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Title:
REVERSIBLY THERMOCHROMIC COMPOSITION, WRITING UTENSIL USING SAID REVERSIBLY THERMOCHROMIC COMPOSITION, AND TOY
Document Type and Number:
WIPO Patent Application WO/2022/255256
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing: a reversibly thermochromic composition which achieves a good balance between excellent color developing sensitivity and decoloring properties, while having a non-phenolic structure that places little burden on the human body or the environment; a writing utensil which contains this reversibly thermochromic composition; and a toy which comprises this reversibly thermochromic composition.　The problem is solved by a reversibly thermochromic composition which contains a color developer that contains a compound represented by formula (1), a leuco dye and a color change temperature regulator. (In formula (1), a, a', b, A, A' and X are as follows: a represents an integer selected from among 0 to 5; a' represents an integer selected from among 0 to 5; b represents 0 or 1; X represents -C(=Y)- or -SO2-; the sum of a and a' is not less than 1; each of A and A' independently represents an electron-withdrawing group or a hydrogen-bonding group; and Y represents O or S. Meanwhile, a benzene ring in formula (1) may have a substituent other than A and A'.)

Inventors:
KAWAI JUNYA (JP)
INADA KEIICHIRO (JP)
UEHARA HISATOSHI (JP)
KOBAYASHI TAKAO (JP)
Application Number:
PCT/JP2022/021769
Publication Date:
December 08, 2022
Filing Date:
May 27, 2022
Export Citation:
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Assignee:
MITSUBISHI CHEM CORP (JP)
International Classes:
B41M5/28; B41M5/333; B41M5/337
Domestic Patent References:
WO2018193680A12018-10-25
Foreign References:
JP2000343833A2000-12-12
US4623391A1986-11-18
JPH10315634A1998-12-02
JPH0867665A1996-03-12
JPH11208123A1999-08-03
JPH10272842A1998-10-13
JPH0292579A1990-04-03
JPS62238789A1987-10-19
JP2005213361A2005-08-11
JPS62140881A1987-06-24
JPS6279283A1987-04-11
JPS62101684A1987-05-12
JP2679459B21997-11-19
JP4601174B22010-12-22
JP5887423B22016-03-16
JP6851787B22021-03-31
Other References:
RYOJI NOYORI ET AL.: "Daigakuin Kogi Yuki Kagaku", June 1999, TOKYO KAGAKU DOJIN PUBLISHING CO., LTD., pages: 175
JOURNAL OF AMERICAN CHEMICAL SOCIETY, vol. 138, 2016, pages 13314 - 13325
ORG. LETT., vol. 18, 2016, pages 3726 - 3729
Attorney, Agent or Firm:
IP FIRM SHUWA (JP)
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