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Patent US4315643A successfully refreshed from Google Patents.
US4315643A
Expired / Lapsed
US
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Heat-sensitive transfer element
Assignee: Fujicopian Co Ltd
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Filing: 1980-05-23
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Granted: 1982-02-16
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Expires: 2000-05-23
Abstract
Abstract A heat-sensitive transfer element comprising a foundation, a thermal color-developing layer provided on the front surface of the foundation and a hot-melt ink layer provided on the back surface of the foundation; the ink layer including a heat conductive material powder and a solid wax, and having a melt-transfer property a printed image to be formed on the thermal color-developing layer by the impression of a thermal head, and simultaneously the hot-melt ink being transferred to a copy sheet facing the transfer element at the hot-melt ink layer side, the duplicated image having good clarity and excellent durability being able to be prepared at a high speed on a thermal printer.
Inventors
- 👤 Yukio Tokunaga
- 👤 Kiyoshi Sugiyama
- 👤 Tadao Seto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:36
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/48; B41M5/30; B41M5/382; B41M5/38207; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24992; Y10T428/26; Y10T428/266; Y10T428/27; Y10T428/273; Y10T428/277; Y10T428/31504; Y10T428/31801
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
135 words
A heat-sensitive transfer element comprising a foundation having a thickness of 20 to 60μ, density of 0.75 to 1.3 g/cm 3 and in which the back surface has a Bekk smoothness of 60 to 20000 seconds, a thermal color-developing layer provided on the front surface of said foundation, and a hot-melt ink layer having a coating weight of 1 to 15 g/m 2 and a heat conductivity of 4×10 -4 to 15×10 -4 cal./sec. cm. °C. provided on the back surface; the hot-melt ink layer including a heat-conductive material powder which has a heat conductivity of 6.0×10 -4 to 25.0×10 -4 cal./sec. cm. °C., and a solid wax which has a penetration of 10 to 30 at 25° C. as a binder material, and having a viscosity of 20 to 200 cP at 100° C.
Claim 2
Dependent Claim
135 words
A heat-sensitive transfer element comprising a foundation having a thickness of 20 to 60μ, density of 0.75 to 1.3 g/cm 3 and in which the back surface has a Bekk smoothness of 60 to 20000 seconds, a thermal color-developing layer provided on the front surface of said foundation, and a hot-melt ink layer having a coating weight of 1 to 15 g/m 2 and a heat conductivity of 4×10 -4 to 15×10 -4 cal./sec. cm. °C. provided on the back surface; the hot-melt ink layer including a heat-conductive material powder which has a heat conductivity of 6.0×10 -4 to 25.0×10 -4 cal./sec. cm. °C., and a solid wax which has a penetration of 10 to 30 at 25° C. as a binder material, and having a viscosity of 20 to 200 cP at 100° C.
Claim 3
Dependent Claim
22 words
The transfer element of claim 1, wherein said back surface of the foundation has a Bekk smoothness of 200 to 16000 seconds.
Claim 4
Dependent Claim
29 words
The transfer element of claim 1, wherein said foundation is a paper having a thickness of 30 to 50μ and a density of 0.8 to 1.2 g./cm. 3 .
Claim 5
Dependent Claim
24 words
The transfer element of claim 1, wherein said hot-melt ink layer has a heat conductivity of 5×10 -4 to 9×10 -4 cal./cm. sec. °C.
Claim 6
Dependent Claim
40 words
The transfer element of claim 1, wherein said thermal color-developing layer is a coating layer prepared by dispersing dye precursor and an acid which is solid or semi-solid in a binder material, and has a thickness less than about 10μ.
Claim 7
Dependent Claim
34 words
The transfer element of claim 1 or 5, wherein said hot-melt ink layer further includes a coloring material and a softener, and has a coating weight of about 3 to 10 g./m. 2 .
Claim 8
Dependent Claim
63 words
The transfer element of claim 6, wherein 2 to 30 parts by weight of said heat-conductive material, 5 to 25 parts by weight of the coloring material, 5 to 85 parts by weight of the binder material and 5 to 35 parts by weight of the softener are used per 100 parts by weight of the total amount of the hot-melt ink layer.
References Cited (Backward Citations)
US3983279A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-15 | 1985-08-17 | 1986-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-15 | 1989-08-17 | 1990-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-15 | 1993-08-17 | 1994-02-16 | $7700.00 | Window Closed / Lapsed |