(19)
(11) EP 1 672 039 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 158(3) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
09.08.2006 Bulletin 2006/32

(43) Date of publication:
21.06.2006 Bulletin 2006/25

(21) Application number: 04748244.3

(22) Date of filing: 29.07.2004
(51) International Patent Classification (IPC): 
C09D 11/00(2006.01)
B41M 5/00(2006.01)
C09D 17/00(2006.01)
 B41J 2/01(2006.01)
C09C 3/10(2006.01)
(86) International application number:
PCT/JP2004/011195
(87) International publication number:
WO 2005/012443 (10.02.2005 Gazette 2005/06)
(84) Designated Contracting States:
DE FR GB IE

(30) Priority: 31.07.2003 JP 2003204620

(71) Applicant: DAINIPPON INK AND CHEMICALS, INC.
Itabashi-ku, Tokyo 174-8520 (JP)

(72) Inventors:
  • OKADA, Shinichi
    Kitaadachi-gun, Saitama 362-0808 (JP)
  • TAKASHIMA, Kyouko
    Kuki-shi, Saitama 346-0111 (JP)
  • HIBINO, Ryouta
    Saitama-shi, Saitama 331-0801 (JP)

(74) Representative: Albrecht, Thomas 
Kraus & Weisert Patent- und Rechtsanwälte Thomas-Wimmer-Ring 15
80539 München
80539 München (DE)

   


(54) AQUEOUS PIGMENT DISPERSION FOR INKJET RECORDING, INK COMPOSITION FOR INKJET RECORDING AND METHOD FOR PRODUCING SAME


(57) A water-based pigment dispersion for ink-jet ink and a method of producing the same, and an ink composition for ink-jet recording comprising the water-based pigment dispersion for ink-jet ink as a main component are provided. A method of producing the water-based pigment dispersion for ink-jet ink comprises a kneading process for kneading a mixture containing a styrene-based resin, a quinacridone-based pigment, a phthalimidomethylated quinacridone-based compound, an alkali metal hydroxide and a humectant to produce a solid and colored kneaded mixture, and a dispersing process for dispersing the solid and colored kneaded mixture in an aqueous medium.