EP0104625A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Printing plate for raised printing and method of making the same
Assignee: Coulter Systems Corp
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Filing: 1983-09-23
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Granted: —
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Expires: 2003-09-23
Abstract
Abstract A printing plate formed by transferring a toned electrostatically formed image to a thin coating (10') of one reactive component of a two-part thermosetting epoxy resin system bonded to a sheet metal substrate (12). The toner includes the second reactive component of said epoxy system. The coating can include a heat softenable material and also can include the hardener reactive component while the toner can be formed of the second or epoxy component either with or without a small amount of hardener. Heat (32) after transfer can be employed to complete polymerization of the two components.
Inventors
- 👤 Manfred R. Kuehnle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 10:17
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/26; G03G13/32; G03G13/28; G03G13/283
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
An electrophotographic method of making a printing plate comprising the steps of providing a metal sheet substrate, coating the metal sheet substrate with a thin layer bonded thereto and including the reactive component of a two-component thermosetting epoxy resin system forming a receptor, providing an electrophotographic medium having a photoconductive surface capable of accepting a rapid charge and retaining the same sufficient to enable toning, charging the surface of the photoconductive surface in darkness and exposing same to a light pattern forming a latent charge image of the pattern on the photoconductive surface, toning said latent charge image with a toner which includes as a part thereof the second reactive component of said two component thermosetting epoxy system to form a toner image, transferring said toner image to said receptor, interacting said two reactive components where present only at the imaged areas to form an infusible thermoset epoxy polymer to define printing parts and the unreacted areas forming the nonprinting parts and thereafter removing the unreacted areas.
Claim 2
Dependent Claim
167 words
An electrophotographic method of making a printing plate comprising the steps of providing a metal sheet substrate, coating the metal sheet substrate with a thin layer bonded thereto and including the reactive component of a two-component thermosetting epoxy resin system forming a receptor, providing an electrophotographic medium having a photoconductive surface capable of accepting a rapid charge and retaining the same sufficient to enable toning, charging the surface of the photoconductive surface in darkness and exposing same to a light pattern forming a latent charge image of the pattern on the photoconductive surface, toning said latent charge image with a toner which includes as a part thereof the second reactive component of said two component thermosetting epoxy system to form a toner image, transferring said toner image to said receptor, interacting said two reactive components where present only at the imaged areas to form an infusible thermoset epoxy polymer to define printing parts and the unreacted areas forming the nonprinting parts and thereafter removing the unreacted areas.
Claim 3
Dependent Claim
25 words
The method according to claim 1 in which the said receptor is preheated to soften the coating prior to transfer of the toner image thereto.
Claim 4
Independent Claim
27 words
The method according to claims 1 or 2 in which said receptor is heated subsequent to receipt of the toner image thereon whereby to effect the polymerization.
Claim 5
Independent Claim
27 words
The method according to any one of claims 1, 2 or 3 wherein the toning is effected electrophoretically and the resulting toner image is dried before transfer.
Claim 6
Independent Claim
28 words
The method according to any one of claims 1 to 4 in which the toner particles include the resin component and the receptor coating carries -the hardener component.
Claim 7
Independent Claim
44 words
The method according to any one of claims 1 to 4 in which the toner includes both the epoxy resin and a hardener component but in an amount insufficient to effect full cross-linking with the remaining amount of hardener carried by the receptor coating.
Claim 8
Independent Claim
27 words
The method according to any one of claims 1 to 6 wherein the receptor substrate is formed of one of aluminum, cold rolled steel or stainless steel.
Claim 9
Dependent Claim
55 words
A printing plate resulting from the practice of the method according to any one of claims 1 to 7 formed of a metal sheet and raised oleophillic image printing areas bonded to the surface of said metal sheet surface and non-printing areas; said printing areas comprising a two-component epoxy polymer that is polymerized in situ.
Claim 10
Dependent Claim
23 words
The printing plate according to claim 8 in which said metal sheet is formed of one of aluminum, stainless steel or cold-rolled steel.
Claim 11
Dependent Claim
20 words
The printing plate according to claims a or 9 in which said metal sheet surface has roughened or brushed finish.
References Cited (Backward Citations)
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