Patent US4473831A successfully refreshed from Google Patents.
US4473831A
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US
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Heat sensitive recording paper
Assignee: Fujifilm Holdings Corp
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Filing: 1982-09-29
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Granted: 1984-09-25
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Expires: 2002-09-29
Abstract
Abstract A heat-sensitive recording paper is disclosed. The paper is comprised of a support base, a nearly colorless electron donating dye contained in a dispersion on the base, an organic acid capable of producing a color upon contact with the dye, the organic acid contained in a dispersion on the base, and a phenol compound contained in a dispersion on the base, the phenol compound being represented by the general formula (I) defined within the application. By including the particularly disclosed phenol compound within the heat-sensitive recording paper it is possible to obtain a color image which does not fade when stored even in adverse conditions. Furthermore, the inclusion of the phenol compound does not increase fogging.
Inventors
- 👤 Shojiro Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:47
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3375
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
A heat-sensitive recording paper, comprising: a support base; a nearly colorless electron donating dye contained in a dispersion on the base, wherein the electron donating dye is present in an amount of 10-60 percent by weight based on the weight of an organic acid hereinafter described; an organic acid capable of producing a color upon contact with the dye, the organic acid contained in a dispersion on the base; and a phenol compound contained in a dispersion on the base and present in an amount of 5-200 percent by weight based on the weight of the organic acid, the phenol compound being represented by the general formula (I): ##STR2## wherein R 1 represents a branched alkyl group having 3 to 8 carbon atoms, R 2 represents a hydrogen or a branched alkyl group having 3 to 8 carbon atoms, R 3 represents a hydrogen or an alkyl group having 1 to 3 carbon atoms, R 4 represents a hydrogen or an alkyl group having 1 to 8 carbon atoms, R 5 , R 6 and R 7 each represents a hydrogen or an alkyl group having 1 to 3 carbon atoms, and R 8 represents a hydrogen or an alkyl group having 1 to 8 carbon atoms.
Claim 2
Dependent Claim
207 words
A heat-sensitive recording paper, comprising: a support base; a nearly colorless electron donating dye contained in a dispersion on the base, wherein the electron donating dye is present in an amount of 10-60 percent by weight based on the weight of an organic acid hereinafter described; an organic acid capable of producing a color upon contact with the dye, the organic acid contained in a dispersion on the base; and a phenol compound contained in a dispersion on the base and present in an amount of 5-200 percent by weight based on the weight of the organic acid, the phenol compound being represented by the general formula (I): ##STR2## wherein R 1 represents a branched alkyl group having 3 to 8 carbon atoms, R 2 represents a hydrogen or a branched alkyl group having 3 to 8 carbon atoms, R 3 represents a hydrogen or an alkyl group having 1 to 3 carbon atoms, R 4 represents a hydrogen or an alkyl group having 1 to 8 carbon atoms, R 5 , R 6 and R 7 each represents a hydrogen or an alkyl group having 1 to 3 carbon atoms, and R 8 represents a hydrogen or an alkyl group having 1 to 8 carbon atoms.
Claim 3
Dependent Claim
32 words
A heat-sensitive recording paper as claimed in claim 1, wherein the compound represented by the general formula (I) is a compound selected from the group consisting of 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane, 1,1,3-tris(2-ethyl-4-hydroxy-5-tert-butylphenyl)butane, 1,1,3-tris(3,5-di-tert-butyl-4-hydroxyphenyl)butane and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)propane.
Claim 4
Dependent Claim
37 words
A heat-sensitive recording paper as claimed in claim 1 wherein the compound represented by the general formula (I) is present in an amount of 20 to 100% by weight based on the weight of the organic acid.
Claim 5
Dependent Claim
32 words
A heat-sensitive recording paper as claimed in any of claims 1 or 2, wherein the dye, organic acid, and phenol compound are contained within an aqueous dispersion containing a water-soluble high polymer.
Claim 6
Dependent Claim
30 words
A heat-sensitive recording paper as claimed in claim 4, wherein the water-soluble high polymer is a compound selected from the group consisting of polyvinyl alcohol, hydroxyethyl cellulose and starch derivatives.
References Cited (Backward Citations)
JPS559827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |