US4734348A
Expired / Lapsed
US
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Photosensitive member for electrophotography containing polyvinyl acetal
Assignee: Mitsubishi Chemical Corp
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Filing: 1986-10-17
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Granted: 1988-03-29
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Expires: 2006-10-17
Abstract
Abstract A photosensitive member for electrophotography comprising at least a photoconductive layer on a conductive substrate, the photoconductive layer containing polyvinyl acetal having a constituent unit represented by the following general formula [I]: <IMAGE> [I] wherein Ar represents an aryl group, R1 a hydrogen atom, a lower alkyl group or an arly group, and m an integer of 0 or 1-3, and a constituent unit represented by the following general formula [II]: <IMAGE> [II] wherein R2 represents a hydrogen atom or an acyl group, the constituent unit of the general formula [I] being 40 mole % or more, and the total of the constituent units of the general formulae [I] and [II] being 60 mole % or more. This photosensitive layer has high sensitivity and durability and low residual potential.
Inventors
- 👤 Tetsumi Suzuki
- 👤 Tetsuo Murayama
- 👤 Shinji Aramaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:58
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0528; G03G5/0532; G03G5/0542; C; C08; C08F; C08F8/00; C08F8/48; C08J; C08J5/00; C08J5/18; C09; C09D; C09D129/00; C09D129/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A photosensitive member for electrophotography comprising at least a photoconductive layer on a conductive substrate, said photoconductive layer containing an organic photoconductive compound and a binder polymer, and said binder polymer comprising polyvinyl acetal having a repeating unit represented by the following general formula [I]: ##STR19## wherein Ar represents an aryl group, R 1 a hydrogen atom, a lower alkyl group or an aryl group, and m an integer of 0 or 1-3, and a repeating unit represented by the following general formula [II]: ##STR20## wherein R 2 represents a hydrogen atom or an acyl group, said repeating unit of the general formula [I] being 40 mole % or more, and the total of said repeating units of the general formulae [I] and [II] being 60 mole % or more.
Claim 2
Dependent Claim
130 words
A photosensitive member for electrophotography comprising at least a photoconductive layer on a conductive substrate, said photoconductive layer containing an organic photoconductive compound and a binder polymer, and said binder polymer comprising polyvinyl acetal having a repeating unit represented by the following general formula [I]: ##STR19## wherein Ar represents an aryl group, R 1 a hydrogen atom, a lower alkyl group or an aryl group, and m an integer of 0 or 1-3, and a repeating unit represented by the following general formula [II]: ##STR20## wherein R 2 represents a hydrogen atom or an acyl group, said repeating unit of the general formula [I] being 40 mole % or more, and the total of said repeating units of the general formulae [I] and [II] being 60 mole % or more.
Claim 3
Dependent Claim
25 words
The photosensitive member for electrophotography according to claim 1, wherein said organic photoconductive compound is in the form of photoconductive particles dispersed in a binder.
Claim 4
Dependent Claim
17 words
The photosensitive member for electrophotography according to claim 2, said photoconductive layer contains a charge carrier-transporting medium.
Claim 5
Dependent Claim
17 words
The photosensitive member for electrophotography according to claim 1, wherein said photoconductive layer further contains a sensitizer.
Claim 6
Dependent Claim
45 words
The photosensitive member for electrophotography according to claim 1, wherein said photoconductive layer is a laminate composed of a charge carrier generating layer and a charge carrier transport layer, and said polyvinyl acetal is contained as a binder polymer in said charge carrier generating layer.
Claim 7
Dependent Claim
45 words
The photosensitive member for electrophotography according to claim 1, wherein said photoconductive layer is a laminate composed of a charge carrier generating layer and a charge carrier transport layer, and said polyvinyl acetal is contained as a binder polymer in said charge carrier transport layer.
Claim 8
Dependent Claim
48 words
The photosensitive member for electrophotography according to claim 1, wherein the repeating unit of the general formula [I] is 50 mole percent or more, and the total of the repeating units of the general formulae [I] and [II] is 70 mole percent or more in said polyvinyl acetal.
Claim 9
Dependent Claim
28 words
The photosensitive member for electrophotography according to claim 1, wherein Ar in the general formula [I] is a monovalent group derived from a substituted or unsubstituted aromatic hydrocarbon.
Claim 10
Dependent Claim
28 words
The photosensitive member for electrophotography according to claim 1, wherein R 2 in the general formula [II] is a lower aliphatic acyl group or an aromatic acyl group.
Claim 11
Dependent Claim
25 words
The photosensitive member for electrophotography according to claim 1, wherein R 2 in the general formula [II] is a hydrogen atom or an acetyl group.
References Cited (Backward Citations)
US3844985A
Cited
US4492747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-29 | 1991-09-28 | 1992-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-29 | 1995-09-28 | 1996-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-29 | 1999-09-28 | 2000-03-29 | $7700.00 | Window Closed / Lapsed |