AQUEOUS PIGMENT DISPERSION LIQUID

WIPO Patent Application WO/2020/196082

A1

The present invention provides an aqueous pigment dispersion liquid in which a pigment is finely dispersed; and this aqueous pigment dispersion liquid is not susceptible to change of the viscosity and change of the pigment particle diameters, while having excellent storage stability, and is capable of preparing an emulsion polymerized toner that has adequately controlled particle diameters, while improving the yield of the pigment. The present invention is an aqueous pigment dispersion liquid for emulsion polymerized toners, which contains a pigment, a dispersant and an aqueous medium. The dispersant is a polymer that contains a constituent unit (A) that is derived from a monomer (A) wherein a group containing a (meth)acryloyloxy group or the like is bonded to one end of a specific polyethylene glycol chain or the like, and a constituent unit (B) that is derived from a monomer (B) having a carboxy group or the like; the number average molecular weight of the polymer in terms of polystyrene as determined by gel permeation chromatography is from 4,000 to 15,000; the polymer is contained in a substantially non-ionized state, while having a pH of from 3.0 to 8.4.

SAKAI YOSUKE (JP)
NARITA MISAKI (JP)
YOSHIDA YASUHIRO (JP)
AOYAGI SHINICHIRO (JP)
MURAKAMI YOSHIKAZU (JP)
SHIMANAKA HIROYUKI (JP)

PCT/JP2020/011658

October 01, 2020

March 17, 2020

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DAINICHISEIKA COLOR CHEM (JP)

C09K23/52; C09B57/04; C09B67/20; C09B67/46; C09D17/00; G03G9/09

WO2014091923A1

2014-06-19

JP2014222303A	2014-11-27
JP2012097129A	2012-05-24
JP2013205593A	2013-10-07
JP2010530008A	2010-09-02
JP2006506491A	2006-02-23
JPH1030010A	1998-02-03

KONDO Rieko et al. (JP)

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