US4732831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xeroprinting with photopolymer master
Assignee: EIDP Inc
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Filing: 1987-06-01
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Granted: 1988-03-22
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Expires: 2007-06-01
Abstract
Abstract Xeroprinting process involving imagewise exposing a photopolymer master, charging on a conductive support, toning with dry or liquid electrostatic toner, and transferring to another surface. Photopolymer systems comprising preferred combinations of polymeric binders, ethylenically unsaturated monomers. HABI initiators and chain transfer agents.
Inventors
- 👤 James Riesenfeld
- 👤 William Bindloss
- 👤 Graciella Blanchet
- 👤 Rolf Dessauer
- 👤 Alan S. Dubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:28
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/026; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/065
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
114 words
A xeroprinting process which utilizes a suspension of electrostatically charged toner particles in a dispersant liquid to develop an oppositely-charged electrostatic image on a photopolymer master and which comprises the steps: (1) imagewise exposing to actinic radiation an electrostatic photopolymer master having a photopolymerizable resistivity in exposed areas of the layer; (2) without removing unexposed areas of the layer, charging the master by corona discharge while on a conductive support to form a latent image of electrostatic charge on the exposed areas; (3) developing the image by applying to both exposed and unexposed areas of the master the suspension of oppositely charged electrostatic toner particles; and (4) transferring the toner image to another surface.
Claim 2
Dependent Claim
114 words
A xeroprinting process which utilizes a suspension of electrostatically charged toner particles in a dispersant liquid to develop an oppositely-charged electrostatic image on a photopolymer master and which comprises the steps: (1) imagewise exposing to actinic radiation an electrostatic photopolymer master having a photopolymerizable resistivity in exposed areas of the layer; (2) without removing unexposed areas of the layer, charging the master by corona discharge while on a conductive support to form a latent image of electrostatic charge on the exposed areas; (3) developing the image by applying to both exposed and unexposed areas of the master the suspension of oppositely charged electrostatic toner particles; and (4) transferring the toner image to another surface.
Claim 3
Dependent Claim
21 words
Improved process of claim 1 wherein steps (2), (3) and (4) are repeated to produce multiple copies with a single exposure.
Claim 4
Dependent Claim
28 words
Process of claim 2 wherein the photosensitive layer consists essentially of a polymeric binder, an ethylenically unsaturated photopolymerizable monomer, a 2-o-substituted hexaarylbiimidazole photoinitiator, and a chain transfer agent.
Claim 5
Dependent Claim
30 words
Process of claim 3 wherein the resistivity of the monomer is 10 5 to 10 9 ohm·cm and the resistivity of the binder is 10 14 to 10 20 ohm·cm.
Claim 6
Dependent Claim
17 words
Process of claim 4 wherein the resistivity of the binder is 10 14 to 10 16 ohm·cm.
Claim 7
Dependent Claim
17 words
Process of claim 4 wherein the resistivity of the binder is 10 18 to 10 20 ohm·cm.
Claim 8
Dependent Claim
20 words
Process of claim 4 wherein the initiator is a 2-o-substituted hexaphenylbiimidazole and the monomer is a di-, tri- or tetraacrylate.
Claim 9
Dependent Claim
36 words
Process of claim 7 wherein the binder is poly(styrene/methylmethacrylate) or poly(methylmethacrylate), the monomer is ethoxylated trimethylolpropane triacrylate or polyethylene glycol dimethacrylate, the initiator is 2,2',4,4'-tetrakis(o-chlorophenyl)-5,5'-bis(m,p-dimethoxyphenyl)-biimidazole or 2,2'-bis(o-chlorophenyl)-4,4,',5,5'-tetraphenylbiimidazole and the chain transfer agent is 2-mercaptobenzoxazole or 2-mercaptobenzthiazole.
Claim 10
Dependent Claim
11 words
Process of claim 8 wherein the chain transfer agent is 2-mercaptobenzoxazole.
Claim 11
Dependent Claim
9 words
Process of claim 9 wherein the binder is poly(styrene/methylmethacrylate).
Claim 12
Dependent Claim
35 words
Process of claim 9 wherein the binder is polymethylmethacrylate and the process provides a dot range of at least 1 to 97% in the transferred image when exposure is through a 150 line halftone negative.
Claim 13
Dependent Claim
12 words
Process of claim 10 wherein the monomer is ethoxylated trimethylol propane triacrylate.
Claim 14
Dependent Claim
12 words
Process of claim 11 wherein the monomer is ethoxylated trimethylol propane triacrylate.
Claim 15
Dependent Claim
48 words
Process of claim 3 wherein exposure is made through a process-color separation halftone negative, the charged master is toned with the corresponding process-color toner, and the toner image is transferred to transparent polymeric film or paper, to provide one layer of a 4-color overlay or surprint color proof.
Claim 16
Dependent Claim
33 words
Process of claim 14 wherein a 4-color surprint on paper is prepared by exposing, charging and toning four masters and the toner image from each master is transferred to the same paper surface.
Claim 17
Dependent Claim
53 words
Process of claim 4 wherein the photoinitiator concentration is 10 to 30% by weight based on the weight of the photosensitive layer, the chain transfer agent is 2-mercaptobenzoxazole or 2-mercaptobenzthiazole, and both the photoinitiator and chain transfer agent are substantially free of components removable by recrystallization from a methylene chloride and methanol mixture.
Claim 18
Dependent Claim
18 words
Process of claim 16 wherein the imagewise exposure is digital exposure by means of a modulated laser beam.
Claim 19
Dependent Claim
40 words
Process of claim 1 wherein prior to exposure a film comprising the photopolymerizable layer on a release layer is laminated to the conductive support with the photopolymerizable layer adjacent the support, and the release layer is removed prior to charging.
Claim 20
Dependent Claim
12 words
Process of claim 18 wherein the release layer is polyethylene or polypropylene.
Claim 21
Dependent Claim
20 words
Process of claim 8 wherein the toner is a suspension of toner particles in a branched chain aliphatic hydrocarbon liquid.
Claim 22
Dependent Claim
20 words
Process of claim 12 wherein the toner is a suspension of toner particles in a branched chain aliphatic hydrocarbon liquid.
Claim 23
Dependent Claim
20 words
Process of claim 13 wherein the toner is a suspension of toner particles in a branched chain aliphatic hydrocarbon liquid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |