Patent US4150987A successfully refreshed from Google Patents.
US4150987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrazone containing charge transport element and photoconductive process of using same
Assignee: IBM Information Products Corp
•
Filing: 1977-10-17
•
Granted: 1979-04-24
•
Expires: 1997-10-17
Abstract
Abstract A process for electrophotographic reproduction, and a layered electrophotographic plate having a conventional charge generation layer and a p-type hydrazone containing charge transport layer, in which the surface of the charge transport layer is selectively discharged by actinic radiation as a result of the migration through the transport layer of charges generated in the charge generation layer as a result of the actinic radiation and injected into the transport layer, the hydrazone having the composition; <IMAGE> <IMAGE> R2=CH3HOCH2CH3 <IMAGE> <IMAGE>
Inventors
- 👤 Howard W. Anderson
- 👤 Michael T. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:22
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0666; G03G5/0668; G03G5/067; G03G5/0601; G03G5/0612; G03G5/0616; G03G5/0618; G03G5/0622; G03G5/0624; G03G5/0635; G03G5/0637; G03G5/0638
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
77 words
A electrophotographic element comprising; an electrically conductive layer; a charge generation layer responsive to actinic radiation to generate an electron-hole pair; and a p-type charge transport layer adjacent the charge generation layer, the charge transport layer comprising a hydrazone of the composition; ##STR24## and a polymeric binder; whereby holes generated by photoelectric phenomenon in the charge generation layer may be transported through the charge transport layer to facilitate localized selective discharge of charged surfaces of the element.
Claim 2
Dependent Claim
77 words
A electrophotographic element comprising; an electrically conductive layer; a charge generation layer responsive to actinic radiation to generate an electron-hole pair; and a p-type charge transport layer adjacent the charge generation layer, the charge transport layer comprising a hydrazone of the composition; ##STR24## and a polymeric binder; whereby holes generated by photoelectric phenomenon in the charge generation layer may be transported through the charge transport layer to facilitate localized selective discharge of charged surfaces of the element.
Claim 3
Dependent Claim
34 words
An electrophotographic element as set forth in claim 1 in which the p-type charge transport layer comprises a hydrazone selected from the group consisting of p-diethylaminobenzaldehyde-(diphenylhydrazone), o-ethoxy-p-diethylaminobenzaldehyde-(diphenylhydrazone), o-methyl-p-diethylaminobenzaldehyde-(diphenylhydrazone), o-methyl-p-dimethylaminobenzaldehyde-(diphenylhydrazone), p-dipropylaminobenzaldehyde-(diphenylhydrazone), p-diethylaminobenzaldehyde-(benzylphenylhydrazone), p-dibutylaminobenzaldehyde-(diphenylhydrazone), and p-dimethylaminobenzaldehyde-(diphenylhydrazone).
Claim 4
Dependent Claim
18 words
An electrophotographic element as set forth in claim 1 in which the p-type charge transport layer includes p-diethylaminobenzaldehyde-(diphenylhydrazone).
Claim 5
Dependent Claim
42 words
An electrophotographic element as set forth in claim 1 in which the charge generation layer is positioned between the electrically conductive layer and the p-type charge transport layer, with the p-type charge transport layer forming an exposed surface of the electrophotographic element.
Claim 6
Dependent Claim
33 words
An electrophotographic element as set forth in claim 1 in which the charge generation layer is responsive to actinic radiation of a wave length greater than 3,900 angstroms to generate an electron-hole pair.
Claim 7
Dependent Claim
37 words
An electrophotographic element as set forth in claim 1 in which the charge generation layer is of a thickness between 0.05 microns to 0.2 microns, and the p-type charge transport layer is at least 5 microns thick.
Claim 8
Dependent Claim
23 words
An electrophotographic element as set forth in claim 6 in which the p-type charge transport layer is between 7 and 35 microns thick.
Claim 9
Dependent Claim
34 words
An electrophotographic element as set forth in claim 1 in which the charge generaton layer comprises a lenium and its alloys, tellurium and its alloys, disazo compounds, and methine dyes derived from squaric acid.
Claim 10
Dependent Claim
27 words
An electrophotographic element as set forth in claim 8 in which the photoconductive material selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium.
Claim 11
Dependent Claim
30 words
An electrophotographic element as set forth in claim 1 in which the polymeric binder is selected from the group consisting of polycarbonate resins, polyester resins, acrylic resins, and mixtures thereof.
Claim 12
Dependent Claim
74 words
An electrophotographic element comprising, in successive layers; a conductive substrate; a charge generation layer responsive to actinic radiation of a wave length greater than 3,900 angstroms to generate an electron-hole pair, the charge generation layer including a photoconductor selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium; and a p-type charge transport layer, the charge transport layer being comprised of a hydrazone of the composition; ##STR25## and a polymeric binder.
Claim 13
Dependent Claim
74 words
An electrophotographic element comprising, in successive layers; a conductive substrate; a charge generation layer responsive to actinic radiation of a wave length greater than 3,900 angstroms to generate an electron-hole pair, the charge generation layer including a photoconductor selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium; and a p-type charge transport layer, the charge transport layer being comprised of a hydrazone of the composition; ##STR25## and a polymeric binder.
Claim 14
Dependent Claim
33 words
An electrophotographic element as set forth in claim 11 in which the p-type charge transport layer comprises a hydrazone selected from the group consisting of p-diethylaminobenzaldehyde-(diphenylhydrazone), o-ethoxy-p-diethylaminobenzaldehyde-(diphenylhydrazone), o-methyl-p-diethylaminobenzaldehdye-(diphenylhydrazone), o-methyl-p-dimethylaminobenzaldehyde-(diphenylhydrazone), p-dipropylaminobenzaldehyde-(diphenylhydrazone), p-diethylaminobenzaldehyde-(benzylphenylhydrazone), and p-dibutylaminobenzaldehyde-(diphenylhydrazone).
Claim 15
Dependent Claim
30 words
An electrophotographic element as set forth in claim 11 in which the polymeric binder is selected from the group consisting of polycarbonate resins, polyester resins, acrylic resins, and mixtures thereof.
Claim 16
Independent Claim
140 words
A method for forming an electrophotographic image comprising the steps of; electrostatically charging in the dark the surface of an electrophotographic plate comprising; a conductive substrate, a charge generation layer responsive to actinic radiation to generate an electron-hole pair, and a p-type charge transport layer adjacent the charge generation layer, the charge transport layer comprising a hydrazone of the composition; ##STR26## and a polymeric binder; exposing the electrophotographic element to an image-wise pattern of actinic radiation; and discharging the surface of the electrophotographic element in an image-wise fashion corresponding to the pattern of the actinic radiation to produce a latent electrostatic image thereon; whereby an electron-hole pair is generated in the charge generation layer at the portion struck by the actinic radiation and the hole is injected into the charge transport layer to discharge the surface of the electrophotographic element.
Claim 17
Independent Claim
140 words
A method for forming an electrophotographic image comprising the steps of; electrostatically charging in the dark the surface of an electrophotographic plate comprising; a conductive substrate, a charge generation layer responsive to actinic radiation to generate an electron-hole pair, and a p-type charge transport layer adjacent the charge generation layer, the charge transport layer comprising a hydrazone of the composition; ##STR26## and a polymeric binder; exposing the electrophotographic element to an image-wise pattern of actinic radiation; and discharging the surface of the electrophotographic element in an image-wise fashion corresponding to the pattern of the actinic radiation to produce a latent electrostatic image thereon; whereby an electron-hole pair is generated in the charge generation layer at the portion struck by the actinic radiation and the hole is injected into the charge transport layer to discharge the surface of the electrophotographic element.
Claim 18
Dependent Claim
94 words
An electrophotographic process as set forth in claim 14 in which the charge generation layer is positioned between the conductive substrate and the charge transport layer and in electrical contact with each, the charge transport layer has an exposed surface layer which is initially negatively charged, and the actinic radiation passes through the charge transport layer to strike the charge generation layer, whereby the resulting holes are injected into and transported through the charge transport layer to discharge negative charges on the surface of the charge transport layer thus producing the latent electrostatic image.
Claim 19
Dependent Claim
77 words
An electrophotographic process as set forth in claim 14 in which the charge transport layer is interposed between the charge generation layer and the conductive substrate, and the charge generation layer is positively charged, whereby holes generated as a result of actinic radiation striking the charge generation layer are injected into and transported through the charge transport layer to the conductive substrate while electrons discharge the surface of the charge generation layer to produce the electrostatic image.
Claim 20
Dependent Claim
34 words
An electrophotographic process as set forth in claim 14 in which the p-type charge transport layer comprises a hydrazone selected from the group consisting of p-diethylaminobenzaldehyde-(diphenylhydrazone), o-ethoxy-p-diethylaminobenzaldehyde-(diphenylhydrazone), o-methyl-p-diethylaminobenzaldehyde-(diphenylhydrazone), o-methyl-p-dimethylaminobenzaldehyde-(diphenylhydrazone), p-dipropylaminobenzaldehyde-(diphenylhydrazone), p-diethylaminobenzaldehyde-(benzylphenylhydrazone), p-dibutylaminobenzaldehyde-(diphenylhydrazone), and p-dimethylaminobenzaldehyde-(diphenylhydrazone).
Claim 21
Dependent Claim
17 words
An electrophotographic process as set forth in claim 14 in which p-type charge transport layer includes p-diethylaminobenzaldehyde-(diphenylhydrazone).
Claim 22
Dependent Claim
41 words
An electrophotographic element as set forth in claim 14 in which the charge generation layer includes a photoconductor selected from the group consisting of selenium and its alloys, tellurium and its alloys, disazo compounds, and methine dyes derived from squaric acid.
Claim 23
Dependent Claim
28 words
An electrophotographic process as set forth in claim 19 in which the photoconductive material is selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium.
Claim 24
Dependent Claim
121 words
An electrophotographic process comprising; negatively charging in the dark the surface of an electrophotographic element comprising in ordered layers; a conductive substrate, a charge generation layer responsive to actinic radiation to generate an electron hole pair and including a photoconductive material selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium, and a p-type charge transport layer including p-diethylaminobenzaldehyde-(diphenylhydrazone) and a polymeric binder; exposing the electrophotographic element to an image-wise pattern of actinic radiation; and discharging the negative charge in the image-wise pattern corresponding to the pattern of the actinic radiation by combining the hole transported through the charge transport layer and a localized negative charge to produce an electrostatic image at the surface of the electrophotographic element.
Claim 25
Dependent Claim
121 words
An electrophotographic process comprising; negatively charging in the dark the surface of an electrophotographic element comprising in ordered layers; a conductive substrate, a charge generation layer responsive to actinic radiation to generate an electron hole pair and including a photoconductive material selected from the group consisting of Chlorodiane Blue, methyl squarylium and hydroxy squarylium, and a p-type charge transport layer including p-diethylaminobenzaldehyde-(diphenylhydrazone) and a polymeric binder; exposing the electrophotographic element to an image-wise pattern of actinic radiation; and discharging the negative charge in the image-wise pattern corresponding to the pattern of the actinic radiation by combining the hole transported through the charge transport layer and a localized negative charge to produce an electrostatic image at the surface of the electrophotographic element.
References Cited (Backward Citations)
GB930988A
Cited
US3547646A
Cited
US3717462A
Cited
US3697595A
Cited
GB1351129A
Cited
US3870516A
Cited
US3765884A
Cited
US4028102A
Cited
US3971821A
Cited
US3997342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |