US5286521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reusable ink sheet for use in heat transfer recording and production process thereof
Assignee: Fujitsu Ltd
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Filing: 1992-06-29
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Granted: 1994-02-15
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Expires: 2012-06-29
Abstract
Abstract A reusable, heat transfer recording ink sheet using an ink containing, in addition to a colorant and a vehicle, ethylene/vinyl acetate-coated fine powders capable of being partially transferred to an inkreceiving recording medium for each transfer recording, the ethylene/vinyl acetate having a number average molecular weight of 30,000 or less and a vinyl acetate unit thereof being in the range of 18 to 45% by weight of the copolymer. The ink sheet ensures that prints having a sufficiently high density of print and an excellent fixing of the ink to the recording medium are obtained, together with a remarkably increased number of the repetitions of use of the sheet. A production process of the ink sheet is also provided.
Inventors
- 👤 Genichi Matsuda
- 👤 Takesi Sugii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:05
CPC Classifications
B; B41; B41J; B41J31/00; 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; Y10T428/25; Y10T428/254; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/31935
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A process for the production of a reusable, heat transfer recording ink sheet which comprises providing an ink which contains: at least one dye and/or pigment as a colorant; a low melting compound as a vehicle; and fine powders coated with ethylene/vinyl acetate copolymer and having a particle size of 0.01 to 200 μm, by dispersing the powders in a mixture of the dye and/or pigment and the low-melting compound, and coating said ink on a substrate, the ethylene/vinyl acetate copolymer having a number average molecular weight of 30,000 or less and containing vinyl acetate units in an amount of 18 to 45% by weight of the copolymer.
Claim 2
Dependent Claim
108 words
A process for the production of a reusable, heat transfer recording ink sheet which comprises providing an ink which contains: at least one dye and/or pigment as a colorant; a low melting compound as a vehicle; and fine powders coated with ethylene/vinyl acetate copolymer and having a particle size of 0.01 to 200 μm, by dispersing the powders in a mixture of the dye and/or pigment and the low-melting compound, and coating said ink on a substrate, the ethylene/vinyl acetate copolymer having a number average molecular weight of 30,000 or less and containing vinyl acetate units in an amount of 18 to 45% by weight of the copolymer.
Claim 3
Dependent Claim
38 words
A production process according to claim 1, in which the ink is coated onto the surface of the substrate in the absence of an interlayer to form an ink layer having a thickness of 2 to 20 μm.
Claim 4
Dependent Claim
73 words
A production process according to claim 1, in which the ethylene/vinyl acetate copolymer is a combination of a first ethylene/vinyl acetate copolymer having a number average molecular weight of 30,000 or less and containing vinyl acetate units of 18-26 by weight of the copolymer and a second ethylene/vinyl copolymer having a number average molecular weight of 30,000 or less and containing vinyl acetate units of 27 to 45% by weight of the copolymer.
Claim 5
Dependent Claim
31 words
A production process according to claim 1, in which the dye and/or pigment is used in the range of 4 to 50% by weight of the total amount of the ink.
Claim 6
Dependent Claim
31 words
A production process according to claim 1, in which the low melting compound is used in the range of 5 to 80% by weight of the total amount of the ink.
Claim 7
Dependent Claim
32 words
A production process according to claim 1, in which the ethylene/vinyl acetate-coated fine powders are used in the range of 3 to 50% by weight of the total amount of the ink.
Claim 8
Dependent Claim
38 words
A production process according to claim 1, in which the ethylene/vinyl acetate-coated fine powders are prepared by blending the uncoated fine powders and the ethylene/vinyl acetate in accordance with a hot melt dispersion method and pulverizing the dispersion.
Claim 9
Dependent Claim
40 words
A production process according to claim 1, in which the ethylene/vinyl acetate-coated fine powders are prepared by dispersing the uncoated fine powders and the ethylene/vinyl acetate in a solvent in accordance with a solvent dispersion method and pulverizing the dispersion.
Claim 10
Dependent Claim
65 words
A production process according to claim 1, in which after the preparation of each of the ethylene/vinyl acetate-coated fin powders and the mixture of the dye and/or pigment and the low-melting compound, they are blended in accordance with a hot melt dispersion method and the dispersion is coated on the substrate surface in accordance with a hot melt coating method to form an ink sheet.
Claim 11
Dependent Claim
63 words
A production process according to claim 1, in which after the preparation of each of the ethylene/vinyl acetate-coated fine powders and the mixture of the dye and/or pigment and the low-melting compound, they are blended in accordance with a solvent dispersion method and the dispersion is coated on the substrate surface in accordance with a solvent coating method to form an ink sheet.
Claim 12
Dependent Claim
69 words
A production process according to claim 1, in which after the preparation of each of the ethylene/vinyl acetate-coated fine powders and the mixture of the dye and/or pigment and the low-melting compound, they are blended in accordance with a hot melt dispersion method, the dispersion is pulverized and the resulting powders are coated on the substrate surface in accordance with a solvent coating method to form an ink sheet.
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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) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |