US3929478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic element which includes a photoconductive polyvinyl carbazole layer containing an alicyclic anhydride
Assignee: AB Dick Co
•
Filing: 1974-08-28
•
Granted: 1975-12-30
•
Expires: 1994-08-28
Abstract
Abstract For use in an electrophotographic copy process, a photoconductive element formed of an organic photoconductive composition on a suitable substrate, in which the speed and charge retention of the organic photoconductor, preferably a polymerized vinyl carbazole and 2,4,7-trinitro-9-fluorenone, is improved by the presence of an alicyclic anhydride in an amount within the range of 0.01% to 1.0% by weight of the coated solids.
Inventors
- 👤 Denis J Curtin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:34
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0601; G03G5/0609; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
IN AN ELECTROPHOTOGRAPHIC ELEMENT FOR USE IN AN ELECTROPHOTOGRAPHIC COPY PROCESS FORMED OF A SUBSTRATE HAVING AN ORGANIC PHOTOCONDUCTIVE COATING FORMED OF 2,4,7-TRINITRO-9FLUORENONE AND A POLYMERIZED VINYL CARBAZOLE PRESENT IN THE RATIO OF 0.49 TO 1.23 MOLES OF THE TRINITRO FLUORENONE PER MONOMERIC UNIT OF POLYMERIZED VINYL CARBAZOLE ON ONE SURFACE, THE IMPROVEMENT WHEREIN AN ALICYCLIC ANHYDRIDE IS INCORPORATED INTO THE ORGANIC PHOTOCONDUCTIVE COMPOSITION WHEREBY THE CHARGE RETENTION AND SENSITIVITY OF THE PHOTOCONDUCTIVE COATING IS MARKEDLY IMPROVED TO INCREASE COPY SPEED.
Claim 2
Dependent Claim
81 words
IN AN ELECTROPHOTOGRAPHIC ELEMENT FOR USE IN AN ELECTROPHOTOGRAPHIC COPY PROCESS FORMED OF A SUBSTRATE HAVING AN ORGANIC PHOTOCONDUCTIVE COATING FORMED OF 2,4,7-TRINITRO-9FLUORENONE AND A POLYMERIZED VINYL CARBAZOLE PRESENT IN THE RATIO OF 0.49 TO 1.23 MOLES OF THE TRINITRO FLUORENONE PER MONOMERIC UNIT OF POLYMERIZED VINYL CARBAZOLE ON ONE SURFACE, THE IMPROVEMENT WHEREIN AN ALICYCLIC ANHYDRIDE IS INCORPORATED INTO THE ORGANIC PHOTOCONDUCTIVE COMPOSITION WHEREBY THE CHARGE RETENTION AND SENSITIVITY OF THE PHOTOCONDUCTIVE COATING IS MARKEDLY IMPROVED TO INCREASE COPY SPEED.
Claim 3
Dependent Claim
34 words
An electrophotographic element as claimed in claim 1 in which the alicyclic anhydride is present in the coating in an amount within the range of 0.01% to 1.0% by weight of the coating solids.
Claim 4
Dependent Claim
34 words
An electrophotographic element as claimed in claim 1 in which the alicyclic anhydride is present in the coating in an amount within the range of 0.02% to 0.5% by weight of the coating solids.
Claim 5
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1 in which the photoconductive coating is of a thickness within the range of 5-30 microns.
Claim 6
Dependent Claim
23 words
An electrophotographic element as claimed in claim 1 in which the photoconductive coating is of a thickness within the range of 8-15 microns.
Claim 7
Dependent Claim
17 words
An electrophotographic element as claimed in claim 1 in which the polymerized vinyl carbazole is poly-N-vinyl carbazole.
Claim 8
Dependent Claim
31 words
An electrophotographic element as claimed in claim 1 in which the cyclic group of the alicyclic anhydride is selected from the group consisting of cyclobutane, cyclopentane and cyclohexane, and substituents thereof.
Claim 9
Dependent Claim
58 words
An organic photoconductive composition for use in the preparation of a photoconductive coating from which copies can be produced by an electrophotographic process, in which the composition consists essentially of an organic photoconductor and 0.1% to 1.0% by weight (based on coating solids) of an alicyclic anhydride having from 3 to 20 carbon atoms in the alicyclic group.
Claim 10
Dependent Claim
58 words
An organic photoconductive composition for use in the preparation of a photoconductive coating from which copies can be produced by an electrophotographic process, in which the composition consists essentially of an organic photoconductor and 0.1% to 1.0% by weight (based on coating solids) of an alicyclic anhydride having from 3 to 20 carbon atoms in the alicyclic group.
Claim 11
Dependent Claim
54 words
A composition as claimed in claim 8 in which the organic photoconductor comprises 2,4,7-trinitro-9-fluorenone and a polymerized vinyl carbazole present in the ratio of about 0.49 to 1.23 moles of the trinitro fluorenone per monomeric unit of the polymerized vinyl carbazole and in which the materials are present in solution in an organic solvent.
Claim 12
Dependent Claim
30 words
A composition as claimed in claim 9 in which the alicyclic anhydride is present in an amount within the range of 0.02% to 0.5% by weight of the coated solids.
Claim 13
Dependent Claim
21 words
A composition as claimed in claim 9 in which the organic solvent in which the photoconductive materials are dissolved is tetrahydrofuran.
Claim 14
Dependent Claim
30 words
A composition as claimed in claim 8 in which the alicyclic group of the alicyclic anhydride is selected from the group consisting of cyclobutane, cyclopentane and cyclohexane, and derivatives thereof.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |