EP0040128B1 - Procédé de reproduction électrographique sur un support quelconque à l'aide d'une poudre de développement magnétique monocomposant - Google Patents

Procédé de reproduction électrographique sur un support quelconque à l'aide d'une poudre de développement magnétique monocomposant Download PDF

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Publication number
EP0040128B1
EP0040128B1 EP81400672A EP81400672A EP0040128B1 EP 0040128 B1 EP0040128 B1 EP 0040128B1 EP 81400672 A EP81400672 A EP 81400672A EP 81400672 A EP81400672 A EP 81400672A EP 0040128 B1 EP0040128 B1 EP 0040128B1
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EP
European Patent Office
Prior art keywords
image
base
powder
dielectric liquid
process according
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.)
Expired
Application number
EP81400672A
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German (de)
English (en)
French (fr)
Other versions
EP0040128A3 (en
EP0040128A2 (fr
Inventor
Donald Kings
Jean-Claude Marckmann
Quang Pham Kim
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.)
Rhone Poulenc Systemes SA
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Rhone Poulenc Systemes SA
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Publication date
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Priority to AT81400672T priority Critical patent/ATE15558T1/de
Publication of EP0040128A2 publication Critical patent/EP0040128A2/fr
Publication of EP0040128A3 publication Critical patent/EP0040128A3/fr
Application granted granted Critical
Publication of EP0040128B1 publication Critical patent/EP0040128B1/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
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/14—Transferring a pattern to a second base
    • G03G13/16—Transferring a pattern to a second base of a toner pattern, e.g. a powder pattern

Definitions

  • the present invention relates to a method of electrographic reproduction on any support using a single-component magnetic developing powder with a volume resistivity less than or equal to 1015 n cm 2 / cm and a device for implementing said method. It relates more particularly to a method of electrographic reproduction in which an image of electrostatic charges formed on a temporary support, such as a photoconductor or any other surface capable of retaining an image of electrostatic charges, is developed using a single-component magnetic development powder with a volume resistivity less than or equal to 10 15 ⁇ cm 2 / cm to form a powder image which is transferred under the action of electrical means (electric field, corona discharge device, etc.) on any image support. It also relates more particularly to a device for implementing said method.
  • corona a corona discharge device
  • a uniform charge of a photoconductor is generally carried out using a corona discharge device (hereinafter called "corona" device) by selective exposure from an original, a image of fillers which is then developed using a developing powder.
  • Ansi patent FR 70/30 396 describes a process for transferring a developed electrophotographic image using a developing powder usually two-component on a metal plate in the presence of a dielectric liquid. According to this process, a potential difference is applied between the support carrying the powder image and the lithographic plate, they are brought into contact over their entire surface, the lithographic plate being previously coated with a layer of dielectric liquid, the support and the lithographic plate and the dielectric liquid is evaporated. The presence of the layer of dielectric liquid prevents any deterioration of the support carrying the image of powder due to the particles of the developing powder, during the transfer.
  • a magnetic brush composed of a metal cylinder in which magnets are rotated, coated with a layer of single-component magnetic development powder.
  • These powders generally have a more or less conductive nature and are charged by induction when approaching the image of charges to be developed, the development being able to be facilitated by the presence of an external electric field.
  • the one-component magnetic development powders have the advantage of not polluting the machine in which they are used, since they are kept permanently on the magnetic brush. These powders are currently widely used in so-called "direct" processes, that is to say for the development of zinc oxide photoconductive papers with which they are entirely satisfactory. However, this direct process is only used on machines with a small print run, since it is more economical to use ordinary paper machines when a large number of print runs are to be carried out, that is to say generally at -from 3000 to 5000 copies per month. In addition, a copy on ordinary media is generally more appreciated by users.
  • the present invention provides a solution to this problem and makes it possible to avoid the drawbacks associated with the use of one-component developing powder.
  • An electrophotographic reproduction method has now been found in which an image of charges is produced on a temporary support, said image then being developed using a single-component magnetic developing powder with a volume resistivity less than or equal to 10 15 ⁇ cm 2 / cm, to form a powder image which is transferred to an image medium under the action of electrical means, characterized in that the image medium is coated before the transfer of the powder image a thin layer of a volatile dielectric liquid with a volume resistivity greater than 10 3 ⁇ cm 2 / cm, with a volatility index of between 0.01 and 0.4, in an amount of between 0.1 and 16 g / m 2 , said liquid remaining present on the image support for at least the time necessary for the transfer of the powder image on said image support, said dielectric liquid having a low solvent power with respect to the powder resins monocom magnetic development laying and / or the photoconductive surface of the temporary support.
  • the temporary support and the image support being in contact along a straight line, it comprises means for coating the image support with a volatile dielectric liquid with a volume resistivity greater than 10 3 S2 cm 2 / cm, with an index of volatility between 0.01 and 0.4 in an amount between 0.1 and 16 g / m 2 , said coating means being in contact with the image medium upstream from the contact line of the temporary medium and of the image carrier with respect to the direction of movement of the image carrier.
  • a liquid with a volume resistivity greater than 10 7 ⁇ cm 2 / cm will be used and even better results are obtained when it is greater than 10 10 ⁇ cm 2 / cm. However, it is around 10 15 ⁇ cm2 / cm of volume resistivity that the best results are observed.
  • Such a method makes it possible, surprisingly, to obtain images of clearly improved quality compared to those obtained, all other things being equal, in the absence of dielectric liquid.
  • a method makes it possible to use any support and even very conductive as a metal as will be seen later, while obtaining an image of excellent quality, having a good density and excellent sharpness (no phenomenon explosion).
  • the Applicant thinks, without wishing to be bound by a theory, that the particles of relatively conductive developing powder, when they are transferred into an electric field on a surface of dielectric nature cannot instantly exchange their induced charge when they come into contact with the receiver. As a result, they remain attracted to this surface, which increases the amount of developer powder transferred.
  • the particles of developing powder are themselves wetted by the dielectric liquid, which contributes to limiting the exchange of charges between them and the copy medium: the parasitic discharges which generate the explosion of the image are deleted.
  • the charge carried by the particle can be canceled: the particle is no longer retained, it is pushed out of the image area or towards the photoconductor , which generates the deteriorations noted above.
  • one-component relatively conductive developing powder means an electrographic image developing powder in which only one type of particle is present and having a volume resistivity less than or at most equal to 1015 n cm 2 / cm. Indeed, beyond this value, there is no longer any notable improvement in the quality of the image transferred in the presence of the volatile dielectric liquid.
  • the invention also extends to mixtures of powders as defined above, of various resistivity and particle size.
  • the improvement of the transferred image is entirely satisfactory for a resistivity between 10 7 and 10 15 ⁇ cm 2 / cm.
  • development powders having a resistivity of between 10 8 and 10 13 ⁇ cm 2 / cm will be used.
  • the resistivity of the developing powder is measured in a cylindrical cell of section 0.07 cm 2 on a 2 mm thick sample under a pressure of 750 g / cm 2 and under a continuous electric field of 1000 V / cm.
  • the image support according to the present invention can be any, that is to say having a surface resistivity less than 10 13 fl cm 2 / cm.
  • Low resistivity supports such as metal supports are also suitable in the context of the present invention.
  • different products can be produced by applying the method according to the invention.
  • hydrophilic supports treated polyester, metal, coated paper, etc.
  • lithographic printing plates are produced directly using ink-absorbing toners.
  • projectable »transparencies « or negatives can be produced directly.
  • Dielectric liquids with volume resistivity as defined above must not be too volatile so that they are always present on the copy medium at the time of the transfer of the powder image, but also sufficiently volatile to evaporate enough quickly so that the copy comes out dry from the machine.
  • a liquid having a volatility index of between 0.01 and 0.4 will be used.
  • liquid volatility index is meant the quotient of the evaporation time on n-butyl acetate filter papers by the evaporation time of the selected dielectric liquid.
  • means are provided for drying the support before or after fixing the image.
  • These means can for example be combined with the fixing means when using hot fixing rollers. More simply, one will use infrared fixing means performing fixing and drying functions. These means can also be separated when cold fixing is carried out: for example when using pressure rollers, infrared tubes or hot air will be used for drying. It will generally be desirable to provide ventilation to vent the vapors given off. In many cases, however, these drying means are not necessary when the liquid used has suitable volatility.
  • this dielectric liquid must properly wet the copy medium on which the transfer takes place so that a thin layer of liquid is effectively present at all points of the medium during the transfer.
  • the dielectric liquid pure or mixed aliphatic hydrocarbons, branched or not, the boiling points of which range between 60 ° C. and 230 ° C. and preferably between 100 ° C. and 200 ° C.
  • the dielectric liquids used will not be solvents for the photoconductive layer in order to avoid damaging the latter.
  • these liquids will not be solvents for the resins used for the production of the developing powder so as not to cause even partial softening of the toner which would then be liable to be fixed on the photoconductive layer in a detrimental manner.
  • the quantity of liquid deposited on the copy medium depends in particular on the running speed of the copy medium, the nature of the latter (porosity, etc.) as well as the nature of the dielectric liquid (evaporation rate , etc ). It also depends on the distance between the means for coating the liquid on the support and the place of transfer of the powder image. In general, it has been found that an amount of liquid between 0.1 g / m 2 and 16 g / m 2 makes it possible to achieve the desired result. However, in most cases, it is found that an amount of dielectric liquid of between 2 g / m 2 and 5 g / m 2 gave excellent results, in particular when fixing the powder image by pressure and cold.
  • the transfer of the image of developing powder onto the copy medium is carried out according to the devices used and the nature of the copy medium under the action of an electric field or a corona effect device.
  • the parameters which require the use of one or the other transfer means as well as the voltages used are well known to those skilled in the art.
  • the invention presents a preferred variant with a device with three superimposed rollers, the upper roller being the photoconductor on which the powder image is produced, the two lower rollers being rollers metallic, the adjacent or photoconductive roller receiving the powder image, while the transfer of the latter onto any support is effected by pressure between the two rollers.
  • the upper roller being the photoconductor on which the powder image is produced
  • the two lower rollers being rollers metallic
  • the adjacent or photoconductive roller receiving the powder image while the transfer of the latter onto any support is effected by pressure between the two rollers.
  • it has been found that it is preferable to partially discharge, in particular by light radiation, the photoconductor before transferring the powder image, under the action of a field. electric, on the adjacent metal roller coated with dielectric liquid.
  • the magnetic brush 15 magnetically retains on its surface, the single-component magnetic toner which forms chains in grains such as 22.
  • the charges 23 of the charge image, formed on the photoconductor 9, approach grains of developing powder become polarized by influence.
  • the part of the grain, opposite the negative charge 23 takes an equal positive charge.
  • the electrostatic force between these two charges is then sufficient, due to the presence of the electric field created by the image of charges, to attract the grains of powder to the photoconductor 9, thus forming the image of powder 20.
  • the figures 2a, 2b and 2c are shown the three best known variants for transferring a loaded developer powder onto a support.
  • the polarities of the voltages are relative to positively charged particles, as explained in FIG. 1. It is obvious that the polarities of the voltages must be reversed in the case where the developing powder charges negatively.
  • the cylinder 10 connected to a positive voltage source is covered with a photoconductor 9 on which there is a powder image 20 which must be transferred to the copy medium 5 which moves on the guide medium 4 grounded.
  • the particles of developing powder are transferred to the copy medium under the action of the electric field existing between the photoconductive drum and the medium 4 and directed towards it.
  • the copy medium has the form of a conductive cylinder connected to ground, the transfer being improved by the pressure contact existing between the photoconductive drum and the cylinder 4.
  • the copy supports 2 stored in a cassette 1 are engaged on the support 4 when the user wishes to make a copy.
  • the copy support 5, already engaged is coated with a layer of dielectric liquid 8, contained in the reservoir 7, using the coating device 6.
  • the powder image is formed on the photoconductor 9 which covers the metal roller 10 connected to a positive voltage source, in the case where the toner is positively charged by influence.
  • a corona effect device 13 deposits a uniform charge on the photoconductor9.
  • the charge image is developed using the magnetic brush 15 and a powder image 20 is formed.
  • FIG. 4 illustrates a particularly interesting embodiment of the invention and with which certain examples given below have been produced.
  • the same means have the same references as in the previous figures.
  • the powder image 20 is formed with the same means and in the same way as in FIG. 3.
  • the image of powder 20 is then transferred to 2 l on the metal roller 16 put the mass.
  • This roller 16 is previously coated using the coating device 17 with dielectric liquid as defined above.
  • the image of powder thus transferred is then transferred again by pressure, onto the copy medium 5 which advances thanks to the rotation of the two rollers 16 and 18, the pressure of which also fixes the powder image 20.
  • the pressure between the rollers 16 and 18 is approximately 30 kg / linear cm.
  • the lighting device 25 ensures partial discharge of the photoconductor before transferring the image, when this is necessary.
  • the lighting device 24 makes it possible to completely discharge the photoconductor 9 before cleaning with the magnetic brush 29.
  • FIG. 5 represents an alternative embodiment of the invention specially intended for the reproduction of microfilmed images.
  • a photoconductive strip 9 will be used on which the image will be projected completely.
  • the charge image is then developed using the brush 15 and transferred as in FIG. 4, onto a metal roller 16 coated with dielectric liquid using the coating system 17.
  • a counter-roller 50 on the other side of the photoconductive strip.
  • the other elements have the same meaning as those in Figure 3.
  • FIG. 6 represents a prototype of a device according to the invention, in which the same elements as those of the preceding figures bear the same references.
  • the image of charges on the photoconductor 9 (under which a layer of foam 49 can be placed but which is preferably rigid on the surface) is produced using the image block 30 and the optics 14 after uniform loading using corona 13.
  • the image is developed using the developing powder 31 uniformly deposited on the brush 15 using the doctor blade 32.
  • the photoconductor is then partially discharged using the lighting means 33 whose intensity is adjustable using a flap 35 articulated around the axis 34 using a cam 36.
  • the image is then transferred to the roller 16 previously coated with dielectric liquid, contained in the reservoir 37, using the brush 17.
  • the powder image is dried by hot air sent by the fan 44 into the duct 46, the photoconductor also being dried by the hot air arriving in the conduit 45.
  • the image is then transferred and fixed by pressure using the two rollers 16 and 18 on the copy support 5.
  • the latter is detached from the cylinder 16 using the doctor blade 39, said cylinder being then cleaned using the brush 40.
  • the cylinder 18 is cleaned by the brush 41.
  • the photoconductor is discharged using the lighting means 24, after transfer of the image, then cleaned using the magnetic brush 47. The excess powder on this brush is recovered in the tank 48.
  • This example is carried out using a SHARPFAX SF 730 machine using a zinc oxide photoconductive surface, a single-component magnetic developer and a cold pressure fixing between two metal rollers.
  • the machine is used at 20 ° C and 65% relative humidity, the copy medium being ordinary paper commercially available under the name VOIRON VELIN SH.
  • a HMT 824/4 reference single-component magnetic developer sold by the company HITACHI METALS Ltd is used, with a volume resistivity, measured according to the above-mentioned method, equal to 3 ⁇ 10 10 cm cm 2 / cm.
  • the original to be reproduced is a screen having different ranges varying from 1 line per mm to 6.3 lines per mm and also having uniform parts enabling the optical density of the image to be measured.
  • the quality of the image obtained is poor: there is a tendency for the line to burst and a fairly average contrast of the image.
  • This dielectric liquid has a resistivity of 5 x 10 14 ⁇ cm 2 / cm at 20 ° C and a volatility index of 0.18.
  • the quantity of liquid deposited on the paper is approximately 3.2 g / m 2 . All the test parameters are the same as before.
  • the sheet of paper is then immediately introduced into the paper tray of the SHARPFAX SF 730 machine, and a printout is performed as before.
  • the comparison of the two images obtained with and without dielectric liquid shows a marked improvement in the quality of the image when the dielectric liquid is used.
  • the definition obtained in this case is 4.5 lines per mm and the image density is 1.61.
  • Example 1 The same test is carried out as in Example 1 using a matte polyester copy medium intended for the graphic arts and sold under the trade name REGMA FM by the company RHONE-POULENC SYSTEMES.
  • HMT 808 developer powder from HITACHI METALS Ltd. is used.
  • the copy made without dielectric liquid is unusable in practice, because the image is blurred, blurred, heterogeneous.
  • ISOPAR G dielectric liquid on this support before copying, one obtains an astonishing quality image by its homogeneity and its sharpness.
  • the improvement obtained is a function of the quantity of dielectric liquid deposited. This example also makes it possible to measure the influence of the quantity of liquid deposited, since the absorption of this type of support is zero.
  • Example 1 The procedure is as in Example 1 using the developing powder supplied with the SHARPFAX SF 730 machine, with a resistivity of 8.3 ⁇ 10 9 ⁇ cm 2 / cm by treating the VOIRON SH paper with isodecane. with a resistivity equal to 1 ⁇ 10 15 ⁇ cm 2 / cm and whose volatility coefficient is 0.22. This draw is compared to that obtained, all other things being equal, in the absence of dielectric liquid. Here too, there is an improvement in the sharpness of the line and the density of the image.
  • the device in FIG. 2b is used to transfer the image 20 to the copy medium 5.
  • the cylinder 10 will be coated with a layer of flexible foam of a few millimeters before having the photoconductive strip 9 on the outside. In this case, the quality of the transfer of the image.
  • the charge image formed on photoconductor is developed using HITACHI HMT403 toner with a resistivity close to 10 12 ⁇ cm 2 / cm.
  • the powder image is transferred at 400 V, after partial discharge of the photoconductor, onto a grained aluminum sheet for CRAO reference lithography (from the company AGFA-GEVAERT).
  • an image of HITACHI HMT 824/4 single-component toner powder with a resistivity equal to 3 ⁇ 1010 n cm 2 / cm is transferable.
  • a polyester sheet coated with a matting layer for the drawing Applicant's FM reference.
  • the sheet coated with 5 g / m 2 of ISOPAR G makes it possible to obtain a good quality copy and a transfer of 95% toner, the transfer being carried out at 300 V and partial discharge of the photoconductor.
  • the same experiment carried out without the dielectric liquid makes it possible to note a bursting of the image, just after the transfer of this one, at the time of the separation of the photoconductor and the support. In this case, the image obtained is so blurred that it is unusable.
  • Example 5 The experiment of Example 5 is repeated using a heat-fixable magnetic toner HMT403, from the company Hitachi with a resistivity close to 10 12 n cm 2 / cm.
  • the transfer is carried out at a voltage of 400 V, the photoconductor being partially discharged before transfer.
  • the image is transferred to VOIRON VELIN SH paper previously described. In the absence of dielectric liquid, the image is transferred at 80%, but it is blurred.
  • SHELL SOL T from the company SHELL OIL Cy
  • a clear image transferred to 90% is obtained.
  • the device shown diagrammatically in FIG. 4 and shown in more detail in FIG. 6 is used, with a zinc oxide photoconductor (dual-charge paper REGMA M 100 BC) developed with the HMT 824/4 toner mentioned above.
  • the receiving support is VOIRON VELIN SH paper. The transfer takes place at a voltage of 300 V by partially discharging the photoconductor.
  • the device of FIG. 3 is used in which the photoconductive strip is of the REGMA M 100 BC type.
  • This photoconductive surface has the distinction of being dual charge, that is to say, to accept both positive charges and negative charges. It is therefore possible, with this type of photoconductor, to carry out an inverted development of the image, that is to say, deposit the monocomponent powder on the discharged areas of the photoconductor, by applying a positive voltage on the magnetic brush. 300 V with respect to the support of the photoconductive surface, the photoconductor having an image of positive charges.
  • This comparative example summarizes a certain number of tests carried out with the device of FIG. 3 with different toners of variable resistivity.
  • the dielectric liquid used is ISOPAR G.
  • the voltage between the photoconductive roller and the roller 16, on the one hand, and the illumination of the photoconductive, on the other hand, were varied. view to get the best picture possible.
  • the same experiments were carried out, in the absence of dielectric liquid. In the presence of dielectric liquid, the results obtained are as follows:
  • the resistivity of the toner is measured according to the method mentioned above. Illumination is the operation which consists in discharging more or less the photoconductor after development of the image, but before transfer of this one. In the absence of dielectric liquid, the results obtained are as follows:
  • This example shows the improvement obtained in the image quality for a given toner, a given transfer voltage, for a given partial discharge of the photoconductor before image transfer, as a function of the resistivity of the dielectric liquid used (experiment performed on the device of Figure 3).
  • a sheet of REGMA R 220 reference electrophotographic paper is loaded uniformly using a negative sign corona device.
  • the drawing of the printed circuit made on a transparent original is brought into contact with said sheet of paper, the assembly then being exposed to light.
  • the charge image thus formed is then developed using a HMT403 one-component developer powder.
  • a sheet of copper-coated epoxy glass is then treated with nitric acid in order to give good wettability to the copper-colored face which is then coated on one half with a thin film of ISOPAR G, the other half on the copper-colored face. not being treated.
  • the copper plate is then placed on a grounded metal plate, the copper side up. An electrical contact is established between the metal plate and the copper-colored face which is thus earthed.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Soft Magnetic Materials (AREA)
  • Hard Magnetic Materials (AREA)
EP81400672A 1980-05-12 1981-04-29 Procédé de reproduction électrographique sur un support quelconque à l'aide d'une poudre de développement magnétique monocomposant Expired EP0040128B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400672T ATE15558T1 (de) 1980-05-12 1981-04-29 Verfahren zur elektrographischen reproduktion auf einem traeger unter verwendung eines magnetischen einkomponentigen entwicklungstoners.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8010611A FR2482323A1 (fr) 1980-05-12 1980-05-12 Procede de reproduction electrographique sur un support quelconque a l'aide d'une poudre de developpement magnetique monocomposant
FR8010611 1980-05-12

Publications (3)

Publication Number Publication Date
EP0040128A2 EP0040128A2 (fr) 1981-11-18
EP0040128A3 EP0040128A3 (en) 1982-09-15
EP0040128B1 true EP0040128B1 (fr) 1985-09-11

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EP81400672A Expired EP0040128B1 (fr) 1980-05-12 1981-04-29 Procédé de reproduction électrographique sur un support quelconque à l'aide d'une poudre de développement magnétique monocomposant

Country Status (8)

Country Link
US (1) US4373016A (da)
EP (1) EP0040128B1 (da)
JP (1) JPS575068A (da)
AT (1) ATE15558T1 (da)
CA (1) CA1175474A (da)
DE (1) DE3172202D1 (da)
DK (1) DK206381A (da)
FR (1) FR2482323A1 (da)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571059A (en) * 1983-10-17 1986-02-18 Minnesota Mining And Manufacturing Company Apparatus for transferring images of conductive toner powder
FR2557317B1 (fr) * 1983-12-22 1986-04-18 Rhone Poulenc Syst Procede de reproduction electrophotographique, avec developpement inverse, sur un support conducteur a l'aide d'une poudre de developpement magnetique monocomposant et dispositif pour la mise en oeuvre du procede
US4661431A (en) * 1984-09-27 1987-04-28 Olin Hunt Specialty Products, Inc. Method of imaging resist patterns of high resolution on the surface of a conductor
US4786576A (en) * 1984-09-27 1988-11-22 Olin Hunt Specialty Products, Inc. Method of high resolution of electrostatic transfer of a high density image to a nonporous and nonabsorbent conductive substrate
US4569895A (en) * 1984-10-30 1986-02-11 Minnesota Mining And Manufacturing Company Charge transfer media and process for making thereof
DE3786042T2 (de) * 1986-07-09 1993-09-09 Olin Hunt Specialty Prod Elektrostatisches uebertragungsverfahren mit hoher aufloesung eines bildes hoher dichte zu einem nicht poroesen und nicht absorbierenden, leitfaehigen substrat.
US4743939A (en) * 1987-06-01 1988-05-10 Xerox Corporation Intermediate transfer apparatus
US4859557A (en) * 1988-02-25 1989-08-22 Olin Hunt Specialty Products Inc. Dry powder electrophotographic toner with permanent master in electrostatic transfer
US5011758A (en) * 1988-02-25 1991-04-30 Olin Hunt Specialty Products Inc. Use of a liquid electrophotographic toner with an overcoated permanent master in electrostatic transfer
AU607347B2 (en) * 1988-11-15 1991-02-28 Olin Hunt Specialty Products Inc. Method of high resolution electrostatic transfer of a high density image to a nonconductive receiving substrate
JPH02163775A (ja) * 1988-12-16 1990-06-25 Matsushita Electric Ind Co Ltd 記録装置
US5361089A (en) * 1993-07-26 1994-11-01 Hewlett-Packard Company Method and apparatus for applying an adhesive layer for improved image transfer in electrophotography

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1153586A (en) * 1965-06-28 1969-05-29 Rank Xerox Ltd Formation of Induced Electrostatic Latent Images
US3647499A (en) * 1969-08-19 1972-03-07 Eastman Kodak Co Process for transferring dry developed electrographic images
US3627557A (en) 1969-08-27 1971-12-14 Xerox Corp Liquid development by reducing the viscosity of the developer on a roller applicator prior to development
JPS4934151B1 (da) * 1970-06-04 1974-09-12
US4007041A (en) * 1975-03-10 1977-02-08 Xerox Corporation Electrophotographic printing method
JPS53136836A (en) * 1977-05-04 1978-11-29 Ricoh Co Ltd Electrophotographic transfer method

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Publication number Publication date
DE3172202D1 (en) 1985-10-17
EP0040128A3 (en) 1982-09-15
FR2482323B1 (da) 1985-05-17
JPS575068A (en) 1982-01-11
ATE15558T1 (de) 1985-09-15
EP0040128A2 (fr) 1981-11-18
US4373016A (en) 1983-02-08
DK206381A (da) 1981-11-13
FR2482323A1 (fr) 1981-11-13
CA1175474A (fr) 1984-10-02

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