US5919404A
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Reversible thermochromic compositions
Assignee: Pilot Ink Co Ltd
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Filing: 1998-04-20
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Granted: 1999-07-06
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Expires: 2018-04-20
Abstract
Abstract A reversible thermochromic composition comprising as essential components (a) an electron-donating color-developing organic compound, (b) at least one electron-accepting compound selected from alkoxyphenol compounds represented by Formula I: wherein R represents an alkyl group; and (c) a compound serving as a reaction medium capable of reversibly causing electron-donating/accepting reaction attributable to the components (a) and (b). This composition has a reversible metachromatic function that it presents a color-developed state when heated in a color-extinguished state and presents the color-extinguished state when temperature-dropped or cooled in the color-developed state, or that it begins to develop a color in the course of temperature drop after heating, having been triggered by its temperature rise when heated in a color-extinguished state, and returns to the color-extinguished state after it has presented a color-developed state in a maximum developed-color density.
Inventors
- 👤 Katsuyuki Fujita
- 👤 Yoshiaki Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:12
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/287; B41M5/30; B41M5/305; B41M5/333; B41M5/3333; B41M5/3335; B41M5/337; B41M5/3375; C09D; C09D5/00; C09D5/26; B41M5/3372; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A reversible thermochromic composition which develops color when heated and extinguishes color upon temperature decrease comprising; (a) an electron-donating color-developing organic compound; (b) at least one electron-accepting alkoxyphenol compound represented by Formula I: ##STR4## wherein R represents a straight-chain or branched alkyl group having 3 to 18 carbon atoms; and (c) a compound serving as a reaction medium which reversibly causes electron-donating/accepting reaction between the components (a) and (b).
Claim 2
Dependent Claim
69 words
A reversible thermochromic composition which develops color when heated and extinguishes color upon temperature decrease comprising; (a) an electron-donating color-developing organic compound; (b) at least one electron-accepting alkoxyphenol compound represented by Formula I: ##STR4## wherein R represents a straight-chain or branched alkyl group having 3 to 18 carbon atoms; and (c) a compound serving as a reaction medium which reversibly causes electron-donating/accepting reaction between the components (a) and (b).
Claim 3
Dependent Claim
21 words
The reversible thermochromic composition according to claim 1, wherein R is a straight-chain alkyl group having 8 to 12 carbon atoms.
Claim 4
Dependent Claim
32 words
The reversible thermochromic composition according to claim 1, wherein said component (c) contains at least one compound selected from a chain hydrocarbon, an alicyclic hydrocarbon, an aromatic hydrocarbon and a halogenated hydrocarbon.
Claim 5
Dependent Claim
16 words
The reversible thermochromic composition according to claim 1, which is encapsulated in the form of microcapsules.
Claim 6
Dependent Claim
40 words
The reversible thermochromic composition according to claim 1, which has a reversible metachromatic function that the composition presents a color-developed state when heated in a color-extinguished state and presents the color-extinguished state when temperature-dropped or cooled in the color-developed state.
Claim 7
Dependent Claim
23 words
The reversible thermochromic composition according to claim 5, wherein said reversible thermochromic composition is heated at a temperature not higher than 90° C.
Claim 8
Dependent Claim
61 words
The reversible thermochromic composition according to claim 1, which has a reversible metachromatic function that the composition begins to develop a color in the course of temperature drop after heating, having been triggered by its temperature rise when heated in a color-extinguished state, and returns to the color-extinguished state after it has presented a color-developed state in a maximum developed-color density.
Claim 9
Dependent Claim
28 words
The reversible thermochromic composition according to claim 7, wherein said reversible thermochromic composition is heated at a temperature not lower than the melting point of the component-(c) compound.
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