US4702983A
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Electrophotographic photoreceptor comprising bis-azo pigment
Assignee: Hodogaya Chemical Co Ltd
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Filing: 1987-01-20
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Granted: 1987-10-27
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Expires: 2007-01-20
Abstract
Abstract An electrophotographic photoreceptor excellent in properties after repeated use and durability is provided by containing a bis-azo pigment represented by the following general formula [I] or [II] in the light-sensitive layer on the conductive support: ##STR1## wherein X represents --O--, --S--or >N--R 4 wherein R 4 represents a hydrogen atom, an alkyl group or an aralkyl group, R 1 , R 2 and R 3 each represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or a group of atoms necessary to form a condensed ring by combination of two or them, Y 1 and Y 2 each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, A represents a coupler residue necessary to produce an azo pigment and n is 0 or 1; ##STR2## wherein Y 1 and Y 2 each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, R 1 and R 2 each represent a hydrogen atom, an alkyl group, an alkoxy group or a group of atoms necessary to form a condensed ring by combination of them, A represents a coupler residue necessary to produce an azo pigment and n is 0 or 1.
Inventors
- 👤 Kozo Haino
- 👤 Kazuhiro Emoto
- 👤 Akira Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:24
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0681; G03G5/0683; G03G5/0685
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
An electrophotographic photoreceptor which comprises a conductive support and a light-sensitive layer thereon containing a bis-azo pigment represented by the following general formula [I] or [II]: wherein X represents --O--, --S-- or >N--R 4 where R 4 represents a hydrogen atom, an alkyl group or an aralkyl group, R 1 , R 2 and R 3 each represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or two of R 1 , R 2 and R 3 being a group of atoms necessary to form a condensed ring by combination of them, Y 1 and Y 2 each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, A represents a coupler residue necessary to produce an azo pigment and n is 0 or 1; ##STR23## wherein Y 1 and Y 2 each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, R 1 and R 2 each represent a hydrogen atom, an alkyl group, an alkoxy group or a group of atoms necessary to form a condensed ring by combination of R 1 and R 2 , A represents a coupler residue necessary to produce an azo pigment and n is 0 or 1.
Claim 2
Dependent Claim
208 words
An electrophotographic photoreceptor which comprises a conductive support and a light-sensitive layer thereon containing a bis-azo pigment represented by the following general formula [I] or [II]: wherein X represents --O--, --S-- or >N--R 4 where R 4 represents a hydrogen atom, an alkyl group or an aralkyl group, R 1 , R 2 and R 3 each represent a hydrogen atom, an alkyl group, an alkoxy group, an aryl group or two of R 1 , R 2 and R 3 being a group of atoms necessary to form a condensed ring by combination of them, Y 1 and Y 2 each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, A represents a coupler residue necessary to produce an azo pigment and n is 0 or 1; ##STR23## wherein Y 1 and Y 2 each represent a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group, R 1 and R 2 each represent a hydrogen atom, an alkyl group, an alkoxy group or a group of atoms necessary to form a condensed ring by combination of R 1 and R 2 , A represents a coupler residue necessary to produce an azo pigment and n is 0 or 1.
Claim 3
Dependent Claim
71 words
An electrophotographic photoreceptor wherein the bis-azo pigment has the following general formula [II-a]: ##STR24## wherein Y 1 , Y 2 , R 1 and R 2 and n are the same as defined in the general formula [II], A is ##STR25## where m is 1 or 2, R 3 represents a hydrogen atom, a halogen atom, an alkyl group, cyano group and an alkoxy group and Z represents a condensed ring.
Claim 4
Dependent Claim
71 words
An electrophotographic photoreceptor wherein the bis-azo pigment has the following general formula [II-a]: ##STR24## wherein Y 1 , Y 2 , R 1 and R 2 and n are the same as defined in the general formula [II], A is ##STR25## where m is 1 or 2, R 3 represents a hydrogen atom, a halogen atom, an alkyl group, cyano group and an alkoxy group and Z represents a condensed ring.
Claim 5
Dependent Claim
25 words
An electrophotographic photoreceptor according to claim 1 wherein the light-sensitive layer comprises a charge generating layer containing the bis-azo pigment and a charge transport layer.
Claim 6
Dependent Claim
18 words
An electrophotographic photoreceptor according to claim 1, wherein the light-sensitive layer comprises the bis-azo pigment and a binder.
Claim 7
Dependent Claim
21 words
An electrophotographic photoreceptor according to claim 4 wherein amount of the binder is 0.1-5 times the weight of the bis-azo pigment.
Claim 8
Dependent Claim
29 words
An electrophotographic process which comprises electrostatically charging the surface of the photoreceptor of claim 1, exposing it in imagewise fashion and then discharging the surface in the imagewise fashion.
References Cited (Backward Citations)
US4582771A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |