Title:
AQUEOUS INK COMPOSITION FOR WRITING INSTRUMENTS
Document Type and Number:
WIPO Patent Application WO/2015/166901
Kind Code:
A1
Abstract:
Provided is an aqueous ink composition for writing instruments, whereby, without losing long-term stability or writing performance, issues such as intentional or unintentional written lines or alteration of records that are caused by thermochromic colorants can be easily determined by an photochromic colorant, said aqueous ink composition for writing instruments being suitable for applications such as history verification, forgery prevention, authentication, and hidden messages. The aqueous ink composition for writing instruments is characterized by: containing at least a thermochromic microcapsule pigment and a photochromic microcapsule pigment; having properties whereby the photochromic microcapsule pigment is colorless in an indoor illuminated environment and emits color in an ultraviolet irradiation environment; the average particle diameter of the thermochromic microcapsule pigment and the photochromic microcapsule pigment being 0.2-3 µm; and the average particle diameter of both having the average particle diameter of at least 50% of particles having a large average particle diameter.
Inventors:
ICHIKAWA SHUJI (JP)
OGURA KOUSUKE (JP)
OGURA KOUSUKE (JP)
Application Number:
PCT/JP2015/062664
Publication Date:
November 05, 2015
Filing Date:
April 27, 2015
Export Citation:
Assignee:
MITSUBISHI PENCIL CO (JP)
International Classes:
C09D11/17; B43K7/00; B43K8/02
Foreign References:
| JP2007063433A | 2007-03-15 | |||
| JP2005314659A | 2005-11-10 | |||
| JP2006103212A | 2006-04-20 | |||
| JP2014218559A | 2014-11-20 |
Attorney, Agent or Firm:
FUJIMOTO Eisuke et al. (JP)
Eisuke Fujimoto (JP)
Eisuke Fujimoto (JP)
Download PDF:
Previous Patent: SOLID-STATE IMAGE PICKUP DEVICE AND IMAGE PICKUP APPARATUS
Next Patent: AFTERBURNER AND AIRCRAFT ENGINE
Next Patent: AFTERBURNER AND AIRCRAFT ENGINE