US4956256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive member for electrophotography
Assignee: Mitsubishi Chemical Corp
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Filing: 1989-06-09
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Granted: 1990-09-11
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Expires: 2009-06-09
Abstract
Abstract A photosensitive member for electrophotography comprising a photosensitive layer on a conductive substrate, said photosensitive layer containing as a binder resin a modified polycarbonate resin having the repeating structural units represented by the following general formula (1) and (2); <IMAGE> (1) wherein R1 and R2 are selected from a hydrogen atom, an alkyl group having 1-3 carbon atoms and a halogen atom, at least one of R1 and R2 being the alkyl or the halogen atom, and <IMAGE> (2) the ratio of the repeating structural unit of the general formula (1) to that of the general formula (2) being at least 20:80. This photosensitive member is highly resistant to mechanical wear and the deterioration of sensitivity and chargeability.
Inventors
- 👤 Shigenori Ohtsuka
- 👤 Hiroshi Urabe
- 👤 Masahiro Nukui
- 👤 Mamoru Nozomi
- 👤 Setsuko Sasakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:59
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0564
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A photosensitive member for electrophotography comprising a photosensitive layer on a conductive substrate, said photosensitive layer containing as a binder resin a modified polycarbonate resin having the repeating structural unit represented by the following general formula (1): ##STR23## wherein R 1 and R 2 are selected from a hydrogen atom, an alkyl group having 1-3 carbon atoms and a halogen atom, at least one of R 1 and R 2 being the alkyl group or the halogen atom.
Claim 2
Dependent Claim
78 words
A photosensitive member for electrophotography comprising a photosensitive layer on a conductive substrate, said photosensitive layer containing as a binder resin a modified polycarbonate resin having the repeating structural unit represented by the following general formula (1): ##STR23## wherein R 1 and R 2 are selected from a hydrogen atom, an alkyl group having 1-3 carbon atoms and a halogen atom, at least one of R 1 and R 2 being the alkyl group or the halogen atom.
Claim 3
Dependent Claim
93 words
The photosensitive member for electrophotography according to claim 1, wherein said modified polycarbonate resin has the repeating structural units represented by the following general formula (1) and (2): ##STR24## wherein R 1 and R 2 are selected from a hydrogen atom, an alkyl group having 1-3 carbon atoms and a halogen atom, at least one of R 1 and R 2 being the alkyl or the halogen atom, and ##STR25## the ratio of the repeating structural unit of the general formula (1) to that of the general formula (2) being at least 20:80.
Claim 4
Dependent Claim
21 words
The photosensitive member for electrophotography according to claim 1, wherein said modified polycarbonate resin has a viscosity-average molecular weight of 10,000-50,000.
Claim 5
Dependent Claim
21 words
The photosensitive member for electrophotography according to claim 3, wherein said modified polycarbonate resin has a viscosity-average molecular weight of 10,000-50,000.
Claim 6
Dependent Claim
45 words
The photosensitive member for electrophotography according to claim 1, wherein said photosensitive member is constituted by a charge carrier-generating layer and a charge carrier transfer layer constructed thereon, and said modified polycarbonate resin is contained as a binder resin in said charge carrier transfer layer.
Claim 7
Dependent Claim
45 words
The photosensitive member for electrophotography according to claim 2, wherein said photosensitive member is constituted by a charge carrier-generating layer and a charge carrier transfer layer constructed thereon, and said modified polycarbonate resin is contained as a binder resin in said charge carrier transfer layer.
Claim 8
Dependent Claim
36 words
The photosensitive member for electrophotography according to claim 1, wherein said photosensitive layer has a matrix phase containing a charge carrier transfer material and a binder resin, in which a charge carrier-generating material particles are dispersed.
Claim 9
Dependent Claim
36 words
The photosensitive member for electrophotography according to claim 2, wherein said photosensitive layer has a matrix phase containing a charge carrier transfer material and a binder resin, in which a charge carrier-generating material particles are dispersed.
References Cited (Backward Citations)
US4637971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |