Patent US3652272A successfully refreshed from Google Patents.
US3652272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phenoxy photopolymer having no epoxy groups, and article made therefrom
Assignee: Imperial Metal and Chemical Co
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Filing: 1969-10-31
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Granted: 1972-03-28
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Expires: 1989-10-31
Abstract
Abstract A photopolymer adapted for use in lithography, photomechanical processes, or other applications, consisting essentially of an actinic light-tanned product of a phenoxy resin of high molecular weight formed in the presence of a sensitizer which is a diazo resin or a chromium compound, such as ammonium bichromate. A photopolymer-yielding system or combination consisting essentially of a phenoxy resin and a sensitizer, which is a diazo resin or chromium compound yielding hexavalent chromium, the resin and sensitizer being in contact with each other. A lithographic plate including such photopolymer or such photopolymer-yielding system or combination. A method of making such photopolymer, comprising subjecting such photopolymer system or combination to treatment with actinic light.
Inventors
- 👤 Daniel C Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:35
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021; G03F7/0212; C; C08; C08L; C08L71/00; G03F7/038; G03F7/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
A photopolymer-yielding system adapted for use in making a lithographic printing surface, consisting of (a) a phenoxy resin having no epoxy groups and having a molecular weight of at least 20,000, containing 6 percent hydroxyl groups and being a condensation product of bisphenol-A and epichlorohydrin, and (b) a photosensitizing agent selected from the group consisting of diazo resins, salts of chromic acid and chromium compounds each capable of yielding hexavalent chromium, the phenoxy resin and photosensitizing agent being in contact with each other in the system.
Claim 2
Dependent Claim
17 words
A system as in claim 2 wherein the phenoxy resin has a molecular weight of about 30,000.
Claim 3
Dependent Claim
20 words
A system as in claim 2 wherein the photosensitizing agent is a condensate of formaldehyde and para diazo diphenylamine sulfate.
Claim 4
Dependent Claim
13 words
A system as in claim 2 wherein the photosensitizing agent is ammonium dichromate.
Claim 5
Dependent Claim
99 words
A negative-working lithographic plate comprising a base support, a barrier layer on the support, and a photopolymer-yielding system coating the barrier layer and consisting essentially of (1) a phenoxy resin having no epoxy groups and having a molecular weight of at least 20,000, containing 6 percent hydroxyl groups and Being a condensation product of bisphenol-A and epichlorohydrin, and (2) a photosensitizing agent selected from the group consisting of diazo resins, salts of chromic acid and chromium compounds each capable of yielding hexavalent chromium, the phenoxy resin and the photosensitizing agent being in contact with each other in the system.
Claim 6
Dependent Claim
31 words
The plate of claim 6 wherein the system consists of a layer of the photosensitizing agent coating the barrier layer and a layer of the phenoxy resin coating the photosensitizing layer.
Claim 7
Dependent Claim
32 words
The plate of claim 6 wherein the system consists of a layer of the phenoxy resin coating the barrier layer and a layer of the photosensitizing agent coating the phenoxy resin layer.
Claim 8
Dependent Claim
24 words
A plate as in claim 6 wherein the system consists of a layer of an admixture of the phenoxy resin and the photosensitizing agent.
Claim 9
Dependent Claim
13 words
A plate as in claim 6 wherein the photosensitizing agent is ammonium dichromate.
Claim 10
Dependent Claim
14 words
A plate as in claim 6 wherein the photosensitizing agent is a diazo resin.
Claim 11
Dependent Claim
21 words
A plate as in claim 11 wherein the diazo resin is a condensation product of formaldehyde and para diazo diphenylamine sulfate.
Claim 12
Dependent Claim
97 words
A positive-working lithographic plate comprising a base support, a barrier layer on the support, and a photopolymer-yielding system coating the barrier layer and consisting essentially of (1) a phenoxy-resin having no epoxy groups, having a molecular weight of at least 20,000 and having 6 percent hydroxyl groups and being a condensation product of bisphenol-A and epichlorohydrin, and (2) a photosensitizing agent selected from the group consisting of diazo resins, salts of chromic acid and chromium compounds each capable of yielding hexavalent chromium, and a coating over the photopolymer-yielding system consisting essentially of a hydrophilic organic colloid substance.
Claim 13
Dependent Claim
14 words
A plate as in claim 13 wherein the hydrophilic organic substance is gum arabic.
Claim 14
Dependent Claim
13 words
A plate as in claim 13 wherein the hydrophilic organic substance is polyvinyl-pyrrolidone.
Claim 15
Dependent Claim
89 words
A lithographic plate comprising a base support, a coating thereover consisting of a phenoxy resin having no epoxy groups and a molecular weight of at least 20,000, with 6 percent hydroxyl groups and being a condensation product of bisphenol-A epichlorohydrin, and a coating over the phenoxy resin of a photosensitizing agent selected from the group consisting of diazo resins, salts of chromic acid and chromium compounds each capable of yielding hexavalent chromium, the phenoxy resin and photosensitizing agent adapted to form a photopolymer under the action of actinic light.
References Cited (Backward Citations)
US2690968A
Cited
US3136637A
Cited
US3019106A
Cited
US3278305A
Cited
US3295974A
Cited
US3387976A
Cited
US3427161A
Cited
US3455688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |