US5362549A
Expired / Lapsed
US
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Thermal transfer sheet
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1993-02-04
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Granted: 1994-11-08
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Expires: 2013-02-04
Abstract
Abstract A thermal transfer sheet which is capable of preventing ground staining, trailing, etc., at the time of printing and has been improved in image density, resolution, etc., is provided by forming a sensitizing layer having a lower melt viscosity than an ink layer between the ink layer and a substrate film, even when such a thermal transfer sheet is used for an n-fold recording mode. Further, a thermal transfer sheet suitable for an n-fold recording mode which is capable of uniformly transferring an ink layer, is capable of preventing white dropout, ground staining, trailing, etc., at the time of printing, and has been improved in image density, resolution, etc., is provided by forming a surface layer on the surface of the ink layer, and forming the ink layer and surface layer so that the ink layer has a melt viscosity of 1000-5000 cps at 100° C. and the surface layer has a melt viscosity of 2000-10000 cps at 150° C.
Inventors
- 👤 Hirokatsu Imamura
- 👤 Koichi Nakamura
- 👤 Jiro Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:15
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/382; B41M5/38207; B41M5/38214; B41M5/423; B41M5/44; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/24876; Y10T428/24893; Y10T428/24901; Y10T428/24942; Y10T428/25; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/27; Y10T428/31504; Y10T428/31786; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
67 words
A thermal transfer sheet to be used for an n fold recording mode comprising a substrate film, a sensitizing layer formed on one surface side of the substrate film, an ink layer formed on the surface of the sensitizing layer, wherein the sensitizing layer and the ink layer are heat-fusible, and the sensitizing layer has a melt viscosity which is lower than that of the ink layer.
Claim 2
Dependent Claim
67 words
A thermal transfer sheet to be used for an n fold recording mode comprising a substrate film, a sensitizing layer formed on one surface side of the substrate film, an ink layer formed on the surface of the sensitizing layer, wherein the sensitizing layer and the ink layer are heat-fusible, and the sensitizing layer has a melt viscosity which is lower than that of the ink layer.
Claim 3
Dependent Claim
40 words
A thermal transfer sheet according to claim 1, wherein the ink layer has a melt viscosity of 1000 cps or higher at 100° C., and the sensitizing layer has a melt viscosity of 100 cps or lower at 100° C.
Claim 4
Dependent Claim
42 words
A thermal transfer sheet according to claim 1, wherein the ink layer contains carbon black and black dye, said carbon black having a surface area of at least 100 m 2 /g and an oil absorption of 130 cc/100 g or less.
Claim 5
Dependent Claim
16 words
A thermal transfer sheet according to claim 1, wherein the sensitizing layer is a colored layer.
Claim 6
Dependent Claim
20 words
A thermal transfer sheet according to claim 1, wherein the ink layer has a pigment concentration of 20-70 wt. %.
Claim 7
Dependent Claim
18 words
A thermal transfer sheet according to claim 1, wherein the ink layer has a thickness of 3-20 μm.
Claim 8
Dependent Claim
22 words
A thermal transfer sheet according to claim 1, wherein the ink layer comprises a wax and a thermoplastic resin as a vehicle.
Claim 9
Dependent Claim
37 words
A thermal transfer sheet according to claim 1, which has been wound around a core material and has an end detection mark on the back surface thereof disposed near to the binding part with the core material.
Claim 10
Dependent Claim
22 words
A thermal transfer sheet according to claim 1, wherein the sensitizing layer has been formed by the application of a wax emulsion.
Claim 11
Dependent Claim
40 words
A thermal transfer sheet according to claim 9, wherein the ink layer has a melt viscosity of 1000 cps or higher at 100° C., and the sensitizing layer has a melt viscosity of 100 cps or lower at 100° C.
Claim 12
Dependent Claim
20 words
A thermal transfer sheet according to claim 1, which further comprises a colorless surface layer formed on the ink layer.
Claim 13
Dependent Claim
40 words
A thermal transfer sheet according to claim 11, wherein the ink layer has a melt viscosity of 1000 cps or higher at 100° C., and the sensitizing layer has a melt viscosity of 100 cps or lower at 100° C.
Claim 14
Dependent Claim
22 words
A thermal transfer sheet according to claim 11, wherein the surface layer has a melt viscosity of 2000-10000 cps at 150° C.
Claim 15
Dependent Claim
18 words
A thermal transfer sheet according to claim 11, wherein the surface layer has a thickness of 0.1-5 μm.
Claim 16
Dependent Claim
30 words
A thermal transfer sheet according to claim 11, wherein the surface layer has been provided with minute unevenesses comprising oblique lines having an angle with respect to the moving direction.
Claim 17
Dependent Claim
25 words
A thermal transfer sheet according to claim 1, which further comprises a colorless surface layer and a colorless sealing layer formed on the ink layer.
Claim 18
Dependent Claim
40 words
A thermal transfer sheet according to claim 16, wherein the ink layer has a melt viscosity of 1000 cps or higher at 100° C., and the sensitizing layer has a melt viscosity of 100 cps or lower at 100° C.
Claim 19
Dependent Claim
36 words
A thermal transfer sheet according to claim 16, wherein the surface layer has a melt viscosity of 2000-10000 cps at 150° C., and the sealing layer has a melt viscosity of 20-100 cps at 100° C.
Claim 20
Dependent Claim
36 words
A thermal transfer sheet according to claim 1, which further comprises a back coating layer disposed on the other surface of the substrate film; said back coating layer comprising a binder predominantly comprising a styrene-acrylonitrile copolymer.
Claim 21
Dependent Claim
40 words
A thermal transfer sheet according to claim 19, wherein the ink layer has a melt viscosity of 1000 cps or higher at 100° C., and the sensitizing layer has a melt viscosity of 100 cps or lower at 100° C.
Claim 22
Dependent Claim
20 words
A thermal transfer sheet according to claim 19, wherein further comprises a colorless surface layer formed on the ink layer.
Claim 23
Dependent Claim
21 words
A thermal transfer sheet according to claim 19, wherein the styrene-acrylonitrile copolymer has an acrylonitrile copolymerization ratio of 20-40 mol. %.
Claim 24
Dependent Claim
23 words
A thermal transfer sheet according to claim 20, wherein the styrene-acrylonitrile copolymer has a molecular weight of 10×10 4 to 20×10 4 .
Claim 25
Dependent Claim
25 words
A thermal transfer sheet according to claim 19, wherein a linear polyester resin has been mixed in the back coating layer as an adhesive resin.
Claim 26
Dependent Claim
29 words
A thermal transfer sheet according to claim 19, which further comprises a primer layer comprising a linear polyester resin formed between the substrate film and the back coating layer.
Claim 27
Dependent Claim
30 words
A thermal transfer sheet according to claim 1, which is to be superposed on a transfer-receiving material having a Bekk smoothness of 20-800 sec., and subjected to thermal transfer operation.
References Cited (Backward Citations)
US4880324A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-07 | 1998-05-09 | 1998-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-07 | 2002-05-09 | 2002-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-07 | 2006-05-09 | 2006-11-08 | $7700.00 | Window Closed / Lapsed |