Patent US4933248A successfully refreshed from Google Patents.
US4933248A
Expired / Lapsed
US
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Electrophotographic recording material
Assignee: Hoechst AG
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Filing: 1989-01-11
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Granted: 1990-06-12
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Expires: 2009-01-11
Abstract
Abstract An electrophotographic recording material is disclosed that comprises an electrically conducting layer support being in particular suitable for the production of printing plates or printed circuits, and a photoconductive layer comprising an organic photoconductor, a phenolic resin as the binder, a sensitizer and customary additives. The binder employed is an optionally substituted polyvinylphenol which has a molecular weight (weight average) of preferably between 1,500 and 60,000. The polyvinylphenol may be halogenated, preferably brominated. Furthermore, an o-quinonediazide may be contained in the photoconductive layer. The recording material is distinguished by a high charging capacity, good photosensitivity and excellent solubility properties. It is suitable for the reproduction of fine image elements.
Inventors
- 👤 Erwin Lind
- 👤 Franz Freimuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:42
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0532; G03G5/0535
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
24 words
An electrophotographic recording material, comprising: an electrically conducting layer support; a photoconductive layer comprising an organic photoconductor, a polyvinylphenol resin binder, and a sensitizer.
Claim 2
Dependent Claim
24 words
An electrophotographic recording material, comprising: an electrically conducting layer support; a photoconductive layer comprising an organic photoconductor, a polyvinylphenol resin binder, and a sensitizer.
Claim 3
Dependent Claim
22 words
A recording material as claimed in claim 1, wherein the polyvinylphenol has a molecular weight (weight average) of between 1,500 and 60,000.
Claim 4
Dependent Claim
16 words
A recording material as claimed in claim 1, wherein the polyvinylphenol is a polymer of pvinylphenol.
Claim 5
Dependent Claim
13 words
A recording material as claimed in claim 1, wherein the polyvinylphenol is halogenated.
Claim 6
Dependent Claim
13 words
A recording material as claimed in claim 4, wherein the polyvinylphenol is brominated.
Claim 7
Dependent Claim
16 words
A recording material as claimed in claim 1, wherein the photoconductive layer additionally comprises an o-quinonediazide.
Claim 8
Dependent Claim
16 words
A recording material as claimed in claim 1, wherein the photoconductive layer additionally comprises an o-naphthoquinonediazide.
Claim 9
Dependent Claim
26 words
An electrophotographic recording material as claimed in claim 1, wherein the electrically conducting layer support is suitable for the production of printing plates and printed circuits.
Claim 10
Dependent Claim
25 words
An electrophotographic recording material as claimed in claim 1, additionally comprising at least one selected from the group consisting of flow control agents and plasticizers.
Claim 11
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 1, additionally comprising an adhesion promoter between the layer support and the photoconductive layer.
Claim 12
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 6, wherein the photoconductive layer comprises from 5% to 40% by weight of o-quinonediazide.
Claim 13
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 6, wherein the photoconductive layer comprises from 15% to 25% by weight of o-quinonediazide.
Claim 14
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 7, wherein the photoconductive layer comprises from 5% to 40% by weight of o-naphthoquinonediazide.
Claim 15
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 7, wherein the photoconductive layer comprises from 15% to 25% by weight of o-naphthoquinonediazide.
Claim 16
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 4, wherein the polyvinylphenol has a halogen content of 20% to 60% by weight.
Claim 17
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 4, wherein the polyvinylphenol has a halogen content of 40% to 60% by weight.
Claim 18
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 5, wherein the polyvinylphenol has a bromine content of 20% to 60% by weight.
Claim 19
Dependent Claim
22 words
An electrophotographic recording material as claimed in claim 5, wherein the polyvinylphenol has a bromine content of 40% to 60% by weight.
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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) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |