PRODUCTION METHOD FOR PIGMENT AQUEOUS DISPERSION

Title:

PRODUCTION METHOD FOR PIGMENT AQUEOUS DISPERSION

Document Type and Number:

WIPO Patent Application WO/2019/131455

Kind Code:

A1

Abstract:

The present invention pertains to: [1] a production method for an aqueous pigment dispersion of polymer particles containing an azomethine metal complex pigment (A), the method comprising a step for subjecting a mixture containing the azomethine metal complex pigment (A), an uncrosslinked aromatic group-containing polymer (b), and water to a dispersion treatment at a cumulative applied energy of 5.0 kWh/kg or less using a media-less disperser; [2] an aqueous pigment dispersion containing an azomethine metal complex pigment (A) and a polymer dispersant (B), wherein, in the absorption spectrum of the aqueous pigment dispersion, the ratio [(A1max)/(A2max)] of the maximum absorbance (A1max) thereof in the wavelength region of not less than 440 nm but less than 465 nm to the maximum absorbance (A2max) thereof in the wavelength region of not less than 420 nm but less than 440 nm is 1.000 or more; and [3] an aqueous ink for inkjet recording which contains the aqueous pigment dispersion.

Inventors:

MITSUYOSHI KANAME (JP)
EGAWA TSUYOSHI (JP)
NAGANO TOMOHIKO (JP)
SHIMIZU YUSUKE (JP)

Application Number:

PCT/JP2018/047084

Publication Date:

July 04, 2019

Filing Date:

December 20, 2018

Export Citation:

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Assignee:

KAO CORP (JP)

International Classes:

C09D17/00; B41J2/01; B41M5/00; C09D11/326; C09B67/08; C09B67/20; C09B67/46

Domestic Patent References:

WO2003081298A1

2003-10-02

Foreign References:

JP2016121237A	2016-07-07
JP2003055590A	2003-02-26
JP2007187890A	2007-07-26
JP2016124969A	2016-07-11
JP2014056079A	2014-03-27
JP2016166326A	2016-09-15
JP2003055590A	2003-02-26
JP2012201710A	2012-10-22

Other References: