Title:
FORGERY PREVENTION MEDIUM
Document Type and Number:
Japanese Patent JP2021011067
Kind Code:
A
Abstract:
To provide a forgery prevention medium which can detect the medium is heated by using an ink layer whose color changes at temperature equal to or higher than room temperature, with more alternatives of color types and temperature of color change.SOLUTION: A forgery prevention device 10 comprises: a forgery prevention function layer 3 for preventing forgery by copy; and a concealment ink layer 4 for concealing a heat-sensitive ink layer which can detect that it is heated and a part of the heat-sensitive ink layer, in this order on a base material 5. The heat-sensitive ink layer at least comprises: heat-sensitive ink (A)1 which is transparent at room temperature and irreversibly develops color when it is heated; and heat-sensitive ink (B)2 which has the same color as that of the concealment ink layer at the room temperature and whose color disappears when it is heated. The concealment ink layer is provided by overlapping with a part of the heat-sensitive ink (A) and the heat-sensitive ink (B) in a plan view.SELECTED DRAWING: Figure 1
Inventors:
KONO MITSUKO
GOCHO SATOSHI
GOCHO SATOSHI
Application Number:
JP2019126075A
Publication Date:
February 04, 2021
Filing Date:
July 05, 2019
Export Citation:
Assignee:
TOPPAN PRINTING CO LTD
International Classes:
B42D25/378; B41M3/14
Domestic Patent References:
| JP5966253B2 | 2016-08-10 | |||
| JP2008162184A | 2008-07-17 | |||
| JP2000335148A | 2000-12-05 | |||
| JP2005059423A | 2005-03-10 | |||
| JPS52119397U | 1977-09-09 | |||
| JPH0789215A | 1995-04-04 | |||
| JP2008225081A | 2008-09-25 | |||
| JPH05278372A | 1993-10-26 | |||
| JPH11170697A | 1999-06-29 | |||
| JPWO2015147176A1 | 2017-04-13 |