DD251216A1 - diazotype - Google Patents

Abstract

The invention relates to a diazotype material for recording information. The aim and the object are to provide a highly sensitive material with improved properties which is sensitized in the spectral range between 480 and 570 nm. According to the invention contains the diazotype material, consisting of pad and binder-containing layer. Couplers, stabilizer acid and optionally further addition of at least one diazonium salt of the formula wherein R is C1-C4-alkyl; R1 H, C1 C10 alkyl, C1 C8 alkoxy, halogen; A, Z, Y are the same or different atoms or groups of atoms to form a saturated or unsaturated heterocyclic ring system, optionally with a fused aromatic system; mean a double bond Xe anion, contains. formula

Description

Field of application of the invention

The invention relates to a diazotype material for recording information.

Characteristic of the known technical solutions

Diazotype materials consist of photosensitive diazonium components, which are nonradiative capable of reacting with couplers, which are either in the layer system or in the development bath, under the action of bases to form colored azo compounds. At the exposed areas no coupling is possible. (J. Munder in G. Haase (Ed), Scientific Principles of Reprography, Hannover, [1975], p. 120; M. Dinaburg, Photosensitive Diazo Compounds, Focal Press, London New York [1964]).

The essential characteristic parameters of diazotype materials are photosensitivity, spectral behavior, thermal stability, coupling speed, maximum and minimum density, gradation, color and stability of the image dyes. The photosensitivity is essentially determined by the type and concentration of the diazonium salts used.

The disadvantage of conventional diazotype materials, to be sensitive only in the UV range, can be eliminated by the use of colored diazonium components (DE-AS 1 269480, US Pat.

US-PS 2660526, DD-PS 157939, DD-PS 208245). For certain purposes, diazonium components are required whose absorption maxima are in the range of 480-570 nm. Materials which satisfy this requirement are described in DD-PS 148910, DD-PS 157940 and DD-PS 154402. A disadvantage of the systems shown is the low sensitivity compared to conventional diazotype materials, which is due to the low quantum yield of the diazonium salts used. The quantum yields colored Stilbendiazoniumsalze as they are listed in the said patent 148,910, are in polymeric binders in the range of 10 ~ ³ to 10 ~. ² The quantum yield of the commonly used 4-dialkylaminobenzediazonium salts is 0.2-0.4 under comparable conditions.

Object of the invention

The aim of the invention is to produce a diazotype material with improved properties in a simple manner.

Essence of the invention

The object of the invention is to provide a highly sensitive, for the spectral range between 480 and 570nm sensitized diazotype material.

According to the invention the object is achieved by the diazotype material, consisting of base and binder-containing layer with at least one diazonium salt, couplers, stabilizer acid and optionally further additives, at least one diazonium salt of the general formula

0ο

_ ^R l

in which

R is an alkyl group of 1 to 4 carbon atoms

R _{1 is} hydrogen, alkyl group of 1 to 10 carbon atoms, halogen

Α, Ζ, Υ are identical or different, atoms or atomic groups to form a saturated or unsaturated heterocyclic ring system, optionally with fused aromatic system and these atoms are carbon, oxygen, nitrogen, sulfur, selenium, wherein the carbon with hydrogen and alkyl groups, the Nitrogen may be substituted with alkyl groups, a

Double bond X® an anion

mean, contains.

As anions to the diazonium cations preferably find such complex anions application that stabilize the cation, such as. BF ₄ ", ZnCl ₄ ", SbCl ₆ ", SbF ₆ ", CdCl ₄ "".

To prepare a Diazogießlösung the individual components are introduced into the solution of a binder. Examples of suitable solvents are the readily volatile, short-chain, aliphatic alcohols, ketones and chlorinated hydrocarbons or mixtures thereof.

Suitable binders are all film-forming, transparent matrix-producing, water-swellable, permeable as possible polymers, such as cellulose derivatives, copolymers of acrylates and acrylic acid and polyethylene oxides. As a coupler can be for the inventive material 2-naphthol, 2,3-dinaphthols and Hydroxynaphthoesäurederivate u.a. use.

Suitable stabilizers are organic, readily soluble, low-volatility acids, such as 4-toluenesulfonic acid, sulfosalicylic acid, oxalic acid, tartaric acid, citric acid and the like. As other additives, plasticizers (diethyl phthalate, dibutyl phthalate, dioctyl phthalate, tricresyl phosphate, etc.), image dye stabilizers (hindered phenols, aromatic substituted amines, hydroquinone dialkyl ethers, phosphoric acid phenyl ester derivatives, etc.) and antifoggants (stilbene derivatives) may be incorporated.

To prepare the diazotype material, the pouring solution is poured onto a substrate and the resulting layer is dried. Suitable substrates include polymer films, paper, glass and metal foils. The diazotype materials according to the invention have a high sensitivity in the range between 480 and 570 nm.

embodiments example 1

On an area of 10 to 15 m ^{2 of} a suitable support, ma η pours 1000 ml of a 7.5% cellulose acetate solution in methylene chloride / methanol containing the following components: 7.8 g of the compound

Z ⁴ " ⁹

⁵¹⁶

8.5 g of 2-hydroxy-3-naphthoic acid 2'-anisidide 0.5 g sulfonic salicylic acid.

After exposure of a template with a xenon lamp and development with ammonia gives a purple positive image of the template, the maximum of image dye absorption is 560 nm.

Example 2

Cast a diazo system according to Example 1, instead of the 8.5 g of 2-hydroxy-3-naphthoic acid 2'-anisidide is used as a coupler, the equimolar amount of benzaldehyde-2-pyridylhydrazon and in addition the same number of moles NickeMf-butyrate. After coupling, a brilliant blue-green image dye with an absorption maximum at 677 nm is obtained.

Example 3

On an area of 10 to 15 m ² polyethylene terephthalate backing, 1000 ml of a 7.5% polyvinyl butyral solution in ethanol / acetone are poured, containing the following components:

9.6 g

BF ^θ Λ

max = 483 nm

Cl

10.2 g of 2-hydroxy-3-naphthoic acid anilide 0.4 g of 4-toluenesulfonic acid After exposure and development according to Example 1, a blue positive image of the original is obtained.

Example 4

In 10 ml of a 10% solution of F-celite in methanol / methylene chloride, 11.5 g of the diazonium salt

^C 2 ^H 5

and 0.8 g of 4-toluenesulfonic dissolved and shed by means of a slot caster to 15 m ² subbed transparent substrate made of polyethylene terephthalate and dried. You get a transparent red film. After imagewise exposure, the film is developed in a solution having the following composition: 1000 ml of water 40 g of sodium carbonate 15 g of ammonium chloride

25g phloroglycin A positive red-brown image of the original is obtained.

Claims (1)

Diazotype material consisting of base and binder-containing layer with at least one diazonium salt, couplers, stabilizer acid, characterized in that it contains at least one diazonium salt of the general formula R is an alkyl group having 1 to 4 carbon atoms, R-I is hydrogen, alkyl group of 1 to 10 carbon atoms, alkoxy group with 1 to 8 carbon atoms, halogen, Α, Ζ, Υ are the same or different atoms or atomic groups to form a saturated or unsaturated heterocyclic ring system, optionally with fused aromatic system and these atoms are carbon, oxygen, nitrogen, sulfur, selenium, where the carbon with hydrogen and alkyl groups, the nitrogen may be substituted with alkyl groups, a double formation X® an anion mean, contains.