DE1772302A1 - Method of making a lithographic duplicating plate - Google Patents

Description

XEROX CORPORATION
Rochester, NY 14 603
United States

MÖHLSTRASSE 22, CALL NUMBER 48 3921/22

Method of making a lithographic duplicating plate .

The invention relates to reproduction, particularly to lithography.

Lithographic printing is a well-known and mature technique. In general, a flat printing plate is used here, which is composed of various printing properties of the image areas and the background areas. In conventional lithography, the parts of the image that do not belong to the image are hydrophilic, while the parts of the image surface are hydrophobic. During the lithographic printing process, an aqueous I ¹ IuB solution is applied to the plate surface to wet the parts of the surface that do not belong to the image. This solution keeps the plate moist and prevents foaming. An oil-based printing ink is applied to the image area and stored

009885/0911

only in the parts of the image, while the hydrophilic parts that do not belong to the image repel this color. D ₀ s inked image can then be transferred directly to a copy sheet or other image carrier, generally the transfer is made ijecloch to an offset blanket, which in turn transfers the print to the final copy sheet. Thus, for each print, the lithographic plate is first moistened with an aqueous flow solution and colored with a lithographic printing ink, after which the image is transferred to an offset surface and finally printed.

A number of methods are for making lithographic printing plates known. For example, such a plate can be produced by electrostatic imaging processes, using as The lithographic mother plate is used for conventionally developed xerographic imaging plates. In such a procedure The synthetic resin powder used to develop the electrostatic charge image is inherently hydrophobic, which makes it nLt a lithographic printing ink can be wetted. After the formation of the powder image on the surface of the photosensitive This coating is applied to a lithographic surface, for example transferred to an appropriately machined aluminum plate. Then the picture is on this base by the action of heat fixed, resulting in the final printing plate. Another electrostatic method of making a lithographic Printing plate is because it is finely more photoconductive Fabric is provided as a coating that is at relatively low temperatures evaporates, for example anthracene or sulfur on the Surface of a metal foil specially designed for lithographic

009885/0911

BATH ORIGINAL

_ 3 -

Purposes. A will appear on the photoconductive coating creates and develops an electrostatic latent image. The developing powder is inherently hydrophobic and also has a relatively low melting point. The metal foil is on a Heated temperature causing evaporation of the photoconductive coating in the parts of the surface that do not belong to the picture, so that the hydrophobic- P ^ veiteiM * «* £ '** p plate ^ £ fz & $ eji £ fe! Mrl% $ · ϊ Heated tiog'w4rd foj * fcg # setzf> until the eatMek ^ lti ^ liid on dta? surface is fixed and thus the final lithograph! - j | see pressure plate represents. A third electrostatic process consists in developing an electrostatic latent image on a conventional xerographic binder plate with hydrophobic synthetic resin powder which has the same properties as the binder plate himself has. In order to be able to use the plate as a lithographic printing plate, between the developed image and the Background creates a difference in-which the plate surface is treated with a conversion solution. This makes the image background hydrophilic.

Other non-electrostatic methods have been suggested for making lithographic printing plates. In one case is the hydrophobic base is covered with a hydrophilic metal film, and the metal surface is coated with a photosensitive material. This photosensitive plate is then selectively exposed and developed. The developed area will etched, leaving the metallic hydrophilic film in the unexposed Surfaces is removed and a pattern of the underlying hydrophobic synthetic resin is created. The remaining one photosensitive coating is then removed so that a final

009885/0911

BAD ORIGINAL ~ ⁴ ~

term plate is created, the image surface parts of which are hydrophobic and the surface parts which do not belong to the image are hydrophilic. A second The non-electrostatic method of making a lithographic printing plate is to use a support with a hydrophilic, water-binding, ink-repellent substance composition is coated, which contains a proportion, which becomes hydrophobic when exposed to heat. The coated base is brought close to the original image to be copied. Infrared radiation is then directed onto the original image so that a heat pattern corresponding to the image pattern of the Original image is created, which in turn is transferred to the sensitive hydrophilic coating. Those affected by the heat Surface parts are brought into a hydrophobic state in this way, so that a hydrophobic image on a hydrophilic Surface arises.

While these and other processes are basically for lithographic Purposes are applicable, however, there are disadvantages in each case. There is a disadvantage with electrostatic processes, for example in that secondary solutions to generate the necessary different properties of the picture surfaces are necessary. Other methods require additional mechanical or chemical Treatments that cause the image quality to deteriorate when the reproduction plates are used. With those Process that involves removing the non-image hydrophobic areas through evaporation of the photoconductive Work compositions of matter, an unfavorable process flow is given because the photoconductive substances in their Evaporation will produce harmful fumes. Furthermore, there is such a thing

009885/0911

"BAD ORIGINAL

Method limited by the fact that the selection of the photoconductive Substances to those with relatively low boiling and melting points is limited. The main disadvantage of a process in which the lithographic plates are transferred by transferring a oleopMl.en synthetic resin image directly on a lithographic base is made during the powder transfer step the sharpness of the image is deteriorated.

The processes that do not work according to the electrostatic principle also have limited use. In each of the named Processes, as well as other similar processes, have fundamental disadvantages. In general, there is a main disadvantage that cumbersome preparations * for the production of final pressure plate are necessary. They also need The procedure is generally a chemical treatment, long exposure times and very strong light sources to initiate the necessary chemical changes as well as use of the photosensitive ones Plate relatively shortly after its production.

The object of the invention is therefore to provide a method for making lithographic duplicating plates which avoids the aforementioned drawbacks. The aim is to make printing plates simple and uncomplicated enable in a short time. This method should be very flexible to adapt to the most varied of conditions.

The above and other traits are, generally speaking, achieved by the invention by a multiple plate arrangement is made. A photosensitive image material feed

009885/0911

BAD ORIGINAL " ⁶ ~

composition is applied to the surface of a donor pad and according to one embodiment of the invention Process uses a lithographic or otherwise hydrophilic receiver sheet on the surface of the building material layer for formation placed on the bin assembly. At the anoiinung will An electric field is generated during an exposure to a Light-shadow pattern is made. When separating the donor sheet From the reception sheet breaks the light: bark of animal material layer along the lines indicated by the light pattern,

part of the image layer being transferred to the receiver sheet, while the remainder remains on the donor base, so that a positive image is produced on one surface, on the? ^ others create a negative image. At least the donor sheet or the receiver sheet is transparent so that exposure can take place through this element. Furthermore, one or both parts are made of a conductive material. The multiple plate assembly may contain particular electrodes on opposite sides of a non-conductive donor sheet and a non-conductive ψ the receiver sheet. Here, too, either one or both combinations of electrodes and the respectively associated element should be transparent in order to enable exposure of the image material layer from each side of the arrangement. The resulting positive or negative image on the surface of the lithographic receiving sheet is naturally oleophilic and binds oily printing inks. The hydrophilic substrate provided with an image is then mounted on a printing cylinder of a conventional lithographic printing press and used for lithographic printing.

lithographic printing inks performed. The 009885/0911

BAD OR ^ ^NAL - 7 -

hydrophobic image easily adopts the oleophilic Dnek colors.

Some other methods have been developed in which a lithographic plate is made in accordance with the invention when the lithographic base is not part of the multiple plate assembly. In such an embodiment, the positive or negative image obtained on the surface of the donor base or receiving sheet is brought into flat contact with a conventional lithographic base, for example a lithographic Pefler plate, and the image is transferred to this by the action of an external pressure. In a similar second embodiment, the image to be printed is brought into areal printing with the lithographic base and the image is made tacky, for example by a heat source. The sticky image is transferred to the lithographic plate base. In a third embodiment of the method according to the invention for producing a lithographic printing plate, the image produced with the multiple arrangement on the receiver sheet is brought into surface contact with a conventional lithographic plate substrate to form a second multiple plate arrangement, with the lithographic plate substrate then serves as a receipt sheet. By properly adjusting the applied voltage, the image is transferred to the surface of the lithographic plate base when exposed to light. Separation of the elements is then achieved by peeling the lithographic sheet away from the sheet bearing the original image. Document reached. The result is a viscous oleic image on the surface of the hydrophilic base, which accepts oily printing inks.

00S885 / 0911

ORIGINAL BATHROOM - 8 -

It has been stated that a viscous image produced in accordance with the invention with a multi-plate arrangement is hydrophobic and therefore binds oily printing inks. It was also stated that the formation of such images on the surface of a hydrophilic Underlay allows the image configuration obtained to be used in a lithographic printing process. at By setting the correct image selection it is possible to produce a lithographic printing plate with a negative or a positive print can be made regardless of the type of original image. Furthermore, the high sensitivity enables of the photosensitive substances used in the process according to the invention, the use of various exposure mechanisms

en- nisms such as a projection system together with transparent Original images.

According to the ErfSadung, a donor sheet is made by clicking on A tough, soft photosensitive imaging composition is applied to the surface of a donor pad. Although the photosensitive Image composition of a homogeneous layer of a single component or a solid solution of two or can consist of more components, the latter having the desired photosensitivity and physical properties, it turned out in general that preferably a light sensitivity Licher image coating is to be used, which consists of a dispersion of a light-sensitive pigment in a tough, non-conductive binder matrix. Optimal results is obtained when a metal-free phthalocyanine pigment is present in a change binder in the presence of a petroleum-like one Solvent such as petroleum ether is dispersed.

009885/0911

-% AD ORIGINAL

The composition of the image can be applied to the base by means of speech suitable methods can be applied, for example by pouring on or brushing, and the layer formed can, for example, by the action of heat or in air at room temperature to be dried. The final thickness of the donor sheet cover or the image layer is generally in the range from approx. 0.5 to approx. 4-5 microns, with a thickness of approx. 2 to approx. 35 microns is preferred because of its wide variety of Image transfers and plate making the best lithographic Pressure nut plate results. The one desired for the image layer basic physical property is that it is brittle and has a relatively low cohesive force in the Has state as a coating or after activation by introducing a liquid activating agent. The volume ratio of photo conductive pigment to binder in the dispersion or the heterogeneous system can be between approx. 10: 1 and approx. 1: 1Q but preferably ratios of approx. 1: 2 to used approx. 2: 1 for best results.

After the donor sheet combination has been prepared, a receiver sheet is placed on the surface of the image layer. Each An element of this arrangement formed in this way can be conductive and consist, for example, of conductive cellophane. Conveniently they are but in each case formed from a non-conductive material, the is attached to a conductive electrode. With a slectrodeless one System is the donor sheet and / or the receiving sheet transparent, so that the exposure from one or both sides the arrangement can be made. In an arrangement with electrodes

0098 35/0911 ^ _{n 0RIG | NAL} , ₁₀ -

are one or both combinations of electrode and respective Backing transparent, so that the exposure of the image material layer as with an arrangement without an electrode of one or both Se Lten can take place from «In a preferred embodiment of the invention The method uses Mylar, polyethylene terephthalate, as a donor pad with an underlying conductive electrode used. Such an electrode can consist of optically transparent glass, which is covered with a thin, optically transparent Coating made of conductive material such as tin oxide. A transparent glass NESA electrode turned out to be well suited for this. The receiving sheet is a lithographic plate base such as a hydrophilic paper plate which is made with an electrode is deposited, which is normally opaque and can consist of e.g. black paper that can be used for delivery.

After the arrangement described above has been formed, the receiver sheet is raised or the multi-plate arrangement is opened and applying an activating agent to the photosensitive imaging composition, after which the layers are reattached will. The activating agent can also be applied before the receiving sheet is laid on; any operational sequence is involved here suitable for the method according to the invention. The activating agent will normally be in the form of a dissolving liquid such as e.g. Petroleum ether applied. However, the activation step can be omitted when the photosensitive layer is produced in this way is that it contains a sufficient amount of solvent after the coating process, or when the image material layer has a sufficiently low cohesive force. Preferably, however, the activation script is carried out in order to produce

00 988 5/09 11

to enable a stronger and more permanent layer of image material, which has a longer lifespan and can be stored.

The activating agent can be applied by any suitable method are, for example, with a brush, a roller with a smooth or rough surface, by pouring, by steam condensation or similar processes, whereby spraying is expedient is carried out on the surface of the image material layer. To the application of the activating liquid, the multiple plat- ^ ten arrangement closed in the manner described, with for distribution of the activating agent and to ensure the necessary extensive contact between the various layers a pressure is exerted which also enables excess activation fluid to be removed. The activating agent is used to create an adhesive bond between the image layer and the receiving sheet as well as for swelling or otherwise softening and thus for reducing the cohesive force of the image substance composition. Furthermore, the active hair agent should be a have high resistivity, so that there is no electrical ' forms a conductive bridge from the image layer and in this way a weakening of the electric field during the exposure phase causes. That is why it is cheap to be commercially available To clean the activating agent and to do this, the one ConductivityMt to remove causing impurities. This can be done by passing the liquid through a clay filter or any other suitable cleaning procedures are carried out.

After the multi-plate assembly is made, an electrical Field generated on the image layer while using

009 885 / 09H BA _{ÖOR (G1NAL} _ _λ _.

exposed to an image pattern by means of electromagnetic radiation will. When the donor support is separated from the hydrophilic receiving sheet, the photosensitive layer breaks through along the the light pattern of the exposure determines the lines and the surface with which it adheres to the donor sheet or the receiver sheet. The separation of the elements is preferred however not necessary carried out with voltage applied. After the separation there are the exposed parts of the image material composition on one element, while the unexposed parts are held on the other, creating a positive image at the same time and a negative image was created. Whether the exposed parts remain on the donor sheet or on the receiving sheet depends on the light-sensitive substance used in the image layer and on the polarity of the material applied Field. The final image produced on the two surfaces can then either be automatically produced by evaporation of the volatile ones Constituents of the image composition or fixed by fixing the binder matrix by the action of external heat will. The separated hydrophilic receiving sheet with the viscous one Image is then used in a lithographic printing process.

Will be the lithographic master plate or the hydrophilic base not used as part of the multi-plate arrangement, various Types of procedure are used. In one embodiment of the method according to the invention, both can be on the donor pad and on the receiving sheet; generated images by printing theirs

0090 85/0911 - ¹ ^ ~

BATH ORIGINAL

The respective carrier can be transferred to the surface of a lithographic plate base. The intermittent multiple plate becomes brought into contact with the surface of a conventional lithographic plate base, for example a lithographic one Paper plate or a rough aluminum backing, and a pressure is exerted in-which the arrangement thus formed between two steel rollers is guided. The during the transfer step acting force is generally limited and determined by the particular lithographic plate base selected. If, for example, a lithographic paper plate is used, a pressure of approx. 14-1 kg / cm can act before a damaging one Effect on the mother disk itself occurs. The image is generally efficiently transferred within this range. at Another similar embodiment of the image transfer for making the lithographic plate is the multiple plate in flat contact with a lithographic plate base brought. By putting the image in a sticky state, e.g. by applying heat or a solvent vapor selectively transfer the hydrophobic image to a hydrophilic base. The experiences and limitations of this embodiment of the Process according to the invention are through the chosen substances for determines the individual elements.

In one embodiment of the method according to the invention for the production of a lithographic printing plate, that produced on the surface of the donor support or the receiver sheet is used positive or negative image due to the action of an activating liquid in a manner similar to that already

009885/0911 -

wrote reactivated. A lithographic pad is over placed the picture so that a second mech tray assembly is formed with the lithographic plate base as a receiving sheet serves. An electric field is generated at this arrangement. During the action of the electric field, the Image layer uniformly with electromagnetic radiation

than exposed. If the image of the receiving sheet / a Component of the second multiple plate assembly is used, so a polarity opposite to that of the initial imaging is chosen. Will be the donor pad with the picture is used, the polarity chosen will be that of the initial imaging. While maintaining the adjoining Stress is removed from the lithographic plate base The assembly peeled off, the image now adhering to the surface of the lithographic plate. The activation liquid can evaporate, and the image obtained is fixed, for example by the action of heat. This then results in an image of the Original image, which was generated by a light activated transfer on the lithographic plate base and the Allows production of a wide variety of prints.

The invention is described below with reference to the figures. Show it:

1 shows the section of a photosensitive manufactured according to the invention Plate arrangement,

FIG. 2 shows the section of another embodiment of one according to FIG Invention manufactured plate assembly,

Fig. 3 is a side section of a panel assembly for illustration the exposure and its effect on the light-sensitive Schüt,

009885/0911

- 15 -

Pig.4a and b a method for transferring the generated according to Fig.3 Image on the surface of a lithographic plate base and

FIG. 5 shows another embodiment of the transmission of the according to FIG Invention generated image on the surface of a lithographic ■ en Plattenurterlage ■ «

In Figure 1, a dispenser pad 11 and a photosensitive image material layer 12 is shown. This consists of a light-sensitive Λ Figmentstoff 13 dispergiert'ist in a binder matrix fourteenth Above the image layer 12 is a third layer, the receiver sheet 16. The entire arrangement is referred to as a flip-top plate arrangement. In the embodiment shown, the donor support 11 and the receiving sheet 16 are made of an electrically conductive material such as conductive cellophane, at least one surface being optically transparent in order to enable the layer 12 to be exposed.

The structure shown in FIG. 1 is one of the simplest forms of the multiple plate arrangement according to the invention, another and preferably used arrangement is shown in FIG. In this embodiment, a non-conductive dispenser support 21 is provided with an image layer 22 on its surface. As in FIG. 1, the image material layer can consist of one of the various compositions of matter already described. It is formed in the present case of photosensitive particles 23 in a Bindemittclma1; rix are diapergiert '24 "Above the image material layer is .sich the Ernpfangsblatt 26 _e The

00988b / Oy Π

The non-conductive donor support 21 is provided with a conductive electrode 25 on its rear side, while the receiving sheet 26 also has a conductive electrode 27.

3 shows the effect of a selective exposure of the in 2 with radiant energy, which is indicated by the lines 29. At the same time there is an electrical effect Field which is generated by the voltage source 30. By the properties of the image material layer or the matrix 22 breaks the layer along the lines determined by the electromagnetic radiation, as a result of which the plate arrangement is separated an image 32 is formed on the receiving sheet 26 while the complementary image 31 remains on the donor pad 21. If the receiving sheet is a lithographic plate base, for example a lithographic paper plate, the result is In this preferred embodiment of the method according to the invention, the mother plate is directly.

In Fig.4a is a lithographic plate base in the form of a Paper sheet 4-1 is placed on the image 32 present on the surface of the receiving sheet 26, which is represented by the image shown in FIG Exposure was created. Pressure is exerted on the arrangement shown by the pressure roller 4-2. Fig.4b shows the separation phase of the image transfer process in which the lithographic plate base 4-1 from the image -32 and the base 26 is peeled off, as a result of which a viscous oleophilic image is formed on the surface of the lithographic plate base 41 which forms the resulting printing plate made in accordance with the invention.

009 885/0911 -17-

5 shows the production according to the invention of a positive-positive lithographic printing plate through light activation. After the image "31" has been generated on the surface of the donor pad 21 (FIG. 3) the receiver sheet with its electrode removed from the assembly; and a second combination of a transfer electrode 51 and a lithographic plate base 53 instead used, so that the arrangement shown in Figure 5 results. During the action of a voltage of the voltage source 60 on the multi-plate arrangement thus formed becomes the surface the arrangement formed from electrode 25 and dispenser 21 uniformly illuminated with electromagnetic radiation passing through the lines 61 is indicated. When separated, the image is from the surface of the substrate 21 onto the surface of the substrate 53 transfer. The resulting lithographic printing plate consists of a viscous hydrophobic image 31 on the surface of a lithographic base 53 "which in the present case is made of paper consists.

Any suitable material can be used as a base for the according to the invention prepared lithographic printing plate can be used. The surface of the base is inherently hydrophilic and is such that it easily takes on a water-repellent image, which adheres firmly and is not peeled off by printing inks or not washed off by the flow solutions during the printing process will. Furthermore, the area of the base that does not belong to the image can easily be wetted with the flux solution and holds an aqueous film on its surface, which is not removed or dislodged by the lithographic ink can be. The document sheet can consist of any of the known for this purpose

009 885/0911 - 18 -

Fabrics are made of, for example, flexible waterproof paper, Plastic or thin metal foils. Typical metals are aluminum, steel, zinc, magnesium, chromium and copper.

Any suitable method can be used to carry out the method according to the invention Wetting or flow solution can be used. Typical such solutions contain one percent by volume of gum cellulose Water, gum arabic in water, glycerol in water, or isopropyl alcohol in water. Distilled water can also be used as a wetting solution. Other typical solutions are in U.S. Patent 3,110,169. You can have more Contains constituents, for example formaldehyde, and if glycerin is not present, it can be because of its hygroscopic nature Are added to nature and thus extend the period of time during which the surface of the lithographic Plate retains its hydrophilic properties. The addition of formaldehyde also has this effect. Hence be Flow solutions with glycerol or formaldehyde additives or mixtures thereof are preferably used, because the resulting lithographic Before use, the plate can be stored for a relatively long time compared to plates treated with other flow solutions. Gum arabic solutions are also very effective because the lithographic plates treated with them are hydrophilic Properties keep for a relatively long time after removal from the press, so that the respective printing plate without additional treatment can be reused with a flow solution.

Any suitable lithographic printing ink can be used to carry out the method of the invention. Typical such Colors and their properties are in "Ink Technology for

009885/0911

- 19 -

Printers and Students "by E.A. Apps, 1965, Part II, Chapter 11. The colors have the same basic structure as good letterpress inks, and they exist in their simplest form from a mixture of pigments, which is produced in a lithographic Varnish is dispersed, for example in thickened linseed oil. The lithographic oily ink is oleophilic and adheres to it hydrophobic image. It is made up of those who do not belong to the picture repelled hydrophilic surface parts.

Any suitable photosensitive material can be used in the implementation of the method according to the invention are used, its Selection largely on its photosensitivity and its Sensitivity spectrum as well as, accordingly, of the desired one Contrast of the final image, from the use of a heterogeneous or homogeneous arrangement and similar considerations. Typical photosensitive substances are: Substituted and unsubstituted phthalocyanine, quinacridone, zinc oxide, mercury sulfide, Algol yellow (CI. No. 67 500), cadmium sulfide, cadmium selenide, Indofast brilliant scarlet toner (CI. Ho. 71 140), Zinc sulfide, selenium, antimony sulfide, mercury oxide, indium trisulfide, Titanium dioxide, arsenic sulfide, Pb »0 ^ ,, galliurate triselenide, zinc cadmium sulfide, Lead iodide, lead selenide, lead sulfide, lead telluride, lead chromate, GaIlium telluride, mercury selenide and the iodides, SxI-fide, Selenides and tellurides of bismuth, aluminum and molybdenum. Finer the soluble "organic photosensitive substances (which facilitate the production of homogeneous arrangements) in particular more suitable for compositions with low proportions (up to approx. 5 #) Lewis Acids, Typical Such Organic Photosensitive

009 885 / 09-1.1 _ _2Q _

Pigments are 4,5-diphenylimidazolidinone; 4,5-diphenylimidazolidine ethione; 4,5-bis- (4'-aminophenyl) -imidasolidinone; 1,5-dicyanonaphthalene; 1,4-dicyanonaphthalene; Aminophthalonitrile; Nitrophthalidinfcril; 1,2,5,6-TBtraazacyclooctatetrain- (2.4 _i 6 _t 8); 3,4-di- (4 x -Ilethoxyphenyl) -7, e-diphenyl-i x ^, ^, e-tetraazacyclooctatetrain- (2,4,6,8); 3,4-di- (4'-phenoxyphenyl-7,8, diphenyl-1,2,5,6-tetraazacyclooctatetrain- (2,4,6,8); 3 » ^z '-» 7 »8- Tetramethoxy-1,2,5,6-tetraazacyclooctatetrain- (2,4,6,8); 2-mercaptobenzothiazole; 2-phenyl ~ 4-diphenyl-iden-oxazolone; 2-phenyl-4-p-methoxy-benzylidene- oxazolone; 6-hydroxy-2-phenyl-3- (p-dimethyl-aminophenyl) -benzofuran; 6-IIydroxy-2,3-di- (p-methoxyphenyl) -benzofuran; 2,3,5,6- tetra- (p-metlioxyphenyl) -furo- (3 »2f) -benzofuran; U- dimethylamino-benzylidene-benzhydrazide; ^ -dimethylaminobenzylideneisonicotinic acid hydrazide; furfurylidene- (2) - M '-dimethylaminobenzhydrazide; ^ -Benzilidene-amino-3-acenaphene -Benzylidene-amino-carbazole; (4-N, N-dimethylamino-benzylidene) -pN, N-dimethylaminoaniline; (2-nitro-benzylidene) -p-bromaniline; N, N-dimethyl ~ K * - (2-HItPO - ^ - cyano-benzylidene) -p-phenylene-diamine; 2,4-diphenyl-quinazoline; 2- (4-amino-phenyl) -4-phenyl-quinazonine; 2-phenyl-4- (4 ^l -di -methyl-aminophenyl) -7-niethoxy-quinazoline; 1,3-diphenyl-tetrahydroimidazole; 1,3-di (4'-chlorophenyl) -tetrahydroimidazole; 1,3-diphenyl-2 -4 · · -dimethylaminophenyl) -te trahydrodknidazole; 1,3-di- (p-tolyl) -2- / quinolyl- (2 '- ^ tetra-hydroimidazole; 3- (4'-dimethylaminophenyl) -5- (4 ⁿ -methoxyphenyl-6-phenyl-1 , 2,4-triazine; 3-pyridil (4 ') - 5- (4 ^{n-dimethyl-amino-phenyl)} -6-phenyl-1,2,4-triazinj 3, (4'-amino-phenyl) -5,6-di-phenyl-1,2,4-triazine; 2,5-bit £% aminophenyl- (1 '£ 7-1,3,4-triazon; 2,5-bisyrtP- (N -Ethyl-N-acetyl-amino) -amino) -phenyl- (1 ·) _7 ~ 1,3,4-triazole; Λ , 5-diphenyl-3-methyl-pyrazoline; 1,3,4,5-tetraphenyl -pyrazoline; 1-methyl-2- (3'4'-dihydroxy-methylene-

009 885/0911 _ ₂₁ _

phenyl) benzimidazole; 2- (4 '- «dimethylaminophenyl) benzoxaol; 2- (4 · metho3grphenyl) benzothiazole; 2,5-bis ~ ^ -aminophenyl - ("T) 17- ^/ 1» 3 »4-oxidiazole; 4,5-diphenylimidazolone; 3-aminocarbazole copolymers and mixtures of these substances. Any suitable Lewis acid (elec -

erjL. Tronenakceptor) can be brought into contact with many of the above soluble organic substances, as well as with many of the more insoluble ones, so that very substantial increases in photosensitivity occur. Typical Lewis acids are: 2,4-, 7-trinitro-9-fluorenone; 2,4,5,7-tetranitro-9-fluorenony picric acid; 1,3 »5-Ti" initrobenzolchloranilj benzoquinones 2,5-dichlorobenzoquinone5 2-6-dichlorobenzoquinone; ghloranil; naphthoquinone- (1,4) _} 25 3-dichloronaphthoquinone ¹ (1,4); anthraquinone; 2-methylanthraquinone; 1 , 4-dimethyl-anthraquinone; I-chloroanthraquinonej anthraquinone ^ -carboxylic acid; 1,5-dichloranthraquinone; i-chloro ^ -nitroaanthraquinone; pjienanthrenchinon; acenaphthenquinone; pyranthrenchinoia; anthraquinone-1,8-anthraquinone-1,8-anthraquinone; aldehyde; triphthaloylbenzene aldehydes such as bromal, 4-nitrobenzaldehyde; 2,6-di-chlorobenzaldehyde-2, xthoxy-1-naphthaldehyde 5 anthracene-9-aldehyde; pyrene-3-aldehyde; oxindol-3-aldehyde | pyridine- 2,6-dialdehyde, biphenyl-4-aldehyde; organic phosphorous acids such as 4-chloro-3-nitrobenzene-phosphorous acid j nitrophenols such as 4-nitrophenol and picric acid Tetrachlorophthalic anhydride, perylene-3,4 _? 9 »10-tetracarboxylic acid and nd Ch ^r 7'sen-2,3,8,9-tetracarboxylic anhydride, dibromomaleic anhydride · Metal halides of the metals and metalloids of groups IB, VII B, II A-VA and group VIII of the Periodic Table, e.g. ¹ aluminum chloride, zinc chloride, chlorine iron, tin tetrachloride (tin chloride), arsenic trichloride, tin chloride, antimony pentachloride, magnesium chloride,

0098 85/09 11

- 22 -

Magnesium bromide, potassium bromide, calcium iodide, strontium bromide, chromium bromide, manganese chloride, cobalt chloride, cobalt chloride, copper bromide, oxychloride, thorium chloride, arsenic triiodide, boron halogen compounds, for example boron trifluoride and boron trichloride; Ketones such as acetophenone, benzophenone, 2-acetylnaphthalene, benzil, benzoin, 5-benzoylacenaphthene, biacendione, 9-acetylanthracene, 9-benzoylantranene, 4- (4-dimethylamino-cinnamoyl) -1-acetylbenzene, acetoacetic anilide, , 3), - (iJ-Mketo-hydrinden), acenaphthenquinone dichloride, anioil, 2,2-pyridil, furil; Mineral acids such as the hydrogen halides, sulfuric acid and phosphoric acid; organic carboxylic acids such as acetic acid and their substitution products such as monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, phenylacetic acid and 6-methyl-coumarinyl acetic acid (4), maleic acid, cinnamic acid, benzoic acid, iC ^ -'-diethylaminobenaoyl) -boxy-benzene acid, phachthalic acid and tetralic acid, tetrasalic acid , alpha-beta-di-bromo-beta-formyl-acrylic acid (mucobromic acid), dibroin maleic acid, 2-bromobenzoic acid, gallic acid, 3 ~ nitro-2-hydroxyl-1-benzoic acid, 2-nitrophenoxyacetic acid, 2-nitrobenzoic acid, 3 ^x Nitrobenzoic acid, 4-nitrobenzoic acid, $ -nitro-4-ethoxybenzoic acid, 2-chloro-4-nibro-1-benzoic acid, 2-chloro-4-nitro-1-benzoic acid, 3-nitro-4-methoxybenzoic acid, 4- Nitro-1-methylbenzoic acid, 2-chloro-5-nitro-1-benzoic acid, 3-chloro-6-nitro-1-benzoic acid, 4-chloro-3-nitro-1-benzoic acid, 5-chloro-3-nitro- 2-hydroxybenzoic acid, 4-chloro-2-hydroxybenzoic acid, 2,4-dinitro-1-benzoic acid, 2-bromo-5-nitro-benzoic acid, 4-chlorophenylacetic acid, 2-chlorocinnamic acid, 2-oyano-cinnamic acid, 2,4 -Dichlorobenzoic acid, 3 »5-nitrobenzoic acid, 3t5-dinibrosalycylic acid, malonic acid, mucic acid, acetosalycylic acid, benzilic acid, butane-tetra-carboxylic acid,

009 885/0911 -23-

BATH ORIGINAL

Citric acid, cyanoacetic acid, cyclohexane dicarboxylic acid, cyclohexane carboxylic acid, 9 "10 ^ dichloro" -eteej'ic acid, fumaric acid, itaconic acid, Levulinic acid, (levular acid); A oleic acid, succinic acid, alpha-bromostearic acid, citraconic acid, dibromosuccinic acid, pyrene-2,5,7,8-tetra-carboxyic acid, Tartaric acid; organic sulfonic acids such as 4-toluenesulfonic acid, and benzenesulfonic acid, 2,4-dinitro-i-methylbenzene-6-sulfonic acid, 2,6-dinitro-1-hydroxybenzene-4-sulfonic acid and mixtures of these substances.

Further photosensitive compositions of matter can be formed ^ by combining one or more suitable Lewis acids with polymers that are not normally considered to be photosensitive Typical polymers that can be used for this purpose are: Polyethylene terephthalate, polyamides, polyinides, polycarbonates, polyacrylates, polymethylme! Acrylates, polyvinyl fluorides, polyvinyl chlorides, Polyvinyl acetate, polystyrene, styrene-butadiene copolymers, Polymethacrylates, silicone resins, chlorinated rubber and mixtures as well Copolymers of these substances, also thermosetting resins such as epoxy resins, phenoxy resins, phenols, epoxyphenol copolymers, epoxy-Iiarn- ι formaldehyde copolymers, epoxy-melamine-formaldehyde copolymers and their mixtures. Other typical resins are epoxy esters, vinyl epoxy resins, epoxy resins modified with tall oil and their mixtures.

• fce-For the hecological arrangement allows the photosensitive particles even from one or more of the aforementioned photosensitive Pigments of an organic or inorganic nature exist and with any suitable non-conductive resin in dispersion, solid solution or copolymerized be brought together, wherein the resin itself need not be photosensitive. The resin should die

009885/0911

Facilitate dispersion of the particles , avoid undesirable reactions between the binder and the photosensitive pigment or between the photosensitive pigment and the activating agent, and serve other similar purposes. Such resins are polyethylene, polypropylene, polyamides, polymethacrylates, polyacrylates, polyvinyl chlorides, polyvinyl acetates, polystyrene, polysiloxanes, chlorinated rubbers, polyacrylonitrile, epoxy resins, phenols, hydrocarbon resins and other natural resins such as rosin derivatives and mixtures and copolymers of these substances.

As already stated, the photosensitive image material layer should have a relatively low cohesive force as a coating after activation. Of course, this applies to homogeneous and heterogeneous arrangements. One method of realizing low cohesive force in the image layer is to use relatively soft, low molecular weight materials. For example, in a homogeneous layer composed of a single component, a monomeric compound or a low molecular weight polymer can be used together with a Lewis acid for high photosensitivity. Similarly, in the case of a homogeneous layer with two or more components in solid solution as a donor layer, one or both components can consist of a substance of low molecular weight, so that the layer has the desired low cohesive force. This can also be achieved in the production of a heterogeneous image material layer. The binder in the heterogeneous arrangement can be sensitive to light, but this is not necessary, so that substances such as microcrystalline wax, paraffin

009885/0911 - ² 5 -

BATH ORIGINAL

wax, low molecular weight polyethylene and others Low molecular weight polymers as binders solely based on their physical properties and their insulating properties Effect can be selected, and was regardless of their 'Sensitivity to light. This also applies to one of two components existing homogeneous arrangement in which not light-sensitive Substances with the desired physical properties can be used in solid solution with light-sensitive substances. Any other suitable method to achieve a low cohesive force in the image layer can also be used. For example, suitable mixtures can be incompatible Substances e.g. made of a polysiloxane resin with a polyacrylic ester resin are used either as a binder layer in a heterogeneous arrangement or in a homogeneous arrangement, in which the photosensitive substance either has one of the incompatible components together with a Lewis acid or is a special additional component of the layer.

It has already been stated that the donor pad and / or the Receipt sheet or its document can be conductive and this made of conductive cellophane. The use of such flexible, transparent conductive materials results mostly a relatively weak base. Therefore, a non-conductive donor pad and receiving sheet with a underlying electrode the use of solid, non-conductive polymers such as polyethylene, polypropylene, polyethylene terephthalate (Mylar), cellulose acetate, saran, a vinyl chloride-vinylidene chloride copolymer as well as similar substances. These types of solid polymers form

009885/09 11

det not only a strong pad for on the dispenser and images created on the receiver sheet of the multi-plate array but also created an electrical barrier between the electrodes and the image layer, which has electrical flashovers inside the arrangement avoids. When the lithographic printing plate is made directly, the receiving sheet is in the form of a hydrophilic base for forming a lithographic plate such as lithographic paper, rough aluminum, etc., as before was executed. Structural combinations of a multiple plate arrangement are more detailed in the French patent 1 478 172.

Any suitable activating agent can be used to carry out the invention Procedure are used. Generally speaking, it must consist of a solvent whose properties are described and that has the described effect on the image material or donor layer. Under the name "Solvent" should not only be understood here to mean substances that are referred to in the usual sense as solvents, but also those used as partial solvents, swelling agents, or emollients work for the image layer. The activation solutions should preferably have a relatively low boiling point have so that the fixation of the resulting image by solvent evaporation can take place in the event of very weak heat exposure. It should be noted, however, that the Invention is not limited to the use of these relatively volatile activating agents. It can also be non-volatile Activating agents with a very high boiling point are used,

009885/0911

for example silicone oils such as dimethylpolysiloxanes and long-chain aliphatic hydrocarbon oils, normally known as Transformer oils are used. Such an oil is, for example Wemco-G transformer oil from Westinghouse Electric Go., Which with good success in the method according to the invention was applied. In general, therefore, any suitable volatile or non-volatile solvent can be used as the activating agent will. Typical solvents are Sohio Odorless Solvent 3440, an aliphatic (kerosene) hydrocarbon component of the Standard Oil Co. of Ohio, carbon tetrachloride, petroleum ether, Bteon 2Ή (tetrafruortetrachloropropane), other halogenated hydrocarbons such as chloroform, methylene chloride, trichlorethylene, Perchlorethylene, chlorobenzene, trichloromonofluoromethane, tetrachlorodifluoroethane, Trichlorotrifluoroethane, amides such as formamide, dimethylformamide, esters such as ethyl acetate, isopropyl acetate, butyl acetate, Amyl acetate, cyclohexyl acetate, isobutyl propyanate and Butyl lactate, ethers such as diethyl ether, diisopropyl ether, dioxane, Tetrahydrofuran, ethylene glycol monoethyl ether, aromatic and aliphatic hydrocarbons such as benzene, toluene, xylene, hexane, Cyclohexane, gasoline, mineral spirits and white mineral oil, Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and Cyclohexanone and vegetable oils such as cocoa nut oil, bamboo bassu oil, Palm oil, olive oil, castor oil, peanut oil, neat fat and their Mixtures.

During the exposure phase, the multi-plate arrangement creates an electric field. Because the initial adhesion of the donor layer to the Speüder pad is only slightly stronger

0098 85/091 1
ORIGINAL BATHROOM - 28 -

if the donor layer is on the receiver sheet, the image layer remains on the donor base unless the combined effect of the exposure and the electric field supports the binding force of the receiver sheet and the donor sheet and thus exceeds the adhesive force between the donor sheet and the donor sheet. In this way, a reinforcing effect is achieved and the layer transfer can take place at relatively low exposure values. The electric field strength can be between about 39,000 and 985,000 volts / mm, preferably

she
is / approx. 59,000 to 79,000 V / mm. With some substances a preferred direction of polarization can be seen. For an image layer of finely divided metal-free phthalocyanine particles dispersed in a microcrystalline wax, it was also found that the best images are produced when the exposed electrode back of the donor pad is positive and the unexposed reverse side of the receiver sheet or the corresponding electrode is negative.

A source of visible light, ultraviolet light, or any other suitable activating electromagnetic radiation can be used to expose the multiple plate arrangement according to the invention. Better images are obtained with exposure from the donor side, and accordingly the receiver sheet is separated from the other layers of the multiple plate arrangement shortly after the image sealing with the voltage switched on.However, short delays in the separation after the exposure step have no detrimental effect on the images produced. In general, the same results are achieved when the sheets are separated

009885/0911

ORIGINAL INSPECTSD

The voltage is switched off. However, the pictures are then slightly worse. The exposure parameters such as the level of the switched on voltage etc. can be found in the French patent 1 478 172 mentioned.

If a relatively volatile activating agent is used, for example PetDDleumether Carbon tetrachloride or Freon 215 » so the fixation of the generated image occurs almost instantaneously on, since only a relatively small proportion of the activating liquid is still present. With slightly less volatile activating agents such as Sohio Odorless Solvent 344-0 or Freon 214 The fixation can be done by blowing air over the pictures or heating accelerated to a temperature of approx. 65 ° G, while they are even less volatile activators like E.g. transformer oil is achieved by a blotter effect, which is created with an additional contact surface. Except Any other known and suitable method can also be applied to the fixing methods described above.

The following examples serve to further illustrate the invention, the 3et $ JiM'- are not to be understood in a restrictive way. Unless otherwise stated, proportions and percentage values are based on weight. The examples make some preferential Execution of the method according to the invention.

Examples I and II.

A commercially available metal-free phthalocyanine is first made by Leaching in acetone to remove organic impurities purified. Because this step is a less sensitive crystalline

- 009 8 8 5/0011 " ^: ,

- 30 ORIGINAL INSPECTED

beta form, the desired alpha form is produced by dissolving 100 grams of the beta form in 600 ecm sulfuric acid, precipitating it in 3000 ecm ice water and neutralizing it with water. The obtained ^ purified alpha-phthalocyanine is ground for 6 days in a salt mill and desalinated in distilled water, vacuum filtered, washed with water and finally with methanol until the initial Filrat is clear and the x-form of phthalocyanine results. After vacuum drying to remove residual methanol, the x-form of the phthalocyanine is used to produce an image layer according to the following process j 2 grams of Paraflint RG, a microcrystalline wax from Moore and Munger Inc. with a melting point of approx. 101 ° C and 0, 5 grams of Sunoco 5825, a microcrystalline wax with a melting point of approx. 65 ° G, is a three-component mixture of 1.25 grams of the pure x-phthalocyanine, 0.8 grams of Watchung Red B, 1- (4 ^l -methyl) 5 ^l -hlorazobenzene-2'-sulfonic acid) -2-hydroxy-3-naphthenic acid, CI No. 15 865 »available from EI duPont de Nemours & Co., and 1.25 grams of Algol Yellow GC, 1,2,5,6-di (C, C ^t -diphenyl) -thiazole-anthraquinone, CI. No. 67,300 available from General Dyestuffs mixed in 60cc reagent petroleum ether. This preparation is placed in a glass vessel with a volume of 0.47 l with a large opening together with 0.24 l porcelain balls with a diameter of 1.27 cm. The lid of the jar is sealed with 0.13 "H * thick Teflon to prevent contamination. The lid is screwed onto the jar used as a ball mill container. The jar is covered with black pressure-sensitive vinyl tape, Type No. 33 from Minnesota Mining and Manufacturing Corp. to ensure protection against impact and its

009885/0911

- 31 - BAD ORIGINAL

Shield the contents from the light. The mixture is then milled at 90 revolutions per minute for about 24 hours. Thereafter another 20 ecm petroleum ether are added. The mill will then rotated for another 15 minutes. An even coating the resulting paste will be on top of a 0.05 now strong mylar films with a spreader stick No. 10 for education a donor sheet applied. The coating is at room temperature Air-dried for approx. 5 minutes. His strength will be ' measured at about 2.5 microns. The air-dried donor sheet is then placed on the electrically conductive sheet with the donor cover facing up Surface of a clear NESA glass electrode attached. Ga, 1ccm of a 5 5 ^ strength activation solution from Piccotex 100, a styrene copolymer, in Sohio Odorless Solvent J440 Standard Oil of Ohio's kerosene stake is along one edge of the horizontally arranged donor sheet. A second 0.05 mm thick mylar sheet is attached to the dispenser cover with the Activation solution applied, and the activation solution is Spread evenly over the dispenser by placing a 15 cm long rubber roller 2.5 cm in diameter once over the MjLar receiving sheet is rolled. A sheet of electrically 1-conductive black Paper, which serves as the opaque electrode, is placed over the second sheet of mylar. A voltage of approximately 10,000 volts will be is applied across a resistor of 1250 megohms to the transparent and opaque electrodes, with the positive pole on the NESA glass plate. Approx. 5 seconds after switching on the voltage, the multiple plate arrangement is exposed to a light image, while a negative continuously toned image through the transparent NESA electrode is projected through. the

009885 / 09H '- 32 -.

-ab- ORIGINAL INSPECTED χ

Exposure is approx. 0.54 I »ux with an incandescent lamp of approx. 2800 ° K for a duration of about 4 seconds, which is a total hitting Energy of approx. 2.16 Luxsec results. About $ seconds after exposure, the receiving sheet and the opaque electrode become removed by hand while the voltage of 10,000 volts remains on. After the separation is on the donor pad a copy of the original negative and a reversal or positive image on the receiving sheet. Both pictures will be by heating to a temperature of approx. 71 ° 0 with a hot Plate fixed. Each image is brought into contact with the top of a lithographic paper plate and at a speed of approx. 2.54 cm / sec between steel rollers of approx. 7.6 cm in diameter, which are clamped with a force of approx. 726 kg are passed through. The total force acting is approx.

becomes kg / cm. A reprint of an iEach picture / in this way on the

respective lithographic plate transferred. Each imaged lithographic printing plate is then converted into a conventional one lithographic printing press has been employed and has been successful using conventional flow solutions and lithographic inks used for printing.

Examples III and IV

The procedure described above is repeated until the receiver sheet is separated from the donor sheet. The one generated with the Imaged areas are under pressure in the manner described with a lithographic roughened aluminum plate in Brought into contact, and an imprint of the respective image is made transferred to this. The aluminum plates obtained meet the requirements of lithographic printing technology.

009885/0911

- Z> 0 - BAD ORIGINAL

Examples V and VI

A donor paste is produced in accordance with Examples I and II and a uniform coating of this paste is applied to a 0.05 mm thick Mylar base which is attached to a NESA electrode. The donor cover is activated with a 5 # solution of Piccotex 100 synthetic resin in Sohio 3440 in the manner described, after which a Mylar receiver sheet is placed over the activated donor sheet. The receiving sheet is backed with an opaque black conductive paper. After closing the multiple plate assembly, 7000 volts are connected to the electrodes through a 51 megohm resistor. As in Examples I and II, the NESA glass plate serves as the positive electrode, the opaque electrode as the negative electrode. Oa. 5 seconds after the voltage has been switched on, the arrangement is exposed to a light image by projecting a negative, continuously tinted image through the transparent NESA electrode. The exposure is approx. 0.54 Lux when a light bulb is switched on for approx. 5 seconds, which results in a total of approx. 2.7 Luxsec. About 3 seconds after exposure, the receiver sheet and the opaque electrode are peeled off by hand while the voltage remains on. After this separation, a negative image corresponding to the original image can be seen on the donor sheet and a reversal or a positive image on the receiving sheet. Both images are in turn fixed by heating to a temperature of about 7 "I ⁰ C. Each image is associated with a lithographic paper plate in Ββτ affecting, and an imprint of each image is by applying pressure as in Examples I and II to the surface of the respective paper plate

009885/0911

used in a conventional lithographic face and successfully used to perform prints using conventional flow solutions and lithographic inks.

Examples VII & VIII

The procedure described above in Examples V and VI continues until the receiving sheet is separated from the donor pad repeated. The documents provided with the images are printed with roughened lithographic aluminum plates similar to Examples I and II, and an impression of the respective image is made on the aluminum plates transferred, thereby yielding lithographic printing plates.

Examples IX and X

On the surface of a receiving sheet and a donor pad images are generated as in Examples I and II. After the separation and the fixation, the images are each in immediate Brought into contact with the surface of an aluminum lithographic plate. The multilayer assemblies obtained are to approx. 121 ° 0 for approx. 1 minute with a normal iron heated, whereby the e acting force is caused only by the weight of the iron. A copy of each picture is thereby transferred to the respective lithographic plate to form a printing plate.

Example XI

A donor paste is prepared according to the procedure of Examples I and II. An even coating of this paste is applied to the

BATH ORIGINAL

- ^ DuORiGlNAL

Surface of a 0.05 now thick Mylar film with a pick-up stick No.8 applied and at room temperature for about 5 minutes The thickness of the image layer is approx. 5 Measured microns. The air dried donor sheet is then coated face up on the electrically incapable surface attached to a transparent HESA glass electrode. An activation solution similar to that of Examples I and II is applied, and a 0.05 mm thick Mylar receiver sheet is applied to the Placed on top of the image material layer. On the Mylar receipt sheet is an opaque, conductive black paper electrode and completes the multi-plate assembly. A voltage of approx. 7000 volts is connected to the electrode arrangement via a 51 megohm resistor, the positive pole is on the HESA glass electrode. Ga. 5 seconds after When the voltage is switched on, the arrangement is shown with a photo exposed by a negative, continuously tinted image through clear NESA electronics projected through. the Exposure is about 0.5 ^ lux for 5 seconds, which is a total impacting energy of approx. 2.7 Luxsec results. Approx. 3 seconds After exposure, the receiving sheet is peeled off together with the opaque electrode by hand, whereby the voltage of 7000 ToIt remains switched on. After this separation is located an image is formed on the surface of the receiving sheet. This will fixed by heating with a hot plate to a temperature of approx. 71 ° C. A horizontally arranged lithographic Aluminum plate is connected to the negative pole of the voltage source. A thin layer of petroleum ether, which was also used to make the donor paste, is used as a coating on the surface applied to the aluminum plate, and the image of the receiving

009885/09 11

- 36 -

BATH

sheet is together with its backing and the opaque Electrode placed on the petroleum ether layer. The conductive opaque electrode is across a 51 megohm resistor connected to the positive pole of the voltage source. A voltage of approximately 7000 volts is applied to this multilayer arrangement turned on. After 5 seconds, the receiving sheet is peeled off together with the opaque electrode while the voltage of 7000 volts is still switched on. There is a viscous liquid on the surface of the lithographic aluminum base Image. The image is fixed on this by heating the plate to a temperature of approx. 135 ° 0, whereby a lithographic Pressure plate results.

Example ZII

Five grams of Sunocco 1290, a microcrystalline wax with a Melting point of about 71 ° C are made with a three-substance mixture 3 grams of metal-free x-phthalocyanine from Example I, two grams Watchung Red B and one gram of Benzidene Yellow 30-0535, available from Hilton Davis Corp., mixed in 100 cc petroleum ether, the is cleaned with a clay filter. This preparation is carried out at about 90 revolutions per minute for about 20 hours in a ball mill ground. The paste obtained is heated to a temperature of approx. 65 ° C. and then cooled to room temperature. A uniform coating of the fast is then applied to the surface of a 0.05 thick Mylar film with a no.6 spreading stick. brings about and results in an image coating about 2.5 microns thick. This is air-dried at room temperature for about 5 minutes. The thus obtained donor sheet then becomes as in the preceding Examples attached to a KESA glass electide, and the upper

009885/0911

flächte the donor layer is activated with Dow Corning Silicone 200, which has a viscosity of about 0.65 centistokes has "This material is applied along an edge of ^ö penderblattes. The donor sheet is covered with a lithographic aluminum plate and a rubber roll is passed over the exposed surface, thereby distributing the activating agent evenly over the donor sheet. A sheet of electrically conductive black paper is placed over the aluminum plate and serves as an opaque electrode. A voltage of approx. 3000 volts is connected to the electrode arrangement via a resistor of 51 megohms, with the NESA glass plate being positive and the black electrode being negative. Oa. An exposure is made 5 seconds after the voltage is switched on by projecting a negative continuously tinted image through the transparent NESA electrode behind the scenes. The exposure is about 1.03 lux for about 5 seconds. About 3 seconds after the exposure, the aluminum receiving sheet is peeled off together with the opaque electrode with the voltage switched on. An image can be observed on the surface of the lithographic aluminum plate. This is fixed on a hot plate by heating to a temperature of approx. 71 ° C. This embodiment shows the direct way of making a lithographic printing plate having an image on the surface of an aluminum lithographic plate base.

Example XIII

The procedure from Example ZII is repeated, instead of the Aluminum base a lithographic paper plate is used. The voltage switched on during the exposure is 4-000 volts,

00988570911. ₅₈ ._. BATH ORIGINAL

and the exposure produces an incident energy of about 2.7 Luxsec. On the surface of the lithographic paper plate, an image emerges which shows the use of the plate as ideal lithographic printing plate allows.

Example XIV

The procedure from Example XII is repeated with the difference, that the aluminum receiving plate is mounted on an aluminum roll of 10.2 cm in diameter and this arrangement over the activated donor layer when a voltage of 4000 volts and Exposure With an image being scrolled at about 3 * 6 Luxsec. The obtained aluminum lithographic plate is removed from the aluminum roll removed and used in a lithographic printing process.

Example XV

a donor preparation is carried out according to Examples I. and II and applied as a coating to the surface of a 0.05 mm thick Mylar film with a spreader stick Mo.10. The coating is air dried at room temperature for about 5 minutes. The received donor pad is with the cover after Mounted on top of an electrically conductive, clear NBSA glass electrode. The donor cover is activated with an activation solution as in Examples I and II, and one 0.076 mm strong lithographic aluminum foil is placed on top of the activated donor cover. The second aluminum plate is placed on the Aluminum sheet and serves as the second electrode of the arrangement. A voltage of approx. 4000 volts is applied across a resistor of 51 Megohm switched on, and there is an exposure with a photograph with the oa. 5.4 Luxseo. About 3 seconds after the exposure is made

009885/0911

- 39 -

BATH ORIGINAL

the aluminum receiving foil with its electrode peeled off by hand, while the voltage remains on. A viscous image is formed on the surface of the receiving sheet, and the plate thus obtained is used as a lithographic printing plate.

Example XVI

The procedure from Example IV is repeated, but instead of The aluminum receiver sheet used a lithographic paper plate. The obtained paper printing plate is used in a lithographic process.

Although the above examples have specific conditions and substances may contain those listed above in their place typical substances can be used with similar results. Except Further steps or changes can be introduced to the described process steps for making lithographic duplicating plates if desired. For example can be used during the heating of the dispenser paste and the cooling after grinding, but before applying the coating, the cooling step can be carried out in such a way that a shock effect on the Donor EU composition takes place. So this cooling step can either gradually or suddenly. Further Substances in the photosensitive material, binder, donor sheet, receiver sheet, or lithographic plate base exist) that have an improving, synergetic or otherwise show favorable effect on the properties of these substances for their use as described. For example, an increased image life and strength can be achieved through treatment with a

00.9885 / 0911; - 40 -

BATH ORIGINAL

Hardener or with a hard polymeric solution that wets the builder but not the base.

Further developments of the method according to the invention are possible for a person skilled in the art. These are totaled by the basic idea of Invention includes.

009 885/0911 °° ^PY

Claims (5)

1. Method of making a reproduction lithographic printing plate , characterized in that a layer (22) of a photosensitive image material between a donor support (2.1). and a receiving sheet (26) formed multi-faceted plate assembly at least one of their surfaces through with activating electro-magnetic Radiation is selectively exposed and at the same time exposed to an electric field, whereby the image material layer (22) breaks in a distribution corresponding to the radiation distribution, that the receiving sheet (26) separated from the multiple platen assembly is, wherein on the receiving sheet (26) and the donor support (21) mutually complementary images (32,31) remain, and that the final printing plate then either by the one with an image (32) provided hydrophilic receiving sheet (26) or by transferring a of the images (31,32) is formed on a hydrophilic base (41). 2. The method according to claim 1, characterized in that the exposure is carried out through the donor pad (21), and that a hydrophilic lithographic paper sheet is used as the receiving sheet (26). 3. The method according to claim 1, characterized in that at least one of the complementary images (31,32) on the surface of a hydrophilic Transfer substrate (53) by the action of external light (61) will. 4. The method according to claim 1, characterized in that at least one of the competitive images (31 »32) on the surface of a hydrophilic Base (41) is transferred by external pressure (42). 009 885/0911 _ _'42 _ . "copy 5. The method according to claim 1, daittreh gekenniehnet that at least one of the complementary images (31t 32) on the surface of a hydrophilic underlay is transferred by the action of heat. 6. Method according to one of Claims 3 and 5, characterized * that as a hydrophilic base (41 # 53) ice lithographiahee paper sheet is used. 07 · The method according to one of claims 1 to 6, characterized in that "i" image generation is applied to the light-sensitive image masking layer (2Z) . 8 "TerrielililtiTerfahren" u? Use of a according to one of the Ami samples 1 to 7 formed reproduction Sraok plate, that is known that on the surface of the plate a lithocrapohe Dmok- ^ faibe ia a te "on 4-plate rorfeandende image Appropriate distribution is applied, that the inked image area is brought into contact with a copy sheet, whereby a Image transfer to the copy sheet takes place, and that this should be repeated until the desired number τοη Kepiea BATH ORIGINAL 009885/0911