Title:
白色微粒子
Document Type and Number:
Japanese Patent JP7043811
Kind Code:
B2
Abstract:
The present invention relates to white fine particles from which a white ink that is capable of satisfying both of high hiding power and good bending resistance in a printed material can be obtained, and further relates to white fine particles from which an ink that is capable of satisfying not only excellent fixing properties even when printed on a non-liquid absorbing printing medium such as a resin film, but also suppression of increase in viscosity of the ink and at the same time good deinking properties at a high level can be obtained. The present invention provides [1] white fine particles containing titanium oxide and a polymer component with which the titanium oxide is encapsulated, in which a titanium atomic fraction of a surface of the respective white fine particles as measured at a photoelectron takeoff angle of 45° by X-ray photoelectron spectroscopy (XPS) is not more than 7 atomic%, [2] a water-based ink containing the aforementioned white fine particles, in which the titanium atomic fraction of the surface of the respective white fine particles as measured at a photoelectron takeoff angle of 45° by XPS is not more than 5 atomic%, and [3] a process for producing a dispersion of white fine particles, including step 1 of mixing titanium oxide and a polymer dispersant to obtain a titanium oxide dispersion and step 2 of adding a polymerizable monomer to the thus obtained titanium oxide dispersion to subject the polymerizable monomer to polymerization reaction, thereby obtaining the dispersion of the white fine particles, in which a titanium atomic fraction of a surface of the respective white fine particles as measured at a photoelectron takeoff angle of 45° by XPS is not more than 7 atomic%.
Inventors:
Tomohide Yoshida
Ueda Yasushi
Ueda Yasushi
Application Number:
JP2017231091A
Publication Date:
March 30, 2022
Filing Date:
November 30, 2017
Export Citation:
Assignee:
Kao Corporation
International Classes:
C09C3/10; B41J2/01; B41M5/00; C09C1/36; C09C3/06; C09D11/322; C09D17/00
Domestic Patent References:
| JP2002206028A | ||||
| JP2005120365A | ||||
| JP6049109A | ||||
| JP2016044304A | ||||
| JP2012236868A | ||||
| JP2014515765A | ||||
| JP2013522389A | ||||
| JP2011225867A | ||||
| JP2013203975A |
Attorney, Agent or Firm:
Kataoka Makoto
Wataru Sasaki
Wataru Sasaki