DE2031719A1 - Demolding process - Google Patents

Description

»Patent attorneys Dipl.-Ing. F. Weickmann, 2031719

Dipl.-Ing. H.Weickmann, Dipl. -Phys.Dr. K. Fincke Dipl.-Ing. F. ArWEICKMANN, Dipl.-Chem. B. Huber

8 MUNICH 86, DEN

PO Box 860 820

MÖHLSTRASSE 22, CALL NUMBER 48 3921/22

H / Kn Case Z.409

(XD / 1794)

Xerox Corporation, Rochester, N.Y., New York, USA Imaging process

The invention relates generally to imaging methods, in particular a method for producing images by transferring a layer in an image configuration, the method provides a reusable imaging layer.

The known imaging systems, for example xerographic vision and use photographic recording systems Materials which, once they have been used to produce a picture, are no longer used for further pictures can be. Although the modern xerography see procedure If a reusable photoconductor is used, the imaging material, i.e. the toner, must be replenished in the process as the amount of toner used to create an image is lost to the imaging system. The photographic method imaging has been used usefully, but is subject to similar limitations. For example can the photograph! see materials, such as the silver halide emulsions, Can only be used once and after a Image. · Has been created, they will be lost to the imaging system.

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Except for the irretrievable loss of image material With the * known imaging processes, the image development was also associated with complex and cumbersome, albeit automated, development techniques. In a form of xerography For example, developer containing toner is cascaded across the xerographic plate to develop the required image. The transfer of the toner onto a printing recording sheet or other substrate is required. This xerographic technique has proven to be excellent for reproducing typescript and other line-copy images, but the system remains too complicated because of the image development and transmission technology. The photographic method has its limits, there the PiIm from the imaging device, that is the camera, has to be removed and developed for the subsequent printing must become. The diffusion transfer type "instant camera" has its use in graphics, but image development remains expensive and dependent on many variables.

The continuous image prefilling is by various systems has been achieved, for example by the cathode ray tube in television technology and the light writer input and -registration, which is often used on the screen supports of electronic computers. However, such systems are very much expensive and require processing circuits that make the systems complex and expensive «

The British patent specification Mr ₀ 1 150 381 describes an imaging system which uses a copy sandwich "" which contains an electrically photosensitive material between a pair of poles. An imaging layer is produced for this area triangulation system, using a layer of electrically photosensitive Imaging material on a substrate. This coated substrate is called Boaor. If necessary, will

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the imaging layer made weakly cohesive. The procedural broker. The weakening of the imaging layer is called activation and in most cases it becomes the imaging layer Layer activated by being used with a swelling agent, solvent or a partial solvent for the imaging layer Bringing solvent into contact or achieving activation by heating. This step can of course be skipped if the layer retains sufficient residual solvent after they have been applied to the substrate from the solution or paste or is sufficiently weakly cohesive that it is in Reaction (speech) to the action of light and electricity Field breaks. After activation it becomes a receipt sheet (Receiving sheet) placed over the surface of the imaging layer. Then an electric field is applied to this copy sandwich while it is with a light and shadow motif is exposed that corresponds to the image to be reproduced. After the donor substrate or foil has been separated and the receiving sheet breaks along the imaging layer the lines created by the light and shadow motif with the the imaging layer has been exposed. A Part of the imaging layer is transferred to one of the sheets while the rest is retained on the other sheet, so that a positive image, i.e. a duplicate of the original, appears one sheet is produced while a negative image is produced on the other.

A replica imaging system has now been found which provides a reusable, electrically photosensitive imaging layer. There will also be a demonstration system created that is capable of continuous operation without that the supply of fresh imaging material is required.

The aim of the present invention is therefore to provide one Imaging system that eliminates the disadvantages mentioned above.

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«Β * L β»

The object of the invention is to create a layer transferring Imaging system which provides positive images of relatively high quality, the imaging material being used for manufacture further images can be made reusable »The invention also relates to a method for demonstration of negative or positive images using cheap and straightforward equipment.

These and other goals are achieved according to the invention by an imaging method in which a weakly cohesive (weakly cohesive), electrically photosensitive imaging layer is broken down into an image configuration and the separated parts of the imaging layer are brought together again after viewing the image. Proper treatment will recombine the imaging layer into a continuous layer that can be reused to produce additional images. As in the known reproductive imaging process, an electric field is applied to the duplicating sandwich arrangement and the imaging layer is exposed to electromagnetic radiation to which it is sensitive. After exposure to an image, the duplicating sandwich is separated, thereby decomposing the imaging layer into an image configuration and presenting it for viewing. After using the generated images, the imaging layer is reassembled by redesigning the duplicating sandwich, preferably in the exact image arrangement, and the sandwich is exposed to a second electric field which is of opposite polarity to the electric field used to generate the first image . While the second electric field is applied $ is the imaging _{layer totally exposed to electromagnetic radiation 9} to which the imaging layer is sensitive? whereupon the image layer is reunited (recombined) and is ready for the subsequent exposure to an image and the sandwich separation to produce another image. In those cases where the artwork is no longer weakly cohesive when reunited,.

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For example, when the image is fixed on the substrate, the image materials are made weakly cohesive by treatment with an activator , which will be explained in more detail below.

The method according to the invention can be used for generating individual images on cut sheets or it can be used to create images on a continuous belt or web. The use of a continuous The tape or web is particularly desirable in a continuous imaging system. This is a Donor web and a receiver web, between which a weak, cohesive, electro-photosensitive imaging layer in a sandwich arrangement mounted, guided between a series of rollers in a revolving arrangement, being along the trail various stages of operation are passed through, such as the electrical one Charging of the sandwich, exposure of the imaging layer with an image, the separation of the donor and receiver tracks, a demonstration section where the picture can be viewed, and a recombination stage in which the sandwich is re-formed, an electric field of reverse polarity is applied to the sandwich while the imaging layer is fully exposed to electromagnetic radiation, from where the re-formed sandwich to the image exposure station is returned. In each of the two systems, i.e. in the one with cut sheet or with continuous Web, the supply of fresh imaging material is not required, as that used to present an image Illustrative material entirely for use in the following Image production is recovered. With the aid of the copy layer transfer imaging process, a positive and a negative image are formed quickly and simultaneously, without the need for a separate development or image transfer step would be required. The positive or negative image can be

«Should therefore be considered immediately after the sandwich separation.

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In the copy layer transfer imaging process, the imaging layer comprises any suitable electrically photosensitive material. Typical organic materials include! Quinacridones such as: 2,9-dimethylquinacridonj 4,11-dimethylquinacridone; 2,1O-Diehlor-6,13-dihydro-quinacridone; 2,9-dimethoxy-6,13-dihydroquinacridone; 2,4,9,11-tetrachloro-quinacridone and solid solutions of quinaeridones and other compositions as described in US Pat. No. 3,160,510? Carboxamides, such as N-2 "-pyridyl-8,13-dioxdinaphtho- (2,1-2 ', 3') - furan» 6 ~ carboxamide; N-2 '- (1 ", 3 ^H, 5" -Triazyl -8 _J) 13-dioxodinaphtho- {2 ₉ 1-2 ¹ _$ 3 ') - furan-6-carboxamide; Anthra- (2,1) ~ naphthO "(2 _{! F} 3-d) -furan-95 H-dione-7- (12 ^l- methylphenyl) -carboxamidj carboxanilides ₉ like 8,13-dioxodinaphtho- (2, 1-2 ', 3') -furan-6-.carbox-p-methoxy-anilide | 8,13-M-

oxodinaphtho- (2,1-2 ', 3') - furan-6 ~ carbox-p-methylanilide;

8,13-Dioxodinaphtho- (2,1-2 ', 3') -furan "-6-carbox-p->cyanoanilide; triazines, such as 2,4-diamino-triazine; 2 ₉ 4-Μ- (1 ' -anthraquinonylamino) -6- (1 "~ pyrenyl) -triazine} 2,4-di- (I -anthraquinonylramino) -6- (1» -naphthyl) -triazine; 2,4-di- ^(t 1 - »napiithyl-amino) -6 ~ (1 '-perylenyl) triazine; 2,4,6 ~ tri- (l · "1% 1" ^l -pyrenyl) -triazine | 2 _f 4,6-tri- (' ^? ', 1 ", 1 ^IM -pyrenyl) -tria2sine? Benzopyrroeolines, such as 2,3-Pb.thaloy.L, -7,8-benzo-pyrrocoline; 1-cyano-2,3-'plithaloyl-7 «8-benzopyrrocoline; 1-Cya ^ ιo-2 _t-3 plltllaloyl-5-o-niti · 7 »8-ben2opyrroco- • lin; 1 -Cyano-2 , ^ -phthaloyl-S-acetainido- ?, 8-benzopyrrocoline; Anthraquinones such as 1,5-bis- (B-phenyläthylafflino) -anthraquinone; 1,5-bis- (3'-methoxypropylamino) ~ anthraquinone; 1,5-bis (benzyl * * * amino) anthraquinone; 1,5-bis (phenylbutylamino) anthraquinone | 1,2,5,6-di (c, c'-diphenyl) -triazolenthraquinone? 4-C 2'-HydroXyphenylmethoxyamino) -aathraquinone azo compounds such as 2,4,6-tris (li-ethyl-N-hydroxy-ethyl-p-aminophenylazo) -phloro-glucine; 1,3,5,7-Tetra-hydroxy-2,4,6,8-tetra (1-methyl-M-hydroxyethyl-p-aminophenylazo} »naphthalene; 1 ₁ 3 ₁ 5-2rihyaroxy-2,4 , 6-tri- (3 * -nitro-N-methyl-Hf-hyd & axymethyl ~ 4'-amino phenylazo) "benzene ι 3-methyl-phenyl-4- (3'-pysenylazo)" pyrazoline "5-" one 5 1 - (3 "-Pyrenylazo) -2-hydroxy-3-na? 'Iithanilid | 1 - (3' -Pyrenylazo) -2-naphthol | 1- (3 '-Pyrenylazo) -2" hydroxypyrene j 1 - C 3 '-pyr enjlazo ) -2 ~ hydroxy->

00S883 / 192S

3-methyl-xanthene; 2,4,6-tris- (3 ^L -pyrenylazo) -phloroglucini. 2,4,6-tris (1'-phenanthrenylazo) phloroglucine; T- (2 * -Methoxy-5 ^l -nitro-phenylazo) -2-hydroxy-3'-nitro-3-naphthanilidj salts and varnishes of compounds derived from 9-phenylxanthene, such as Phospiiotungframatomolybdänsäurelaek from 3,6-bis- (Ethylamino) -gjp'-carboxyphenyl-xanthenonium chloride; Barium salt of 3,2-toluidinamino-6,2 ⁿ -ine + .hyl-4 "~ sulfophenyl-amino-9,2"'-carboxyphenylxanthene; Phosphomolybdic acid varnish of 3,6-bis (ethylamino) -2,7 ~ dinethvl- 9,2'-carbethoxyphenylxanthenonium chloride; Dioxazine such as 2,9-MbBnZOyI-B, 13-dichloro-triphenodioxazine; 2,9-diacetyl-6,13-dichlorotiipheixodioxazinj 3 »10-dibenzoylamino-2,9-diisopropoxy-6 , 13-dichlorotriphenodioxazini 2,9-difuroyl-6,13-dichlorotripheno-fluorescei-nj / luminiumlaclc of 2.4» 5,7-tetrabromo-10,11,12-13-tetrachloro-fluorescein diazo compounds, such as N, N ^f -di ^ T- (1'-kaphi; hylazo) -2-hydroxy-8-naphthyl7-adlpdiamide; N, N'-di-1- (1 · - Naphthylazo) -2-hydroxy-8-naphthyl-8Uccindiaraidj bis -4,4 '- (2 · "-Hydroxy-8" -N, M'-dlterephthaloamide -1 -naphthylazo) -biphenylj 3,3'-methoxy-4,4'-diphenyl ~ bi8- (1 ^M -azo-2 ^M -hydroxy-3 "-naphthanilide); pyrenes, such as 1,316,8-tetra-cyanopyreni 1 , 3-dicyano-6,8-'dibromopyrene j 1,3,6,8-tetraaminopyrene? 1-cyano-6-nitropyrene j Phthalocyanines, such as metal-free phthalocyanine in the ß-Porm, copper phthalocyanine, tetrachlorophthalocyanine, the ⁿ x "- Porm of the metal-free phthalocyanine as described in US Pat. No. 3,357,989; Metal salts and lacquers from azo dyes, such as the calcium lacquer from 6-bromo-1- (1'-sulfo ^ -naphthylazo) -2-naphthol? the barium salt of 6-cyano-1- (1'-sulfo-2-naphthylazoV 2-naphthol; the calcium lake of 1- (2'-azonaphthalene-1'-sulfonic acid) -2-naphtholi the calcium lake of 1- (4 ' -X ^ yI-S ¹ -chlorazobenzene-2 ^f -sulfonic acid) -hydroxy-3-naphthoic acid; and mixtures thereof.

To typical electrically photosensitive inorganic compositions include cadmium sulfide, cadmium sulfoselenide, zinc oxide, zinc sulfide, sulfur, selenium, mercury II sulfide, lead oxide, Lead sulfide, cadmium selenide, (pitane dioxide, indium trioxide and the like.

00S883 / 1925

In addition to the organic materials mentioned above, other organic materials can also be used in the imaging layer including polyvinyl carbazole; 2,4'-bis (4,4'-diethylaminophenyl) -1,3f4-oxadiazole; If-isopropylearbazole and the like. Other electrically photosensitive materials useful in the method of the present invention are in British Patent No. 1,150,381.

The electrically photosensitive particles themselves can be composed of one or more of the above-mentioned suitable electrically photosensitive particles Materials, either organic or inorganic, comprised in a suitable insulating resin, whether the resin itself is photosensitive or not, are dispersed, are in solid solution therein or are copolymerized with it are. This particular type of particle may be particularly desirable in order to facilitate dispersion of the particles unwanted reactions between the binder and the photosensitive material or between the photosensitive Material and the activator are prevented and for similar purposes. Typical resins of this type include polyethylene, Polypropylene, polyamides, polymethacrylates, polyacrylates, polyvinyl chlorides, Polyvinyl acetates, polystyrene, polysiloxanes, chlorinated rubbers, polyvinyl pyrene, polyacrylonitrile, epoxies, Phenols, hydrocarbon resins and other natural resins, such as Resin derivatives and mixtures and copolymers thereof.

The ^M x ⁿ form of phthalocyanine is preferred because of its excellent photosensitivity, although any suitable phthalocyanine can be used to make the imaging layer of the present invention. The phthalocyanine used can be in a suitable crystal form. It can be substituted or unsubstituted both in the ring and in the straight-chain parts. For a detailed description of the phthalocyanines and their syntheses, reference is made to the monograph "Phthalocyanine Compounds" by PH Moser and AL Thomas, Reinhold Publishing Company, 1963 edition. As mentioned above, any suitable phthalocyanine can be used for the

009883/1925

Preparation - the photoconductive layer of the present invention, be used. Typical cyanines are given in British Patent No. 1,150,381.

The basic physical desired for the imaging layer Property is that of being fragile after manufacture or after suitable activation. That is, the shift must be so weak in structure that the application of an electrical Fe? .Des, combined with the action of actinic Radiation on the electrically photosensitive material, the imaging εckicht breaks. In addition, the layer must respond to the creation of a field whose strength is below the Field strength that causes electrical breakdown or arcing caused by the imaging layer. Another Term for "weakly cohesive" would therefore be "field fragile" be.

The imaging layer serves as a photosensitive element of the system as well as color material for the final image produced. Other coloring materials, such as dyes and pigments, can be used Image layer can be added to the color of the finished Intensify or modify images when color matters. Preferably, the imaging layer is selected so that it has a high sensitivity during at the same time it is intensely colored, so that an image with high contrast from the system of high quality in its gradation The imaging layer can be homogeneous and, for example, a solid solution of two or more pigments, one or more pigments being electrically photosensitive and at least one pigment is not electrically photosensitive. The illustration * layer can also be heterogeneous and contain, for example, pigment particles dispersed in a binder.

A technique to achieve weak cohesion in the masking layer consists in using relatively weak materials

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use low molecular weight in the layer. For example, a monomeric compound or a low molecular weight polymer complexed with a Lewis acid can therefore be used in a homogeneous one-component imaging layer in order to impart high photosensitivity to the layer. Even if a homogeneous layer that uses two or more components in solid solution is chosen for the construction of the imaging layer, either or both components of the solid solution can be a low molecular weight material, so that the layer has the desired low level possesses cohesive strength. This method can also be used in conjunction with the heterogeneous imaging layer. Although the binder material in the heterogeneous system can be photosensitive in itself, it does not have to have this property. The materials for use as a binder material can be selected solely on the basis of their physical properties without regard to their photosensitivity. This also applies to the homogeneous two-component system, in which photosensitive materials with the desired physical properties can be used * Any other technique can also be used to achieve weak cohesion in the imaging layer a polysiloxane resin with a polyacrylic ester, either as a binder layer in a heterogeneous system or in connection with a "homogeneous" system in which the photographic material can either be one of the incompatible components (complexed with a Lewis acid) or a separate and additional component of the layer can use Y / earth. The thickness of the imaging layer _s whether it be homogeneous or heterogeneous, is is the range of about 0.2 to about 10 yes yes, generally at about 0.5 / A to about 5 yu. and preferably at about 2 yu. .

The volume ratio of photosensitive pigment to binder im heterogeneous system can range from about 10 to 1 to about

009883/1925 ".

1 to 10, but it was generally found that the ratios in the range of about 1 to 4 Ms 2 to 1 the "best results." supply, accordingly this is a preferred range represent.

The binder material in the heterogeneous imaging layer or the in connection with the electrically photosensitive material in-the homogeneous layer material used can, if applicable, a contain suitable, weakly cohesive, insulating material or materials that can be made weakly cohesive. to typical materials include: microcrystalline waxes, such as Sunoco 1290, Sunoco 5825, Sunoco 985, all from Sun Oil Co. available; Paraflint RG, from the Moore and Munger Company; Paraffin waxes such as Sunoco 5512, Sunoco 3425 from Sun Oil Co .; Sohio Para wax from Standard Oil of Ohio; Hydrogenated oil waxes such as Capitol City 1380 wax from Capitol City Products Company, Columbus, Ohio; CasterWax L-2790, from Gaker Gaster Oil Co.j Vitikote L-304, from DuroCommodities; Polyethylene such as Eastman Epolene N-11, Eastman Epolene C-12, from Eastman Chemical Products Company; Polyethylene DYJT, Polyethylene DYLT, Polyethylene DYHP, Polyethylene DYDT, all of Union Carbide Corporation; Marlex TR 822, Mariex 1478, from the Phillips Petroleum Company; Epolene C-13, Epolene C-1O ^ by the Eastman Chemical Products Company; Polyethylene AC8, Polyethylene AC61 2, Polyethylene AC324, from Allied Chemicals; modified styrenes, such as rPiccotex 75, Piccotex 100, Piccotex 120, from Pennsylvania Industrial Chemical; Vinyl acetate-ethylene copolymers, such as Elvax Resin 210, Elvax Resin 310, Elvax Resin 420, from E.I. duPont de Nemours & Co., Inc .; Vistanex MH, Vistanex L-80, ex Enjay Chemical Co .; Vinyl chloride-vinyl acetate copolymers, like Vinylite VYLP, from the Union Carbide Corporation; Styrene-vinyltoluene copolymers; Polypropylene; and mixtures thereof. The use of an insulating binder is preferred as it involves the use of electrically photosensitive pigments from a larger area permitted. «

0P98 8 3/1925

A mixture of microcrystalline wax and polyethylene is preferred because it is weakly cohesive and acts as an insulator.

If the imaging layer is not sufficiently weakly cohesive to permit image fracture, it is desirable to use a To switch on the activation stage in the method according to the invention. Activation can take many forms, such as heating the imaging layer to soften it or applying it a substance on the surface of the imaging layer or the introduction of a substance into the imaging layer, wherein this substance lowers the cohesion of the layer or contributes to the lowering of the cohesion. The sub-dance used in this way is referred to as an "activator". The activator should preferably have a high specific resistance in order to to maintain an electric field in the electrically photosensitive layer of the copy sandwich. Accordingly it proves In general, the technical activator qualities are desirable cleaned to remove impurities that could lead to higher conductivity. This can be done by can be achieved by passing the liquids through a clay-earth column lets it run or another suitable cleaning technique is used at. Generally speaking, the activator can be made from any suitable material including those noted above Has properties «In the present description and in the claims, the term activator is not intended to be limited to materials Include those commonly referred to as solvents, but also those that are partial solvents are swelling agents or plasticizers for the imaging layer. The activator can be used at any point in the process prior to Separation of the copy sandwich can be applied.

It is generally preferred that the activator be a relative has a low boiling point, so the fixation of the resulting image is achieved with the evaporation of the activator can be. If desired, the fixation of the image can can be reached more quickly by usually gently warming. It is

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^0Ri ^ NAL INSPECTED

however, it is clear that the invention does not cover the use of this relatively limited to 'volatile activators'. Actually are non-volatile activators with a very high boiling point, ■ a. Finally, silicone oils, such as dimethyl-polysiloxane, and a lot high-boiling, long-chain aliphatic hydrocarbon oils, the commonly used as transformer oils, such as Wemco-C transformer oil by Westinghouse Electric Co., has also been used successfully in imaging processes. Even though do not dry off these less volatile activators by evaporation, image fixation can be achieved by doing the finished picture with an absorbent film, such as paper, contacted, which absorbs the activator liquid. In short, any suitable volatile or non-volatile activator can be used. Typical activators include Sohio Odorless Solvent 3440, an aliphatic hydrocarbon fraction (Kerosene) from the Standard Oil Go. of Ohio, carbon tetrachloride, Petroleum ether, ireon 214 (tetrafluorotetrachloropropane), other halogenated hydrocarbons such as chloroform, methylene chloride, Trichlorethylene, perchlorethylene, chlorobenzene, trichloromonofluoromethane, Tetrachlorodifluoroethane, trichlorotrifluoroethane, Ethers such as diethyl ether, diisopropyl ether, dioxane, tetrahydrofuran, Äthylengly.kol-monoäthyläther, aromatic and aliphatic Hydrocarbons such as benzene, toluene, jylene, hexane, Cyclohexane, mineral extracts and white mineral oil, vegetable oils such as coconut oil, babassu oil, palm oil, olive oil, castor oil, Peanut oil and nipple oil, decane, dodecan, and mixtures thereof. A deodorized mineral extract solvents, such as Sohio Odorless Solvent 3440, is preferred because it is odorless and non-toxic and has a relatively high flash point.

Another class of activators are the so-called ! 'Shermo-Solvents ". A thermo-solvent is a component in the electrically photosensitive imaging layer used in ordinary Room temperature is solid, but melts slightly above room temperature. This material is in the molten state a solvent or at least a partial solvent or Swelling agent for the imaging layer. Using a

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Thermo-solvent and heating of the copy sandwich makes the liquid the imaging layer weakly cohesive and enables it to tear sharply along the edges of the image motif with which the imaging layer was exposed. Usually, the thermo-solvent as a separate layer, but in contact with the electrically photosensitive imaging layer, the copying sandwich is incorporated. The thickness of the layer of thermo-solvent is usually in the range from about 3 to about 10 μ »

The thermal solvents useful for the process of the present invention are low-melting materials that are used in Are solid at room temperature and have a melting point below that of the material with the lowest melting point of the imaging layer.

Preferred thermal solvents are those at temperatures below Melting 79 C. Particularly good results are obtained with long-chain petroleum waxes with about 18 to about 30 carbon atoms in the chain. To typical low-melting point Y / axes include Octadecan, ITonadecan ,, Eicosan, Heneicosan, Doeosan, Tricosan, Tetr & sosan, pentacosan, hexacosan, heptacosan, octacosan, Nonacosan, triacontane and mixtures thereof. If desired, these low-melting waxes can be mixed with other materials, such as higher melting waxes. Typical thermal solvents which can be dispersed in a binder, or in the appropriate case used alone, close m-terphenyl, chlorinated terphenyl, perchlorocarbons, Polybutylenes, biphenyl, and mixtures thereof. The thermal solvents may be mixed with suitable binders, if desired, and may include binders which low-melting waxes mentioned above in connection with the binder materials of the A-forming layer.

Although the imaging layers are manufactured as self-supporting films these layers are normally applied to a film, the so-called donor film or the substrate. For the sake of simplicity, the combination of illustration

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layer and donor sheet referred to as donor. The electrically photosensitive Material can be added directly to a binder material and dispersed, for example by grinding in a ball mill or by heating the binder to a temperature above its melting point and dispersing the pigments in the liquid binder material by simply mixing them. After the components of the imaging layer have been mixed, the desired amount is applied to the substrate. In a special one Preferred form of the present invention is an imaging layer on a transparent, electrically insulating Donor foil applied.

The donor film and the recipient film can be any suitable one comprise electrically insulating or electrically conductive material. Insulating materials are preferred because they permit the use of a polymeric material of high strength. Typical insulating materials include polyethylene, polypropylene, polyethylene terephthalate, cellulose acetate, paper, plastic coated paper such as polyethylene coated paper, vinyl chloride-vinylidene chloride copolymers and mixtures thereof. Mylar (a stretched polyester film that is the condensation reaction between ethylene glycol and terephthalic acid manufactured by E.I. duPont de Nemours & Co., Inc.) is preferred because of its durability and excellent insulating property. Using this type of a high-strength polymer not only ensures a strong substrate for those formed on the donor substrate and the receiver sheet positive and negative images, but also represents an electrical barrier between the electrodes and the imaging layer, which contributes to the electrical breakdown of the system (breakdown) when the copy sandwich is exposed to the action of an electric field will. The donor sheet and the receiver sheet can each be made of consist of different materials. So can a copy sandwich can be made by using an insulating donor sheet while using a conductive material as a receiver sheet will. Preferably both the donor and the

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■ ' ^: - Λ ORIGINAL ^ i

Receiver foil under all temperature, humidity and stress conditions the mechanical handling during operation dimensionally stable. Either or both should be flexible to the separation and recombination along one To allow cylindrical surface and the shear forces and the inclusion of air in the photosensitive layer to a minimum keep.

Wi3 already mentioned above, according to the method according to the invention the imaging layer exposed to the action of an electric field. The electric field can be different Orphan has been created. In general, the sandwich is placed between electrodes with different electrical potentials. It can also apply an electric charge by any known method3 for introducing a static electrical charge into a material, before or after the formation of the sandwich; one of the Foils or both the donor and recipient foils are imposed. Static charges can be imposed by removing the Brings foil or the substrate with an electrically charged electrode in contact. Alternatively, either or both Films employing corona discharge devices such as those disclosed in U.S. Patents Nos. 2,588,699, 2,777,957 and 2 885 556, or by using conductive Rollers as described in U.S. Patent No. 2,980,834 or by heaters as in U.S. Patent No. 2,297,691, or charged by other suitable devices.

Thus, the electric field can be provided by means which are known in the art and which are used to subject an area to the action of an electric field. the Electrodes used can be any suitable conductive Comprise material and can be flexible or rigid. Typically conductive materials include metals such as aluminum, Brass, steel, copper, nickel, zinc etc., metallic coatings on plastic substrates, rubber by the inclusion a suitable material has been made conductive or

009883/1925

T. "'.' * ' ^R ■' *., - '.ΤίΧΓ Tt" TT.7 - "> · V ORIGINAL. INSPECTED

Paper that is conductive by the inclusion of a suitable material has been made or by conditioning in a humid atmosphere so that there is enough water in it, has been made conductive. Conductive rubber is due preferred for its flexibility. In the method according to the invention, in which the imaging layer is provided with an activating, electromagnetic Radiation is exposed while it is between electrodes, one of the electrodes must at least partially be transparent. The transparent, conductive electrode can of any suitable conductive, transparent material exist and can be flexible or rigid. Typical conductive, transparent materials include cellophane, conductive coated glass, such as tin or indium oxide coated glass, aluminum-coated glass or similar coatings on plastic substrates. NESA, a tin oxide coated glass from Pittsburgh Plate Glass Co., is preferred because it is a good conductor, is highly transparent, and is easily accessible. In the invention Process in which the donor or recipient is made of conductive material can also be used as one: the Electrodes are used through which the imaging layer is subjected to the action of an electric field. This means that when used as an electrode, the donor oil and the receiver film fulfills a double function in the method according to the invention.

The strength of the electric field applied to the Kapiersandwich depends on the structure of the copy sandwich and the materials used. If e.g. highly isolating receiver and Donor substrate materials used can be much higher Potential difference are applied than if relatively conductive donor and receiver foils are used. The required However, field strength can easily be determined. If too strong a potential is applied, the copy sandwich will break through and an arc is created between the electrodes. If a potential that is too weak is applied, the imaging client tears not in image configuration, for example, a 0.0762 mm (3 mil) Mylar receiver sheet and a 0.0508 mm (2 mil)

009883/1925

Mylar donor sheet is used so potentials can be up to 20,000 volts applied between the electrodes. However, the preferred field strengths across the copy sandwich are in the range of about 2000 volts per 0.0254 now (per mil) to about 7000 volts per 0.0254 mm (per mil) of electrically insulating material. Since relatively high potentials are applied, it is It is desirable to use a resistor in the circuit in order to limit the flow of current, 7 / i resistances in the order of magnitude from about 1 megohm to about 20,000 megohm are commonly used.

Whether the positive image on the donor foil or the receiver foil depends on the imaging layer materials used and the polarity of the applied field. Generally it was found, however, when the electrode on the donor side is at a positive potential relative to the electrode on the receiver side, is held, the positive image is formed on the donor sheet and a negative image is formed on the receiving sheet. That This means that the exposed parts of the imaging layer adhere to the receiving film and the non-exposed areas of the imaging layer adhere to the donor sheet. It was also generally found that when the imaging layer was applied to a donor sheet the best images will be produced when exposed through the donor sheet.

It can be a source of visible light, a TJ.V. light source or any other suitable source of electromagnetic radiation can be used to expose the imaging layer according to the invention. The electrically photosensitive material is chosen so that it responds to the wavelength of the electromagnetic radiation used. It is clear that different electrically photosensitive materials have different spectral response sensitivities and that the spectral Responsiveness of many electrically photosensitive materials can be modified by dye sensitization can, so daös either the spectral sensitivity of a material is increased or narrowed to a spade

009883/1925

-.19-. ■

or made wider to make it more panchromatic in sensitivity close. The required amount of electromagnetic radiation depends on the sensitivity of the used electrically photosensitive material. In general it is sufficient the exposure required to create an image during sandwich separation for plutlight exposure (total exposure) when the sandwich is reunited.

The advantages of this improved imaging method result from the detailed description of the present invention, especially when you see them in connection with the accompanying drawings.

Figure 1 is a side view. a cutaway image of a copy sandwich in performing the method steps of the present invention.

Figure 2 is a side view of a sectional view of a continuous, automatic imaging system that is a 'Copy sandwich used in the method according to the invention.

Now to FIG. 1: It shows the three essential working stages of the method according to the invention. Figure Ta shows a 'copier sandwich' between a pair of electrodes, one of which is transparent, to allow exposure of the imaging layer to the electromagnetic radiation of a photo is coated with an imaging layer 4 of electrically photosensitive material 6 dispersed in a weakly cohesive insulating binder 8. The imaging layer 4 can also be made weakly cohesive by using an activator or by heating if a thermo-solvent is contained in the sandwich be. About the imaging layer is the receiver sheet 10, which may be either transparent or opaque. an electric field '"wire by means of a pair of electrodes 12 and 14 applied across the Kopler- s andwich. The electrode 12 is a in this case

ÜD9883 / 1 92 5

BAD ORIGINAL COPY

transparent tin oxide coated glass commercially available under the trade name NESA. While useful, it is not necessary to use a transparent electrode to create an electric field. An electric field can be created by contacting the insulating donor sheet with devices that carry electric charges, such as a corotron. An image can then be exposed on the charged donor film and a receiver film can then be placed over the imaging layer. Then an electric field is built up across the ψ sandwich. The electrode 14 may be any suitable electrically conductive material ₉ and may be a conductive metal foil which is laminated to a film or the receiver film itself is electrically conductive, in those cases where the receiver = film. The electric field is provided by a potential source 16 which is connected to the switch 18 and the resistor 20. An electric field is thus applied to the copy set and the imaging layer is exposed to the light image 22 to be reproduced «

FIG. 1b shows the result of the separation of the copy sandwich under the action of an electric field, the imaging layer 4 tearing open in the image configuration _β The exposed parts of the imaging layer 4 adhere to the receiver sheet 10, while the unexposed parts of the imaging layer 4 adhere to the donor sheet 2 “By separating the sandwich, the imaging layer is broken down and the positive and negative images are laid out for viewing, and can be used for the intended purpose; after use, the donor sheet and the receiver sheet with their corresponding parts of the imaging material adhering to them are reunited as shown in Figure 1c. If necessary ₉ , the imaging material can be made weakly cohesive before the copier sandwich is reunited by acting on it with an activating liquid, vapor or heat. The receiver 10 is placed over the donor sheet 2, preferably in image alignment. This means that the © are preferably

009883/1925

The corresponding negative and positive parts of the picture are brought together. that the image material contacts the surface of the film opposite that to which it is adhered. Preferably even after the sandwich is reunited, the imaging layer is subjected to a force in order to remove trapped air and ensure good contact between ■■ the 'ponor and ■ receiver film with the imaging materials to ensure. This can be achieved by having

A roller, like a soft rubber roller, passes over the surface of the sandwich or subjects the sandwich to the action of ultrasound radiation. After the reunification of the sandwich, an electric field is built up across the sandwich, which has opposite polarity compared to the field used during the image exposure. As shown in FIG. 1c, the copy sandwich made of donor film 2, imaging layer 4 and receiver film 10 is subjected to the action of an electric field from energy source 16, with / switch 18 now in position B and providing opposite polarity, in comparison to the electric field that existed during the image exposure, as shown in FIG. 1a. Although the imaging layer can now be imagewise exposed to electromagnetic radiation while under this polarity, the images obtained are not of as good a quality as when the imaging layer is exposed to flood light at this stage. The imaging layer is therefore exposed to floodlight 24 under the action of the electric field. After exposure, usually equivalent in strength to that used in the brightest areas during the imaging stage, the electric field can be eliminated and the copier sandwich is ready for subsequent imaging, separation and recombination Fresh imaging material can therefore be used to produce numerous different images by the process according to the invention with the same imaging material. "

Turning now to Figure 2-, it shows an image demonstration system that follows the inventive method works. The procedure is as

009883/192 6

continuous cyclic process shown in eineaa such Prozess.umfassen the donor and the Empfängertsile Kopiersand- wieh preferably insulating or dielectric "materials ·, such as polystyrene, or polyethylene terephthalaty described Up. If leitfällige materials are used kontinuierliclieii _s ^ must cyclic system insulating barriers are used in each path _a 'zv the electric field / iselien the image · = exposure and reunification of Kopiersandmch interrupt. Figure 2 seigt a continuous band oü-st © ine path of the donor sheet, 202 _{g of} which the imaging layer 2Q £ with executes it. a continuous web or ribbon 2öS 1st a receiver which completes the copy sandwich ,, wdx ° oils electrodes 208 and 21 0 _f that are connected to. potential source 212, an electric field to the Kopiersandwieh. applied Although Figure 2 seigt _ß that the copy sandwich weäer with the electrode 208 or 210 in. Be Touch comes ₉ because the Boaorland receiver foils are preferably insulating "" materials, they can now touch one or both electrodes during the charging operation, _or the sandwich touches the electrodes, which as a Kikrang spatially separate them simdp to connect to weTMlt®n _a With the high potential used, the effective electrical contact is usually ensured by ionizing the air between the electrodes and the copier sandwich.

Alternatively kSnneia ai © Änfladimgselektorodea a dungsvorricatusig seia _g as in the US patent very if tea 2,777,957 and 2,836,725 h®sclm? I, sh®n _a instead of the electrodes 208 mad 210 a conductive pair of rollers can be used as an alternative a sharp edge or a bevel, as used by a Mife Pels Hberssogene orphan

Daa ¥ orzeicii @ n the ladraigj, as shown in dea Elektroieii 200 IRAM 210 ₉ can be raagekehrt Mieh ₉ ei © Elektrei.® 208 can be positive and dia Elekteod © 210 can negatiT gemaclif werd®a _ffl The charged KopierseadwieSi gskfe awissliea the Elekteoiem 208 and 210 through it, and transforms me Bslichtimgsstation 214 _S where © s with

00B883 / 1826

the light image 216 is exposed. The light image 216 can be generated are / by projecting light through a transparency or sound projects reflected light onto an opaque object. In continuous operation, the photo is pre-approved so Jureh projects a slit that little or no movement of importance between the projected light image and the copy sandwich takes place. Depending on the sensitivity of the used electrically photosensitive material3.s. k «mii the speed of the orbits in the range of 2.54 cm PO,; ·? approx per second (1 to 8 inches per second). The copy rs-andwieh goes in there via the orphan 218, then they go Different directions of the donor foil and the receiver foil apart. That is, the donor sheet 202 is over the roller The receiver film 206 is guided over the Y / alze 222 becomes * whereby the copy sandwich can separate and the image layer tears. As mentioned above, tears the imaging layer in image configuration, creating a negative image on one of the two films, the donor or receptor film, and a positive image is created on the other slide.

If necessary, one or both images can be fixed on their respective substrate, for example by means of Y / arms, as shown in FIG. 2 by the heater 224. Fixing the image at this point allows greater flexibility in the construction of the image presentation system so that the images can come into contact with whales and other devices without being damaged in the process. Systems constructed in this way can also be used "No contact with the image is required, eliminating the need to fix the image. The donor sheet, with the negative or positive image on it, proceeds to the image viewing station 226, which preferably has an illuminated background that is connected to the Incandescent light 227 is illuminated as. The image ¹ can be viewed directly or used as a transparent image in a projection device that can be attached to the index viewing station 226

00 9883/1925 _BAD ORIGINAL

System can be connected to separate drive devices or the rollers 220, 222, 228, 229 and the others can also be connected rollers shown serve as drive wheels.

It is clear that the demonstration system, as shown in FIG. 2, can be operated continuously or discontinuously. The generated image can therefore be viewed stationary at the imaging station 226, or it can be viewed while it is moving from the platen 220 to the platen 228. After passing the roller 228, the donor foil with the image is transported to a point at which it is brought into contact with the receiver foil 20G. The receiver film 206 moves from the roll 222 to the roll 230, take-up roll 232 and guide roll 234. The roll 232 can be loaded with a spring by attaching the spring 236 to the axis of the roll and thus ensuring the correct tension of the web . The roller 232 can be recessed so that only the edges of the web 206 are contacted by the roller. Preferably, contact between web 206 and roller 232 is limited to areas outside of the useful image. By lengthening the travel path of the receiver sheet 206, it is reunited with the donor sheet in approximate image correspondence so that the parts of the imaging material on the receiver sheet 206 touch the empty parts of the donor sheet 202. Before the llopiersandwich is reassembled, the correct physical properties are given to the imaging material by applying an activator to the imaging layer. Although the activator is applied in any suitable manner, such as with a brush , to an orphan who has a smooth or rough surface, can be applied by flow coating, by vapor condensation or the like, FIG. 2 schematically illustrates the application of activator liquid 238 by spraying onto the imaging layer 204 from the container 240. An activator was applied to one or both of the donor and receiver sheets in order to give the imaging material the correct physical properties before the copy sandwich is rebuilt. Alternatively, the sandwich can be permanent in one

009883/1925 bath

"activated" state can be kept by having a non-volatile Plasticizer is incorporated into the photoconductive layer 204. Another practical solution is to use it a closed chamber in which activating (plasticizers; Vapors. A reasonably good closure is also from the point of view of maintaining a dust-free operation desirable as the accumulation of dust naturally progresses the picture deteriorates. After an activator has been applied to the receiver film and the imaging material located on it has been, the receiver film, which is brought up via the roller 241, is brought into contact with the donor film 202. By electrodes 242 and 244, which are connected to a potential source 246 are connected, an electric field is established across the copy sandwich. In Figure 2, the polarity of the electric field is opposite to that which used during image exposure. Alternatively, the Electrodes 242 and 244 are replaced by idler rollers, the one Provide guidance for the copy sandwich and an electric field can be created by separate electrodes or conductive rollers or any other devices commonly used can be used to provide an electric field across the sandwich. After the formation of the sandwich and the application of a reversed field potential becomes the imaging layer exposed to flood light (electromagnetic radiation), shown in FIG. 2 as incandescent light source 248. The imaging layer 204 can be floodlit from either the donor or receiver side, after total exposure (Floodlight) the imaging layer in a subsequent Cycle of the system, whereby it is exposed to an image motif from electromagnetic radiation and by separating the copy sandwich, as already described above, is dismantled.

The following examples illustrate the present invention / even more precisely. The examples below are intended to provide various preferred embodiments of the improved imaging process explain without restricting it. If nothing

009883/1925

otherwise indicated, the parts and percentages represent parts by weight baw. Weight percentages

example 1

A commercially available metal-free phfchalozyanin is first purified by o- ^ ichlorbensolextraction to remove organic impurities zv. remove. Since this extraction leads to the less sensitive β-crystal form, the desired "x" porm hsr is produced by dissolving about 100 g of the i3 form in about 600 ecm of sulfuric acid, precipitating by dissolving the solution in about 3000 ecm .hJis - Pour water and wash with water until neutral. "The Ck -phthalocyanine purified in this way is then desalinated for 6 days with courtship milling and by slurrying in distilled water, filtered in a vacuum, washed with water and finally washed with methanol, until the initial filtrate is clear »After vacuum drying for. Removal of residual methanol, the "x" form of phthalocyanine thus produced is used to prepare the imaging layer by the following procedure; About 5 g of the "x" form of phthalocyanine are added, as shown below, about 5 g of Algol Yellow GC, 1.2 ₅ 5 »6-di (G ₉ C '» diphenyl) thiasol-anthraquinone, CI No. 67300, available from General Dyestuffs, and about 2.8 g of purified red B ^ 1- (4'-methyl-5'-chlorazo «benzene-2 ^l -sulphonic acid) -2-hydroxy-3-naphthoic acid _l C ₀ I ₀ No. ₃ 3 5865 available from E. I »duPont de Nemours & Co _35, which is cleaned as follows: About 240 g of Watchung Red B are mixed in about 2400 ml of Sohio Odorless Solvent 3440, a mixture of kerosene = fractic-ieri from the Standard 'Oil Company of Ohio, slurried on. The slurry is then heat it from about 65 ⁰ C to a temperature and held at this temperature for about 1/2 hour "The slurry is then filtered through a sintered glass filter. The Peststoffe then again with petroleum ether (90 to 12O ⁰ G) from Matheson, Goleman and Bell Division of the Mafcheson Company, East Riitherfordj, Mew Jersey? on ge sch lamb b and through a sintered glass filter filtered "■ The Fsstsubstanz getroclcne is then in an oven at about 50 ⁰ G _e fc

0 0 9 8 8 3/19 2 S bad original

About 8 β Sunoco Microcrystalline Wax Grade 5825 having an ASTM D-I27-Sehmelzpunkt of 66.2 ⁰ C (151 ⁰ P) and about 2g Parafllnt lt.- G., a paraffinic material having a low molecular weight, from Moore & Hunger Company, Hew York, and about 320 ml of petroleum ether (90 to 120 ⁰ C) 'to about 40 ml Sohio Odorless Solvent 3440 are added with the pigments in a glass vessel which 1.27 a (1/2 inch) Plintstcine contains · The mixture is then milled by rotating the glass vessel at about 70 rpm for about 16 hours. The mixture is then heated for about 2 hours at about 45 ° C, then allowed to cool to room temperature. The mixture is then ready to be applied to the donor substrate. The paste-like mixture is applied in dim green light to a 0.0508 mm (2 mil) Mylar film (a polyester obtained from the condensation reaction between ethylene glycol and terephthalic acid, from EI duPont de Nemours & Co., Inc.) tied with a wire to Mr. 36 is wound around as a pull-off rod to produce a layer thickness in the dried state of approximately 7 1/2 / u. The coating and 0.0508mm (2mil) mylar film are then dried in the dark at a temperature of about 33 ° C for 1/2 hour. A Mylar receptor film, also 0.0508 mm (2 mil) thick, is placed over the donor. The receiver film is lifted and the imaging layer is activated by applying a light mineral oil with a wide comb! Hairbrush saturated with oil. The receiver film is then allowed to sink back down and rolled over the closed copier sandwich with a roller using light pressure in order to remove excess solvent. The copier sandwich is placed donor side down on the tin oxide surface of a HESA glass plate and a black paper electrode is placed over the receiver. The electrodes are connected to a 9000 volt DC power supply in series with a 5500 megohm resistor, with the NESA glass being the positive electrode and the black opaque electrode being the negative electrode. When voltage is applied, a light image with white incandescent light is projected upwards through the HESA glass, with an illuminance of approximately 0.05 foot candles, which remain on for 5 seconds.

009883 / 192S

is turned and a total radiated energy of about 0.25 foot candles. times seconds. After exposure, the receiver film, together with the opaque electrode, is peeled off from the set with the potential source still connected. Upon separation, the imaging layer tears in an image configuration, yielding an image pair of excellent quality with a duplicate of the original on the donor film and a reversal or negative image on the recipient film. The receiver film is then placed back on top of the donor film and the imaging layer redistributed by manually running a nip roller over the receiver film with light pressure. The opaque electrode is placed back over the receiver film and the electrodes are connected to the power source using the reverse clamp arrangement compared to the clamp arrangement during exposure , at an illuminance of approximately 0.04 foot candles, for 5 seconds, total radiated energy 0.20 foot candles times seconds. After exposure, the electrodes are detached from the energy source and reconnected to the terminals, which are again connected in such a way that the NESA glass is again the positive electrode and the opaque black paper electrode is the negative electrode. With a potential of 9000 volts between the electrodes, the imaging layer is exposed as above with white incandescent light with a photographic object other than the one used above. After exposure, the receiver film is peeled off from the set together with the opaque electrode with the potential source still connected and results in an image pair of excellent quality with a duplicate of the original on the donor film and a reversal image "& original on the receiver film". '. This procedure is repeated 15 times' »in each case one obtains a bilfipaar _e

009883 / 192S BAD original

Examples 2 to 6

5 donor substrates are coated according to the method of Example 1 ', except that only phthalocyanine is used and the ratio of phthalocyanine pigment to binder material is 5: 1 in Example 2, 1: 4 in Example 3, 1: 5 in Example 4, 1: 5 in Example 5 and 1:10 in Example 6 is »If these donors according to the method of Example 1 are used add a picture and add a picture again, so create all a dense, high resolution image, except Example 6, which is a coating with lower reflective density and noticeably lower resolution.

Examples 7-11 . .

One prepares 5 donors according to the method of Example 1 and images them and provides them again with images according to the procedures described in that example, with the exception that the following activators are used in each example the. In example 7 the activator is Sohio Odorless Solvent 3440, example 8 is activated with carbon tetrachloride; Example 9 is activated with Freon 214 (tetrachlorotetrafluoropropane); example 10 is activated with Dow Corning Slicone Oil DC 200 (dimethylpolysiloxane) and example 11 is activated with a transformer oil (a very high-boiling, long-chain, aliphatic Oil from the Westinghouse Electric Company under the trade name Wemco-C) activated. In each of these examples, the activators are suitable and in imaging, sandwich recombination and re-exposure with an image they generate in the Separation of the copy sandwich ι high quality images. In the event of of Example 7 and Example 8 become the finished images slightly heated to dry off the activator and harden the image. In these examples, fresh activator is applied to the imaging material of each image is applied before the copy sandwich is recombined. In the case of Examples 10 and 11, the non-drying activator keeps the image in a damp state and the copy sandwich becomes without the addition of a fresh one Activator rebuilt,

009883/1925;

■ - 30 -

Example 12 .

An image material is produced ₉ by approx. 1 _? 5 parts of the "x" porin of phthalocyanine prepared in Example 1 and approximately 1.5 file of purified bensidine yellow (from the Hilton Davis Company of Cincinnati, Ohio, as Benz Yellow 30-0555) is incorporated into Bas Bensidine Yellow purified by the pigment in a mixture of 50 1.5 Mter fo isopropanol and 50 ° / o Sohio Odorless Solvent 3440 to be slurried. The slurry is heated to 75 ° C. and stirred for 1/2 hour. The mixture is then filtered and washed with isopropanol; then let them dry.

The pigment mixture is pre-ground as in Example 1, then a binder solution, prepared as in Example 1, is added to the pre-ground pigments. The materials are heated for about 2 hours at a temperature of 65 ° and then cooled to room temperature. About 60 ml of isopropanol are added to the mixture and the mixture is ground for about 30 minutes as in Example 1. The paste-like mixture is then prepared as in Example 1 applied to 0.0-62 mm thick (3 mil) mylar film and activated with a solution obtained by dissolving a chlorinated polyphenylene (from Monsanto Company, ₉ St. Louis Missouri, as Aroclor 5442) ± 500 ecm Sohio Odorless Solvent 3440 was prepared to form a 10 Grsw.fig solution. Man. provides a Kopier.saadiräcJi forth and exposing the imaging layer with an Mcntbild upon application of an electric field as in Example 1 »In the Auftrennimg the sandwich an image pair is generated ,, Beiror the activator ans the imaging material forming the image pair, evaporated _s is the Mehrfaohsandwich reunited _f an electric EEII opposite polarity exposed and exposed to floodlight. The image exposure with an applied electric field is repeated as above, whereby one receives another image pair of high quality with a different image object than in the first case © =

00S833 / 192S

BAD ORiGiNAL

Example 13

Han repeats the procedure of Example 1 with the exception, Clear cellophane film on the receiver film used Place of a .Kylar film. With the cellophane film you get the same "results as in Example 1, although the back. Deuiumgbrihgen the pictures over a large number of cycles is more inaccurate.

Bpispiul 14

The imaging material of Example 1 is applied to the polyethylene surface of a polyethylene-coated paper. After drying the Donorfum and the imaging layer iiiiter be subdued light sen between a pair of pass Elektrodenwal / ^ ¹ leads that are connected to a 10,000 volt DC power source. The charged donor is exposed to a light image from white incandescent light and the electrical charge is diverted from the donor by earthing. The donor film, along with an aluminum foil receiver film, is then placed between a pair of lietal electrodes in contact with the imaging layer. Before the receiver film is placed on the imaging layer, the imaging layer is activated with Sohio Odorless Solvent. 3440, The electrodes are connected to a 9000 volt DC power source with the donor side electrode made positive. When the potential is applied, the sandwich is separated and an image pair of excellent quality is obtained. .cattle recombined between the electrodes and a 9000 volt .potential applied between the electrodes, making the donor side electrode negative. The copy sandwich is then removed from between the electrodes after the system has been grounded. The multi-wall sheet is separated and the donor film with the imaging layer applied thereon is ready for use for final imaging, as described above, after the imaging layer has dried.

009883/1925

Example 15

First, an imaging layer is prepared which contains electrically photosensitive material dispersed in a binder. About 100 parts of "Naphthol Red B" that is. 1- (2 '~ Methoxy-5'-nitrophenylazo) -2 ~ hydroxy-3 "-nitro-3-naphthanilide, CI No. 12355" are dissolved in pure ethylenediainine. The solution is immediately filtered through coarse filter paper and the filtrate with The naphthol Red B precipitates in the alcohol and is separated off with the aid of a centrifuge. After the separation of the ethylene diamine and alcohol, the electrically photosensitive material is washed and filtered with successive amounts of isopropanol, a 2: 1 volume mixture of isopropanol and deionized water, and 5 washes with deionized V until the filtrate is / ater, neutral. Finally the material is washed successively with dimethylformamide and methanol until the filtrates have a pale yellow color. Then, the naphthol Red B at 4O ⁰ C is dried under vacuum .

A binder material is made by adding about 1.5 parts Paraflint RG, a low molecular weight paraffinic material from Moore & Munger Co., about 3 parts polyethylene DYLT from Union Carbide Corp .; about 0.5 part vinyl acetate-ethylene copolymer, available as Elvax 420 from EI duPont de Nemours Inc.; and about 2.5 parts of a modified polystyrene, available as Piccotex 100 from Pennsylvania Industrial Chemical Company, with about 15 parts Sohio Odorless Solvent 3440 combined. The mixture is heated until everything is dissolved and then cooled. About 45 parts of iopropyl alcohol are added and the mixture is ball milled for 15 minutes along with about 2.5 parts of Naphthol Red B. The resulting imaging material is then adjusted to 0.0762 mm (3 mil) thick Mylar film with a doctor blade applied to a 0.112 mm (4.4 mil) gap to make a donor. The donor is dried at a temperature of about 90 ⁰ C. After drying, the imaging layer will be with

009883/1925 ORIGINAL BATHROOM

Sohio Odorless Solvent 3440 activated and introduced into a copier sandwich as described in Example 1. The image layer is with a motif of white incandescent light as in the example 1 exposed. When the sandwich is split under an electric field, a pair of red-colored images becomes excellent Quality creates. The sandwich is reunited, an electric field of opposite polarity (compared to the first Field) exposed and totally exposed with white incandescent light as in Example 1, then images are generated by the sequence of activation and image exposure described above repeated under an electric field.

Example 16 .

The procedure of Example 1 is repeated except that 2.0 g of Icosane MW 282 / UH ₅ (CH ₂ ) ^ CE, 7, a high molecular weight aliphatic material from Eastman Kodak Co., is substituted for Paraflint RG. After applying to 0.0508 mm (2 mil) thick mylar film and drying for 1/2 hour at about 33 ° C, the coating is allowed to cool to room temperature. A receiver film of 0.0508 mm (2 mil) thick mylar film is placed over the coated donor and placed donor side down on the tin oxide surface of a NESA glass plate. A stream of hot air from a normal hair dryer is directed onto the sandwich and the NESA glass plate, which melts the icosan.

A paper electrode coated with soot-in binder is used placed over the receiver. The electrodes are in series with a 9000 volt DC power source at a 5500 megohm Resistance connected, with the NESA glass being the positive electrode and the black opaque electrode being the negative Electrode is. When voltage is applied, a light image with white incandescent lamp light is projected upwards through the NESA glass, with an illuminance of approx. 0.04 foot candles, 5 seconds • long, total irradiated energy approx. 0.2 foot candles times seconds. After exposure, the receiver film will be at

009883/1925 BAD

Any potential source that is still connected is deducted from the set. at the separation tears the image layer in the image configuration and results in a pair of images. by removing the heat supplied by the hair dryer. The recipient film is back on top of the donor film and the heat is supplied again with the hairdryer. During the heating, the layers are redistributed by adding a squeeze roller is passed over the receiver film with light hand pressure. The opaque electrode is then back is placed over the receiver film and the electrodes are connected to the power source with the clamps opposite the clamp assembly are swapped during exposure. Under the potential of about 9000 volts, the imaging layer becomes white Incandescent light with 0.2 puss candles times seconds totally exposed (floodlight). After exposure and continued heating the electrodes are removed from the energy source and reconnected to the terminals, which are connected in such a way that that they make the NESA electrode positive and the black, opaque paper electrode negative. With a potential of 9000 volts between the electrodes, the imaging layer is again exposed to an imaging object other than the original image. After the exposure is continued Heat the receiver foil together with the opaque electrode under 9000 volts from the Donor foil peeled off. A pair of images is obtained, with the donor carries the duplicate of the original and a reverse image is formed on the receiver film. This procedure can be repeated using the heating for activation.

Although specific components and proportions in the above description of the preferred embodiment of the present In accordance with the invention, other typical materials can, if appropriate, be used with similar success. In addition, other materials can also be added to the mixtures to achieve a synergistic effect, or to accelerate the properties of the imaging layer

009883/1925

BATH ORIGINAL

modify another way su. For example, different Dyes, spectral sensitizers or electrical sensitizers, how levic acids are added to the various layers,

The description herein will make others familiar to those skilled in the art Modifications and variations of the present invention suggested.

009883/1925

Claims (13)

- 36 claims Ί; Abbildimgsverfahren, characterized in that a) a sandwich is created that has a weakly coherent, contains electrically photosensitive imaging material sandwiched between a donor film and a ■ receiver film is located; b) the imaging layer is exposed to a motif of electromagnetic radiation to which it is sensitive while the imaging layer is under the action of an electric field; c) the sandwich under the action of an electric field is separated, v / o tears through the imaging layer in the configuration of the motif, the unexposed Part of the imaging layer adheres to one of the two films, the donor film or the receiver film, and the exposed one Part of the imaging layer adheres to the other film and; d) the sandwich is recombined and compared to a second electric field of opposite polarity with the polarity of the first electric field, while the imaging layer with electromagnetic Radiation to which it is sensitive is fully exposed. 2. The method according to claim 1, characterized in that steps b) to d) are repeated at least once. 3. Method according to claim 1 or 2, characterized in that that steps b) and c) are repeated after the implementation of step d) or the final step d) is repeated will. 009883/192 5 4. The method according to any one of claims 1 to 3 »characterized in that that the imaging layer is made weakly cohesive by applying an activator. 5 * Method according to one of claims 1 to 4 »characterized in that that the electrically photosensitive imaging layer is an organic, electrically photosensitive material contains. . 6. The method according to any one of claims 1 to 4 »characterized in that that the imaging layer contains an electrically photosensitive material in an insulating Binder is dispersed. 7. The method according to any one of claims 1 to 6, characterized in that at least one of the donor and receiver films is at least partially transparent and the imaging layer is exposed through the transparent layer. 8. The method according to any one of claims 1 to 7, characterized in that that the imaging material is activated before the sandwich is reunited. 9. The method according to any one of claims 1 to 7 »characterized in that at least one of the parts of the imaging layer is fixed on its substrate and then the fixed part before the reunion of the sandwich is activated. 1.0. The method according to any one of claims 1 to 9, characterized in that the imaging layer following the Reunion of the sandwich is moved. 11, method according to one of claims 1 to 10, characterized in that that the donor and receiver films are electrically * insulating and the electric field with the help of a static charge is created in each of the films. 009883/1925 12. The method according to claim 11, characterized in that the static charge with the aid of electrode rollers Films is awarded. 13. The method according to claim 11, characterized in that the static charge with the aid of at least one corona discharge device the film is awarded. 009883/1925 Jl Blank page