METHOD FOR PRODUCING DICHLORODIKETOPYRROLOPYRROLE PIGMENT COMPOSITION, DICHLORODIKETOPYRROLOPYRROLE PIGMENT COMPOSITION, COLORING COMPOSITION FOR COLOR FILTER, AND COLOR FILTER

PROBLEM TO BE SOLVED: To provide a method for producing a pigment composition comprising a dichlorodiketopyrrolopyrrole pigment excellent in fineness and with a crystalline form converted into an α type modification, which makes it possible to provide a coloring composition for a color filter, havin...

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Bibliographische Detailangaben
Hauptverfasser: FUJINO TAKUYA, YOSHIZAWA TOSHIHIRO, YAMAMOTO YUICHI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method for producing a pigment composition comprising a dichlorodiketopyrrolopyrrole pigment excellent in fineness and with a crystalline form converted into an α type modification, which makes it possible to provide a coloring composition for a color filter, having high brightness, high contrast ratio, and low viscosity.SOLUTION: Provided is a method for producing a dichlorodiketopyrrolopyrrole pigment composition, wherein, by kneading a crude dichlorodiketopyrrolopyrrole pigment having both an α type modification and a type modification, and at least one of a resin (B) and a resin type dispersant (C) by using a biaxial extruder type kneading apparatus, a type modification is converted into an α type modification.