EP0049623A2 - Elément de formation d'images, photosensible - Google Patents

Elément de formation d'images, photosensible Download PDF

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Publication number
EP0049623A2
EP0049623A2 EP81304580A EP81304580A EP0049623A2 EP 0049623 A2 EP0049623 A2 EP 0049623A2 EP 81304580 A EP81304580 A EP 81304580A EP 81304580 A EP81304580 A EP 81304580A EP 0049623 A2 EP0049623 A2 EP 0049623A2
Authority
EP
European Patent Office
Prior art keywords
layer
poly
acetal
photoresponsive
charge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81304580A
Other languages
German (de)
English (en)
Other versions
EP0049623A3 (fr
Inventor
Leon A. Teuscher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Xerox Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xerox Corp filed Critical Xerox Corp
Publication of EP0049623A2 publication Critical patent/EP0049623A2/fr
Publication of EP0049623A3 publication Critical patent/EP0049623A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording-members for original recording by exposure, e.g. to light, to heat or to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/14—Inert intermediate or cover layers for charge-receiving layers
    • G03G5/142—Inert intermediate layers

Definitions

  • This invention relates to a photosensitive imaging member comprising a conductive substrate having thereon a photoresponsive layer.
  • a xerographic plate containing a photoconductive insulating layer is imaged by first uniformly electrostatically charging its surface. The plate is then exposed to a pattern of activating electromagnetic radiation, such as light, which selectively dissipates charge in the illuminated areas of the photoconductive insulator resulting in a latent electrostatic image corresponding to the pattern of light-struck and nonlight-struck areas.
  • the latent electrostatic image may then be developed to form a visible image by depositing finely divided electroscopic marking particles on the surface of the photoconductive insulating layer.
  • the photoresponsive region of the plate may be a single photoconductive material, e.g. selenium or this region may be composed of separate layers of a charge generation layer and a charge transport layer.
  • the charge generation layer can be any photoresponsive material This material can be conveniently dispersed in a polymeric matrix material.
  • the charge transport layer may comprise an organic charge transport molecule dissolved or dispersed in a polymeric matrix material.
  • the charge transport layer is substantially nonabsorbing in the spectral region of intended use, i.e. visible light, but is "active" in that it allows (1) injection of photogenerated charge from the charge generation layer and (2) efficient transport of these charges to the surface of the transport layer to discharge the surface charge thereon.
  • the present invention is intended to overcome these problems, and provides a photosensitive imaging member which is characterised in that there is positioned between the conductive substrate and the photoresponsive layer, a layer of an acetal of poly(vinyl alcohol).
  • the imaging member is a flexible member having a conductive substrate, an adhesive interface layer of an acetal of polyvinyl alcohol, a charge generation layer and, contiguous therewith, a charge transport layer.
  • this intertacial composition exhibits outstanding tensile strength, modulus of elasticity, adhesive properties and electrical characteristics which far exceed the properties of prior art interfacial layers.
  • reference character 10 illustrates by a cross- sectional view an improved photoreceptor device of the instant invention.
  • Reference character 11 designates a support member which can be an insulating material, for example, polyethylene terephthalate, which is overcoated with a conductive material 12, such as aluminum.
  • a conductive material 12 such as aluminum.
  • Aluminized polyethylene terephthalate is an effective material which is used in place of a fully metallic substrate.
  • Layer 11 can be any one of a number of insulating or dielectric support materials and 12 can be any number of conductive materials.
  • the substrate can be polyethylene, polypropylene, polycarbonate, ceramic, etc. The advantage of using a material such as polyethylene terephthalate is that it is flexible and extremely strong.
  • the support may comprise other materials such as metallized paper, plastic sheets covered with a thin coating of aluminum or copper iodide or glass coated with a thin conductive layer of chromium or tin oxide. It is preferred to use a dielectric belt coated with aluminum with its inherent coating of aluminum oxide.
  • the conductive layer 12 is overcoated with the interfacial layer 13 which comprises an acetal of polyvinyl alcohol
  • Typical acetals of polyvinyl alcohol include the following: poly(vinyl formal), poly(vinyl acetal) and poly(vinyl butyral).
  • the preferred acetal is poly(vinyl butyral).
  • the molecular weight range of the poly(vinyl butyral) is preferably from about 30,000-270,000.
  • the molecular weight range of the poly(vinyl formal) and poly(vinyl acetal) is preferably from about 10,000 to 40,000.
  • the interface layer can be deposited in a thickness range of about 100 Angstroms to 5000 Angstroms. It is preferred that this thickness be about 500 Angstroms. This material is conveniently coated from alcohol solutions such as isopropanol or mixtures of ethanol and isopropanol, etc.
  • the photoreceptor is a combination of layer 14 and layer 15.
  • the arrangement provides for a layer 14 which is known as a charge generation layer and layer 15 which is known as a charge transport layer.
  • layer 14 can comprise a particulate charge generation material such as amorphous or trigonal selenium or phthalocyanine dispersed in a binder material such as poly-N-vinyl carbazole.
  • layer 15 can be formed of an organic charge transfer compound dissolved in an organic matrix material.
  • a photoreceptor of this type will be found described in U.S. Patent 4,115,116.
  • the interfacial layer may be made by any convenient technique.
  • the selected acetal may be dissolved in a solvent and the solution coated onto the supporting substrate. The solvent is then allowed to evaporate leaving a dried coating on the supporting substrate. Residuals of the solvent are then driven off by drying at an efficient temperature.
  • Typical coating techniques which are suitable for forming the interfacial layer include spray coating, draw coating, dip coating or flow coating.
  • a preferred application of the instant invention includes the use of the instant interface with an aluminized Mylar substrate.
  • the thickness of the Mylar is about 3 mil and the thickness of the aluminum overcoat is 200 Angstroms.
  • On top of this layer of poly(vinyl butyral) is deposited a I micron layer of vitreous selenium by a conventional vacuum deposition technique.
  • a charge transport layer is deposited over the vitreous selenium layer by applying a solution of N,N'- diphenyl-N,N'-bis(3-methylphenyl)-[1,1'-biphenyl]-4,4'-diamine in a bisphenol-A polycarbonate (Lexan o 145) obtained from General Electric Company and having a molecular weight of from about 25,000 to about 40,000 using methylene chloride as a solvent.
  • This layer is applied to the vitreous selenium layer using a Bird film applicator.
  • the coating is then vacuum dried at 40° C for about 18 hours to form a 22 micron thick dry layer of charge transport material.
  • the above member is then heated to about 125° C for about 16 hours which is sufficient to convert the vitreous selenium to the crystalline trigonal form.
  • This device was examined and subjected to conventional Carlson xerography imaging cycles totaling about 20,000 cycles.
  • the residual remained at 40 volts and showed no signs of cycle up which would have indicated a progressive increase in the residual voltage on discharge of the photoreceptor.
  • the overall mechanical integrity of the structure was excellent revealing no evidence of delamination between the conductive layer and the polyvinyl butyral or between the generator layer and the polyvinyl butyral.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
EP81304580A 1980-10-02 1981-10-02 Elément de formation d'images, photosensible Withdrawn EP0049623A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US19324980A 1980-10-02 1980-10-02
US193249 1980-10-02

Publications (2)

Publication Number Publication Date
EP0049623A2 true EP0049623A2 (fr) 1982-04-14
EP0049623A3 EP0049623A3 (fr) 1982-07-21

Family

ID=22712830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81304580A Withdrawn EP0049623A3 (fr) 1980-10-02 1981-10-02 Elément de formation d'images, photosensible

Country Status (3)

Country Link
EP (1) EP0049623A3 (fr)
JP (1) JPS5790639A (fr)
CA (1) CA1174889A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8343699B2 (en) 2009-11-02 2013-01-01 Canon Kabushiki Kaisha Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4489148A (en) * 1983-04-25 1984-12-18 Xerox Corporation Overcoated photoresponsive device
US5130216A (en) * 1988-09-22 1992-07-14 Canon Kabushiki Kaisha Photosensitive member for electrophotography
JP2567086B2 (ja) * 1989-03-15 1996-12-25 キヤノン株式会社 電子写真感光体
JP2567090B2 (ja) * 1989-04-20 1996-12-25 キヤノン株式会社 電子写真感光体
US5419993A (en) * 1991-11-01 1995-05-30 Canon Kabushiki Kaisha Polyamide, electrophotographic photosensitive member employing the polyamide, and electrophotographic apparatus, device unit and facsimile machine employing the member

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2860048A (en) * 1955-06-13 1958-11-11 Haloid Xerox Inc Xerographic plate
US3428451A (en) * 1960-09-19 1969-02-18 Eastman Kodak Co Supports for radiation-sensitive elements and improved elements comprising such supports
AU453265B2 (en) * 1971-02-25 1974-09-11 Xerox Corporation Xerographic electron transport structure
BE788303A (fr) * 1971-09-02 1973-03-01 Xerox Corp Procede d'enregistrement d'une image electro-statique dans un photorecepteur a couches multiples
JPS5028838A (fr) * 1973-07-17 1975-03-24
US4282294A (en) * 1980-10-06 1981-08-04 Honeywell Inc. Polyvinyl blocking layer for preventing charge injection in a thermoplastic photoconductive device for holography

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8343699B2 (en) 2009-11-02 2013-01-01 Canon Kabushiki Kaisha Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

Also Published As

Publication number Publication date
JPS5790639A (en) 1982-06-05
EP0049623A3 (fr) 1982-07-21
CA1174889A (fr) 1984-09-25

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Inventor name: TEUSCHER, LEON, A.