METHOD FOR PRODUCING QUINACRIDONE SOLID-SOLUTION PIGMENT, PIGMENT DISPERSION, AND INK-JET INK

WIPO Patent Application WO/2019/187058

A1

The present invention relates to a technique for providing a quinacridone solid-solution pigment which gives colored objects having a high chroma and a moderate yellowish hue, preferably a quinacridone solid-solution pigment having a controlled particle diameter and the desired hue. Provided is a method for producing a quinacridone solid-solution pigment, the method comprising: subjecting a diarylaminoterephthalic acid and a dialkylarylaminoterephthalic acid to co-cyclization in polyphosphoric acid to obtain a crude quinacridone solid-solution, which is a water-containing solid solution between an unsubstituted quinacridone and a 2,9-dialkylquinacridone, which are contained in a mass ratio of 85/15 to 60/40; drying the obtained water-containing crude quinacridone solid-solution in a drying step to obtain a powdery crude quinacridone solid-solution having a water content less than 1%; and heating the powdery crude quinacridone solid-solution in a liquid medium in which the crude quinacridone solid-solution does not dissolve, in a pigment formation step. Also provided are a pigment dispersion and an ink-jet ink which each contain the obtained quinacridone solid-solution pigment.

KAMATA NAOTO (JP)
YOSHIKAWA SACHIO (JP)

PCT/JP2018/013788

October 03, 2019

March 30, 2018

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DAINICHISEIKA COLOR CHEM (JP)

C09B67/20; C09B48/00; C09B67/22; C09B67/46; C09D11/322; C09D17/00

WO2018079239A1

2018-05-03

JPS6035055A	1985-02-22
JP2007119774A	2007-05-17
JPS5823858A	1983-02-12
JPH1030062A	1998-02-03
JP2005255880A	2005-09-22
JP2000281930A	2000-10-10
JP2002146224A	2002-05-22

See also references of EP 3778784A4

KONDO Rieko et al. (JP)

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