DE1571826A1 - Reproduction of images from printed surfaces - Google Patents

Description

DR. ING. F. WUESTHOFF> O DIPIi. ING. G. PtTLS 'ASSB S. DIt.E.r.PECHMANN PATENTANW-AI.T1! TBtBOBAMMADRBMB ₁ PBOTKOTPATKHT mOvobbk

U-32 469

Description of the patent application

THE CHAMPION PAPER CO. LTD. Alpenstrasse 1, Lucerne, Switzerland

concerning

Reproduction of images from printed surfaces

The invention relates to the reproduction of images, in particular to the production of copies printed surfaces, whereby a copy sheet is placed against the printed surface to form the image of the image to effect on the copy sheet.

The invention is directed to a new type of copying in which an image is placed on a printed sheet Can be reproduced on a copy sheet simply by placing the copy sheet against some of the printed sheet

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Seconds without a special supply of electricity, heat, light or the like. The invention uses the It is stated that when the moisture content of the printed sheet and the copy sheet is different, Moisture vapor from one sheet to another is greater in the non-image areas than in the image areas wanders. This selective migration occurs in part because of the printing color or the physical change in the Structure of the sheet caused by the printing process that creates the image, a barrier to migration of the steam forms on the image surfaces.

In the preferred form of the invention, it employs a concept in the following manner. On one surface an impenetrable plastic copy sheet creates an extremely thin film. The film is pcrös, so that it can absorb moisture. The film is now moistened and against a printed sheet, e.g. a book page, held for a few seconds to allow the moisture to migrate towards the printed sheet. The proportionate high absorbency of the unprinted areas of the printed sheet causes the neighboring ones to dry out moistened surface of the copy sheet, while those areas facing the printed image,

_o remain in a moist state. Thus the picture becomes

e> on the copy sheet in the form of a relatively moist surface °> generated. In certain forms of the invention this is the image ° permanent and recognizable. In other forms of the invention

po this picture is not always immediately usable, and it will be further stages, which are described below, for

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Fixing a recognizable image on the copy sheet or an end sheet to which the copy sheet is attached is applied; but in all of these the basic mechanism of imaging is diffusion of moisture.

There are many technical approaches used to obtain a frozen recognizable image can be. There are four basic categories of working methods, which are described here and which are labeled as "selective solution", "main process (prime) developer and image transfer". All they have their variants and in some cases the stages of a category of procedure are used in execution applied by stages of a different process category. All the methods have in common the selective migration of Moisture in the image areas and in the non-image areas between a copy sheet and a printed sheet.

he

In a 4e * practical embodiment of the invention gets on an impenetrable. Copy sheet formed a porous film and this film with a liquid humidified, which consists entirely or predominantly of water. The moistened film of the copy sheet is against a printed one Paper is laid and water evaporates and migrates selectively into the non-image area. The water evaporates over

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the picture surfaces, but because of the vapor barrier that goes through the pressure is generated, almost an equilibrium is immediately reached, and that over the image areas The film stays moist. In the non-image areas, the affinity of the cellulose in the paper for water causes the rapid and continuous extraction of steam from the space between the leaves. Thus there is a continuous or sometimes even complete drying of the copy sheet film in the non-image areas while the Surfaces that lie above the picture areas remain relatively moist.

As stated above, the invention relates to a Vapor diffusion process. The vapor character of vapor diffusion in the present method is determined by interposing a nylon mesh between the printed sheet and the copy sheet to prevent capillary migration of the Exclude liquid between the leaves. This system produced a recognizable image on the copy sheet. According to the present method, too, images were produced in which the printed and copy sheets are not in contact were with each other, even through an interposed sheet of mesh, but were only separated by an air space.

The invention is particularly valuable in reproducing images from cellulose paper, including Bolchen cellulose papers, which are coated with a pigment and a binder, as these papers are the largest source

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of print material from which reproductions are to be made and because of the large capacity of Cellulose to absorb moisture. However, the invention is not necessarily limited to such papers. Because as long as a sheet has an alternating affinity for moisture, e.g. between the printed and the non-printed areas, the invention applies to such a sheet applicable. Furthermore, the most important application of the invention involves the migration of water vapor from a copy sheet into the printed sheet, but the invention is not necessarily limited thereto. E.g. the procedure can be according to of the invention can also be carried out by adding ammonia to the printed sheet and counteracting a diazo copy paper the printed sheet lays. The ammonia vapors diffuse into the diazo copy paper extremely quickly in the non-image areas, thereby creating blue mirror images on the copy paper and thus the applicability of the invention to other vapors demonstrate than water. The invention also includes the migration of steam from the printed sheet into the copy sheet.

There are a number of known methods of producing images in a film covering the surface of a film Copy sheet, these being, for example, photographic, electrophotographic and thermographic papers. These Methods are generally characterized by requiring

a) a sensible supply of energy, such as light, heat or a corona discharge from a source,. which is separated from the copy sheet.

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b) a chemical reaction or a physical one Change in the film which is caused at least by an externally supplied energy.

The present process is to be distinguished from the known process in that it does not require any input of energy from an outside source. The copy sheet is simply placed against the printed sheet to make the image of an image. During this time, and in some cases for a short time thereafter, is the selectively changed the physical structure of a film on the copy sheet, and either a radical change in its optical properties, in particular the processes with selective solution the main process and certain Image transfer process effects, or to selectively perform a subsequent one in particular areas of the copy sheet film Reaction or physical change, especially in the embodiment with developer and in certain cases To prevent executions of the image transmission.

Definitions ;

In the description and the claims, the following terms are used with the given definitions used.

Printed Sheet - Any surface bearing an image to be reproduced that has an unevenly

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There is always an affinity for moisture, such as the image and the surface area of the image, usually the printing ink, which forms a pattern that is relatively impermeable to water vapor. Most often in practice the printed sheet is made up to a large extent of cellulose fibers together with ar. common paper making materials including i :. many fellers. _t jeleiate; a paper (tubsise) and / or with • i :: - e-: surface coating that contains rigniente and binding agents · ürauohbarkeit; However, the invention is not limited to structured and printed papers. The important factor underlying this is a different affinity for moisture between the parts of the image and the parts of the image. The term "printed" as it is used here is not limited to printing by conventional means, for example letter printing, engraving, offset or the like, but rather the term is intended to include printed "carbon paper, mimeographed and electrostatically generated and hand-drawn leaves.

Sheet of Paper - The sheet of paper placed against the printed sheet to create a mirror image of the printed sheet. Usually the copy sheet consists of an impenetrable backing sheet on which a

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porous film is formed.

Impenetrable - applied to the backing sheet of the copy sheet of such quality "that it prevents a significant amount of liquid or vapor from migrating in or out of the sheet in the time it takes to make the copy.

Final sheat - A sheet of paper against which the copy sheet is placed to form a permanent rightreading image.

porous film - a very thin film - formed on one surface of the copy sheet. The film is able to adsorb a small amount of moisture evenly distributed over the surface of the sheet; and desorb. The porosity is generally dependent on the structure of dimensions that cause light scattering. The film can be formed by providing the copy sheet with a coating, or etching, or engraving in the usual way.

- wetness - (moisture, humidification): refers to small amounts of liquid on the surface of the leaf, ₅ per week. of the K, pierblattes as it is in this procedure

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is used, e.g. the Jiienge, which is mounted on a porous Film remains when the film is wetted with a absorbent paper towel dry and a few seconds is dried. The liquid is usually water or a .remisch of wet, with one or more others Constituents, but can be any liquid or mixture of liquid that allows selective vapor diffusion, related to the printed sheet.

Mixtures of liquids - Sine intimate and homogeneous association of liquids, regardless of whether the one liquid is in the. other is resolved.

Solvent : used in the selective solution process and certain variants of the transfer process. Any liquid which, when concentrated enough to soften, can soften a porous film to allow confluence, but which is less absorbed by the unprinted areas of a printed sheet than some or all of the other components of the liquid used in the process. Usually the solvent is mixed with \ vaaaer and is less strongly absorbed by the cellulose fiber.

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Paper : ϊί-in sheet, which is made of natural cellulose or 3? RT thetic fibers, indifferent, cb ;; eleitat or whether provided with fillers, or coated or not, whether coated or not »x ^: all coated, empty drawing is not allowed Form an impermeable barrier to the diffusion of vapor.

It is an object of the invention to provide a method for Reproduction of a 3ilc.es from a printed sheet on To create a copy sheet that includes the following operations: Generating a high moisture content in one of the leaves; Laying a copy sheet on the printed sheet for a sufficient period of time so that the moisture from the wet bath into the dry one Sheet can selectively diffuse into the non-printed areas to the greatest possible extent.

It is a 'further slide of the invention, a 7: drive to create, for making copies from a printed sheet, the image areas of which have an affinity for Have fumes that are different from those of the flat which is characterized in that a thin film is applied to an impenetrable copy sheet, which is able to improve its optical properties through the

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To change the presence of a liquid or a mixture of liquids, and to wet this film with the liquid or the liquid, place this sheet with de:., Rilm against the printed sheet until a substantial _; ohe. " eiii.e of moisture from the film into the non-image area. of the printed sheet has diffused, and then separates the sheets from one another.

is another goal of the invention, a process .: u. -jchaf f ei: zua He .; reduce a picture from a berucivus :. ^ l ^ tt made of cellulose fiber :: whose image surfaces are printed with a Lirvcki'aroe, the barrier for the "ineiiiwanderr". forms of Jauif, daduro ^, rekeiuizeicnet, dais iiian :, a thin lorösen IiI; :: α, '^ ϊ the Lberflache an impermeable copy sheet generated, i these Mim: .it wetted water or Aaser and a reactive compound, which on ivovierblatt the printed sheet is in place for sufficient time for the wet film to selectively diffuse from the film into the image areas of the printed sheet, and to expose the sheet to a developing medium which, in the presence of v, ^r _A sser or of water and the reactive compound reacts, so that a color is generated in the image areas of the copy sheet.

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Another object of the invention is to provide a method of forming an image from a printed sheet create, characterized in that the vapor diffusion is used, as described above, to a humidified To generate image area on an ICopierachicht and then that Transfer the image to a finished sheet. These and other objects of the invention will become apparent from the following description easier to see when taken together with the drawings.

FIG. 1 is a perspective view of a package of copy sheets which, according to an embodiment of FIG Invention are made.

Figure 2 is an enlarged cross-section taken along line 2-2 of FIG. 1.

Figure 3 is an enlarged cross-sectional view showing the schematic explained the main implementation

Selective solution process

Laughs. 1 selective solution procedure is inserted specially prepared copy sheet ge;: er a printed one

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Sheet for a few seconds and a permanent appears legible image on the copy sheet. Nothing more is required.

In particular, a copy sheet having a permeable porous surface with a sensitizing liquid is used heated from several components, which is able to permanently change the optical properties of the surface, simply by holding the moistened surface against the printed sheet for a short time. One plausible explanation for the actual mechanism of this Procedure has been developed and it has been appropriately referred to as a selective solution, however, it should be understood that that the method for displaying images naoh this

Embodiment of the invention using a river '· ■ ■ sigkeitssystenis from several components for moistening the I copy sheet surface should not be limited to the theoretical mechanism of selective dissolution> which is described below.

The copy sheet is made by forming an extremely thin opaque porous film on a surface of an opaque transparent sheet. The film is moistened with a sensitizing liquid that contains a

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Contains a mixture of water and an organic solvent, the concentration of the solvent being weak in order to reduce the optical properties of the poor. To change i'ilms * The copy sheet is lived in a few seconds on the printed sheet that is to be reproduced. In the image areas, the requirement that moves against the printed sheet is quickly absorbed in the cellulose fibers. The solvent vapor is not absorbed as quickly as the cellulose fibers have a greater affinity for water than for the solvent. Thus, the film that lies over the photographic image areas is selectively deprived of its vase content and the concentration of the solvent is increased significantly to an extent that it increases in size and changes the optical properties of the miniature. The change in the optical characteristics usually consists in a transparent making of the film ir. The i'ichtbi Idf laugh, whereby the I ¹ IIm is made transparent by the action of the solvent, which solvates the opaque structure of the film and thereby the collapse and allowing the structure that forms the PiIm to coalesce. In the image area η, the barrier created by the pressure prevents migration of both V / aeserdampf and solvent vapor from the porous film and the concentration of the

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Lödui; The means remains too small in order to solvate the film. The i: = ttceffekt consists in the fact that the film ^ r. ■?:. I. The photographic image becomes more transparent, and the opaque fiIr. ir: the printed areas remain. The image areas are known as directly visible areas on the reverse side of the transparent 2 ^; lattes to be viewed »

■ e; .. \ the desired reproduction is obtained, the copy sheet is taken from the; printed 31att removed and air dry ^ elaatiei .. The steam pressures or G-eschwin— di _f ; keit der 7eraar.} - funi_: vo :. The solvent and water are such that while the sensitizing fluid is air-dried, the concentration of the solvent in the flat pools never reaches the level that would allow the film to be made transparent.

Although the above-described assumed liechanisi: ius by which the opaque film is made transparent, appears plausible, it is of course overly simplified. A complete description of L'echanisnus der Screen area would have to put into account 1. the change in temperatures, which is a rapid Accompany drying and the numerous "ege in which the temteraour changes the iluii of the plastic in the

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Influence egg and image areas.

2. the changes in surface tension and viscosity the solvent, and the plastic with continued Evaporation.

3. the influence of solvent migration from or into the Plastic and the resulting reduction in the transformation temperature of the piatric polymer in glass.

4. The influence of change of speed with that these various changes are made

5. Influence of the different types of light scattering structure (open pores versus closed pores, Konigv.-arir. Structure versus arbitrary structure etc.)

6. The temperature, relative humidity, the speed of air movement, the exposure time, the initial moisture content, the barometric pressure at which the copying is carried out. Ir. In practice it has been found that it is easier to produce legible copies than to demonstrate conclusively, -.veIcher .uechar-is .-. Uis is dominant for image formation.

üi: cellulose acetate sheet was ii. Acid for 4 seconds submerged and iait'-less rinsed unö ^ e-orccknet. This treatment yielded eir. Cellulose acetate copy sheet with a

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opaque porous film. Under the microscope, the surface of the opaque film appeared as a porous fibrous cotton wool or the like. The opacified cellulose acetate copy sheet was then sensitized by immersing it in a 23 / - volume solution of 1.4 dioxane in water for about 4 seconds. The excess liquid was then erased from the surface of the sheet by squeezing it firmly between absorbent paper sheets so that no dry liquid could be detected by sight or touch. The sheet was allowed to dry by exposing it to air for a few seconds to make sure there was no liquid on the surface. The obtained surface of the gelulose acetate sheet contained moisture from dioxane and water. The sheet was then held in uniform contact with a printed sheet of paper w * # 4e for about 15 seconds, after which it was removed from the printed sheet and exposed to air until the residual moisture had evaporated. A white permanent image developed on a relatively transparent background on the surface of the sheet upon exposure to air. The peri: anent image on the surface of the copy sheet was a mirror image of the printed matter on the paper. When looking at the width of the cellulose acetate copier

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leaf it opposite to the one with the picture. J ¹ Ii before he

themselves/
gave / a positive, correctly legible image on the * relative

transparent K ackground.

Example 2

The procedure according to claim 1 was kit '^; The same materials were repeated, except that in this example a double-thickness ylorite stocking fabric was inserted vis-à-vis the surface of the cellulose acetate copy sheet and the printed paper, stirred for 15 minutes for 3 times. A permanent image was obtained on the surface of the copy sheet, and it was of the same character as described in Example 1.

Example 3

A cellulose acetate copy was immersed in a semis, one part by volume of isopropanol and 2 parts by volume of i) acetic acid and one part by volume of water for 5 seconds. The sheet was rinsed with water for 25 seconds and then the excess liquid was wiped off with damp paper towels. The moist surface of the cellulose acetate copy sheet was then about 1/2 minute in

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brought into contact and ait a printed sheet of paper.

liacji distance dee copy sheet from the printed Elatt and exposure to the air was obtained on the surface of a 31attes weiases permanent mirror image developed _t; e; s a transparent substrate.

Table I.

■ Deis] .iele for selective solutions; : ss-sten: e.

i, x copy sheet ser ... icllizator

solution backing sheet of porous? ilm

4 cellulose acetate cellulose acetate ³ 11; '.rat;, rclαctor-

2 ^; ., Lti.ylene / lycol-

Uioncä thy lather 61 '■ μ asL-: er

5 cellulose acetate and cellulose acetate ^a 11i. Tioxane

concentration camp\. ^ .ti / leue _t : lycol-

monoethyl ether ο? ¹ ; - water

6th Jlasplatte At hylceliuiose 25.- ^ ithylei% lyl: ol-
monoethyl ether
75, '-'<ater 7th Polj'-propylene ^ .thylcellulose Sensibillator solution
after -jeiorisl c 6th j οIystyrene J-i.thylce: .lulose Üer.sibilisa "ccrlcsun £
according to example 6 Q Polypro2: ylen H
jitiiyl cellulose 2J, Per-tcxoT "
tL; '. glaze

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10 saran

Ethy! Cellulose

His butyrolactone $ 22 Ethylene Glycoline Acetate hy lather 67? » water

11 saranthyl cellulose

$ 1-1 moxan
22 $ Ethylene glycol monoethyl ether 67 $ Nasser

12 glass plate cellulose acetate

3 $ glyceryl tri-

acetate
3 $ Pror.ylencarb -

nat

27 '/ - Ethylene glycol monoethyl ether 67; - water

13 Saran cellulose acetate

sensitizer solution according to example 12

14 polypropylene cellulose acetate

Sensitizer solution according to Example 12

15 lolystyrene cellulose nitrate ⁶ 5 $ x'ropylene cartonate

monoethyl ether 15/9 Ißor.ropanol 65 '/ V.'as ^ he

1-6 polypropylene cellulose nitrate

sensitizer solution r. to example 15

17 polystyrene cellulose nitrate

8> ί I'ropylenecarbo-

nat

24 / isopropanol 6i

fi water

18 polypropylene cellulose nitrate

Sensitizer solution according to Example 17

19 polystyrene cellulose nitrate

Pentoxone

3 ethylene glycol

monoethyl ether

«Ater

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■ 20 polypropylene cellulose nitrate

Sensitiser solution according to the example

21 polystyrene cellulose acetate butyrate

8 $ propylene carbonate 24 $ isopropanol 68 $ water

22 Polypropylene Cellulose Nitrate- ⁸

5 $ butyrolactone 85 $ V / water

23 polypropylene cellulose nitrate
SAITTOLITIF

7 $ Pentoxon * ¹ 14 $ Atiiyleneglykol monoäthylather ^ water

24 Polypropylene Polyvinylace Tat
Poly (vinyl methyl ether-maleic anhydride) ⁿ

But; / rolao1ion water

25 polypropylene polyvinyl acetate

Ii-methyl-2-

pyrrolidone

water

26 polystyrene polyvinyl acetate "

$ 10 diacetone alcohol $ 98 v / ater

27 polypropylene polyvinyl acetate 10 $ ethylene glycol ροIy (vinyl methy1- monoethyl ether ether-iaaleic acid- 90 $ water anhydride) Carbopol 934 * ¹

28 polypropylene polyvinyl acetate 20 $ dioxane poly (vinylmethyl- 80 $ water ether maleic anhydride) Carbopol 934 ^

29 polypropylene polyvinyl acetate 20 $ dioxane Polystyrene $ 80 water

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a) Formed by dipping the cellulose acetate sheet
in acetic acid for a few expressions, rinsing with water and drying

b) Formed by covering the document sheet with about a 5% solution of ethylcellulose in methanol and dryness »

c) Formed by coating the backing sheet with a 4.2% solution of Ithy! cellulose in a solvent mixture of methanol and heptane, volume ratio 4 »1, and
Dry.

d) Formed by coating the backing sheet with a 2.5 / Sigen solution of cellulose acetate in a solution mixture from acetone, toluene and ethylene glycol monoethyl ether, (volume ratio 2: 1 * 1) and drying.

e) Formed by covering the 3 backing sheet iait
an 8-year solution of the cellulose nitrate in a solvent mixture of methanol and acetone, volume ratio 4> 1, and drying.

f) Formed by covering the backing sheet with a 5.3% solution of cellulose acetate butyrate, volume ratio 3: 1, and drying.

g) Formed by coating the backing sheet with a 7.5% solution of cellulose nitrate and a plasticizer

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2 B. öantolite -iKP, that is a resin-like consumer product made from arylau.fonainide and formaldehyde manufactured by ior i..Gii3ar: to Chemical Company, volume ratio 9: 8 in one i. «'- ^; Oil cut! Mixture of methanol and denatured alcohol, volume ratio 1:13, and drying.

L) formed by covering the "supporting sheet with a · · 3.5> i ^ en solution of polyvinyl acetate, poly (methyl methyl ether), aleii.saareauhydrid); Crewicütsverhaltnis 1i1, in acetone and Dry.

i) Formed by covering the backing sheet with a 2.5 - ,. IiTSU solution of polyvinyl acetate ir. Acetone and drying. , '·) Formed by covering the original sheet with a 2.5 -, - ii ^ en solution of polyvinyl acetate-poly-ivirclciethyläthermaleinsäureanhydrid) and a carboxyviny! polymer with a high ilolar weight, e.g. Oarbopol 934 of the BF G-udrich Chemical Go., Weight ratio 1: 30: G, 7 in a mixed solvent from acetone and methanol, volume ratio 6: 1, and drying.

k) formed by coating the backing sheet with a 2,5 '/ aigen solution of ^r Polyvinylacetatpol3 styrene, a weight ratio of 3: 1 in acetone.

m) Peiitosol is a commercial mixture of pentanols from Shell Chemical Co.
η) Pentoxone is a commercial mixture of pentanones

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of She ¹ I Chemical Co.

Example 30

A) A glass plate was covered with a thin coating of a mixture of equal parts by weight of polyvinyl alcohol and poly (vinyl methyl ether maleic anhydride) equipped « The coating was allowed to air dry. The dried coating was then printed on with a grease pen.

B) A copy sheet was made by dipping one Surface of a polypropylene sheet in a solution of. 2 grams of polyvinyl acetate and 0.5 g of poly (vinyl methyl ether, maleic anhydride) in 100 cm acetone and drying. The dried opaque porous film was sensitized by Immerse in a solution of 33 ^ Dime thy lsulf oxy d in V / water for about 10 seconds and wiping off the excess liquid to moisten the surface with the Sensitizer. The sensitized copy sheet was then in uniform contact with the printed surface of the coated glass plate produced according to A used. After 30 minutes, the copy sheet was removed from the printed surface and it was a white permanent image

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visible on the surface of the copy sheet. The leaf was of the same character as it is bäsohrieben in Example 1, but the transparent areas corresponded to the image areas the glass plate

C) A glass plate with a dispersion of 100 g kaolin and 15 g casein in 35 cnr water with sufficient Lot. Ammonium hydroxide coated to disperse the casein au, 25.B. 2.25 g of a 28% ammonia solution, and dried

A part of the dried coated glass plate was written on with a grease pen. Mn strips of aluminum foil were applied to a second part and a third part was scratched through the coating surface so that the bare glass was exposed. ¹

A copy sheet that was coated and made fragile was as in Part B above, was about 1 minute over the printed area, one aluminum barrier and one scratched Surface of the coated glass attached. Images of the printed area became impermeable to vapor through aluminum made and the scratched) deeply cut! Relief surfaces were all reproduced on the surface of the copy sheet.

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The images were permanent and of the same character as described in Example 1 above.

In Examples 30 B and C, the images formed were negative due to the use of a light converted The working method and the mechanism that caused the formation of negative images is believed to be which follows

The sensitizer used was an aqueous solution of dimethyl sulfoxide, which evaporates slowly, and the Ifilm was made sensitive by immersing it in the solution, Removal of excess liquid and in the

dry him / her the PiIm 1/2 to 1 minute before one / ia con-

clock with the printed PiIm.

This drying did not make it sticky and cause that the surface can regain its original opacity started. There was a relatively concentrated solvent under this surface but it tried to diffuse back into the surface and evaporate. But it slowly dissolved in the plastic when it was more concentrated became. When it could freely evaporate, it escaped together

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uit de ..: wetter, without causing a permanent change in the capacity. '., & however, it nn was blocked by a relative impermeable barrier (grease pencil, glass or aluminum foil), the organic solvent makes the "auptmenge of the coating, the superficial dried over flat again plastically and caused eusanmenawfallen that the structures of Bi laughing Idf \ nid. become transparent.

In the examples given, the copy sheet is treated with a sensitizing liquid before it is applied to the printed side. The application of sensitizing liquid lcar.r. be carried out by the manufacturer of the cover sheet, the sheet being packed in a closed container that keeps the 3? . Such a paint is shown in iigur 1 and 2. The pack is labeled 1C and is a sealed stack of alternating layers of sensitized copy sheets 11 and sealing sheets 12 made of a water-impermeable plastic, 2.3. Saran. Eie copy sheets are, for example, biaxially oriented plastics

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a thin porous film 13 on one of its surfaces. ]) he thin, porous film is covered with a sensitizing gel preferably moistened with water and an organic solvent for the mim. "Die Versohlußblätter are longer and wider than the copy sheets, so that they have the copy sheets all around the periphery of the iaketes tower above. The baran leaves Lind at H are hot-welded along their marginal edges, making them a closure for Form the package to prevent leakage from the sensitized leaves until they reach the Ready to use. The .h.rt of reading plastic sheets, which are closed around their marginal edges are, 2wiping the copy sheets results in a closed Pocket 15 for each copy sheet. When using will the uppermost package, forming Hlatt 12 of the one above. Copy sheet is stripped off and the copy sheet, held by the remaining package, is immediately printed onto the Surface applied, νcn ier made the copy v / earth :: should, liach some statements is the picture in that sensitized iilm 13, as just described ur.d the top / Zcpierblatt is from the. Package removed, The remaining copy sheets remain closed Condition in their individual, lash until they

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ready for use.

^ acli of another embodiment they cannot sensitized but opaque mowed ICopier sheets in a distributor with a humidifying roller or the like is packed through which the copy paper passes, when it is then distributed to each sheet with the sensitizing fluid to moisten.

The copy sheet itself is preferably clear so that there is an unreadable image of that of the sensitized Surface opposite side can be observed. The sheet can be a plastic, glass or an elastomeric ' Be material. It must be impermeable to the liquid with which the film is moistened, so that the liquid vapors e migrate away from the damp leaf instead of being absorbed into it, ü a surface can be such that it can be made opaque by contact with a solvent and subsequent rinsing with water, or, according to another embodiment, an opaque coating can be applied to one surface the copy sheet v- forms the base for the opaque coating. Suitable substances for use as

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Copy sheets are glass, polyethylene, cellulose acetate, oaran, polystyrene (Irioyte) polyester (i.:ylar) and polypropylene. The opaque or porous surface film on the copy sheet can consist of lenses, prisms, watchmakers ^1. , Lilas, fibers, holes, crystals, drops and the like. The film is preferably thin, ie in the range of 0.25 to 15 microns, preferably in the range of 5 to 10 microns. At the lower limit, the film must be thick enough to contain light scattering non-uniformities. The optimal size of such bumps in homogeneity he. is about 1/4 Mikiiron. furthermore, since it is technically impossible to deposit a coating of absolutely uniform thickness, the deposited coating should have an average thickness which is large enough to give an assurance that there are no pancake sites which are below the absolute minimum thickness. However, the iilm must also be thick enough to retain sufficient moisture for at least the time required to carry out the working stages of the process, i.e. it must not become too dry during the time in which it is tampered with in order to allow it to remain on the laid on the printed sheet and, after it is applied to the printed sheet, it must retain sufficient moisture to carry out the collapse and collapse.

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ie :, u: ei a reaction or 3-month combination of the kind the procedure by means of ;; running.

La _k -ibX no techniaoh _t ; exact upper limit for the ^ iüji'i dea .tilciea, but important} practical relocations meet. here au. It is desirable that i'ilm thin.-ι! .old, u ... a translator of more all the necessary .. ♦ Ji. _t .ö at-.Bibilisieruni sfli.liquid to be avoided, .ura under ariderer. ü.; j. eu prevent the print sheet from being puffed up on it, we pucker. I erner is, ie the optical ^ ■ to change ensoiiaften dee Filaes radical, neces- · agile, to substantially and vollattindij duroh _{t is} the thickness of the film: to change üine - "edin ^ ui.g! which is achieved with certainty when öer FÜli is relatively thin. In addition, nei ^ t, v.ei-ii dor PxIe to. is thick, the large amount of moisture in it tends to reduce the sharpness of the image, and finally, the thicker it is: the longer is the time required to produce the complete image. It is preferable that this length of time be on the order of 10, since this is short enough for practical purposes and for easy immunity.

The pin must be sealed in a suitable solvent -, / can ground to its optical properties

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change. Examples of suitable film materials are cellulose acetate, Cellulose nitrate, ethyl cellulose, polyvinyl chloride, polyvinyl acetate, and polyvinyl acetate-acid anhydride copolymers. As indicated, the surface film can be produced by treating the backing sheet with a suitable one Solvent, otler in another embodiment may the film can be formed by applying a coating directly to the sheet.

There are three basic criteria for the solvent according to the selective solution theory. As the first criterion the printed sheet must have a markedly lower affinity for the solvent than for water with which the solvent is mixed. It is to be understood that at the preferred embodiment is water as the selective solution

dag / is used as a carrier with which / solvent is mixed for reasons of its chemical inertness, its affinity for cellulose fibers and of course because of its cost. The selection from another carrier with a different affinity for the cellulose fiber compared to the solvent would of course also fall within the scope of the invention.

The second criterion is that the solvent must be able to solvate or otherwise solvate the opaque film

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009886/0332

to react with it.) to make it transparent or to change its character in such a way that parts of the fumes on which it acts are easily recognizable from parts which. show no activity. The solvent should preferably have a strong odor, but if there is one. If it has a smell, the smell should be as harmless as possible. Usable solvents are butyrolactone, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol monoethyl ether, dioxane, the pentanones, glycerin trimoetate and propylene carbonate (with a solubilizer of ethylene, for example alcohol), or a propylene carbonate (with a solubilizer of ethylene, for example, alcohol) such as alcohol or a glycol ether), isbpropanol, ethanol, K-Methy1-2-pyrrolidone, acetic acid, tetrahydrofuran and the like. . ' ^!

A third criterion is that the solvent einie

I I

high evaporation rate: opposite the Waeair points out, so that when drying in the air, the solvent never reaches a single concentration that causes would make the picture disappear.

.

Main version form. J

In the execution aform selective solution was a

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Multi-component system for moistening the copy sheet described. One of the components is a solvent and the other component is an inert liquid carrier, eg water _t for the solvent. It is suggested that the printed sheet has a strong affinity or absorbency for the carrier liquid so that when the copy sheet is brought into contact with the printed sheet, the carrier liquid in the printed sheet is absorbed to a greater extent than the solvent , in the areas overlying the non-image part of the printed sheet and as a result the solvent will act on the film to make it transparent.

The main embodiment is! a humidification substance consisting of several components not necessary in every pallet, to create images. Rather, images can also be generated if the moisturizing substance is a single one is fluid that is capable of maintaining the optical properties of the films »and the liquid can make the best of water ·

According to the main embodiment, the copy sheet,

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1S71B26

that for the moisture compared to the printed sheet Relatively undurohläeeig 1st, a thin film on aeiner Surface on. The thin film is able to keep a self-sufficient fluid from being eurüOkeuhaltiÄ and is able to change some optical effects due to the moisture.

The IiIm is moistened and while it is still feuo. lsi, if it is brought against the printed sheet, deeeen -

Image should be reproduced * The print on dta sheet gives a state whereby the printed sheet has different moisture absorbency the image part and the non-image parts. When the moistened film is held against the printed sheet for a short time and then removed, «is produced in image on the film.

The exact mechanism by the phyeikalistfhen as in the case of "selective solution" as a design Properties of the film can be changed to a picture eu ' produce is not fully known. These theories for the creation of images can be certain empirical determined conditions are specified

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The impermeable backing sheet on which the film is formed, and with which the film represents the copy sheet in the preferred i'orm of the invention, is said to be transparent its for the image that is produced as a mirror image of the printed sheet and can best be seen through The back of the document sheet can be viewed # Suitable materials for the document sheet are glass, polyethy *. len, cellulose acetate, baran, polystyrene, polypropylene and similar"

The film on the copy sheet is a substance that is able to retain the moisture of the sensitizing liquid and is able to change its optical properties fundamentally through its moisture to 15 microns, preferably ίκ. Range from b to 10 microns. These widths and preferred thickness ranges are more largely dictated. Due to the same and technical reasons as they are related to the films that are useful in the "selective training" embodiment, as described above.

Suitable films are organic polymers such as polymers, polyearboxylates and cellulose compounds. Special accessories

Bath 009886/0332

games are a copolymer of polyvinyl acetate and crotonic acid, a mixture of ethylene and maleic anhydride copolymer and vinyl acetate! Cellulose nitrate and Cellulose acetate butyrate.

The sensitizing liquid is preferable V / ater. Water not only gives the desired result the change in the optical properties of the selected film, but is also colorless, odorless, not poisonous and does not adversely affect the printed sheets exposed to it. Of course, water can are mixed with other substances as disclosed in the "selective solution" method or substances that the surface tension or rate of evaporation influence.

Sensitizing fluid can also be non-aqueous be liquid organic compounds, such as oxygen-containing organic compounds, e.g. * B. 2-ethylhexanol, Propylene glycol and hexylene glycol. There are also signs that subllmi.erende substances are effective as sensitizing media could be.

The amount of sensitizing fluid that is on

CÖ9ÖÖ6 / U332

the PiIm is applied should be just enough to cover the Moisten the film continuously and without exceeding the moisture in the form of droplets on the surface of the film. For example, moisture should remain after a film is moistened and then extinguished to remove any free standing water. Agreement the reproduction of an image according to the present invention can be aided by FIG. 5, which gives a schematic explanation of the method, "as shown in the drawing" contains a copy sheet 20 an impermeable backing 21, a film 22. The Xopier sheet is used to reproduce an image 23 that is formed in or on the surface 24 of a printed matter Sheet 25 · Bas process involves a diffusion of Moisture or vapor of the sensitizing liquid from the film onto the printed sheet, as stated above » When performing the normal procedure vnLrd the copy sheet against the printed sheet with the film 22 held in contact with the surface of the printed sheet. Ifrner under these circumstances, the copy sheet only contacts the printed sheet for a very small percentage of its area the roughness of the printed sheet surface. To demonstrate the fact that the process involves steam migration, the procedure was carried out by removing the copier

000066/0332

1571828

Separates sheet from printed sheet by i'rennstücfce (shims), ÄLv et-sa ϋ, α / 7 inches thick, in order to separate the sheets from one another by this space zxx .

"As indicated, the moistened 3J ¹ um of the copy sheet is held against the printed sheet for a short time, for 2 to 3 seconds." which are above the image and open image areas of the printed sheet are ν. aider η can. After the short period of time, the copy sheet is removed from the printed sheet, and a picture, Ij, appears on the film of the copy sheet; in some cases the visible image is reproduced, while the copy sheet is in contact with the printed sheet

a latent image is formed, the _r: ach ier 2rennung of the copy sheet from the printed sheet is visible permanently course ·

Depending on the conditions of the procedure the image generated by the process can be a positive one, as indicated at A, or a negative one, as indicated in B. The term positive means related on A, caß the picture areas, indicated at 28, relative

009886/0332

are opaque, and the face image areas, indicated at 29, are relatively transparent. The term negative means, based on B, that the image areas, indicated by D, at 30 are transparent and the non-image areas are relatively opaque, as indicated at 31.

Example 31

A copy sheet was produced by coating a biaxially oriented polypropylene film with a solution of polyvinyl acetate glutonic acid adduct containing about 3 % crotonic acid in a solvent mixture of 130 ml of denatured alcohol, 450 ml of acetone and 50 ml of water. After the coating dried, the copy sheet was immersed in water. The film was then wetted, then erased, free of excess moisture. The wet coated surface of the copy sheet was then brought into uniform contact with the printed sheet for about 20 seconds. After the copy sheet was removed from the printed sheet, a permanent mirror image was reproduced on the coated side of the copy sheet, corresponding to the printed object on the printed image.

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Example 32

A sheet of biaxially oriented polypropylene was treated with a solution of one part by weight of ethylene in maleic anhydride Coated with copolymer, 2 parts polyvinyl acetate resin and 4 parts water in acetone to make up to 100

The dried leaf was immersed in water for five to 10 seconds, bled, and swirled until free was of excess moisture. & s became.immediate 5 seconds pressed against a printed book page and the Exposed to air until a consistent positive image is developed, which took about 20 seconds. - ^ in another piece of the coated film, in the same way humidified and swirled, was exposed to the air and then brought 20 to 30 statements into contact with a printed document. It became a permanent negative image obtain.

Example 35

A sheet of polystyrene was mixed with a half-length solution of cellulose nitrate in a mixture of solvents

- 42 - BAD ORZGfN) HL

009886/0332

Coated methanol and acetone in a volume ratio of 4s 1 and then dried «JJa3 coated sheet was dam. etv / a 10 seconds in an aqueous 5% solution of ... ethylene carbonate ;, immersed and then about 20 minutes ir. with an absorbent Paper towel extinguished. The damp coated surface was then in uniform contact with one Glass plate brought, one of which with a. Piece of paper was covered. liach 30 seconds of even contact; .iit the grass and the parry placed on it was covered Polystyrene sheet removed and exposed to the air. The surface of the coated paper that is opaque over eggs. jlas lay, v / ar opaque al3 the Ii ^ cLe, which lay over der.i Papi-r

Example 54

i £ in I-olystyr -lblatt wurce ciit cellulose nitrate ν / ie i; r. Example ^ 3 coated. The coated leaf was then immersed in a 1C ^. ^: i _; {e aqueous solution of Butyrolaoton, rr.it a Pa: ierhandtuch abgelcsci t and then genalten in uniform "contact with an aluminum sheet of a Cen - ■ eil rr.it eineia piece of paper covered v / ar _e

I.'acV. about 3C express 7 / urde the coated polystyrene

009886/0332

Ι ... ίίΐ-w ^ r '/ ar.ciUiör. and exposed to the air. The surface that was "i.er : hT uivurchlaasij en Aiui.iiniumflache" was opaque, al .: diy Plücra, which dei .. raj ier was exposed.

Li: over i'.up-eres Pci. styroütlatt was made v.iü:.: .. • ■ 'eiaiiel ^ i. The ücer.iCfjone Pci ^ atyrclblatt was eau. about U; ielcur.deη in a S.'it'e wüßri (e reading of Λ-ti.yIcarbonat dipped, from _{ '.elöBcl: t and then about 10 3e-.iiu.der. den: Alua: inium- Paper surfaces exposed as in the first place. Laughing and exposure to air, the curses of the coated sheet _for the bbex of the undu, r.eJü, lässißeii AluKiniuino surface lay, more opaque than the area that lay over the paper.

Example 36

A sheet of polystyrene was made with a 2 ^ igen solution of carboxylated polyvinyl acetate (Yicol 1260 from Colloids Incorporated) covered. The solution was prepared by mixing 3 g of copolymer, 10 ecm of ethyl acetate, 10 ecm Wetter and sufficient ethanol, uo the solution to 15C ecm

- 44 -

009886/0332

to replenish * Zfaclidem the coating was dry »he was white and translucent »The coated sheet then became Wiped off with 2- ethylhexane and excess liquid was removed by quenching, the coated sheet was then brought into uniform contact with a printed sheet of paper for about 1/2 hour. The sheet and that printed paper was separated and there was a legible negative image of the print on the coated polystyrene visible"

Case 3?

Example 36 was repeated with the difference that an aluminum window frame was placed between the printed paper and the coated polystyrene sheet * After about one hour and 10 minutes the coated sheet was removed and a visible picture of the print and the frame was produced on it "

Example 38

A polystyrene film was made with a solution of vinyl acetate butonic acid copolymer like II example 31- coated.

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009 886/0332 bathroom

1571829

The film was then featured on its coated side Wiped off propylene glycol. Then it was extinguished until it was free of excess liquid and up a printed paper document placed for about half an hour. After removing the -tOlystyrene film was one visible image reproduction of the printed object recognizable when the film was viewed at an angle «

Example 59

The procedure of Example 28 is repeated with the following: Deviation that two strips of metal 0.007 inches thick; between the printed paper document and the treated one; Film were placed. The printed paper was *; prevents the coated polystyrene film from touching the surface by laying the paper in a smooth plane kept at a distance from the film surface. After about 2 hours, the film was removed and then viewed at an angle an image reproduction of the printed item was visible.

Example 40
• A sheet of polystyrene was covered with a reddish one

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0 0 9 88 6/0332 bad ο

1571828

Cellulose nitrate varnish according to Example 33 and dried. That Sheet was then dipped in eexylene glycol, and the excess The liquid was extinguished. The coated ϊϋιη was then in uniform contact for about 7 hours brought with an aluminum foil, part of which was covered with paper. L'aoh this since was the area of the The coated sheet that was exposed to the aluminum was »more transparent than the surface that was exposed to the paper was

Example 41

A polystyrene sheet was coated with a reddish varnish of cellulose acetate butyrate and dried until to an opakeji state. The sheet was then turned into a solution of 10 parts by volume of G-lycol acetate in 90 parts by volume Dipped water until it showed uniform, visible opaque drops and thus a saturation, at about Displayed 10 to 30 seconds. The excess liquid was wiped off, and the wet film was about 15 minutes held in contact with a printed book page. It a readable positive image similarly resulted, even improved results obtained when used a 7 1/2 solution of glycol diacetate in water.

- 47 -

009 886/0332 bad W

1571825

Example 42

The procedure of Example 21 is repeated using a film which was coated with a reddish varnish of cellulose acetate, and a legible positive image resulted,

. Example 43

The procedure of Example 41 was repeated using a film with a reddish I was covered in cellulose nitrate Truck was held in contact for 5 to 10 seconds. The result was a readable positive image «

Example 44

A polystyrene glass was mixed with a solution of 4.5 g of polyvinyl acetate in 45 ecm acetone, 75 ecm!.! Ethanol, 10 ecm G-lycerin and 10 ecm dioxane and 5.5 ecm V / water coated and dried. The film was soaked in water, and after wiping off the excess water behind

with / remained a damp film. The film was brought into contact with a printed book page for a few seconds, and

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009886/0332 _BAD or _: gihal

1571828

faint but recognizable images emerged.

Example 45

A polypropylene sheet was filled with a solution of 6 g of polyvinyl acetate glutonic acid adduct containing about 3 ','' crlutonic acid, 0.5 g of carboxypolymethylene resin (Garbopol from 3. Goodrich), dissolved in 1.0 com of diethylene glycol, 30 ecm of methanol and acetone to make up coated to 200 ecm · The coating was dried and then moistened with water. The wet coated surface was held in contact with a printed sheet for about 20 seconds, resulting in a recognizable positive image. The image was actually formed by an increase in the opacity in the areas that lay over the image parts on <3era printed sheets, with the exposed image areas remaining soled or translucent.

Developer execution

The foregoing has been a description of what is considered to be one of the two practical implementations of the invention from the standpoint of simplicity and ease of work. The following is a description of one

- 49 - ^:

009886/0332 bad

other embodiment of variations that too much satisfactory reproductions from the aesthetic. Standpoint »but they have a separate stage of development, usually require with a liquid developer »

In the developer version I use is made of the principle * those in the "selective solution" and in the E main embodiment is shown, namely an ICopierblatt, which is attached opposite a printed sheet, and in which the two sheets have different moisture contents exhibit. The moisture moves without a special supply of electricity, heat, light or the like from one sheet to the other in the non-image part in to a greater extent than on the picture surfaces.

In a first of several variants of the developer embodiment an impermeable base sheet is provided, equipped with a thin porous film that!

activity and a reactive chemical compound (a Developer, reactant). The treated surface des, copy sheet βθ then becomes a sufficient time held against the printed surface to enable

that a selective diffusion of moisture takes place *

from which drying out in the ftiohiibildfläohen results _r

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'' 008886/0332 bad original

while the image areas remain damp · The copier rail is then developed / by giving the film to a developer exposes so that the developer penetrates the wet image areas to react with the developing agent. the preferred soaking and reaction of the developer with the developer reagent in the damp picture areas creates the image. This form of developer execution will is most easily demonstrated by placing a porous film on top of a transparent opaque base film Formation of a copy sheet attaches. The porous film will made sensitive by moistening it with an aqueous solution of an acidic substance, for example salicylic acid. The moistened film is held against a printed cellulose sheet until the moisture is below it the IJichtbildflflächen the printed sheet is more selective migrates into the printed sheet, but the surfaces of the film, which printed res over the image areas Sheet, left in a moist state. .

The copy sheet is then exposed to a developer, which is a color-forming substance compatible with the acidic Material reacts, the developer containing an inert liquid carrier. The reaction takes place in the most of the time damp surfaces instead of »which allow the coloring" ■ *

..., 000886/0312

1571828

forming substance migrates through the porous film and reacts with the acidic * material in the film »

In another variant, any need for handling solutions that could be dangerous for documents and personnel eliminated, the copy sheet is produced, by making a porous film with a developing Eeaktionslomponente generated on the surface of an impermeable base sheeta. Taoh this procedure will be suitable inorganic porous films containing water-insoluble acids on the surface of an impermeable Base formed. These films can be produced, for example, by using acidic ion slurries - ■ «entonite or kaolin and the like, on glass, aluminum and the same applies or sticks. Hack another Ausfükrun ^ t? Forti the acidic inorganic compounds can be applied to any suitable surface using conventional adhesives be glued on. The copy sheets can then be observed and exposing the printed surfaces as described above and then a developer a'aa ^ eset ^ t be that in the damp areas with the acidic btoff in the porous film, forming a visible image reacted.

8AD

009886/0332

Similarly, acidic organic polymers can be used to make the porous film impermeable to generate underlay. Acid polymers, the ones that are offered for use for the Ion exchange, thickeners, alkali-dispersed adhesives and the like are suitable

A third variant for training a »impermeable Backing sheet with a porous film, moisture and a reactive chemical compound contains, that is, a development reaction participant, is within the execution form with developer, iiach In this procedure, the surface of a suitable impermeable film, e.g., cellulose acetate, cellulose nitrate and the like swollen and treated with a solution of a reactant for the developer, e.g. 85, phosphoric acid or iissi ^ acid, salicylic acid or the like made porous. The i-'ilm will then subjected to a controlled rinse with water, go daii the necessary ..concentration of .'üiure remains, and will be extinguished free from übercLüwaigeia V, 'ater in order to receive au a moist, acidic porous film on an impermeable surface. This can be developed in accordance with the working procedures outlined above.

0098 86/0332

In a fourth variant / the embodiment with developer, an extremely thin porous film on an impermeable base sheet is moistened with a liquid, such as water alone, and placed on a printed sheet. The sheets are held together until selective diffusion occurs which causes the copy sheet to become relatively dry on the non-image areas while remaining moist in the image areas. The copy sheet is immediately exposed to a developer composed of a substance or combination of substances that react in the presence of moisture but do not react in the absence of moisture after forming an image, e.g. an acidic reactant such as salicylic acid and a thinner, For example, Leükobase can contain an auramine dye, color precursor I <r >> 1 from Allied Chemical Corporation, as described in US Pat. No. 2,981,733 and further described in US Pat. No. 3,079,271, dispersed in an inert carrier liquid, for example toluene or be resolved. The reaction between the acid and the color former takes place in the presence of water as moisture and produces a purple colored image on the copy sheet _e

The special substances involved in the development of

009886/0332

Images on the copy sheet, depending on the form of execution Developers used allow a considerable amount of time Variation, for example, in the first variant of the execution form with developer, in which the porous film of the copy sheet an image of moisture and a reaction compound (Reaction developer) contains, des- development it is preferably any chemical compound a color-forming substance that reacts with the developer in the wet image areas to create a visible one Image of the developer participant used

In one of the easily practicable i'Orms of the invention contained the developer participant in the porous surface film an acidic compound, such as salicylic acid, acetic acid, Phosphoric acid, phthalic anhydride, formic acid, citric acid, or acidic salts such as iiatrium dichromate, sodium bisulfite, acid sulphates, aluminum sulphates, aluminum chloride, S'errichlorid and the like. Alkaline substances can also be used instead of the acidic substances, e.g. calcium hydroxide, Sodium Carbonate, Liatrium Acetate, iCalium Citrate and Alkali borates »Any color-forming substances can be used are used as developers with these basic and acidic For example, a leukoba-ae of an auramine dye, ii'arbvorläufer Hr. 1 of the Light Chemical Oor- *

009886/0332

poration, and the like. It is of course clear that the listed substances, which are used as reaction participants, can also serve as developers and vice versa a substance in the porous film associated with a;:. Is reacted Lntwickler, the v.ird applied was exposed to J. ^A ilm, nachdeia the Piim a li'euchtigkeitsfusion under contact with the printed I-latt.

In the fourth variant of the embodiment with * intv.lekler, the "porous - ^{% 1} ilHi des; ^ opierblattes rait" water is moistened alone and the .fiitwicklermedium contains a substance oc.er a jvoi-ibination of substances that are in Presence of - • ■ euclititjjieit react, but not when they are missing. "He described above: ': is, so"a;: suitable development rnediu ... a .ernisc]: from saixren to be, like iialicylii'Jure and -i ^' work before runner .-. R. 1, the, didiier ^ iert in toluene, the ii. Js.-ei v.'art des feucl; th "water picture" under :: ilduii._ of a purpMrg-jfL.'bten picture on the surface of the iCopierulatte.3 reacts. V.er.n ^ leich an oheuische ".; Action in ü-e ^ er-vart by j ^ euciiti ^ -ceit \ viln8Cheri.s' ..- ert is, su she is ^ edoci i not notv / endif -. Y.um ^ eisiiel ^ ann a dye in

009886/0332 bad original

suitable solvents to be dissolved that the dry or even surfaces showing evidence of an image discolored »

It is preferred to dissolve or disperse the developer in an inert carrier liquid. In such a 3? Orm the developer should accordingly soluble Ain in the humid screens and in the inert .Trägerflüssigkeit to prevent diffusion of the developer in the wet image surfaces to allow to react with the Intwieklerreaktionsteilnehmer · Menn only a damp image as Wasserfeuqhtigkeit alone, is formed, but lacks a developer reactant, the reactant in the presence of the wet image will react to discolor or stain the korjierblatt. The inert carrier for the developer should have almost no solubility for the moisture in the wet parts of the image, otherwise it will absorb the moisture on the image before the image is formed. Suitable inert carrier liquids are ζ £. aliphatic and aromatic hydrocarbons, such as fluorescent oil, Y / eiiscl, benzene, toluene and other petroleum hydrocarbons, substituted hydrocarbons, such as liquid halogenated hydrocarbons, for example the prones, such as 1,1-dichlorotrifluoroethane, 1,2-dibroxutetrafluoroethane, 1,1, 1-

- 57 009886/0332 ~

1571828

Trialilorpentafluoroethane, 1,2-difluorotetrachloroethane, • perfluoro dime thylcyclobu tan and similar, as well as halogenated ones aromatic hydrocarbons, e.g. halogenated benzene, Diphenyl and the like β

By exposing them to a gaseous developer, the development of the wet images can be achieved, and this avoids the need to distribute the developer in a liquid carrier, for example when there is the .'t development participant in the damp image areas the diffusion of light is formed, a color former like s.B. a leuco base of an auramine dye, iarb precursor i.r. 1 from Light OheEiical Corp., from the vapors of an acidic Undevelopers, such as hydrochloric acid, formic acid, acetic acid, chlorine and

BAD OFUGINAL 009886/0332

similar and they react with it to produce a finished image. Vapors from react in a similar way basic developers with a development participant on the surface of the copy sheet, e.g. ammonia vapors react alt a copy sheet, the surface of which is colored blue with a mixture of salicylic acid and the color precursor No. 1, and wherein the dye is bleached in the wet image areas.

The backing sheet of the copy sheet, as it is with the Embodiment used with developer can be any impervious material. Sa the picture that is communicated to the surface of the copy sheet, is a mirror image reproduction of the printed area, is the sub-If sheet preferably transparent. The backing sheet should preferably be so bonded to the porous film surface It can be found that the porous film surface cannot be easily removed. E.g. the backing sheet made of plastic, Consist of glass, rubber or the like. Suitable examples of plastics are polyvinyl chloride, polyester, (Mylar), polystyrene, polyethylene, vinyl vinylidene chloride polymers (Saran), cellulosic polymers, polyacrylates and the like.

The porous film can be firmly formed together with the backing sheet, e.g. B., in which cellulose acetate exposed to a solvent such as acetic acid in order to

009886/0332

area of the backing sheet to swell, and then the Acetic acid washes off the surface, creating a porous discontinuous sheet of cellulose acetate.

According to another embodiment, the proaβ can be formed by applying a coating to the base, the I ¹ IIa consisting of a thin layer of colloidal organic or inorganic material *

Examples of suitable porous pilsen are

1) regenerated cellulose, »is simply produced in * very thin layers by superficial hydrolyzing cellulose nitrate, cellulose acetate butyrate and the like;

2) organic colloids such as gelatinized polyvinyl alcohol, polyvinyl pyrolidone, pectin, ouar gum, casein, carborymethai · cellulose, hydroxyethyl cellulose, alginates, lignosulfonates and similar*

3) inorganic colloidal substances, such as hydrolyzed ethyl * silicate and similar forms of polysilicic acid, colloidal Silicic acid and silica gel, hydrated oxides of aluminum * minium, and iron, copper, zinc, zircon and similar, ferrocyanide, bentonite, carbonite and similar

4) Soaps and surface-active substances which are capable of forming mycelia or coalservates which have suitable permeability *

BAD ORfGlNAL

009886/0332

The moist medium that forms the image areas on the copy sheet by selective diffusion in or out the non-image areas of the printed surface is preferably water, although other solvents or Solvent systems can use. As discussed, can Water alone or water that contains a reactive chemical compound that dampens the developmental Forming image areas «Water is preferred for several reasons because of its low cost, its ability to through Cellulose absorbed to an extraordinary extent its harmless effect on printed paper and on the staff and its price on anything disturbing aroma.

The examples below serve to make the implementation of the embodiment with developer of this invention, but should not be taken as limiting thereof.

Example 46

A sheet of cellulose acetate was 10 minutes Treated tree temperature with a bath containing 100 ecm dimethyl sulfoxide, 40 ecm water, 10 g salicylic acid and 5 g dioctyl sodium sulfosucclonate. This treatment left the Swell the surface of the cellulose acetate. The cellulose acetate sheet was then rinsed with water for 5 seconds and with

009886/0332

Blotting paper dried off, free from superfluous liquid. The sheet that has no on its surface Visible liquid was allowed to dry for 5 seconds to remove any tack and then it was brought into contact with a printed sheet of paper for 10 seconds. The sheet was peeled off from the printed one Paper and then simply in a 0.5 percent solution of a leuco base of an auramine dye (color precursor no. 1 from Light Chemical Corporation) immersed in kerosene. Bs developed a deep blue positive image on the cellulose copy sheet in about 15 seconds and this was done by drying off the excess kerosene on a further development prevented. fCh Bas image on the surface of the cellulose acetate copy sheet was sharp and readable in deep blue. This image on the surface corresponded to the mirror » image of the printed object on the paper and was correctly read if you looked at it from the side of the copy sheet, facing the treated surface)

!
looked at.

Example ^ 47

A copy sheet made from polyethylene terephthalate (Mylar) with a thin porous film of gelatin was dipped in water and allowed to dry for about 20 seconds to avoid any Eliminate tendency to stickiness. The damp

009886/0332 ^ßAD

The gelatin surface of the copy sheet was then brought into uniform contact with a sheet of printed paper for 10 seconds. During this time, water vapor diffused from the copy sheet into the unprinted areas of the sheet, while the copy layer on the image areas remained moist. The copy sheet was then treated with a solution of toluene containing about 5 $> of the color precursor 1 and about 2 # salicylic acid. An intense purple-red image developed on the copy sheet on the damp image surfaces.

Example 48

A sheet of cellulose acetate was treated for 5 seconds at room temperature with a bath containing 100 ecm of dimethyl sulfoxide, 250 ecm methanol and 50 ecm water, 1 g salicylic acid and 5 grams of color precursor # 1. This solution swelled the surface of the cellulose acetate and colored it at the same time blue. The blue-colored cellulose acetate copy sheet became Rinsed with water for 10 seconds and freed of excess liquid. The copy sheet that has no visible liquid had on its surface, it was then allowed to dry for 5 minutes and covered with a printed sheet of paper 15 seconds in contact. The copy sheet was then immersed in 90 ecm kerosene solvent, the 20 ecm oleic acid and 5 ecm contained 28 percent ammonia. The ammonia was lying in the kerosene solution in a sufficient excess,

bath

009886/0332

to give a distinct alkaline reaction. The alkalinity destroyed the blue color of the film wherever it was damp with water, and no steam had allowed to Hindu diffuse into the printed paper in the printed areas. The resulting surface of the copy sheet contained a picture clear character on a blue ground, the trachtung at B _e could be read correctly from the opposite side of the sheet.

Example 49

A cellulose acetate sheet was soaked in a 5 percent solution of color precursor Hr. 1 into the dimethyl sulfoxide immersed. Bs was then rinsed with water, freed of excess liquid and a few seconds in Brought into contact with a printed sheet of paper. After removal, the cellulose acetate in the copy sheet was the Exposed to steam from hydrochloric acid. Is a deep blue image developed on the copy sheet in the damp areas, where the dye reacted with the hydrogen chloride. The vapor development of the image on the copy sheet according to the above Example can also be carried out with formic acid or acetic acid vapors.

Example 50

A glass plate became 2.5 percent aqueous

009886/0332

A solution of equal parts by weight of poly (vinyl methyl ether maleic anhydride) and polyvinyl alcohol coated by allowing the solution to flow onto the plate and allow the excess to drip off. The coated plate was dried in an oven for half an hour at about 102 ^° C (215 ^° F). Under these conditions there was sufficient reaction between the poly "vinyl methyl ether maleic anhydride" and the polyvinyl alcohol to render the coated film insoluble in water. The coated glass was then immersed in water, stripped of excess liquid, and allowed to dry for a few seconds to eliminate tackiness. The moistened copy sheet was placed in contact with a sheet of printed paper for about 30 seconds and then immersed in a 1 percent solution of color precursor No. in kerosene. A deep blue image appeared on the surface of the copy sheet.

Example 51

A cellulose acetate copy sheet was dyed blue according to Example and with a printed paper sheet according to FIG the same way of working as described there. The image on the surface of the copy sheet was developed by exposure to ammonia vapor instead of liquid evolution, as in that example is described. The result was an image of clear character on a blue background.

009886/0332

Example 52

A glass plate was made with a slurry of 10 parts by weight of kaolin and 5 parts by weight of 85% Phosphoric acid coated in about 80 parts by weight of water.

approximately

The plate was oven dried for about half hour at / 2o5 ° G (400 ⁰ F). This way of working binds the clay so tightly to the glass that it does not rub off when it is held under running water and scrubbed. The coated glass surface was then immersed in water and placed between paper towels to remove the excess liquid. The water-laden surface of the copy glass was then brought into uniform contact with a printed layer of paper for about 5 seconds and then immersed in a developer solution containing 1 $> parb precursor No. 1 in kerosene. The sheet was then taken out of the developer solution and a steady blue image appeared on its surface.

BATH ORIGINAL

009886/0332

Embodiment with image transmission

In the above methods with selective solution ^ The main process and development process becomes an image on the copy sheet by a so-called one-step process created in that an image is transferred from one sheet to another. The transfer in one Step necessarily gives a mirror image on the copy sheet. The mirror image requires use for reading a transparent copy sheet and reading the image through the reverse side of the copy sheet. Using the clear copy sheet is completely satisfactory from the standpoint of obtaining a usable, legible and safe sheet permanent copy of the printed book page, but it is not as easy to handle as paper made from cellulose fibers consists.

The aim of the present embodiment of the invention with transmission is to provide a method for the production of directly readable images on paper. This embodiment is a two-step process in which the Mirror image is initially created by the selective diffusion of moisture, whereupon the image is transferred to paper will.

In particular, in the image transmission method

- Df -

A copy sheet is made by placing an extremely porous thin film on one surface of an impermeable Sheet forms and wets the film, as described in the previous embodiments. The moistened Film is held against a printed sheet until the film is selectively dried out in the non-image areas a mirror image is generated. The image formed in this way, created in the remaining moist parts can be transferred to a final sheet of paper in one of two ways. The first of these will be the copy sheet exposed to a liquid developer as described in Example 46, for example. Immediately after application of the developer, the copy sheet is wetted with the developer solution, the image areas still being wet from your dye through which the easily readable image is created became. While it is still wet, the copy sheet is printed with its wet film side against a final paper until genu ^; wet dye in the image portions of your copy sheet flows into the end leaf to create the image on the end leaf. This form of transfer implementation requires the use of the liquid developer, but it is nonetheless only usable production of a legible reproduction on paper.

The second embodiment: this invention is preferred because they do not use liquid

009886/0332 _DAn ^ ~~ ·

BATH ORIGINAL

Winder requires. This form of the invention uses an end sheet that has a specially manufactured surface covering and a copy sheet, the porous film of which is moistened with a specially prepared liquid, which combines with the coating in the end sheet and creates an image there. In particular, the copy sheet has its porous film is moistened with a special liquid, and the copy sheet is applied to the printed sheet. The film is dried out in the non-image parts by the selective moisture diffusion and the copy sheet is placed with the film surface against the specially coated end paper. The moisture in those left behind Parts of the image diffuses into the coating of the finished sheet, which unites with that coating, being a readable direct image is generated.

In this second form, only the image that is formed in the last stage need be permanent. Hence can the copy sheet can be made more durable than necessary for the embodiments described above is because the porous film can be rewetted and reused as many times as is desired.

This form of transfer design allows a unit to be placed on the market that contains three parts, namely a pack of paper with a suitable covering (end sheets), a plate with a microporous

009886/0332

Film (copy sheet) and means for applying a sensitizing Solution on the plate. The copy plate is usually in a non-sensitized state stored so that the materials can be stored indefinitely. to moisten the microporous plate using the means prescribed for this purpose. The moistened plate is to be brought into contact with the print piece that is to be copied for a sufficient period of time to achieve a to induce selective migration of the sensitizing moisture and then the plate with the in special How to bring coated paper into contact »The microporous film on the plate can therefore be made from a very durable Material such as unglazed porcelain, microporous glass, sintered stainless steel and a very tough plastic of suitable porosity. Its shelf life allows it to be humidified by treating it with a Rub the object of the order, e.g. a sponge, a swab, a wringer of a squeezing instrument (squeegee).

The second form of transmission design allows a large number of variants, which are detailed in the following reproduced examples are described.

The first variant is an extension in one sense the embodiment of selective solution. According to this variant, an impermeable copy sheet with a very

009886/0332

BAD ORIGiK ¹ AL

thin porous PiIm sensitized with a mixture from a solvent and a carrier liquid, preferably water. The porous film does not need to be solvated in the solvent unless it is desired, a permanent, misreadable Image and to generate an image to be transmitted correctly to be read. However, the end sheet must have a thin film, which can be solvated and collapsed by a solvent, and its optical properties must change through such a solution or amalgamation (coalescence).

When carrying out the procedure, the sensitized . Copy sheet placed against a printed sheet, and the water selectively diffuses into the printed sheet in to a greater extent in the non-image parts than in the image parts until the solvent is so concentrated as necessary to solvate the film on the final sheet. The copy sheet is then counteracted for a few seconds pressed the film of the end sheet. During this time, the concentrated solvent evaporates in the light image parts and migrates to the adjacent film areas of the end sheet, around there the film while changing its optical Solvate properties. The concentration of the solvent during application is shown in the image areas of the copy sheet on the print sheet is not changed to a significant extent and therefore the wall exercises

009886/0332 ^σ ^ ₀ ^.

change of the vapors of the mixture in contact with the film of the end sheet does not have a noticeable effect on the optical properties on the film in the image part. So will creates a permanent image.

The second variant is similar to the first in terms of the structure of the finished sheet. The copy sheet consists preferably from an impenetrable pad with a thin porous film of relatively inert material, like clay, porcelain or the like. In contrast to the first variant, the sensitization medium can be a pure solvent or it can be a solvent that is initially concentrated to the extent necessary to make the film appear solvate the final leaf.

The copy sheet is pressed against the printing sheet and selective migration of the solvent occurs between the picture areas and the non-picture areas. The image areas form a barrier against the infiltration of solvents. The copy sheet is held against the print sheet until evaporation and migration have progressed

of the film / is as necessary to cause drying / on the copy sheet in the non-image part. The copy sheet is then placed against the film of the end sheet. In the film areas, the solvent evaporates and migrates into the film of the end sheet and solvates it, changing the optical properties. In the high-image part, however, is

009886/0332

the film of the copy sheet dry or at least so dry that evaporation and migration of vapor of the solvent is insufficient to remove any To exert an effect on the film of the final sheet.

The second variant is principally distinguished from the first by the fact that there is no relationship for the selective uptake of carrier liquid (water) through the cellulose of the printing sheet is given to the Concentration of the solvent in the sensitizing mixture to increase.

In a third variant, the end sheet has on one its surfaces have a first coat of one color, at times one insoluble, and one surface or end coating or skin which is thin, but the dye dei ^ Cjt. The top coating [can be, for example, a standard pigment and binder such as are known for coating paper. It will it is preferred that the dye be insoluble so that it is not affected by the application of the topcoat, the normally applied in an aqueous dispersion so that it is not affected by high humidity conditions will.

The copy sheet is as in the first embodiment built up and is sensitized to the dye by a solvent. The copy sheet is against the print sheet

009886/0332

held until the solvent evaporates and migrates into the printing sheet so far that in the non-image parts practically all of the solvent is released from the copy sheet. In the image parts this is prevented by the print image The barrier that forms a release of solvent. The copy sheet is then placed on the end sheet and the solvent, that remains in the image parts, evaporates and migrates through the porous cover layer in contact with the color layer of the end sheet. The paint layer dissolves on contact with the solvent and diffuses through it Cover sheet and causes a visible discoloration according to the generated image.

In a fourth variant, the end sheet contains a dye former. The dye former can be applied by using it as part of a sizing agent (tub-size) as part of the topcoat or by spreading it on the surface of the paper. The copy sheet is formed as in the above variants and with a solution of a substance that reacts with the dye-former. The copy sheet is placed on a printed sheet until the over the non-image areas of the print sheet

be relatively dry over / lying surfaces while the / the printing areas or image area lying surfaces remain relatively moist. The copy sheet is then placed on the end sheet, the reactive compound migrating into the moist image areas and reacting with the dye-forming agent in the end sheet, with an image forming on the end sheet.

^Stands * 0 0 9 8 8 6/0332 _{βΛΠ r} . "

A fifth variant is similar to the second, with the difference that the mechanism for generating it of the picture is opposite to that in the second variant. Covering creates a clear varnish on one dark base. The copy sheet is sensitized with a liquid that solvates the varnish like Alcohol and water. The copy sheet is held against a print sheet until the areas above the non-image part are relatively dry, while the areas overlying the parts of the image remain relatively moist. That Copy sheet is then pressed against the end sheet and the sensitizing liquid in the image areas is evaporated and wanders into contact with the lacquer, which swells and appears white against the dark background.

In a sixth variant, the image is transferred by physically peeling off a surface either from the copy sheet or the end sheet to form an image. For example, the copy sheet with a Film that adheres to a specially prepared surface.

The film on the copy sheet is moistened and pressed against the print sheet until the area over the non-image parts of the print sheet is dry and the copy sheet is then pressed against the end sheet so that the remaining moist parts of the image stick to the end sheet and stay there? when the copy sheet is peeled off.

009886/0332. BADORiQlMAL

The film on the copy sheet should be colored and that End sheet w3 <eß, so that a positively colored image on a white background appears. The principle can be used in the production of films for the copy sheet and end sheet, with only the dry areas of the copy sheet adhering to the end sheet, after transfer resulting product is a directly readable negative.

In another embodiment, the process can be reversed by making an end sheet with a severable Film that adheres to the copy sheet depending on either the wet or dry surfaces from the composition of the respective films adheres to the copy and end sheets. Of course, the transferred Coating white or colored or can contain a dye or an oily mass to make stencils (spirit duplicating) or to create a lithographic pattern. Similarly, if any of the leaves, of which the coating is peeled off, consists of a porous base, as a mimeograph stencil (mimeograph stencil) to serve.

In a seventh variant of the transfer embodiment, an image is created by selectively dispersing a dye produced by diffusing or permitting it to migrate into a film on which it is applied by creating a state in which the film induces selective migration. In the loading

009886/0332

BATH

is Sonderen when a document sheet with a dye-receiving film, for example gelatin, is polyvinyl alcohol or polyvinyl pyrrolidone Coated and again with a relatively concentrated Farbstoffläsung, preferably in a solvent which does not swell the support appreciably before d _a s solvent is evaporated, is coated. This surface covered with dye can then change its optical properties if, for example, its image areas are exposed to water or another liquid which swells the film and thereby enables the dye to diffuse into the film. In one embodiment of the eighth variant of the invention, a non-colored film can be exposed to a vapor which changes its permeability in the image areas and therefore allows a dye to flow through the film and allows the dye to enter the film only in the image area. or non-image parts diffused. This approach is less attractive than the first dyeing of the film because it requires the application of a liquid dye after the image is first formed on a copy sheet.

Thus, in the preferred form, the end sheet could be prepared as described by applying a dye receptive film to a suitable backing sheet by applying a dye to the film. As previously described, a copy sheet is made by forming a very thin porous film on top of an impermeable one

BATH 009886/0332

Backing sheet prepared, see Example 53 · The film is moistened with water or another suitable liquid and is applied to the printing sheet for a sufficient amount of time Period of time is set to allow the liquid to evaporate and migrate into the printing sheet in the non-image portions and maintains a moist state in the film in the areas overlying the image parts. The copy sheet is then placed on the end sheet and the moisture migrates in the image areas into the dye-bearing film on the end sheet, which allows the dye to be dispersed in the film and thereby the optical properties to change on the surface of the end sheet only in the image areas.

Example 55

A A polystyrene sheet was made with a 1 percent solution of 2 parts by weight of polyvinyl acetate and one part by weight GantreziH 119 from General Aniline and Film Corporation, i.e. coated with poly (vinyl methyl ether maleic anhydride) " dried in acetone and to an opaque surface. This procedure gave a final sheet.

B A solution was made by mixing 3 g of cellulose acetate butyrate, 0.75 g Carbopol 934 in 30 ecm methyl acetone, 90 ecm of methanol and 60 ecm of acetone produced. This solution is applied to one surface of a polypropylene sheet by dipping the sheet in the solution. The above-

009886/03 3 2 bad o ^ w

pulled sheet was dried to a "sintered glass" with opaque surface.

The coated polypropylene glass is then packed into a yaf Sensitizing solution of 5 percent by volume each of propylene carbonate and isopropanol immersed in 90 percent by volume water. The sensitized copy sheet is left on for about 15 seconds after the excess liquid has dried off a paper print sheet is placed. After the copy sheet is removed from the print sheet, it is then in uniform contact with the end sheet made according to the method of A above. A directly readable image remained on the End sheet.

A glass plate was coated with a suspension of 10 parts by weight of karolin and 5 parts by weight of 85 percent phosphoric acid in about 80 parts by weight of water. The plate was dried, and (F ⁰ 400) for one half hour in an oven for about 205 ° C to form an adherent porous coating.

The coated plate was washed well to remove free phosphoric acid and then treated with a Sensibili _o sierungslösung from each 5 percent by volume of propylene carbonate to and isopropanol in 90 f> water. After leaving

ο »drying the excess liquid, the sensi-

^ - bilized plate 10 Mimten placed on a sheet of printed paper £ . After removal, the glass plate was against the

End sheet made as in A above. fy _v A hard-to- read image was left on the end sheet. '^ v

In carrying out the work steps as set out in paragraphs B and C, it was found that in in some cases, the optical properties of the non-image part in the end sheet are changed to be a positive one result in a directly readable image and in other cases the optical properties of the image areas are changed in such a way that they result in a directly readable negative image on the final sheet. In the latter case, it appears that the sensitization solution, which was applied to the copy sheet, when applied to its printing surface, dried so far that insufficient sensitizing solution remained on the non-image areas to improve the optical properties of the film To influence the final sheet in the last stage of the procedure. The solvent * superimposed on the image part became however, concentrated as much as necessary to change the optical properties of the final sheet, and sufficiently Amount of doing this. It is noted that the selective absorption of the organic vapor through the coating on the end sheet can be a determining factor, i.e. the coating on the end sheet is an organophilic system that preferentially adsorbs the vapors of the organic solvent.

W _e nngleich the factors which determine the generation of a positive or negative direct-readable image on the end sheet, are not clear and, it appears that the thickness of the film on the copy sheet, its porosity, the thickness of the film on the end sheet and its Porosity, the relative evaporation rate of solvent and water, the pressure and contact times during which the

BATHROOM ΟΡ · ^ --- " ^Λ

009886/0332

Copy sheet lies on top of the print sheet and the print sheet lies on top of the end sheet and the surrounding temperature is everything Are factors that lead to the selective generation of a positive image or a negative image in contribute to the final sheet.

Example 54

A copy sheet from a sheet of glass is prepared according to the procedure set forth in Example 53 ». If this Coating with a 20 percent aqueous solution of dimethyl sulfoxide is moistened, excess liquid is removed and the surface is pressed against a printed book page, a negative image is created on the clay-coated one Surface observed. This was transferred to a film with 4 parts by weight of polyvinyl acetate to form a

is coated / part by weight Gantrez AW 119, / as formed in example 53, a directly readable negative image being depicted in the film of the end sheet. At the time the copy sheet was applied to the printed sheet, the dimethyl sulfoxide was of sufficient concentration to affect the optical properties on the film of the finished sheet.

Example 55

1/2 g of methylene blue and 5 g of gelatin were in 50 ecm Water and 50 ecm denatured alcohol dissolved. This solution

009886/0332 ^r ' ^q - ^! - \ 'al

Flowed over a piece of glass and dried to a deep blue color on a sheet of polypropylene as a base, which was coated with 2 parts by weight of Gantrez AN 119 and 3 parts by weight of ethyl cellulose, was immersed in a 10 percent aqueous solution of sodium dichlorocyanurate for 20 seconds. The excess liquid was dried off and the sheet was brought into contact with a printed surface for 10 seconds and then held in contact with the blue gelatin surface for 10 seconds. A clear negative image developed, colorless on a blue background. Similar negative images were prepared by immersion of the coated polypropylene sheet in 1-owned, aqueous butyllactone or in 5-percent propylene carbonate and 5 fo isopropanol in water, said copy sheets, as described on the printing sheet and the end sheet, have been launched.

Example 56

As an example of the 5 variant, a finished sheet (end sheet) made by mixing polypopylene with a mixture of 0.375 g Carbopol 934, 4 g nitrocellulose, 4 g resinous Plasticizer, SSntolite, MHP from Monsanto, dissolved in 60 ecm methanol, 60 ecm acetone and 90 ecm ethanol coated and dried to a transparent coating.

A copy sheet was made by covering a glass plate with a kaolin film as in Example 53 has been described. The copy sheet was moistened in a mixture of 180 ecm denatured alcohol, 120 ecm

009886/0332 _"BAD o ^ c

Water and 1 ecm ammonia, 28 percent, sensitized. The copy sheet was placed on top of the print sheet for a period of time sufficient to dry out the areas of the film, which lay over the non-image areas of the printing sheet while the image areas remained moist. The copy sheet was then placed on the film of the final sheet until the sensitizing moisture penetrated the film of the End sheet migrated in order to create a white image in the areas in which the moisture infiltration took place.

The procedure was also carried out using water alone to sensitize the film of the copy sheet, and a recognizable image was obtained.

Example 57

An image formation according to the sixth or adhesive variant contains the possibility that an adhesive surface is so sticky that it sticks to the printed book page. To avoid this, it is preferred to form the primary image on a copy sheet cover which, when wet, is mechanical becomes weak but not tacky, and then presses it against the surface of the end sheet, which is at high moisture content becomes sticky. In particular, a copy sheet was formed by attaching a sheet of polypropylene with a 9 percent solution in methanol of approximately equal parts by weight of nitrocellulose and Santolite MHP coated. The final

009886/0332

sheet was formed by coating polypropylene with Carbopol 934 and enough red paint to give a distinct tint. The copy sheet film was moistened with water and pressed against a printed sheet for a period of time sufficient to dry out the areas of the film overlying the non-image portions of the printed sheet while the image portions remained moist. The copy sheet was then pressed against the film of the end sheet. The water in the image portions migrated into the Carbopole film, which became sticky due to the presence of moisture and adhered to the copy sheet. W _e nn the copy sheet is removed, parts remain of this film corresponding to the image parts on the sticky surface of the Endfilmes and thereby yielded a white image on a red background of the copy sheet.

Example 58

As an example of the seventh variant, a glass plate was coated with gelatin. The gelatin was dried and then a solution of an intense dye, e.g. B. 1 g Du Pont Viktoria green in 100 ecm toluene and 100 ecm Flow ethylene glycol monoethyl ether over it. When the solvent is evaporated, a uniform bronze overtone remains over a pale green background. A copy sheet was formed by coating a glass plate with a kaolin film as described in Example 53. The film the glass plate was moistened with water and placed on a

BATH ORIGINAL

009886/0332

The printing plate has been placed in place for a sufficient period of time to cover the parts that are above the non-image parts of the printed image. to dry out and to leave the parts of the picture in a damp state. The copy sheet was then dyed onto the finished sheet placed until the moisture in the image parts of the copy sheet migrated into the end sheet and caused that the film of the end sheet swelled and the dye dispersed in the swollen film, making a directly readable Image was generated.

Claims

009886/0332

Claims (1)

SXOERSTRASSE 2 ΌΧ 22 08 01 ΡΙΟΤΚΟΤΡΑΤΚΗΤ HÜMCHKir 1A-32,469 Claims 1. Method of reproducing images from a "printed Sheet onto a copy sheet, the printed sheet having image areas which have an affinity for Have vapors that are different from the affinity of the non-image parts, characterized by that one creates a high moisture content in one of the sheets and one puts the copy sheet on the printing sheet lays on sufficient time to allow the moisture to move from the wet sheet to the dry one Sheet largely selectively diffused into the non-printed parts. 2. Process for the production of copies from a print image with the image parts, which are in the sorption capacity differentiate for moisture from the Wichtbildteile, characterized in that one on one Surface of an impermeable copy sheet creates a thin film, this film is moistened and the copy sheet brings with the moistened film in contact with the printed film and thereby allows the Moisture is absorbed by the printed sheet in various ways, e.g. between the image parts and the niche image parts of the printed sheet. 009886/0332 3. The method according to claim 2, characterized in that one uses the "printed sheet, which contains cellulose fibers, the image areas of which are printed in such a way that the pressure is a barrier against immigration moisture from the copy sheet. 4. The method according to claim 2, characterized in that a copy sheet is used, whose thin film is opaque and can change its optical properties in the presence of a liquid and the film is moistened with the liquid and further the copy sheet is separated from the printing sheet, whereby a permanently visible image on the copy plate surface due to the change in its optical properties is produced. 5. The method according to claim 4 »characterized in that the liquid used is water. 6. The method according to claim 4 »characterized in that the liquid is a liquid organic compound used. 7. The method according to claim 2, characterized in that the porous film is produced, by exposing the surface of the copy sheet to a reagent capable of forming pores and on it The reagent is removed from the surface to make the pores 009886/0332 r- »r to generate in the surface. ü. Process according to Claim 2, characterized in that the porous film is produced by coating a surface of the copy sheet with a film-forming substance. ^. Process according to Claim 2, characterized in that the copy sheet made of glass, Manufactures polyethylene, cellulose acetate, saran, polystyrene, polypropylene and the like, with the porous / ilm is selected from cellulose acetate, cellulose nitrate, Vinyl chloride, ethylene maleic anhydride copolymer, polyvinyl acetate, cellulose acetate butyrate copolymer, polyvinyl acetate and crotonic acid and other vinyl polymers, polycarboxylates and cellulosic compounds. 10. The method according to claim 2, characterized in that the thickness of the film is in the range from 0.25 to 15 microns. 11. The method according to claim c, characterized in that an i'ilni made of a water-sensitive substance is used and the film is moistened with water. 12. The method according to claim 2, characterized in that the copy sheet against the Holds the print sheet for at least two seconds. 009886/0332 - * BATH ORIGINAL 13. The method according to claim 2, characterized in that the copy sheet film after Separation of the printing sheet is exposed to a developer to combine with the moisture of the surface of the Film to create a visible image in the areas of greater moisture content. H. The method according to claim 2, characterized in that a film is used which contains a developer reactant and wets it with water, the copy sheet after separation von.dem printing sheet is exposed to a developer that works with the development partner in the larger areas Moisture content reacts, producing a visible image. 15. The method according to claim H, characterized in that a vapor is used as a developer Compound is chosen which reacts with the development participant to produce a color change. 16. The method according to claim 2, characterized in that the film is moistened with water and after separation from the printing sheet, the copy sheet is a liquid mixture of an inert carrier and exposing two substances that react with each other only in the presence of water, the two substances the copy sheet penetrate and each other on 009 886/033 2 the surfaces with greater moisture content react. 17. The method according to claim 2, characterized in that the copy sheet against a End sheet (finished sheet) presses the moisture on the end sheet while forming a visible image to be transferred on the final sheet. 18. The method according to claim 17> characterized in that one end sheet with a thin Film is used, the properties of which can change due to a humidifying substance. 19. The method according to claim 17, characterized in that an end sheet is used which contains a layer of dye that is soluble in the humectant and one that is permeable Skin covers the dye, the moisturizing substance touches and dissolves the dye on the end sheet, whereby the dye penetrates and colors the skin to form a directly readable image on the end sheet. 20. The method according to claim 2, characterized in that the film of the copy sheet presses against the end sheet to differently adhere the copy sheet to the end sheet, e.g. between 009 886/0332 bad oresir «. see the relatively humid and the relatively dry Areas of the copy sheet film and then the copy sheet severed from the end sheet to put at least a portion of the film on the end sheet in the adhesive areas of the end sheet transferred to. 21. The method according to claim 20, characterized in that a copy sheet film is used, which contains a dye which is transferred to the end sheet on the adhesive surfaces of the end sheet. 22. The method according to claim 2, characterized in that the copy sheet film against pushes the end sheet, which has a releasable cover which variously adheres the copy sheet to the end sheet, e.g. between relatively moist and relatively dry areas of the copy sheet film, and in that the copy sheet is severed from the end sheet, with at least a portion of the coating of the end sheet on the copy sheet is transferred to the adhesive surfaces of the copy sheet film. 23. The method according to claim 22, characterized in that there is an end sheet coating with dye is used, which is transferred to the copy sheet film in the adhesive surfaces of the copy sheet a. 00988 ^ / 0332 24. Apparatus for generating images, characterized in that it contains a transparent one non-intrusive base sheet with a surface film, that retains moisture from a sensitizing liquid, the film having a thickness in the range from 0.25 to 15 microns, and further contains a sensitizing liquid that forms the film moistened. 25. The device according to claim 24, characterized in that the film is a water-sensitive Compound contains, and that the sensitizing liquid Water is. 26. The device according to claim 24, characterized in that the end sheet has a surface which consists of at least one substance that combines with the sensitizing liquid with the effect that calibrates the optical properties of the Change surface layer. BATH ORIGINAL ₃₁ 009886/0332 Lee rs e ι te