Title:
REVERSIBLE THERMOCHROMIC MICROCAPSULE PIGMENT
Document Type and Number:
WIPO Patent Application WO/2020/196073
Kind Code:
A1
Abstract:
[Problem] To provide a reversible thermochromic microcapsule pigment that exhibits such reversible thermochromic behavior that the pigment easily turns from a colorless state to a color-developing state when being heated in a living environment temperature range or at or near everyday life temperature, and returns to the colorless state, and also exhibits a high color density when the pigment develops color. [Solution] This reversible thermochromic microcapsule pigment comprises (a) an electron-donating color-developing organic compound, (b) a hydroxyphenyl acetic acid ester compound represented by general formula (1) and serving as an electron-accepting compound, (c) a compound selected from chain hydrocarbons, alicyclic hydrocarbons, and halogenated hydrocarbons, as a reaction mediator that reversibly causes an electron transfer reaction between the component (a) and the component (b), and (d) a styrene-based compound having a softening point of 5°C or higher and a mass-average molecular weight of 200-100,000. (In the formula, R represents a straight-chain or branched alkyl group having 12-22 carbon atoms, X, Y, and Z each independently represent hydrogen or a hydroxy group, and two or three of X, Y, and Z are each a hydroxy group)
Inventors:
FUJITA KATSUYUKI (JP)
Application Number:
PCT/JP2020/011594
Publication Date:
October 01, 2020
Filing Date:
March 17, 2020
Export Citation:
Assignee:
PILOT INK CO LTD (JP)
International Classes:
C09K9/02; C09B11/12; C09B11/26; C09B11/28; C09B67/20
Foreign References:
| JP2017014328A | 2017-01-19 | |||
| JP2000263947A | 2000-09-26 | |||
| JPS5694361A | 1981-07-30 | |||
| US20150165806A1 | 2015-06-18 |
Attorney, Agent or Firm:
NAKAMURA Yukitaka et al. (JP)
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