Title:
MANUFACTURING METHOD OF ERASABLE COLORANT AND ERASABLE COLORANT
Document Type and Number:
Japanese Patent JP2008247935
Kind Code:
A
Abstract:
To provide a manufacturing method of an erasable colorant that comprises a colorable compound and exhibits stronger color development.
The manufacturing method of the erasable colorant comprising a colorable compound, a color-developing agent, a first polar solvent having a dielectric constant of at least 7 and a second polar solvent selected between toluene and xylene comprises a step of adding the color-developing agent to the first polar solvent to obtain a mixture and a step of adding the second polar solvent to the mixture to cause the color-developing agent to exist in the state of supersaturation.
Inventors:
SEKIGUCHI YUMIKO
SANO KENJI
TAKAYAMA AKIRA
GOTANDA TAKESHI
SANO KENJI
TAKAYAMA AKIRA
GOTANDA TAKESHI
Application Number:
JP2007087195A
Publication Date:
October 16, 2008
Filing Date:
March 29, 2007
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
C09B67/20; B41M5/337; C09B11/00; C09B57/00; C09B67/46
Attorney, Agent or Firm:
Takehiko Suzue
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto