DD144130A1 - METHOD FOR PRODUCING PHOTOGRAPHIC ONE OR MULTICOLOR PICTURES - Google Patents

Abstract

The invention relates to the method for the production of images on the basis of Silver halide emulsions in the image formation of azo dyes, in which by separation of the i Development and color formation process replaces the equivalent equivalent coupling with the equivalent moiety becomes. Here, the silver of the exposed and black-white developed material in a poorly soluble Siiberverbindurig transferred and these in a conversion step in a sparingly soluble Converted silver diazotate. Subsequently, in a coupling bath to an azo dye coupled and the silver salt herausgeiöst from the layer. The color restoration quality of the materials is to be improved by using a coupling components for cyan monoazo dyes. It substituted diaminonaphthalenes are used, which are good light stabilizers to bia-green dyes to lead. This makes it possible, by means of a Diazotates all 3 necessary for a subtractive process To form dyes. ,

Description

'3 2 8 7

Field of application of the invention . ;

The invention relates to a process for the preparation of single or multi-color photographic images based on silver halide materials in the case of image-forming azo dyes.

Characteristic of the known technical solutions

On the basis of the present state of knowledge, it is still necessary for the photosensitivity-based and all other processes-initiating substance in the photographic imaging materials to be silver halide. Attempts have already been made in numerous materials to reduce the use of silver or the silver halide. However, all previously used low-silver or magnetic-silver halide processes are unable to replace the conventional silver halides in terms of sensitivity, universal applicability, and in part also in terms of economics.

In the meantime, the silver halide used in the world today "color materials that work on the basis of chromogen development or dye diffusion, modified silver halide variants were developed, the characteristics of which reduced silver use and the associated advantages such as improved economy, through thinner layers improved image quality and reduced processing times are *

The DRP 561 867 proposes a process for the preparation of single and multicolor photographic images on the bases of azo dyes which are formed by reaction of a silver diazotate with a coupling component in an acidic or alkaline medium. This is based on the known black-and-white development of the imagewise exposed material in the negative procedure 'the remaining silver halide dissolved out in a known manner, the developed silver bleached and converted the resulting silver salt in a neutral or alkaline medium by conversion to a less soluble silver diazotate in an acid coupling bath, this compound is introduced into the layer or in the layer contained coupler converted to an azo dye. The same applies to composite coatings "Since the process described is an equiva- lent coupling, ie, one mol of dye is formed per mol of silver, a significant silver saving is achieved in principle." A process based on the same mode of action is also P 132 252 presented «

The essential components of these photographic color inatials are the color couplers, which form "coupling with a diazonium component, forming 3 yellows of color" purple and blue-green, which form the basis of the subtractive color reproduction. "The careful matching of the 3 colors achieved is the faithful color reproduction, The Couplers themselves must not absorb in the visible part of the spectrum «

The obtained dye must have a spectral purity. In the 'DHP 56I 867 patent, Η-acid is used as the blue component. The more direct one arrives at blue pictures, if one converts 2,3-Oxynap- Mlioesäure ~ _< JC "naphthalid with Tetrazodianisidin; As described in the DRP 735 261 in the patent literature are so far no couplers that produce a cyan monoazo dye. The preparation of blue-green monoazo of arb st of fen is very difficult, since high demands are placed on both the coupler and the diazonium component.

Zie-1 of the invention

The object of the invention is a process for the preparation of photographic images based on silver halide materials by the production of azo dyes, in which images with improved quality of color reproduction can be obtained me . ,

Indung discourse, the Vfesens of Erf. ". '·.

The object of the invention is to find suitable coupling components which react with the sparingly soluble silver diazotates formed from the silver halide and the converting agent to form blue-green azo dyes. The aim is to ensure the i-equivalent principle, d _e h «1 mol of silver halide is converted in the conversion step, to 1 mole Silberdiazotat which forms with the coupler a monoazo dye" A diazo coupling must be ~ excluded for maintaining the 1- iquivalentprinzipsdurch suitable Reaktionsführüng.

According to the invention the object is achieved in that substituted as a coupling component for blue to blue-green dyes

4 «

-4 - :. 91 3 2 87

Diaminonaphthalenes of the general formula

in the

F, and Rp = identical or different H, alkyl radical with 1 to

Carbon atoms do . = Acy Ire st with 4-18, preferably 8-12 carbon atoms

R = SO-, _{s is} halogen alkoxy

mean to be used «

For a given diazo component, by suitable choice of the couplers and their substituents, can the properties of the resulting polyesters be determined _? such as light and bleach resistance and their absorption behavior. The coupling components used are dispersed in the photosensitive layer. "Due to the nature of the introduction, residues such as alleyl chains are introduced at the coupler molecule, preventing diffusion. The advantage of the couplers according to the invention is that photographically suitable blue-green monoazo dyestuffs with good light stability can be formed with suitable slide zonium components. This makes it possible to form all three dyes necessary for a subtractive process by means of a diazotate.

213 2 87

Exercise le Example 1 -

A monolayer photographic material based on a silver chloride / silver bromide emulsion containing Coupling Component 1 or 2 is exposed for 5 seconds and processed in the following baths:

Black ^ white layer 2 min

Monomethy1-p-aminophenol sulfate 1 »5 g

Sodium sulfite 18 g "'.

Hydroquinone 2.5 g

Potassium carbonate 18 g

Fill potassium bromide Ig to 1 l with water

Fix stopper hardness; 2 min

sodium sulphite 7,5g

Sodium acetate 15. g acetic acid conc. "25 ml

Potassium aluminum sulfate 25 g

Dilute sodium thiosulphate 128 g with water to 1 liter

Watering 1 min

Bleaching 15 s

Potassium dichromate 17 g

Sulfuric acid 10 ₈ 7 ml '

Sodium chloride. Add 20 g with water to 1 liter

Watering 1 min

clarify

5% sodium bisulfite lye water

1 min

1 min

Convert

Benzothiazole ~ 2-diazotate water

Water

10 min

500 mg 1 1

1 min

Color development CKupp1ung)

0 _s 1 η hydrochloric acid potassium dichromate 2 min 1 1

500 mg

Fix

sodium thiosulfate

called potassium

Make up to 1 liter with water. Abs. drainage T min

250 g 50 g

The following color images were obtained with the coupling components present in the layer. \

Coupling component color

naphthalene

1 -N, U-Dime thy lamino-5-ctode coyaminonaphthalene '

b lau

blue

-

Example 2

A monolayer photographic material based on a silver chloride / silver bromide emulsion containing coupling component 3 or 4 is exposed analogously to Example 1 and processed until bleaching. Further processing takes place as indicated

Färb kup p development. 3 min ..-

Benzisothiazole-3-azodate 50 mg

0, Tn hydrochloric acid 50.'ml

Fix 1 min

It has hi ο sulfate 250 mg

Potassium bisulfite 50g

fill with V / asser to 11

Watering, 4 min

With the couplers in the layer, the following color images are obtained,

Coupling component color

3x1-N, N-dimethylamino-5-dodecoylamino

naphthalene teal

4o 1-amino-5-nonanoylamino-naphthalene blue

Example 3

The coupling component 5 is introduced into simple gelatin layers and is coupled as follows:

clutch

Benzisothiazole ~ 3-diazonium salt 0.1 η hydrochloric acid

Water

c- ¹

5 min

50 mg 50 ml

1 0 min

The results obtained were as follows

Coupling component color

1-H ₃ , N-Dime thy lamino-5- "nonanoy laminonaphthalene blue-green

Claims (1)

E r f i i n d u η g s a η s p r u c h. A process for the preparation of single- or multi-color photographic images based on coupler-containing silver halide emulsions, wherein, after the black-and-white development of the material, the image silver is converted into a sparingly soluble silver compound and converted into a diazotate with a coupler, azo dye, forms, then the silver salt out of the layer, characterized in that as a coupling component for blue to blue-green dyes substituted 1j5 ©! aminonaphthalenes of the general formula R «ro ' NHR ₃ in the . R ₁ and R p = the same or different, H, alkyl with 1-4 carbon atoms _:. atoms Ro ^: = acyl residue with 4-18 preferably 8-12 carbon atoms _; .R-. ^: ... =. SO ₃ Hj halogen, alkoxy meanj be used »·