DE1571816B2 - Process for making photographic images - Google Patents

Description

The present invention relates to a method for recording or reproducing information with the aid of electromagnetic radiation and a heat-sensitive material containing at least one heat-sensitive substance in which at Exposure to electromagnetic radiation generates heat.

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, the binder of

the particles in their permeability and / or fat

, friendliness differs. The “material delivers permeable and impermeable urid / bde'r hydrophilic and hydrophobic sites in an image-wise distribution.

For the purpose of image generation, the recording material is used in accordance with the above-mentioned 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 is a process for the production of photographic images by imagewise Change in the water permeability or solubility of a heat-sensitive layer of a Recording material whose heat-sensitive layer is dispersed in a hydrophilic binder contains hydrophobic polymer particles, the polymer particles in thermally conductive connection with a or more substances which are used for the imagewise exposure of the recording material Able to absorb light and convert it into heat, and being able to do so during exposure an original with image parts that can be heated by this light with these image parts in thermally conductive Contact with the heat-sensitive layer is maintained, and whereby the water permeability and solubility the recording layer is lowered so far that those corresponding to the image parts of the original Parts of the heat-sensitive recording layer can be selectively washed out, the

. characterized in that electromagnetic radiation from the visible and near ultraviolet range is used for the exposure and is ^{exposed at most 10 ~ x} see.

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.
For the exposure an electromagnetic one is used

So radiation is used whose main part (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 ^-4 be see.
The inventive method is based on one

3 4

The particles are in thermally conductive contact with the drawing material, with its properties, with one or more substances, including 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 It will, however. 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 exposed in a weight ratio of 3: 2 in a hydrophilic and debinding agent as positive or negative 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. Purpose of the recording material, with the principle of the recording method according to 35 other words of how the record read of the invention can be briefly represented as follows: or is to be developed. From the further description, the recording layer consists of a fil · writing that the distributed, hydrophobic thermoplastic polymeric process according to the invention is suitable for 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 moderately moistened with an intense electromagnetic beam, then the temperature in the speed of the recording material rises suddenly and changes the areas that are advantageously exposed in such a way that the physical properties are directly affected by the light source the shift. This change in physical properties 5 ° physical properties of the heat-sensitive material can be practically not or only slightly changed in various ways for the production of material. Use pictures. The methods possible for this The image-wise reflected light is then described in the following: Material the practically usable image differences following steps: For reflex exposure, the coating of the

Recording material be sufficiently transparent.

1. Provision of a drawing material which it is favorable for the fluoroscopy procedure to

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.

5 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

FIGS. 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 Fig. 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) 40 impregnated carrier material suitable, for example a And the dispersed particles of a hydrophobic Japanese thermoplastic commonly used for the production of stencils Polymers (3) and particles (4) paper.

contains one or more substances that are electro- although so far only in detail only radiation-magnetic Absorb radiation and heat-absorbing substances in finely divided form (im can convert into a hydrophilic binding 45 dispersed state) have been described, medium (5). these substances can also be incorporated in other ways

F i g. 2 shows a recording material being put into shape, for example as a solution or as a unit ¹

a self-supporting sheet (6), consisting of a borrowed 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; but which also destroys synthetic, hydrophilic polymers, such as by heat can be. The heat-sensitive material, for example, polyvinyl alcohol, polyvinylpyrrolidone, potential can also, as shown in FIG. 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 Polymsren.

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 agendas which, together with the colloid, affect 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 Kü c h 1 e r s "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. Substances of the recording material which may be mentioned as examples include 4 ° 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. 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 ⁰ 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.), are a part of the Chimie Macromoleculare work - buffer system , surfactants and wasneralites, from Georges Champetier, Librairie ser-soluble catalysts, e.g. B. hydrogen peroxide Armand Colin - Paris Vem, pp. 194 to 198 to find. 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 ηιμ, 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 natural adhesive forces between the binder-free oxidation of polyethylene with an average layer and the base 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 polymer particles to each other and to the Un- are melted between 130 and 150 ° C. On the base, without affecting the porosity of the layer of molten polyethylene, the mechanical strength increases. 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

mainly 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 an 800 cc 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 up to 150 ⁰ 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 therm o-

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

Experienced 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

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. 3 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

Thickness and distribution of the coating composition are of practical interest, e.g. B.

possible. 25 pigments, dyes, reaction components for the

In the case of a recording material that consists of dye formation, developer substances, reaction heat-sensitive layer on a base or dyes, which preferably stand, this base can be distilled or sublimed below 80 ° C. for the intended use, and can be rigid or flexible according to the material. Development nuclei for the silver salt diffusion agent can also be permeable or impermeable, 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, the 4 °. 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 the less affect it

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 5 ° 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 ~ ⁴ to

Silver that can be etched away. Delivers 10 ~ ² 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, light-sensitive 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 components,
nents, which preferably distilled below 80 ° C. 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. Thus, for example, punch is suitable to incorporate, which is decolorized by a bleach, a gas discharge lamp with a power of which in the areas of the 40 wattseconds that have remained permeable for copying 6x6 cm 5 recording material, and 6x9 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 that it can be transported 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

by making it possible to reproduce originals, the material diffuses 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

15 16

able to diffuse through. A recording layer is obtained on this carrier. as

Way a printing template, with the help of which several carriers are suitable Japanese paper (Yoshino paper),

Copies of an original on a transfer material nylon fabric with a mesh size of 0.2 to

can be produced. 0.08 mm or bronze fabric (see Example 5).

The membrane can also be used for production.

Electrolytic prints are used, since the mem- brane is known only at the open (permeable) places

brane reach the print carrier in contact with one of the tissue acting as an electrode. These

Receiving material, the electrolyte only in the open places, is obtained by the method of

leaks through, with the result that on the present invention ^: by washing out or

the electrode material an image-wise electro-io etching away of the recording layer at the points,

lytic deposition of the imaging substances that have remained permeable or hydrophilic,

he follows. According to a third system, they become permeable

According to another system, the permeable and hydrophilic areas in moist and / or permissible and soluble areas of the warm state are transferred by pressing on and tearing out sensitive material, for example by extracting it onto an image receiving material,
wash or by breaking down the hydrophilic binding- This transfer process is then possible, if by means of, removed. In this case, the cohesion of the receiving material can be greater than that of the receiving material, a dye, for example a pigment (which dyes the permeable areas of the recording layer) or a dissolved dye, and if the adhesion is maintained between the permeable ones, so that if the image areas are treated with 20 places and the receiving material is stronger than that of a liquid, a reproduction of the original cohesion of the permeable areas of the record is produced. material is.

When using this system one arrives at After compressing a moistened

a gravure printing stencil, if the heat-sensitive and imagewise exposed recording material with

Recording layer on an etchable metal under- 25 a receiving material, which is preferably a hydro-

position is attached. After removal of the permeable and / or porous surface, and then

Permissible and hydrophilic parts of the recording bend the separation of the two materials is obtained

materials, for example by washing out, can be a satisfactory transfer printing. In this case

the uncovered metal surface in an imagewise manner contains the recording material preferably

etching. According to this method, for example, neither a recording layer which is a hydrophilic

printed circuits are manufactured. After containing binder in which the hydrophobic thermo-

the remaining parts of the recording layer, plastic polymeric particles are dispersed, or

for example with the help of an organic solution a recording layer, which consists of a porous

means removed, the etched metal plate is built up layer by layer of said polymeric particles

ready for use as a gravure matrix. 35 is on a hydrophilic, preferably a colloidal

According to this process, a simple layer with considerable swelling capacity can be used.
Washing off the permeable and hydrophilic parts. The transfer method of the heat-sensitive recording layer, which is the opposite of the transfer method, is also possible when the adhesiveness of the sub-letterpress forms is established. The washing punch in the contact material - here as a transfer process, in this case, if necessary, the 40 designated material - _; smaller than that of the substance; The remaining parts of the recording material in the permeable areas of the recording layer are hardened. In this way one obtains a is and if the adhesion between these through-relief image. casual places and the transfer material stronger

If the recording layer is on an electrical one than that of the substance of the transfer material. then

Well-conductive underlay, such as aluminum 45, for example, can be a carbon paper with a little

nium, is attached, it can be turned into an electro-hydrophobic surface, as is the case for the one in the

make static pressure plate. Described by washing out Belgian patent specification 600 508 "

the permeable areas of the recording layer are used to drive against the moistened image

the electrically conductive substrate is pressed onto the moderately exposed recording layer

cleared image exposed accordingly. They stand 50. Remain after peeling off the carbon paper

The remaining parts of the recording layer have the permeable ones on the recording material

then a much higher electrical resistance and hydrophilic points corresponding parts of the

stood as the conductive pad. As a result, the coat of paint returned. The hydrophilic binder des

arises from the electrostatic charging of the recording material, can "before ^:

drawing material a charge image. This la- 55 be swollen ',' so ^; that a relief picture

creation image can either be created using known processes, which have a closer contact with the color

for example, with the help of a powder, developed layer enables. . . '..

or for the electrostatic transfer printing to an iso-

lierendes transfer material are used. graphic transfer originals are produced when

In addition, the recorded material treated in this way can be a hectographic tion material also for the production of conductive dye, which is soluble in alcohol, or a images can be used. Such materials are reaction components which, together with a second component and their application are described in the Belgian patent component, e.g. B. in a liquid or a headline 589 996 and 599 628. carrier material, can form a dye.

Another possible application of the described 65 By modifying the / third system

benign system consists in the production of schema to achieve that the unexposed areas of the

blonen or screen printing stencils. For this technique heat-sensitive material together with a

one or both sides of the permeable layer of softened polymer are applied to 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 676898)

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

One of the colors blue, green and red suitable for the process described here, three separate recording material is shown in FIG. 8 shown. The 15th heat-sensitive materials used, which are sensitized for material consists of a heat-sensitive yellow, purple and cyan or «layer 1 on a polymeric layer 10 with a blue, green and red dye in the softening point, which is below the temperature heat-sensitive layer ,
lies in which 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 ". ,. , _{n /} . .. ". ^, ...
and can be converted into heat in a hydro- a ₅ fS "^" .2 ⁰ If ™ ^wass "? ^en gelatinous solution, philic binder 5. ¹⁰ ° ^{ml emer 105} ^ aqueous pyrogallol-

According to a further system, it is possible for ..,. ^ung ™ ;.

Use of a low-melting substance (e.g. ^{20ml emer 11} ^ S * aqueous sapomn solution

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

this dye is made up by melting the recording 30 ¹⁰⁰ ° ^{ml with water} .

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

time is to be transmitted. 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 _{An /} . ,. "" .. .. ". _,,. ,

Printing ink (in this case using a JOOm of a 3% aqueous gelatin solution,

Dampening system) or with a printing ink made up of ¹⁶ ° ^ml ™ * 5% «gen aqueous emulsion of

the mixture of a colored aqueous phase with J ° ^{lvathv 1} ^ ( ^ΚθΓη , Α S ⁶¹ Sf _n Sx ° '^1μ;

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

Phase exists. In this context, for 40 ^{140 ml} ™ ^Q \ ³ ^ ¹ F ^{1 wa} ß "g ^{en Lo} ™ * S one

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

Multicolor images can Metnyltaunn ^and _o when using a heat. '"" _ ,.

sensitive material can be obtained from ^{1 ml of} a 50% aqueous carbon black dispersion,

consists of more than one thermosensitive element. The above copy material has after drying

So it is z. B. possible, at least two colors of a 45 NEN a density of 0.27.
to reproduce subtractive mixing. One use

For this purpose, a recording material from the above processing is required:
As indicated schematically in FIG which contains a red dye, and the other side of which is duplicating original (21), which carries a light-absorbent, heat-sensitive layer with a green colored image part (22) and a reflective background 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,

19 20

that by treatment with a 1% aqueous the carbon black dispersion by 30 ml of a 10% aqueous

Iron (III) chloride solution was prepared. rigen dispersion is replaced by finely divided silver.

There are 6 black and blue copies of the original

obtained by reaction of iron (III) chloride Example 3

with that from the liquid parts of the copy material 5

emerging pyrogallol arise. It is appropriate- The copy material according to Example 2 is as there

moderately, before each copying process, the printing forme is exposed, then exposed to water.

moisten again. moistens and the heat-sensitive layer against

a recording paper pressed. Both materials

B e i s ρ i e 1 2 io are as in FIG. 11 indicated by two roles

(37 and 38) out, the one roller (38) that

A polyethylene coated with an adhesive layer comes into contact with the receiving paper (36),

Terephthalate pad 0.1 mm thick is heated to around 35 ° C. The two materials

coated with the following casting solution (50 g casting at a speed of 10 cm / sec

solution per m ² ): 15 moves. Behind the roles are the materials

. "_. ..... .... ...... separated, with a thin layer of heat-sensitive

935 g of a 10% aqueous gelatin solution, _find i n _cozy layer imagewise to the receiving paper

30 g of a 10% strength aqueous saponin solution is _transferred . _{This is a copy of the} original

30 g of a 3% strength aqueous solution of obtained

Hostapon T (commercial product of the coloring ₂₀

werke Höchst AG), example 4
5 g of a 4% aqueous formaldehyde

solution. j) _as copy material according to Example 2 as there

After drying, the process described is exposed to light, then moistened and

heat-sensitive layer the following casting solution 25 the heat-sensitive layer in good contact with

applied (36 g / m ² ): the dye layer of a hectographic color

, ". . ..... .. ". _...... brought film, but not the usual hydrophobic

Contains 100 g of a 10% aqueous gelatin solution, protective layer. After a contact time of

160 g of a 40% aqueous dispersion of _{about one minute, the layers are} separated,

Polyethylene according to Example 1 _{30 wherein in the} places that the image parts of the original

8 g of an aqueous carbon black dispersion (100 g correspond, the dye layer is transferred,

this dispersion contained 53 g of carbon black _{is obtained ejn se} i _tenver inverted image of the original,

23 g water, 18 g glycol and 6 g nonyl - _{the a} , _{s printing form used for} spirit printing

phenylpolyethylene oxide), _{can be}
80 g of a 5% aqueous solution of Na-

trium tetradecyl sulfate, example 5

5 g of a 4% aqueous solution of Japanese paper form (paper weight 14 g / m ² ) is in the

* " _Ft ä ^deh y ^{d and dipped the} following solution:
640 g of water.

■ 200 g of a 10% aqueous gelatin solution ^

Processing: ⁴²⁰⁰ g of Polyäthylendispersion according to Example 1,

It is exposed as described in Example 1. The i ' ^5gder ^ dispersion according to example 2,

Exposure energy was 0.8 wattsec per cm ² . ⁴⁰ S ^{or 5} % f ⁿ aqueous solution of Na-

The exposed material is applied in the usual way. tetradecyl sulfate and

stretched a flat printing cylinder and with the fol- lowing 45 400 g of water.

colored printing ink: After drying, the coated paper has

"""."",. . , a weight of 20g / m ² . The paper so treated

100 g of a carbon black dispersion of the above is _{described as in Beisp} ^ ₁₂ using a

Composition,. . Electron flash lighted. Then in

20 ml of an 80% aqueous solution of a _{5% aqueous solution of sodium lycylate}

partially drained melamine formaldehyde dipped! and the layer parts corresponding to the image parts of the

narcissus, ·., ·, <.! Originals are washed out.

27 g of a copolymer of vinyl acetate and _{After washing and drying, a sieve is used} .

₀ _ Ammonium crotonate (95: 5), material suitable for printing.

27 g 1,5-hexanediol, ⁶

2g of a 10η ammonia solution, _n ■ .., ·. _Λ

6.5 g urea, example b

13 g of a 53% strength aqueous dispersion of a cellulose coated _{with an adhesive layer}

Copolymers of butyl acrylate and vitriacetate _{film is} loaded with the following casting solution

ethyl acetate (1: 1), ₆ layers

80 g of white spirit (bp. 180 to 200 ⁰ C), scnicntet.

20 g xylene. 900 ml of a 10% aqueous gelatin solution,

Only the ^ O ml of a 10% saponin solution corresponding to the image parts of the original,

Areas of the processed copy layer are replaced by 30 ecm of a 5% strength aqueous solution

wets the aqueous colored phase of the printing ink. 6 ₅ condensation product of oleic acid and

The final prints will be methyltaurine in the usual way.

obtain. Similar results are obtained if, after drying, a second layer is applied

of the heat-sensitive layer given above, the following casting solution was applied (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 ic 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

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 me-

thyltaurine,

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, a reversed 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,

1Ö g pigment green B Colanyl dough (C. I. 10006), 715 g of 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 72000 ^sec . The graphic original contains black, blue, green and red image parts 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 from Sirius Lichtblau FF 2 GL C. I. 51 300) one receives a copy in which all image parts 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

SO, well

H ₂ N

SO

NH ₂

NH ₉

i DIi O

23 24

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

SO ₃ K SO ₃ K

N
H, C - C

C = O

■ C = CH

CH = CH

KO-C N

CH = CH - C C

-CH _S

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

SO ₃ Na SO ₃ Na

H ₃ C-

C = O
C = CH

HO-C '

Ii c- CH _a

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

35

40

45

The material is exposed as described in Example 8 and processed further as in 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 taurine.

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% aqueous emulsion of polyvinylidene chloride, as described 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

55 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 using a flat 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% aqueous solution of the following connection

Γϊι QwQ O- (CH ₂ CH ₂ O-) ₉ 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 case of the above solutions, ions were used. This layer becomes the heat-sensitive

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

It is by means of a warm water bath 6O ⁰ C is further processed as in Example 2. FIG. With a stirring speed of 1000 rpm, the light source 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. · Ι ι?
3 hours begins to wear off. After another 2 Va Example 13
Hours at 6O 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 ² ° § polyhexymethylene adipate,
neutralized by 2 η sodium hydroxide solution. The yield of ^{4 % butylene} ( ^mean molecular weight

Solids is 35%. ". Vl ⁰ ^ ⁰ ] '... ,

^{/ 0} 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) with the , nn ι -r> · τ-χ · · ™ ι ·· ι ·

following coating solution coated (application 30 g / m ² ): ¹⁰⁰ S ^ £ Φ * ₁ ° ¹⁵ Ρ ^{6Γ81οη made of} polyethylene

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- _{Das MaterfaI} ^ _{as described in Bd id n}

oo7 ^{y <} £ ^ge T Briüscher patent specification 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

26 to 30; 12.4 g of n-hexadecyloxy-decaoxy- _{30 the} flat printing paper transferred heat-sensitive-

ethylene and 150 ml of water), a _{layer k} J _{n warmed to m} » _{c and treated with ferro} .

/ U g of water, "..__ magnetic iron powder to be sprinkled. That

40 g of the carbon black dispersion according to Example 2, _{powder b] eibt} ^ _{and one obtains magnetic ones}

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

trium tetradecyl sulfate. ,. '

; Example 14

Processing:. . . , .. ,,,,. ^ ■

On a polyethylene-laminated transparent paper,

It is exposed as indicated in Example 1. Which was to be 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> r}

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 gets _nnn ¥ ^είη ^^. ^Γΐη '.. ". ^ _1. , ..
with a rag soaked in benzene. 45 ⁹ ^ ^{ccm e} ! ^ner 1%> in aqueous gelatin solution,

30 ecm of a 10% aqueous sapon solution.

B e 1 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, _Λ . . _{Ληο /} . . .. ". _τ .. ~

the following casting solution coated (application 50 g / m ² ): 50 ^50ml «» «10% aqueous solution of Ge,

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

30 g of a 10% strength aqueous saponin solution,. , ψ .. '". "",. . , _Ώ .

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

trium salt of the condensation product 55 . _nnn , ^ P ^ie12 '

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

5 g of a 4% aqueous formaldehyde- It is exposed and processed as in Example ^

solution. described.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1. A method for producing photographic images by imagewise changing the water permeability or solubility of a heat-sensitive layer of a recording material whose heat-sensitive layer contains hydrophobic polymer particles dispersed in a hydrophilic binder, the polymer particles being in thermally conductive connection with one or more substances which are for the imagewise exposure of the recording material used to absorb light and convert it into heat, and during the exposure an original with image parts heatable by this light is kept with these image parts in thermally conductive contact with the heat-sensitive layer, the water permeability and solubility of the recording layer so is greatly reduced 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 for the B elimination electromagnetic radiation from the visible and near ultraviolet range is used and no more than 1O ^-1 see is exposed. 2. The method according to claim 1, characterized in that a light used for the exposure, which essentially consists of wavelengths of πιμ below 700 and less than 10- ² lake is exposed. 3. The method according to claim 1, characterized in that an electronic flash or a gas discharge lamp is used for exposure and 10 ~ ² to 10- ⁴ seconds 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. The method 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.