtaining a halogenated zinc phthalocyanine crude pigment by deposition by extracting a halogenated zinc phthalocyanine, which is synthesized by using a compound that generates an acid by reacting with water; and a second step of forming the halogenated zinc phthalocyanine crude pigment into a pigment.

There is provided a polyhalogenated zinc phthalocyanine having good tinting strength and being capable of achieving higher brightness when the polyhalogenated zinc phthalocyanine is used in pixel portions of color filters. The object is achieved by providing the polyhalogenated zinc phthalocyanine represented by general formula 1: (wherein in general formula 1, X.sub.1 to X.sub.16 are each independently a chlorine atom, a bromine atom, or a hydrogen atom), in which a value obtained by dividing the maximum ion intensity, measured by mass spectrometry, in an m/z range of 1,780 (inclusive) to 1,820 (exclusive) by the maximum ion intensity in the m/z range of 1,820 (inclusive) to 1,860 (inclusive) is 1.00 or less.

The novel yellow metal azo pigments based on at least three metal azo compounds, which differ at least in the type of metal, have improved colour strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.

The novel yellow metal azo pigments based on at least three metal azo compounds which differ at least in the type of metal have improved colour strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.

The novel yellow metal azo pigments based on at least three metal azo compounds which differ at least in the type of metal have improved colour strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.

The novel yellow metal azo pigments based on at least two metal azo compounds which differ a least in the type of metal have improved colour strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.

The novel yellow metal azo pigments based on at least two metal azo compounds which differ at least in the type of metal have both improved dispersion properties and improved colour strengths and are of excellent suitability for pigmentation of pigment preparations for a broad field of use.

An alkali-resistant pigment composition is provided comprising (a) a C.I. Pigment Yellow 139 and (b) an adduct containing a compound of formula (II) or a tautomeric form thereof, wherein X is O, S or NR.sup.1; Y is O, S or NR.sup.1; the group -A-B— is selected from the group consisting of —CR.sup.2═CR.sup.3-, —CR.sup.4R.sup.5—CR.sup.6R.sup.7-, —CY—CR.sup.8R.sup.9-, —CX—NR.sup.10-, —CR.sup.11═N—, —CR.sup.12R.sup.13-NR.sup.14- and R.sup.1 is hydrogen, C.sub.1-C.sub.8alkyl, C.sub.3-C.sub.7cycloalkyl, C.sub.6-C.sub.10aryl or C.sub.7-C.sub.10aralkyl; R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11, R.sup.12, R.sup.13 and R.sup.14are independently of each other hydrogen, halogen, C.sub.1-C.sub.8alkyl, C.sub.2-C.sub.8alkenyl, or C.sub.6-C.sub.10aryl, or R.sup.2 and R.sup.3 form a benzoannellated ring; and/or a melamine- or pyrimidine-based compound, which is optionally substituted. The pigment composition may be used as colorant in various applications, especially in coloring high molecular weight organic material, for example, coating compositions, paints, printing inks, liquid inks, plastics, films or fibers.

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