DE1264953B - Heat developable diazotype material - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN ^ Rl ^ PATENT OFFICE Int. Cl .:

G03c

EDITORIAL

German class: 57 b -42 / 05-

Number: 1264 953

File number: J 22930IX a / 57 b

Filing date: December 27, 1962

Opening day: March 28, 1968

The present invention relates to heat developables Diazotype materials composed of a layer support, optionally an intermediate layer and a light-sensitive Layer with a diazo compound, a polybasic carboxylic acid and optionally a binder.

The most commonly used photosensitive layers in known conventional diazo copying with diazo compounds contain a photo-decomposable diazonium salt, an organic ίο Coupling component and an acid. A material coated with such a composition is exposed through a negative or positive and thereby decomposes the diazonium salt, which the ent ' prevents winding in the exposed area. The exposed material is then treated with an alkaline Developing agents, such as gaseous ammonia, which increase the pH value and act as a color-forming agent Reaction between the undecomposed diazonium salt and the organic coupling conv component enables} treated.

It is also known that the organic coupling component is not used in the production of the diazotype material to combine with the diazonium salt, but together with the alkaline developer to be used after exposure of the diazotype material.

Both of the aforementioned materials have the disadvantage that they have a separate coupling component for Require generation of an azo dyes. The coupler is used in manufacture with the diazonium salt combined, there is a risk of premature coupling and the material possesses limited Shelf life. Both of the aforementioned types of materials require the use of a separate one Liquid to develop the image.

Diazo materials have also been used to eliminate the need for a separate developing liquid prepared that contain compounds that form alkaline development products when they decompose can deliver through heat. However, such diazo materials still require the presence a separate coupling component to form azo dyes.

Attempts to improve such diazonium salt coupler systems have also resulted in self-coupling Diazo materials used. Such materials contain diazonium compounds or mixtures such compounds, the compounds colored by reaction with their own photolysis products can deliver. When used, the materials are replaced by a negative to form the desired positive exposed. Adjustment heat developable diazotype material

Applicant:

International Business Machines Corporation,

Armonk, N. Y. (V. St. A.)

Representative:

Dipl.-Chem. Dr. L. Wessely, patent attorney,

8000 Munich 19, Montenstr. 9

Named as inventor:

Claude Max Aebi, Endicott, N.Y .;

Frank Walton Haining, Vestal, N. Y. (V. St. A.)

Claimed priority:

V. St. v. America December 29, 1961 (163 055)

the degree of exposure, the self-coupling compounds are partially decomposed, and the undecomposed portion reacts with the decomposition products to form the desired positive image in the exposed areas,

Such materials have no further. Application obtained as the images formed are not are stable and the contrast between the generated image and the background is low. Also have to Products of this type subsequently destroy the unexposed areas of the film any remaining undecomposed diazo material are treated. Besides, in general Such materials also require a step of alkaline development in order to be color-forming To bring the reaction to completion. The above materials are main usable in negative copying processes.

The present invention aims to provide thermally developable diazotype photosensitive materials with good shelf life that gives sharp, stable high-intensity images through a Able to deliver positive processes without a separate coupling component in the material would exist until thermal development and without the use of a separate development liquid.

It has now been found that diazotype materials which contain dicyandiamide are advantageous Have properties.

809 520/620

3 4

The solution to the task that the. Invention to be with the materials according to the invention

reasons, the copies are made by heating with a heat-developable after exposure

Diazotype material from a layer support, developed against a temperature of 120 to 150 ⁰ C,

if necessary an intermediate layer and a light- These diazotype materials according to the invention offer

sensitive layer with a diazo compound, 5 th the advantage that they lead to images that aich

a polybasic carboxylic acid and possibly by its sharpness, its depth of color and its good

a binding agent that contrasts with the substrate and its stability due to a content of di-contrast

cyandiamid is marked. compared to those obtained with known materials

According to the invention, the dicyandiamide can be awarded in the loan. It is of great importance light-sensitive layer or the optionally io that the diazotype according to the invention are present Interlayer or in the materials under conditions of high relative humidity are present. long periods of time without impairment in the

Preferred quantity ranges for the main stock in contrast to known diazotype materials

parts of the coating of the master according to the invention can be stored.

materials amount to 0.1 to 10 percent by weight of light - heat alone is enough to develop the sensitivity to one another Diazo compound, from 0.1 to 25 weight settlement, and so do not need ammonia percent polybasic carboxylic acid and 0.1 to 35 Ge and other developers to be used, weight percent dicyandiamide. Leave the diazotype materials according to the invention

To diazo compounds, which in the invention are therefore relatively simple diazo copiers

Appropriate materials should be used with devices, as there are no devices

for example the following: for developing liquids or for suction

γ-. ·.,. noxious fumes from by-products required

p-Diazo-N-methyl-N-hydroxyaniline · V ₂ zinc ^sln ^ _{e theoretical fundamentals of} performance

p-Diazodiethylanilm-Borfluorid, ²⁵ ™ * usefulness of the materials according to the invention

lN-MorphoHno-4-diazo-2,5-diathoxybenzene · ^Slnd ^ ht completely cleared. However, it is

¹ I Z'nk hl 'dd assume that when heated to 120 to 150 C.

tv ¹ ^ -J? IU ^{1 Y n} 1-4.1. 1 · ι · ι; τ- ι τ, ι -a coupler is formed. This coupler, in turn, p-Diazoethylhydroxylethylanilm · ¹ U Zmkchlond. J (*. ⁶ _T ,,, ", fi,, ..

^F ■> JJ ■> / 2 undergoes a coupling or color formation reaction

Satisfactory polybasic carboxylic acids for 30 with the diazo compound. The coupler is therefore

the materials according to the invention are for example in the material up to the moment of development

wise citric acid, maleic acid and malonic acid. not available, to which he then carried out in situ

In addition to the main components, namely diazo thermolytic reaction of the components formed Compound, polybasic carboxylic acid and dicyandi-will. This eliminates the problem of premature kuppamid, the materials according to the invention can develop and low storage stability in one step Additives such as film-forming environment with high humidity are completely eliminated. Resins and polymers, antioxidants, stabilizers These in situ formation of a coupler purely through and other known substances. Application of heat also switches off the requirement _ The materials according to the invention can be made by using a separate coupler. Covering or coating various layers. The materials according to the invention can be supports with one or more separate layers in all areas where diazotype materials getting produced. Thus, the dicyandiamide can usually be used in solution, in particular as and the solution on a paper base copier papers, for example in the reproduction of brought and dried. Recycle a solution of documents, plans, drawings. Diazo compound and a polybasic carbon 45

Acid can then be applied over the first coat of Example 1 and forming a double coat

dried on the carrier. If desired, 10 g cellulose acetate butyrate (viscosity V ₂ seconds)

You can also use dicyandiamide, the polybasic carbon monoxide, to be dissolved in 100 ml of methyl alcohol. The mixture

acid and the diazo compound all in the same 50 is used on a steam bath to speed up the process

Solvent dissolved and heated as a single layer to the dissolving process. Become this solution

Carrier are applied. then 5 g of malic acid, 1 g of dicyandiamide and 2 g

The preferred method is to use an IN-Morpholino-4-diazo-2,5-diethoxybenzene · ¹ I ₂ zinc

Dicyandiamide, a photosensitive diazo compound chloride added.

and a suitable polybasic carboxylic acid comprised of a polyterephthalic acid glycol ester film

Holding solution usually with the addition of an existing carrier is then thin with the above

binding or film-forming material to produce solution coated, with an adhesive film on the

and forming a carrier with such a solution under Carrier. The material obtained will

Forming a thin layer of coating. then about 20 seconds through a transparent

Separate solutions of the Dicyandi- 60 positive can also be exposed to ultraviolet light. After the amide and the photosensitive diazo compound exposure the product is 30 seconds and the acid prepared and heated to 15O ⁰ C separate successive 120, thereby forming a stable reddish arranged films of each of the solutions on a brown positive image. Carriers are made. . .

Furthermore, the carrier can with the solution of the Di- 65 B e 1 s ρ 1 e 1 2

cyandiamids are impregnated and then with a solution 4 g of colloidal silica are in 100 ml of water

the photosensitive diazo compound and the suspended. Then become this suspension

Acid coated. 5 g malonic acid, 2 g naphthalene-ljS ^ -trinodium sulfo-

η at, a stabilizer and 1 g of p-diazoethylhydroxylethylaniline * / ₂ zinc chloride were added.

A paper support is then thoroughly moistened with a saturated aqueous dicyandiamide solution and then dried. The treated paper is then coated with the above solution and dried.

The material prepared is exposed under a long transparent positive about 4 seconds with ultraviolet light and heated for about 30 seconds at 120 to 15O ⁰ C, with a stable positive red image is formed.

Example 3

15 g of dicyandiamide and 10 g of cellulose acetate butyrate (viscosity V ₂ seconds) are dissolved in 100 ml of ethylene glycol monomethyl ether. This solution is applied to a support and allowed to dry.

A second solution is made by dissolving 10 g of cellulose acetate butyrate (viscosity V2 second) in 100 ml of methyl alcohol with gentle warming and subsequent addition of 10 g of citric acid, Add 5 g of thiourea and 1 g of p-diazo-N-methyl-N-hydroxyethylaniline to this solution manufactured. A coating of this solution is then formed on top of the first coating and also dried.

The material thus obtained is then exposed to ultraviolet light for about 6 seconds under a transparent positive. After 30 seconds of heating at 120 to 15O ⁰ C, a stable violet image is formed.

Example 4

10 g of dicyandiamide and 2 g of cellulose acetate butyrate (viscosity 20 seconds) are dissolved in 100 ml of ethylene glycol monomethyl ether solved. This solution is applied as a layer to a paper support and allowed to dry.

A second solution is made by dissolving g maleic acid, 2.5 g aluminum sulfate and 2 g p-Diazodiethylaniline boron fluoride in 100 ml of an aqueous Polyvinyl acetate emulsion produced. The second solution is then based on the one from the first solution formed film is applied to form a double-coated support.

The material thus obtained is then exposed for 6 seconds under a transparent positive with ultraviolet light and heated for 30 seconds at 120 to 15O ⁰ C, thereby forming a stable brown image.

Claims (5)

Patent claims: 1. Heat developable diazotype material from a layer support, optionally an intermediate layer and a photosensitive layer containing a diazo compound, a polybasic carboxylic acid and optionally a binder, characterized in that it is dicyandiamide contains. 2. diazotype material according to claim 1, characterized in that the light-sensitive Layer that contains dicyandiamide. 3. diazotype material according to claim 2, characterized in that the light-sensitive Layer between 0.1 and 10 percent by weight diazo compound, between 0.1 and 25 percent by weight polybasic carboxylic acid and between 0.1 and 35 percent by weight of dicyandiamide. 4. diazotype material according to claim 1, characterized in that the layer support which contains dicyandiamide. 5. diazotype material according to claim 1, characterized in that the intermediate layer which contains dicyandiamide. Considered publications:
German patent specification No. 825 204. 809 520/620 3.68 © Bundesdruckerei Berlin