US 12,085,452 B2
Temperature detection ink, temperature detection ink initialization method, temperature indicator, and article management system
Kohhei Aida, Tokyo (JP); Shunsuke Mori, Tokyo (JP); Kotaro Araya, Tokyo (JP); Shigetaka Tsubouchi, Tokyo (JP); and Masahiro Kawasaki, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 16/963,647
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed Nov. 16, 2018, PCT No. PCT/JP2018/042462
§ 371(c)(1), (2) Date Jul. 21, 2020,
PCT Pub. No. WO2019/142480, PCT Pub. Date Jul. 25, 2019.
Claims priority of application No. 2018-007801 (JP), filed on Jan. 22, 2018.
Prior Publication US 2021/0063252 A1, Mar. 4, 2021
Int. Cl. C09D 11/00 (2014.01); C09D 11/50 (2014.01); C09K 9/02 (2006.01); G01K 11/16 (2021.01)
CPC G01K 11/16 (2013.01) [C09D 11/50 (2013.01); C09K 9/02 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A temperature detection ink, comprising:
a temperature detection material; and
a solvent,
wherein the temperature detection material has a structure in which a thermosensitive material containing a leuco dye, a color-developing agent, and a decolorant is contained in a microcapsule, or a structure in which a phase containing the thermosensitive material is phase-separated from a matrix material,
the thermosensitive material is solidified while being decolored by cooling from a molten state to a glass transition temperature or lower at a predetermined rate or higher,
the thermosensitive material has a glass transition temperature of −20 to 60° C., and
the thermosensitive material has a melting point that is 60 to 250° C. and lower than the boiling point of the solvent.