DD144132A1 - 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 Development and color forming process the multi-equivalent coupling through the one-way clutch is replaced. In this case, the silver of the exposed and black-white-eritwickeiten material in a poorly soluble silver compound converts this into a sparingly soluble one in a conversion step Converted silver diazotate. Subsequently, in a coupling bath to an azo dye coupled and the Silbersaiz removed from the layer. The color rendering quality of the materials is intended by using magenta couplers that have a low pH dependence of the color of the having resulting dye, are not sensitive to oxidation and diffusion, improved become. Alkanoylamihosübstituierte as coupling component for purple monoazo v / erden '2-aminothiazoles' used. They have improved spectral behavior. This will be the Overall color reproduction improved.

Description

Any / endurigsg e ^ Bidding of the invention

The invention relates to a method for the production of photographic "engravings". ^; - multi-color agents; ^ on the basis of silver halide materials for the image-forming production of azo colorants

Characteristic: the known technical solutions

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On the basis of the present state of knowledge, it is still necessary that the photosensitivity-based and all further processes, the triggering substance in the photographic recording materials, be silver halide. It has already been attempted in silver-rich materials to reduce the use of silver. the silver halide completely 'too. However, all hitherto used low-silver or light-halogen processes are not in the position, but sensitivity, universality, and in part also the economy of replacing conventional silver halide materials. "

In addition to the silver halide color materials which are now used worldwide and which work on the basis of chromogen development or dye diffusion, modified silver halide Colorvari.ant.en have also been developed. their characteristic is the reduced use of silver and the associated advantage © (improved economy through thinner layers, improved image quality and shortened processing pages). , , '

In the DRP 561 86? and DD-P 132 * 552 discloses a process for preparing single or multi-color photographic images based on azo dyes which are formed by reaction of a silver overbiasate with a coupling component in an acidic or alkaline medium. In this case, according to the known Schwara white development of the imagewise exposed material at the negative process side, the remaining silver halide dissolved out in a known manner, the., Developed silver bleached and converted the resulting silver in neutral or alkaline medium by conversion to a sparingly soluble SiIberdiazotat In an acidic coupling starting from ad, this compound is converted into an azo dye with a coupler incorporated in the layer. The same applies to layered composites. Since the described process is an equivalent coupling, d _s h _e per mole of silver, one mole of dye is formed in the prin zip achieved a significant SiI savings

Essential components of these photographic color materials are the color couplers _s . by coupling with a Diazoniomkomponente the three dyes Geib, - form form magenta and cyan, · welche'die basis der.'substr-active 'color reproduction, "The careful matching of the three colors obtained is used for faithful color reproduction _β The couplers themselves may ^ besides other requirements, do not absorb in the visible part of the spectrum

The achieved _v e dye must have © ine spectral purity

In the patent DRP 561 867 Η-acid as magenta and as. Blue component, as well as 1 ~ amino ~ 8rnaphthol ~ 2 _i 4-disulfonic acid as magenta coupler. »The use of paramidobenzoyl ·» I acid is described in DRP 735 261 «The color couplers mentioned here have several disadvantages _β As aminonaphthols. with a I 0H "~ 5ruppe they have a strong pH-dependency: the coloring of the resulting dye on, one can use H ~> acid once as blue coupler, and the other as a red coupler *. , , In addition, H-acid is sensitive to oxidation »The dyes are also subject to a thermochromism« Moreover, these Därbstoffβ no favorable absorption course on «The 2» Aminothiazole _{s mentioned} in DD »P 132 552 as a magenta coupler, are not suitable for processing in the composite, both single layer as well as multi-layer, because they are not diffusion-proof and dissolve out of the layer during the process of developing. ..

The object of the invention is a process for the production 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.

Explanation of the essence of the invention

The object of the invention is to provide suitable and improved coupling components which are compatible with the sparingly soluble one formed from the silver halide and the impinging agent. Silberdiazotatj the umsetstj to the diazonium to purple azo dyes react · _$ au develop "The dyes produced with the Kupplunggskomponenten should succeed a pH" depending on the color does not aufweieeny oxy-.dationsempfindlich and dlffusipnsfest be "

The dye formed eoll no Ie ba. "Absorption in looks" cash portion of the spectrum be sitting _β It should be ensured ^ Cuh 'the Einäquivalentprinzip, 1 mol of silver ·. is reacted in Konvsrsionssehritt to 1 mole Silberdiazotat that wiederam with the coupler formed a Honoazofarbstoff A Bisazokupplimg ζ must be excluded for maintenance conservation of Einäqaivale-ntprinzips by suitable Reafetionsführung ''. '· · ... ·' · "'-. _

According to the invention, the object is thereby achieved that as a coupling component. for purple dyes' alkanoylamino-substituted 2-aminothiazoles of the general formula

R ₁ and Bo = the same or different

H, aryl "Subst..Aryl.; , :: ........

Ro = Acy! Rest with 3-18, preferably 8-12 carbon atoms

"mean to be used _o .:.,

The diffusivity of the dyes is determined by the alkanoylamino group in 4 ^? Position reached *:. '..' .... ...

With the given diazo component, the properties of the resulting dyes, such as light and bleach resistance, can be determined by suitable choice of the couplers and their substituents.

and their absorption behavior en-. influence";

The couplers according to the invention give purple azo dyes with benzothiazole diammonium components with good absorption properties (high extinction coefficients), without "visible absorption" in the visible region of the spectrum and good light stability β. Dependence on ₀ pas leads to an improved color rendering »- -

The coupling components used are dispersed in the light-sensitive layer.

From f oy img sbjei Sj3 iej. e_ Example 1

A single-layer photographic material based on a silver chloride / Silberbroinidemulsiony the azo coupler as a coupling component contains 1 or 2 _s is exposed 5 seconds and processed in the following baths.

Monomettiyl p- »aminophenol sulfate 1 * 5 g

Sodium sulphite 18 g hydroquinone - '.. 2> 5 g

Potassium carbonate 18, g potassium bromide. Fill up Ig with water to 1 liter

Sopphärtfixiereη 2.min

sodium sulphite, 7 »5g

Sodium acetate '.... , 15 g

Acetic acid concentrates 25 ml of potassium aluminum sulfate 25 g

Hatriuiathiosulfate 128 g with water to 1 1-fill

6 ~

Watering _:.

BleicMn '.' / · .. '..

Potassium thyroid chromate * Sulfuric acid · Sodium chloride. ,

make up to 1 liter with water

Watering.

Clarify. , '

5% sodium bisulphite lye

To water ' ^: '. ':': '1 min

  Kanvertiergn .. .10 min

Benzothiazole-2-diazotate. , 500 mg

11

17 & 10 7 ml 20 S 1 minute 1 min

¥ / ässern. T min

.2

O ₅ .1 η salic acid 11-

Potassium dichromate 500 mg

Fix

sodium thiosulfate. '·. , 250 g

Kaliumdisulfif.-. \ 50 g

Fill with water up to 1. 1

Drainage irrigation ·

With d @ n in the layers' located Kupp lung skorap one nt ene folgeMe _v color images obtained "

Coupling component color

aminophenyl) thiasol · purple.

2 2 ~ H ₉ N-diphenylamino "4- (4 ~ ^f stearoyl aminophenyl) thiazole purple

Example 2.

Clutch in. The solution

Prepare a con-centered coupler solution from 0.011 mol of coupler 3 or 4 "and acetone, add the appropriate molar amount of 2-benzothiazole diazotate, and adjust the solution with 0.1 N HCl."

You get the following colors

Coupling component color

3 2-lv ^T , H-diphenylamino-4- (4- ^t- propane-butyl-aminophenyl) -thiazole. purple

4 2-Hpl ™ diphenylamino ~ 4 ™ (4 ^! ~ NonanoylarainophenyD-thiazole purple

Absorbances were achieved by 14,000 ^χχ "" £ £,,, Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine Eine 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400 400

Is used as a coupling component 2-U, Έ ~ diphenylamino ~ 4- (4 "-dodecoylaminophenyl) -thiazole and as diazonium salt 2 _? 4 "^> dinitrobensoediasoniui diazotate is also obtained as a purple color«

8th -"

Claims (1)

Invention s η s ρ r u. e h A process for the preparation of single- or multi-color photographic images based on coupler-containing silver halide emulsions, which comprises reacting the material with silver halide emulsion to convert the image silver into a sparingly soluble compound into a diazotate with a coupler forming an azo dye, and then the Silbersalz'aus the layer _'s dissolves characterized in that the coupling component jfür purple dyes alkahoylamino substltuierte-2-Aiainothiasole of the general formula · .--. · R and R »are the same or different
H ₅ arylj Subst »aryl R ^. s Acy Irish st. with 3- ⁵ IS vorsogsweiee 8-12 carbon atoms mean * "? rwen & et become»