DE1571816C3 - Process for making photographic images - Google Patents

Description

The present invention relates to a method for recording or reproducing information with the help of electromagnetic radiation and a heat-sensitive material that at least contains a thermosensitive substance that absorbs heat when exposed to electromagnetic radiation is produced.

In Belgian patent specification 656 713 a heat-sensitive recording material is described that can be used to record thermal images. The material includes at least a sheet or layer comprising thermoplastic polymeric particles with or without Contains binder, wherein the binder differs from the particles in its permeability and / or fat-friendliness differs. The material provides permeable and impermeable and / or hydrophilic and hydrophobic sites in an image-wise distribution.

For the purpose of image formation, the recording material is made according to the above. Belgian Patent specification exposed to the effect of image-wise distributed thermal radiation. That in the sheet or the layer any thermoplastic polymer present is hydrophobic

ίο and can be in a hydrophilic binder in weight ratio be embedded larger than 1: 1.

The invention is based on the object of a recording method to develop with a differentiated permeability and / or fat-friendliness and / or solubility and / or fusibility of a recording layer by electromagnetic Radiation and is caused primarily by visible light.

The invention relates to a process for producing photographic images by imagewise changing the water permeability or solubility of a heat-sensitive layer of a recording material, the heat-sensitive layer of which contains hydrophobic polymer particles dispersed in a hydrophilic binder, the polymer particles being in thermally conductive connection with one or more substances, which are able to absorb the light used for the imagewise exposure of the recording material and convert it into heat, and during the exposure an original with image parts which can be heated by this light is kept with these image parts in thermally conductive contact with the heat-sensitive layer, and where the water permeability and - solubility of the recording layer is lowered so far that the parts of the heat-sensitive recording layer corresponding to the image parts of the original can be selectively washed out characterized in that electromagnetic radiation from the visible and the near ultraviolet range is used for the exposure and is exposed for a ^{maximum of 10 -1 seconds.}

The short-term and intensive exposure of the heat-sensitive material to light from the visible and the near ultraviolet range according to the invention surprisingly ensures that those areas of the heat-sensitive layer experience a change in their physical properties which correspond to the non-image areas of the original. Although the original is in thermally conductive contact with the heat-sensitive recording layer during exposure, there is still no heat build-up in the image areas of the original and no heat transfer from these image areas to the corresponding areas of the heat-sensitive layer, but rather the heating and thus the change in the recording layer occurs in the non-image areas.
Electromagnetic radiation is used for exposure, the main part of which (at least 70% of the radiation energy) is in the wavelength range below 700 nm. The exposure is preferably carried out with visible light.

The exposure time should be 10 ^"1 lake not exceed. It is intended for one and the same area of the recording material is less than 10 ² lake, and preferably 10 ^-2 to 10" be ⁴ lake.

The inventive method is based on one

3 4

selective or different heating of the drawing material, whereby its properties, with one or more substances, the visible its meltability ^ its water-permeable light or part of the visible wave-permeability, its solubility in water or organic absorbent length range and convert it into heat by solvents and / or its hydrophilic character 5,
to be changed.

The material caused by the action of heat on the electromagnetic 2. Imagewise flash exposure of the recording table radiation absorbing substances, pictorial differentiation of the properties can be achieved their essential portion of visible light, if the thermoplastic io consists, so that the recording material by polymer particles within the exposure of the recording layer is a selective or differential in a thermally conductive contact with each other, decrease in its permeability and / or fat than even when it experiences meltability brought about by close contact between two friendliness and / or solubility and / or different carrier materials,
will. , 15

The inventive method does not require that

the heat-sensitive layer contains a binder. The imagewise exposure can be both progressive However, there is the use of a hydrophilic (e.g. exposure of a tape-shaped recording binder in a weight ratio of less than 1: 1, materials) or done simultaneously. In the second case based on the thermoplastic particles, preferably 20, for example by reflex exposure or through-die best results are achieved with a light on an original such as a print template obtained from one or more or a silver halide transparency. Here can hydrophobic thermoplastic polymers that reverse and reverse the image in a weight ratio of 3: 2 in a hydrophilic on exposed and as a positive or as a negative binder are dispersed. 25 wraps.

According to the method according to the invention, with regard to the change in the physical

the most varied types of printing forms. With properties it is not necessary that the record

For example, for screen printing, flat printing, the processing material is undergoing an extreme change, for example

Letterpress printing, etching printing, magnetic printing and those in such a way that individual parts of the material are completely

Hectography. 30 casual and / or completely fat-friendly and / or completely

In addition, the material is suitable according to being soluble and / or completely meltable,
of the invention for the production of legible copies of the degree or the nature of these differentiations of an original, which can be transparent or opaque reflective rather depends on the intended animal. intended use of the recording material, with

The principle of the recording method according to other words of how the record is read

The invention can be briefly represented as follows: or is to be developed. From the further

The recording layer consists of a fine writing that shows that the distributed, hydrophobic thermoplastic polymeric process of the invention is applicable to the majority of recording and material. It is made from an aqueous dispersion, copying techniques in the photographic and / or mechanical field, which, if necessary, a hydrophilic binder can be used,
contains, so that the interstices of the thermoplastic particles are water-permeable. If the layer method for producing prints now contains light-absorbing substances, reflex copy or the usual fluoroscopic method, which enables heat exchange with the polymeric particle method, for example by contact or direct, and if this system is exposed for a short time. When using the reflex method, the exposure intensity and the heat sensitivity are exposed moderately with an intense electromagnetic beam, then the temperature in the speed of the recording material rises suddenly and changes the areas that are advantageously so exposed that the physical properties are selected directly from the light source the shift. the photosensitive material directed rays

This change in physical properties 50 physical properties of the thermosensitive

can practically not or only little changed in various ways for the production of material.

Use pictures. The possible methods for this The image-wise reflected light then calls into the

are described in the following: Material the practically usable picture differences

. The recording method according to the invention lies between those struck by the reflected light and

In its preferred embodiment it protrudes from 55 the areas not hit by this light,

the following steps: For reflex exposure, the coating of the

Recording material be sufficiently transparent.

1. Provision of a recording material which For the fluoroscopic method it is favorable

with at least one essentially drying if the recording material, in particular a

and a water-permeable layer, 60 multi-coated material, is opaque.

which contains particles, which in total or to the The term "transparent" is related

The main thing is to understand from a hydrophobic thermoplastic with the light source used. In the event of

See polymers that are made by weight- using a gas discharge for exposure

Ratio greater than 1: 1 in a hydrophilic, the emitted waves are in the range between

Binder is dispersed. The softening point 65 is 0.3 and 1 μ. When using a light source,

of the particles is preferably 10 to 200 ^° C. above which the visible light supplies are larger or smaller

Room temperature and their size between 0.01 μ proportions of infrared and ultraviolet radiation in

and 50 μ. To consider.

S 6

In order to have a warming effect on a substance with visible light, the electromagnetic radiation can be absorbed into the light-sensitive material and converted into heat, finely divided black or dark colored pigment Another possibility illustrates this or a corresponding dye can be incorporated. 5. Inside is (9) a top layer that covers the beaches. These additives can also contain absorbent particles in another 5 lung, and (1) the Sheet or another layer may be included, the heat-sensitive layer on the base (2). the recording material is applied, so that a heat- In F i g. 6 is a heat sensitive layer (1), transition between the additives mentioned and a layer support (2), an intermediate layer (8) and thermoplastic polymeric particles ensure a top layer (9) shown. Here contain the is. ίο the two last-mentioned layers, the radiation-absorbing

Without particles (4) which are to be restricted to the subject matter of the invention. It is easy to see that ken, is intended to the mechanism of the recording process in materials such as those shown in FIGS. 4 to 6 shown It can also be said that the finely divided are hydro- and in which the radiation-absorbing subphobes thermoplastic polymeric particles that punch (whether in the form of particles or otherwise) into a enveloped by a moisture film or a wetting agent 15 other than the recording layer is brought into a hydrophilic binder dispersed, the radiation-absorbing substance are to be less thermally conductive due to the local layer containing very intense heating come into contact with each other while doing an im need to prevent the from being absorbed by the absorbers impermeable polymeric network be the heat given off by the substances form, in which the hydrophobic particles are distributed to one another 20 entire layer. On the other hand needs glue. the heat conduction from the substances to the po-

Not to be hindered following the general description of the polymer particles. This fac-

Invention, the system and structure should now be lost, and the layer thickness must be taken into account when choosing

different heat-sensitive materials as well as suitable layers for radiation-absorbing sub-

the type of light source used and the punching used must be taken into account,

the development techniques are described. In the following the term heat-sensitive

The F i g. 1 to 8 show enlarged sections of the recording layer, also for layer assemblies

7 types of heat-sensitive materials used in accordance with FIG. 4 to 6 represent and at

present invention. which are the thermoplastic polymer particles and

. F i g. 9 is a graphic representation of the flash 30 absorbing light and converting it to heat -

exposure method according to the reflex method. the particles in adjacent layers

F i g. 10 is the schematic representation of an applied.

drawing material in connection with a loading F i g. 7 shows a heat-sensitive layer (1)

clearing device. on a pad (2). Layer (1) contains in one

F i g. 11 shows the graphic representation of a thermoplastic which is hydrophobic for 35 hydrophilic binders (S)

the transfer method described below see polymer particles (3) and particles (4) one

suitable device. radiation absorbing substance.

In Fig. 1, a thermosensitive material is also used as the thermosensitive material that of a thermosensitive coating composition in the layer (1), which is attached to the base (2) 4 ° impregnated carrier material suitable, for example a and the dispersed particles of a hydrophobic Japanese thermoplastic commonly used in the manufacture of stencils Polymers (3) and particles (4) paper.

Contains one or more substances that have been described as electro- although so far only absorb magnetic radiation in detail and substances which absorb heat in finely divided form (which can be converted into a hydrophilic binder-dispersed state) (5). ¹ Fig. 2 shows a recording material can be put into shape, for example as a solution or as a unit of a self-supporting sheet (6), consisting of a borne phase or layer.

Dispersion of electromagnetic radiation absor- As already mentioned, can be heat-sensitive

bating particles (4) and of thermoplastic 50 layers or self-supporting films according to the invention

polymer particles (3) in a hydrophilic binding find a certain amount of hydrophilic binding agent

medium (5). contain. Hydro-

As in Fig. 3 shown, can be a heat-sensitive, natural colloid, modified hydrophilic Liches material also a heat-sensitive, naturally colloid or synthetic hydrophilic essentially dry and porous layer (7) contains 55 polymers. More specifically, the binders will be that is attached to the base (2). Those selected from the group of the water-soluble Na-layer (7) consists primarily of hydrophobic, natural or modified, natural hydrophilic thermoplastic polymer particles (3) and partial colloids, such as gelatin, glue, casein, chen (4) that absorb electromagnetic radiation zein, hydroxyethyl cellulose, carboxymethyl cellulose, and can transform it into warmth. Layer (7) 60 methyl cellulose, carboxymethyl hydroxyethyl cellulose, Hydroxyethyl starch, gum arabic, sucrose are preferably produced from an aqueous latex system, in which the polymeric particles with an octaacetate, ammonium alginate, sodium alginate and Moisture film can be enveloped by them on the hydrophilic derivatives of such colloids. Further suitable Prevents sticking together, which however also destroys synthetic, hydrophilic polymers, such as erosion, through heat can be. The heat-sensitive material, for example, polyvinyl alcohol, polyvinylpyrrolidone, potential can also, like F i g; 4 shows a thermally lyvinylamine, polyethylene oxide, polystyrene sulfonic acid sensitive layer (1), a support (2) and polyacrylic acid and hydrophilic copolymers and derivatives Intermediate layer (8) contained in the particles (4) vate such polymers.

7 8

Some of these polymers as well as their derivatives are dependent on what is necessary for the copolymerization or copolycondensation is used in weakly acidic or weakly alkaline range. The Molein Water soluble. kular weight for the method according to the invention

The polymer suitable for producing the material according to the invention can be used within wide limits The hydrophilic binders used should vary in reverse. Polymers with a molecular weight im Looking for a higher mechanical strength hardenable range of 5000 to 1 mill, are preferred. Being. A gelatin type film-forming material particularly suitable is single-molecule polyethylene for example, by reaction with an aldehyde weight of 15,000 to 50,000. However, there is like formaldehyde or glyoxal. a certain connection between the enamel-like Suitable for this are alum and other hardening points or the softening temperature and the tending agents which, together with the colloid, increase the sensitivity (imaging temperature) of the recording layer can be processed or with their voltage layer. In addition, there seem to be other fak solutions the finished recording material behaves to play a role. So it was observed that is delt. both with polyethylene and with polyvinylidene

The use of hardening agents in recording layers with 15 chloride recording layers with the same warming materials that contain hydrophilic binders is obtained,
th, generally depends on the desired mechanical strength for the production of the mechanical strength according to the invention. The amount of hydrophobic thermosetting agent suitable for drawing material used can be between 0.5 and 5 percent by weight of plastic homopolymers and copolymers. The treatment of the recording aqueous dispersion containing a hydrophilic binder layer or the self-supporting film can be used with one. The aqueous dispersion solution can be carried out, the concentration of which in the homo- or copolymer is preferably between 2 and 25 percent by weight of free-radical chain polymerization in emulsion of a curing agent. or more polymerizable monomers

Manufactured for wet or dry transfer by 25 known methods. These procedures are

Parts of the recording layer which are not imagewise, for example in the work of W. Sörenson

have been exposed on a receiver and T.W. Campbell, Preparative Methods of

the hydrophilic binder preferably contains a Polymer Chemistry, Interscience Publishers, New York

Plasticizers. Suitable plasticizers for gelatin (1961), described. Here, from dispersion

are urea and potassium thiocyanate. Made use of other aids such as those provided by K. L a u χ

suitable plasticizers for gelatin are given in J. Phys. in "The Surface-Active Substances" in Winnacker-

Chem. 60: 1299-1306 (1956). In the case of Küchle rs "Chemical Technology", Carl Hanser

of the wet transfer, the plasticizer is said to be described in the Be Verlag, Munich (1960), pp. 155 to 242,

Moisturizing liquid must be present in order to carry over. In addition, aqueous dispersions of

of the unexposed areas of the recording layer 35 polymers must be taken into account, which by dispersing

to ferment a solution of a water-insoluble polymer by pressing it against a receiving material

improve. in a water-immiscible solvent

The hydrophobic, thermoplastic polymer, which is manufactured in the aqueous solution of a hydrophilic binder according to the invention, the most important heat-sensitive. Examples of solvents that may be used in the recording material include 40 chlorinated hydrocarbons, such as methylene should be mentioned after pouring from an aqueous disperchloride and trichlorethylene,
sion at a temperature which does not exceed room temperature. In another process, aqueous solutions are not significantly exceeded and, after drying, a dispersion of polymers is formed by dispersing them into a porous or water-permeable layer. The melted thermoplastic polymers in water polymeric particles preferably soften between 45% obtained in the presence of wetting agents. For ver-10 and 200 ⁰ C above room temperature. As examples of the dispersion characteristics improvement can there may be mentioned, polymers, a certain number of hydrophilic groups include a melting point or a Erweichungstempe-, as in the case of suitable polymers of partially temperature oxidized between 10 and 200 ⁰ C above room temperature polyethylene.

to have. Particularly suitable are, for example, poly 50 Suitable dispersions of polymers can be

Ethylene and polyvinylidene chloride with a melt also mechanically finely divided by dispersing

point of 110 or 190 ° C and the following polymer particles in water. For this purpose

meren with the softening temperatures: Polystyrene is preferably used as surface-active substances

(100 ⁰ C), polymethyl methacrylate (70 to 105 ⁰ C), poly and / or hydrophilic protective colloids, such as poly

ethyl methacrylate (50 ⁰ C), polyvinyl chloride (about 70 ° C), 55 vinyl alcohol or gelatin. Through polymerization

Polyacrylonitrile (about 100 ⁰ C), poly-N-vinylcarbazole emulsion produced dispersions are, however,

(200 ⁰ C). preferred. After this polymerization process

As is known, the softening temperature of the monomer can be lowered in the form of fine droplets in water by adding so-called plasticizers. dispersed, the emulsifying agent (soaps, ammonium details about suitable plasticizers and the 60 oleate, sulfonated fatty alcohols, etc.), protective colloids, softening temperature of homo- and copolymers (carboxymethyl cellulose, polyvinyl alcohol, etc.), a are in the work Chimie Macromoleculare - buffer system , surface-active substances and wasneralites, by Georges Champetier, Librairie, to find soluble catalysts, for example hydrogen peroxide Armand Colin - Paris Vem, pp. 194 to 198. or a persulfate. In this way, a stable structure is obtained.
or copolycondensation a range of softening The polymeric particles in the dispersion should be able to reach temperatures from the amount of 0.01 to 50 μ. The larger the particles, the higher the ratio of the monomer or condensation reagent.

9 10

tion. Dispersions with other useful radiation-absorbing pigments give very good results

a particle size around 0.05 to 2 μ. Dispersions, elements and information about radiation-absorbing elements

whose particle size is between 1 and 1 ΐημ, substances are in the Belgian patent

are called colloidal systems. A colloi- 657 502 included.

dales system, the carrier phase of which consists of water 5 In a special embodiment of the

(Dispersion medium) and its dispersed phase drawing material can reduce the hydrophobic thermo-

from particles of particle size 1 to 0.001 μ formed plastic polymeric particles themselves the substances

is called hydrosol. Good results contain which absorb visible light and get

one with such hydrosols, whose polymeric particles convert into heat. Such polymeric particles

are not greater than 0.1 μ. Equally good results can be produced, for example, by

provide recording layers which contain 0.5 to 10 g of the emulsion polymerization in the presence of the im

thermoplastic polymer particles per square reaction medium dispersed absorbent sub-

meter included. The thickness that is punched according to the invention.

applied recording layers varies preferred As an example of an intimate mixture of dispersed between 0.5 and 10 μ. As already mentioned, it is not necessary to describe the production of a dispersion of heat-sensitive layers according to the invention of ethylene and carbon black for the production of the invention.
Use binders. You can choose the layer 40 g of a partially oxidized polyethylene, hergeträger and / or the drying process for the layer according to British patent specification 997 135 so that between the binder-free oxidation of polyethylene with an average layer and the base natural adhesive forces on-borrowed molecular weight of 7,000, a melt-treading. A slight sticking (e.g. by heating) point of 130 ° C and an acid number of 26 to 30, the polymeric particles to each other and to the Un- are melted between 130 and 150 ° C. The mechanical strength increases the mechanical strength of the layer, without affecting the porosity of the layer of molten polyethylene. Since a binder is not absolutely necessary oxy-decaoxyethylene and is stirred in portions, the amount of hydrophilic binder in the 20 g of carbon black with a particle size of about 0.04μ can be reduced to between 0% and one recording material. A viscous black paste is obtained in this way; the percentage varies relatively high. which is allowed to cool to room temperature. That

The amount of hydrophilic binder is then finely ground in black polymer

The main thing is through the required hydrophilic and through a 60-mesh sieve (mesh size 0.25

Determines the hydrophobic difference given by the mm).

image-wise heating of the heat-sensitive 60 g of the ground material in 300 ecm of softened water

Layer receives. In general, a weight loss is now placed in a SOO ccm autoclave,

ratio of 1: 1 of the hydrophilic binder and 35 of the thermometer, manometer and stirrer

the hydrophobic thermoplastic particles is to be prepared. The dispersion is now stirring

high. On the other hand, one gets heated at a ratio of 90 ° C and then the autoclave is

of 3 parts by weight of hydrophobic thermoplastic closed. While the temperature rises to 150 ° C

Particles to 2 parts by weight of the hydrophilic binder increases, if the stirrer is accelerated to 2000 rpm

by means of a very clear image-wise change of 40 rotations per minute. After 30 minutes one leaves

hydrophilic to hydrophobic and from permeable to un- cool the autoclave to room temperature. Man

permeable, which receives a black dispersion with both for the production of this way

Copies as well as for reproduction purposes usable at a pH of 8.3.

is. . According to a different procedure, a

The temperature at which the heat-sensitive 45 certain proportion or all of the hydrophobic thermo-

Material a substantial loss of its through-plastic polymeric particles dissolved a substance

Experiences permeability is, preferably in the range between contain, the electromagnetic radiation in heat

see 40 and 200 ⁰ C. transformed so that the transparency and the warmth

The heat-sensitive material can be self-sensitive of the recording material by the

can always be influenced before or during the formation of the image-polymeric particles themselves,

moderate differentiation in its entirety to the heat-sensitive layer should be 0.01 to 1 and

a certain temperature are heated below, preferably 0.1 to 0.5 percent by weight pigment,

the temperature necessary for image formation. based on the total weight of the layer,

Such measures will keep the amount of heat. When no colors are reproduced

through which the thermoplastic particles are supposed to become black or deep black in color

th places of the layer by thermal conduction or pigments are preferred. In the case of reflex copy

Heat exchange with the light-absorbing sub- is said to be the optical density of the light-absorbing

punch should be increased, reduced accordingly. Layer (gray layer) preferably between 0.25

Suitable for the method according to the invention and 0.78.

Pigments that convert visible light into heat, 60 'For the reproduction of colored originals, the

are for example the following: colored substances and their mixtures

Soot, graphite, heavy metal oxides or sulfides, substances that only light part of the visible

absorb especially heavy metals with an atomic spectrum and convert them to heat

weight between 45 and 210, such as manganese conversion, preferably light of one of the primary colors

or lead sulfide or heavy metals themselves in finely 65 (red, green, blue) or subtractive colors (blue

divided form, such as silver, bismuth, lead, iron, green, purple, yellow).

Cobalt or nickel. As a light-absorbing material, substances that absorb part of the visible light

carbon black is preferred for the present invention. absorb the visible spectrum and absorb the

11 12

Converting light energy into heat is a way of playing with other image-generating materials in the groups of the azo and triarylia. Furthermore, hardeners for methane, the xanthene, acridine, methine. Azine, the hydrophilic binder and optionally Phthalocyanine, anthraquinone and similar dyestuffs, drier substances, which make the hydrophobic to find fabrics. 5 thermoplastic polymers at elevated temperature

These substances can be dispersed and / or hardened.

dissolved state can be used. For the disper- For the case of the application of a reflex exposure

If the grain size is smaller than 0.1 μ, the concentration of these additives should not be so high

preferred. that the heat-sensitive layer becomes too opaque.

The amount of substances in a heat-sensitive io which may release a hydrophilic binder Recording material depends on the holding heat-sensitive layer can also be on desired heat sensitivity of this material, a hydrophobic layer should be attached to it the available radiation intensity and can serve as a base. Under hydrophobic The expected effect of the available heat on the layer is understood to mean a layer that is not the substances. 15 or only slightly wetted by water.

If the colored substances are exposed to heat, such layers or bases are for example

sensitive material are incorporated, if they are wisely made from cellulose ester derivatives, poly-

preferably in an amount that is an optical ester, polystyrene, glass, etc.

Density between 0.3 and 5 causes. In a layer or film that coincides with the

The preparation of the heat-sensitive layers 20 heat-sensitive material is in contact or

can with conventional means such as rollers, in a water-permeable relationship, can add additives

Brushes, sprayers, squeegees, and air-conditioning may be included for making it more visible

brushes are carried out, making a control of the images in accordance with the recorded

The thickness and distribution of the coating composition are of practical interest, e.g.

possible. 25 pigments, dyes, reaction components for the

In a recording material loading components of a dye formation, developing agents, reaction heat sensitive layer on a support or dyes, which preferably is located, this base can distill the purpose below 8O ⁰ C or can sublimate, material to be correspondingly rigid or flexible. Development nuclei for the silver salt diffusion agent can also be permeable or impermeable, 3 ° drive, catalysts for color reactions, conductive, for example water-permeable such as a trans particle and light-sensitive substances,
parent tissue. If flexibility is not important, the effectiveness of the electromagnetic radiation plates made of metal, glass or plastic, which is to be converted into heat, fibreboard, cardboard and the like used depends essentially on their intensity. So can be. 35 z. B. a recording material that upon exposure

Depending on the intended use, the energy of the invention, which is determined by a light source, can

Corresponding material in various ways built up kaiischen properties in inadequate ways

will. So you can, for example, change the heat, deliver completely satisfactory results,

sensitive layer (with or without a hydrophilic binding - if the radiation energy is increased accordingly,

medium) on a hydrophilic layer that 40 As the radiation energy increases, the

in turn serves as a carrier. Under the hydrophilic layer, distance between the light source and the recording

This is understood to mean a layer that is made larger by the material. The ones from the image areas of a

Water or aqueous solutions is wettable. These originals absorbed and converted into heat

Layer can be porous or water-permeable. The radiant energy is all the more rapidly dispersed and

can, for example, mainly consist of natural 45, the adjacent imaging element can be so

or synthetic hydrophilic colloids. the shorter the irradiation and less affect

Examples of such layers are a gelatine - the more intense it is. Lamp systems that do this high

layer, a photosensitive silver halide layer, providing intensities are generally available

a water-permeable germ-containing colloid layer and do not form part of the present invention,

for the silver salt diffusion process, a colloid lamp with high radiation intensity and relative

layer, the pigments or dissolved dyes or short exposure times are so-called flash lamps,

a reaction component suitable for a color reaction - more precisely gas discharge flash lamps,

Component contains a hydrophilic colloid layer, which in connection with the present invention

Developing substances for silver halides or grains will give good results with a xenon gas discharge

contains plex silver salts or a hydrophilic colloid lamp containing energies from 300 to

layer with finely divided metals, such as 1000 watt · second in time spans from 10 ~ * to

Silver that can be etched away. Delivers 10 ~ ⁸ seconds.

In addition to a hydrophilic binder, according to a preferred embodiment of this, the heat-sensitive layer can all kinds of additions, this gas discharge lamp has the form, such as electrically conductive particles, e.g. B. soot, 60 of a thin tube contained in a hollow glass, further dyes that bleach, cylinder is arranged (Fig. 9), so that a unitary distillation or sublimation, reaction component exposure of the recording material, the components for dye formation, there is catalysts for the outer wall of the cylinder. Color reactions, development nuclei, photosensitive details about gas discharge lamps, which are substances, developer substances for silver halides or complex silver salts, finally finely divided ones, can be found in Belgian patent specification 664 868 Metals that can be etched out, reaction compounds,
components, which preferably below 8O ⁰ C distilled Also gas discharge lamps with lower energy

13 14

A second possibility is to focus the energy on a relatively small thermosensitive drawing material in a bleachable colored sub-area. For example, punch is suitable to incorporate, which is decolorized by a bleaching agent, a gas discharge lamp with a power of which in the areas of 40 watts that have remained permeable for copying 6 6 cm 5 recording material, and 6 9 cm in size On the other hand, an etchable metal, such as a sensitive material according to the present invention, can also be used for originals on a heat-sensitive material. colloidal silver, in the recording material dis- For recording materials whose optical density is pergated and thereby image-wise etched out, is at least 1, a power of 0.3 watts-se- that you put the etching liquid in the permeable stamps per cm ² by the The required image sub-areas of the recording material can diffuse in to obtain different. It goes without saying that the heat-sensitive layer can moreover result in the exposure being progressively or intermittently replaced by an etchable material, for example a zinc. In other words, the thermosensitive or copper plate will be attached. On this borrowed material, either with a modulated manner, it is possible to produce a letterpress or intaglio form of high intensity light point scanned image-wise 15.

be, for example with a laser beam, or Another application of the diffusion process

It can be progressively exposed through a slit which consists of the imaging substance in it

be, through the z. B. to incorporate the copy light of a con-recording material and through it

continuously radiating tube lamp is focused. Diffusion from the districts that remained permeable

A great advantage of the thermal copying process 20 is to transport to an image receiving material,

according to the present invention is in comparison to So it is, for example, possible to use the recording

the classic thermographic copying process, material or one of these associated liquid-

a soluble dye in the high sensitivity, image sharpness and permeable layer

the ability to use visible light. To be retained, who is capable of being in a receiving

it makes it possible to reproduce originals, the material diffuse if the heat-sensitive

Contain image markings, which neither infrared-borrowed material is moistened,

are absorbent and thermally conductive. According to an interesting process, the

When the radiation hits the substrate of the heat-sensitive layer or a layer assigned to it

Drawing material is directed, the layer must be liquid or solid substances, for example encapsulated

be sufficiently transparent. 30 lated dyes. After the pictorial impenetrable

The semitransparency of the heat-sensitive layer is created during reflex exposure Parent recording material between radiation is, one is placed on the surface of the recording source and original. The original (negative material made a print. Under the effect of this or positive) contains areas that burst the copying pressure, the capsules and color the heat light reflect, or it is a transparency, 35 sensitive layer in the places through the have remained casually in contact with or near their back.

with an element that reflects the radiation. Through these points, the contents of the capsules can

see is. Before the examples for the execution of, for example, transferred to a receiving material

Reproduction method according to the present Er- (recording method without processing

a brief overview of the various types of liquid or bath). Making more suitable

systems which, starting from capsules, are used, among others, in the Belgian Pa-

the heat-sensitive material documents 628 650, 634 666, 634 667 and 634 668 described here

lien, for the production of copies and pre- described,

locations are suitable. Instead of the dye, the recording

According to a first system, the 45 material also becomes a colorless reaction component

Exposure caused imagewise differences or a catalyst encapsulated if necessary

in the permeability and hydrophilicity to be built in form, which leads to a color

uses an imagewise diffusion of imaging sub-reaction with a reaction component in the

punch in the recording material run is capable of receiving material.

leave, for example by treatment with liquids 50. It is also possible to incorporate the recording material into a receiving material in the recording material or the transfer of such substances from the inter alia silver salts. The plexes form and which in their soluble form in an imagewise diffusion is able to diffuse in through the receiving material mentioned, which contains redifferentiation of the physical properties production or development nuclei, in which case it is possible. For this purpose, the recording material provided with an image 55 correspondence with the locations of the recording can be immersed in an aqueous material which has remained permeable, an image dye solution, the dye forming a moderate silver precipitate,
can diffuse only at the points of the recording material (layer in this diffusion process need the image or film) that are permeable and imparting substances, such as dyes, or that have remained sufficiently hydrophilic. 60 bare metals, or reaction components not in

Instead of a dye solution, it can of course also be contained in the recording material itself. You can use the solution of a catalyst, which can just as well be accommodated in a layer or a carrier, a color reaction between the components and material which initiates the recording material with the recording material or which is connected to the recording material.
Solution of a colorless reaction component that is capable of a color reaction with a colorless or self-supporting film, on the other hand, after the weakly colored reaction component in the exposure, an image-wise water-permeable membrane drawing material can be used. represent, through which an aqueous dye solution

able to diffuse through. One receives on this Way a master copy with the help of which several copies of an original are placed on a transfer material can be produced.

The membrane can also be used to produce electrolytic prints, since the membrane in contact with a receiving material acting as an electrode, the electrolyte only passes through the permeable ones Places through, with the result that on the electrode material an imagewise electrolytic Deposition of the imaging substances takes place.

According to another system, the permeable and soluble areas of the heat-sensitive area become Material, for example by washing out or by degradation of the hydrophilic binder, removed. In this case, the recording material can contain a dye, for example a (colored) Pigment or a dissolved dye, so that in the treatment of the image areas with a liquid creates a reproduction of the original.

Using this system, you get to a gravure stencil if the heat sensitive Recording layer is applied to an etchable metal base. After removing the permeable and hydrophilic parts of the recording material, for example by washing out, can be etch the uncovered metal surface in an imagewise fashion. According to this method, for example printed circuits are manufactured. After you have removed the remaining parts of the recording layer, for example with the help of an organic solvent, the etched metal plate is for ready for use as a gravure matrix.

After this procedure, you can simply wash off the permeable and hydrophilic parts letterpress forms can also be made of the heat-sensitive recording layer. The washing process In this case, the remaining parts of the recording material can be hardened, if necessary. This way you get a Relief image.

If the recording layer is placed on an electrically conductive base, such as aluminum, is attached, an electrostatic printing plate can be made therefrom. By washing out of the permeable areas of the recording layer, the electrically conductive substrate becomes the exposed Image exposed accordingly. The remaining parts of the recording layer have then a significantly higher electrical resistance than the conductive base. As a consequence of this When the recording material is electrostatically charged, a charge image is created. This charge image can either be developed by known methods, for example with the aid of a powder or for the electrostatic transfer printing on an insulating transfer material.

In addition, the recording material treated in this way can also be used to produce conductivity images to be used. Such materials and their application are described in the Belgian patents 589 996 and 599 628.

Another possible application of the system described is the production of stencils or screen printing stencils. For this technique, one or both sides of the permeable substrate are covered with a recording layer. Suitable supports are Japanese paper (Yoshino paper), nylon fabric with a mesh size of 0.2 to 0.08 mm or bronze fabric (cf. Example 5).
In screen printing technology, as is well known, the printing ink can only reach the print substrate at the open (permeable) areas of the fabric. These vacancies are obtained in the process of the present invention by washing out or

ίο etching away the recording layer at the points which have remained permeable or hydrophilic.

According to a third system, the permeable and hydrophilic areas are moist and / or heated State transferred to an image receiving material by pressing on and tearing off.

This transfer process is possible when the cohesion of the receiving material is greater than that of the permeable bodies de? Recording layer is and when the adhesion between the permeable Places and the receiving material stronger than the cohesion of the permeable areas of the recording material is.

After pressing together a moistened and imagewise exposed recording material with a receiving material, which preferably has a hydrophilic and / or porous surface, and then Separation of the two materials gives a satisfactory transfer print. In this case contains the recording material preferably has either a recording layer which is a hydrophilic Contains binder in which the hydrophobic thermoplastic polymeric particles are dispersed, or a recording layer composed of a porous layer of said polymeric particles is on a hydrophilic, preferably a colloid, layer with considerable swelling capacity.

The opposite method to the transfer method is possible if the adhesion of the substance in the contact material - referred to here as transfer material - is _: smaller than that of the substance in the permeable areas of the recording layer and if the adhesion "between these permeable areas and the transfer material is stronger than that of the Then, for example, a carbon paper with a less hydrophobic surface, such as is used for the process described in Belgian patent specification 600: 508, can be pressed against the moistened image-wise exposed recording layer The parts of the color layer corresponding to the permeable and hydrophilic areas are returned to the recording material. The hydrophilic binder of the recording material can "vor; the community

presses are swollen ',' so ^; that a relief image is created that allows closer contact with the paint layer. / ^ Y

According to this third system, hectographic Transfer originals are made when the torn material, a hectographic Contains dye that is soluble in alcohol, or a reaction component that reacts with a second component, z. B. in a liquid or a transfer material, can form a dye.

By modifying the third system, one can achieve that the unexposed areas of the heat-sensitive material together with a layer of softened polymer on a receiving

17 18

material are transferred. For this purpose, the layer for the production of the multicolor prints are used of a polymer which, at low temperature, deviates from the matrices obtained in this way in a fit one above the other, z. B. below the temperature at which the drawn.

heat-sensitive recording material his For this printing system can be both aqueous

Loss of permeability, 5 printing inks on the recording layer (see e.g. Belgian patent specification 676 898)

placed. as well as bold offset printing inks in the

Colors required by compressing the exposed recordable process (blue-green,

voltage layer with a receiving material, ζ. B. purple, yellow) or in those for the additive process

Paper, with simultaneous heating, used for example with the help of necessary colors (red, green, blue)

by two heated rollers, and then io.

Separation of the two materials is finally achieved for a reproduction of originals that

the effect mentioned at the beginning (record-separated representations in the pure primary colors

driving without processing liquid). Wear blue, green and red (e.g. a letterhead in

A suitable for the method described here (the colors blue, green and red), three separate recording material is shown in FIG. 8 shown. The 15th thermosensitive materials used, which are sensitized for material consists of a thermosensitive yellow, purple and cyan, respectively, layer 1 on a polymeric layer 10 with a a blue, green and red dye in the softening point, which is below the temperature thermosensitive layer ,
where the heat-sensitive layer is opaque. -I ₁
becomes casual. The polymeric layer adheres to the 20 Example 1
Base 2. The heat-sensitive layer contains a cellulose-dispersed particle of a hydrophobic thermosensitive triacetate base provided with a gelatin adhesive layer and coated with the following plastic polymer 3 and particles 4 of a solution (12.5 m ² with 1 kg):
several substances that absorb visible light " _Λ,. .... ...., - ,,., ..

and convert it into heat in a hydro- 25 ™ * «ner 6% aqueous gelatin solution,

philic binder 5. 100 ml of a 105% aqueous pyrogallol

According to another system, it is possible for “,. ^sung "" ^. .. ". _o ....

Use of a low-melting substance (e.g. ^{20 ml emer n} % '8 ^en aqueous saponin solution

of a dye) in the recording layer itself, ^au .

this dye is filled up with water by melting the recording 30 ^{1000 ml,}

After drying it becomes a heat-sensitive layer, which is in contact with the transfer material

there is a time to transmit. Layer applied. The casting solution for this layer

According to a 5th system, the exposed record has the following composition (application 10 m ²

tion material used for planographic printing. The per kg casting solution):

happens either in conjunction with a bold 35 _ίΛη,. .... .. ". ",. ...

Printing ink (in this case using a? 00 m emer 3% aqueous gelatin solution,

Dampening system) or with a printing ink that consists of ^{160 ml} « ⁿ for ^r . ffö ™ ^ ^aßr ! f ⁿ , emulsion of

the mixture of a colored aqueous phase with χ ^ Γ ^ Γ ^(Kon l ^g / l ^e u- ^Iei ^^ ' ^μί

a colorless or almost colorless oleophilic _{1 / in} , molecular weight about 15,000 to 30,000),

Phase exists. In this context, on ₄ ° 140 ml of a 3% aqueous solution of a

the Belgian patent 676 898 is referenced. Condensation product of oleic acid and

Multi-color images can be created using a heat, Metnyttaurra ^and "". '"..
Sensitive material can be obtained, which consists of ^{1 ml of a 5} % ^ n aqueous carbon black dispersion, more than one heat-sensitive element. The above copy material has after the Trock-So it is z. B. possible, at least two colors of a 45 NEN a density of 0.27.
to reproduce subtractive mixing. Man use.
For this purpose, a recording material from the above processing is required:
written type, consisting of a transparent As in F i g. 9 schematically indicated, the substrate, one side of which is covered with a heat-sensitive copying material (19) with the heat-sensitive layer, which for example contains 50 borrowed layer (20), is brought into contact with the red dye, and the other side A duplicating original (21) bearing a light-absorbent, heat-sensitive layer with a green colored image portion (22) and a reflective backing or blue dye. reason (23) owns.

Multi-color prints can also be made. It is exposed in the reflex, whereby the base for this purpose are advantageously used three of the above-described copying material against a sensitive material. They contain glass cylinder (24) is placed, which has a diameter substances that absorb light from the red, green and that of 8 cm and in the axis of which a xenon blue region of the spectrum absorbs and is arranged in lamp (25), which has a light energy of Converting heat, such as substances in the 610 wattsec at the present distance from the colors blue-green, purple or yellow. 60 4 cm emitted. The exposure time is V2000 ^sec

The heat containing the blue-green substance The light is essentially composed of waves from the

sensitive material e.g. B. is composed of the visible range of the spectrum during exposure,

on the red parts of the original The exposed copy material can be easily processed

Make impermeable and hydrophobic. Way to be used as a printing form, the

Accordingly, the purple sub-copies are obtained by the fact that the processed punch containing layer on the green and the copy material is immersed in water - treat layer containing yellow substance on the lungszeit 15 seconds - and after removal of the water-blue parts of the original. Excess is pressed against a receiving paper,

which was prepared by treatment with a 1% aqueous iron (III) chloride solution.

6 black-blue copies of the original are obtained, which are produced by the reaction of the iron (III) chloride with the pyrogallol emerging from the liquid parts of the copying material. It is appropriate moisten the printing form again before each copying process.

Example 2

A 0.1 mm thick polyethylene terephthalate substrate provided with an adhesive layer is coated with the following casting solution (50 g casting solution per m ² ):

935 g of a 10% aqueous gelatin solution,
30 g of a 10% strength aqueous saponin solution, 30 g of a 3% strength aqueous solution of

Hostapon T (commercial product of Farbwerke Höchst AG),

5 g of a 4% strength aqueous formaldehyde solution.

After drying, the following casting solution is applied to produce the heat-sensitive layer (36 g / m ² ):

100 g of a 10% aqueous gelatin solution,
160 g of a 40% strength aqueous dispersion of

Polyethylene according to example 1,
8 g of an aqueous carbon black dispersion (100 g
of this dispersion contain 53 g of carbon black,
23 g water, 18 g glycol and 6 g nonylphenyl polyethylene oxide),
80 g of a 5% aqueous solution of Na-

trium tetradecyl sulfate,

5 g of a 4% aqueous solution of formaldehyde and
640 g of water.

Processing:

It is exposed as described in Example 1. The exposure energy was 0.8 wattsec per cm ² .

The exposed material is stretched in the usual way on a planographic printing cylinder and with the following Colored printing ink:

100 g of a carbon black dispersion of the above composition,

20 ml of an 80% aqueous solution of a partially etherified melamine-formaldehyde resin,

27 g of a copolymer of vinyl acetate and ammonium crotonate (95: 5),

27 g 1,5-hexanediol,
2 g of a 10 N ammonia solution,
6.5 g urea,

13 g of a 53% strength aqueous dispersion of a copolymer of butyl acrylate and vinyl acetate (1: 1),

80 g white spirit (boiling point 180 to 200 ° C),

20 g xylene.

Only the areas of the processed copy layer corresponding to the image parts of the original are through wets the aqueous colored phase of the printing ink.

The final prints are obtained in the usual way. Similar results are obtained if in the above-mentioned heat-sensitive layer, the carbon black dispersion by 30 ml of a 10% aqueous Dispersion of finely divided silver is replaced.

Example 3
5

The copy material according to Example 2 is exposed as described there, then moistened with water and pressing the heat-sensitive layer against a receiving paper. Both materials

ίο are as in F i g. 11 indicated by two rollers (37 and 38) out, wherein the one roller (38) that comes into contact with the receiving paper (36) is heated to about 35 ⁰ C. The two materials are moved at a speed of 10 cm / sec. The materials are separated behind the rollers, with a thin layer of the heat-sensitive layer being transferred imagewise onto the receiving paper. A copy of the original is obtained.

Example 4

The copy material according to Example 2 is exposed as described there, then moistened and the heat-sensitive layer in good contact with the dye layer of a hectographic color sheet brought, but does not contain the usual hydrophobic protective layer. After a contact time of about a minute, the layers are separated, in the places that the image parts of the original correspond, the dye layer is transferred. You get a reversed image of the original, that can be used as a printing form for spirit printing.

Example 5

Japanese paper (paper weight 14 g / m ² ) is dipped in the following solution:

^ ₀ 200 g of a 10% aqueous gelatin solution ^ 200 g of the polyethylene dispersion according to Example 1, 2.5 g of the carbon black dispersion according to Example 2,
40 g of a 5% aqueous solution of Na-

trium tetradecyl sulfate and
400 g of water.

After drying, the coated paper has a weight of 20 g / m ² . The paper treated in this way is exposed as described in Example 2 by means of an electronic flash. It is then immersed in a 5% strength aqueous solution of sodium lycylate, and the parts of the layer which correspond to the parts of the image of the original are washed out.

After washing and drying, a material suitable as a screen printing form is obtained.
55

Example 6

A cellulose triacetate film provided with an adhesive layer is coated with the following casting solution:

900 ml of a 10% aqueous gelatin solution, 30 ml of a 10% saponin solution,
30 ecm of a 5% aqueous solution of a g condensation product of oleic acid and

Methyl taurine.

After drying, a second layer is applied using the following casting solution (36 g / m ² ):

50 ml of a 10% aqueous gelatin solution, 80 ml of a 40% dispersion of polyvinyl chloride,

4 ml of the aqueous carbon black dispersion according to Example 2, 2.5 ml of a 4% aqueous formaldehyde solution.

It is dried and exposed as described in Example 2. The light energy is 1 watt sec per cm ² .

The processed material is immersed in a 5% aqueous solution of methylene blue, so that a reversed image of the original - viewed through the substrate - is obtained.

Example7

15th

A cellulose triacetate base, which is provided with an adhesive layer, is coated with the following casting solution (15 g / m ² ):

400 g of a 10% aqueous gelatin solution, 30 g of a 5% aqueous saponin solution, 30 g of a 5% aqueous solution of the

Densation product of oleic acid and methyl taurine,

10 g of an aqueous solution of formaldehyde, 200 g of a 10% aqueous silver dispersion.

After drying, a second layer is applied. The casting solution for this has the following composition (application 36 g / m ² ):

50 g of a 10% aqueous gelatin solution, 80 g of the polyethylene dispersion according to Example 1, 40 g of a 5% strength aqueous solution of sodium tetradecyl sulfate.

The material is exposed as in Example 6. The exposure energy is 0.9 wattsec per cm ² . After processing as in Example 6, an inverted copy is obtained.

Examples

On the gelatin subbing layer a cellulose triacetate film (7 g of gelatin per m ²⁾ is applied the following coating solution (36 g / m ^2):

100 g of a 10% aqueous gelatin emulsion, 160 g of the polyethylene dispersion according to Example 1, 20 g of a 5% aqueous solution of Na-

trium tetradecyl sulfate,

10 g pigment green B Colanyl dough (C.I. 10006), 715 g water.

Processing:

The material is processed as described in Example 2. The exposure energy is 1000 wattsec at a distance of 4 cm from the original. The exposure time is V2000 ^sec · T ^he graphic original contains black, blue, green and red parts of the image on a white background.

The exposed material is treated with a 5% strength aqueous methylene blue solution. The color penetrates only those parts of the heat-sensitive layer that. the black ones that do not reflect the light Parts of the image and the parts of the image of the original that absorb blue and red light, i. H. the green parts of the picture.

A reverse blue image of the black and green image parts of the original is obtained, which is legible through the document.

If the green pigment in the layer described above is replaced by Heliogen Blue B Colanyl Dough (C.I. 74 160) is replaced and exposed in the same way, all image parts of the original are replaced except for the red reproduced.

When replacing the green pigment with Permanent Violet RL Colanyl Dough (30% aqueous dispersion by Sirius Lichtblau FF 2 GL CI. 51300) a copy in which all parts of the image of the original are reproduced.

When using the planographic printing form, for example, the last-mentioned copy material such as described in example 2 can be used further.

Example 9

A polyethylene terephthalate layer (thickness 0.1 mm) provided with an adhesive layer is coated with the following casting solution (50 g / m ² ):

965 g of a 10% aqueous gelatin solution, 15 g of a 3% aqueous solution of a condensation product of methyl taurine and oleic acid,
15 g of a 10% aqueous solution of sa-

ponin and

5 g of a 4% strength aqueous solution of formaldehyde.

Then the following casting solution is applied to produce a heat-sensitive layer (36 g / m ² ):

50 g of a 10% aqueous gelatin solution, 80 g of the polyethylene dispersion according to Example 1, 128 g of a 7% aqueous solution of the following compound

SOoNa

/ y_

H ₉ N

SO;

NH,

NH,

1 DIi OLD

23 24

24 g of a 5% aqueous solution of the following compound

SO ₃ K SO ₃ K

/ ^N \

N C = O KO-C

H, C-C C = CH-CH = CH-CH = CH-C

'N
-C-CH ₃

124 g of a 5% aqueous solution of the following compound

SO ₃ Na SO ₃ Na

I!

.N,

, N.

HoC-C

C = O
= CH

-C

Ii c-

N
C-CH ₃

10 g of a 5% aqueous solution of sodium tetradecyl sulfate and 200 g of water.

The material is moistened as described in example 8 and further processed according to example 3.

Example 10

The following casting solution is applied to a cellulose triacetate film provided with an adhesive layer. (30 g / m ² ):

300 g of a 10% aqueous gelatin solution, 170 g of a 9% aqueous urea solution, 30 g of a 10% strength aqueous saponin solution, 20 g of a 3% strength aqueous solution of the sodium salt of the condensation product of oleic acid and methyl aurine.

Before casting, the pH of the casting solution is adjusted to 4 by adding aqueous hydrochloric acid set.

After drying, the following casting solution is applied (application 30 g / m ² ):

50 g of a 10% aqueous gelatin solution, 350 g of water,
90 g of a 35% strength aqueous emulsion of

Polyvinylidene chloride as below

specified was manufactured,
25 g of a 5% aqueous solution of Na-

trium tetradecyl sulfate,
4 g of the aqueous carbon black dispersion after

game 2.

Processing:

The above material is, as shown in FIG. 10 shown schematically, exposed. There is Copy material (30) from the base (31), the gelatin intermediate layer (32) and the heat-sensitive

Layer (33). The original is marked with (34). The exposure is carried out using the xenon lamp (35) (light energy 0.9 wattsec / cm ² ). The exposed material is slightly moistened with water at 22 ° C. and brought into contact with the heat-sensitive layer with a planographic printing paper consisting of a barytaised paper. The binding agent of the baryta layer is hardened gelatine (application 50 g / m ² ).

The two materials are as shown in FIG. 11 shown guided by 2 rollers at the same temperature. When the two materials are separated, the heat-sensitive layer is imaged on the receiving paper convicted.

The printing form obtained can be subjected to a flash exposure again and used as a printing form in the usual way Offset printing machines are used.

Production of the polyvinylidene chloride latex

The the following reagents included:

120 ecm of water,

32 ecm of a 10% aqueous solution of the sodium salt of the condensation product of oleic acid and methyl taurine,

160 ecm of a 10% strength aqueous solution of the following compound

-O- (CH ₂ CH ₂ O-) ₈ H

40 ecm of a 2% aqueous solution of

Potassium persulfate,
8 ecm of a 5% aqueous solution of

acidic sodium sulfate,
160 g vinylidene chloride.

409 524/329

25 26

In the above solutions, toning was used. This layer becomes the heat-sensitive

used to exchange demineralized water. Layer applied according to Example 2.

It is processed further as in Example 2 by means of a 60 ^{° C. water bath.} The light source with a stirring speed of 1000 rpm has an energy of 800 wattsec, which warms. After 30 minutes at this temperature 5 exposure time is 3 x 10 ~ ⁴ sec.
a pressure of 1.5 to 2 atmospheres obtained after about. .
3 hours begins to wear off. After a further 2 V ₂ B e ι s ρ ι e 1 13
Hours at 60 ⁰ C is created a vacuum in the autoclave A polyethylene terephthalate film (thickness 0.1 mm). The reaction mixture remains for is coated with the following casting solution (for a further hour in the autoclave, with an amount of 70 g / m ² ):
Room temperature is cooled. The received white

Latex has a pH value of 2. It is made by adding ²⁰ , § Po yhexymethylene adipate,

neutralized by 2 η sodium hydroxide solution. The yield of ⁴ SF ° ä ^s ° ^butylene ( ^average molecular weight

Solids is 35%. ". ^ 0O), ■

₁₅ 200 g of methylene chloride.

Example 11 The following layer is then applied

A polyethylene (application 35 g / m ² ) provided with an adhesive layer:

terephthalate underlay (thickness 0.1mm) is marked with the "". , .... ". ",

the following casting solution coated (application 30 g / m ² ): ¹⁰⁰ S of the aqueous dispersion of polyethylene

^nac h B ^ice P! el I

55 g of a 10% aqueous solution of 600 g of water,

Polyvinyl alcohol, 5 g of the aqueous carbon black dispersion after

22 g of a 10% aqueous solution of poly game 2,

vinylpyrrolidone, 25 g of a 5% aqueous dispersion of

120 g of a 20% strength aqueous dispersion of sodium tetradecyl sulfate.

Polyethylene (40 g partially oxidized poly- _{The material} ^ _{as described in ßd id u}

ooÄ ^g ? T British Patotttschnft exposed and further processed.

997 135, average molecular weight 7000; _{When separating the} planographic paper from

Melting point 125 to 130 C; Acid number on _{the exposed} recording material imagewise

^ bisaOjn ^ gn-Itocadecyloxy.decaoxy. _{30 the} heat-sensitive paper transmitted

ethylene and 150 ml of water), the _{high layer can be warmed to m} o _{C and mjt} £ _erro _

. _n £, ^as l ^er n · ,. . , ™. . , “Magnetic iron powder be sprinkled. That

40 g of the carbon black dispersion according to Example 2, _{powder b} , _{ejbt haf and man h} -, _{d magnetic}

18 g of a 3% aqueous solution of Na printing plate

trium tetradecyl sulfate. ".

Example 14

On a polyethylene-laminated transparent paper, "

It is exposed as indicated in Example 1. That was exposed to a corona discharge, ^

The light source has an energy of 800 wattsec, which is applied to the following casting solution (order

Exposure time is 3 · 10 ~ ⁴ sec. 40 36 g / m ² ):

After exposure, the heat-sensitive “. . ",. .. ". _T .., _T ,
Layer rubbed with an ethanol-soaked cloth made of 30 ecm of a 5% aqueous solution of Kon-cotton, the unexposed densation products of oleic acid and parts being removed. The same result is obtained _nnn methyltaiirine; ^ _1. , ..
with a rag soaked in benzene. 45 ⁹⁰⁰ _n ^{ccm e} ! ^ner] _n ° £ ß ^en aqueous gelatin solution,

30 ecm of a 10% aqueous saponm solution.

B e i s ρ 1 e 1 12 The following layer is then applied

A polyethylene terephthalate film (thickness 0.1 mm), (36 g / m ² ):

which is provided with an adhesive layer is marked with the “,. _{Λη0 /} ~ _n ■ _T ·· ^

following coating solution coated (application 50 g / m ² ): 50 50 ^ml f ⁱⁿ . ^he 10% aqueous solution of Ge,

^{v b bl} ' latme,

935 g of a 10% aqueous gelatin solution, ^{80 ml of} a polyethylene dispersion after

30g of a 10% aqueous saponin solution, "^ ^pi ..""."",. . , _D.

30 g of a 3% aqueous solution of Na ^{4 ml of} the aqueous carbon black dispersion after adding

trium salt of the condensation product 55 """", ^ P ^iei2 >

from oleic acid and methyl taurine, ¹⁰⁰ ° ^{ml water}

5 g of a 4% strength aqueous formaldehyde is exposed and processed as in Example 3

solution. described.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1. Process for the production of photographic images by imagewise changing the water permeability or solubility of a heat-sensitive layer of a recording material, its heat-sensitive layer, hydrophobic polymer particles dispersed in a hydrophilic binder contains, wherein the polymer particles are in thermally conductive connection with one or more substances that are responsible for the imagewise Exposure of the recording material used to absorb light and convert it into heat are able to, and during the exposure an original can be heated by this light Image parts with these image parts in thermally conductive contact with the heat-sensitive Layer is held, the water permeability and solubility of the recording layer is reduced so far that the parts of the corresponding to the image parts of the original heat-sensitive recording layer can be selectively washed out, characterized in that that electromagnetic radiation from the visible and near ultraviolet range is used for exposure and at most 10-> see is exposed. 2. The method according to claim 1, characterized in that a light is used for the exposure, which consists essentially of wavelengths of less than 700 ηημ and less than 10 ~ ² seconds is exposed. 3. The method according to claim 1, characterized in that an electron gun or a gas discharge lamp is used for exposure and 10- ² to 10- "see is exposed. 4. The method according to claims 1 to 3, characterized in that it is exposed ^{to a light intensity of at least 0.3 watt per cm 2.} 5. Process according to claims 1 to 4, characterized in that a heat-sensitive Layer with an optical density of 0.25 to 0.78 used for the actinic light and the Exposure is carried out in reflex.