EP0024762A2
Expired / Lapsed
EP
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Electrophotographic process for forming a visible image
Assignee: Canon Production Printing Netherlands BV
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Filing: 1980-08-18
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Granted: —
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Expires: 2000-08-18
Abstract
Abstract Electrophotographic process in which a charge pattern is formed on a photoconductive element comprising a charge generating pigment-binder layer and a smooth charge-conveying top layer and the charge pattern is developed with a one-component developing powder of which the particles have a specific resistance exceeding 10 11 Ohm.m. Preferably the electrophotographic process is performed on a photoconductive element comprising a charge generating pigment-binder layer which is composed of a dispersion of an azo dye in a charge-transfer-complex of a polyvinyl carbazole and a nitrated fluorene derivative.
Inventors
- 👤 Martinus Theodorus Johannes Peters
- 👤 Joannes Adrianus Verbunt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 22:50
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0675; G03G5/0679; G03G5/0683; G03G9/00; G03G9/08; G03G9/0821; G03G9/0823
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A process for forming a visible image in which a photoconductive element with a charge-generating layer, and a smooth charge-conveying top layer is provided with a charge pattern, and the charge pattern is developed with a one-component developing powder of which the particles have a specific resistance exceeding 10 11 0hm.m., characterized in that the image is formed on a photoconductive element of which the charge-generating layer comprises a pigment that generates charges in light,said pigment being dispersed in a charge-conveying binder.
Claim 2
Dependent Claim
82 words
A process for forming a visible image in which a photoconductive element with a charge-generating layer, and a smooth charge-conveying top layer is provided with a charge pattern, and the charge pattern is developed with a one-component developing powder of which the particles have a specific resistance exceeding 10 11 0hm.m., characterized in that the image is formed on a photoconductive element of which the charge-generating layer comprises a pigment that generates charges in light,said pigment being dispersed in a charge-conveying binder.
Claim 3
Dependent Claim
24 words
A process according to claim 1, characterized in that a charge-generating layer containing 10 to 35% by weight of a charge-generating pigment is used.
Claim 4
Dependent Claim
38 words
A process according to claim 1 or 2, characterized in that a charge-generating layer having a thickness between 0.5 and 3µm in which the average diameter of the charge-generating pigment particles ranges from 0.1 to 3µm is used.
Claim 5
Dependent Claim
40 words
A process according to any one of the preceding claims, characterized in that a charge-generating layer containing as charge-generating pigmentan azo dye and as charge-conveying binder a charge-transfer complex of an electron donor and of an electron acceptor, is used.
Claim 6
Dependent Claim
31 words
A process according to claim 4, characterized in that a charge -generating layer containing as charge-conveying binder a charge-transfer complex of a polyvinyl carbazole and a nitrated fluorene derivative, is used.
Claim 7
Dependent Claim
38 words
A process according to claim 5, characterized in that a charge-generating layer containing as charge-conveying binder a charge-transfer complex of a polyvinyl carbazole and a nitrated fluorene derivative in a molar ratio between 3:1 and 10:1, is used.
Claim 8
Dependent Claim
27 words
A process according to any one of the preceding claims characterized in that a charge -generating layer containing as charge-generating pigment a stilbene bisazo dye, is used.
Claim 9
Dependent Claim
26 words
A process according to claim 7, characterized in that a charge-generating layer containing 4,4 -bis (2 -hydroxy -3 - isopropylaminocarbonyl-naphthylazo)-stilbene as a charge-generating pigment, is used.
Claim 10
Dependent Claim
38 words
A process according to claim 8, characterized in that a charge-generating layer containing as charge-generating pigment a mixture of 4,4 -bis(2 -hydroxy-3 - isopropylaminocarbonyl naphthylazo)-stilbene and the polycondensation product of 1,4 -phenylene diacetonitrile with 2,5-dimethoxy terephthalaldehyde, is used.
References Cited (Backward Citations)
No citation records indexed.
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