Patent EP0264902A2 successfully refreshed from Google Patents.
EP0264902A2
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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 08:46
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)
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