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1. (WO2018124246) AQUEOUS PIGMENT DISPERSION

Pub. No.:    WO/2018/124246    International Application No.:    PCT/JP2017/047123
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: C09D 17/00
C09D 11/023
C09D 11/322
C09D 11/326
C09D 11/38
B41M 5/00
Applicants: KAO CORPORATION
花王株式会社
Inventors: SUZUKI, Yuki
鈴木 勇喜
FUKUDA, Teruyuki
福田 輝幸
KUNII, Satoshi
國井 智史
TANAKA, Satoshi
田中 聡
Title: AQUEOUS PIGMENT DISPERSION
Abstract:
Provided is an aqueous pigment dispersion which has excellent dispersion stability and exhibits excellent ink ejection properties even if used as an ink for inkjet recording. The present invention relates to: [1] an aqueous pigment dispersion which contains a pigment (A), a crosslinked polymer (B) having a carboxy group, and an ethanol amine (C) having an alkyl group and a pKa of 8.7 or more; [2] an aqueous ink which contains this aqueous pigment dispersion, an organic solvent and a surfactant; and [3] a method for producing an aqueous pigment dispersion, which comprises a step (I) wherein a mixture of the pigment (A), the crosslinkable polymer, the ethanol amine (C), an organic solvent and water is subjected to a dispersion process, thereby obtaining a dispersion of polymer particles that contain a pigment wherein the crosslinkable polymer adheres to the pigment (A), a step (II) wherein the organic solvent is removed from the thus-obtained dispersion, thereby obtaining an aqueous dispersion of the polymer particles that contain the pigment, and a step (III) wherein the aqueous dispersion of the polymer particles is subjected to a crosslinking process using a crosslinking agent, thereby obtaining an aqueous pigment dispersion which contains particles of the crosslinked polymer (B) containing the pigment.