EP0104074A2
Expired / Lapsed
EP
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Construction for transparency film for plain paper copiers
Assignee: 3M Co
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Filing: 1983-09-19
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Granted: —
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Expires: 2003-09-19
Abstract
Abstract This invention relates to a construction of a transparent sheet material for making transparencies in plain paper electrostatic copiers. Polymeric films have a tendency of acquiring a nonuniform electrostatic charge under certain conditions of contact triboelectric or induction charging. This tendency is undesirable when imaging transparency films in electrostatic copying machines. If charges on such films are not dissipated, toner images become distorted by electrostatic discharges within the copier. In the case of plain paper copiers employing liquid toner, charges on the transparency film cause the liquid to form voids, or bubbles, in the formed images, thus distorting these images. The transparency film of this invention comprises (a) a flexible, transparent, heat resistant, polymeric film base, (b) an image receiving layer carried upon a first major surface of the film base, and (c) a layer of electrically conductive material carried on a second major surface of the film base. The surface resistivity of the image receiving layer must equal or exceed 1 x 10 14 ohms per square. The surface resistivity of the layer comprising the conductive material must be from about 1 x 10" to about 5 x 10' 3 ohms per square. This transparency film minimizes the formation of voids in the imaged film.
Inventors
- 👤 Donald W. C/O Minnesota Mining And Edwards
- 👤 Donald C/O Minnesota Mining And Williams
- 👤 Terrance J. C/O Minnesota Mining And Russell
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 13:02
CPC Classifications
G; G03; G03G; G03G7/00; G03G7/0006; G03G7/0053; G03G7/0086; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/31504; Y10T428/31507; Y10T428/31511; Y10T428/31652; Y10T428/31667; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31935; Y10T428/31938
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
An optically transparent film which can be electrostatically imaged and which comprises (a) a flexible, transparent, heat resistant polymeric film base, (b) an image receiving layer carried on a first major surface of said film base, (c) an electrically conductive layer comprising a conductive material carried on a second major surface of said film base, characterised in that the conductive material of the conductive layer does not migrate to objects which come in contact with said conductive layer, and said conductive layer further has a surface resistivity of from about 1 x 10 11 ohms per square to about 5 x 1013 ohms per square.
Claim 2
Dependent Claim
105 words
An optically transparent film which can be electrostatically imaged and which comprises (a) a flexible, transparent, heat resistant polymeric film base, (b) an image receiving layer carried on a first major surface of said film base, (c) an electrically conductive layer comprising a conductive material carried on a second major surface of said film base, characterised in that the conductive material of the conductive layer does not migrate to objects which come in contact with said conductive layer, and said conductive layer further has a surface resistivity of from about 1 x 10 11 ohms per square to about 5 x 1013 ohms per square.
Claim 3
Dependent Claim
27 words
The film of claim 1 wherein the surface resistivity of the image receiving layer is equal to or greater than 1 x 10 14 ohms per square.
Claim 4
Dependent Claim
21 words
The film of claim 1 wherein the electrically conductive layer further comprises a protective coating layer coaled over said conductive material.
Claim 5
Dependent Claim
23 words
The film of claim 1 or 3 wherein the film base material is selected from the group consisting of polyesters, polycarbonates, and polysulfones.
Claim 6
Dependent Claim
18 words
The film of claim 1 or 3 wherein the image receiving layer material is a transparent polymeric material.
Claim 7
Dependent Claim
24 words
The film of claim 1 or 3 wherein the conductive material in the electrically conductive layer is a reaction product of partially chloromethylated polystyrene.
Claim 8
Dependent Claim
230 words
The film of claim 6 wherein the reaction product of partially chloromethylated polystyrene is selected from the group consisting of wherein x + y + z = 1.0, and x represents the mole fraction of the pyridine adduct in the copolymer, y represents the mole fraction of the 2-amino pyridine adduct in the copolymer, z represents the mole fraction of the unsubstituted phenyl portion of the copolymer, wherein x + z = 1.0, and x represents the mole fraction of the pyridine adduct in the copolymer, z represents the mole fraction of the unsubstituted phenyl portion of the copolymer, wherein y + z = 1.0, and y represents the mole fraction of the 2-amino pyridine adduct in the copolymer, z represents the mole fraction of the unsubstituted phenyl portion of the copolymer, wherein y + z = 1.0, and y represents the mole fraction of the dimethyl hydrazine adduct in the copolymer, z represents the mole fraction of the unsubstituted phenyl portion of the copolymer, wherein y + z = 1.0, and y represents the mole fraction of the triphenyl phosphine adduct in the copolymer, z represents the mole fraction of the unsubstituted phenyl portion of the copolymer, wherein x + z = 1.0, and x represents the mole fraction of the tributylamine adduct in the copolymer, z represents the mole fraction of the unsubstituted phenyl portion of the copolymer.
Claim 9
Dependent Claim
13 words
The film of claim 3 wherein the electrically conductive material is water soluble.
Claim 10
Dependent Claim
14 words
The film of claim 8 wherein the conductive material is a quaternary ammonium polymer.
Claim 11
Dependent Claim
27 words
The film of claim 1 or 3 wherein one side of the film base includes a primer coating between the film base and the image receiving layer.
Claim 12
Dependent Claim
28 words
The film of claim 10 wherein the other side of the film base further includes a primer coating between the film base and the layer of conductive material.
Claim 13
Dependent Claim
27 words
The film of claim 1 or 3 wherein one side of the film base includes a primer coating between the film and the layer of conductive material.
Claim 14
Dependent Claim
27 words
The film of any one of claims 10 to 12 wherein the primer is selected from the group consisting of polyester resins, polyvinyl acetate, and polyvinylidene chloride.
Claim 15
Dependent Claim
16 words
The film of claim 1 or 3 wherein the electrically conductive material is an inorganic material.
Claim 16
Dependent Claim
24 words
The film of claim 14 wherein the conductive material is selected from the group consisting of electrically conductive metals and electrically conductive metal oxides.
Claim 17
Dependent Claim
30 words
The film of claim 1 or 3 wherein the electrically conductive material is a resin formed by combining an epoxy silane and a silane sulfonate derived from an epoxy silane.
Claim 18
Dependent Claim
21 words
Method of producing a transparency by an electrostatic printing process, said transparency being produced from the sheet material of claim 1.
References Cited (Backward Citations)
No citation records indexed.
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