DD276416A3 - Method for producing color proof images - Google Patents

Abstract

The invention relates to a method for the production of color proofs that can be used for four-color offset printing. According to the invention, a multilayer diazotype material is exposed via black / white color separation templates with filtered light, which is specifically tuned to the three light-sensitive layers, in three spectral ranges and developed in the manner known for diazotype materials. The multilayer diazotype material is characterized in that it comprises three light-sensitive layers containing one or more diazonium salts and color couplers arranged on a support, of which two light-sensitive layers approach their absorption maxima up to a distance of 20 nm and the third light-sensitive layer a minimum distance in their absorption maximum of 60 nm to the absorption maxima of the other two photosensitive layers. The absorption behavior of the two light-sensitive layers having a minimum distance of the absorption maxima of 20 nm may only overlap in the region of one edge of the absorption spectra of the layers. The multilayer diazotype material underlying this process has for the first time succeeded in using a compact multi-layer diazo system on a carrier for color proof purposes.

Description

For this 1 page drawing

Field of application of the invention

The term refers to a process for producing color proof images.

Characteristic of the known state of the art

The production of a colored image after 4-color offset printing is extremely expensive. From any template (slide-positive, color image, color-nagative image), Oberscanner creates four color separations in rasterized form on phototechnical transparent black / white materials by means of targeted spectral range separation of visible light.

The blue-green parts of the picture are separated with red light (Cyan-Fatbausiug), with green light the purple parts of the picture (magenta color separation), with blue light the yellow parts of the picture (yellow Ferbauszug) and with white light the black-abstract. Dieso four color separations then serve as a template for the creation of printing plates, which then, in different order successively and coated with the appropriate inks, serve yellow, magenta, cyan, black) as Druckmaierial.

In order to detect possible errors on the four color separations, a test print is produced on a mostly small offset printing press. An evaluation of these proofs (proof) then leads either to pressure release, if no errors occurred, or to necessary corrections. In many cases, a proof is not sufficient, and in order to reduce their number, so-called color proof methods have been developed, starting in the early seventies. One of the first reviews was published by K. Spangler in Graphics Arts Progress 8/71 under the title "Color proofing Systems: Uses end Capabilities *.

Over the past 15 years, many proofing processes have been offered on the market. According to K. SchlSpfer (in UGRA publications 1/1986, pp. 3-12), only a few methods have achieved breakthrough, those based on the principle of photopolymerization and those producing the image electrophotographically by toning. These methods clock in after the step of creating the four black-and-white color separations, but fundamentally differ in principle in producing the color images to be compared with the original one, and then decide to what extent the four color separations meet the requirements.

This results in the possibility of counteracting repeated production of printing dies, a very complex and expensive method step.

K.Schläpfer describes in the UGRA-Mitteilungen 3/1980, pp. 76-84 the principles of two test methods, both of which are attributable to the phylum-based systems. Polymer layers are known, provided with a protective film, both positive and negative working. This polymer is coated in the laminator on the substrate and exposed directly through the first black and white color separation with a UV lamp.

By the action of light, the stickiness changes, with the result that the first color powder (toner), which is subsequently applied, in the case of the use of positive material only sticks to the unexposed areas. The stickiness has been lost on the exposed parts. Subsequently, the next photosensitive polymer layer is laminated onto this monochrome image and the processes exposure u. Toners repeat until all four colors are stacked. The great advantage of this method, to allow an almost identical color impression between the printing and .Prüffarben stands against a complex and complicated processing. Another method is electrophotographic toning. The imagewise toner is not guaranteed by a different stickiness of the documents, but by a four times in series connected electrostatic charge and subsequent toning with yellow, magenta, cyan and black pigments. Here is the technical expense even higher estimate.

There are known for Andrücker etching techniques that do not use any special equipment. Nöüg are a copy frame and a hand roller. The materials are photopolymeric diazo resins, each

eeparat are pigmented with the four dyes yellow, magenta, cyan and black. First, the one film (PVC) with the

Color pigment containing Diazcschicht mounted on a support material (paper, foil, cardboard) and with the hand roller

pressed. The exposure is done with UV light through the corresponding negative.

After the PVC FoIIe has been peeled off, the unexposed areas with Propano! replaced. This process is then repeated with the following three pigmented oiazo resin layers. Disadvantages are on the one hand, the negative working of the material, which usually entails that the pressure side-reversed Is, on the other hand, the wet processing steps. Among the diazotype materials, only monochrome diazo films were used for the color proof application. The

monochrome copies of the template samples are superimposed after development by means of a passer system (Lay

Off systems), described, for. By D. Reichel in Chimia, vol. 29, p. 482 of 1975. Main disadvantages are the inaccurate ones Passersysterne and by the frequent refraction of light (four about 75 to lOOpm films on top of each other) to record Dissimilarity for later printing. Nevertheless, in order to dispense with the simple principle of the diazotype for multicolor copying ancestors, no Mehrschichtdiazosysteme developed as described in DD-WP 251634. These are constructed, on the one hand as equidensitometry material, on the other hand as a copy material of multicolored originals. In the former systems, in each photosensitive layer, diazonium salts having the same or very similar Absorptionsparamtitern used. Different optical densities of the black and white master are nuf the Diszomehrschichtmaterial reproduced by different color impressions. The copying materials are constructed so that different colors of the original through different, in their Absorption behavior clearly differing diazonium salts (minimum difference 80 nm), reproduced in color

become. These materials are only used in color proof systems, even though the di-ammonium salt used for the copying of the cyan image dyes would produce virtually fog-free photolysis products. Since this is not realized, such Mehrschichtdiazomaterialien can be used only as transmitted light films.

Object of the invention The aim of the invention is to produce color proofs faster and with less effort. Explanation of the essence of the invention The invention is based on the object, a Andruck Ersatzverfnhren door for the 4-color offset printing on the basis of To create diazotype material. According to the invention, the object is achieved by, for the production of color proof images (color proof), a three on a support

superimposed on one another, one or more diazonium salts ur. <d color coupler containing light-sensitive layers multilayer Diazotypiematerfal, in which approach two light-sensitive layers in their absorption maxima to 20 nm and the absorption spectra of these layers overlap only in the region of one flank and a third light-sensitive layer in their absorption maximum a M'indestabstand of 60nm to the other photosensitive

Has exposed layers over black and white color separation templates with filtered light in the three spectral ranges and in

which is developed for b.'azotype materials, is used.

It is found overreaching that by means of targeted exposure with filtered light by black and white templates a Color separation can be achieved. According to the invention, the absorption maxima of the photosensitive diazonium salts in the upper layer are in the region of 350

to 400nm, in the middle class in the Berel.h from 390 to 460nm and in the Untersrhicht in the area upper 46Cnm. The

Absorption maxima of the upper and middle classes must have a minimum score of 20nm. There must be no overlap

the absorption curves occur in the areas of the rising edge of the upper layer and the descending edge of the middle layer.

Examples of diazonium salts in the Obei layer are z. B.

NO,

-OR

NHCOR

Particularly suitable for diazonium salts in the middle layer are r. B.

R R

RO

, OR

N,

Η-,

NHCOCH,

Particularly suitable for diazonium salts in the underlayer are e.g. + j.

RO '

NO

RO ¹ 12 .N ^ ^^ * - 0R

R

R = ALK

R ¹

Fi

R ^A ALK

R "PH

R OALK

R OALK

CN

As a coupler, all known can be used which produce with the diazonium salts yellow, purple and blue-green image impressions. For the production of yellow image dyes, for example, suitable cyanoacetic aniline and - mine, acetoacetanilines and -subsylamides, substituted phenols and resorcinol derivatives.

For the production of purple image dyes are Resocyisäurederivate. 2-nephthols, triazolium salts and naphthol AS couplers suitable. Blue-green image dyes are obtained, for example, with some naphthol AS couplers or metal-II salt complexed heterocyclic phenolic couplers. Suitable stabilizers are organically readily soluble, low-volatility acids, such as, for example, 4-toluenesulfonic acid, suosilicylsulfonic acid, citric acid, tartaric acid and the like

 The preparation of the multi-layered diazo material can be realized as follows:

On the basis of film, paper, glass or metal, a polymer matrix which contains a green-sensitive diazonium salt, one or more coupling agents and a stabilizer acid is applied as the first light-sensitive layer. The binders used are polymers insoluble in ethanol, preferably postchlorinated PVC dissolved in a mixture of methylene chloride / ethylene chloride 1: 1. This diazo layer is either placed on the substrate with the doctor blade or machine-shed so that the layer thickness of the single layer is 3-4pm. After drying of the lower layer is on the second polymer solution,. dio a blue-sensitive diazonium salt, coupler and acid containing, shed (middle layer), üieo is in turn possible by hand or by machine. In order to avoid dissolution of the lower layer and thus mixing of the components, the second binder used is an alcohol-soluble polymer. Geoignet are, for example, polyvinyl acetate, polyvinyl butyral and

Change polyvinyl acetate as well as modified copolymers of MSA with styrene and propylene. The third photosensitive layer (top layer) can not be directly applied to the present 2-layer dressing, as in the nonpolar

Solvent, which would be necessary to avoid a dissolution of the middle layer necessary for the diazotype Components are not sufficiently soluble. For this reason, a thin intermediate layer is shed. Diete interlayer needs the two color-bearing Separate layers so that it can not lead to a diffusion of the components and thus to a color falsification. Preferably, a polystyrene layer of carbon tetrachloride is applied. A layer thickness of 0.1 μ is included

sufficient.

Thereupon, the upper layer can be one or more with a Diazoniumealz that is sensitive in the near UV rich Pour couplers and the appropriate stabilizer acid. The binder used corresponds to that of the middle layer,

but may also differ from this.

The solvent must be such as not to dissolve the thin polystyrene interlayer. The Gesamtschichtdicico the ^ layer material should entrust about 10-12 μπι. Between the individual Begießschritten is on one

sufficient drying, if necessary with the supply of heat, to shoot.

The exposure process according to the invention takes place in the following way: With the aid of the black and white Furbauszugssatzes available in multi-color printing, bol one of the four color separations

the image information for e ^! The three basic colors for the subtractive color mixture yellow, magenta, and cyan as well as for black are printed on date-colored diazo type material consisting of three light-sensitive layers, a colored raster image in the contact method. by means of a special light source.

This is done in succession for each partial color separated by the corresponding color separation of the three primary colors GuIb, Magenta and CyB ₁ I on the designated single layer within the composite layer. The color separation for black is

each time on the appropriate base color excerpt launched. A "sufficient flatness and exact match between diazotype material and color separations must be ensured. Only three separate exposure steps are necessary to transfer all of the image information, whereupon a primary color excerpt and a black extract are displayed on the corresponding single layer within the composite.

Thus, only the designated layer exposed with the corresponding primary color excerpt and Schwarziuszug

is, a selective exposure of the individual photosensitive layers is performed. The selective sealing of the three partially overlapping oiazotype layers with respect to the spectral sensitivity (see Figure 1) is performed using suitable optical filter glasses in three different mirror areas.

All three shifts work in the positive direction. The unexposed Sieuen (Rssterpunkte) take after the development of the Diazotype-mialiale participating in the picture construction. Diazonium salts and color couplers of Mehrschichtdiazotypiemateri / il «are chosen so that in each case one layer to a

the primary colors yellow, magenta or cyan. First, the exposure of the ultraviolet-sensitive topsheet takes place

X _n ,,, "350 to 400 nm with the corresponding Grundfarbenausz jg and black (template) via a only in the near UV range

permeable glass filter. The filter is chosen so that the exposure of the top layer can only occur in the region of the rising edge of the spectral absorption curve of the ultraviolet-sensitive diazonium salt, d. H. in the spectral range in which "I di (spectral absorptions of the ultraviolet-sensitive and the blue-sensitive diazonium salts * do not yet or only very little overlap.

Dio exposure of the blue-sensitive middle layer K * u = 390 to 450 nm with the template via a filter combination the

absorbs the radiation region which is hypeochromic or bathochromic with respect to the spectral region of the blue light.

The filter combination should be chosen so that the exposure of the blue - sensitive layer in the area of the trailing edge of the

Spectral absorption curve of the blue-sensitive diazonium salt is made, so that in this area the spectral absorption curves of the ultraviolet-sensitive diazonium salts and the blue-sensitive diazonium salt or those of the blue-sensitive and the green-sensitive diazonium salt overlap only minimally. As last one

Exposure step follows the exposure of the green-sensitive sub-layer X _n ^ _n > 460 nm of the multilayer material with the Template via a filter that eirr spectral transmittance in the entire bathochromic range with respect to the blue light or

only in the green spectral range, d. H. in the spectral range of the absorption maximum and the descending flank of the

Absorption curve of the green-sensitive diazonium salt. The exposure times of the individual layers are to be chosen so that a complete exposure of the ι asterpunktfreien Image positions done. Otherwise there will be a concealment of the picture. If necessary, the exposure order may also be

be reversed. The light source may be high-pressure discharge lamps based on Qiiecksilberbasis or

Mercury push-pull lamps are used. After exposure of all three layers with the appropriate Color separations a latent image on the diazotype material is recognizable. The development of the latent diazo image occurs as in the conventional diazotype in a humid ammonia atmosphere

or under ammonia pressure. The unexposed areas of the three photosensitive layers of the

Mehrschichtdiazotypiematerials according to the diazonium salts and color coupler used to each of the three Basic colors cyan, magenta and yellow. With the process underlying Mehrschichtdiazotvpiematerial it is the first time succeeded, a compact on a Carrier befindliches color-intensive multi-layer diazo system for color proof purposes use. The labor-intensive processing steps necessary in other known color proof applications, wio z. B. laminating the

'Photosensitive layers on a support material or the toning of the exposed layers with color pigments, deleted. The very simple development process typical of diazo materials can also be used. extensive

Device systems for processing eliminated. Due to these advantages, it is possible to produce a complete color proof image within a very short time. Ausführungsbelsplele example 1

On an area of 1 rr. ^: Polyethylene-coated paper is applied with a polymer solution having the following composition.

Lower layer: 3g PVC (postchlorinated)

27 g of a mixture of ethylene chloride / methylene chloride to (ileichen parts

260 mg of 2-morpholino-3, e-diethoxybenzendiazonium-amide.'3f!

135 mg 2-hydroxy-3-naphthoic acid-2'-anisidide

66 mg of 2-hydroxy-6-methoxy-3-naphthoic anilide

45 mg of p-toluenesulfonic acid

After drying, an undercoat having a layer thickness of about 3-4 μm is obtained. Onto this material is applied another photosensitive polymer solution, the middle layer, having the following composition;

Middle layer: 6 g polyvinyl butyral

14 g of methanol

165 mg of 3-methoxy-4-morpholinobenzendiazonium tetrafluoroborate

165 mg acetoacetanilide

54 mg of p-toluenesulfonic acid

The layer is optionally dried at a temperature of up to 50 ^° C. The total layer thickness is about 6-8 μm. Then it's about 0.1-0.5pm starl? Intermediate layer applied, which consists of a 2% solution of polystyrene in carbon tetrachloride. The interlayer is dried and applied as the third light-sensitive layer (upper layer), a polymer solution of the following composition:

Upper Class: ec polyvinyl butyral 14g methanol 120 mg p-Diethylaminobenzendiazoniumtetrafluoroborat 250 mg Ni'-tort.-butoxyacetat 250 mg 3-Berualhydrazino-4,5-dimethyl-1,2,4-triazole 100mg p-toluenesulfonic acid

After drying, which can optionally take place at a temperature of up to 50 ° C., about 1 m of ^{J is obtained} Material with a total thickness of about 10-12 pm. This can be exposed imagewise as follows. The light source used is a high pressure mercury lamp HBO500 (VEB NARVA! Diazotype material and Forbauszugsvoriagen can through two plane-parallel about 3mm thick glass or plastic plates before

and behind the contact package of color separation templates and diazotype material can be achieved (Mintostransmissionnberelch the VorcJerplatte 350nm to 600nm). The superimposing of the templates with the dicotyped material is ensured by way of β η in the attached pin system.

With an original size of 120mm χ 150mm, a distance of about 300mm between the light source and Lighting level to illuminate the entire format level sufficiently evenly. The following three separately « Exposure steps refer to 300min distance between light source and level.

1. Exposure of the upper layer via the glass filter UG11, code no. 602 (2 mm thickness), manufacturer all r in the examples listed glass filter is the VEB Car! Zeiss JENA, with cyan color separation and overlying black · color separation. Exposure time about 2 to 3min.

2. _ Exposure of the middle layer Above the glass filter combination BG 3 / GG15, code no. 622/742 (/ β 2 mm thickness), with the GeIb-Fa'rbauszug and overlying black color separation.

Exposure time about 1 to 2min.

3. Exposure of the undercoat over glass filter OG4, ccde # 751 (2mm thickness), with the magenta color separation and overlying black color separation. Exposure time about 1 to 2min.

Finally, the development of the exposed diazotypiatorials with a moist ammonia atmosphere takes place. After complete development, a colorful raster image, corresponding to the four-color print, becomes visible. The cyan dots are formed on the areas covered by the cyan color separation at exposure step 1 by azoki coupling of the undestroyed diazonium salt with the color coupler in the upper layer. Thus, a cyan halftone partial image is formed in the top layer of the diaiotype material. The layers of the upper class struck by the light appear colorless after development due to the destroyed diazonium salt and lack of color coupling. Analogously, a yellow halftone subimage is formed in the middle layer by the staking step 2, and a magenta halftip image is formed in the lower layer by exposure step 3. Black is produced by copying the black color separation onto each individual layer (exposure steps 1, 2, 3) as a stractive color mixture of yellow, magenta and cyan.

REFERENCE 2

On a bogie machine, which can be equipped with both scraper and scouring casters, will open

subsequently made a 4-layer material.

On PE beschichietes paper is applied with the Abstreichgießer the first photosensitive polymer solution, so that the Wet towel thickness is 50 to 100pm. The polymer solution has the following composition: Undercoat: 4CCm! next grade FvC, 10%: g in methylene chloride / methylene chloride

3.5 g of 2-morpholino-3, e-diethoxybenzendiazonium tetrafluoroborate

1.3 π 2-hydroxy-3-naphthoic acid-2'-ansidide

0.91) 2 hydroxy-e-methoxy-S-naphthoic acid -toluidide

0.6 g of p-toluenesulfonic acid

In the machine passage, the paper web is dried, optionally at temperatures up to 80 ° C. Thereafter, the second photosensitive polymer solution is applied with the Abstreichgießer (also Naßschkhtdicke

up to 100 pm), the following components are available:

Middle layer: 400 ml polyvinyl butyral 19% in CH ₁ OH

2.5 g of 3-methoxy-4-pyrrolidinobenzendiazon ^: umtetrafluoroborat 4 g of 3-benzalhydr <Jzino-4,5-dimethyl-1,2,4-triazole 4 ρ Ni ^H -isobutoxyacetat

1.6 g sulfosalicylic acid

After drying of the coating, which can be carried out again at a higher temperature, the intermediate layer is applied, Ec here eich is a 2% polystyrene solution in tetra. Since the dry layer thickness, which is only 0.1 μ to prevent the diffusion (.br components), the intermediate layer is rinsed in. After drying, the third and the Ute photosensitive layer is applied again with the Abstreichgießer t: s is the following polymer solution (wet film thickness 50 to 100 μm):

Overcoat: 400 ml of 19% polyvinyl butyral in CH ₁ OH

1.1 g of p-diethylimine-benzimidazole salt

1.1 g of acotoacetbenzylamide

0.7 g of p-toluenesulfonic acid

You get about 12.5m 'of a 3-color material. The total dry film thickness is about 9 to 12 μσι. The material will be like

follows illuminated:

The exposure apparatus and the aids used correspond to those in the example The following three separate exposure steps refer to 300mm distance between light source and exposure plane:

1. Exposure of the upper layer via the glass filter UG11, Codo-Nr. 602 (2-mm thickness), with yellow color separation and overlying black color separation. Exposure time about 2 to 3min.

2. Exposure of the medium layer over the glazed filter combination BG3 / GG15, Code No. 622/742 (2 mm thickness each) with the cyan color extraction and overlying black color extraction.

Exposure time about 1 to 2 min.

3. Exposure of the lower layer via the glass filter combination BG 23 / GG14, code no. 654/746 (2 mm thickness), with the Mcgenta color separation and overlying black color extraction, exposure time about 1 to 2 min.

This results in the development of a Bile * according to Example 1 with the difference that is now in the upper layer, the yellow halftone subimage image and in the middle layer, the cyan halftone partial image. The magenta raster image is formed by the lower layer.

Example 3 On borytiertes paper a 4-layer dressing <em Example 1 is poured. The following polymer solutions come to

Commitment:

Underclass: lOVoige PVC solution in Chloi benzene Polvinvlbutvrallösuna in ethanol 0.55 g 2-morpholino-3,6-diethoxybenzendiazoniumtetrafluo; oborat 0.05 g resorcinol 0.35 g Benzoylessigsäureanilid 0.10 g p-toluenesulfonic acid Middle layer: 20% Polyvinyl acetate solution in ethanol 0.30 g 3-methoxy-4-pyrrolidino-benzendiazoniumtettaffuoroborat 0.10g 2-naphthol 0.25 g 1-benzyl-4-Benz "larrino-1,2,4-triazolium chloride 0.05 g p-Toluensulfonsäuro Intermediate layer: according to Example 1 Upper Class: 20% iae

0.40 g of 4-diethylaminobenzendiazonium hex3-chlorozincate

0.25 g BenzaldohyCpyridylhydrazon

0.40 g nickel'-butoxyacetate

0.25 g of p-toluene sulphonic acid

This gives about 0.6m 'aina's 3-color material. This is exposed as follows: The exposure apparatus and the aids used correspond to those in the example The following three separate exposure steps relate to a distance of 300mm between the light source and the exposure plane:

1. Exposure of the upper layer Above the glass filter UG1. Code No.605 (1 mm thickness), with the cyan color separation and overhanging ScnWöfi-rär bäuszüg. Bsiichtür.giieit stwa 2 to Srnin.

2. Exposure of the middle layer via the glass filter combination BG 3 / GG 15, code no. 622/742 (each 2 mm thick), with the Magenta Forbauszug and black color separation.

Exposure time about 1 to 2 mm.

3. Exposure of the lower layer over the glass filter OG 4, code No.751 (2 mm thickness) with the yellow fiber extraction. Exposure time about 1 to 2 min. The development results in an image according to Example 1, with the difference that the magenta halftimber image is now in the middle layer and the yellow halftone subimage image is in the lower layer. The cyan halftone partial image is formed by the upper layer.

Example 4 A multilayer material according to Example 1 is applied to polyethylene-coated paper. The individual layers contain the following components:

Lower layer: Ig after all. riörtes F ¹ VC 9g ethylene chloride 80 mg 2-morpholino-3 (l-diethoxybenzendiazoniumtotrafluoroborat 40 mg 2-hydroxy-3-naphthoic acid-2'-anisidide 20 mg 2-hydroxy-6-methoxy-3-naphthoic acid-2'-toluidide 10 mg Zitionensäure Middle class: 2g polyvinyl butyral 8g Bulanol 80 mg 2-pyrrolidino-4-mt3tho ^> cy-5-acylaminobenzendiazonium totrafluoroborate 70 mg Acutoacetbenzyhmid 20 mg Sulfosalicylsäuro Intermediate layer: 3% Polystyrene solution in Tetra Upper layer: 1.6 g St> ren-Maleinsäureeti.ylhalbester 8.5 g Ett anol 30 mg 2-methoxy-4-diethylaminobenzendiazoniumtetrafluoroborat 30 mg ? -Hydroxy-6-me? Hoxy-3-naphthoic acid-2'-toluidide 20 mg Suifosalicyisäuro

An area of about 100 cm 3 of a 3 color proof material is formed. This is checked as follows: The treatment apparatus and the aids used correspond to those in the example The following three separate exposure steps refer to a distance of 300 mm between the light source and the exposure plane:

\ . Exposure of the upper layer over the glass filter

UG 11, code no. 602 (2 'mm thickness), with the cyan color faux and dat over black color separation. Exposure time about 2 to 3min.

2. Exposure of the middle layer over the glass filter combination BG 25 / GG 15, code no. 643/742 (each 2 mm thick), with the yellow construction train and the black pull-out train lying across.

Exposure time about 1 to 2min.

3. Exposure of the underlayer over glass filter Oo 4, Code No.751 (2 mm thickness), with dom magenta color separation and black color separation overlying.

Exposure time about 1 to 2 min. It disregards a picture in accordance with Example 1 with dom cyan halftone subpicture in the upper layer, the Rasterertilbild in the middle layer and the Magenta-Rasterteilbild in the lower layer of the diazotype material.

Beloplcl 5

A multi-layer material suitable for color proof is prepared as follows: On polyethylene-coated paper

first tine underlayer applied by machine with the Abstreichgießer (see Example 2).

The polymer solution for the lower layer has the following composition: Undercoat: 500 ml of 10% F-celite solution in methylene chloride, methanol

4.3 g of 2-morph (ilino-3,6-diethoxybenzendiazonium tetrafluoroborate

2.25 g of 2-hydrox / 3-n8-phthoic acid 2'-anisidide

1.1 g of 2-hydroxy-methoxy-3-rtaphthoic acid-2'-toluidide

0.8 q p-toluic acid

Thereafter, an intermediate layer is applied, which is intended to prevent the diffusion of the components. The polymer solution for the intermediate layer consists of 1% polystyrene solution in tetra. The solution is applied with the Anspülgießer and has a layer thickness ofm 0.1 pm. After drying, the third layer is applied with the spread caster to this 2-coat dressing. The polymer solution has the following composition:

Middle layer: 500 ml of 19% polyvinyl butyral solution in methanol

1/7 g of 2,5-diethoxy-4-morpholinobenzendiazonium t6-trafluoroborane

1.5 g of 2-hydroxy-6-methoxy-3-naphthoic acid 2'-anisidide

1.0 g of p-toluenesulfonic acid

After drying, a further intermediate layer of 1% polystyrene solution in tetra is applied to the middle layer. This is done again with dom Anspülgießer. Then, after drying, the third photosensitive layer is potted with the Abstreichgießer. The polymer solution required for casting has the following composition:

Upper layer: 500 ml polyvinyl butyral 19% in methanol

1.4 g of 4-diethylaminobenzendiazonium tetrafluoroborate

1.4 g of acetoacetbenzylamide

0.9 g of p-toluenesulfonic acid

After drying the top layer, 10m ^{1 of} a color-proof material, consisting of 5 layers. This material will

exposed as follows:

The exposure apparatus u. the aids used correspond to those in Example 1. The following three separate exposure steps refer to 300mm distance between Liohiqusue and level of growth ·

1. Exposure of the upper layer over the glass filter UG. 11, code no. 602 {2 mm thickness), with yellow color separation and overlying black color separation.

Exposure time about 2 to 3min.

2. Exposure of the middle layer over the glass filter combination BG 25 / GG 15, Code No.643 / 742 (each 2mm thickness), with the cyan color separation and overlying black color separation.

Exposure time about 2 to 3min.

3. Exposure of the lower layer via the glass filter OG 4, code no. 751 (2 mm thickness), with the magenta color separation and overlying black color separation.

Exposure time about 1 to 2min.

The development results in an image according to Example 1 with the difference that jotzt in the upper layer, the yellow halftone subpicture and in the middle layer is the cyan Hasterteilerteilbild. The magenta residual part image is formed by the underlayer.

Example β

According to Example 1, a color-proof material of the following composition is prepared: Undercoat: 100 ml postchlorinated PVC in chlorobenzene

0,60 ς; 2-morpholino-3,6-diethoxybenzendiazoniumtetrafluoroborat

0.01 g resorcinol

0.40 g of benzoylossitol tetrahydrofuran

0.15 g of p-toluenesulfonic acid

Middle Layer: 100 ml of 15% styrene-maleic acid butylester in butanol

0.60 g of 3-methoxy-4-Pyr ^r olidino-benzendiazoniumtetrafluoroborat

1.0 g of 3-benzalhydrazino-4-amino-1,2,4-triazole

1.0 g of Ni "isopentoxyacelate

0.2 g sulfosalicylic acid

Interlayer: polystyrene 3% in tetra Upper layer: 100 ml of 16% styrene-maleic acid butylester in butanol

0 3g 2-methoxy-4-diethylaminobenzendiazonium tetraironate orate

0.3 g of 1-benzyl-4-benzalamino-1,2,4-triazolium chloride

0.1 g sulfosalicylic acid

The material is exposed as follows: The exposure apparatus and the aids used correspond to those in Example 1. The following three separate exposure steps refer to a distance of 300 mm between the light source and the exposure plane.

1. Upper layer exposure over the UGII glass filter, code # 602 (2mm thickness), with the magenta color separation and overlying black color separation.

Exposure time about 2 to 3min.

2. Exposure of the middle layer via the glass filter combination BG 3 / GG 15, code no. 622/742 (each 2 mm thick), with the cyan color separation and overlying black color separation.

Exposure time about 1 to 2min.

3. Exposure of the underlayer over the glass filter combination BG 23 / GG 14, Code No.654 / 746 (each 2 mm thickness), with the yellow color separation and overlying black color separation. Exposure time about 1 to 2min.

During development, an image is created in accordance with Example 1, whereby the three halftone partial images, in contrast to Example 1, are all in a different layer.

The magenta raster image is formed in the upper layer, the cyan raster subbed in the middle layer and the yellow raster subimage in the lower layer.

Example 7

According to Example 1, a color-proof material of the following composition is prepared:

Undercoat: 10 ml post-chlorinated PVC 10% in fviothylenchlorid / ethylene chloride 1: 1

60 mg 2-morpholino-3,6-diethoxy benzene diazonium tetrafluoroborate

20 mg dibenzoylmothane

10 mg of p-toluenesulfonic acid

Middle layer: 10ml polyvinyl acetate 15% in ethanol

30 mg of 2,5-oiethoxy-4-morpholinobenzendiazonium tetrafluoroborate

30 mg of 2-hydroxy-6-methoxy-3-naphthoic acid 2'-anisidide

5 mg of p-toluenesulfonic acid

Interlayer: 2% polystyrene solution in Tetra

Upper layer: 10 ml polyvinyl acetate 15% in ethanol

20 mg of 2-methoxy-4-diethylaminobenzobenzonium tetrafluoroborate

15 mg of 1-benzyl-4-benzalamino-1,2,4-triazolium bromide

5 mg of p-toluenesulfonic acid

5 test strips of a color-proof material are obtained, which is exposed as follows.

The exposure apparatus and the aids used are the same as in Example The following three separate exposure steps refer to 300 mm distance between light source and baffle plane.

1. Exposure of the topcoat over the glass filter UG 11, Code No.602 (2 mm thickness), with the magenta color separation and overlying black color separation.

Exposure time about 2 to 3min.

2. exposure of the middle layer üi. he the glass filter combination BG 3 / GA 40, code no. 622/741 (2 mm / 4 mm thickness), with cyan color separation and overlying black color separation.

Exposure time about 1 to 2min.

3. Exposure of the lower layer via the glass filter OG 4, code no. 751 (2 mm thickness), with the yellow color train and overlying black color separation.

Exposure Time \ to 2min.

During development, an image is formed in accordance with Example 1, with the three halftone partial images all being in a different layer than in Example 1.

In the upper layer, the magenta halftone subimage image forms, in the middle layer the cyan halftimber image and in the lower layer the

Yellow component halftone image. Example 8

According to Example 2, the following color-proof material is produced on a casting machine:

postchlorinated PVC 10 '& inMelliylenchlcrid / ethylene chloride

2-MorpholinO'3,6-diethoxybenzendiazoniumtetrafluoroborat

dibenzoylmethane

p-toluenesulfonic acid

Polyvinyl butyral 20% in ethanol

3-Benzalhydrazino-4,5-dimethyl-1,2,4-triazole

3-methoxy-4-pyrrolidino-benzendiazoniumtetrafluoroborat

Ni "tert-butoxyacetat

p-toluenesulfonic acid

Polyvinyl butyral 20% in ethanol

2-Methoxy-4-diethylamino-benzene diazonium tetrafluoroborate 1-benzyl-4-benzalamino-i, 2,4-triazolium bromide p-toluenesulfonic acid

Underclass: 11 • 8.5 g 11FL 2g Middle layer: 11 3.5 g 3.5 g 4g 2g interlayer : Polysi Upper Class: 11 2g 2g 0.5 g

About 25 to 30 μm of a color-proof material are obtained, which is exposed as follows: The exposure apparatus and the aids used correspond to those in Example The following three separate exposure steps refer to 300mm distance between light source and exposure plane:

1. Exposure of the top layer over the glass filter UG 11, Code No.602 (2 mm thickness), with the Magente color separation and overlying black color separation.

Exposure time about 2 to 3min.

2. Exposure of the middle layer via the glass filter combination BG 3 / GG 15, code no. 622/742 (each 2 mm thick), with the cyan color patch and overlying black color separation.

Exposure time about 1 to 2min.

3. Exposure of the undercoat over glass filter OG 4, Code No.751 (2mm thickness), with the yellow color separation and overlying black color separation.

Exposure time about 1 to 2min. The result is an image in accordance with Example 1, wherein the three halftone partial images compared to Example 1 all in

another layer.

In the upper layer, the Magenta Rasteneilbild forms in the middle layer, the cyan Rastererteilbitd and in the lower layer the Yellow component halftone image. Example 9 According to Example 2 and Example 5 is on a casting machine with scraper and Abspülsystem following Multilayer material produced: Undercoat: 11% cellulose triacetate solution in methylene chloride / methanol

4.5 g of 2-morpholino-3,6-diethoxybenzendiazonium tetrafluoroborate

5 g of 2-morpholino-3,6-dibutoxybenzendiazonium tetrafluoroborate

11g dibenzoylmethane

2 g sulfosalicylic acid

Interlayer: polystyrene 1% in tetra Middle layer: 11 polyvinyl acetate 18% in ethanol

3.5 g of S-methoxy ^ -pyrrolidino-benzene diazonium tetrafluoroborate

3.5 g of 3-benzal-hydrazino-4-amino-1,2,4-triazole

4 g of Ni "isobutoxyacetate

2 g sulfosalicylic acid

Intermediate layer; Polvcryren 2% in Tetra Upper layer: II polyvinyl acetate 18% in ethanol

1 g of 2-methoxy-4-diethylaminobenzendiazonium tetrafluoroborate

1 g of 4-diethylaminobenzendtazonium tetrafluoroborate

3 g of 1-benzyl-4-benzalamino-1,2,4-triazolium chloride

1 g sulfosalicylic acid

About 25 to 30 m ^{2 of} a multilayer material are obtained on paper, which is exposed as follows: The exposure apparatus and the aids used correspond to those in Example The following three separate exposure steps refer to 300mm distance between light source and exposure plane:

1. Exposure of the upper layer over the glass filter UG 11, code no. 602 (2 mm thickness), with the magenta color separation and overlying black color enhancement.

Exposure time about 2 to 3min.

2. Exposure of the middle layer via the glass filter combination BG 3 / GG 15, code no. 622/742 (each 2-mm- Dir.ke), with the cyan-Fa (excerpt and overlying black color separation.

Exposure time about 1 to 2min.

3. Exposure of the lower layer via the glass filter combination BG 23 / GG 14 Code no. 654/746 (yes 2 mm thickness), with the yellow color separation and overlying black color separation.

Exposure time about 1 to 2 min. The result is a GiId development according to Example 1, wherein the three halftone partial images compared to Example 1 all in

another layer.

In the upper layer, the magenta halftone subimage image forms, in the middle layer the cyan halftimber image and in the lower layer the Yellow component halftone image. Example 10 On baryta paper, a color-proof material of the following composition is cast according to Example 1: Undercoat: 1g postchlorinated PVC

9 g of ethylene chloride

0.06 g of 2-morpholino-3, e-diethoxybenzendiazonium tetrafluoroborate

0.08 g of benzoylacetic anilide

0.02 s of p-toluenesulfonic acid

Middle layer: 2 g polyvinyl butyral

8 g of ethanol

0.02 g of 2,5-diethoxy-4-morpholinobenzendiazonium tetrafluorobGr3!

0.02 g of 2,5-dibutoxy-4-morpholinobenzendiazonium tetrafluorobenzoate

0.04 g of 2-hydroxy-6-methoxy-3-naphthaic acid-2'-anisidide

0.005 g of p-sulfonic acid

Interlayer: polystyrene 3% in tetra Upper layer: 2 g polyvinyl butyral

8g ethanol

0.02 g of 2-methoxy-4-diethylaminobenzenediazonium tetrafluoroborate

0.02 g of 1-benzyl-4-benzalamino-1,2,4-triazolium bromide

0.005 g of p-Coluensulfonsäure

This gives about 0.01 m ^{J of} a color-proof material. This is illuminated as follows: The exposure apparatus and the aids used correspond to those in Example 1. The following three separate imaging steps refer to a distance of 300 mm between the light source and the exposure plane.

1. Exposure of the upper layer over the glass filter UG 11, code no. 602 (2 mm thickness), with the magenta color scheme and overlying black color separation.

Exposure time about 2 to 3 min.

2. exposure of the middle layer via the Giasfilterkombinatijn 3G 3 / GA 40, code no. 832/741 (2 mm / 4 mm thickness), with cyan color separation and overlying black color.

Exposure time about 1 to 2 min.

3. Exposure of the lower layer over the glass filter OG 4, Coc e no. 751 (2 mm thick), with the yellow color separation and overlying black color separation.

Exposure time about 1 to 2min. During development, an image is formed according to Example 1, whereby the three halftone partial images opposite Beispiol 1 all in

another layer.

In the upper layer, the Magenta Fastteilbild forms, in the middle layer of the Cy on-Anasterteilbild and in the lower layer of the Yellow component halftone image. Example 11

By exposing a photosensitive layer without color separation templates, it can be completely excluded from the image structure. You can create raster images with only two primary colors (except black). A diazotype material is used which is prepared according to Example 2. The exposure apparatus and the aids used correspond to those in Example 1. The following three separate exposure steps relate to 300 mm distance between light source and Balichtungsobens:

1. Exposure of the upper layer Above the glass filter UG 11, code no. 602 (2 mm thickness), with the oelb color separation. Exposure time about 2 bit; 3 min.

2. 'Middle layer exposure Above the glass filter combination BG 3 / GG 15, Code No. 622/742 (each 2 mm thick), with the cyan color separation.

Exposure time about 1 to 2min.

3. Exposure of the lower layer via the glass filter OG 4, code no. 751 (2 mm thickness), without exposure. Exposure time about 1 to 2min.

The result is an image in accordance with Example 1 with the difference that is now in the upper layer, the yellow halftone subimage image and in the middle layer, the cyan halftone subpicture. A magenta halftone partial image is not created due to the complete exposure of the lower layer. An image is obtained which is composed only of the yellow and cyan halftone images.

Example 12

By copying, for example, the magenta color separation on the yellow-forming color layer, the yellow color separation on the cyan-forming color layer and the cyan color separation on the magenta-forming color layer, one obtains a false color raster image. The image spots colored in the color-corrected image Magnnta are rendered as yellow, the yellow-colored image sites as cyan and the cyan colored image sites as magenta.

One uses a diazotype material, which is heigestellt according to Example 2. The exposure apparatus and the aids used correspond to those in Example 1

 The following three separate exposure steps refer to a distance of 300mm between the light source and the exposure plane:

1. Exposure of the top layer over the glass felt UG 11, Code No.602 (2 mm thickness), with the magenta color separation and overlying black & white color out (|.

Exposure time about 2 to 3> * nin.

2. Exposure of the middle layer via the glass filler combination BG 3 / GQ 15, Code No. 622/742 (2 mm thickness each), with the GeIb-Ferbauszug and the original black color separation.

Exposure time about Ί to 2 min.

3. Exposure of the underlayer over the <G'asfilterkomliinetion BG 23 / GG M, Code No.654 / 746 (2-mm thickness each), with the cyan color separation and overlying black color separation.

Exposure time about 1 to 2min. In the process of development, a picture is formed in accordance with E '"ii: piel 1, with the difference that now in the upper class, the picture Yellow halftone partial image (on the colored image in the Magiinta colored areas) and in the middle layer the cyan halftone partial image (on

the yellow-colored areas in the color-accurate image) are:. The magenta halftone partial image is formed by the lower layer (on the cyan-colored lobes in the true-to-life image).

By bbliobigiit pre-exchanging and Konbinieien the many color separations can use different Falschfarbenbilder

different Farleindiücken be easily made.

Claims (2)

-1- 278 416 Claims: 1. A process for the preparation of color proof images, characterized in that a three on a support one above the other, one or more diazonium salts and color coupler containing photosensitive layers containing multi-layer diazotypismeterial, which is known per se in which approach two photosensitive layers in their Absorpiionsmaxima to 20 nm and the absorption spectra of these layers overlap only in the region of each edge and a third photosensitive layer in its absorption maximum at least 60 nm apart from the other photosensitive layers has black and white carbon separation templates with filtered light matched to dta three photosensitive layers in the three Spectral regions and is developed in the manner known for diazotype materials. 2. Process for the preparation before. hwbprüfbildern according to claim 1, characterized in that the exposure of the photosensitive layers, which approach to a distance of the absorption maxima of 20 nm, in the short wavelength absorbing layer in the region of the rising edge of the absorption curve u id in the long wavelength absorbing layer in the Descent slope of the absorption curve, as well as in the third photosensitive layer in the region of the maximum and of the absorption curves of the other two photosensitive layers facing away from her absorption curve.