US4620941A
Expired / Lapsed
US
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Thermochromic compositions
Assignee: Sakura Color Products Corp
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Filing: 1984-10-29
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Granted: 1986-11-04
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Expires: 2004-10-29
Abstract
Abstract A thermochromic composition comprising: (i) at least one electron-donating organic chromogenic compound, (ii) at least one compound serving as a color developing material and selected from thiourea and derivatives thereof, guanidine and derivatives thereof, benzothiazole, and benzothiazolyl derivatives represented by the formula ##STR1## wherein A is --H, ##STR2## --NR 2 , --H·NR 3 or --CSNR 2 in which R is H, C 1 -C 10 alkyl, benzyl optionally substituted with C 1 -C 6 alkyl or cyclohexyl optionally substituted with C 1 -C 6 alkyl, with the proviso that all of R in --NR 2 , --H·NR 3 and --CSNR 2 can not be H, and M is Cu, Zn, Fe, Ni, Co or Te, and (iii) and at least one compound serving as a desensitizer and selected from the group consisting of alcohols, esters, ketones, ethers, acid amides, carboxylic acids and hydrocarbons.
Inventors
- 👤 Kimio Yoshikawa
- 👤 Hidetoshi Fukuo
- 👤 Juzo Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:57
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/282; B41M5/284; G01K; G01K11/00; G01K11/12; G01K11/16; Y; Y10; Y10S; Y10S252/00; Y10S252/962
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
138 words
A thermochromic composition comprising: (i) at least one electron-donating organic chromogenic compound, (ii) at least one compound serving as a color developing material and selected from guanidine and derivatives thereof, benzothiazole, and benzothiazolyl derivatives represented by the formula ##STR5## wherein A is --H, ##STR6## --NR 2 , --H·NR 3 or --CSNR 2 in which R is H, C 1 -C 10 alkyl, benzyl optionally substituted with C 1 -C 6 alkyl or cyclohexyl optionally substituted with C 1 -C 6 alkyl, with the proviso that all of R in --NR 2 , --H·NR 3 and --CSNR 2 can not be H, and M is Cu, Zn, Fe, Ni, Co or Te, and (iii) at least one compound serving as a desensitizer and selected from the group consisting of alcohols, esters, ketones, ethers, acid amides, carboxylic acids and hydrocarbons.
Claim 2
Dependent Claim
138 words
A thermochromic composition comprising: (i) at least one electron-donating organic chromogenic compound, (ii) at least one compound serving as a color developing material and selected from guanidine and derivatives thereof, benzothiazole, and benzothiazolyl derivatives represented by the formula ##STR5## wherein A is --H, ##STR6## --NR 2 , --H·NR 3 or --CSNR 2 in which R is H, C 1 -C 10 alkyl, benzyl optionally substituted with C 1 -C 6 alkyl or cyclohexyl optionally substituted with C 1 -C 6 alkyl, with the proviso that all of R in --NR 2 , --H·NR 3 and --CSNR 2 can not be H, and M is Cu, Zn, Fe, Ni, Co or Te, and (iii) at least one compound serving as a desensitizer and selected from the group consisting of alcohols, esters, ketones, ethers, acid amides, carboxylic acids and hydrocarbons.
Claim 3
Dependent Claim
34 words
A thermochromic composition as defined in claim 1 in which the electron donating organic chromogenic compound is at least one compound selected from triphenylmethane phthalides, fluorans, phenothiazines, indolyl phthalides, spiropyrans, leucoauramines and Rhodamine lactams.
Claim 4
Dependent Claim
39 words
A thermochromic composition as defined in claim 1 which contains 0.5 to 100 parts by weight of the color developing material and 5 to 300 parts by weight of the desensitizer, per part of the electron-donating organic chromogenic compound.
Claim 5
Dependent Claim
39 words
A thermochromic composition as defined in claim 3 which contains 1 to 50 parts by weight of the color developing material and 10 to 200 parts by weight of the desensitizer, per part of the electron-donating organic chromogenic compound.
References Cited (Backward Citations)
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US4138357A
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US4473832A
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US4507669A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |