DE1772302B2 - ELECTROFRACTOPOTOGRAPHIC PROCESS - Google Patents

Description

4. The method according to claim 1, thereby constituting the final lithographic printing form. A indicates that at least one of the complete third electrostatic processes consists of entmenting Images (31, 32) on the surface of the winding of a charge image on a usual further hydrophilic image receiving material (41) 35 electrophotographic recording material with hydurch external pressure (42) transferred drophobic toner, which has the same properties as will. the recording material itself has. To the copy

5. The method according to claim 1, characterized in that it can be used as a lithographic printing form, indicates that at least one of the complements between the developed image and the mental images (31, 32) produce different properties on the surface of the background, further hydrophilic image receiving material by making the plate surface with a hydrophilicity exterior Heat is transferred. solution is treated. This will make the picture

6. The method according to any one of claims 3 background hydrophilic.

to 5, characterized in that as a further while these and other processes are fundamentally hydrophilic Image receiving material (41, 53) a 45 borrowed for lithographic purposes are applicable, occur lithographic plate made of paper is used. however, each has its disadvantages. The electrostatic

7. The method according to any one of claims 1 see method, there is a disadvantage, for example to 6. characterized in that the image in that secondary solutions to generate the generation of an activation solution based on the different properties of the light required sensitive layer (22) is applied. 50 image areas are necessary. For procedures that start with a

Removal of the hydrophobic surface that does not belong to the image through the evaporation of the photo-conductive Working shift is an unfavorable process flow because the photoconductive

The invention relates to an electrophotographic layer with vapors that are harmful when they evaporate

cal process in which an electrofractophotograph is generated. Furthermore, such a method is thereby

Fish recording material with a picture sensitivity that limits the selection of photoconductive substances

Catch material under the action of an electrical to those with relatively low boiling points and

Field is exposed imagewise, with limited image melting points. The main disadvantage

the adhesive strength of the photosensitive 60 in a process in which the lithographic

Layer on the substrate changes and by pressure forming by transferring an oleophilic

subsequent separation of the image receiving material toner image directly onto a lithographic plate

are placed by the recording material on the substrate, means that during the to-

and the image receiving material, transmission letters that are more complex to one another, deteriorate the sharpness of the image.

mental images of the photosensitive layer are adhered.

remain, as it was with DT-PS 15 22 744 already before- The object of the invention is to provide a method

was beaten. for the production of lithographic printing plates

For the production of lithographic printing forms, it is necessary to create an uncomplicated and simple

enables the division of printing forms in a short time. Transfer plate when exposed to light. A Tren-This method is intended to adapt to the voltage of the parts is then seen by subtracting the most lithographic conditions. to be flexible. graphic plate of the original image-bearing base achieved in a method of the type mentioned. The result is a viscous, this object is achieved in that either the 5 oleöphües image on the surface of the hydrophilic imaged hydrophilic image receiving plate, which accepts oily printing inks, material itself or a further hydrophilic The viscous image, transferred to the image receiving material as a lithographic process, is hydrophobic and the printing plate is used. binds oily printing inks. As stated in DT-PS 15 22 744, the xo leads to the fact that the generation of such images on the recording material is exposed to an electric field from the surface of a hydrophilic substrate while it is imagewise exposed. When the image configuration obtained is made possible with an H-separation of the substrate from the image-receiving thographic printing process. In the case of bin material, the light-sensitive layer breaks along the correct image selection, it is possible to produce the lines determined by the light image. Pressure is transferred independently, while the rest of it remains on the layer - from the nature of the original image to be produced, so that on one surface can be. Furthermore, the high sensitivity enables a positive image and on the other a negative image, either the photosensitive one used in the process. B. a projection system collation through one of these parts through men with transparent templates, one or both parts can also consist of a conductive material for the production of the lithographic printing gate. The recording material used in the electrophotographic process can have special electrodes placed opposite one another, and the recording materials used are explained in more detail in Occupied Pages of a Non-Conductive Layer Support of the above-mentioned DT-PS 15 22 744. The and a non-conductive image receiving material hold separated hydrophilic image receiving material. Here, too, either or both of the viscous image should then be used in a hthogra combination of electrodes and the respective associated printing process - Not to allow phile disk as part of the record order. The resulting positive material can be used for their production or negative image on the surface of the image- different embodiments applied werpmofanesmaterials is naturally oleophilic and the. In one embodiment, both can be set using oily inks. The hydrophilic image-receiving material provided with an image and seen on the image-receiving material is then applied to the surface of a lithographic plate, graphic printing press and litho-transferred for the lithographic printing press. The recording material is used for printing. The printing process is brought into contact with the surface by means of commercially available wetting solutions on a lithographic plate, for example, and lithographic printing inks are carried out. The image with a paper or a rough aluminum undertone easily takes the oleophilic pressure position, and pressure is exerted by guiding the arrangement thus formed between two steel rollers. Other embodiments are also possible. The force acting during the transfer step in which the lithographic base is not a part of the recording material is generally limited. In the case of such an embodiment, which is selected by the lithographic flap, the result obtained is positive or correct. Is beispielswe.se paper used as negative Büd on the surface of the substrate, a pressure of 141 .kg / cm act before a barren the image receiving material in areal loading harmful effect on Ρ ^ ™ ^ 'ί ™ £ rührune usual with a lithographic plate, 50 The image is generally placed within this ref. B on paper, and the image is effectively transferred to rich. In another embodiment of the image transfer, which is superfluous due to the action of external pressure, is suspected

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RlCKLUI III WHU Uija inn uwiii v, _u , _, _ww

Recording material generated image on the image of the surface of the support or of the

receiving material or positive or negative image generated on the substrate in the receiving material Surface contact with a conventional one through the action of an activating liquid lithographic plate for forming a second recording in a manner similar to that previously described brought with the lithography 65 activated. A lithographic plate is over the image see plate then serves as image receiving material. placed so that a second recording material ge-through proper adjustment of the applied voltage at which the lithographic plate becomes an image the image is used on the surface of the lithographic receiving material. At this arrangement is

creates an electric field. During the exposure to radiation energy, which is indicated by the lines 29

The electric field is sensitive to light. At the same time, an electric field acts, which

Liche layer is generated evenly with electromagnetic ches by the voltage source 30.

When exposed to radiation, this is combined with an image. Due to the properties of the light-sensitive

See image receiving material as a component 5 layer 22 breaks the layer along the through the

of the second arrangement is used, electromagnetic radiation is given to certain lines, where-

in contrast to the initial image generation, an image 32 appears when the arrangement is separated

set polarity selected. If the image-receiving material 26 is created while the

If the layer carrier provided is used, then the complementary image corresponds to 31 on the layer carrier 21

The polarity chosen remains that of the initial image. Is the image receiving material a lithographic

generation. While retaining the adjacent chipboard, for example a piece of paper, the result is

In this preferred embodiment, the lithographic plate is of the arrangement

voltage deducted, with the image now on the upper printing forme directly.

surface of the lithographic plate adheres The acti- In F i g. 4 a is a lithographic plate in the form of vating liquid can evaporate, and the resultant sheet 41 of paper on the image on the surface is fixed, for example by the action of heat in the image receiving material 26. It. this then results in an image placed which is determined by the in FIG. 3 shows the original image, which was generated by an active light exposure. By means of the pressure roller 42, the fourth transfer on the lithographic plate, a pressure is exerted on the arrangement shown. FIG. 4b shows the separation phase of the image. The invention is described with reference to the transfer method in the drawing, in which the exemplary embodiments shown in lithography are described. There plate 41 is peeled from the image 32 and the image receiving material 26, creating a tough-F i g. 1 shows the section of a used recording liquid oleophilic image 45 on the surface of the material, »5 lithographic plate 41, which shows the printing

F i g. 2 forms the section of another embodiment

form of a recording material, FIG. 5 shows the production of a positive-positive F i g. 3 the side section of a recording printing form by light activation. After the ore material to show the exposure and its movement of the image 31 on the surface of the layer effect The image-receiving material is applied to the light-sensitive layer, support 21 (FIG. 3) F i g. 4 a and 4 Ib show a method of transmission with its electrode removed from the arrangement according to FIG. 3 generated image on the surface and a second combination of a transfer surface a lithographic plate and electrode 51 and a lithographic plate 53 FIG. 5 uses another embodiment of the over- instead, so that the in FIG. 5 wear of the generated image on the surface of a 35 pointed array. During exposure lithographic plate. a voltage of the voltage source 60 at the so-In Fig. 1 is a layer support 11 and a light-formed recording material is the upper sensitive Layer 12 shown This consists of the surface of the electrode 25 and layer carrier 21 photosensitive pigment 13, which is formed in an arrangement evenly with an electromagnetic binder 14 is dispersed above the light-sensitive 40 table radiation that is illuminated by the lines The borrowed layer 12 is located as the third layer that is indicated 61. When separated, the picture is from you Image receiving material 16. The entire arrangement surface of the substrate 21 on the surface is referred to as recording material. Transferred to the plate 53. The obtained lithographic The illustrated embodiment consists of the layer printing form consists of a viscous hydraulic carrier 11 and the image receiving material 16 from a 45 phobic image 31 on the surface of a lithographic electrical conductive material such as B. conductive fish plate 53, which in the present case made of Pa cell glass, wherein at least one surface is optically pierced

is clear to allow exposure of layer 12. Any suitable material may be used for lithographic printing. Printing form can be used. The surface of the structure shown in Fig. 1 is one of the 50 printing plates is inherently hydrophilic and of the simplest forms of recording material, one such that it is easily a water repellent picture other and preferably used structure which is firmly adhered and supported by printing ink Fi g. In this embodiment, the surface is not peeled off or is not washed off with a light-sensitive layer 22 due to the wetting of a non-conductive layer support 21 on its upper solutions during the printing process. Furthermore, he cannot see the picture. As in FIG. 1, the light-sensitive area of the printing form can easily be wetted with the coating of one of the various already described wetting solutions and holds an aqueous composition of matter. It is in the film on its surface, this non-existent case of photosensitive pigments being removed or formed by the lithographic printing ink 23, which can be displaced 60 when dispersed in a binder 24. The pressure plate can au; are. Above the light-sensitive layer there is any of the known substances, including the image receiving material 26. The non-conductive, for example, made of flexible waterproof paper, synthetic layer carrier 21 is on its back with a substance or thin metal foil,
Conductive electrode 25 is provided during the image. To carry out the method, any receiving material 26 can also be used, a conductive electrolyte 65 suitable wetting solution. Typischi trode 27 wears. such solutions contain a volume percent F i g. 3 shows the effect of selective gum cellulose in water, gum arabic in what is shown in FIG. 2 arrangement shown with water, glycerine in water or isopropyl alcohol ii

^b 8

Water. Distilled water can also be used as an arrangement. A method used to achieve wetting solution. Other typical low cohesive force in the photosensitive solutions are described in US Pat. No. 3,1 07,169. Layer consists in that relatively soft substances are also written. They can contain other ingredients, low molecular weight can be used. For example formaldehyde, and if glycerine is not present in a single grain, for example, a mono-Nalur layer can be added because of its hygroscopic component, and thus through an absorbent compound or a polymer with little water Extend the period of time while the molecular weight together with a Lewis acid whose surface of the printing form is used to maintain its hydrophilic properties for high photosensitivity. The addition of formaldehyde affects this effect at the same time. Therefore, wetting two or more components in solid solution will be a solution with glycerol or formaldehyde, or both components will consist of a substance with a low molecular weight or mixtures thereof, so that the layer detects the resulting printing form has desired low cohesive force. This can be achieved with their use in the production of a heterogeneous layer of printing forms that are relatively sensitive to printing, compared with other lubricants. That binlange be stored. Solutions with gum arabic in the heterogeneous arrangement can also be very effective, since the lithographic printing forms themselves are sensitive to light, but this is not the case with emergency lithographic printing forms, so that even substances such as microcrystalline phile properties relatively long after removal 20 Wax, paraffin wax, polyethylene with little retained from the press, so that the respective molecular weight and other polymers with low printing forme can be reused as a binder only after the wetting solution without additional treatment with a gem molecular weight. Any suitable lithographic printing ink can be selected and applied to produce the desired effect. Typical such colors and their 25 without regard to their sensitivity to light. ! Properties are in "Ink Technology for Printers This also applies to a homogeneous arrangement consisting of two components j and Students" from EA Apps, 1963, Part II, in which no light chap. 11. The inks have the same sensitive substances with the desired basic physical structure as good letterpress inks see properties in solid solution with light and they consist in their simplest form of a 30 sensitive substances can be used.
Mixture of pigments in a lithographic It has already been stated that the coating lacquer is dispersed, for example in a thickened carrier and / or the image receiving material or linseed oil. The lithographic oily printing ink is sen base can be conductive and for this purpose made of j oleophilic and adheres to the hydrophobic image. made of conductive cell glass. By using it, the hydro- 35 such flexible, transparent conductive substances that do not belong to the picture! phile surface parts repelled. the result is usually a relatively weak base. Any suitable light-sensitive pigment can therefore be made possible by a non-conductive support! are used in the new process, with and an image receiving material with an underlying selection largely from its light-sensitive electrode, the use of solid non-conductivity and its sensitivity spectrum, as well as the use of polymers such as polyethylene, polypropylene, poly, corresponding to the desired contrast of the ethylene terephthalate, cellulose acetate, a vinyl chloride Image, depends on the use of a heterogeneous or vinylidene chloride copolymer as well as similar substances, homogeneous arrangement and similar considerations This type of solid polymer does not only form a strong one. For the heterogeneous arrangement, the light-electrical barrier layer between the electrodes and sensitive particles itself can consist of one or more layers of image material, which avoid electrical flashovers within the known light-sensitive pigments within the arrangement. If they are of a lithonic or inorganic nature and are produced with graphic printing form directly, this has any suitable non-conductive resin in dispersion, receiving material in the form of a hydrophilic solid solution or interpolymerized together to form a lithographic plate, wk, the resin not even light-sensitive z. B. paper, rough aluminum, etc., as must already be borrowed from. The resin is said to be the dispersion of the part- was carried out.

make it easier to avoid undesirable reactions between

the binder and the photosensitive pigment, the following preferred embodiments. At

or between the photosensitive pigment and 55 parts and percentages relate, if not, to

avoid the activating agent and others otherwise stated, on the weight,

fulfill borrowed purposes. Such resins are poly.

ethylene, polypropylene, polyamides, polymethacrylates, B e 1 s ρ 1 e i e l and II

Polyacrylates, polyvinyl chlorides, polyvinyl acetates, a commercially available metallic phthalocyanine:

Polystyrene, polysiloxanes, chlorinated rubbers, poly-60 are first transformed into EnI by leaching in acetone

Acrylonitrile, epoxy resins, phenols, hydrocarbon removal of organic impurities

Resins and other natural resins such as rosin- As this step is a less sensitive crystalline

derivatives as well as mixtures and copolymers resulting in the- /? -form, the desired a-shape is durc

these substances. Dissolve 100 grams of the /? Form in 600 cci

As has already been stated, the light-sensitive sulfuric acid, precipitates in 3000 ecm of ice water and

Lent layer produced a relatively low cohesive force as a neutralization wash with water. D <

Own coating or after activation. This obtained purified ^ -phthalocyanine becomes 6 Taj

naturally applies to homogeneous and heterogeneous long ground in a salt mill and distilled

509586/423

tem water desalinate, vacuum filtered, brought with water running and at a speed of and finally washed with methanol until it is 2.54 cm / sec between steel rollers of 7.6 cm The filtrate is clear and the x-shape of phthalometer, which is cocked with a force of 726 kg, cyanine yields. Passed through after vacuum drying. The acting total force distance remaining methanol becomes the x-form of the 5 carries 143 kg / cm. A copy of each picture Phthalocyanine for the production of an image layer is applied in this way to the respective lithographic used by the following procedure: Transfer 2 grams of plate. Each with a picture a microcrystalline wax with a melt lithographic printing form is then in a usual point of about 101 ° C and 0.5 grams of a microlithographic printing press used and under crystallines Wax with a melting point of io using conventional wetting solutions and about 65 ° C is used for printing with a ternary blend of lithographic inks. 1.25 grams of the above pure x-phthalo

cyanins, 0.8 grams of l- (4'-methyl-5'-chlorazobenzene- B eis ρ ie 1 e III and IV
2'-sulfonic acid-) 2-hydroxy-3-naphthenic acid, CI No. The procedure described above is carried out until 15 865, and 1.25 grams of I, 2,5,6-di (C, C'-diphenyl) - i ₅ to separate the image receiving material from the thiazole-anthraquinone, CI No. 67 300, repeated in 60 ecm layer support. The reagent petroleum ether mixed with the generated image. These prepared areas are placed under pressure in a glass jar with a capacity of 0.471 with a large lithographic opening together with 0.24 l of porcelain balls, a rough aluminum plate, and 1.27 cm in diameter. The lid so there is an imprint of the respective image on this of the vessel is sealed to prevent contamination. To avoid the aluminum printing forms obtained. The mixture is then milled at 90 revolutions - meeting the requirements of the lithographic rotations per minute for about 24 hours.
len. Then add another 20 ecm of petroleum ether

added. The mill is then operated for a further 15 minutes

turned long. A uniform coating of the corresponding to Examples I and II is a

The resulting paste is made on top of a layer paste and an even over-

0.05 mm thick polyethylene terephthalate film with pull from this paste on a 0.05 mm thick poly-

A spreading stick applied The coating is applied to ethylene terephthalate film, which is on a

30 glass electrode is attached to the air for about 5 minutes at room temperature? The light sensitive

dries. Seme Starke _W1 rd with a layer of about 2.5 microns is coated with a 5% solution of the described

measure up. The air-dried support is then activated benen type, after which another film than

with the Sch.chtuberzug up on the elek image receiving material over the activated layer.

S ^ J ^ i ^ p-Ä ^ ä? ^ ^{Glass' sets If} · ^"as image-Mate lallst with an electrode attached to 1 cc of a 5" / o activation 35 black opaque conductive paper hinlosung a styrene copolymers m a kerosene terWt j " Α "'"; u iciuamgcii ra ^ u
an edge portion of the horizontal reasonable 70ü0 Vo ^ f ^ šbel Tf "'^ S applied yJTSZ arranged the support. A second of dieTSektmLn" longitudinal 7 ^ * T η ·? f S 0.05 mm thick polyethylene terephthalate film is used, and II HV A ⁸ ^ f ^ Γ ^Beis P ^ie ! ^E "
the Schichtübemig with the activation solution up 40 SurdSX i £ Sw ί ^ ^{6 dS} P ^ositiv * "brought f, and oie activation solution is spread over the substrate by a SRDI dl AnorJ dike STSÄ electrode as a negative electrode rnäßia," Connecting dei ^ Tension rubber roller is rolled once over the image receiving material ndl ™ ^ "V ^ei " ^{em Uc} ^ ^tbud * nt. A sheet of electrically conductive water _{through the} c? dTti ^ S ^ ^ Τ ^ ϊ & *? "% ί Paper, which serves as an opaque electrode, is placed ₄₅ SS SS T ₁ ^ electrode through each over the second film. A voltage of about Sa 5 s5" S ^Behchtun 8 ^be , ^tra f ^{l about 0> 54} _u ^Lu * ^fm 10,000 volts via a resistor of Sundtnth 'T u T ^^^ a ^ IZ 1250 megohms to the transparent and the impenetrable mZZ _{t "n} ^ B. ^elic Pla be the electrode Bildsichtige applied, wherein the positive pole Γη S fh the opaque electrode at the glass electrode liegf- about 5 seconds after 50 SdS bleibf N ^ '^ "ΐ ^{diC voltage} TFI switching on the voltage, the Mehrfachplat- is Sch! htträ _{e r} 'It n " - ¹ ^ iIT ⁸ ^ " ΐ Ζ the arrangement exposed to a photograph by KaSd Jf ^ t ^? ^{Π &} Τ ^{LMD _εηΐ5 Ρ ΓεΛε τ η τ} ^ a negative kontinuierüch toned image through the kehmne L · ΐ P image receiving material has a UmtranspaWnte glass electrode is projected through the wSden dn 1, S ^SLTL ^ ^{blld to recognize} · ^{Both Bl1} "The exposure is about 0, 54 lux by means of Glflh- 55 of 7 ^ c ff "? STW '^^ ^T ^ ^P 1Z lamp of about 2800 ° K for a duration of about erafischen pSt ΐ ■ ^{M Is with 611161} L μ 4 seconds, which is a total of impacting energy and _e f _{n A} hf of paper m touched * by gives about 2.16 Luxsec. About 3 seconds nSh DrucSÄfwi ^^^^ · ^BHdeS τ ^ STd of the exposure, the image receiving material and Ae (KSE ^ · ΐ ^{the examples l and H} _T ^a " ^f the opaque electrode are peeled off by hand 60 PaoienSS»? ^ "- ^Pa P ^ier P ^latte transferred. Each while the voltage of 10,000 volts remains switched on ffiÄÄ Γπΐ ? ^erk jf ^mlid f "^ fl ^. After the separation there is a copy ^{on the licher Benftv,? 1 - nter use} of the original negative un ^ fa ^ _r b _s "" fosungen and lithographic printing reversal or a positive image on the image receiving material. Both images are heat up by ice 65 B ρ ie 1 e VII and VIII
mung to a temperature of 71 ° C with a Das vnret ^ » a · j ~ 1
hot plate fixed. Each picture is loaded with the upper, writes ^ v ^ V " ^{the Be5s} P ^ cn V and VI

side of a lithographic plate made of paper in an image file for ·? ^ ^{0 until the separation} S ^deS

^{1 ßliae of receiving} material from the layer carrier.

11 12

repeated. The images provided with the resistance to the positive pole of the voltage are connected under pressure with a roughened lithographic source. A voltage of approximately aluminum plates similar to that in Examples I 7000 volts is brought into contact with this multilayer arrangement and II, and an imprint of the is switched on. After 5 seconds, the image is transferred to the aluminum plates 5, together with the opaque one, as a result of which lithographic printing plates are removed from the electrode, while the voltage of from results. 7000 volts is still switched on. On the surface of Examples IX and X ^{there is a} lithographic aluminum base

a viscous picture. The picture is due to this

On the surface of an image receiving material io heating the plate to a temperature of 135 ⁰ C.

and a support are fixed as in Example I, creating a lithographic printing form

and II images are generated. After the breakup and the surrender.

Fixing the images are each in immediate example XH

Contact with the surface of a lithographic ^v

Brought aluminum plate. The obtained more- 15 5 grams of a microcrystalline wax with

layered arrangements will be at 121 ⁰ C with about a melting point of about 71 ° C

Use a normal iron for 1 minute to make a three-component mixture of 3 grams of metal-free

heats, whereby the acting force is only due to x-phthalocyanine from Example I, 2 grams of a red

the weight of the iron is caused. A pigment and 1 gram of a yellow pigment

Imprint of each picture is mixed on the ao mentstoffes in 100 ecm petroleum ether, the

respective lithographic plate is cleaned with a clay filter to form one. This preparation

Transfer printing form. is about 90 revolutions per minute

Milled η · · 1 vT ^ hours in a ball mill. the

Example Kl paste obtained is heated to a temperature of about

A layer paste is heated according to the method of 65 ° C and then prepared to room temperature from Examples I and II. A more evenly chilled. A uniform coating of the paste is then applied to the surface of a 0.05 mm thick polyethylene terephthalate film with a spreading stick on a spreading stick on the surface of a 0.05 mm thick film and brought to room and results in a light-sensitive Layer by tempering ¹ ur air dry for about 5 minutes. The 3 ° is about 2.5 microns thick. This is at room temperature or the light-sensitive layer is air-dried at around temperature for about 5 minutes. The so measured 5 microns. The air-dried support is then coated with the photosensitive layer on a glass electrode as in the foregoing and then fixed on top of the electrically conductive surface, and the surface of the layer is fixed with a transparent glass electrode. An activated solvent that has a viscosity of about the activation solution similar to that of Examples I 0.65 centistokes. This fabric is applied along a and II, and a 0.05 mm thick edge of the backing is applied. The layer of image receiving material is placed on top of the layer of image material being coated with a lithographic aluminum plate. An opaque, conductive surface is placed on the image receiving cover, and a rubber roller is passed over the free upper material, whereby the activating agent is black paper electrode and completes which is evenly distributed over the layer. A sheet of recording material. A voltage of about electrically conductive black paper is connected to the electrode arrangement over the 7000 volts is connected over a resistor of 51 meg aluminum plate and serves as an opaque ohm to the electrode arrangement. A voltage of around 3000 volts is applied when the positive pole is on the glass electrode. Approximately 45 across a resistor of 51 megohms to the electrode, 5 seconds after switching on the voltage, the electrode arrangement is switched on, the glass electrode arrangement being exposed to a light image in which the electrode is positive and the black electrode is negative. a negative, continuously toned image through which a transparent glass electrode is projected about 5 seconds after the voltage is switched on. an exposure is made by projecting a nega-The exposure is about 0.54 lux for 5 seconds through the continuously tinted image through the glass electrode, which is about 2.7 luxsec. The post-exposure exposure is about 5 seconds with the opaque electrode of 1.08 lux. Hand peeled off about 3 seconds after exposure, keeping the 7000 volt aluminum image-receiving material turned on. After this separation, the opaque electrode is turned on and voltage is removed from the surface of the image receiving material. On the surface of the litho an image. This is accomplished by heating with a graphical Hei aluminum plate is to recognize an image, fixed SEN plate to a temperature of 71 ⁰ C. this is fixed by heating to a temperature of 71 ° C on a hot plate. This ausnium plate is connected to the negative pole of the voltage source. A thin layer of petroleum - a lithographic printing form with an image on the outside, which was also used to produce the image material - the surface of a lithographic aluminum paste, is used as a coating on the surface plate.

applied to the aluminum plate, and the image of B ice Diel XIII

Image receiving material is used together with its 65 ^μ

Pad and the opaque electrode. The procedure of Example XII is repeated

the petroleum ether layer applied. The conductive one instead of the aluminum plate is a lithograph

opaque electrode is used over a 51-megohm- fic sheet of paper. The real ones

Xabi-Ü-

The voltage switched on for the exposure is 4000 volts, and the exposure takes place at about 2.7 Luxsec start. On the surface of the paper the result is an image which enables the plate to be used as an ideal lithographic printing form.

Example XTV

The procedure from example ΧΠ is repeated with the difference that the aluminum image receiving material is on a 10 cm aluminum roll Diameter is drawn and this arrangement over the activated layer when connecting a Voltage of 4000VoIt and exposure with an image is rolled at about 3.6 Luxsec. The received Aluminum printing form is made from aluminum roll removed and used in a lithographic printing process.

Example XV

20th

A photosensitive mixture is prepared according to Examples I and II and used as a Coating applied to the surface of said film with a spreading stick. The coating will air-dried at room temperature for about 5 minutes. The substrate obtained is with the photosensitive layer attached to the top on an electrically conductive, transparent glass electrode. The layer is activated with an activation solution as in Examples I and II, and a 0.076 mm strong aluminum lithographic plate is placed on top of the activated layer. A second aluminum plate is placed on the first aluminum plate and serves as the second electrode of the arrangement. One Voltage of about 4000 volts is turned on through a 51 megohm resistor and it takes place an exposure to a light image at about 5.4 luxsec, about 3 seconds after the exposure the aluminum image-receiving sheet with its electrode is pulled off by hand while the voltage remains switched on. A viscous one results on the surface of the image receiving material Image, and the plate thus obtained is used as a lithographic printing plate.

Example XVI

The procedure of Example XV is repeated, but instead of the aluminum image receiving material, is used a lithographic plate made of paper is used. The paper printing form obtained is in used a lithographic process.

1 sheet of drawings

Claims (3)

Λ a number of procedures are known. For example, patent claims: ^ Such a printing form can be produced by electrostatic imaging processes, with lithographic 1. Electrophotographic process, with graphic printing form in the conventional way An electrophotographic recording 5 wrapped electrophotographic copies are used. at material with an image receiving material under such a process is that for development By the application of an electric field to the image of the charge, toner inherently uses is exposed, whereby the adhesive becomes hydrophobic, making the copy resistant to lithography the photosensitive layer on the fish printing ink can be wetted. After Layer substrate changes and by subsequent io generation of the toner image on the surface of the Separating the image-receiving material from the reflective layer, this is applied to a lithographic material on the substrate and graphic plate, for example on a corresponding The aluminum plate completely machined to one another is transferred to the image receiving material. Then it will be mental images of the photosensitive layer the image on this base by the action of heat stick, thereby marked-15 fixed, whereby the final printing form erne erne t that either gives that with a picture (32). Another electrostatic method for See hydrophilic image receiving material (26) production of a lithographic printing form itself or a further hydrophilic image in that a photoconductive material as a coating pre-receiving material (41) transferred image (31, 32) is seen at relatively low temperatures is used as a lithographic printing form. 20 evaporates, for example anthracene or sulfur 2. The method according to claim 1, characterized on the surface of a metal foil that is specially designed for indicates that the exposure is suitable for the lithographic purpose. On the photoconductive base (21) takes place through and that a charge image is generated as a capable coating and Image receiving material developed a hydrophilic lithographic. The toner powder is inherently hydroic Plate made of paper is used. 25 phobic and also has a relatively low melting 3. The method according to claim 1, characterized in that point. The metal foil is identified at a temperature that at least one of the complexes that causes evaporation of the photoconductive layer mental images (31, 32) on the surface of the in the non-image areas causes, so that the hydro wider hydrophilic BiH receptor material (53), phobic toner image remains on the plate. the transmitted by external light (61) heating continues until the image is developed will. is fixed on the plate surface and thus the