METHOD FOR PRODUCING AZO PIGMENT, PIGMENT DISPERSION, COLORING COMPOSITION, METHOD FOR PREPARING INK FOR INKJET RECORDING, COLORING COMPOSITION FOR COLOR FILTER, AND COLOR FILTER

PROBLEM TO BE SOLVED: To provide an azo pigment and a pigment dispersion excellent in color characteristics, such as tinting power and hues, and also excellent in durability, such as light resistance. SOLUTION: This method for producing an azo pigment represented by general formula (1) includes: a s...

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Hauptverfasser: TATEISHI KEIICHI, JINBO YOSHIHIRO, SETO NOBUO, AZUMA MASAHIRO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an azo pigment and a pigment dispersion excellent in color characteristics, such as tinting power and hues, and also excellent in durability, such as light resistance. SOLUTION: This method for producing an azo pigment represented by general formula (1) includes: a step of preparing a solution (A) including an azo compound represented by general formula (1) and an acid or a base or a good solvent including an acid or a base; and a step of precipitating the azo pigment by mixing the solution (A) with a poor solvent, wherein G is a hydrogen atom, an aliphatic group, an aryl group, a heterocyclic group, an acyl group, an aliphatic oxycarbonyl group, a carbamoyl group, an aliphatic sulfonyl group, or an arylsulfonyl group. COPYRIGHT: (C)2011,JPO&INPIT