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Patent Searching and Data


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.

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Inventors:
NAKANISHI, Ryo (1334 Minato, Wakayama-sh, Wakayama 80, 〒6408580, JP)
Application Number:
JP2018/024520
Publication Date:
January 10, 2019
Filing Date:
June 28, 2018
Export Citation:
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Assignee:
KAO CORPORATION (14-10, Nihonbashi Kayabacho 1-chome Chuo-k, Tokyo 10, 〒1038210, JP)
International Classes:
C09D17/00; B41J2/01; B41M5/00; C09B67/20; C09D11/326
Foreign References:
JP2006176624A2006-07-06
JP2006124557A2006-05-18
JP2004210951A2004-07-29
JP2007314784A2007-12-06
JP2016160331A2016-09-05
JP2017128723A2017-07-27
Attorney, Agent or Firm:
KATAOKA, Makoto et al. (OHTANI PATENT OFFICE, Toranomon ES Bldg. 7F. 25-2, Toranomon 3-chome, Minato-k, Tokyo 01, 〒1050001, JP)
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