Title:
INK COMPOSITION AND WRITING INSTRUMENT
Document Type and Number:
WIPO Patent Application WO/2024/043292
Kind Code:
A1
Abstract:
[Problem] To provide an ink composition having sufficient handwriting density, moderate dischargeability, and good erasability, and a writing instrument comprising said ink composition. [Solution] An ink composition 30 having erasability contains at least colored resin particles having an average particle size of 5-15 μm, a binder resin, and a solvent. The difference between the specific gravity of the colored resin particles and the specific gravity of the components other than the colored resin particles is 0.06-0.7. A film formed by the binder resin enveloping the colored resin particles is formed on the paper surface where the ink composition is discharged.
Inventors:
SHIMIZU SAYAKA (JP)
ITO HITOMI (JP)
YAMAUCHI TAKASHI (JP)
KATO NAOKI (JP)
ITO HITOMI (JP)
YAMAUCHI TAKASHI (JP)
KATO NAOKI (JP)
Application Number:
PCT/JP2023/030403
Publication Date:
February 29, 2024
Filing Date:
August 24, 2023
Export Citation:
Assignee:
FUTURE CREATION & DEV CENTER LLC (JP)
International Classes:
C09D11/17; B43K7/00; B43K7/01; C09D11/18
Domestic Patent References:
| WO2019082722A1 | 2019-05-02 |
Foreign References:
| JP2004143213A | 2004-05-20 | |||
| JP2006045249A | 2006-02-16 | |||
| JP2009227956A | 2009-10-08 | |||
| JP2021031679A | 2021-03-01 | |||
| JP2016124930A | 2016-07-11 | |||
| JP2001172535A | 2001-06-26 | |||
| JP2001314661A | 2001-11-13 |
Attorney, Agent or Firm:
COSMO INTERNATIONAL PATENT FIRM (JP)
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