US4076526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoconductive N-vinyl carbazole copolymers and process for preparing same
Assignee: Sherwin Williams Co
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Filing: 1977-02-11
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Granted: 1978-02-28
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Expires: 1997-02-11
Abstract
Abstract The invention relates to photoconductive N-vinyl carbazole copolymers characterized as having electron donor and electron acceptor groups in the same polymeric chain and the use of said copolymers as photoconductive materials on various substrates.
Inventors
- 👤 James E. Mulvaney
- 👤 Raymond W. Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:57
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/07; G03G5/071; G03G5/072; G03G5/073; C; C08; C08F; C08F8/00; C08F8/14; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
A photoconductive N-vinyl carbazole copolymer having electron donor and electron acceptor groups in the same polymer chain characterized by a repeat unit of the formula: ##STR3## wherein x has a value of at least two.
Claim 2
Dependent Claim
35 words
A photoconductive N-vinyl carbazole copolymer having electron donor and electron acceptor groups in the same polymer chain characterized by a repeat unit of the formula: ##STR3## wherein x has a value of at least two.
Claim 3
Dependent Claim
97 words
A process for preparing a photoconductive copolymer having electron donor and electron acceptor groups in the same polymer chain which comprises polymerizing N-vinyl carbazole and vinyl acetate in an organic medium in the presence of a free-radical catalyst at temperatures of at least 25° C to obtain N-vinyl carbazole-vinyl acetate copolymer; hydrolyzing said copolymer to obtain N-vinylcarbazole-vinyl alcohol copolymer and subsequently reacting said vinyl alcohol copolymer with approximately one mole of dinitrobenzoyl halide for each vinyl alcohol group in the copolymer to obtain copolymer having N-vinyl carbazole and vinyldinitrobenzoate groups bonded to the backbone of the polymer.
Claim 4
Dependent Claim
97 words
A process for preparing a photoconductive copolymer having electron donor and electron acceptor groups in the same polymer chain which comprises polymerizing N-vinyl carbazole and vinyl acetate in an organic medium in the presence of a free-radical catalyst at temperatures of at least 25° C to obtain N-vinyl carbazole-vinyl acetate copolymer; hydrolyzing said copolymer to obtain N-vinylcarbazole-vinyl alcohol copolymer and subsequently reacting said vinyl alcohol copolymer with approximately one mole of dinitrobenzoyl halide for each vinyl alcohol group in the copolymer to obtain copolymer having N-vinyl carbazole and vinyldinitrobenzoate groups bonded to the backbone of the polymer.
Claim 5
Dependent Claim
17 words
The photoconductive N-vinyl carbazole copolymer of claim 1 further characterized as being a N-vinyl carbazole-vinyl 3,5-dinitrobenzoate copolymer.
Claim 6
Dependent Claim
34 words
The process of claim 2 further characterized in that the N-vinyl carbazole and vinyl acetate are copolymerized in an organic medium comprising an aromatic hydrocarbon at temperatures ranging from about 60° to 70° C.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |