Title:
METHOD FOR MANUFACTURING WHITE FINE PARTICLE DISPERSION
Document Type and Number:
WIPO Patent Application WO/2018/123902
Kind Code:
A1
Abstract:
The present invention relates to: a method for manufacturing a white fine particle dispersion whereby a white ink is obtained that is capable of exhibiting excellent opacifying properties, abrasion resistance, and water resistance when printed on a recording medium even when the recording medium has low water absorbency, by inclusion of the white fine particle dispersion in the ink; and a water-based ink for inkjet recording that contains the white fine particles. [1] A method for manufacturing a white fine particle dispersion, having: a step 1 for mixing titanium oxide and a polymer dispersant at a pH equal to or greater than the acid dissociation exponent (pKa) of at least a portion of an acid component of the polymer dispersant and obtaining a titanium oxide dispersion, the isoelectric point (A) of the titanium oxide and the acid dissociation exponent (pKa) of the polymer dispersant (B) satisfying the relationship A – B ≥ 0, the polymer dispersant having constituent units derived from a hydrophobic monomer, and the median particle diameter (D50) of the titanium oxide dispersion being 150-500 nm; and a step 2 for adding a polymerizable monomer to the titanium oxide dispersion obtained in step 1 and performing polymerization, and obtaining a dispersion of white fine particles. [2] A water-based ink for inkjet recording containing the resultant white fine particles.
Inventors:
YOSHIDA TOMOHIDE (JP)
UEDA YASUFUMI (JP)
UEDA YASUFUMI (JP)
Application Number:
PCT/JP2017/046228
Publication Date:
July 05, 2018
Filing Date:
December 22, 2017
Export Citation:
Assignee:
KAO CORP (JP)
International Classes:
C09D17/00; C09D11/326
Foreign References:
| JP2014515765A | 2014-07-03 | |||
| JP2013203975A | 2013-10-07 | |||
| JP2006096930A | 2006-04-13 | |||
| JP2012002978A | 2012-01-05 | |||
| JP2009024165A | 2009-02-05 | |||
| JP2006096930A | 2006-04-13 |
Other References:
S. HAWKETT ET AL., LANGMUIR, vol. 24, 2008, pages 2140 - 2150
F. K. HARTLEYC. BURGESSR. M. ALCOCOK: "The Chemical Society of Japan, Handbook of Chemistry, Pure Chemistry II", 1980, MARUZEN PUBLISHING CO., LTD
F. K. HARTLEYC. BURGESSR. M. ALCOCOK: "The Chemical Society of Japan, Handbook of Chemistry, Pure Chemistry II", 1980, MARUZEN PUBLISHING CO., LTD
Attorney, Agent or Firm:
KATAOKA, Makoto et al. (JP)
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