Title:
AQUEOUS INK COMPOSITION FOR WRITING INSTRUMENTS
Document Type and Number:
WIPO Patent Application WO/2023/013721
Kind Code:
A1
Abstract:
Provided are: an aqueous ink composition for writing instruments, which can yield handwriting able to withstand repeated abrasion of handwriting formed by writing and withstand stronger forces of abrasion; and a writing instrument containing said ink composition. This aqueous ink composition for writing instruments is characterized by containing at least: (A) a coloring agent that includes a pigment; (B) olefin-based resin particles; and water. This aqueous ink composition is also characterized in that: the olefin-based resin particles (B) have a penetration hardness of 1 or more and an average particle diameter of 15 µm or less, as measured using a Coulter counter method; and the solid content mass ratio of the coloring agent (A) and the olefin-based resin particles (B) [(A)/(B)] falls within the range 1-100.
Inventors:
KOMETANI AYA (JP)
OGURA KOSUKE (JP)
OGURA KOSUKE (JP)
Application Number:
PCT/JP2022/029897
Publication Date:
February 09, 2023
Filing Date:
August 04, 2022
Export Citation:
Assignee:
MITSUBISHI PENCIL CO (JP)
International Classes:
C09D11/16; B43K7/00; B43K8/02
Foreign References:
| JP2017119800A | 2017-07-06 | |||
| JP2017119839A | 2017-07-06 | |||
| JP2017014315A | 2017-01-19 | |||
| JP2010201752A | 2010-09-16 | |||
| JP2004026926A | 2004-01-29 | |||
| JP2016124179A | 2016-07-11 | |||
| JP2019014769A | 2019-01-31 | |||
| JPH08183923A | 1996-07-16 | |||
| JP2009234093A | 2009-10-15 | |||
| JP2017201000A | 2017-11-09 |
Attorney, Agent or Firm:
FUJIMOTO Eisuke et al. (JP)
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