DE2004854A1 - Imaging process - Google Patents

Description

Patent attorneys Dipl.-Ing. F. ¥ eickmann, ~

D1PL.-ING. H. Weigkmann, Dipl.-Phys. Dr. K-FiNCKE Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 86, THE XMHA POST BOX 860 820

MÖHLSTRASSE 22, NUMBER 48 39 21/22

XEROX CORPORATION, Rochester, N.Y. 14603, V.StoA Imaging process The invention relates to an imaging method in which "

which is a tough-soft image layer that is electrically light-sensitive to an electromagnetic radiation used for its exposure, sandwiched between a donor and a recipient sheet, exposed to an electric field and at the same time the sandwich structure, door to break the image layer is separated in image-wise distribution

Such a method is used in the multilayer imaging technique which is based on the transfer of a layer of image a tough, soft, electrically photosensitive material, which is sandwiched between a pair of sheets j is. Under the influence of electromagnetic radiation, to which the image is sensitive, and an electrical field, the image breaks when the sandwich structure is separated while maintaining the electrical field in an imagewise distribution. In the most commonly used embodiments of this method, such a tough-white, electrically sensitive image material is applied to a base as a coating, which is referred to as a donor sheet. When exported unga form, the screen has one in a binder distributed light-sensitive material, such as metal-free © » Phthalocyanine on · case required, may be used to prepare

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During image production, the image layer can be activated by contact with a swelling agent, a solvent or a partial solvent for the image layer or else by heat. This process step is unnecessary.! if the layer is sufficiently remaining solvent has on the base of a paste out after its application or sufficiently tough _soft-f iet to a result of the electromagnetic radiation and the electric field to break. After activation, a receiver sheet is placed on the surface of the image layer. An electrical panel is then built up over the sandwich structure while it is exposed to a photo of the original to be reproduced.When the donor sheet is separated from the receiver sheet, the image layer blends along the lines defined by the exposure of the sheets is transferred, while the remaining part remains on the other sheet as a positive image and a duplicate of the original, so that a negative image is created on the first sheet.

In these previously known processes, the Sandwioh structure «· door placed on a translucent conductive electrode and a second conductive electrode over the receiver sheet ^ The translucent electrode usually consists of a ■ NESA glass plate and the electrode on the receiver sheet a conductive black flexible paper or aluminum foil These electrodes are then connected to a voltage source, creating an electric field across the sandwioh structure is set up · The electrical PeId is used during the Be11oh · » the screen with electromagnetic radiation maintain. Usually one of the electrodes is liohtdurohläesig, duroh which then the image is exposed to the light image to be reproduced. With the normal multi-layer fertilization methods at least one of the donor and recipient sheets is at least partially translucent, so that

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through this, which Biläsohich!;. can be exposed.

"" ■: - ;; r iS? -R--

These known methods produce high quality images and high image contrast, but have a number of disadvantages · For example was it .necessary to use the electric pId during the. Exposure of the image layer over the sandwich structure Maintain.-Therefore it became a translucent conductive Electrode used that was at least as large as the desired image, translucent electrode materials are used but expensive and fragile. In addition, at least one of the donor and recipient sheets were at least partially translucent compared to the electromagnetic beam used <f lung to adjust the exposure of the. sandwiched between them Allow image layer. The known imaging methods therefore use translucent parts and also require facilities for making an electrical Field above the sandwich structure near the point where the Image layer is exposed 0

The object of the invention is therefore to find a new imaging method to create that while maintaining the advantages of the known method no longer requires translucent parts and in which the exposure of the image layer prior to formation the sandwich structure is made «,

In an imaging method of the type mentioned at the beginning this object is achieved according to the invention in that the Screen is exposed before getting sick of the electric is suspended "

The image layer is again between a donation; and one Receiver sheet either before or after exposure of the image layer arranged, however, on each pail before applying one electric pelds. Haoh the construction of the electric field is separated oils sandwich structure. When "the separation breaks

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20Q4854

the image layer along the lines determined by the exposure, with part of the image layer being transferred to one of the sheets and the remainder remaining on the other sheet, so that a positive image as a duplicate of the original on one sheet and a negative image on the other If the image layer is placed between a donor and a receiver sheet before exposure to form a sandwich structure, at least one of the donor and receiver sheets must be at least partially transparent to the electromagnetic radiation used. If, however, the exposure prior to the formation of the sandwich structure ψ made, so it is not necessary that one of the sheets against the radiation used is translucent ·

So far, the image layer is during the application of an electrical Exposed over the sandwich structure. The electric field is generated via conductive electrodes or as an electrostatic Charge built up on the surface of the insulating donor and receiver sheets that are in contact with the image layer It has now been found, however, that Bildsohiohten produced which do not require simultaneous exposure and application of an electric field the intermediate exposure - the image layer and the application of the electric field depends on the electrical sensitivity of the image layer, the intensity of exposure and the strength of the electric field

The property of electrically photosensitive material particles of an image layer for the Mehrsohiohtenteohnik, which the development of the image by separating the sandwich structure under an electric field after exposure is possible referred to as aging. This property can easily be recognized from the device shown in FIG. 2, later on is described in more detail · Usually such a Versuoh runs

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in the following way abs on an insulating pad or A donor sheet becomes an electrically photosensitive one Image layer applied and exposed to a light image of electromagnetic radiation to which the layer is sensitive. The exposure is canceled, then and a Receiver sheet-arranged on the image layer. After education This sandwich structure becomes the donor and recipient sheet charged. When the structure is separated, the image breaks in an image-wise distribution, with part of the layer transferred to the receiver sheet and the remaining image sole remains on the donor sheet. You possible length of time between j the termination of the exposure and the charging of the sandwich »- ™ Structure is referred to as the aging properties of the particular image layer used. The aging property of a specific image layer can be determined under different working conditions, e.g. by changing the exposure level and the strength of the electrical field overlying the sandwich structure. In addition, the aging properties of some electrically photosensitive substances can be reduced by one after the other Imagewise exposure and port of charge applied electromagnetic radiation are affected · In this way the possible length of time between exposure and charging can be reduced when general lighting such as e.g. Daylight, port of the charge-admitted. {

The time elapsing between exposure and charging can be Sound can be a few hundredths of a second up to hours · Door electrically light-sensitive substances with very short aging properties is the · example shown in Pig.2 like this to modify that the ■ wipe exposure, sandwiching and charging time can be made as short as possible

For the execution of the images created according to the invention, all suitable electrically light-sensitive substances can be used that

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This applies regardless of whether the particular substance is organic, inorganic, made up of one or more components in solid solution or distributed in one another, the particles are combined from several layers of different substances or from light-sensitive and non-light-sensitive substances. Strongly colored, electrically light-sensitive substances have substances such as 8 _f 13-SioxodixLaphtho- (1,2,2 ', 3') - furan-6-oarbox-p-methoxyanilide; Locarno Red, CI No · 15865, 1 - (4'-Methy1-5'-chlorazobenzol-2 ^J-sulfonic acid) hydroxy-3-naphthoic acid; Watchung Bed B, the barium salt of 1- (4'-Methy1-5'-chlorazobenzene-2-sulfonic acid) -hydroxy-3-naphtholic acid, OI No. 15865, naphthol Red B, 1- (2'-methoxy-5'-nitrophenylazo) -2-hydroxy-3 "-nitro-3-naphthanilide, C · I · No. 12355j Duol Carmine, the calcium base of 1- (4 '-Methyl azobenzene-2 ^! -Eulfonic acid) -2-hydroxy-3-naphtholic acid, CI No. 15850; Calcium Idthol Red, the calcium base of 1- (2 ^I -azonaphthalene-1 * sulfonic acid) ~ 2-naphthol, CI No 15630; Pyranthrone Indofast Brilliant Scarlet Toner, 3,4,9,10-bis (N, N * - (p-methoxy-phenyl) -imido) -perylene, 0 · Ι. Ιίο.71140; Dichlorthioindigo; Pyrazolone Red B Toner , CI * Vo. 21120; Methyl Violet, a phosphorus-tungsten-molybdenum acid base of a triphenylmethane dye, CI. 42535 | Indofast Violet-Base, Diohlor-9,18-isoviolanthronj CI. No. 6001Oj Diane Blue, 3 »3 '-Methoxy-4,4 ^l -diphenyl-bie <1 ^M -azo ~ 2 ^l -hydroxy-3 ^l -naphthanilide, CI · No. 21180; Indanthrene Brilliant Orange RK, 4,10-dibromo-6 _# 12-anthanthron , CI. No. 5930Of Algol Yellow GC, 1,2,5 _t 6-di (C, O ¹ -diphenyl) -thiazol-anthraquinone, CI, No. 67300; Flavanthrone; Indofaet Orange Toner, CI, No. 71105; 1-cyan-2,3-pht haloyl-7,8-benaopyrroeolin and many more thioindigos, aoetoaoetarylides, anthraquinones, perinones, perylenes, dioxazines; Ohinaoridones, azo and diazo compounds, thoazines, azines and similar substances.

Type β ο he inorganic compounds are cadmium sulfide, CadalUHSulfoeelenld, Zinc oxide, zinc sulphide, sulfur soils, mercury • silver sulphide, Lead oxide, lead sulfide, cadmium soul, titanium "

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dioxide, indium trioxide and similar

In addition to the aforementioned organic compounds, other organic substances may be used in the image layer, such as Polyvinylcarbazolj 2 _t 4-bis (4,4'-I> iäthyl-aminophenyl) _-1-t 3,4 oxidiazole | .H-isopropylcarbazole; Polyvinyl anthraben; Triphenylpyrrole; 4 »5-IDiphenyliinidazolidinone; 4,5-diphenylimidazolidine ethione; _4> 5-his (4 ^t -Ainino-phenyl) -imidazoliainon; 1, 2.5 $ 6-Tetraazaeyclo-octäte-fcrain - (2, 4 * 6,8); 3,4-di- (4 'methoxyphenyl) -7,8-diphenyl -1,2,5 » 6-tetraazacyclooctatetrain- (2 _f 4,6 _> 8); 3,4 ~ di (4 ^l -phenoxyphenyl) -7,8-diphenyl- J

1,2,5,6-tetraaza-cycluoctatetrain- (2.4 _t 6.8); 3,4 »7,8-Tetra- 'metho? Y-1,2,5,6-tetraaza-cyclooctatetrain- (2,4,6,8) -2-mercaptobenzthiazoli 2-phenyl-4-alpha-naphthylidene- oxazolone ;. 2-phenyl-4-phenylidene-oxazolone; 2-phenyl «4-p-methoxybenzylidene-oiazolon; 6-hydroxy-2-phenyl- (p-dimethyl-aminophenyl) -benzofuran; 6-hydroxy-2,3-di- (p-metho3-phenyl) -benzofuran; 2.3 1 5 »6-tetra- (p-ynethoxj-phenyl) -furo (3.2f) -benzofurane; 4'-dimethyl-amine-benayxiden-bensliydrazide;4> -Ι) ΐηιβthylaminobenzylideniaonicotinsäurehydrazid; For uirylidene- (2) -4'-dimethylamino-benzhydrazide j 5-benzylideneii-aminoaoenaphthen ~ 3-benzylidene-aminooarbazole; (4-N, Nl) imethylaniinobenzylidene) -pN, N-dimethylaminoaniline} (2-nitro-benzylidene) -p-bromoaniline; H, N-r-dimethyl-N ¹ (2-nitro-4-cyano-benzylidene) p-phenylene-diamine; (2,4-Biphenyl-chiiiazolin} 2- (4 ^f -AiBinophenyl) -4-phenyl-quinazoline; ^ -Phenyl ^ - (4 ^f -dimethyl-aainophenyl) -7-methoxy-ohinazoline; 1,3-Dipheny1- tetra-hydroiaidaeolj 1,3-di- (4'-chlorophenyl) -tetra-hydroimidazole; 1 _f 3-ai- (p-tolyl) -2- / 0hinolyl- (2 »-) 7 tetra-hydroimidazole; 3- (4 ^l Oimethylaminophenyl) -5- (4 ^M -methoxyphenyl) -6-phenyl-1,2 _t 4-triazine; 3-pyridil- (4 ') - 5- (4 ^t dimethyl ^ aminophenyl) -6-phenyl- 1,2,4-triazine; 3- (4 ^l -aminophenyl) -5,6-diphenyl-1,2,4-triazine 2,5-bia £ K -aminopheny1- (1) / -1f 3 '3 ~ triaioli 2,5-bis / 4' - (N-ethyl-N-aoftyl-amino) -phenyl- ^(4: 1) J \ f 3,4-triazol ^fi-1, S- Biphenyl ^ HDiethyl-pyrazolini 1,3-4,5-tetra-phenyl-pyrazoline; 1-phenyl-3- (p-methoxyBtyryl) - '5- (p-

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methoxyphenyl) pyrazoline 1-methyl-2- (3 ', 4 ^! dihydroxymethylene-phenyl) -benzimidazole; 2, (4'-dimethylaminophenyl) benzoxazole j 2- (4 ^l methoxyphenyl) benzthiazole; 2,5-bis / p-amino-phenyΙΟ I / 1,3t4-oxidia2! Ol; 4,5-diphenylimidazolone; 3-Amino-carbazole as well as copolymers and mixtures of these substances

Other substances are, for example, organic donor-acceptor (Lewis acid Lewis base) complex substances formed with charge transfer from donor resins such as phenol aldehyde resins, phenoxy resins, Epoxy resins, polycarbonates, urethanes, styrenes or similar, complexed with metal electron acceptors, such as 2,4,7-trinitro-9 ~ fluorenonj 2,4 "5-7-tetranitro" 9-fluorenonj pioric acid; 1,3,5-irinitrobenzene; Ohloranil; 2,5-Diohlor-benzoquinonj Anthraquinone-2-carboxylic acid, 4-l-nitro-phenol; Maleic anhydride; Metal halides of metals and metalloids of groups I-B and II-VIII of the periodic table, e.g. Aluminum chlorides zinc chloride, iron chloride, magnesium chloride, calcium godide, strontium bromide, chromium bromide, arsenic triiodide, Magnesium bromide, stannous chloride, boron halides such as boron trifluoride; Ketones such as benzophenone and anisil, mineral acids such as sulfuric acid; organic carboxy acids such as acetic acid and Maleic acid, succinic acid, citraconic acid, sulfonic acid like 4-toluenesulfonic acid and mixtures of these substances. Additionally Many of the other substances mentioned above can be further sensitized to these substances by the formation of charge transfer complexes in addition, many can be made sensitive to color, narrower by their spectral sensitivity range, to make wider or higher

Naphthanilides are popular because of their excellent aging properties preferred For the preparation of the picture suspension used according to the invention, any suitable Naphthanilide are used · Particular preference is given to naphthanilides which are koaplexverbuadene with electron acceptors. * Trinitro-9-fluorenone are particularly preferred electron acceptos «·

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■ - 9 - '. ■■ \

ren, any suitable crystalline form "can be used.

Typical naphthanilides are ζ · ΒΥ 1- (2 ^f -methoxy-S'-nitrophenylazo) -2-hydroxy-3 "-nitro-3-naphthanilide, 1 - (2 · -chloro-4 '-nitrophenylazo) -3 "-nitro-3-naphthanilide, 1 - (3 ', 5'-dinitrophenylazo) -" 2-chloro-3 "-naphthanilide, 1- (3.5 ^l -3imethoxyphenylazo)" 2-hydroxy-3 "-nitro- 3-naphthanilide and mixtures of these substances.

In addition, the electrically photosensitive particles themselves can be composed of any suitable one or more of the above named electrically light-sensitive substances of organic -, or of an inorganic nature, distributed in a suitable insulating resin, in solid solution with this or are copolymerized with it, regardless of whether the resin itself is photosensitive or not · This particular part · - » Chenart can be particularly desirable to facilitate the distribution of the particles in order to avoid undesired reaction between Binder and light-sensitive material or between light-sensitive and activating substance to prevent or to perform similar tasks. Typical resins are of this type e.g. polyethylene, polypropylene, polyamides »Polymethacrylate, Polyacrylates, polyvinyl chlorides, polyvinyl acetates, polystyrene, Polysiloxanes, chlorinated rubbers, polyacrylonitrile, epoxy resins, Phenolic resins, hydrocarbon resins and other natural resins ohe resins, such as rosin derivatives, as well as mixtures and Copolymers from them · ^

The desired physical properties of the image layer consists in the fact that it is breakable after its production or after suitable activation structurally enough to be soft when applied an electric PeIdβ combined with an electromagnetic one Radiation on the elektrisoh light-sensitive substances breaks, Weitirhln the Bildsohioht already on a field strength praise that is smaller than the one with the elec-

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Electric breakdowns or arcs occur over the image surface. Another term for ^R tough weieh ^M is therefore "under field exposure breakable ¹¹ · The image layer does not need to be tough-soft right from their exposure, but, by appropriate treatment, such as activation, before the separation of the charged sandwich structure be made tough and soft.

The image layers act both as a light-sensitive element and as a color source for the final image. wisely, the image layer is selected to have a high degree of sensitivity and, at the same time, an intense coloration so that an image has high contrasts due to the high G-amma value can be obtained with the method according to the invention The image layer can be homogeneous, for example containing a solid solution of two or more pigments. The image layer but can also be heterogeneous if, for example, it has pigment substances distributed in a binder

In order to achieve small cohesive forces in the image layer, relatively soft substances of low molecular weight are used for them used. For example, ζ · Β · becomes in the case of a single component homogeneous image of an aerobic compound or low molecular weight polymer with a Lewis acid composed to achieve high photosensitivity of the image * · β chi oh t · become similar to two or more components Used in a solid solution for a homogeneous image layer, one or both of the components of the solid solution can be Be of low molecular weight so that the layer has the desired low cohesive forces Method can also be used in conjunction with heterogeneous image soles Though the binder can be sensitive to light in heterogeneous picture materials, it is Property not required «Me materials for a solo binder can be chosen solely according to their physical properties without concern for their · light sensitivity «·

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the. This also applies to homogeneous systems with two components, "where light-sensitive substances with the desired physical properties can be chosen. Any other suitable technique can be used to achieve lower levels Cohesive forces are applied in the image layer. For example, suitable mixtures of incompatible substances, e.g. a mixture of polysiloxane resin with a polyacrylic ester resin either as a binder in a heterogeneous system or in Connection to a "homogeneous" system can be used at which the photosensitive substance-either 'one of the incompatible Components (composed with a Lewis acid) or a separate and additional component of the image layer is. The thickness of the image layer preferably ranges from about 0.2 microns to about 25 microns, but usually from 1 to 10 microns and preferably about 5 microns »

The weight ratio of photosensitive pigment to Binder in heterogeneous systems can range from about 10 to 1 to 1 'to 10', ratios from about 1 to 4 to about However, 2 to 1 have shown the best results, so this range is preferred.

The binder in the case of heterogeneous image layers or the substances used in connection with pigment substances in homogeneous layers can, as far as applicable, contain any suitable adhesively soft substance or a substance which can be made adhesive white. Typical materials include microcrystalline waxes _s like Sunoco 1290, Sunoco 5825, Sunoco 985, all available from Sun Oil Co. j Paraflint® RG, available from Moore and Munger Company; Paraffin waxes such as Sunoco 5512, Sunoco 3425 available from Sun Oil Co .; Sohio Parowax available from Standard Oil of Ohioj waxes made from hydrogenated oils such as Capitol City 1380 wax available from Capitol City Products, Co., Columbus, Ohioj Caster wax Ir-2790 available from BakerCaster Oil Co .; Vitikote L-304, receives-

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borrowed from Duro Commoditiesj polyethylenes such as Eastman Epolene N-11, Eastman Epolene C-12, available from Eastman Chemical Puoduots, Co., Polyethylene DYJT, PolyäthyleneDYLT, Polyethylene DYIfP, polyethylene DYDS, all available from Union Carbide, Corp.j Marlex TR 822 »Marlex 1478, available from Phillips Petroleum Co.j · Epolene C-13, Epolene C-10 from Eastman Chemical Products, Co.j Polyethylene AC8, Polyethylene AC612, Polyethylene AC324 available from Allied Chemicals; modified styrenes, such as Picootex 75t Pioootex 100, Piocotex 120 available from Pennsylvania Industrial Chemicalj vinyl acetate-ethylene copolymers such as Elvax Resin 210, Elvax Resin 310, Elvax Resin 420, available from E.I. DuPont de Nemours & Co., Inc., Vistanex MH, Vietanex 1-80, available from Enjay Chemical Co .; Vinyl chloride-vinyl acetate copolymers, such as Vinylite VYLP available from Union Carbide Corp .; Styrene-vinyl toluene copolymers; Polypropylene; and mixtures from these. An insulating binder is preferred because it requires the use of a larger area electrically photosensitive pigment substances permitted. A mixture of microcrystalline wax and polyethylene is preferred since it is electrically non-conductive and tough and soft. If the image layer is not sufficiently tough and soft to allow breakage in the image-wise distribution, an activation step is used used in the method according to the invention. This activation can take many forms, such as heating the Bildsohioht, thereby reducing their cohesive forces or a substance can be added to or enclosed in the surface of the image layer, which reduces or promotes such a reduction in the cohesive forces within the layer · becomes such a substance referred to as activator or activating agent · Vorzueweiee should the activator have a high electrical resistance h »- * b «n to electrical breakdown / in the multi-ohmic structure to avoid. Ee is therefore often advantageous in trade available compositions of activators to clean

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to remove impurities that increase electrical conductivity. This can be achieved by sending the liquid through a clay sieve or by another suitable cleaning technique. ”In general, the activator can consist of any suitable substance that has the properties mentioned. In the context of the present description and also the following claims, under a. Activator are understood not only substances that are conventionally referred to as solvents, but also those that act as partial solvents, swelling or softening agents for the image layer. The activator can be used at any point in the imaging process prior to separating the sandwich structure _e ■ "■ · - ..

Low boiling point activators are preferred so that the resulting image can be fixed by evaporation of the activator. The fastest way to fix the image is by applying light heat. Of course, the invention is not limited to the use of such volatile activators.For example, non-volatile activators with a very high boiling point, such as silicone oils, e.g. dimethylpolysiloxane, and very high boiling point aliphatic hydrocarbon oils, usually used as transformer oils, such as e.g. Wemoo-C (Transfprmatorolj available from Westinghouse Electric Co., which uses imaging processes.Although these less volatile activators do not dry out by evaporation, the final image can be fixed by covering it with an eyeable sheet such as ζ · Β · -paper, Since the activator liquid soaks up · In short _9. any suitable · volatile and non-volatile activator can be used * ·! Typical activators are Sohip Odorleas Solvent 3440, an aliphatic (kerosene) hydrocarbon "* available from Standard Oil Oo. of Ohio, Tatra Mountains "

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-H-

Chlorocarbon petroleum ether, Freon 214 (tetrafluorotetraohlorpropane), other halogenated hydrocarbons, such as chloroform, methylene chloride, trichlorethylene, perchlorethylene, Chlorobenzene, triohlormonefluoromethane, tetrachlorodifluoroethane, Trichlorotrifluoroethane, ither such as diethyl ether, diisopropyl ether, Dioxane, Tetrahydrofuran, XthyTenglycolmoneäthyläther, aromatic and aliphatic hydrocarbons such as benzene, toluene, xylene, hexane, cyolohexane, gasoline, mineral spirits and white mineral oil and vegetable oils such as coconut oil, babus oil, palm oil, olive oil, castor oil, peanut oil and bone oil, Deodorant, dodecane and mixtures of these · Sohio Odorless Solvent 3440 is preferred because it is odorless and non-toxic as well as has a relatively high flash point

Although the image layers can be made as self-supporting films, they are usually applied to a sheet called a backing or donor sheet.A combination of a donor sheet and an image layer is called a dispenser solid constituents, such as ζ · Β · a ball mill, are mixed in · After mixing the constituents of the image layer, a desired amount is applied as a coating to a base · In a particularly preferred embodiment of the invention, an image layer is made of an electrically photosensitive pigment, distributed in a Binder applied to an electrically insulating dispenser sheet

The donor and recipient sheets can be made of any suitable electrically insulating or conductive material.Insulating materials are preferred because they allow the use of high-strength polymeric materials * Typical insulating materials are e.g. polyethylene, polypropylene, polyethylene terephthalate, cellulose acetate, paper, old plastic-coated paper as if covered with polyethylene · « paper,

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200A854

Vinyl chloride-vinylidene chloride copolymers and mixtures thereof. Mylar, a product made by condensation between ethylene glycol and terephalic acid "polyester manufactured by E. I. DuPont de Nemours & Co., Inc. is available because of its Durability and its excellent insulation properties en preferred. These high-strength polymers cannot only durable documents for positive and negative images, as they are generated on the donor and recipient sheet, but in addition they form an electrical barrier between the electrodes and the image layer, the electrical barrier Breakdowns in the multilayer structure when applied, the electrical Prevent fields · The donor and recipient sheet J can both be chosen from different materials. This is how a multilayer board with an insulating dispenser and a conductive receiver sheet can be created.

As stated above, the image layer is followed by the sandwich structure of donor sheet, recipient sheet and Image layer exposed to an electrical element · The electrical element can be generated in various ways. · Usually is the sandwich structure between two different ones Electrodes that carry potential · An electrical charge can also be applied to one or both donors · * and Receiver sheet Before or after the sandwich structure is formed by any known method of applying a | Static Charge · A static charge can be applied e.g. by touching the sheet or the support with an electrically charged electrode · On the other hand can either or both blades by using a corona charge source such as that disclosed in U.S. Patents 2,588,699, 2,777,957, 2,885,556 or by using conductive Hollen, as described in U.S. Patent 2,980,834 or by frictional electrical devices such as those in the US patent 2 297 691 are described »or by others suitable devices to be electrically charged

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The electric field can therefore be generated by all known devices for exposing an area to an electric field.The electrodes used can contain any suitable conductive material and can be rigid or flexible.Typical conductive materials are metals such as aluminum, brass, steel, Copper, nickel, zinc, etc., metallic coatings on plastic substrates, rubber made conductive by the inclusion of a suitable substance or paper made conductive by suitable substances or substances that absorb sufficient water to become conductive by placing them in a humid atmosphere · Conductive rubber is preferred because of its flexibility. If, in the method according to the invention, the image layer is to be exposed to electromagnetic radiation while it is arranged between the electrodes, at least one of the electrodes must be at least partially translucent.The translucent conductive electrode can be made of any suitable conductive, translucent material and can be rigid or flexible Typical conductive, translucent materials are ZeB. Cellophane, conductive coated glass such as tin or indium coated glass, aluminum coated glass, or similar coatings on plastics UESA, a tin oxide coated glass available from Pittsburgh Plate Glass Co., is popular because of its good conductivity and preferred for its high light transmission. In the method according to the invention, in which the donor and recipient sheets are made of a conductive material, both can, although not preferably, also serve as electrodes for the electrical field acting on the image. In this way, one or both of the donor and recipient sheets can perform a dual function in the method according to the invention.

The strength of the applied electric PeJds over the sandwich structure depends on this Mehrsohiohtstruktur and the materials used from · If ι · Β · "in hoohieolieren-

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of the recipient and donor sheet. used, so can very much stronger fields are applied than when relatively conductive Donor and recipient sheets "are used" as required Field strength can, however, simply be "determined". If too great a potential is used, it becomes an electrical one Breakdown occurs in the multilayer structure, causing an arc to occur between the electrodes. Will If the potential is too low, the screen will break Does not correspond to the respective picture pattern · For example, a 0.08 mm thick Mylar receiver sheet and a 0 ^ 05 mm thick one Mylar donor sheet used so can have potentials up to 20,000 V occur between the electrodes · The preferred Field strength between the multilayer structure is between 40 KV / mm and about 280 KV / mm of electrically insulating material. If relatively high potentials are used, it is switched on a resistor in the voltage circuit desirable, to limit the flow of current; thereby becoming common Resistances on the order of from about 1 megohm to about 20,000 megohms used

Depending on the image layer material used and the polarity of the applied field, the positive image is generated on the donor or recipient sheet. As it turned out, educate yourself the positive image on the donor sheet, if its neighboring one Electrode is at positive potential while a negative image is formed on the receiver sheet «That means that the illuminated! parts of the image layer adhere to the receiver sheet and the unlit areas remain bound to the donor sheet. It also showed that the best pictures then can be obtained if the exposure takes place through the donor sheet hinduroa '' * -

In the method according to the invention, the exposure of the Pictured atiohtbaree light, an ultraviolet radiation source or another suitable radiation source

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will. The electrically photosensitive substance is chosen so that it is sensitive to the radiation used is. Different electrically light-sensitive substances have different spectral sensitivities, whereby the spectral Sensitivity of many electrically photosensitive substances can be modified by color sensitization, so that either the spectral sensitivity range is reduced to a peak value or to a more panchromatic one Sensitivity can be broadened.

The image layer can be used at any point in the imaging process, auoh prior to charging the sandwich structure, exposed · For example, in one embodiment of the invention first the image layer on a donor sheet is exposed, then a receiver sheet to form the sandwioh structure door placed over the picture, the structure on top exposed to electric field and finally the sandwich structure separated · On the other hand, becomes a translucent donorand If the receiver sheet is used, the sandwioh structure can first be formed in the process, then the image layer is exposed, an electrical charge is applied to the donor and recipient sheets, e.g., through a corona charging device, and eventually the sandwich structure will be separated *

The sequence of the process steps, including the optionally applicable activation nose, can also be varied in other ways without departing from the general inventive concept. duroh application of Hitxe naoh formation of the sandwioh structure · In this way, the image can be copied at any time, if necessary, but before the separation of the Sandwioh structure, to be activated

You will benefit from the inventive method

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BAD ORiGINAL

following detailed description of the invention with reference to the Drawing explained in detail:

Figure 1 is a schematic side view of the sandwich structure Cut and

Pig · 2 a representation explaining the individual process steps « - "■■■ *.

An image sheet 2 comprising electrically photosensitive material 4 distributed in a binder 3 is applied to the surface of a donor sheet 5. A receiver sheet 6 lies on the image sheet 2 and thus forms the sandwich structure ■ . ™

Pig.2 shows an imaging process using the multilayer technique, with which positive copies can be made of positive originals on translucent or non-translucent recipient sheets or on translucent or opaque donor sheets. An image layer 201 contains an electrically photosensitive substance carried by a transparent carrier plate 205, which is exposed through a "transparent" donor sheet 203 to radiation originating from a powerful image 207. If, on the other hand, the donor sheet 203 is opaque, the Image layer 201 ζ · Β _ο exposed to a light image 207a »An activation step that can be used optionally is also shown in Pig · 2. Although the activating agent can be applied in any suitable way, for example with a brush, with a rough or soft roller, by flow coating, by condensation of steam or in some other way, in Pig. 2 the activating agent is applied as liquid 209 to the image 201 sprayed on from a container 211 · After the activation agent has been deposited, the absorbent sheet 213 is brought into contact with the image syrup 201 and the sandwich structure is closed by a roller, which simultaneously removes any superfluous deposited material.

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te activating liquid squeezes out · Under certain conditions the activation step can be omitted »For example * a sandwich structure can be produced in which the Image layer 201 originally only had small cohesive forces so that there is no activation and the receiver sheet is on the picture immediately after exposure 201 Can Be Applied · Typically, however, the use of an activator will be used on most image layers preferred.

After the receiver sheet 213 has been applied to the image layer 201, an electrical Field through with a voltage source 221 via a resistor 223 connected electrodes 217 and 219 are applied. Although it is shown in Pig * 2 that the sandwich structure is not one of the touches both electrodes 217 and 219, it can touch one or both electrodes when the electric field is applied. The sandwioh structure preferably touches at least one of the electrodes, which then serves as a guide, and faces it the other electrode to avoid sticking a distance of 0.025 to 0.08 mm

On the other hand, the charge electrodes can also be used as a core discharge roller 215, which is conductive and is used in place of the electrode 217 · You electrodes but can also consist of sharp edges or a κ · Β · ale friction charger formed with rabbit fur covered roller exist"

The registered polarity of the charge on electrodes 217 and 219 can also be reversed, so that electrode 217 negative and electrode 219 is positive. In the case of continuous operation, the light image is preferably so through projected a slot that has almost no relative movement

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occurs between the image and the donor sheet. The sandwioh structure after passing the electrodes 217 and 219 moves past the roller 225, which acts as a guide for the Sandwich structure and as an abutment when tearing open the Structure works. On the other hand, the should 225 can also be a sharp edge, a rod or a wire Distribution along the edges of the exposed areas and separates from the surface of the donor sheet 203, that was exposed with the photo 217 or 217a · Mach der The exposed areas of the screen 201 remain separated on one of leaves 203 and 213, while the niohtbelioh- | remain on the other sheet. These! Parts form a positive image on one sheet and a negative one Picture on the other sheet. AnsohlieSend can use different * The pixier process can be applied to the image after! separation to make the sandwich structure durable »

The following examples describe the invention in more detail, and indicate various preferred embodiments of the mapping method improved according to the invention to «Die Antei» » Ie and percentages are based on weight} if nothing else is specified ». j

First, a picture layer is made of in a binding agent "- divided oil-containing substances, such as substances," Itwa 100 f © ilö Naphthol Eeö B ,; Köd © 20-7575 * © rMltliöl from öer Ameriean öyaiiamide öomp. _? are in Äthyl © niiamia as

Reagent dissolved «Me-solution. * Dr &" immediately Süreh grefeae iapier-filtered tm & das; filt3fatsiii "t

ale-.Eeagöass ^^ gemisölai; * The "laphtkol" Esa-B-throw as alcohol precipitated m.ü old one

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After separating the ethylene amine and alcohol, the electrically photosensitive material is washed and filtered with successively added amounts of isopropanol, a mixture in the ratio 2: 1 of isopropanol and deionized water and five washes with deionized water until the filtrate is neutral the fabric was washed successively in dimethylformamide and methanol until the filtrates were pale yellow in color. The naphthol Red B is then dried ^{at 40 0 O in vacuo.} About 2.5 parts of purified naphthol led B are combined with about 0.5 parts of Benz Yellow, code 30-0535 »available from Hilton Davis Chemical Comp. The Benz Yellow is cleaned by solution extraction from an organic solvent. The Naphthol Red B and Bena Yellow are combined with about 45 parts of naphtha and milled in a ball mill for 4 hours.

The binder is made by adding about 2.5 parts of Paraflint RG, a low molecular weight paraffin available from Moore and Munger Co., New York City, about 3 parts of polyethylene DYIiT, available from Union Carbide Corp., about 0.5 part of one as Elvax 420 erhältliohen from the EI DuPont de Nemours Inc Vinylaoetatäthylenkopolymer, and about 2.5 parts of a Picootex than 100 from the Pennsylvania Industrial Co. Chemioal erhältliohen modified polystyrene, with about 15 parts Sohio Odorless Solvent 3440, a, of the standard Oil Company available kerosene component, can be combined with one another. The mixture is heated until it dissolves and then cooled. The binder and the pigment mixture are then ground in a ball mill for about 18 hours. About 45 parts of isopropyl alcohol are then added to the mixture and this mixture is ground again in the ball mill for 15 minutes. The resulting image material is then with the aid of a doctor blade with a slot setting of about 0.11 mm on an approximately 0 _v 08 at the strong

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Mylar sheet applied to make a donor sheet. The Spenäerblatt is then at a temperature of about 45 o dried·

The donor sheet is placed on the tin oxide side of a HESA-G glass plate placed so that the image side facing away from the tin oxide is. The image layer is activated by applying Sohio Odorless Solvent 3440 using a brush and through Laying a translucent film made of polypropylene as a receiver sheet on the activated Spenäerblatt the Sandwioh structure educated. The image layer is made with a photograph, a source of incandescent light with 4800 luxsec three minutes th through the translucent receiver sheet for a long time exposed. After exposure, an electrode made of black paper and a DC voltage are placed over the receiver sheet of 10,000 volts between the HESA glass plate and the black paper electrode placed over the sandwich structure. When voltage is applied, the sandwich structure is separated, whereby a pair of images is obtained whose positive image is on the donor and its negative image is on the recipient sheet.

Example II

The procedure of Example I is repeated with the exception of < that the sandwich structure is reversed so that the light ** The translucent propylene film is on the NESA glass plate and the image layer through this translucent donor sheet hinduroh is exposed · When separating the pairs of leaves images are created with the positive image bound to the recipient sheet and the negative image bound to the donor sheet

Example III

First, again one distributed in a binder becomes electrical image layer containing photosensitive substance

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posed. About 100 parts of Naphthol Red B, code 20-7575, are dissolved in ethylenediamine as a reagent. The solution is immediately filtered through a coarse filter paper and the filtrate is mixed with an equal volume of isopropanol as a reagent. The naphthol Red B is precipitated in the alcohol and removed with the help of a centrifuge. After the separation of ethylenediamine and alcohol, the electrically photosensitive material is washed and filtered with successive amounts of isopropanol, a mixture in the ratio 2: 1 of isopropanol and deionized water and five Washes with deionized water until the filtrate is neutral. Finally, the fabric is washed successively with dimethylformamide and methanol until the filtrate has a pale yellow color. The Naphthol Red B is then ^{dried in vacuo at 40 0} O. About 2.5 parts of purified Naphthol Red B are mixed with about 0.5 parts of Benz Yellow, code 30-0535, and 0.0025 parts of 2,4,7-trinitro -9-fluorenone (TNi ¹ ) available from Eastman Organic Chemicals combined. The Benz Yellow is purified by solution extraction from an organic solvent. The Naphthol Red B, Benz Yellow and TNF are combined with 45 parts of naphtha and ground in a ball mill for four hours

A binder is made from about 1.5 parts Paraflint RG 3 parts of polyethylene DYLT, about 0.5 part of vinyl acetate-ethylene copolymer, available under the name Elvax 420 and about 2.5 parts of Piocotex 100, a modified polystyrene, along with 15 parts of Ohio Odorless Solvent 3440, a kerosene ingredient · The mixture is heated until it dissolves and then cooled. the The binder-pigment suspension is milled in a ball mill for 16 to 20 hours. About 45 parts of isopropyl alcohol are then added and the mixture milled for an additional 15 minutes. The resulting picture laminate is opened with the help of an Abetreiohmeeaer set to about 0.11 mm a 0.08 mm thick mylar sheet applied to a donation

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derblatt · to produce. The donor sheet is dried ^{at about 45 ° O.} '

A donor sheet made as described above is on the tin oxide side of a ÜTESA ^ glass plate so that the Image layer facing away from the glass plate. Through the NESA glass plate and the translucent dispenser sheet through the picture looks with a Mohtbild with a total exposure strength of 1.5 luxsec exposed · After exposure the image layer is activated by using Sohio Odorless Solvent 3440 and a paper receiver sheet over it the activated image © o is not placed. Will be on the recipient sheet put a black paper electrode and a Gleioh voltage of 9000 volts over the sandwich structure thus formed created. When the voltage is on, the sandwioh structure separated and obtained a pair of images, the positive of which Picture on the donor sheet and the negative picture "on the Recipient sheet is bound "

Example IY

The procedure according to Example III is repeated with the exception that the image layer is exposed directly on its layer side · After the exposure, the picture is activated and the sandwich structure is formed by placing the receiver sheet on the image face. During the separation under influence ^ of an electric field, two images are obtained, of which the .positive image on the donor «and the negative® image on the Receiving sheet stuck

Example V

The procedure of Example I is repeated with the exception ae that the naphthol Bed B is replaced by naphthol Bed H 0 «I. No. 12390, under the code 20-7515 voa of Amerioan Oyanamid ersetat will * if the Sandwioh structure is separated

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under the action of an electric field, two images become received, of which the positive is bound to the donor »and the negative is bound to the recipient sheet ·

Example VI

About 8 parts of Quindo Magenta, BV68O3, a 2,9-dimethylohinacridone available from Harmon Colors Co., are distributed in about 16 parts of a binder made according to the procedure of Example I. The resulting image is coated with a applied to about 0.11 mm doctor blade set at an approximately 3 mm thick mylar sheet, · to form a donor sheet, the donor sheet is dried at about 50 ⁰ C.

The donor sheet is then placed on the tin oxide side of a NESA glass plate so that the picture is facing away from the tin oxide side. After activating the picture material Sohio Odorless Solvent 3440 is sprayed on as a sandwich structure by applying a 0.05 mm thick hylar film Receiver sheet formed. The image is three minutes long enclosed with a photo · After exposure, a black paper electrode is placed on the receiver sheet and »wipe the NESA glass plate and the paper electrode • A DC voltage of 10,000 ToIt is applied. If you still enter - If tension is maintained, the sandwioh structure is separated, resulting in a pair of images from which a positive image emerges the donor and a negative image is bound on the Eapfängerblatt

Although · substances and substance quantities are determined in the above Construction friction is given as the preferred method of execution other substances can also be found in similar substances feed. Additional material can also be differentiated below Beatand parts are added to the properties of the Bildaohioht or the other Beatand part · iu improve, iu

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perfect a. or to be modified in some other way. For example, different colors, spectral sensitivi @ r © r ₉ activating agents or electrical seniors, such as acids, can be added to the various components of the sandwich structure.

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Claims (1)

- 28 - Claims [Z) Imaging process in which a tough-soft image layer, which is electrically light-sensitive to electromagnetic radiation used for its exposure and is sandwiched between a donor and a collector sheet, is exposed to an electric field and at the same time the sandwich structure is used to break the image layer is separated in image-wise distribution, characterized in that the image surface (2) is exposed before it is exposed to the electric field 2 · Imaging method according to claim 1, characterized in that the image layer (2) by the electromagnetic Radiation (207) at least partially translucent donor sheet (203) is exposed 3 · Imaging method according to claim 1, characterized in that the one for the electromagnetic radiation (207) Lichtundurohlbaren donor sheet (203) as a coating applied image (201) directly on the Sohiohtseite is exposed 4 · Imaging method according to claim 1, characterized in that it is marked net that the between the donor (203) and the recipient sheet (213), at least one of which is at least partially translucent, arranged image layer (201) is exposed through one of the leaves (203, 213) hinduroh 5 Imaging method according to Claim 1, characterized in that that the image layer (201) before its eandwiohartigen Arrangement between dispenser (203) and Eapfängerblatt (213) is exposed. 6. Image lengthwise process according to one of the claims 1 to 5, since 009837/1895 characterized by, that before separation of the Sandwioh structure (203, 201, 213) the image layer (201) is treated with an activating agent (21 II! Imaging method according to one of Claims 1 to 6, characterized in that the image layer fabric (4) is one in a binder (3) distributed electrically photosensitive Substance (4) is used ». 8 »Imaging method according to claim I _1, characterized in that an electrically insulating material composition is used as the binding agent (3)« 9. Imaging method according to one of Claims 1 to 8, characterized in that an organic, electrically photosensitive substance is used as the image viewing substance (4). 10. Imaging method according to claim 9, characterized in that the Liohtsenslioher substance (4) 1- (2 »-Methoxy-5 • -nitrophenylazo) -hydroxy-3 ^tl -nitro *» 3-naphthanilide is used · 11 «imaging method according to claim 9ι, characterized in that 2,9-dimethyloninaoridone is used as the liohtsensitive substance (4). 12 mapping process according to one of claims 2 to 11, duroh indicated that Hit * · as an activating agent. is applied· 3 · mapping method naoh «intm dtr Aneprüoh · 2 bit 11, which indicates that al · Aktirierungeaittel (211) • in for di · Bildeohioht (201) » indtsttn · partly · effective- « lan ·· LöeungMitt · !, a Qu * ll «itt * l or a W * ioh» aeh * r 009837/1895 . BATH ORIGINAL is used · 14 · Image plate, produced according to the imaging process according to one of claims 1 to ORIGINAL INSPECTED 009837/1895