PRODUCTION METHOD FOR AQUEOUS PIGMENT DISPERSION

Title:

PRODUCTION METHOD FOR AQUEOUS PIGMENT DISPERSION

Document Type and Number:

WIPO Patent Application WO/2019/009170

Kind Code:

A1

Abstract:

The present invention relates to: [1] a method for producing an aqueous pigment dispersion which comprises step 1, in which a monomer (a) having an ionic group and a hydrophobic monomer (b) are polymerized using both a polymerization initiator (x) having an ionic group and a polymerization chain-transfer agent (y) having an ionic group to obtain polymer A having ionic groups, step 2, in which the obtained polymer (A) and a pigment are mixed with and dispersed in an aqueous medium to obtain an aqueous dispersion of the pigment, and step 3, in which the polymer A contained in the obtained aqueous dispersion of the pigment is crosslinked with a polyfunctional compound to obtain said aqueous pigment dispersion; and [2] a method for producing a water-based ink which comprises the steps 1 to 3 and step 4, in which the obtained aqueous pigment dispersion is mixed with an organic solvent to obtain the water-based ink. The obtained aqueous pigment dispersion and water-based ink have such excellent redispersibility and high flowability that the ink ejection nozzle can be inhibited from being clogged by pigment or polymer solidification therein.

More Like This:

JP5546241	Dispersing polymer
JP4183755	Metal pigment component
JP4160304	ink

Inventors:

NAKANISHI RYO (JP)

Application Number:

PCT/JP2018/024520

Publication Date:

January 10, 2019

Filing Date:

June 28, 2018

Export Citation:

Click for automatic bibliography generation Help

Assignee:

KAO CORP (JP)

International Classes:

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

Foreign References:

JP2006176624A	2006-07-06
JP2006124557A	2006-05-18
JP2004210951A	2004-07-29
JP2007314784A	2007-12-06
JP2016160331A	2016-09-05
JP2017128723A	2017-07-27
JP2004210951A	2004-07-29
JP2006176624A	2006-07-06
JP2007314784A	2007-12-06

Other References: