AQUEOUS PIGMENT DISPERSION, PIGMENT KNEADED PRODUCT, AND PRODUCTION METHOD FOR AQUEOUS PIGMENT DISPERSION

WIPO Patent Application WO/2021/065643

A1

The present invention addresses the problem of providing: an aqueous pigment dispersion in which dispersed objects have a small volume-average particle size and few bulky particles are contained, and that has excellent storage stability; and an aqueous pigment dispersion that can be used to produce an ink having excellent storage stability. The present invention pertains to an aqueous pigment dispersion that contains a pigment (A), and a solvent (B) having less than 5 carbon atoms and 2 or more hydroxy groups, and having a molecular weight of less than 100, the aqueous pigment dispersion being characterized in that the pigment (A) includes, at a proportion [mass of substance eluted from the pigment (A) into toluene/ mass of the pigment (A)] of 0.1 mass% or less, a substance eluted into toluene as measured by a method specified in ISO 6209:2009(E) using a mixture of the pigment (A) and toluene.

KOBAYASHI ATSUO (JP)
GANBAYASHI HIDEKI (JP)

PCT/JP2020/035891

April 08, 2021

September 24, 2020

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DAINIPPON INK & CHEMICALS (JP)

C09C3/08; C09D17/00

WO2018168486A1

2018-09-20

JP2016204516A	2016-12-08
JP2016199653A	2016-12-01
JP2004018759A	2004-01-22
JP2004143316A	2004-05-20
JP2018002798A	2018-01-11

OKADA, KYOICHI: "The state of industrial organic pigment for ink jet.", JOURNAL OF IMAGING SOCIETY OF JAPAN, vol. 49, no. 1, 2010, pages 40 - 47
NOGUCHI, HIROMICHI: "Fine particle dispersion of pigment for ink-jet ink", JOURNAL OF THE JAPAN SOCIETY OF COLOUR MATERIAL, vol. 69, no. 12, 1996, pages 855 - 866

OGAWA Shinji (JP)

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