EP0264902A2
Expired / Lapsed
EP
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Offset electrostatic imaging process
Assignee: Markem Imaje Corp
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Filing: 1987-10-20
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Granted: —
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Expires: 2007-10-20
Abstract
Abstract An offset electrostatic imaging process is disclosed which comprises the steps of (a) forming a latent electrostatic image on a dielectric imaging member (34), said dielecric imaging member being prepared by coating an electrically conductive substrate with a porous layer of a non-photoconductive metal oxide using a deposition process; (b) developing (38) the latent electrostatic image with a developer material which comprises a silicone polymer and from about 0.5 to about 5 percent by weight of a ,metal salt of a fatty acid; (c) transferring the developed image to an image receiving surface (22) by applying pressure (34, 36) between the dielectric imaging member (34) and the image receiving surface (22); (d) cleaning the dielectric imaging member using a first cleaning means (40) which is effective to remove developer material residue from above the surface of the porous oxide layer; and (e) further cleaning the dielectric imaging member using a second cleaning means (42) which is effective to remove developer material residue from the pores below the surface of the oxide layer.
Inventors
- 👤 Alan H. Boyer
- 👤 Graham D. Walter
- 👤 Robert A. Moore
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 06:24
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/087; G03G9/08742; G03G9/08773; G03G13/00; G03G13/06; G03G13/08; G03G13/22; G03G15/00; G03G15/22; G03G15/32; G03G15/321; G03G21/00; G03G21/0005; G03G5/00; G03G5/005; G03G5/02; G03G5/0202; G03G5/0217
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
160 words
An offset electrostatic image process comprising the steps of: (a) forming a latent electrostatic image on a dielectric imaging member, said dielectric imaging member being prepared by coating an electrically conductive substrate with a porous layer of a non-photoconductive metal oxide using a deposition process; (b) developing the latent electrostatic image with a developer material which comprises a silicone polymer and from about 0.5 to about 5 percent by weight of a metal salt of a fatty acid; (c) transferring the developed image to an image receiving surface by applying pressure between the dielectric imaging member and the image receiving surface; (d) cleaning the dielectric imaging member using a first cleaning means which is effective to remove developer material residue from above the surface of the porous oxide layer; and (e) further cleaning the dielectric imaging member using a second cleaning means which is effective to remove developer material residue from the pores below the surface of the oxide layer.
Claim 2
Dependent Claim
160 words
An offset electrostatic image process comprising the steps of: (a) forming a latent electrostatic image on a dielectric imaging member, said dielectric imaging member being prepared by coating an electrically conductive substrate with a porous layer of a non-photoconductive metal oxide using a deposition process; (b) developing the latent electrostatic image with a developer material which comprises a silicone polymer and from about 0.5 to about 5 percent by weight of a metal salt of a fatty acid; (c) transferring the developed image to an image receiving surface by applying pressure between the dielectric imaging member and the image receiving surface; (d) cleaning the dielectric imaging member using a first cleaning means which is effective to remove developer material residue from above the surface of the porous oxide layer; and (e) further cleaning the dielectric imaging member using a second cleaning means which is effective to remove developer material residue from the pores below the surface of the oxide layer.
Claim 3
Dependent Claim
33 words
The process of claim 1 wherein the metal oxide layer has a bulk electrical resistivity of at least 10 10 ohm-cm, and a surface finish of less than 0.46 microns (18 microinches) rms.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the metal oxide is aluminum oxide.
Claim 5
Dependent Claim
16 words
The process of claim 2 wherein the bulk electrical resistivity is at least 10 11 ohm-cm.
Claim 6
Dependent Claim
17 words
The process of claim 2 wherein the surface finish is less than 0.381 microns (15. microinches) rms.
Claim 7
Dependent Claim
30 words
The process of claim 1 wherein the surface capacitance of the metal oxide layer is from about 93 to 155 pF/cm 2 (about 600 to about 1000 picofaradslin 2 ).
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein the diamond pyramid hardness (kg/mm 2 @ 300 g load) of the metal oxide layer is at least 500.
Claim 9
Dependent Claim
25 words
The process of claim 7 wherein the diamond pyramid hardness (kg/mm 2 @ 300 g load) of the metal oxide layer is at least 1000.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein the deposition process is a plasma spraying process.
Claim 11
Dependent Claim
14 words
The process of claim 1 wherein the deposition process is a detonation gun process.
Claim 12
Dependent Claim
21 words
The process of claim 1 wherein the latent electrostatic image is formed by means of an ion modulated electrostatic print head.
Claim 13
Dependent Claim
38 words
The process of claim 1 wherein the ion modulated electrostatic print head comprises a modulated aperture board having a plurality of selectively controlled apertures therein, and an ion generator for providing ions for electrostatic projection through the apertures.
Claim 14
Dependent Claim
14 words
The process of claim 1 wherein the first cleaning means is a doctor blade.
Claim 15
Dependent Claim
14 words
The process of claim 1 wherein the second cleaning means is a fibrous material.
Claim 16
Dependent Claim
25 words
A developer material comprising a silicone polymer and from about 0.5 to about 5 percent by weight of a metal salt of a fatty acid.
Claim 17
Dependent Claim
25 words
A developer material comprising a silicone polymer and from about 0.5 to about 5 percent by weight of a metal salt of a fatty acid.
Claim 18
Dependent Claim
17 words
The developer material of claim 15 wherein the metal salt of the fatty acid is zinc stearate.
References Cited (Backward Citations)
No citation records indexed.
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