US4173677A
Expired / Lapsed
US
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Electro-thermosensitive recording materials
Assignee: Sekisui Chemical Co Ltd
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Filing: 1977-06-17
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Granted: 1979-11-06
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Expires: 1997-06-17
Abstract
Abstract An electro-thermosensitive recording material comprising (1) a support at least the surface of which is electrically conductive, and (2) a conductive recording layer formed on the conductive surface of the support, the recording layer containing (a) a film-forming chlorine-containing polymer and (b) dispersed in the polymer, an acid-sensitive leuco dye and at least one zinc compound selected from the group consisting of zinc oxide optionally doped with a different metal, zinc hydroxide, zinc sulfide, zinc carbonate, zinc acrylate and zinc stearate.
Inventors
- 👤 Shiro Nakano
- 👤 Masahiro Hotta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:54
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/20; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
118 words
An electro-thermosensitive recording material comprising: (1) a support at least the surface of which is electrically conductive, and (2) a conductive recording layer formed on the conductive surface of the support, said conductive recording layer containing (a) a film-forming polymer selected from the group consisting of polyvinyl chloride and copolymers of not less than 70 mol % of vinyl chloride, and (b) dispersed in the film-forming polymer, an acid-sensitive leuco dye and at least one zinc compound selected from the group consisting of zinc oxide, zinc hydroxide, zinc sulfide, zinc carbonate, zinc acrylate, zinc stearate and zinc oxide doped with a different metal selected from the group consisting of aluminum, titanium, gallium, germanium, indium, tin, antimony and iron.
Claim 2
Dependent Claim
118 words
An electro-thermosensitive recording material comprising: (1) a support at least the surface of which is electrically conductive, and (2) a conductive recording layer formed on the conductive surface of the support, said conductive recording layer containing (a) a film-forming polymer selected from the group consisting of polyvinyl chloride and copolymers of not less than 70 mol % of vinyl chloride, and (b) dispersed in the film-forming polymer, an acid-sensitive leuco dye and at least one zinc compound selected from the group consisting of zinc oxide, zinc hydroxide, zinc sulfide, zinc carbonate, zinc acrylate, zinc stearate and zinc oxide doped with a different metal selected from the group consisting of aluminum, titanium, gallium, germanium, indium, tin, antimony and iron.
Claim 3
Dependent Claim
20 words
The recording material of claim 1 wherein the film-forming polymer has a degree of polymerization of not more than 800.
Claim 4
Dependent Claim
29 words
The recording material of claim 1 wherein the acid-sensitive leuco dye is selected from the group consisting of leuco dyes of the triphenylmethane, fluorane, phenothiazine, auramine and spiropyran types.
Claim 5
Dependent Claim
78 words
The recording material of claim 1 wherein the acid-sensitive leuco dye is selected from the group consisting of malachite green leuco base, malachite green leuco carbinol, malachite green leuco nitrile, malachite green leuco sulfonyl, crystal violet leuco carbinol, victoria blue leuco carbinol, aniline blue leuco carbinol, methyl violet leuco carbinol, para-rose aniline leuco carbinol, malachite green lactone, crystal violet lactone, methyl violet lactone, rhodamine B lactone, rhodamine B lactam, 3-diethylamino-7-cyclohexylaminofluorane, leuco methylene blue and benzoyl leuco methylene blue.
Claim 6
Dependent Claim
30 words
The recording material of claim 1 wherein the amount of the acid-sensitive leuco dye is at least 1.0 part by weight per 100 parts by weight of the film-forming polymer.
Claim 7
Dependent Claim
30 words
The recording material of claim 1 wherein the amount of the acid-sensitive leuco dye is 2.0 to 300 parts by weight per 100 parts by weight of the film-forming polymer.
Claim 8
Dependent Claim
27 words
The recording material of claim 1 wherein the amount of the zinc compound is at least 0.1 part per 100 parts by weight of the film-forming polymer.
Claim 9
Dependent Claim
29 words
The recording material of claim 1 wherein the amount of the zinc compound is 1.0 to 1,200 parts by weight per 100 parts by weight of the film-forming polymer.
Claim 10
Dependent Claim
18 words
The recording material of claim 1 wherein the zinc compound is zinc oxide doped with said different metal.
Claim 11
Dependent Claim
28 words
The recording material of claim 9 wherein the doped zinc oxide contains 0.03 to 2.0% by weight, based on the weight of zinc oxide, of the different metal.
Claim 12
Dependent Claim
22 words
The recording material of claim 1 wherein the conductive recording layer further contains a fine powdery filler inert to the leuco dye.
Claim 13
Dependent Claim
30 words
The recording material of claim 16 wherein the amount of the fine powdery filler is 50 to 600 parts by weight per 100 parts by weight of the film-forming polymer.
Claim 14
Dependent Claim
23 words
The recording material of claim 1 wherein the conductive recording layer has a penetration electrical resistance of not more than 10 6 ohms.
Claim 15
Dependent Claim
19 words
The recording material of claim 1 wherein the conductive recording layer has a thickness of 5 to 50 microns.
Claim 16
Dependent Claim
22 words
The recording material of claim 1 wherein the support has a surface specific electrical resistance of not more than 10 5 ohms.
Claim 17
Dependent Claim
45 words
The recording material of claim 1 wherein the conductive recording layer further contains an electron donor compound inert to the leuco dye and selected from the group consisting of organic quaternary ammonium salts, amines, pyridinium salts, heterocyclic compounds, condensed ring aromatic hydrocarbons and polyhydric alcohols.
Claim 18
Dependent Claim
30 words
The recording material of claim 16 wherein the amount of the electron donor compound is 0.1 to 50 parts by weight per 100 parts by weight of the film-forming polymer.
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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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |