US4690858A
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Thermal transfer sheet
Assignee: Hitachi Ltd
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Filing: 1986-02-13
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Granted: 1987-09-01
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Expires: 2006-02-13
Abstract
Abstract A thermal transfer recording sheet comprising a substrate and ink layer formed thereon containing one or more sublimable dyes and a high-molecular-weight polyamide obtained from dimer acids as a binder is good in adherence of the ink layer to the substrate, and thermal transfer properties to give clear color hard copies.
Inventors
- 👤 Hiroyuki Oka
- 👤 Shinichi Akasaka
- 👤 Shuichi Ohara
- 👤 Shintaroo Hattori
- 👤 Yasuki Mori
- 👤 Toshikazu Narahara
- 👤 Hiroshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:52
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/392; B41M5/395; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/266; Y10T428/31504; Y10T428/31725; Y10T428/31728; Y10T428/31732; Y10T428/31736; Y10T428/31739; Y10T428/3175; Y10T428/31779
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
43 words
A thermal transfer recording sheet comprising a substrate and an ink layer formed thereon containing one or more sublimable dyes and a binder, said binder being a high-molecular-weight polyamide obtained from dimer acids and having a softening point of 100° C. or higher.
Claim 2
Dependent Claim
43 words
A thermal transfer recording sheet comprising a substrate and an ink layer formed thereon containing one or more sublimable dyes and a binder, said binder being a high-molecular-weight polyamide obtained from dimer acids and having a softening point of 100° C. or higher.
Claim 3
Dependent Claim
22 words
A thermal transfer recording sheet according to claim 1, wherein the polyamide has a softening point of 100° C. to 220° C.
Claim 4
Dependent Claim
20 words
A thermal transfer recording sheet according to claim 1, wherein the polyamide has a molecular weight of 4000 or more.
Claim 5
Dependent Claim
20 words
A thermal transfer recording sheet according to claim 1, wherein the polyamide has a molecular weight of 6000 to 20,000.
Claim 6
Dependent Claim
20 words
A thermal transfer recording sheet according to claim 1, wherein the polyamide has a molecular weight of 30,000 to 40,000.
Claim 7
Dependent Claim
20 words
A thermal transfer recording sheet according to claim 1, wherein the substrate is cellulose series paper or a polymer film.
Claim 8
Dependent Claim
56 words
A thermal transfer recording sheet according to claim 1, wherein the ink layer is obtained by coating on the substrate an ink composition comprising 1 to 20% by weight of a sublimable dye, 2 to 40% by weight of a high-molecular-weight polyamide obtained from dimer acids, and 40 to 97% by weight of an organic solvent.
Claim 9
Dependent Claim
28 words
A thermal transfer recording sheet according to claim 7, wherein said sublimable dye is capable of vaporizing at a temperature about 100° to 200° C. under atmospheric pressure.
Claim 10
Dependent Claim
22 words
A thermal transfer recording sheet according to claim 8, wherein said sublimable dye has a molecular weight of about 200 to 400.
Claim 11
Dependent Claim
28 words
A thermal transfer recording sheet according to claim 7, wherein said organic solvent comprises a material selected from the group consisting of alcohols, esters, ketones and halogenated hydrocarbons.
Claim 12
Dependent Claim
26 words
A thermal transfer recording sheet according to claim 7, wherein said organic solvent comprises a mixed solvent of an aliphatic or aromatic hydrocarbon and an alcohol.
Claim 13
Dependent Claim
21 words
A thermal transfer recording sheet according to claim 11, wherein said organic solvent comprises a mixture of toluene and isopropyl alcohol.
Claim 14
Dependent Claim
30 words
A thermal transfer recording sheet according to claim 7, wherein said ink composition consists essentially of said sublimable dye, said high-molecular-weight polyamide obtained from dimer acids and said organic solvent.
Claim 15
Dependent Claim
16 words
A thermal transfer recording sheet according to claim 1, wherein the substrate is a polymer film.
Claim 16
Dependent Claim
20 words
A thermal transfer recording sheet according to claim 14, wherein said substrate has a thickness of 6 μm or less.
Claim 17
Dependent Claim
21 words
A thermal transfer recording sheet according to claim 15, wherein said ink layer has a thickness of 5 μm or less.
References Cited (Backward Citations)
US4253838A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |