Title:
REVERSIBLE THERMOCHROMIC COMPOSITION, MICROENCAPSULATED PIGMENT USING SAID REVERSIBLE THERMOCHROMIC COMPOSITION, WRITING TOOL, AND TOY
Document Type and Number:
WIPO Patent Application WO/2024/043313
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing: a reversible thermochromic composition that has a non-phenolic structure having a low load on a human body and the environment and that has both excellent color development sensitivity and decoloring property; a writing tool that accommodates the reversible thermochromic composition; and a toy that contains the reversible thermochromic composition. The problem is solved by a reversibly thermochromic composition which contains a color developer that comprises an amino acid or an amino acid derivative each represented by formula (1), a leuco dye and a color change temperature regulator. In formula (1), X's each independently represent a hydrogen atom or a substituent selected from the group consisting of R1-C(=O)-, R2-C(=S)-, R3-NH-C(=O)-, R4-NH-C(=S)-, R5-NH-SO2-, R6-SO2- and R7-SO2-NH-C(=O)-; Y represents an amino acid residue or a peptide group each which may have a substituent and has m N-terminals and n C-terminals; X is bound to an N-terminal of Y and Z is bound to a carbon atom located at an C-terminal of Y, and X and Y each independently represent an OH group or an OR8 group; m represents an integer selected from 1 to 3; and n represents an integer selected from 1 to 3; wherein R1 to R7 each independently represent an alkyl, aryl, aralkyl, alkoxy, aryloxy or aralkyloxy group which may have a substituent, and R8 represents an alkyl, aryl or aralkyl group which may have a substituent.
Inventors:
KAWAI JUNYA (JP)
INADA KEIICHIRO (JP)
KAMEYA FUJIWARA KUMIKO (JP)
HIRATA CHIHIRO (JP)
KINNO KAZUKI (JP)
KATO TAKUMI (JP)
INADA KEIICHIRO (JP)
KAMEYA FUJIWARA KUMIKO (JP)
HIRATA CHIHIRO (JP)
KINNO KAZUKI (JP)
KATO TAKUMI (JP)
Application Number:
PCT/JP2023/030548
Publication Date:
February 29, 2024
Filing Date:
August 24, 2023
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
C09B67/08; B43K7/00; B43K8/02; C09D11/17; C09K9/02
Foreign References:
| JPH09290566A | 1997-11-11 | |||
| JPH09142035A | 1997-06-03 | |||
| JP2021154560A | 2021-10-07 | |||
| JP2022092862A | 2022-06-23 |
Attorney, Agent or Firm:
IP FIRM SHUWA (JP)
Download PDF: