US4472491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic recording material having protective layer and process for the production thereof
Assignee: Hoechst AG
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Filing: 1982-05-26
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Granted: 1984-09-18
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Expires: 2002-05-26
Abstract
Abstract An electrophotographic recording material comprised of an electrically conductive support, an optional insulating interlayer, a photoconductive system comprised of at least one layer of organic material containing a charge carrier-producing compound and a charge-transporting compound, and a radiation-cured, transparent protective layer, wherein the protective layer has been applied onto the surface of the photoconductive system with the aid of a removable auxiliary support and is comprised of an acrylated binder which is cured by irradiation with ultraviolet light. Also disclosed is a process for the production of the recording material.
Inventors
- 👤 Wolfgang Wiedemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:36
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/147; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10; Y10S430/162
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
An electrophotographic recording material, consisting essentially of: an electrically conductive support; a photoconductive system coated on said conductive support and comprising at least one layer of organic material containing a charge carrier-producing compound and a charge-transporting compound; an ultraviolet radiation-cured; transparent protective layer adjacent to said photoconductive system and comprising an acrylated binder; and a removable auxiliary support adjacent to the protective layer; wherein the protective layer has been applied onto the surface of the photoconductive system by lamination together with the removable auxiliary support.
Claim 2
Dependent Claim
85 words
An electrophotographic recording material, consisting essentially of: an electrically conductive support; a photoconductive system coated on said conductive support and comprising at least one layer of organic material containing a charge carrier-producing compound and a charge-transporting compound; an ultraviolet radiation-cured; transparent protective layer adjacent to said photoconductive system and comprising an acrylated binder; and a removable auxiliary support adjacent to the protective layer; wherein the protective layer has been applied onto the surface of the photoconductive system by lamination together with the removable auxiliary support.
Claim 3
Dependent Claim
24 words
A recording material is claimed in claim 1, wherein the protective layer comprises an acrylated polyurethane, an acrylated polyester or an acrylated epoxide resin.
Claim 4
Dependent Claim
16 words
A recording material as claimed in claim 2, wherein the protective layer comprises an acrylated polyurethane.
Claim 5
Dependent Claim
43 words
A recording material as claimed in claim 3, wherein the acrylated polyurethane has, prior to curing, a viscosity of 300 Pa s at 25° C., a density of 1.15 g/cm 3 at 25° C., and an acid number of max. 0.1 mg KOH/g.
Claim 6
Dependent Claim
30 words
A recording material as claimed in claim 1, wherein the acrylated binder of the protective layer is exposed to ultraviolet radiation in the presence of a reactive diluent during curing.
Claim 7
Dependent Claim
18 words
A recording material as claimed in claim 5, wherein the reactive diluent comprises trimethylol acrylate and/or pentaerythritol tri(tetra)acrylate.
Claim 8
Dependent Claim
29 words
A recording material as claimed in claim 1, wherein the acrylated binder of the protective layer is exposed to ultraviolet radiation in the presence of a photoinitiator during curing.
Claim 9
Dependent Claim
22 words
A recording material as claimed in claim 7, wherein the photoinitiator comprises a substituted α-halogenoacetophenone or benzil dimethyl ketal as the photoinitiator.
Claim 10
Dependent Claim
42 words
A recording material as claimed in claim 1, wherein the protective layer comprises from about 40-80 parts by weight of an acrylated polyurethane, from about 15-50 parts by weight of trimethylol acrylate and from about 1-5 parts by weight of a photoinitiator.
Claim 11
Dependent Claim
19 words
A recording material as claimed in claim 1, wherein the protective layer is from 0.1 to 10 μm thick.
Claim 12
Dependent Claim
19 words
A recording material as claimed in claim 1, further comprising an insulating interlayer located adjacent to said conductive support.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-18 | 1988-03-19 | 1988-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-18 | 1992-03-19 | 1992-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-18 | 1996-03-19 | 1996-09-18 | $7700.00 | Window Closed / Lapsed |