EP0116313A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Printable media for use in non-impact printing and methods of producing such media
Assignee: International Business Machines Corp
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Filing: 1984-01-17
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Granted: —
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Expires: 2004-01-17
Abstract
Abstract The drawing illustrates a printable medium 1 comprising paper support 11, conductive film 12 and printing layer 13 associated with writing current probes 31 and 35 and common return electrode 5. A printed letter P is shown. The layer 13 comprises a thermally sensitive image forming compound and a finely divided conductive material embedded in a suitable carrier. The carrier may comprise a polymer binder e.e. polycarbonate, polyester, polyurethane, Kapton * and the conductive material may comprise suspended particles of, for example, zinc iodide, zinc oxide, tin oxide, titanium dioxide or a mixture. The image forming compound may comprise for example silver behenate, leucoform triphenylmethane dye. Appropriate dye precursors and/or a roughening agent may also be present.
Inventors
- 👤 Keith Samuel Pennington
- 👤 Krishna Gandhi Sachdev
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:54
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
34 words
Printable medium for use in non-impact printing, said medium comprising a substrate supporting a composite electrothermic layer comprising a thermally sensitive image forming compound and a finely divided conductive material embedded in a carrier.
Claim 2
Dependent Claim
34 words
Printable medium for use in non-impact printing, said medium comprising a substrate supporting a composite electrothermic layer comprising a thermally sensitive image forming compound and a finely divided conductive material embedded in a carrier.
Claim 3
Dependent Claim
23 words
2 . A printable medium as claimed in claim 1, further comprising a thin conductive layer between the substrate and the composite layer.
Claim 4
Dependent Claim
36 words
A printable medium as claimed in claim 1 or 2, in which said composite electrothermic layer comprises (by weight) approximately: 15 parts polymer carrier; 10 parts thermally sensitive dye; and 10 parts finely divided conductive materials.
Claim 5
Dependent Claim
61 words
A printable medium as claimed in claim 1, 2 or 3, in which said finely divided conductive material is one of or a mixture of zinc iodide, copper iodide, antimony trioxide, molybdenum oxide, cadmium sulfide, molybdenum disulfide, zinc oxide, tin oxide, titanium dioxide, oligostyrene sulfonate, polyethylene imine salts, doped polyacetylenes and polyphenylenes, metallic conductive particles such as zinc, tin or silver.
Claim 6
Dependent Claim
24 words
A printable medium as claimed in any one of claims 1 to 4, in which said composite electrothermic layer further comprises a roughening agent.
Claim 7
Dependent Claim
28 words
A printable medium as claimed in claim 5, in which said roughening agent is one or a mixture of silica, alumina, aluminium hydroxide, calcium carbonate, and titanium dioxide.
Claim 8
Dependent Claim
41 words
A printable medium as claimed in any one of claims 1 to 6, in which said image forming compound is a leucoform dye of a leuco base of the triphenylmethane series that undergoes dye formation when subjected to electrical resistance heat.
Claim 9
Dependent Claim
42 words
A printable medium as claimed in any one of claims 1 to 6, in which said image forming compound is a fluorene analog of crystal violet that undergoes an oxidation elimination reaction to a colored form when subjected to electrical resistance heat.
Claim 10
Dependent Claim
37 words
A printable medium as claimed in any one of claims 1 to 6, in which said image forming compound is a saccharine derived leuco carbinol system which undergoes irreversible colour change when subjected to electrical resistance heat.
Claim 11
Dependent Claim
50 words
A printable medium as claimed in any one of claims 1 to 6, in which said image forming compound is a said thermally sensitive dye and is a diazohemicyanine dye in the benzothiazole series which can be permanently bound to a polymer with free reactive sites when subjected to heat.
Claim 12
Dependent Claim
20 words
A printable medium as claimed in claim 10, in which said diazohemicyanine dye includes a 2- carbamoyl ethyl side chain.
Claim 13
Dependent Claim
32 words
A printable medium as claimed in claim 1 or 2, in which said composite electrothermic layer comprises a carrier, a thermally sensitive dye, a finely divided conductive material and a dye precursor.
Claim 14
Dependent Claim
19 words
A printable medium as claimed in claim 12, in which said dye precursor is a sulfamino derivative of 4-amino-diphenylamine.
Claim 15
Dependent Claim
49 words
A printable medium as claimed in claim 12, in which said thermally sensitive dye is a mixture of a first component selected from the group (0 - cyanobenzamide and phtalonitrile) and a second component is a salt of a metal selected from the group (copper, cobalt, zinc, aluminium, tin).
Claim 16
Dependent Claim
55 words
A method of producing a printable medium as claimed in claim 1, 2 or 3, said medium being produced by separately mixing a first mixture and a second mixture, combining the mixtures briefly, and coating the combined mixture on a substrate, said first mixture comprising approximately (by weight) said second mixture comprising approximately (by weight)
Claim 17
Dependent Claim
51 words
A method of producing a printable medium as claimed in claim 7, said medium being produced by mixing a first mixture and a second mixture, combining the mixtures briefly, and coating the combined mixture on a substrate, said first mixture comprising approximately (by weight) said second mixture comprising approximately (by weight)
Claim 18
Dependent Claim
52 words
A method of producing a printable medium as claimed in claim 7, said medium being produced by mixing a first mixture and a second mixture, combining the mixtures briefly, and coating the combined mixture on a substrate, in which said first mixture comprises approximately (by weight) fluorene analog of crystal violet 10.
Claim 19
Dependent Claim
55 words
A method of producing a printable medium as claimed in claim 1, 2 or 3, said medium being prepared by separately mixing a first mixture and a second mixture, combining the mixtures briefly, and coating the combined mixture on a substrate, said first mixture comprises approximately (by weight) said second mixture comprising approximately (by weight)
Claim 20
Dependent Claim
55 words
A method of producing a printable medium as claimed in claim 1, 2 or 3, said medium being prepared by separately mixing a first mixture and a second mixture, combining the mixtures briefly, and coating the combined mixture on a substrate, said first mixture comprises approximately (by weight) said second mixture comprises approximately (by weight)
References Cited (Backward Citations)
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