US5558700A
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Reversible thermochromic composition
Assignee: Pilot Ink Co Ltd
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Filing: 1994-12-23
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Granted: 1996-09-24
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Expires: 2014-12-23
Abstract
Abstract A reversible thermochromic composition develops fluorescent color of yellow, yellowish orange, orange, reddish orange, or red with a high color density and high color brightness, yet gives no residual color under non-color-developing conditions, and has remarkably improved light resistance. The reversible thermochromic composition, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from pyridine types, quinazoline types, and bisquinazoline types of compound, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.
Inventors
- 👤 Yutaka Shibahashi
- 👤 Jun Sugai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:51
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/305; C; C09; C09K; C09K9/00; C09K9/02; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
69 words
A reversible thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from the group consisting of, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.
Claim 2
Dependent Claim
69 words
A reversible thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of three components of (a) an electron-donating color-developing organic compound selected from the group consisting of, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, and (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range.
Claim 3
Dependent Claim
91 words
A thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of four components of (a) an electron-donating color-developing organic compound selected from the group consisting of pyridine, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range, and (d) one or more light stabilizer selected from UV absorbers, antioxidants, singlet oxygen quenchers, superoxide anion quenchers, ozone quenchers, and infrared absorbers.
Claim 4
Dependent Claim
91 words
A thermochromic composition which develops fluorescent colors, comprising a solubilized mixture of four components of (a) an electron-donating color-developing organic compound selected from the group consisting of pyridine, quinazoline, and bisquinazoline compounds, (b) an electron-accepting compound for the electron-donating color-developing organic compound, (c) a compound serving as a reaction medium for causing reversibly an electron exchange reaction between the components (a) and (b) within a specified temperature range, and (d) one or more light stabilizer selected from UV absorbers, antioxidants, singlet oxygen quenchers, superoxide anion quenchers, ozone quenchers, and infrared absorbers.
Claim 5
Dependent Claim
44 words
The reversible thermochromic composition according to claim 2, wherein the light stabilizer (d) is a combination of a UV absorber and one or more other stabilizers selected from the group consisting of antioxidants, singlet oxygen quenchers, superoxide anion quenchers, ozone quenchers, and infrared absorbers.
Claim 6
Dependent Claim
51 words
The reversible thermochromic composition according to claim 1, wherein the component (b), an electron accepting compound, is selected from the group consisting of compounds having a phenolic hydroxy group and metallic salts thereof, and the components (c) is a compound selected from the group consisting of alcohols, esters, ketones, and ethers.
Claim 7
Dependent Claim
51 words
The reversible thermochromic composition according to claim 2, wherein the component (b), an electron accepting compound, is selected from the group consisting of compounds having a phenolic hydroxy group and metallic salts thereof, and the component (c) is a compound selected from the group consisting of alcohols, esters, ketones, and ethers.
Claim 8
Dependent Claim
14 words
The thermochromic composition according to claim 1, wherein the composition is enclosed in microcapsules.
Claim 9
Dependent Claim
14 words
The thermochromic composition according to claim 2, wherein the composition is enclosed in microcapsules.
Claim 10
Dependent Claim
14 words
The thermochromic composition according to claim 3, wherein the composition is enclosed in microcapsules.
Claim 11
Dependent Claim
14 words
The thermochromic composition according to claim 4, wherein the composition is enclosed in microcapsules.
Claim 12
Dependent Claim
14 words
The thermochromic composition according to claim 5, wherein the composition is enclosed in microcapsules.
Claim 13
Dependent Claim
29 words
The thermochromic composition according to claim 1, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 14
Dependent Claim
29 words
The thermochromic composition according to claim 2, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 15
Dependent Claim
29 words
The thermochromic composition according to claim 3, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 16
Dependent Claim
29 words
The thermochromic composition according to claim 4, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 17
Dependent Claim
29 words
The thermochromic composition according to claim 5, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 18
Dependent Claim
29 words
The thermochromic composition according to claim 6, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 19
Dependent Claim
29 words
The thermochromic composition according to claim 7, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 20
Dependent Claim
29 words
The thermochromic composition according to claim 8, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 21
Dependent Claim
29 words
The thermochromic composition according to claim 9, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
Claim 22
Dependent Claim
29 words
The thermochromic composition according to claim 10, wherein the reversible thermochromic composition changes color with a hysteresis width of from 8° C. to 30° C. in color density-temperature curve.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-24 | 2000-03-25 | 2000-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-24 | 2004-03-25 | 2004-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-24 | 2008-03-25 | 2008-09-24 | $7700.00 | Window Closed / Lapsed |