US4851314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic photosensitive member with combined polycarbonate resins
Assignee: Canon Inc
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Filing: 1986-12-31
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Granted: 1989-07-25
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Expires: 2006-12-31
Abstract
Abstract An electrophotographic photosensitive member comprises a photosensitive layer on an electroconductive substrate, and photosensitive layer comprising at least one polycarbonate resins (I) having a number average molecular weight of 1.5×10 4 or less and at least one of polycarbonate resins (II) having a number average molecular weight of 4.5×10 4 or more, said polycarbonate resin (I) being contained at a proportion of 30 parts by weight to 95 parts by weight based on the composition comprising the polycarbonate resins (I) and (II).
Inventors
- 👤 Toshiyuki Yoshihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:32
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0557; G03G5/0564
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
An electrophotographic photosensitive member comprising a photosensitive layer of a charge generation layer and a charge transport layer on an electroconductive substrate, the surface layer of said charge transport layer comprising at least one of polycarbonate resins (I) having a number average molecular weight of 1.5×10 4 or less and at least one of polycarbonate resins (II) having a number average molecular weight of 4.5×10 4 or more, said polycarbonate resin (I) being contained at a proportion of 30 parts by weight to 95 parts by weight based on 100 parts by weight of the composition comprising the polycarbonate resins (I) and (II).
Claim 2
Dependent Claim
103 words
An electrophotographic photosensitive member comprising a photosensitive layer of a charge generation layer and a charge transport layer on an electroconductive substrate, the surface layer of said charge transport layer comprising at least one of polycarbonate resins (I) having a number average molecular weight of 1.5×10 4 or less and at least one of polycarbonate resins (II) having a number average molecular weight of 4.5×10 4 or more, said polycarbonate resin (I) being contained at a proportion of 30 parts by weight to 95 parts by weight based on 100 parts by weight of the composition comprising the polycarbonate resins (I) and (II).
Claim 3
Dependent Claim
22 words
An electrophotographic photosensitive member according to claim 1, wherein said charge transport layer is provided by coating on the charge generation layer.
Claim 4
Dependent Claim
37 words
An electrophotographic photosensitive member according to claim 1, wherein the mixing ratio of the charge transporting material contained in said charge transport layer to the composition comprising the polycarbonate resins (I) and (II) is 2:1 to 1:2.
Claim 5
Dependent Claim
43 words
An electrophotographic photosensitive member according to claim 1, wherein the charge transporting substance contained in said charge transport layer is a carbazole type compound, hydrazone type compound, pyrazoline type compound, oxazole type compound, thiazole type compound, triarylmethane type compound or polyarylalkane type compound.
Claim 6
Dependent Claim
23 words
An electrophotographic photosensitive member according to claim 1, wherein said charge transport layer has a film thickness ranging from 5 to 40 μm.
Claim 7
Dependent Claim
37 words
An electrophotographic photosensitive member according to claim 2, wherein the mixing ratio of the charge transporting material contained in said charge transport layer to the composition comprising the polycarbonate resins (I) and (II) is 2:1 to 1:2.
Claim 8
Dependent Claim
43 words
An electrophotographic photosensitive member according to claim 2, wherein the charge transporting substance contained in said charge transport layer is a carbazole type compound, hydrazone type compound, pyrazoline type compound, oxazole type compound, thiazole type compound, triarylmethane type compound or polyarylalkane type compound.
Claim 9
Dependent Claim
23 words
An electrophotographic photosensitive member according to claim 2, wherein said charge transport layer has a film thickness ranging from 5 to 40 μm.
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) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |