METHOD FOR PRODUCING ORGANIC PIGMENT COMPOSITION AND PIGMENT DISPERSION

PROBLEM TO BE SOLVED: To provide an organic pigment composition capable of coloring a medium to be colored with better coloring power than ever, by selecting only a surfactant having a specific chemical formula from many betaine-type ampholytic surfactants and using the surfactant together with an o...

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Bibliographische Detailangaben
Hauptverfasser: SHIMADA KATSUNORI, SHOJI FUMIKO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an organic pigment composition capable of coloring a medium to be colored with better coloring power than ever, by selecting only a surfactant having a specific chemical formula from many betaine-type ampholytic surfactants and using the surfactant together with an organic pigment. SOLUTION: This method for producing the organic pigment composition comprises a first process for producing a crude pigment and a second process for pigmentizing the crude pigment obtained from the first process to form the organic pigment and conducts the first process and/or the second process in the presence of the betaine-type ampholytic surfactant so as to produce the organic pigment composition containing the betaine-type ampholytic surfactant and the organic pigment, wherein the betaine-type ampholytic surfactant expressed by formula (1) (R1is an 8-24C aliphatic hydrocarbon residue; and R2and R3are identical to or different from each other, and each H or methyl) is used. A pigment dispersion contains the organic pigment composition obtained by the method for producing the organic pigment composition and a dispersing medium. COPYRIGHT: (C)2004,JPO