Title:
COMPOSITE COLORED PARTICLES
Document Type and Number:
WIPO Patent Application WO/2022/186228
Kind Code:
A1
Abstract:
Provided is an ink composition suited to industrial production that has excellent writing bleeding prevention and scratch resistance. The present invention relates to composite colored particles that include resin particles having a positive charge on the particle surface and pigment particles having a negative charge on the particle surface, made into a composite by the electrostatic interaction of the resin particles and the pigment particles, an aqueous ink composition in which the composite colored particles are dispersed in an aqueous dispersion medium, and a writing instrument equipped with the aqueous ink composition. The present invention also relates to a method for producing composite colored particles that includes a compositing step for mixing a resin emulsion including resin particles having a positive charge on the particle surface and a pigment dispersion including pigment particles having a negative charge on the particle surface.
Inventors:
OGURA KOSUKE (JP)
Application Number:
PCT/JP2022/008691
Publication Date:
September 09, 2022
Filing Date:
March 01, 2022
Export Citation:
Assignee:
MITSUBISHI PENCIL CO (JP)
International Classes:
C09C3/10; B43K7/01; B43K8/02; C09D11/17; C09D17/00
Foreign References:
| JP2005120136A | 2005-05-12 | |||
| JP2006028460A | 2006-02-02 | |||
| JP2020097646A | 2020-06-25 | |||
| JPS63218778A | 1988-09-12 | |||
| JPH06192611A | 1994-07-12 |
Attorney, Agent or Firm:
FUJIMOTO Eisuke et al. (JP)
Download PDF:
Previous Patent: BRUSH ROLLER
Next Patent: BONDING FILM, METHOD FOR EVALUATING SAME, METHOD FOR PRODUCING SEMICONDUCTOR DEVICE AND INTEGRATED D...
Next Patent: BONDING FILM, METHOD FOR EVALUATING SAME, METHOD FOR PRODUCING SEMICONDUCTOR DEVICE AND INTEGRATED D...