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Patent US3936309A successfully refreshed from Google Patents.
US3936309A
Expired / Lapsed
US
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Heat-sensitive recording composition and sheet
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1973-07-18
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Granted: 1976-02-03
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Expires: 1993-07-18
Abstract
Abstract A heat-sensitive recording composition comprising a normally colorless or pale-colored chromogenic substance, a phenolic substance capable of developing the color of said chromogenic substance at an elevated temperature, and a water-soluble binder is not water resistant, but when incorporated with a compound having 2 to 10 1,2-epoxy ring structures O ANGLE >C--C< in one molecule as a hardner for said binder, the composition is rendered highly water resistant. Further, a coating liquid containing the said composition is prevented from coloration, and a recording sheet prepared by coating the said coating liquid on a support is prevented from coloration in texture.
Inventors
- 👤 Isao Kohmura
- 👤 Kiyoshi Futaki
- 👤 Yukio Tahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:05
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3372
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
In a heat-sensitive recording composition comprising a normally colorless or somewhat pale-colored chromogenic substance, a phenolic substance capable of developing the color of said chromogenic substance at an elevated temperature, and a water-soluble binder, the improvement wherein a compound having 2 to 10 1,2-epoxy ring structures ##EQU4## is added as a hardener to the composition.
Claim 2
Dependent Claim
55 words
In a heat-sensitive recording composition comprising a normally colorless or somewhat pale-colored chromogenic substance, a phenolic substance capable of developing the color of said chromogenic substance at an elevated temperature, and a water-soluble binder, the improvement wherein a compound having 2 to 10 1,2-epoxy ring structures ##EQU4## is added as a hardener to the composition.
Claim 3
Dependent Claim
27 words
A composition according to claim 1, wherein the compound having epoxy ring structures is selected from the group consisting of: ##EQU5## ##SPC4## ##EQU6## ##SPC5## ##EQU7## ##SPC6## ##EQU8##
Claim 4
Dependent Claim
27 words
A composition according to claim 1, wherein the amount of the hardener is 0.1 to 30 % by weight based on the weight of the water-soluble binder.
Claim 5
Dependent Claim
27 words
A composition according to claim 1, wherein the amount of the hardener is 0.5 to 20 % by weight based on the weight of the water-soluble binder.
Claim 6
Dependent Claim
19 words
A composition according to claim 1, wherein the phenolic substance has at least two hydroxy groups in one molecule.
Claim 7
Dependent Claim
19 words
A heat-sensitive recording sheet which comprises a support and, coated thereon, the heat-sensitive recording composition defined in claim 1.
Claim 8
Dependent Claim
29 words
A heat-sensitive recording sheet according to claim 6, wherein the compound having epoxy ring structures is selected from the group consisting of: ##EQU9## ##SPC7## ##EQU10## ##SPC8## ##EQU11## ##SPC9## ##EQU12##
Claim 9
Dependent Claim
29 words
A heat-sensitive recording sheet according to claim 6, wherein the amount of the hardener is 0.5 to 30 % by weight based on the weight of the water-soluble binder.
Claim 10
Dependent Claim
29 words
A heat-sensitive recording sheet according to claim 6, wherein the amount of the hardener is 0.5 to 20 % by weight based on the weight of the water-soluble binder.
Claim 11
Dependent Claim
21 words
A heat-sensitive recording sheet according to claim 6, wherein the phenolic substance has at least two hydroxy groups in one molecule.
Claim 12
Dependent Claim
32 words
A composition according to claim 1, wherein the water-soluble binder is selected from the group consisting of polyvinyl alcohol, methyl cellulose, hydroxyethyl cellulose, gum arabic, gelatin, styrene-maleic anhydride copolymer and acrylic resin.
Claim 13
Dependent Claim
26 words
A composition according to claim 11, wherein the amount of the hardener is 0.1 to 30% by weight based on the weight of the water-soluble binder.
Claim 14
Dependent Claim
14 words
A composition according to claim 11, wherein the water soluble binder is hydroxyethyl cellulose.
Claim 15
Dependent Claim
15 words
A composition according to claim 11, wherein the water soluble binder is styrene-maleic anhydride copolymer.
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |