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EP0000582A2 - Matériau d'enregistrement électrophotographique - Google Patents

Matériau d'enregistrement électrophotographique Download PDF

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Publication number
EP0000582A2
EP0000582A2 EP78100507A EP78100507A EP0000582A2 EP 0000582 A2 EP0000582 A2 EP 0000582A2 EP 78100507 A EP78100507 A EP 78100507A EP 78100507 A EP78100507 A EP 78100507A EP 0000582 A2 EP0000582 A2 EP 0000582A2
Authority
EP
European Patent Office
Prior art keywords
layer
charge
recording material
weight
parts
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.)
Granted
Application number
EP78100507A
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German (de)
English (en)
Other versions
EP0000582A3 (en
EP0000582B1 (fr
Inventor
Wolfgang Dr. Wiedemann
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.)
Hoechst AG
Original Assignee
Hoechst AG
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Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of EP0000582A2 publication Critical patent/EP0000582A2/fr
Publication of EP0000582A3 publication Critical patent/EP0000582A3/xx
Application granted granted Critical
Publication of EP0000582B1 publication Critical patent/EP0000582B1/fr
Expired legal-status Critical Current

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    • 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, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/05—Organic bonding materials; Methods for coating a substrate with a photoconductive layer; Inert supplements for use in photoconductive layers
    • G03G5/0528—Macromolecular bonding materials
    • G03G5/0557—Macromolecular bonding materials obtained otherwise than by reactions only involving carbon-to-carbon unsatured bonds
    • G03G5/0585—Cellulose and derivatives
    • 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, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/10—Bases for charge-receiving or other layers
    • G03G5/102—Bases for charge-receiving or other layers consisting of or comprising metals

Definitions

  • the invention relates to electrophotographic recording material comprising an electrically conductive layer support, optionally an insulating intermediate layer and a photoconductive layer comprising at least one charge carrier-generating and charge-transporting layer, binder and conventional additive-containing layer, in particular a recording material with charge carrier-generating layer and charge transport layer.
  • Multi-layer photoconductive layers are e.g. B. from German Offenlegungsschriften 21 08 935, 21 08 938, 21 08 944, 21 08 958, 21 08 968, 21 08 984 and 21 08 992 known.
  • the mechanical properties are disadvantageous in that the polyvinylcarbazole used and mainly described in the form of a charge transport layer is not very flexible and, because of its large molecular weight and its chemical nature, is only slightly compatible or miscible with binders and resins.
  • the adhesion of such multilayers to the electrically conductive substrate is insufficient for practical purposes. The use of these materials is therefore limited to photoconductor arrangements that are not mechanically resilient.
  • German laid-open publications 22 20 408, .23 14 051 and 23 53 639 describe well-adhering and also flexible photoconductive layers. However, these are also sufficient when used in mechanically stressed, self-supporting recording materials such as, for. B. photoconductor tapes are not yet highest sayings. When the recording material is repeatedly guided over a narrow roller diameter, fine hairline cracks occur on the surface of the photoconductor. This strong bending stress on the photoconductor layer, which can also be on a relatively thick support, causes a gradual mechanical destruction of the photoconductive layer.
  • the described photoconductive layers also have a higher residual charge if conventional binders such as e.g. readily soluble polyester resins or copolymers of vinyl chloride / vinyl acetate etc. are present.
  • conventional binders such as e.g. readily soluble polyester resins or copolymers of vinyl chloride / vinyl acetate etc. are present.
  • an electrophotographic recording material composed of an electrically conductive layer support, optionally an insulating intermediate layer and a photoconductive layer comprising at least one charge carrier which generates and charges Transporting compounds, binders and conventional additives layer and is characterized in that the recording material worked with a 75 to 250 / um thick layer support as a photoconductor tape is so flexible that it repeatedly leads over rolls of at least 12 mm in diameter, not to hairline cracks tends and that it contains a cellulocenitrate as a thickener, which has a viscosity of 400 ⁇ 25 cPoises at concentrations between about 4 and 12 percent in 5% aqueous acetone according to DIN 53 179 (standard type 4 - 12), preferably between about 4 and 9 percent (Standard types 4 - 9).
  • electrophotographic recording material can be made available which, compared to materials with the previously known and customary binders, has significantly improved photosensitivity and an extraordinarily low residual charge, both with continuous exposure and particularly with flash exposure, with great flexibility.
  • the arrangement of a simple photoconductive layer has the advantage of being simpler to produce itself (Fig. 1).
  • the arrangement in separate charge carrier generating layer and charge transport layer has the advantage of the compact arrangement of the particles and the optimal charge carrier generation rate (FIGS. 2-4).
  • Numeral 1 indicates the electrically conductive layer support
  • number 2 shows the charge generation layer
  • number 3 indicates the charge transport layer
  • number 4 indicates the adhesion-improving intermediate layer.
  • Section 5 shows layers which represent a charge generation layer in dispersion.
  • Numeral 6 shows a photoconductive layer of photoconductor as a charge-transporting compound, dye as a charge carrier-producing compound and binder, etc.
  • Aluminum foil preferably also transparent, aluminum-vapor-coated polyester foil or aluminum-clad polyester foil with a thickness of up to 300 ⁇ m is preferably used as the electrically conductive layer support, but any other sufficiently conductive support material can also be used.
  • the layer support can be a flexible endless belt, e.g. B. of nickel or steel, etc., Q of a plate.
  • a substrate is used which, as a band, is largely rigid transversely to the direction of travel and is flexible and dimensionally stable along the direction of travel.
  • one Metal strip which already fulfills these conditions very well at thicknesses of 100-120 ⁇ m, uses in particular aluminum-coated polyester films of sufficient thickness, mainly in the range of 75-250 ⁇ m.
  • straps can be formed with layers as a layer carrier, which are necessary for use in high-speed copying machines.
  • the insulating intermediate layer 4 can consist of organic material or optionally also of a thermally, anodically or chemically produced aluminum oxide intermediate layer, and, in addition to promoting adhesion, has the aim, for example, of arranging the charge carrier injection from the layer carrier into the photoconductive layer in the dark. On the other hand, it does not hinder the flow of charge during the exposure process.
  • Natural or synthetic resin binders can be used for the intermediate layer, such as, for example, polyamide resins, polyvinylphosphonic acid, polyurethanes or polyester resins. Their thickness can be up to 5 ⁇ m, while thicknesses of aluminum oxide layers are mostly in the range of 10 2 - 10 R.
  • Inorganic or organic substances such as those used as charge-generating compounds they are already known for this.
  • This subheading includes dyes or amorphous selenium e.g. B. in the form of vapor deposition layers.
  • the used admixed inorganic substances such. B. plates particularly determine the spectral sensitivity of the photoconductive layer.
  • the application of a homogeneous, densely packed dye layer as a charge carrier generating layer is known and is obtained by evaporating the dye onto the carrier in vacuo.
  • the dyes can be evaporated without decomposition under relatively favorable conditions (10 -3 - 10- 5 Torr, 250 - 400 ° C heating temperature).
  • the temperature of the carrier is below 50 ° C.
  • An advantageous layer thickness range of the evaporated dye is between 0.005 and 2 ⁇ m, but is particularly preferred between 0.005 and 1 / ⁇ m, since adhesive strength and homogeneity of the evaporated dye are particularly favorable here.
  • the production of the charge carrier-producing layer with a uniform thickness can also be achieved by other coating techniques, for example by mechanically rubbing the finely powdered material into the electrically conductive layer carrier, by chemical deposition of a leuco base to be oxidized, by electrolytic or electrochemical processes or also by gun spray technique or by applying from a solution and drying the same.
  • homogeneous, well covering dye layers with thicknesses of the order of 0.1-3 ⁇ m thickness are possible by dispersing the dyes also in a binder according to the invention and by coating the electrically conductive layer support ( Layer 5 in Fig. 4).
  • the use of highly viscous cellulose nitrates is particularly advantageous, because during grinding a very good distribution of the pigments (small grain size) is achieved during the coating.
  • the ratio of charge generating substance to binder can vary within wide limits. Pre-coatings with a dye content of more than 50% and a correspondingly high optical density are preferred. This achieves the use of dyes which are less thermally stable, such as, for example, azo or bisazo dyes, and at the same time have an adhesion-promoting effect.
  • charge transporting compounds are used as photoconductors. These are primarily organic compounds that have an extensive ⁇ electron system. These include both monomeric and polymeric aromatic or heterocyclic compounds.
  • the monomers used are in particular those which have at least one dialkylamino group or two alkoxy groups.
  • Heterocyclic compounds such as oxdiazole derivatives according to DT-AS 10 58 836, such as 2,5-bis- (4'-diethylaminophenyl) -oxdiazole-1,3,4, have proven particularly useful.
  • Suitable monomers are, for example, triphenylamine derivatives, more highly condensed aromatic compounds such as pyrene, benzo-fused heterocycles, and also pyrazoline or imidazole derivatives according to DT-PS 10 60 714 and DT-PS 11 06 599; this subheading also includes triazole, thiadiazole and oxazole derivatives, as are known from German patents 10 60 260, 12 99 296, 11 20 875.
  • Formaldehyde condensation products with various aromatics such as, for example, condensates of formaldehyde and 3-bromopyrene in accordance with DT-OS 21 37 288 have proven themselves as polymers.
  • the charge transport layer has a high electrical resistance and prevents the discharge of electrostatic charge in the dark. When exposed, it transports the generated charges, whereby it is assumed that, according to the invention, the polar (charged) excited state of the donor molecule is reduced and / or the nonpolar ground state is increased due to the increased polarity of the binder (electron-attracting nitro groups in cellulose nitrate).
  • the added binder influences both the mechanical behavior such as abrasion, flexibility, film formation etc. and the electrophotographic properties such as photosensitivity, residual charge etc.
  • previously film-forming compounds such as polyester resins, polyvinyl chloride / polyvinyl acetate copolymers, styrene-maleic anhydride copolymers, silicone resins, Reactive resins, DD lacquers, polycarbonates and acrylates or methacrylates etc. are used.
  • the viscosity is determined in Ubbelohde viscometers with different capillaries I - III at 25 ° C and a solids concentration of 10% (DIN 51 562). The viscosity of the binder batches in tetrahydrofuran is then well above 50 cSt.
  • the mixing ratio of the charge transporting compound to the binder can vary.
  • Films with a high proportion of cellulose nitrates can also only be reduced to a low level on a conductive support. bonds, however, the charge can be gradually improved and stabilized with increasing content, ie the dark discharge is reduced.
  • the cellulose nitrate proportions are in the lower range indicated.
  • the transport layers with monomers from charge-transporting compounds are amorphous according to X-ray goniometer measurements.
  • the respective requirements of the recording material according to the invention for use in a copying machine can be adjusted by varying the viscosity of the photoconductive layer of the cellulose nitrate and in terms of the proportion of the charge-transporting compound are met within a wide range.
  • the layer thickness of the photoconductive layer is in a range which corresponds to a layer weight of approximately 5 to 50 g / m.
  • layer thicknesses in the range from 0.005 to 2 ⁇ m, preferably 0.005 to ⁇ m or in the range from 2 to 20 ⁇ m, preferably 3 to 10 ⁇ m, are suitable.
  • layer thicknesses in the range from 0.01 to 3 ⁇ m, preferably 0.1 to 1 ⁇ m, are suitable.
  • the specified limits can be extended upwards or downwards in individual cases.
  • Leveling agents such as silicone oils, wetting agents, in particular non-ionic substances, plasticizers of different compositions, such as, for example, based on chlorinated hydrocarbons or based on phthalic acid esters, are considered to be “ customary ” additives according to the invention.
  • sensitizers and / or acceptors can also be added to the charge transport layer, however only to the extent that the optical In the following table, they are compared with known, highly sensitive organic photoconductor layers in their photosensitivity, the comparable photoconductor double layer arrangement having an approximately 150 mg / m 2 thick coating of dye.
  • a series of transport layers with differently viscous cellulose nitrates is applied to aluminum-vapor-coated polyester of 75 ⁇ m thickness with a dye layer evaporated thereon as indicated in Example 1, under comparable conditions in 8-10 ⁇ m thickness.
  • the composition of the dried layers is a uniform 60 parts TO and 40 parts of the respective cellulose nitrate, which differs in its degree of viscosity and extends over a standard type range from 15 to 4 according to DIN 53 179.
  • a dye layer is applied to polyester film 75, 125 and 190 ⁇ m thick, made conductive by a vapor-deposited aluminum layer.
  • a charge transport layer consisting of 65 parts by weight TO and 35 parts by weight of highly viscous cellulose nitrate is applied uniformly by coating and drying in a layer thickness range of 7.0 - 9.5 g / m2 under the same conditions.
  • the material is either glued or welded into a loop and subjected to a bending stress test.
  • the flexible loop is often guided over roller diameters of different thicknesses. It is run over a drive rubber roller of approx. 80 mm ⁇ as well as a replaceable steel roller with a diameter of 12, 18 or 25 mm as standard 5000 times, with a constant speed of rotation.
  • the photoconductor layer is exposed to an increased bending stress, so that hairline cracks can occur on the surface under this stress. This formation of hair cracks is advantageously observed in the dark under oblique angles.
  • a charge transport layer composition comprising 50 parts by weight of TO, 25 parts by weight of polyester resin and 25 parts by weight of vinyl chloride / vinyl acetate copolymer is applied in a layer thickness of 9-10 g / m 2 to a dye layer according to Example 1 and subjected to the bending stress test. After that, no, on the micron with 125 thickness isolated short hair cracks and on the 190 / um thick polyester film very strong and long hair cracks do occur at 25 mm roller diameter and 5000 rounds in the photoconductive layer on polyester film of 75 microns thickness. In addition, occasional hairline cracks occur with a roller diameter of 18 mm and a carrier thickness of 75 ⁇ m.
  • Example 1 As indicated in Example 1, the following dyes and selenium are applied to aluminum-vapor-coated polyester film 75 ⁇ m thick in a layer thickness range of 100-200 mg / m 2 .
  • Coating and drying (except for the selenium layer, which was dried for 3 minutes at 85 ° C) is carried out under comparable conditions (see Example 1), the thickness of the charge transport layer is 8-10 ⁇ m, the TO / binder weight ratio is 1: 1.
  • Example 1 The measurement conditions of Example 1 also apply, the light intensity (xenon XBO 150) of one series of measurements being approximately 150 ⁇ W / cm 2 , another 80-85 ⁇ W / cm 2 and a charging range of 600-700 V being aimed for.
  • the residual charge is determined as an additional criterion for the photosensitivity, which is established after 0.1 seconds.
  • a according to DT-OS 21 37 288 condensation product prepared from 3-bromopyrene and formaldehyde has proved g as a polymeric charge transport compound ut.
  • the sensitivity can be significantly improved compared to known binders such as polyester resin.
  • a charge transport layer composed of 80 parts by weight of bromopyrene resin and 20 parts by weight of low-viscosity cellulose nitrate in a thickness of 6-7 ⁇ m is applied to a material coated in accordance with Example 1.
  • an analog material with a charge transport layer is produced from 80 parts by weight of bromopyrene resin and 20 parts by weight of polyester resin in a thickness of 6-7 ⁇ m.
  • the sensitivity measurement gives the following values:
  • the dark decay of a photoconductor sample is measured in a Dyntest-90 device (paper analyzer) from ECE, G corden.
  • a measuring probe registers the charge (U) or the voltage drop ( ⁇ U D ), which is recorded by a recorder. The voltage drop in the dark after 2 seconds is in the one of interest measured:
  • the discharge behavior during flash exposure is determined by mounting the sample on an aluminum plate, charging it and introducing it into the measuring station.
  • the photoconductor layer is exposed through a transparent charge probe using a xenon short-arc lamp (Strobotac 1538-A flash lamp, General Radio).
  • the charges measured with the charge probe are amplified and registered with a recorder.
  • Wavelength and light energy can be varied using interference and gray filters that can be inserted into the beam path. If the energy of the flash unit is constant, the light energy is determined directly after removing the photoconductor sample from the beam path (UDT-80 X optometer, see also Example 1).
  • the sample After reaching a constant charge (field strength range 10 - 10.7 the sample is exposed to a defined flash energy (constant flash duration 3 / us) and the remaining charge is determined after 1 second.
  • the residual charge U ( V ) is drawn as a function of the flash light energy E ( ⁇ J / cm 2 ) in Fig. 6 (curve 1).
  • the half-value energy (E 1/2 ) at which the photoconductor layer has discharged up to half the initial charge can be determined from these curves.
  • Tetrahydrofuran solutions with different TO contents in high-viscosity cellulose nitrate are flung onto a material coated with a dye as described in Example 1.
  • the resulting layer thicknesses correspond to about 7 - 8 g / m 2 .
  • the measurement is carried out analogously to the measurement method given in Example 1 (light intensity approx. 90 ⁇ W / cm 2 , Xenon XBO 150):
  • this pigment precoat corresponds to 255 mg / m 2 and 50 mg / m, the composition pigment / cellulose nitrate 60/40.
  • a charge transport layer composed of 65 parts by weight of TO and 35 parts by weight of highly viscous cellulose nitrate is applied and dried uniformly to the differently thick pigment precursors with a layer weight of approximately 8 g / m2.
  • the sensitivity is determined analogously to Example 1 (light intensity approx. 85 ⁇ W / cm 2 ; Xenon XBO 150).
  • a pigment precoat from 2 parts by weight of a polynuclear quinone (Hostapermscharlach GO) and one part by weight-phlegmatized high viscosity cellulose nitrate is prepared analogously to Example 1 dispersed 0 and pre-coated on an appropriate carrier in a different layer thickness.
  • a layer corresponding to a layer weight of approximately 7 g / m 2 and a composition of 70 parts by weight TO and 30 parts by weight of low-viscosity cellulose nitrate is layered thereon.
  • the layer weight of the homogeneous, Lat dye layer is 195 mg / m 2 .
  • a layer made for comparison with a vinyl chloride / vinyl acetate copolymer (PVC / PVAc) provides a relatively insensitive system on the same dye vapor deposition layer.
  • the photosensitivity is measured analogously to Example 1 (light intensity: 90 uW / cm 2

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photoreceptors In Electrophotography (AREA)
EP78100507A 1977-07-29 1978-07-26 Matériau d'enregistrement électrophotographique Expired EP0000582B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2734288 1977-07-29
DE2734288A DE2734288C2 (de) 1977-07-29 1977-07-29 Elektrophotographisches Aufzeichnungsmaterial

Publications (3)

Publication Number Publication Date
EP0000582A2 true EP0000582A2 (fr) 1979-02-07
EP0000582A3 EP0000582A3 (en) 1979-02-21
EP0000582B1 EP0000582B1 (fr) 1981-06-17

Family

ID=6015172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100507A Expired EP0000582B1 (fr) 1977-07-29 1978-07-26 Matériau d'enregistrement électrophotographique

Country Status (5)

Country Link
US (1) US4220697A (fr)
EP (1) EP0000582B1 (fr)
JP (1) JPS5426741A (fr)
AU (1) AU516489B2 (fr)
DE (2) DE2734288C2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5660443A (en) * 1979-10-23 1981-05-25 Copyer Co Ltd Lamination type electrophotographic receptor
JPS57152790U (fr) * 1981-03-20 1982-09-25
DE3121563A1 (de) * 1981-05-30 1983-02-03 Hoechst Ag, 6000 Frankfurt Elektrophtographisches aufzeichnungsmaterial und verfahren zu seiner herstellung
JPS58152247A (ja) * 1982-03-05 1983-09-09 Mita Ind Co Ltd 電子写真用有機感光体
JPS61173486A (ja) * 1985-01-25 1986-08-05 三京冷暖株式会社 電気カ−ペツト等における発熱体の製法
DE3537979A1 (de) * 1985-10-25 1987-04-30 Hoechst Ag Elektrophotographisches aufzeichnungsmaterial
US5283144A (en) * 1992-09-02 1994-02-01 Xerox Corporation Purified photogenerating pigments
DE69524044T2 (de) * 1994-12-22 2002-07-04 Ciba Speciality Chemicals Holding Inc., Basel Elektrophotographischer Photorezeptor
US5965670A (en) * 1997-12-24 1999-10-12 Ppg Industries Ohio, Inc. Curable-film forming compositions having improved mar and acid etch resistance
US6493063B1 (en) * 1999-06-24 2002-12-10 Advanced Micro Devices, Inc. Critical dimension control improvement method for step and scan photolithography

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB944941A (fr) * 1958-11-17 1900-01-01
US3152895A (en) * 1962-03-14 1964-10-13 T F Washburn Company Coating composition for the production of electrophotographic recording members
DE1622959A1 (de) * 1961-05-01 1971-01-14 Rank Xerox Ltd Elektrofotografische Anordnung mit einer fotoleitenden Schicht
US3652268A (en) * 1970-03-16 1972-03-28 Dick Co Ab Barrier coated electrophotographic sheet suitable for liquid development
DE2149712A1 (de) * 1970-10-05 1972-04-20 Fuji Photo Film Co Ltd Elektrophotographisches Verfahren
DE2220408A1 (de) * 1972-04-26 1973-11-15 Kalle Ag Elektrophotographisches aufzeichungsmaterial und verfahren zu seiner herstellung
CH564797A5 (en) * 1971-11-16 1975-07-31 Gen Co Ltd Electrostatic recording carrier - for writing or printing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121006A (en) * 1957-06-26 1964-02-11 Xerox Corp Photo-active member for xerography
US3447957A (en) * 1964-08-19 1969-06-03 Xerox Corp Method of making a smooth surfaced adhesive binder xerographic plate
JPS4856434A (fr) * 1971-11-16 1973-08-08
DE2242595C2 (de) * 1972-08-30 1982-06-09 Hoechst Ag, 6000 Frankfurt Elektrophotographisches Aufzeichnungsmaterial

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB944941A (fr) * 1958-11-17 1900-01-01
DE1622959A1 (de) * 1961-05-01 1971-01-14 Rank Xerox Ltd Elektrofotografische Anordnung mit einer fotoleitenden Schicht
US3152895A (en) * 1962-03-14 1964-10-13 T F Washburn Company Coating composition for the production of electrophotographic recording members
US3652268A (en) * 1970-03-16 1972-03-28 Dick Co Ab Barrier coated electrophotographic sheet suitable for liquid development
DE2149712A1 (de) * 1970-10-05 1972-04-20 Fuji Photo Film Co Ltd Elektrophotographisches Verfahren
CH564797A5 (en) * 1971-11-16 1975-07-31 Gen Co Ltd Electrostatic recording carrier - for writing or printing
DE2220408A1 (de) * 1972-04-26 1973-11-15 Kalle Ag Elektrophotographisches aufzeichungsmaterial und verfahren zu seiner herstellung

Also Published As

Publication number Publication date
JPH0139096B2 (fr) 1989-08-18
EP0000582A3 (en) 1979-02-21
DE2734288A1 (de) 1979-02-01
AU3772478A (en) 1980-01-10
JPS5426741A (en) 1979-02-28
DE2860772D1 (en) 1981-09-24
EP0000582B1 (fr) 1981-06-17
US4220697A (en) 1980-09-02
AU516489B2 (en) 1981-06-04
DE2734288C2 (de) 1982-06-03

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