EP0099228A2
Expired / Lapsed
EP
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Electrosensitive transfer film
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-07-05
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Granted: —
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Expires: 2003-07-05
Abstract
Abstract An electric discharge transfer film material comprising at least two layers, the first of which is (a) an electrically anisotropic support layer (2) having electroconductive particles dispersed in a resin matrix. The electroconductive particles can be graphite particles having a particle size between 0.1 to 20 microns, carbon black particles having a particle size between 25 to 500 millimicrons, or metal powders, and (b) at least one thermal or electrothermal transfer layer (4) in the form of a resin layer capable of being broken by electrical discharge and transferred to a record sheet, e.g., paper.
Inventors
- 👤 Ray Henry Luebbe, Jr.
- 👤 Frank Miro
- 👤 David J. Robbins
- 👤 Frank Michael Palermiti
- 👤 Mark Allen Carter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:45
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/3825
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
86 words
An electric discharge transfer material characterized by comprising: (a) an electrically anisotropic support layer having electroconductive particles dispersed in a resin matrix wherein said electroconductive particles are: (1) graphite particles having a particle size between 0.1 to 20 microns, (2) carbon black particles having a particle size between 25 to 500 millimicrons, or (3) metal powders; and (b) at least one thermal or electrothermal transfer layer in the form of a resin layer capable of being broken by electrical discharge and transferred to a record sheet.
Claim 2
Dependent Claim
86 words
An electric discharge transfer material characterized by comprising: (a) an electrically anisotropic support layer having electroconductive particles dispersed in a resin matrix wherein said electroconductive particles are: (1) graphite particles having a particle size between 0.1 to 20 microns, (2) carbon black particles having a particle size between 25 to 500 millimicrons, or (3) metal powders; and (b) at least one thermal or electrothermal transfer layer in the form of a resin layer capable of being broken by electrical discharge and transferred to a record sheet.
Claim 3
Dependent Claim
116 words
An electric discharge transfer material according to claim 1 further characterized by comprising: (a) a semiconductive resin layer capable of being broken by electric discharging which has a surface resistance of 105 to 1016 ohms and a volume resistance of 10 3 to 10 14 ohms-cm; (b) an electroconductive electrically anisotropic resin layer containing said electroconductive particles, said electroconductive resin layer being laminated on one surface of the said semiconductive resin layer (a); and , (c) a conductive layer having a surface resistance of not more than 10 4 ohms and a volume resistance of not more than 10 2 ohms-cm, said conductive layer being laminated on the other surface of the said semiconductive resin layer.
Claim 4
Dependent Claim
31 words
An electric discharge transfer material according to claim 2 further characterized in that at least one of the semiconductive resin layer (a) and the conductive layer (c) contains a coloring substance.
Claim 5
Dependent Claim
19 words
An electric discharge transfer material according to claim 3 further characterized in that the coloring substance is carbon black.
Claim 6
Dependent Claim
41 words
An electric discharge transfer material according to any one of claims 1-4 further characterized in that the semiconductive resin layer capable of being broken by electric discharging comprises a thermoplastic or thernosetting resin and carbon black and a filler dispersed therein.
Claim 7
Dependent Claim
51 words
An electric discharge transfer material according to any one of claims 1-5 further characterized in that the said electrically anisotropic resin layer comprises between 60 to 70% by weight carbon black having a particle size between 25 and 500 millimicrons, based on the total weight of the resin and carbon black.
Claim 8
Dependent Claim
46 words
An electric discharge transfer material according to any one of claims 1-5 further characterized in that the said electrically anisotropic resin layer comprises between 5 and 65% by weight graphite having a particle size between 0.1 and 20 microns, based on the weight of the resin.
Claim 9
Dependent Claim
28 words
An electric dischage transfer material according to any one of claims 1-7 further said resin matrix comprises a phenoxy resin of the formula: wherein n is about 100.
Claim 10
Dependent Claim
159 words
A method for making an electrically anisotropic support layer useful in the electric discharge transfer materials of claim 7 or claim 7 characterized by comprising the steps of: (a) grinding a slurry of graphite particles in the presence of water or solvent having freezing and vapor pressure properties similar to water for a period of time sufficent to substantially completely disperse the graphite particles in said water or solvent; (b) adding a binding polymer to said graphite slurry, either as part of step (a) or immediately after step (a), wherein said polymer is soluble in said water or solvent; (c) freezing said slurry; (d) drying said slurry wherein said water or solvent present is caused to sublime resulting in the formation of polymeric coated graphite particles wherein at least a substantial portion of these particles have a diameter of at least 0.2 microns; and (e) casting said coated graphite particles into a support layer for an electroconductive transfer film.
Claim 11
Dependent Claim
24 words
A method according to claim 9 further characterized by solvent casting said coated graphite particles into a support layer for an electroconductive transfer film.
Claim 12
Dependent Claim
28 words
A method according to claim 9 or claim 10 further characterized in that the said water-soluble or solvent soluble binding polymer is polyvinyl alcohol, gelating or methyl cellulose.
Claim 13
Independent Claim
24 words
A method according to any one of claims 9-11 further characterized in that the said solvent is t-butyl alcohol, cyclohexane, benzene, dioxane, or p-xylene.
References Cited (Backward Citations)
No citation records indexed.
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