DE1447736A1 - Heat developable two-part diazotype copier material and process for making the same - Google Patents

Description

Two-component diazotype copy material that can be developed using noise and the process for its manufacture

For the production of blueprints according to the diazotype copying process, herds practice two methods, the so-called dry process and the so-called semi-moist process. In the dry process, the copy material in the light-sensitive layer contains both a dlazo compound and an aso component, and the development of the exposed copy material is made with ammonia gas. In the semi-wet process, the copy material in the light-sensitive layer contains a diazo compound, and when developing, in an outer or alkaline solution, an asecoaponent is applied to the exposed material and, in turn, the unexposed areas of the layer by coupling the azo component a JhH & t & witäQtf- ' formed » riecßS ^^"

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The disadvantage of the usual development of blueprints is, on the one hand, the serious nuisance caused by the ammonia gas used in the drying process, on the other hand, the semi-humid process requires the use of another. Bathing with the A ^ ocomponent requires a great deal of effort, especially in terms of apparatus. Therefore, soon after the diuzotype process had been introduced, attempts were made in technology to achieve a simpler development process 2; u and xx ^: i i'arbst : i * ^ ± ~; dung by means of action of water vapor or "» V'arme ^^: ζ ilöaen »

I> er Kuppluiignprczööe ei r- ^x J'i azov ;. ¹ "/: .... ηά ··:" ^1. ^; ^T i.Lt a hydroxy-: ι '/ φ: -. Nha - "': j ^ en. ^ O-ronporjeri; .. * ν erlä'.af ^J j knownex · - maene ;. ^ y Iu & 1 : calicohe'i V-ia neutj. h \ er d. -area smooth. The Liinnt-r au ^J dem ΰ-ebiet cie ^ ¹ Wfirmyo ..tv.'J.ei ·: ji.i'g known proposals iii- .?. .IEN demnscii · ^ς - & - ο; ... ΐ addition, by increasing the temperature, gegebtaenfalls ^ NTAR Mltverwendvng suitable .V-vuätz.e, the p value in ^ (lev photosensitive layer from the acidic neutral inb ¹ Dz ^ < ej kai la ehe ^ ebiet to postpone, This la.-3t eich can be achieved by removing a volatile acid or by developing substances with an alkaline reaction from non-alkaline substances mostly in special layers either

between the photosensitive mixture and the support thereof Layer or on that of the photosensitive layer

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applied away from the side. Ai has a disadvantage here from »that either the shelf life of the entire copy material β because of the close proximity of the p ^ -changing Layer suffers or the copy quality is impaired because the carrier material is not easy to penetrate will.

An object of the invention is a two-part heat developable diazo print material consisting of made of a carrier material which can be provided with a primer and which has a layer on at least one side from a photosensitive mixture of a diazo component, an azo component and optionally additives, characterized in that at least one compound is distributed throughout the carrier material which contributes The action of heat through the support creates a neutral or alkaline medium in the photosensitive mixture generated, whereby this compound can also contain additives.

Another object of the invention is a method for Production of the copy material according to the invention by Coating a carrier material with a photosensitive mixture of a diazo and an azo component, optionally with additives, with at least one primer being applied to this carrier material beforehand can. This method is characterized in that

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at least one compound, optionally with additives, is added to the carrier material during its production that when exposed to heat in the photosensitive Layer creates a neutral or alkaline environment.

The materials commonly used in the diazotype can be used as the carrier material. When selecting the carrier, it has proven to be advantageous to ensure that it is heat-permeable to the compound producing the environment in the photosensitive mixture or its cleavage products} Carriers that meet this requirement are, for example, paper, preferably types of paper with a square meter weight of 50 to 180 g, as they are commercially available as blueprint base papers. Transparent papers can also be used for the purpose according to the invention.

Compounds which are contained throughout the carrier material and which, when exposed to heat through the carrier , generate a neutral or alkaline environment in the light-sensitive layer, are mentioned! These are unique compounds that do not show any neutral or alkaline reaction from the outset and only turn into products that have a neutral or alkaline reaction when heated, for example through decarboxylation or cleavage.

“AD OfIlGiNAL

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As environment-changing compounds that can be used in the sense of the invention, we mention, for example, "The mono-amides or oligo-amides of organic, aliphatic mono- or polyvalent carboxylic acids with straight or branched carbon chains of up to about 15 carbon atoms, such as those of acetic acid, mono- , Bi- and tri-alcoholic acid, the diazides of carbonic acid, oxalic acid, fumaric acid or succinic acid. The amides of acids which still have one or more hydroxyl groups in the aliphatic chain, such as the amide of malic acid, tartaric acid, citric acid, hydroxyacetic acid, hydroxybutyric acid, lactic acid, are particularly suitable. The corresponding alkyl ethers of these hydroxycarboxylic acids, such as, for example, the amide of 2-methoxyacetic acid, are also suitable.

Small amounts of acids such as trichloroacetic acid, vinylphosphonic acid or, above all, organic compounds that decompose when heated by decarboxylation and form anhydrides or ketones can be used as additives » which significantly increase the desired effect - creating a neutral, ivy or alkaline environment , and thus lose their acidity. Solo compounds are also B-keto acids, such as pyruvic acid, e * -hydroxy acids, such as lactic acid and malic acid. Above all , these compounds have proven useful as additives in such amides "in which the decomposition temperatures are relatively

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are moderately high, which makes these compounds their effectiveness can develop even at medium temperatures.

The incorporation of the above _f carried out a neutral or alkaline environment generating substances advantageously over all other process steps for the preparation of the inventive heat copy paper "to be particularly effective incorporation has been shown these substances in the not yet dried carrier material, for example a paper web during the manufacturing process on the paper machine. This ensures that these substances penetrate the entire depth of the carrier material and are therefore already present at an optimal distance from the point where they are to develop their effectiveness during the subsequent heat copying process, so that these substances or their cleavage products only short diffusion paths have to be covered. Since they are not concentrated on the side that will later bear the photosensitive mixture, as is customary with the previously known processes, the storage life of the copying material is significantly increased by preventing the premature reaction between the diazo compound and the coupling component »

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You in general and also for the inventive The papers used in the case almost always have a strong glue that prevents the penetration of More or less inhibits water and aqueous solutions This type of gluing is known. This inhibiting effect of the paper sizing occurs in the course of the paper manufacturing process. process only begins towards the end of the paper drying process. Through this, that the incorporation of the substances that create a neutral or alkaline environment when heated is carried out before the final drying of the base paper, is achieved, that the penetration of the carrier material with these compounds is very smooth, complete and, above all, evenly runs. For this work step, for example, all stations of the paper machine where the paper is no longer suitable are suitable mechanically, but only dried by heating to the point at the end of the dryer section at which the full glue effect of the paper glue is developed. Suitable Application devices are therefore possibly the last cheese press and all application devices within the dryer section of the paper machine. As such may be mentioned preferably roller applicators, e.g. the well-known Lelm presses of various types and their Further developments, also other application processes, e.g. Air brush applicators, drag scraper devices, etc. can according to the invention for impregnating the paper web in serve as set out. The amount of on these catfish

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incorporated substances that are used to generate the environment can vary within wide limits! E.g. it has Proven to be beneficial, about 1 - 51, preferably 1.5-3 the theoretically for the full neutralization of the photosensitive Layer required molar parts of this compound to be used.

For special purposes, only a second step can be used a separate line on the front side, an application of small amounts of a heat-decomposing one Substance that creates a neutral or alkaline environment can be made without this being necessary. The amount of the hot alkaline reaction to be applied to the front, Substances should be kept within low limits, i.e. about 0.1-0.5 molar parts of the required compound, the for theoretical full neutralization of the other components on the one printed with the photosensitive mixture Page are required «

On this second line or the one that is not additionally triohened Now comes the order of the light-sensitive paper carrier Mixture of the diazo and aeocomponents and, if applicable, those commonly used in the diazo type There are additives

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Good results according to the invention are achieved if the carrier material is provided with a precoat which prevents or at least inhibits a Sindriogen of the photosensitive mixture of the diazo and azo components from the surface into the carrier. These properties of the primer may only be used with regard to the light-sensitive! Mixture apply. The above-mentioned precoat must not inhibit the penetration of the alkaline substances or their decomposition products through the carrier. This fact is generally easy to achieve, since, for example, the particle size of the azo or diazo components is slightly larger than the particle size of the compounds incorporated in the mass of the carrier or their cleavage products.

Vorstrlchmassen that fulfill the stated purpose are, for example. Oelluloeederivate, such as carboxymethylcellulose, Hydroxymethyläthyloellulose, or sodium or ammonium alginate, organic condensates, such as products from formaldehyde-urea or urea-glycerin. And many synthetic resins used in the paper industry for the surface treatment of paper, like that of the Cyanamid Comp.

(R) gebraohte in the Bändel ACCOBOND ^v 'or a polyamide

(Ά \ derlTat, Üurotez ^v ', alkoxymethylperlon, a polyamine

Bpoxydhars "which is brewed by the Bayer-Leverkusen company under the name ladarln " ^ on the market, Polymethyl-

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Silicic acid in the form of the sodium salt, as it is e.g. from the Wacker Chemie GmbH, Munich, is marketed under the name »Building protection agent BS 10, finely divided silica with a particle size between 0.2 and 10 / U, especially in connection with rice or Oat starch. Combinations of these materials have also proven useful. Many of them, such as this sucked Building protection agents BS 10 simultaneously increase the contrast of the developed images »

In the case of the above-mentioned primer materials, for reasons of solubility in ^ orm of their alkali or ammonium salts can be applied, such as the aforementioned BS building protection agent and the alginate, one must ensure adequate neutralization. That can be done by the light-sensitive preparation a corresponding amount Adding acid or by the fact that the precoated material is applied before the photosensitive layer is applied with an intermediate coat of an acid, or that one pre-paints with an aqueous solution of an acid and the solution of the substance to be neutralized applies as a further line. It is also possible to use the precoat solution, the these alkali-or ammonium salts and besides

finely divided pigments ZoB, of silica, about Aeroeil ^ ' from DEGUSSA, Frankfurt, contains acidifying before applying.

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For example, aqueous solutions of trichloroacetic acid, hydrochloric acid, vinylphosphonic acid and the like have proven particularly suitable for the aforementioned neutralization. One can by allowing different the time between the attachment of the neutralizable Yorstrichmateriales and the neutralizing acid gross selected, for example, in that one applies the coating machine, the preliminary and main line in one operation different, can be run quickly, or that the drying temperature after applying the primer selects different levels , achieve that the primer material is drawn or penetrates more or less deeply into the paper pulp

This effect, which is brought about by the application of these precoats , supports the maintenance of the good photosensitivity of the copying material according to the invention even during prolonged storage times, since the photosensitive substances are held close to the surface of the carrier material. In the case of Diazoty pie layers of the usual type , a fairly rapid decrease in light sensitivity is observed.

Ala Diazo and azo components in the photosensitive mixture can be all compounds known and customary for copying purposes. Particularly good

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suitable are, for example, as diazo components _c 4-dimethylamino-benzenediazonium, 4-diethylamino-benzenediazonium chloride, 4_N_äthyl-N * _{thydroxy-äthylamJno-benzenediazonium)} 4 - morpholino benzenediazonium chloride or 4-pyrrolidino-J-bromo- benzene diazonium chloride.

As azo components are suitable. 2 _# ; 5-dihydroxynaphthalene-6-sulfonic acid, 2-hydroxy- (N-dimethyl) -naphthoic acid amide- (3) »2-hydroxy-benzotriazole ~ (1.2), l _e 3.5-resorcylic acid diethylamide, aceto-acetic anilide, 1- (N- ethylamino) -3-hydroxy-4-methyl-benzene. Mixtures of the individual components of the respective groups with one another can also be used «

These components of the photosensitive mixture, mentioned for example and located on at least one side of the support, may contain additives . These additions are to be divided into two groups here.

1 · Solo additives which, for example , serve all anti-yellowing agents, &! ■ wetting agents or as stabilizers, ie additives which influence the diazo and azo components in the specified, desired sense before using the paper, in order to thereby improve their light sensitivity and coupling · properties and their appearance even after prolonged storage

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to be retained as completely as possible. Additions of this type Bind BB, thiourea, glycerin, glyool, triethanolamine ale HOl-SaIe, saponin, zinc chloride or the sodium salt of naphthalene-1,3,6-trisulfonic acid. This group of additives can also contain agents that favorably influence the application and surface properties of the mixture with regard to its processing. These are thickening and smoothing agents, such as gelatin,

(Ά)
TylOB · t carboxymethyl cellulose or polyvinyl acetate suspensions.

2. Of course, single additives can also be added in small amounts, which are exposed to heat when used

tin create a neutral or alkaline environment. In terms of the selection of compounds, additives of this type are the same as those mentioned above for the substances which, in the amount of the carrier, come into question for the type of environment producing the above-mentioned environment.

In many cases it has turned out to be all two-dimensional, the contact, “as if he; To reduce the more sensitive preparation and the lubricant camouflaging incorporated into the paplerma, which has no effect in the noisy alkali, by finely cutting the liojrteejiindllolie diaeo connection

precipitates, indeä one solution of the

$ lM # T ** t ** «« ng in tin · Sueptneion of

and dl · Di aa ο connection afterwards with

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Polyvinylphosphonic acid precipitates and, as described, before treated papers coated with this suspension «,

A two-component diasotype copy material according to the invention which has been prepared in this way and can be developed by heat can be used in the known copying processes. For example, to produce a copy, the copy material is exposed to the original to be reproduced bö ± ^^ »^ §sd in · Eontakt IR source under an XR-absorbing]? Aj & ier or another material _t K ₈ B * a black colored Perlonsleö or an IE-absorbing film that is heat-resistant up to 210 ° C. ' The treatment between two heated rolls by pressing or by passing a hot air stream over them results in good eats and wraps. decharf® £ © p ± ö with Ausesseichaster Beökkraft der B ± ldstell®a _e ; . . "." .- "

Tati äer'Manufacture d @ g'erf ± adung @ g®mäsEen _st there. ■ "Heat developable material, siefe .. feeeoistlioh © ■ Advantage _{f in} front of all aaduroht that d ± e \ Beaohio & tuäg _: on 'the ... Vordörseit® me & ub άβτ? LiohtemsifindliofeeB 5Üsöli« Hf to be confirmed alone. © !! brauoiite Dadturoh becomes the permanent © Söni®kt

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between activating, neutral and alkaline environments generating substances and the photosensitive mixture avoided. The consequence of this is a very good storage capacity of the copy material.

Even if a small amount of activating agent is added Substance for the light-sensitive mixture results in significant advantages over the prior art, ^ a this addition can only be kept very small «, The Coating itself can be done in a single operation.

The mi-b produced from the material according to the invention Copies are characterized by great sharpness. Also at ! rager shows that the finished copies have been stored for a longer period of time no influence, so that the legibility and contrast of the copies do not change.

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Example ii

A base paper suitable, for example, for the diazo type, is impregnated on the paper machine by means of a size press within the dryer section with an aqueous solution of the following composition
10 parts by weight of urea

1.53 "zinc chloride

0.66 "citric acid 91 ^M - water

The material is then coated on one side with a 4 # aqueous solution of vinylphosphonic acid, the paper is dried and the same side is coated with a 1.2 # aqueous solution of the from Waoker Chemie Munich under the name "Building protection agent BS 10 ^w in den Commercially available sodium salt of polymethylcitic acid · The paper web is dried and then coated on the same side with an aqueous solution of the following composition

3.2 parts by weight of trichloroacetic acid

Tartaric acid

2,3-Dihydroxynaphthalene-6-sulfoic acid (Na salt)

Naphthalene-1,3,6-trisulfonic acid (Na-Salz)

4-dimethylamino-benzenediazonium chloride

Zinc chloride

urea

gelatin

Saponin

water

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The copy material produced eo delivers after exposure under an original and after development in In contact with heated rollers, high-contrast blue-colored copies and can be stored excellently even under humid, climatic conditions.

21

Ha paper suitable for the diazotype is made at the make cheese press of the paper machine with the following specified solution impregnated 15 partial urea 2 * zinc chloride 1 * citric acid 88 * water

The material produced is one-sided with the following Solution besohiohtsti

Qswioötetsile trionloroacetic acid

O ₉ S 4 »0 7.0 4» O

O.Of

fine acid

Thiourite

Iaphthalene-1,3,6-triaulfonic acid (Ha-BaIz) i _f > -dihydroxynaphthalene-6-sulfo8 acid (Na-SaIs) Si-carbon

H-diethylamino-benzene diaonium chloride oelatin

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The copy material produced in this way delivers after exposure under an original and after developing in the heat, high-contrast blue-colored copies of good ones Shelf life *

Example 5 8

A suitable base paper as described in Example 1 is on the infeed or offset press of the paper machine impregnated with the solution specified below!

30 parts by weight of müohsäureaiaid

10 ⁿ pyruvic acid "

The ao preserved © material is included with. the following solution bseoisioiitett "." 'Q-ewiohtstaile ! Srichloro acetic acid

4fO * - 2

4-sO ; ⁿ "- S urea .. ■. ■

7jÖ - ⁿ ■ - | lapli * helin-i »3 _f 6 - triBuif0B-ättr * (Ha-SaIs)

4to »■

yy
diAaoni.iaa.-ohla.rid

0.04 ^ir

90 «

M & xi. ■ © rhäit b @ i; .i »g ': - Warmth # ntwi.öHün'g ^- © ine blue-colored ^; Copy*"

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Example 4t

A base paper as described in Example 1 is used on the The size press of the paper machine is impregnated with the solution given below

10 parts by weight urea

1.35 "zinc chloride

0.66 ⁿ citric acid
91 "water

The material produced in this way is coated on one side with an aqueous solution of 7 | 5 $> polyvinylphosphonic acid, the paper is dried and the same side is coated with a 5% aqueous solution of the building protection ^{agent BS from the company Wacker Chemie Munich under the name of '1 BS} 10 ¹¹ marketed sodium salt of polymeric silicic acid. The paper web is dried and then coated on the same side with an aqueous solution of the following composition: 2.0 parts by weight trichloroacetic acid 0.2 ^M tartaric acid

7,0 »Iiaphthalln-1,3,6-trisulfonic acid (Na-Saljs) 4 »0" thiourea

4.0 "2,3-Dihydroxynaphthalene-6-sulfonic acid (Iia-Sal2) 10.0 ^rt Milohic acid amide

^0.5N zinc chloride

2.4 ^w 4-N-ethyl-K'-hydroxyethylaminobenaol diazonium chloride

0.09 ^w gelatin
^Λ β, σ4 "saponin
«WasseS g ^ ^ _Q ^ ^ _{f Q} ^ ORIGINAL INSPECTED

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After exposure to heat, a dark blue copy is obtained. The copying material has excellent shelf life.

Example 5t

A base paper as described in Example 1 is made on the infeed or offset press of the paper machine with the im The solution described below impregnates 15 parts by weight of urea 2 "'zinc chloride

1 ^w citric acid

88 ^{M of} water

The bo obtained material is one-sided with the following Solution coated

2.0 parts by weight of trichloroacetic acid 0.2 ^H tartaric acid 4 | 0 ⁿ 2,3-dihydroxynaphthalene-6-sulfoic acid (Ha-8alB) 7 | 0 »Haphthalene-l, 3,6-triulfonic acid (Na-BaIi)

4.0 ^w thiourea 10.0 ^tt tartaric acid diamide 0.5 "zinc chloride

2.4 "4-N-ethyl-N-hydroxyethylaminobeol diazonium chloride

0.09 ^M gelatin 0.04 ^N saponin ^N water

When the heat develops, you get a "very good", sharp-edged blue copy of the original.

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41

Example 6t

Am as described in example 1 base paper is at the Runner or offset press of the paper machine with the following specified solution impregnated

15 parts by weight of urea 3 ⁿ triohloroacetic acid 85 "Waeeer

The material obtained in this way is then coated on one side with a 5% aqueous solution of a polyamide-L-epoxy * ·.

harsee, which is sold by Bayer Leverkusen under the

(R) Vaaen Nadavin ■ 'is put on the market. After this Drying is carried out with a solution of the following additives

1.0 part by weight iriohloroacetic acid 0.2 "tartaric acid 4 »0" 2,3-dihydroxynaphthalene-6-sulfonic acid (Na salt; _Q 4, p, f _; thiourea l $ - ~ * _t . * t '' · · Haphthalene-1,3,6-trisulfonic acid (sodium salt)

2.5 · urea 0.5 "tin carbide 2,4 * DiBBthylamino-benzenediazonium chloride 0.09 "oelatin

0 * 04 ^N 8aponin 80 ν Walser

VAOh des BeIoat en you get a very contrasting color in the warmth, the blueprint of the original. _v

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Example 7i

A base paper as described in Example 1 is made on the * wet press of the paper machine with the one specified below Solution impregnated!

15 parts by weight of urea
2 ■ · zinc chloride

1 "citric acid

88 «Water

The material thus prepared is coated on one side with an aqueous solution of 3 $> of under the name "building protection BS 10" equal by Wacker Chemie GmbH Munich in trade brought Polyiaethylkieselsäurenatriumsalzes and 1 # sodium alginate, "After drying, can be spread on the Side of the paper following solution)

1.5 parts by weight of tartaric acid

4.0 "2,3-dihydroxynaphthalene-6-sulfonic acid

(Na-SaIz)

4.0 "thiourea

4.0 "Naphthalene- _{1,3 f} 6-trisulf08 acid (Na salt) 2.4" 4-Dimethylaminobenzenediazonium chloride 0.09 "Gelatin

0.04 "saponin

5.0 "urea
80 "water

After exposure you get a good dark blue copy of the original

* enter

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Example 8ι

A base paper as described in Example 1 is made on the paper machine by means of a size press within the The dryer section is impregnated with an aqueous solution of the following composition

1O ₉ O parts by weight of urea

8.5 ⁿ glycerol urea resin prepared

by melting them together and heating them to 120 ° C for one hour Share urea and glycerin

82 ⁿ water

The material thus obtained becomes one-sided with the following Solution coated!

0.2 parts by weight of tartaric acid

4.0 * 2,3-dihydroxynaphthalene-6-sulfofic acid

(Na-SaIz)

4.0 « Thiourea 4.0 " Naphthalene-1,3-6-trisulfonic acid (Na-SaIe) 1.7 " 4-dimethylamino-benzenediazonium chloride 5.0 " Saponin 0.09 * Gelatin 85 " lasser

After exposure, the heat build-up gives a blue copy of the original.

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Example 9t

A transparent base paper suitable for the diazotype, that in its composition and in its retention of fillers and sizing agents is made up of these requirements on the paper machine within the dryer section by means of an air brush application Facility impregnated with the following solution ι

10 parts by weight of urea

1.33 "zinc chloride

0.66 "citric acid
91 "water

The material obtained in this way is coated on one side with a solution of 7.5 5 * methoxymethylperlon in 70 tiger Methanol and after drying applies the following solution to the same side of the paper: I.

3.2 parts by weight of trichloroacetic acid

0.2 η tartaric acid 4.0 dd 2,3-dihydroxynaphthalene-6-sulfoic acid (Ha-SaIe) 8099C 4.0
7.0 dd
dd Thiourea
Naphthalene-1,3,6-trisulfonic acid (Na-Sal «) 10.0 ti urea ο
-J 2.0 η 4-dimethylamino-benzenediazonium chloride 1.5 dd Zinc chloride 0.09 dd gelatin 0.04 H Saponin 75 dd What he

After exposure to heat, a is obtained blue copy of the original «,

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\ SIn bohpapier is made on the paper machine at the glue press treated with the following solution!

15 öewiohteteile urea 2 "c zinc chloride 1 ^N citric acid

Θ8 "water

The material obtained is coated with an aqueous suspension which is prepared as follows Hau suspended in 70 parts by volume of a 1.5 # strength aqueous Ittaung de »sodium salt of a polymethylkillic acid, which ▼ on the firaa laoker Chemie GmbH Munich under the Beseichxrong "building protection agent BS 10" in the trade is, 4 parts by weight of a finely divided silica with

a Koragröasen division, which is mainly between 1 and 10 M and adds 20 parts by volume of a 30 CNwriolitf-Jligen suspension of a dye-works Hoechst AQ under the name ^^ DMO 2 ton. In the introduced polyrinylaoetat-Misohpolymerisate ·· The so inherited suspension is mixed with vigorous stirring all- ■!, t 10 parts by volume of a 10% aqueous Mnokerer vinylphosphonic acid ·, and the .e for one hour vigorously stirred ·

r »e« oJÜ.oatete fapier will open after drying te old solution of the following

KALLE AKTIENGESELLSCHAFT Unitr «Ztlchtn Tag sheet

K 1460 % £ SP-DroR-ew ■ 11.20.64 36 "

0.2 parts by weight trichloroacetic acid

Tartaric acid

Naphthalene ^, 5,6-trisulfonic acid (Na salt) thiourea

2,3-dihydroxynaphthalene-6-sulfonic acid (Na salt; triethanolamine as HCl salt urea
Zinc chloride
gelatin
Saponin

4-Dlmethyla2iino-benzenediazonium chloride water

The Papiex * produced in this way is characterized by special features good shelf life and high contrast. - ^ s can after the exposure under a transparent original by heating to 160 to 170 ° C. You get a good, blue-colored, positive copy of the original »

0.2 Il 7.0 Il 4.0 Il 4.0 Il 4.0 It 5.0 It 0.5 It 0.09 It 0.04 ft 2.0 Il 90 dd

809902/0715

Claims (2)

1 · Heat developable two-component diazo printing material, consisting of a substrate that can be provided with a precoat and at least on one side a layer of a light-sensitive Mixture of a diazo component, an azo component and optionally additives, characterized in that distributed throughout the carrier material is contained at least one compound, 'which when exposed to heat by the Hindu carrier in the photosensitive mixture creates a neutral or alkaline environment, and this compound can also contain additives. 2. A process for the production of the two-component diazotype copying material according to Claim 1 by coating a carrier material with a photosensitive mixture a diazo and an azo component, optionally with additives, with at least one Vorstrioh beforehand This carrier material can be applied, because it is characterized by the carrier material during its 809902/0715 KALU AKTINGESELLSCHAFT BP-Br.fi- # g 20.2.64 a· »Tt lueüetn, lugtsittst throw, Ή · with warmth effect in its * lioht "! Kpflntliok" A Solekt tin ntutrtlei cfltr Kilitu • AD 809902/0715