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Title:
PROCESS FOR PRODUCING AQUEOUS PIGMENT DISPERSION
Document Type and Number:
WIPO Patent Application WO/2007/029669
Kind Code:
A1
Abstract:
A process for producing an aqueous pigment dispersion which comprises: a first step in which an emulsion composition (A) comprising a water-insoluble polymer having a specific weight-average molecular weight and a salt-forming group, an organic solvent having a specific water solubility, a neutralizing agent, and water is mixed with a pigment (B) to obtain a mixture as a predispersion having a nonvolatile content of 5-50 wt.% and an organic solvent/water ratio of 0.1-0.9 by weight; a second step in which the predispersion is continuously treated with a dispersing-medium type disperser and the resultant treated dispersion is continuously separated from the medium particles; and a third step in which the dispersion is treated with a homogenizer for further dispersing the pigment. Also provided is a water-based ink for ink-jet recording which comprises the aqueous pigment dispersion and gives a print having a high color density and excellent in gloss and marring resistance.

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Inventors:
MATSUMOTO TOSHIYUKI (JP)
ODA TSUYOSHI (JP)
KAMEI KOJI (JP)
IWASAKI TOSHIYA (JP)
Application Number:
PCT/JP2006/317495
Publication Date:
March 15, 2007
Filing Date:
September 05, 2006
Export Citation:
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Assignee:
KAO CORP (JP)
MATSUMOTO TOSHIYUKI (JP)
ODA TSUYOSHI (JP)
KAMEI KOJI (JP)
IWASAKI TOSHIYA (JP)
International Classes:
C09D17/00; B41J2/01; B41M5/00; C09D11/00
Foreign References:
JP2005041992A2005-02-17
JP2005060431A2005-03-10
JP2005048014A2005-02-24
JP2005015550A2005-01-20
JP2004263035A2004-09-24
JP2004131586A2004-04-30
JP2003301122A2003-10-21
JPH07238234A1995-09-12
Other References:
See also references of EP 1935952A4
Attorney, Agent or Firm:
OHTANI, Tamotsu et al. (Bridgestone Toranomon Bldg. 6F. 25-2, Toranomon 3-chome, Minato-k, Tokyo 01, JP)
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