DD291170A5 - DIAZOTYPE MATERIAL ON NONTRANSPARENT DOCUMENT FOR REPRODUCING BLACK / WHITE FILM TEMPLATES - Google Patents

Abstract

The invention relates to a green sensitive diazotype material for the reproduction of black / Weisz film masters. According to the present invention, the diazotype material between the support and the photosensitive layer contains a dye layer containing a dye of the general structural formula wherein R1, R2 are the same or different, H, alkyl groups of 1-10 carbon atoms, aralkyl groups, R3, R4 are the same or different, H, alkyl groups , Halogen and X signify an anion. Resolution and detail reproduction are improved. Structural formula {Diazotype material green sensitive, dye layer; Detail reproduction; angular resolution}

Description

Field of application of the invention

The invention relates to a green-sensitive diazotype material on a nontransparent base for the reproduction of black and white film documents.

Characteristic of the known state of the art

Diazotype layers on transparent substrates fulfill the requirements with respect to detail reproduction and resolving power in the reproduction of imagewise finely structured film masters (eg dot matrix images) owing to the molecularly disperse distribution of the photosensitive components and compliance with reprotechnical standards (H. Böttcher, J. Epperlein, Moderne photographic Systeme, Deutscher Verlag für Grundstoffindustrie, Leipzig, 1983, MS Dinaburg, Photosensitive Diazo Compounds, The Focal Press, London, New York).

For diazotype materials on nontransparent documents, detail reproduction and resolving power are among others. depending on the degree of conformity of the self-absorption areas of diazotype layer and underlay. In known technical solutions, e.g. Tint papers, the two self-absorption ranges are nearly identical since either UV-sensitive or blue-sensitive diazotype layers are combined with white or slightly yellowish papers. At the same time, these carrier papers thus assume the function of a reflection light farm protection. If the absorption maxima of the diazonium salts used exceed 420 mm, the paper can no longer fulfill its function as antihalation and there is a universal loss of information in the reproduction of fine structures (for example halftone dots).

Object of the invention

The aim of the invention is a green-sensitive diazotype material on non-transparent white base with good reproduction properties of black and white film templates.

Explanation of the essence of the invention

The object of the invention is to provide a green-sensitive diazotype material on non-transparent white base, which ensures good detail reproduction and high resolution.

According to the invention the object is achieved by a dye layer is disposed in a green-sensitive Diazotypiematerial on non-transparent backing for the reproduction of black and white film templates between base and photosensitive layer, which is a dye of the general structural formula

/ ': он

(D

R ¹ u. R * H, alkyl groups with 1 to 10

(same or different) carbon atoms, aralkyl groups

R ³ u. R ⁴ H, alkyl groups, halogens (identical or different)

X "anion

The green-sensitive diazotype layer consists of a red diazonium salt such as 2-morpholino-3,6-diethoxybenzendiazonium tetrafluoroborate, color couplers (eg, acetoacetanilide), stabilizer acid (eg, p-toluenesulfonic acid) and binders (polymers). The red dye layer consists of dye, additives, eg. B. stabilizer acid and binder. As a base preferably different white paper types are used, but also plastic materials are possible. The backing may optionally be provided with a subbing layer as a surface seal or adhesive layer. Surprisingly, in the case of the o-hydroxy-styryl-benzopyrylium salts corresponding to the general structural formula 1, a complete irreversible discoloration occurs in the layer during the development process in an ammonia atmosphere. Numerous other dyes can be decolorized by the action of basic compounds, such as those used in the diazotype as developing agents. However, the basification of polymer layers with gaseous bases is not permanent.

By more or less rapid evaporation of the developer substance, the dye layer is acidic again by the remaining stabilizer acid. As a result, the dyes are undesirably formed back.

For exposure, light sources emitting intense radiation including the spectral range of about 480-550 nm can be used (e.g., high pressure discharge lamps, tungsten filament halogen lamps, lasers). Very good detail reproduction and a high resolution in the reproduction of transparent black and white film templates are achieved. During the development process, an arbitrary color image depending on the color coupler is produced on a white background.

embodiments example 1

On an area of 1 m ^{2 of} polyethylene-coated paper is applied a polymer solution having the following composition:

3g PVC (postchlorinated)

27 g of a mixture of ethylene chloride / methylene chloride in equal parts

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

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

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

45 mg of p-toluenesulfonic acid

Drying gives a green-sensitive single layer of about 3-4 thousandth thickness. After the exposure of a finely structured black and white image with green light in the vacuum frame and subsequent development, a purple image with poor detail reproduction and low resolution on a white background appears. Microlines below about 50% are no longer reproduced

 In the following examples, the image-enhancing red filter dye layer is placed under the diazotype layer.

Example 2 From a casting machine with Abstreichgießer a two-layer material is prepared in the following manner. On polyethylene-coated paper is first applied with the Abstreichgießer the red dye layer, so that the Wet layer thickness is about 100μηι. The polymer solution for the dye layer has the following composition:

1500 ml propene-maleic anhydride dye of the general structure 1 with

R ³ R ⁴ H

R ¹ R ² CH ₃

3.0 g Χ "Cr

1.5 g of p-toluenesulfonic acid

During the machine run, the layer is dried at temperatures around 70 ^° C. Then the diazotype layer is applied. The polymer solution has the following composition:

1500 ml polyvinyl acetate

8% in methylene chloride

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

3.9 g of 2-hydroxy-3-naphthoic acid 2'-anisidide

2.4 g of p-toluenesulfonic acid

The drying can be carried out at temperatures up to 80 ⁰ C. After exposure and development, a purple dye image is formed on a white background. When using green copy light and a vacuum copier frame, microlines of 6pm can still be crisp.

Example 3

According to Example 2, an intermediate film of the following composition is prepared:

Dye layer: polyvinyl alcohol 1500 ml 5% in water Dye of general structure 1 with 3.2 g R ² , R ³ , R ⁴ H R ¹ CH ₃ χ- ci p-toluenesulfonic acid 20g diazotype: polyvinyl butyral 1500 ml 19% in methanol a-cyano-.beta. [3- (1-ethyl-2-phenyl-indolyl) 11.0 g dibenzoylmethane 3.0 g p-toluenesulfonic acid 1.5g

After exposure and development, a yellow dye image is obtained with good detail reproduction and high resolution.

Example 4

According to Example 2, a two-layer material of the following composition is prepared:

Dye layer: Styrene-maleic anhydride 1 500 ml 15% in ethanol Dye of the general structure (1) with 3.8 g R ¹ , R ³ , R ⁴ H R ² CH ₂ -Ph X "BF ₄ " p-toluenesulfonic acid 2g diazotype: PVC (postchlorinated) 1500 ml 10% in methylene chloride 2-morpholino-3,6-diethoxybenzendiazoniumtetrafluoroborat 9g Benzoylessigsäureanilid 6g p-toluenesulfonic acid 2.3 g

After exposure and development, a yellow dye image is obtained with good detail reproduction and high resolution.

Example 5

According to Example 2, a two-layer material of the following composition is prepared:

Dye layer:

1500 ml of styrene-maleic anhydride

15% in ethanol

3.0 g of dye of the general structure (1) with

R ¹ , R ² , R ⁴ H

R ³ Cl

X "СГ

20 g of p-toluenesulfonic acid

diazotype:

1 500 ml of polyvinyl acetate

8% in methylene chloride

10 g of α-cyano-β- [2- (1-methylpyryl)] - styryl-4-diazonium trichloroacetate

8g 2-hydroxy-3-naphthoic acid 2'-anisidide

1.5 g of p-toluenesulfonic acid

After exposure and development, a purple dye image with good detail reproduction and high resolution results.

Claims (1)

Green-sensitive diazotype material on a nontransparent base for reproducing black-and-white film masters, characterized in that a dye layer which comprises a dye of the general structural formula is disposed between the base and the photosensitive layer contains, in the R ¹ , R ^{2 are} identical or different, H, alkyl groups having 1 to 10 carbon atoms, aralkyl groups, R ³ , R ^{4 are} identical or different, H is alkyl groups, halogens and X ^{е is} an anion.