US3879200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel xerographic plate containing photoinjecting bis-benzimidazole pigments
Assignee: Xerox Corp
•
Filing: 1973-04-05
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Granted: 1975-04-22
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Expires: 1993-04-05
Abstract
Abstract An electrophotographic plate having a photoreceptor comprising a photoinjecting pigment selected from the class of bisbenzimidazole pigments and an active transport material which is substantially transparent in the wavelength region of xerographic use and capable of supporting charge carrier injection from the pigment. The photoinjecting bis-benzimidazole pigments have the property of being efficient both in photogeneration of charge carriers and subsequent injection of the charge carriers into hole and electron transport active transport materials. The photoinjecting pigment and active transport material system may be used in a binder or layer type photoreceptor. The structure may be imaged in the conventional xerographic mode which usually includes charging, exposure to light, and development.
Inventors
- 👤 Paul J Regensburger
- 👤 James J Jakubowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:48
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/043; G03G5/047; G03G5/06; G03G5/0622; G03G5/0644; G03G5/0646; G03G5/0659
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
97 words
AN ELECTROPHOTOGRAPHIC PLATE HAVING A PHOTORECEPTOR MEMBER OF FROM ABOUT 2 TO 100 MICRONS COMPRISING A PHOTOCONDUCTIVE MATERIAL AND AN ACTIVE TRANSPORT MATERIAL BOTH OF WHICH ARE COMPATIBLE SO AS TO SUPPORT EFFICIENT PHOTOGENERATED CHARGE INJECTION FROM THE PHOTOCONDUCTIVE MATERIAL, SAID PHOTOCONDUCTIVE MATERIAL BEING A PHOTOINJECTING PIGMENT BEING SELECTED FROM THE CLASS OF BIS-BENZIMIDAZOLE PIGMENTS IN AN AMOUNT BETWEEN ABOUT 0.1 AND 5 PERCENT BY VOLUME OF THE ACTIVE TRANSPORT LAYER AND SAID ACTIVE TRANSPORT MATERIAL BEING A CHARGE TRANSPORT MEDIUM WHICH IS SUBSTANTIALLY NONABSORBING IN THE WAVELENGTH REGION OF FROM ABOUT 4,000 TO 6,500 ANGSTROM UNITS.
Claim 2
Dependent Claim
97 words
AN ELECTROPHOTOGRAPHIC PLATE HAVING A PHOTORECEPTOR MEMBER OF FROM ABOUT 2 TO 100 MICRONS COMPRISING A PHOTOCONDUCTIVE MATERIAL AND AN ACTIVE TRANSPORT MATERIAL BOTH OF WHICH ARE COMPATIBLE SO AS TO SUPPORT EFFICIENT PHOTOGENERATED CHARGE INJECTION FROM THE PHOTOCONDUCTIVE MATERIAL, SAID PHOTOCONDUCTIVE MATERIAL BEING A PHOTOINJECTING PIGMENT BEING SELECTED FROM THE CLASS OF BIS-BENZIMIDAZOLE PIGMENTS IN AN AMOUNT BETWEEN ABOUT 0.1 AND 5 PERCENT BY VOLUME OF THE ACTIVE TRANSPORT LAYER AND SAID ACTIVE TRANSPORT MATERIAL BEING A CHARGE TRANSPORT MEDIUM WHICH IS SUBSTANTIALLY NONABSORBING IN THE WAVELENGTH REGION OF FROM ABOUT 4,000 TO 6,500 ANGSTROM UNITS.
Claim 3
Dependent Claim
97 words
An electrophotographic plate having a photoreceptor member of from about 2 to 100 microns comprising a photoconductive material and an active transport material both of which are compatible so as to support efficient photogenerated charge injection from the photoconductive material, said photoconductive material being a photoinjecting pigment being selected from the class of bis-benzimidazole pigments in an amount between about 0.1 and 5 percent by volume of the active transport layer and said active transport material being a charge transport medium which is substantially nonabsorbing in the wavelength region of from about 4,000 to 6,500 Angstrom Units.
Claim 4
Dependent Claim
97 words
An electrophotographic plate having a photoreceptor member of from about 2 to 100 microns comprising a photoconductive material and an active transport material both of which are compatible so as to support efficient photogenerated charge injection from the photoconductive material, said photoconductive material being a photoinjecting pigment being selected from the class of bis-benzimidazole pigments in an amount between about 0.1 and 5 percent by volume of the active transport layer and said active transport material being a charge transport medium which is substantially nonabsorbing in the wavelength region of from about 4,000 to 6,500 Angstrom Units.
Claim 5
Dependent Claim
22 words
the electrophotographic plate of claim 1 in which the photoreceptor member comprises a bis-benzimidazole pigment dispersed in an active binder transport material.
Claim 6
Dependent Claim
78 words
The electrophotographic plate of claim 1 in which the photoreceptor member is a layered configuration comprising a bis-benzimidazole pigment single layer in contact with an active transport material overlayer, and wherein said active transport layer has a thickness of from about 5 to 100 microns, said photoconductor layer has a thickness of from 0.05 to 20 microns and the ratio of the thickness of the active transport layer to the photoconductor layer is from about 2:1 to 200:1.
Claim 7
Dependent Claim
105 words
An electrophotographic plate having a photoreceptor member of from about 2 to 100 microns comprising a photoconductive material and an active transport material both of which are compatible so as to support efficient photogenerated charge injection, said photoconductive material being a photoinjecting pigment being selected from the class of bis-benzimidazole pigments prepared by the reaction of 1,4,5,8-naphthalene tetracarboxylic acid with arylene and heterocyclic diamines in an amount between about 0.1 and 5 percent by volume of the active transport layer and said active transport material being a charge transport medium which is substantially non-absorbing in the wavelength region of from about 4,000 to 6,500 Angstroms.
Claim 8
Dependent Claim
105 words
An electrophotographic plate having a photoreceptor member of from about 2 to 100 microns comprising a photoconductive material and an active transport material both of which are compatible so as to support efficient photogenerated charge injection, said photoconductive material being a photoinjecting pigment being selected from the class of bis-benzimidazole pigments prepared by the reaction of 1,4,5,8-naphthalene tetracarboxylic acid with arylene and heterocyclic diamines in an amount between about 0.1 and 5 percent by volume of the active transport layer and said active transport material being a charge transport medium which is substantially non-absorbing in the wavelength region of from about 4,000 to 6,500 Angstroms.
Claim 9
Dependent Claim
23 words
The electrophotographic plate of claim 4 in which the bis-benzimidazole is the trans isomeric reaction product of 1,4,5,8-naphthalene tetracarbonxylic acid with 0-phenylene diamine.
Claim 10
Dependent Claim
23 words
The electrophotographic plate of claim 4 in which the bis-benzimidazole is the cis isomeric reaction product of 1,4,5,8-naphthalene tetracarboxylic acid with 0-phenylene diamine.
Claim 11
Dependent Claim
22 words
The electrophotographic plate of claim 4 in which the photoreceptor member comprises the bis-benzimidazole pigment dispersed in an active transport binder material.
Claim 12
Dependent Claim
82 words
The electrophotographic plate of claim 4 in which the photoreceptor member is a layered configuration comprising a bis-benzimidazole pigment single layer and an active transport overlayer in contact with said pigment layer, wherein the bis-benzimidazole pigment layer has a thickness of from about 0.05 to 20 microns and the active transport overlayer has a thickness of from about 5 to 100 microns, and wherein the ratio of the active transport material layer to the photoconductive layer is from about 2:1 to 200:1.
Claim 13
Dependent Claim
58 words
The elctrophotographic plate of claim 4 in which the active transport material is selected from the group of hole transport materials consisting of carbaZole, N-ethyl carbazole, N-phenylcarbazole, tetraphenylpyrene, 1-methylpyrene, perylene, chrysene, fluorene, fluorenone, anthracene, tetracene, tetraphene, 1-phenyl-naphthalene, azapyrene, 1-ethylpyrene, acetyl pyrene, 2,3-benzochrysene, 3,4-benzopyrene, 1,4-bromopyrene and phenyl indole, polyvinyl carbazole, polyvinyl pyrene, polyvinyl tetracene, polyvinyl perylene, and polyvinyl tetraphene.
Claim 14
Dependent Claim
37 words
The electrophotographic plate of claim 4 in which the active transport material is selected from the group of electron transport substances consisting of 2,4,7-trinitro-9-fluorenone, 2,4,5,7-tetranitrofluorenone, dinitroanthracene, dinitroacridene, tetracyanopyrene, dinitroanthraquinone, and polymeric materials containing said electron transport substance.
Claim 15
Independent Claim
125 words
A method of imaging which comprises: a. providing an electrophotographic plate having a photoreceptor member of from about 2 to 100 microns comprising a photoconductive material and an active transport material, said photoconductive material being a photoinjecting pigment being selected from the class of bis-benzimidazole pigments in an amount between about 0.1 and 5 percent by volume of the active transport layer, and said active transport material being a charge transport medium which is substantially nonabsorbing in the wavelength region of from about 4,000 to 6,500 Angstroms, b. uniformly charging said plate, and c. exposing said plate to a source of radiation in the wavelength region of from about 4,000 to 6,500 Angstroms whereby an electrostatic image is formed on the surface of said plate.
Claim 16
Independent Claim
125 words
A method of imaging which comprises: a. providing an electrophotographic plate having a photoreceptor member of from about 2 to 100 microns comprising a photoconductive material and an active transport material, said photoconductive material being a photoinjecting pigment being selected from the class of bis-benzimidazole pigments in an amount between about 0.1 and 5 percent by volume of the active transport layer, and said active transport material being a charge transport medium which is substantially nonabsorbing in the wavelength region of from about 4,000 to 6,500 Angstroms, b. uniformly charging said plate, and c. exposing said plate to a source of radiation in the wavelength region of from about 4,000 to 6,500 Angstroms whereby an electrostatic image is formed on the surface of said plate.
Claim 17
Dependent Claim
16 words
The method of claim 9 which further includes developing said latent image to make it visible.
Claim 18
Dependent Claim
20 words
The method of claim 9 in which the substrate is substantially transparent and exposure is carried out through said substrate.
Claim 19
Dependent Claim
12 words
The plate of claim 1 wherein the transport material is polyvinyl carbazole.
Claim 20
Dependent Claim
12 words
The plate of claim 3 wherein the transport material is polyvinyl carbazole.
Claim 21
Dependent Claim
12 words
The method of claim 11 wherein the transport material is polyvinyl carbazole.
Claim 22
Dependent Claim
22 words
The plate of claim 1 wherein the transport material is polyvinyl carbazole and the pigment is the cis form of bis-benzimidazodiaza pyrenedione.
Claim 23
Dependent Claim
22 words
The plate of claim 1 wherein the transport material is polyvinyl carbazole and the pigment is the trans form of bis-benzimidazodiaza pyrenedione.
Claim 24
Dependent Claim
22 words
The plate of claim 3 wherein the transport material is polyvinyl carbazole and the pigment is the cis form of bis-benzimidazodiaza pyrenedione.
Claim 25
Dependent Claim
22 words
The plate of claim 3 wherein the transport material is polyvinyl carbazole and the pigment is the trans form of bis-benzimidazodiaza pyrenedione.
Claim 26
Dependent Claim
22 words
The method of claim 11 wherein the transport material is polyvinyl carbazole and the pigment is the cis form of bis-benzimidazodiaza pyrenedione.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |