EP0467141A1
Expired / Lapsed
EP
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Thermal transfer printing method and intermediate sheets therefor
Assignee: Panasonic Holdings Corp
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Filing: 1991-07-02
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Granted: —
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Expires: 2011-07-02
Abstract
Abstract The present invention is directed to a thermal transfer printing process comprising; heating a thermal ink film (1) with a printing head (4) to print dye transferring images onto an intermediate sheet (2) which comprises a substrate (10) and a printing layer (11) thereon, heaping an image receive sheet (3) on said printing layer (11), and transferring said printing layer (11) onto an image receive sheet (3) by pressure or heat; an improvement residing in that said printing layer (11) is formed from polyvinyl acetal. The present invention also provides an intermediate sheet for the above thermal transfer printing process comprising a substrate and a printing layer on said substrate wherein said printing layer is formed from polyvinyl acetal.
Inventors
- 👤 Akihiro Imai
- 👤 Yasuo Fukui
- 👤 Nobuyoshi Taguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 01:03
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38257; B41M5/50; B41M5/52; B41M5/5254
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
69 words
A thermal transfer printing process comprising; heating a thermal ink film with a printing head to print dye transferring images onto an intermediate sheet which comprises a substrate and a printing layer thereon, heaping an image receive sheet on said printing layer, and transferring said printing layer onto an image receive sheet by pressure or heat; an improvement residing in that said printing layer is formed from polyvinyl acetal.
Claim 2
Dependent Claim
69 words
A thermal transfer printing process comprising; heating a thermal ink film with a printing head to print dye transferring images onto an intermediate sheet which comprises a substrate and a printing layer thereon, heaping an image receive sheet on said printing layer, and transferring said printing layer onto an image receive sheet by pressure or heat; an improvement residing in that said printing layer is formed from polyvinyl acetal.
Claim 3
Dependent Claim
34 words
The thermal transfer printing process according to Claim 1 wherein said intermediate sheet comprises the substrate, a polymer material layer formed on said substrate and said printing layer formed on the polymer material layer.
Claim 4
Dependent Claim
32 words
The thermal transfer printing process according to Claim 1 wherein said intermediate sheet comprises the substrate, a releasing layer formed on said substrate and said printing layer formed on the releasing layer.
Claim 5
Dependent Claim
42 words
The thermal transfer printing process according to Claim 1 wherein said intermediate sheet comprises the substrate, a releasing layer formed on the substrate, a polymer material layer formed on said releasing layer and said printing layer formed on the polymer material layer.
Claim 6
Dependent Claim
47 words
The thermal transfer printing process according to Claim 2 or 4 wherein said polymer material layer is formed from a polymer material selected from the group consisting of polyvinyl alcohol or a derivative thereof, cellulose derivative, modified starch, starch derivative, chlorinated resin, polycarbonate and a mixture thereof.
Claim 7
Dependent Claim
36 words
The thermal transfer printing process according to Claim 1 wherein said thermal ink film comprises a substrate A and a color layer comprising a dye, a polymer binder and a fluorine or siloxane-containing moisture curable resin.
Claim 8
Dependent Claim
30 words
The thermal transfer printing process according to Claim 1 wherein said printing layer also contains at least one fluorine or siloxane-containing moisture curable resin, in addition to the polyvinyl acetal.
Claim 9
Dependent Claim
28 words
The thermal transfer printing process according to anyone of Claims 2, 4 and 5 wherein said polymer material layer further comprises a fluorine or siloxane-containing moisture curable resin.
Claim 10
Dependent Claim
25 words
The thermal transfer printing process according to Claim 3 or 4 wherein said releasing layer is formed from a fluorine or siloxane-containing moisture curable resin.
Claim 11
Dependent Claim
17 words
The thermal transfer printing process according to Claim 1 wherein said printing head is a thermal head.
Claim 12
Dependent Claim
17 words
The thermal transfer printing process according to Claim 5 wherein said polyvinyl alcohol derivative is polyvinyl acetal.
Claim 13
Dependent Claim
24 words
The thermal transfer printing process according to Claim 1 or 11 wherein said polyvinyl acetal has an average polymerization degree of 2,700 or less.
Claim 14
Dependent Claim
25 words
The thermal transfer printing process according to Claim 1 or 11 wherein said polyvinyl acetal has an acetalization degree of 50 mol % or more.
Claim 15
Dependent Claim
25 words
The thermal transfer printing process according to Claim 1 or 11 wherein said polyvinyl acetal has a flow softening point of 80 to 250 C.
Claim 16
Dependent Claim
24 words
The thermal transfer printing process according to anyone of Claims 6 to 9 wherein said fluorine-containing moisture curable resin is a fluorine-containing acrylsilicon resin.
Claim 17
Dependent Claim
24 words
The thermal transfer printing process according to anyone of Claims 6 to 9 wherein said siloxane-containing moisture curable resin is a siloxane-containing acrylsilicon resin.
Claim 18
Dependent Claim
29 words
The thermal transfer printing process according to anyone of Claims 2, 4, 5 and 8 wherein said polymer material, has a glass transition temperature of at least 50 C.
Claim 19
Dependent Claim
31 words
The thermal transfer printing process according to anyone of Claims 2, 4, 5 and 8 Claim 1 wherein said polymer material has a flow softening point of 80 to 250 C.
Claim 20
Dependent Claim
74 words
The thermal transfer printing process according to Claim 1 wherein said thermal ink film comprises a substrate A and a color layer comprising a dye and a polymer binder which is selected from the group consisting of acrylonitrile-styrene copolymer, polystyrene, styrene-acryl copolymer, polyvinyl chloride, chlorinated polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, vinyl chloride-acrylic ester copolymer, saturated polyester, polyester urethane, polyvinyl acetal, cellulose resin, rubber chloride, chlorinated polypropylene, polycarbonate and a mixture thereof.
Claim 21
Dependent Claim
28 words
An intermediate sheet for the thermal transfer printing process according to Claim 1, comprising a substrate B and a polyvinyl acetal printing layer formed on said substrate B.
Claim 22
Dependent Claim
24 words
The intermediate sheet according to Claim 20 wherein a polymer material layer is disposed between said substrate B and said polyvinyl acetal printing layer.
Claim 23
Dependent Claim
23 words
The intermediate sheet according to Claim 20 wherein a releasing layer is disposed between said substrate B and said polyvinyl acetal printing layer.
Claim 24
Dependent Claim
35 words
The intermediate sheet according to Claim 20 wherein a releasing layer and a polymer material layer is disposed between said substrate B and said polyvinyl acetal printing layer in this order from said substrate B.
Claim 25
Dependent Claim
45 words
The intermediate sheet according to Claim 21 or 23 wherein said polymer material layer is formed from a polymer material selected from the group consisting of polyvinyl alcohol or a derivative thereof, cellulose derivative, modified starch, starch derivative, chlorinated resin, polycarbonate and a mixture thereof.
Claim 26
Dependent Claim
28 words
The intermediate sheet according to Claim 20 wherein said printing layer also contains at least one fluorine or siloxane-containing moisture curable resin, in addition to the polyvinyl acetal.
Claim 27
Dependent Claim
26 words
The intermediate sheet according to anyone of Claims 21, 23 and 24 wherein said polymer material layer further comprises a fluorine or siloxane-containing moisture curable resin.
Claim 28
Dependent Claim
23 words
The intermediate sheet according to Claim 22 or 23 wherein said releasing layer is formed from a fluorine or siloxane-containing moisture curable resin.
Claim 29
Dependent Claim
17 words
The thermal transfer printing process according to Claim 24 wherein said polyvinyl alcohol derivative is polyvinyl acetal.
Claim 30
Dependent Claim
22 words
The intermediate sheet according to Claim 20 or 28 wherein said polyvinyl acetal has an average polymerization degree of 2,700 or less.
Claim 31
Dependent Claim
23 words
The intermediate sheet according to Claim 20 or 28 wherein said polyvinyl acetal has an acetalization degree of 50 mol % or more.
Claim 32
Dependent Claim
23 words
The intermediate sheet according to Claim 20 or 28 wherein said polyvinyl acetal has a flow softening point of 80 to 250 C.
Claim 33
Dependent Claim
22 words
The intermediate sheet according to anyone of Claims 25 to 27 wherein said fluorine-containing moisture curable resin is a fluorine-containing acrylsilicon resin.
Claim 34
Dependent Claim
22 words
The intermediate sheet according to anyone of Claims 25 to 27 wherein said siloxane-containing moisture curable resin is a siloxane-containing acrylsilicon resin.
Claim 35
Dependent Claim
23 words
The intermediate sheet according to Claim 21 or 23 wherein said polymer material has a glass transition temperature of at least 50 °C.
Claim 36
Dependent Claim
23 words
The intermediate sheet according to Claim 21 or 23 wherein said polymer material has a flow softening point of 80 to 250 °C.
References Cited (Backward Citations)
US4923848A
Cited
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