US4882310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive recording material with heat-sensitive color developing layer containing prismatic calcium carbonate
Assignee: New Oji Paper Co Ltd
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Filing: 1988-10-05
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Granted: 1989-11-21
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Expires: 2008-10-05
Abstract
Abstract An improved heat-sensitive recording material having a substrate and a heat-sensitive recording layer formed thereon which contains a colorless or light-colored basic dye and a color developer to color said basic dye upon contact by heating, said heat-sensitive recording layer being formed by applying a coating dispersion containing prismatic calcium carbonate comprising single particles each having such a particle size that the average length is 1 to 6 mu m and the average breadth is 0.1 to 0.6 mu m. The heat-sensitive recording material does not generate any foreign matter to contaminate the recording head and it does not cause reduction in the whiteness of the recording layer with the lapse of time.
Inventors
- 👤 Naoto Arai
- 👤 Masaharu Nojima
- 👤 Ritsuo Mandoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:50
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3377; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/258
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
An improved heat-sensitive recording material of the type having a substrate and a heat-sensitive recording layer formed thereon which contains a colorless or light-colored basic dye and a color developer to color said basic dye upon contact by heating, characterized in that the heat-sensitive recording layer is formed by applying a coating dispersion containing prismatic calcium carbonate comprising single particles each having such a particle size that the average length is 1 to 6 μm and the average breadth is 0.1 to 0.6 μm.
Claim 2
Dependent Claim
84 words
An improved heat-sensitive recording material of the type having a substrate and a heat-sensitive recording layer formed thereon which contains a colorless or light-colored basic dye and a color developer to color said basic dye upon contact by heating, characterized in that the heat-sensitive recording layer is formed by applying a coating dispersion containing prismatic calcium carbonate comprising single particles each having such a particle size that the average length is 1 to 6 μm and the average breadth is 0.1 to 0.6 μm.
Claim 3
Dependent Claim
30 words
A heat-sensitive recording material according to claim 1, wherein the prismatic calcium carbonate comprises from 5 to 60 wt% of the total amount of solids in the heat-sensitive recording layer.
Claim 4
Dependent Claim
15 words
A heat-sensitive recording material according to claim 1, wherein the prismatic calcium carbonate is calcite.
Claim 5
Dependent Claim
75 words
A heat-sensitive recording material according to claim 1, which further comprises an undercoat layer between the substrate and the heat-sensitive recording layer and/or a protective layer on the heat-sensitive recording layer, said undercoat layer and/or protective layer being formed by applying a coating dispersion containing prismatic calcium carbonate comprising single particles each having such a particle size that the average length is 1 to 6 μm and the average breadth is 0.1 to 0.6 pm.
Claim 6
Dependent Claim
27 words
A heat-sensitive recording material according to claim 1, wherein the color developer is at least one of 4,4'-iso-propylidenediphenol, 4-hydroxy- phenyl-4'-iso-propyloxyphenylsulfone, or an antipyrine complex of zinc thiocyanate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |