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US4426434A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrophotographic photoreceptor and preparation thereof

Assignee: NTT Inc
•
Filing: 1982-06-14
•
Granted: 1984-01-17
•
Expires: 2002-06-14
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Abstract

Abstract An electrophotographic photoreceptor comprises an electrically conductive substrate, a layer of charge generating material which chloroaluminium phthalocyanine and chloroaluminium monochlorophthalocyanine are evaporated in a vacuum over the electrically conductive substrate and the evaporated film of chloroaluminium phthalocyanine and chloroaluminium monochlorophthalocyanine are treated by an organic solvent selected from the group consisting tetrohydrofurane, methanol, acetone, methyl ethyl ketone, α-chloronaphthalene, pyridine, a layer of charge transport material overcoated the layer of charge generating material. The electrophotographic photoreceptor and the preparation thereof is disclosed to apply for use in a laser printing machine in which a light of laser diode or light emission diode is used as a light source. The solvent treated layer of evaporated film of chloroaluminium phthalocyanine and chloroaluminium monochlorophthalocyanine are observed to have a high photosensitivity in near infrared region, especially over 750 nM of wavelength regions.

Inventors

  • 👤 Koichi Arishima
  • 👤 Takeshi Okada
  • 👤 Akiyuki Tate
  • 👤 Hiroaki Hiratsuka

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 08:25
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0696; Y; Y10; Y10S; Y10S430/00; Y10S430/146

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 71 words
A method of preparation of an electrophotographic photoreceptor for use in laser printing machines comprising: evaporating over an electrically conductive substrate under vacuum from about 10 to about 10 -4 Pa on a film selected from the group consisting of chloroaluminium phthalocyanine, and chloroaluminium monochlorophthalocyanine: treating said film with an organic solvent constituting a good solvent for said film; and overcoating said treated film with a layer of charge transport material.
Claim 2
Independent Claim 71 words
A method of preparation of an electrophotographic photoreceptor for use in laser printing machines comprising: evaporating over an electrically conductive substrate under vacuum from about 10 to about 10 -4 Pa on a film selected from the group consisting of chloroaluminium phthalocyanine, and chloroaluminium monochlorophthalocyanine: treating said film with an organic solvent constituting a good solvent for said film; and overcoating said treated film with a layer of charge transport material.
Claim 3
Dependent Claim 19 words
A method of preparation of a photoreceptor in accordance with claim 1 wherein the electrically conductive substrate is aluminum.
Claim 4
Dependent Claim 31 words
A method of preparation of photoreceptor in accordance with claim 1 wherein the organic solvent is selected from the group consisting of tetrahydrofuran, methanol, acetone, methyl ethyl ketone, α-chloronaphthalene and, pyridine.
Claim 5
Dependent Claim 50 words
A method of preparation of a photoreceptor in accordance with claim 1 wherein the treatment with said organic solvent takes place by contacting said film with tetrahydrofuran vapor at a temperature ranging from 10° C. to 40° C. during a period of time ranging from 30 minutes to three hours.
Claim 6
Dependent Claim 33 words
A method of preparation of a photoreceptor in accordance with claim 1 wherein the treatment of a organic solvent takes place by dipping said film in tetrahydrofuran at room temperature for one second.
Claim 7
Dependent Claim 30 words
A method of a preparation of photoreceptor in accordance with claim 1 wherein the layer of charge transport material comprises an insulating organic synthetic resin and a charge transport material.
Claim 8
Dependent Claim 44 words
A method of preparation of a photoreceptor in accordance with claim 1 wherein the layer of charge transport material comprises p-diethy amino benzilidend hydrazone of 10 parts by weight, poly methyl methacrylate of 10 parts by weight and chloroform of 80 parts by weight.

References Cited (Backward Citations)

US3238149A Cited
US4214907A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1987-01-16 1987-07-18 1988-01-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1991-01-16 1991-07-18 1992-01-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1995-01-16 1995-07-18 1996-01-17 $7700.00 Window Closed / Lapsed

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