Patent Publication Number: US-3877949-A

Title: Photographic material for the silver dyestuff bleaching process

Description:
United States Patent Frohlich et al.  
 PHOTOGRAPHIC MATERIAL FOR THE SILVER DYESTUFF BLEACHING PROCESS Inventors: Alfred Frohlich, Marly; Hansrolf Loeffel, Berne, both of Switzerland Assignee: Ciba-Geigy AG, Basel, Switzerland Filed: Sept. 20, 1973 Appl. No.: 399,207  
 Related U.S. Application Data Continuation-inpart of Ser. No. 284,801, Aug. 30, 1972, abandoned, which is a division of Ser. No. 798,792, Feb. 12, 1969, abandoned.  
 Foreign Application Priority Data Feb. 15, 1968 Switzerland ..2253/68 U.S. Cl. 96/99; 96/20; 96/73;  
  260/169 Int. Cl G03c 1/10 Field of Search 96/99, 73  
 [ Apr. 15, 1975 [56] References Cited UNITED STATES PATENTS 2,286,714 6/1942 Chechak 96/99 3,443,953 5/1969 Loeffel 96/99 3,716,368 2/1973 Froehlich et a1 96/99 3,749,576 7/1973 Piller 96/99 Primary Examiner J. Travis Brown Attorney, Agent, or Firm.loseph G. Kolodny; Edward McC. Roberts; Prabodh l. Almaula [5 7] ABSTRACT 5 Claims, No Drawings A-N=N-B-Nl-lCO-E wherein A denotes a benzene or naphthalene residue which may be substituted by a halogen atom or an alkyl, alkoxy, nitro or acetylamino group and contains 1 to 3 sulphonic acid groups, B denotes a benzene residue which may be substituted by at most 2 halogen atoms or alkyl, alkoxy. hydroxyalkoxy, alkoxyalkoxy, acylamino, carboxyacylamino (for example a residue of formula HOOCCH -CH CONH), carboxyalkyl, carboxy or phenoxy groups or denotes a naph- 7 thalene residue, and wherein D denotes a benzene or naphthalene residue or a triazole residue, E deontes a benzene residue and G denotes a hydrogen atom or an alkyl group containing l to 5 carbon atoms, D and E each are unsubstituted or substituted by a halogen atom or an alkyl, alkoxy or phenyl group, the residues D and E -OG being different from one another, OG being bound to E in 2- or 4-position with relation to the azo group, A-N=NBNHCO being bound to D in non-adjacent position with relation to the azo group and AN= NBNH--C O- being bound to E in 3-position with relation to the azo group. naphthalene being The residue A of formula l may be for example derived from the following amines:  
  2-aminonaphthalene-4,8-disulphonic acid, Z-amino- 6-chloronaphthalene-4.8-disulphonic acid, 2-amino-6- acetylaminonaphthalene-4,8-disulphonic acid, 2- amino-6-nitronaphthalene-4,8-disulphonic acid, 2- aminonaphthalene-S,7-disulphonic acid, 1- aminonaphthalene-3,o-disulphonic acid, 2-  
 aminonaphthalene-4,6,8-trisulphonic acid, 3-amino-4- methoxybenzenesulphonic, sulphonic acid and 1-aminobenzene-2,5-disulphonic acid.  
  The residue B of formula l may for example be derived from the following amines: aminobenzene. lamino2- or -3-methylbenzene, l-amino-2,5- or -2,6- dimethylbenzene. l-amino-Z-or -3-methoxybenzene, l-amino-Z-ethoxybenzene. l-amino-2-B-hydroxyethoxybenzene, l-amino-Z-B-methoxyethoxy-S- methylbenzene, l-amino-3-acetylaminobenzene, lamino-3-n-butyrylaminobenzene, l-amino-3- SOH l-aminobenzene-2- l-amino-3- l-amino-3-acetylamino-6- l-amino-3-propionylamino-6- l-amino-3-n-butyrylamino-6- l-amin0-3-isobutyrylamino-6- l-amino-Z-acetylamino-S- propionylaminobenzene, isobutyrylaminobenzene, methylbenzene, methylbenzene, methylbenzene, methylbenzene,  
 methylbenzene, l-amino-2-propionylamino-5- methylbenzene, l-amino-2-propi0nylamino-5- methylbenzene, l-amino-2-n-butyrylamino-S- methylbenzene, l-amino-2-isobutyrylamino-S methylbenzene, l-amino-2-methoxy-5methylbenzene,  
 l-amino-2-methyl-5-methoxybenzene, l-amino-3- chlorobenzene, I-amino-2-chloro-5-methoxybenzene,  
 l-amino-2-methoxy-S-chlorobenzene, l-amino-3- glutaroylaminobenzene, l-amino-3- succinoylaminobenzene, l-amino-3- fumaroylaminobenzene, l-amino-2,5-  
 dimethoxybenzene, l-amino-2,S-diethoxybenzene, lamino-Z,S-diacetylaminobenzene, laminonaphthalene, Z-aminonaphthalene-7-sulphonic acid, l-aminobenzene, 2,5-dioxyacetic acid, l-amino- Z-methoxy-S-phenoxybenzene and N-3-amino-4- methylphenyl-urea.  
  The trisazo dyestuffs of formula l include dyestuffs of formula wherein R, denotes a hydrogen. or a chlorine atom, or an acetylamino group, R denotes a hydrogen or a chlorine atom or a methyl or propionylamine or a B-carboxypropionylamino group, R denotes a hydrogen atom, or a methoxy or ,B-hydroxyethoxy group, D, denotes a phenylene, naphthylene, toluylene, anisoylene, chlorophenylene, or triazolylene residue, E, denotes a phenylene residue and G, denotes a hydrogen atom or a methyl group, the residues D, and E,-OG, being different from one another, the residue OG, being bound to E, in 2- or 4-position with relation to the azo group, NH-CO being bound to D, in nonadjacent position with relation to the azo group and NHCO- being bound to E, in 3-position with relation to the azo group.  
  Preferred yellow dyestuffs for example correspond to the formula I) so H 4 I l wherein R denotes a chlorine atom or a methyl group, (7) XCO--D-N=N-E--CO-X R denotes a methoxy or hydroxyethoxy group, R de- 6 notes a hydrogen atom or a methoxy group, the residues of formulae wherein X denotes a halogen atom and D, E and G have the above significance.  
 The residues D and D may for example be derived H) O CH from the following diazo components: and n-l 3 2--n 3-aminobenzene-l-carboxylic acid,4-aminobenzene-lcarboxylic acid, 4-amino-3-methylbenzene-ll carboxylic acid, 3-amino-4-methylbenzenel 3 1 2 carboxylic acid, 3-amino-4-methoxybenzenel carboxylic acid, 3-amino-4-chlorobenzenel being different from one another, and n denotes l or 2. 7 carboxylic acid. 5-amino-2-chlorobenzene-l- Amongst these dyestuffs. those of formula carboxylic acid, 4-amino-2-chlorobenzene-l- SO H 0-R )N=t NH -C so 1 H3C 503B 3 n-l 2 n are particularly suitable, wherein R; denotes a methyl carboxylic acid, S-amino-l,2,4-triazole-3-carboxylic or hydroxyethoxy group and n denotes 1 or 2. 40 acid. 4-amino-l-naphthoic acid, 5-amino-l-naphthoic A particularly suitable dyestuff is of formula acid and 5-amino-2-naphthoic acid.  
  The residues E and E may for example be derived 3 from the following coupling components:  
 1-hydroxybenzene-Z-carboxylic acid,  
 N=I\ NH&#34; CO l-hydroxybenzene-3-carboxylic acid,  
 \ l-hydroxybenzene-4-carboxylic acid, l-hydroxy-4- l H C methylbenzene-Z-carboxylic acid, l-hydroxy-5-,  
  H 3 methylbenzene-Z-carboxylic acid, l-hydroxy-6- 3 methylbenzene-Z-carboxylic acid, l-hydr0xy-4- chlorpbenzene-Z-carboxylic acid, l-hydroxy-S- methoxybenzene-Z-carboxylic acid and 5- chlorosalicylic acid.  
  3 0&#34;CH3 The condensation may be effected according tov I known methods and may be advantageously carried out @nhflk NHTCOWT in a polar solvent for example water or especially a H polar organic solvent for example dimethylformamide,  
  l H 3 diethylacetamide or N-methylpyrrolidone. It is also ad- 3 vantageous to carry out the condensation in the pres- O ence of acid-binding reagents for example tertiary Th ll d t ff f f l (1 may all be man, amines or alkali metal carbonates. The condensation factured according to the same processes. An advantamay also be carried out in Solvents which themselves geous process is characterised in that a compound of act as acid&#39;blnding agents for example Py or f l methylpyrrolidone already mentioned.  
 A N=N B NH The aminoazo dyestuffs of formula (6) may be manu- 2 factured according to known methods for example by wherein A and B have the above significance, is concombining a diazo compound of an amine of formula densed with dicarboxylic acid dihalides of formula A-NH wherein A has the significance mentioned, ad  
 vantageously in an acid medium, with a monoamine of formula H-BNH capable of coupling, wherein B has the above significance.  
  The dicarboxylic acid dihalides of formula (7) may be manufactured by diazotisation of an aminobenzene carboxylic or aminonaphthalene carboxylic acid or of an amino triazole carboxylic acid or esters thereof, and coupling with a compound of formula H-E, wherein E has the above-mentioned significance, if desired followed by alkylation of a hydroxyl group in the 0- or pposition in the residue E, and reaction of the azobenzene dicarboxylic acid thus obtained with a halogenating agent, for example phosphorus pentachloride, phosphorus trichloride, thionyl chloride or phosgene, if desired in the presence of an inert solvent with or without the addition of, for example, pyridine or dimethyl-,  
 formamide as catalyst.  
  Another process for the manufacture of trisazo dyestuffs of formula (1) is characterised in that a diazonium compound of an amine of formula wherein A and B have the significance mentioned above is coupled with a compound of formula (9) CO-Nl-l-Bh=N A wherein A, B and E have the significance mentioned above and G represents a hydrogen atom.  
  The diazonium compounds of the amines of formula (8) can be obtained in various ways. Either a carboxylic acid halide&#39;of formula wherein X has the significance already mentioned, is  
 condensed with a compound of formula (6), the nitro group reduced to the amino group and diazotised, or a carboxylic acid halide of formula wherein X has the significance already mentioned and Y represents the residue NH-Z or -N=Z, wherein Z represents a removable protective group. is condensed with a compound of formula (6) the protective grou&#39;p split off and the amino group diazotised. Suitable protective groups are for example phthaloyl, carbalkoxy, carbophenyloxy, carbobenzoxy or triphenylmethyl groups.  
  The compounds of formula (Il) may be advantageously manufactured by reacting the derivatives of the aminocarboxylic acids with the dicarboxylic acid anhydrides or the reactive halogen compounds of the protective groups in an aqueousalkaline medium or in an inert solvent. if desired in the presence of compounds which add hydrogen halides for example pyridine or triethylamine. After saponification and conversion to the carboxylic acid halide, preferably the chloride or bromide, the reaction with an aminoazo dyestuff of formula (6) is then carried out in the usual manner. The manufacture of products having protective groups and the splitting off of the protective groups under the ap&#39; propriate conditions are known from protein chemistry.  
  As examples of compounds from which suitable carboxylic acids and their derivatives may be derived. the compounds of the following formulae for example may be mentioned:  
 coon coon COOH coon COOH N02 N02 N02 I CH3 I N02 (:1 N0  
 cooa  
  2 oca The trisazo dyestuffs of formula (I) can be used for various purposes, for example in the production of photographic materials and particularly advantageously as image dyestuffs for the silver dyestuff bleaching process. Valuable photographic materials which contain at least one layer having a dyestuff of formula (1) on a support can accordingly be manufactured in the usual manner by known methods.  
  In particular, the trisazo dyestuffs may be present in a multi-layer material which on a layer support contains a layer which is dyed with a greenish-blue dyestuff and is selectively sensitive to red, over this a magentacoloured layer which is selectively sensitive to green and finally a yellow-coloured layer which is selectively sensitive to blue.  
  The trisazo dyestuffs of formula (1) can be used in the various layers.  
  The dyestuffs of formulae (2), (3), (4) and (5) are particularly suitable for the layer which is sensitive to blue in a silver dyestuff bleaching process.  
  The dyestuffs of formula (I) may also be incorporated into an auxiliary layer or especially into a layer adjacent to the light-sensitive layer.  
  .The dyestuffs of formula (I) are very diffusionresistant in the usual layers. They do not tend to change to an opalescent to cloudy form in gelatine layers on drying and storage. and they can be readily reduced in the bleaching bath to form harmless and/or easily washed-out decomposition products.  
  The dyestuffs of formula l are distinguished by particularly high colour strength and purity of shade. Grey shades which appear neutral to the eye over the entire density range can be produced with them, for example by combining a yellow dyestuff of formula (4) or (5) with one each of a suitable magneta and cyan dyestuff.  
  Compared to other trisazo dyestuffs, the dyestuffs of formula (1) are quite exceptionally distinguished by their good solubility and compatibility with cations, es-  
  7 8 pecially calcium ions. They are nevertheless extraordioff and the mixture is slowly allowed to cool to room narily diffusion-resistant over a pH range of -1 1. temperature. The yellow crystals which have separated In many cases it is particularly difficult to displace are filtered and washed with 2.00 ml of N- the absorption of yellow dyestuffs by small amounts. methylpyrrolidone. The residue is boiled with 50 ml of for example ynm towards ng r gh r to 5 methanol for one hour whilst stirring, filtered and flatten an excessively steep flank of the absorption washed three times with 2.50 ml of methanol each curve, particularly in the irection of long r wavetime. The residue is then boiled for one hour with 40 lengths, as can under certain circumstances be desirel f h l d 6,00 l of potassium acetate able to Produc:e a neutral y h when PP P solution whilst stirring. filtered hot, rinsed four times ately combining all three dyestuffs, over all density 10 i h 4 l f h l h i d d i d at 60 ranges. C in vacuo. 4.75 g of the dyestuff A of formula 3 OCH The present invention therefore also provides photoare obtained. graphic material, especially for the silver dyestuff bleaching process, which contains on a support, at least EXAMPLE 2 one layer having a dyestuff of one of formulae l to 2.1. p-Aminobenzoic acid ethyl ester is diazotised in (5). the usual manner and coupled with p-hydroxybenzoic Percentages given in the manufacturing examples acid methyl ester. A yellow dyestuff of melting point which follow are percentages by weight. 123 C is obtained. The hydroxyl group of this dyestuff is methylated in the usual manner with dimethyl sulphate in acetone in the presence of potassium hydrox- EXAMPLE 1 ide. The methylation product has a melting point of 153 C after recrystallisation from 100 acetic acid.  
 1.1.. 2-Aminonaphthalene-4.8-disu1phonic acid is The ester groups are saponified with sodium hydroxide diazotised in the usual manner and coupled with 2- and the saponification product is crystallised from dimethoxy-S-methylaniline. methylformamide. The acid has a melting point of 305 1.2. p-Aminobenzoic acid ethyl ester is diazotised in t 308 C,  
 the usual manner and coupled with salicylic acid 4 g of this acid are suspended in 6.7 ml of toluene.  
 methyl ester. A yellow azo dyestuff is obtained which and after adding 3 drops of dimethylformamide are melts at 151 C after recrystallisation from acetone. mix d with 4 g of thionyl chloride. The reaction mix- The hydroxyl group of this dye-stuff is methylated in ture is then warmed to 100 C whilst stirring. After 10 the usual manner with dimethyl sulphate in acetone in minutes all the material dissolves. The mixture is the presence of potassium hydroxide- The resulting heated for a further 20 minutes to 100 to 105 C. a furmethylation product melts at 140 C. 4- ther 6.7 ml of toluene are added and the mixture is al- Methoxyazobenzene-3.4&#39;-dicarboxylic acid of melting lowed to cool slowly. The product is filtered, washed point 275 to 278 C is obtained by saponification of with 20 ml of petroleum ether and crystallised from 30 the two ester groups. m1 of benzene. 3 g of the acid chloride of melting point 400 g of this acid are dissolved in 400 ml of toluene 120 C are obtained. and 63 ml of dimethylformamide at 80 C. miXed at 2.2. 5.4 g of the yellow dyestuff manufactured acroom temperature with 245 ml of thionyl chloride. and cording to 1.1. are dissolved in 44 ml of N- the temperature is raised to C in 1 hour- The mi -methylpyrrolidone at 120C. The solution is allowed to ture is stirred for a further two hours at 90 C, filtered cool to 80 C a d 1.5 ml of pyridine and added. 2.5 g hot and the filtrate slowly allowed to cool to 0 C. The of the product according to 2.1. are then introduced mixture is filtered and the residue washed three times with d ti i Th ddi i f h id hl id with 300 ml of petroleum ether each time. cording to 2.1. is continjed until no dyestuff 1.1. can be 430 g of yoellow needles of melting point 138 C are detected chromatographically in the reaction mixture. obtained. The clear reaction solution is mixed with 150 ml of ace- 1.3. 5.40 g of the product manufactured according to tone, filtered. and the residue washed with 50 ml of ac- 1.1. are dissolved in 44 ml of N-methylpyrrolidone at etone. The residue is boiled with 50 m1 of methanol for 120 C. The mixture is then cooled to 80 C, 1.50 ml one hour whilst stirring, filtered hot and washed three of dry pyridine are added and 2.50 g of the product times with 20 ml of methanol each time. The residue is manufactured according to 1.2. are introduced whilst boiled for one hour with 40 m1 of methanol and 6 ml stirring. The addition of the product according to 1.2. of 20 alcoholic potassium a tat l ti fil d is continued until no further product according to 1.1. hot and washed dour times with 10 ml of methanol can be detected chromatographically in the reaction each ti mixture. The stirrer and the heating are then switched 2.7 g of the yellow dyest ff B f f l so, 301 J 1 SO.l\ 3  
  \=N -NHCO- N=N I 3 so K 3 L on are 0btained- 15 are obtained.  
 EXAMPLE 3 EXAMPLE 4 3.1. 2-Methoxyaniline-5-carboxylic acid methyl ester is diazotised in the usual manner and coupled with salicylic acid methyl ester. The resulting dyestuff is methylated with dimethyl sulphate in known manner in acetone in the presence of potassium hydroxide and the two carboxyl groups are then saponified.  
  3.3 g of the resulting dyestuff are suspended in 20 ml of benzene and mixed with 5 g of phosphorus pentachloride. The mixture is heated to 80 C for one hour, allowed to cool to room temperature, and the resulting yellow crystals are filtered. washed with 3 ml of benzene and 20 ml of petroleum ether.  
 Yield 2.1 g; melting point: 165 C.  
  3.2. 8 g of the product manufactured according to 1.1. are dissolved in 60 ml of N-methylpyrrolidone and 10 ml of pyridine at 120 C and then mixed at 80 C with 4 g of the product manufactured according to 3.1. The addition of the product according to 3.1. is continued until no product manufactured according to 1.1. can be detected chromatographically in the reaction 4.1. 2-Aminonaphthalene-4.8-disulphonic acid is diazotised in the usual manner and coupled with Z-B- hydroxyethoxy-S-methylaniline.  
  4.2. 5.5 g of the dyestuff manufactured according to 4.1. are dissolved in 44 ml of N-methylpyrrolidone at 120 C, mixed with 1.5 ml of pyridine, and 2.5 g of the product according to 1.2. are introduced into this solution at 80 C. The addition of product according to 1.2. is continued until no product according to 4.1. can be detected chromatographically in the reaction solution. The mixture is then allowed to cool slowly to room temperature and the product is filtered, rinsed with 10 ml of N-methylpyrrolidone and the residue boiled with 50 ml of alcohol for one hour whilst stirring. It is then filtered and the residue washed three times with 25 ml of alcohol each time. The residue is again boiled for one hour with ml of methanol with the addition of 6 ml of 20 7t potassium acetate solution, filtered and washed three times with 10 ml of methanol each time.  
 4.6 g of the yellow dyestuff D of formula solution. The reaction solution is then mixed with 300 are obtained.  
 ml of acetone. and the product is filtered and washed three times with 50 ml of acetone each time. The residue is boiled with 100 ml of methanol and 10 ml of a 20% solution of potassium acetate in methyl alcohol for oca ca oa 3. i con-11% CH3 I K EXAMPLE 5 5.l. 2-Aminonaphthalene-4,8-disulphonic acid is diazotised in the usual manner and coupled with 3-none hour, filtered and washed three times with 50 ml propionylaminoaniline.  
 of methanol each time.  
 6 g of the yellow dyestuffC of formula 5.2. 1.0 g of the dyestuff according to 5.1. is dissolved in 20 ml of N-methylpyrrolidone at room temperature 1 l 12 and 0.35 g of the product according to 1.2. are intro- 75 ml of petroleum ether and immediately further produced into this solution. The addition of product accessed. cording to 1.2. is continued until no product according 7,3. 7 g of the dyestuff manufactured according to to 5.1. can be detected chromatographically in the re- 7,] ar dissolved in 70 ml of N-methylpyrrolidone and action solution. The dyestuff formed is precipitated by 7 ml of pyridine at 70 C and the acid chloride obtained adding 200 ml of acetone, filtered, the residue disfrom 7.2. is slowly added at this temperature, the prosolved in 50 ml of water and the dyestuff precipitated gressive condensation being checked during the addiwith potassium acetate, filtered and washed three times tion by the disappearance of the amino group which is with 5 ml of methanol each time. recognisable by diazotisation and coupling in a spot 0.6 g of the yellow dyestuff E of formula test. When no further amino group can be detected, the  
  3 COCH CH I NI\ NH-CO-ON@ 0011 NH SOK 3 L) CO-NH N=1\ j S K C(.)CH Cl-I I is obtained. reaction solution is stirred into 200 ml of acetone and EXAMPLE 6 the dyestuff which has separated is filtered and twice washed with 100 ml of acetone each time. 6.1. 2-Aminonaphthalene-4,8-disulphonic acid is The residue is boiled with 50 ml of methanol and 5 diazotised in the usual manner and coupled with ml ofa &#34;/1 solution of potassium acetate in methyl al- 5-chloro-2-methoxyaniline. cohol for 10 minutes. filtered and washed three times 6.2. A procedure analogous to 5.2 is followed and 0.6 with ml of methanol at 60 C. g of the yellow dyestuff F of formula 5 g of dyestuff G of formula K0 8 OCH N=N- i NH-co-@ N-=i\ 0011 (jg L 3 Cl 803k g (11 co-1\ N= CH O (1.7) K0 5 is obtained.  
  OCl-l K035 3 C 3 co-ua --N=N $03K oca l (18) 3 are obtained.  
 &#39; 7.1. 2-Aminonaphthalene-4,8-disulphonic acid is 8.1. 2-Aminonaphthalene-4,8-disulphonic acid is diazotised in the usual manner and coupled with 2- diazotised in the usual manner and coupled with 3- methoxy-S-methylaniline. succinylaminoaniline.  
  7.2. p-Aminobenzoic acid is diazotised in the usual 3 g of finely P e dyestuff HCCOrdiflg t0 8.1- manner and coupled with salicylic acid. are suspended in ml of N-methylpyrrolidone and 5 44.8 g of the resulting dyestuff are suspended in 90 ml of Py and this suspension is mixed at C ml of benzene, and mixed with 58 ml of thionyl chlo- 60 with 2 g of 4-meth0Xyaz0benzene-3,4-diearboxylie ride and 1 1.2 ml of dimethylformamide. The mixture is acid dichloride (m nufactured according to example heated to 55 to 60 C for one hour; a clear soluti i 1.2.). Acid chloride is added until no further amino produced. This is allowed to cool and hydrochloric acid g p is detectable f r i z is i n n pling in gas and sulphur dioxide are removed from the reaction a spot test. The reaction solution is stirred into 300 ml solution by pumping the reaction vessel to 16 mm Hg of acetone. and the dyestuff which has separated out is for one hour. The residue is stirred with a mixture of 30 filtered and washed three times with 50 ml of acetone ml of benzene and ml of petroleum ether, filtered, each time. The residue is suspended in ml of methpressed, washed with a mixture of 25 ml of benzene and anol; 2.5 ml of a 20% solution of potassium acetate in methyl alcohol are then added, the mixture is boiled for minutes, the product is filtered hot and washed three times with 50 ml of methanol each time at 60 C.  
 1.6 g of the dyestuff H of formula I 3 coca ca 00011 are obtained.  
 EXAMPLE 9 9.1. Z-Methoxyaniline-S-sulphonic acid is diazotised 20 in known manner and coupled with 2-methoxy-5- methylaniline.  
  9.2. 6 g of the dyestuff according to 9.1. in 60 ml of N-methylpyrrolidone and 3 ml of pyridine are heated to 80 C and mixed with 2 g of 4-methoxyazobenzene- 3,4-dicarboxylic acid dichloride (manufactured according to example 1.2.). Acid chloride is added until no further amino group is detectable by diazotisation and coupling in a spot test.  
 The reaction solution is stirred into 300 ml of ace- 3 tone and the dyestuff is filtered and washed three times with ml of acetone each time.  
 uwco-Oam-Ckwmg diazotised in the usual manner and coupled with laminonaphthalene.  
 SOK  
  I CO-CH CH COOH 10.2. 6 g of the dyestuff according to 10.1. are suspended in 100 ml of methylpyrrolidone and 6 ml of pyridine, heated to C and mixed with 2 g of 4- methoxyazobenzene-3,4-dicarboxylic acid dichloride (manufactured according to example 1.2.). Acid chloride is added until no further amino group is detectable by diazotisation and coupling in a spot test. The reaction solution is stirred into 800 ml of isopropanol and the product is filtered, washed with 300 ml of isopropanol and twice with ml of alcohol.  
  The residue is suspended in 100 ml of methanol, mixed with 20 ml of a 20 7: solution of potassium acetate in methyl alcohol, the solution boiled for 15 minutes. the product is filtered hot and washed with 100 ml of methyl alcohol.  
 4.8 g of the dyestuff J of formula are obtained.  
 EXAMPLE 11 11.1. 2-Amin0naphthalene-4,8-disulphonic acid is 50 diazotised in the usual manner and coupled with 2 methoxy-S-methylaniline.  
  0011 0011 iPneu-G- NH-CO-ON=NQ 0on CH3 3 on com N= so K 3 OCH 1 3 so K are obtained.  
 l 1.2. p-Aminobenzoic acid ethal ester is diazotised in the usual manner and coupled with hydroxynaphthalene-2-carboxylic acid methyl ester.  
  A yellow dyestuff of melting point 181 C is obtained. 11.3. 2.6 g of the dyestuff 1 1.2. are introduced into a mixture of 80 ml of acetone and 2.8 g of powdered potassium hydroxide. the mixture is heated to 50 C for 30 minutes. and 4.8 ml of dimethyl sulphate are then added during 15 minutes. The mixture is boiled for 3 hours, poured on to 100 g of ice, mixed with 50 ml of 257( ammonia. filtered, and the residue washed with water.  
  2.2 g of crude product are obtained and this is recrystallised from 600 ml of alcohol and l g of charcoal. The resulting dyestuff has the formula (22) and melts at 138 C.  
 COOCH 11.4. 38 g of the dyestuff according to 11.3. are boiled for 10 minutes in 200 ml of isopropanol with the addition of 30 ml of 10 N sodium hydroxide solution. The reaction solution is mixed with 1.000 ml of water, rendered acid to Congo Red with hydrochloric acid.  
 cooled to C, filtered, and the residue washed with water. After drying in vacuo at 100 C the reaction product is recrystallised from dimethylformamide. Yield of compound of formula (27 21 g, melting point 246C.  
 COOH  
  1 1.6 5 g of the dyestuff manufactured according to 1 1.1. in 50 ml of methylpyrrolidone and 5 ml of pyridine are heated to 80 C and mixed at this temperature with 3 g of the acid chloride according to l 1.5. The addition of acid chloride is continued until no further amino group is detectable by diazotisation and coupling in a spot test. The reaction solution is then cooled to 20 C, stirred into 250 m1 of acetone, filtered and the residue washed with 200 ml of acetone. The residue is taken up in 100 ml of methyl alcohol, mixed with 25 ml ofa 20 7c solution of potassium acetate in methyl alco- COCl OCH  
 hol. boiled for 15 minutes. filtered hot and washed with 100 m1 of methyl alcohol.  
 5.2 g of the dyestuff K of formula OCH SO K  
 EXAMPLE 12 12. 1. 2-Amino-o-acetylaminonaphthalene-4,8- disulphonic acid is diazotised in the usual manner and coupled with 3-succinylaminoaniline.  
  12.2. 3 g of finely powdered dyestuff according to 12.1. are suspended in 60 m1 of N-methylpyrrolidone and 5 ml of pyridine and this suspension is mixed at 80 C with 2 g of 4-methoxyazobenzene-3,4&#39;-dicarboxylic acid dichloride. Acid chloride is added until no further amino group is detectable by diazotisation and coupling in a spot test. The reaction solution is stirred into 300 m1 of acetone, filtered and the product washed three times with 50 ml of acetone each time. The residue is suspended in 100 ml of methanol, mixed with 2.5 m1 ofa 20% solution of potassium acetate in methyl alcohol, boiled for 15 minutes, filtered hot and washed three times with 50 m1 of methanol at 60 C each time.  
 are obtained.  
 4O 2 g of the dyestuff offormula 30 K UyNfll-O-Nll-CRCM Q NH 1 l I K I (26) co S 3 co I CH CH CH COOH S0 K =1\ 0on 3 NH CO-I\HO--N= I NH CH O-CH CH COOH are obtained.  
  EXAMPLE 13 13.1. 67 g of S-amino-l.2,4-triazole-3-carboxylic acid are suspended in 300 ml of acetic acid/propionic acid 1:1. 200 ml of 37 7I hydrochloric acid are added thereto, the mixture is cooled to C and 130 ml of 4N sodium nitrite solution are added in several poritions. Diazotisation is carried out for one hour at 0 C.  
  The diazonium salt solution is poured into 80ml of salicylic acid methyl ester which have been diluted with 100 ml of methanol. The pH value is raised from 3 to 9 by dropwise addition of 650 ml of 30% sodium hy-.  
 droxide solution. The mixture is stirred for 24 hours at 0 to C. The intensely red-coloured suspension is heated to 50 C, filtered, and the residue is recrystallised from 8,000 ml of water.  
 Yield 71 g 48.8 &#34;/1 of a yellow powder which decomposes above 260 C and corresponds to the formula (27) i 1-N I ll COOCl-l COOH  13.3. 3.8 g of the intermediate product of formula (28 in 50 ml of thionyl chloride and 1 ml of dimethylformamide are stirred for 1 hour at 50 to 55 C. Thereafter the excess thionyl chloride is evaporated in vacuo at 50 C. The acid chloride is then further processed for the manufacture of the required dyestuff.  
  13.4. 7 g of the coupling product from diazotised 2- aminonaphthalene-4,8-disulphonic acid and methoxy-S-methylaniline are dissolved in 150 m1 of N- methylpyrrolidone and directly added to the acid chlo-&#39; ride of 13.3. After 12 hours stirring at room temperature the mixture is warmed to 60 C for 30 minutes and the dyestuff is precipitated by adding 500 ml of acetone. The precipitated dyestuff is filtered, the residue is dissolved in 30 ml of water. diluted with 300 ml of methanol, and 5 ml of 7 N potassium acetate solution are added. The product is filtered and dried in vacuo at 50 C.  
 Yield 1.1 g of the orange dyestuff M of formula 18 EXAMPLE 14 14.1. 12.8 g of the intermediate product of formula (27) (91 7t content) are suspended in 100 ml of dimethylformamide; 35g of powdered potassium carbonate are then added. followed after half an hour by 19 ml ofdimethyl sulphate 26 g). Foaming immediately starts with a slight rise in temperature. Thereafter the mixture is heated to 60 70 C for 5 minutes. and 100 ml of water and 2 N hydrochloric acid to give a pH of 7 are added to destroy the excess dimethyl sulphate. The reaction mixture if kept for 5 minutes at 70 C and concentrated until a thick crystal sludge is obtained which is filtered, washed with ml of methanol and dried in vacuo at 50 C.  
 Yield 4.5 g.  
  The product is purified by recrystallization from 50 ml of ethanol and 3.5 g ofa yellow product of melting point 152 to 165 C of the formula n H CH DOC-C CN= OCH COOCH are obtained.  
  14.2 3.2 g of the intermediate product of formula (30) in 40 ml of 1 N sodium hydroxide solution are heated to 90 C for 45 minutes. The mixture is then neutralised with 2 N hydrochloric acid and the precipitate is filtered. It is dried in vacuo at 50 C.  
 Yield 1.4 g of a yellow powder which decomposes (31) in 30 ml of thionyl chloride and 1 ml of dimethylformamide are stirred for minutes at 50 to 55 C.  
 The mixture is heated to reflux temperature for a short time and the excess thionyl chloride is evaporated in vacuo. The resulting acid chloride is then further processed as follows.  
  14.4. 3.0 g of the coupling product from diazotised 2-aminonaphthalene-4,8-disulphonic acid and 2- methoxy-S-methylaniline are dissolved &#39;in 50 ml of N- methylpyrrolidone and directly added to the acid chloride of 14.3. After 12 hours stirring the mixture is heated to 50 C, kept for 30 minutes at this temperature and then filtered, and the filtrate is precipitated by adding 500 ml of acetone. The mixture is filtered, the residue is dissolved in 30 ml of hot water and diluted OH N n NHCO C\\N c N NQ I 0011 $03K A oca com N= 03K I with 300 ml of ethanol, and ml of 7 N potassium acetate solution are added. The product is filtered and dried in vacuo at 50 C.  
 Yield 0.8 g of the yellow dyestuff N of the formula In accordance with Example 1 the dyestuffs O and P of the following formulae are prepared: Dyestuff O of the formula CH 503K 3 N= -c0- c1 0on N= (33) 803K 0on ca 803K Dyestuff P of the formula CH 503K 3 fijj-wnb mi-co-Qw \OCH ca (34) 803K 3 3 C 3 803K swim-6 w I OCH oca In accordance with Example 12 the dyestuffs Q, R and S of the following formulae are prepared:  
 s HN  
 &#39; so K co H i 3 9 3* 13 N (35) 33 9 2 I II N= NHCOC\ N 10 OH N =N u 803K 3 CH3 803K GOO-5% N= I 15 CH oca 9 I ocH 3 803K CH2 803K ca 0 CH2 3 20 0H OCH 3 so K 3 Dystuff R of the formula N= NH-COO-N (:1 \)CH3 CH3 (36) so 1 3 803K comm-pm CH3 I 0 01 Dyestuff S of the.formula CH 803K 3 =N\ 4% NH-COO-N 01 CH 3 i 2 7 0H =N ca -CO- N= 5on o 1 I CH2 803K 9 Absorption maxima Dyestuff in nm EXAMPLE 15 The following layers are successively applied to an 7 opaque white acetate film provided with an adhesive layer:  
  l. Silver bromide emulsion in gelatine, sensitive to red, containing the cyan dyestuff of formula 2. Colourless gelatine layer without silver halide. 3. Silver bromide emulsion in gelatine, sensitive to green. containing the magenta dyestuff of formula )C l -NHCO-HN 50 N:  
  HZN 0.00  
 so H  
  80 R 4. Yellow filter layer containing the dyestuff of formula c1 0 OQE @4112 =N S H 3&#34; 5. Silver bromide emulsion in gelatine, sensitive to blue. containing the yellow dyestuff A of formula 12).  
  The gelatine layers can also contain additives for example wetting agents, hardeners and stabilisers for the silver halide. In other respects the procedure followed is such that the individual layers contain 0.5 g of the particular dyestuff and an amount of silver bromide corresponding to 1 to 1.2 g of silver per square metre of film.  
 This film is exposed to red, green and blue copying light under a coloured diapositive. Thereafter the copy is developed in accordance with the following instructions:  
  1. 6 Minutes development in a bath which in one litre of water contains g of anhydrous sodium sulphate, 0.2 g of l-phenyl-3-pyrazolidone, 6 g of hydroquinone, 35 g of anhydrous sodium carbonate, 4 g of potassium bromide and 0.3 g of benztriazole;  
 2. 5 minutes soaking;  
  3. 6 minutes fixing in a solution of 200 g of crystalline sodium thiosulphate and 20 g of potassium metabisulphite in 1 litre of water;  
 4. 5 minutes soaking;  
  5. 3 to l2 minutes colour bleaching with a solution which in one litre of water contains 50 to 80 g of potassium bromide, 40 to 80 g of thiourea, 35 to 80 g of 30% sulphuric acid and if desired 0.01 g of 2-amino-3- oxyphenazine;  
 6. 10 minutes soaking;  
  7. 5 minutes bleaching of residual silver with a solution of g of crystalline copper sulphate. g of potassium bromide and 15 ml of 30% hydrochloric acid per litre of water;  
 8. 5 minutes soaking;  
 9. 5 minutes fixing as specified under 3;  
 l0. 5 minutes soaking.  
  The resulting positive image for viewing in reflected light is fast to slight and of the permanence required for documents.  
  Instead of dyestuff A, dyestuffs B to S can also be used with equally good results.  
 We claim:  
  1. Photographic material for the silver dyestuff bleaching process that contains on a support at least one silver halide emulsion layer and in at least one layer a trisazo dyestuff of the formula wherein each A denotes a benzene or naphthalene resi-&#39; due which is unsubstituted or substituted by a halogen 23 24 atom or an alkyl, alkoxy, nitro or acetylamino group B-carboxypropionylamino group, R denotes a hydroand contains 1 to 3 sulphonic acid groups, each B degen atom or a methoxy or B-hydroxyethoxy group D notes a benzene residue which is unsubstituted or subdenotes a phenylene. naphthylene, toluylene, anisoystituted by at most 2 halogen atoms, or alkyl, alkoxy, lene, chlorophenylene or triazolylene residue, E, de-  
 hydroxyalkoxy, alkoxyalkoxy, acylamino, carbox- 5 notes a phenylene. residue and G, denotes a hydrogen yacylamino, carboxyalkyl, carboxy or phenoxy groups atom or a methyl group, the residues D, and E -OG,  
 or denotes a naphthalene residue, and wherein D debeing different from one another, -OG being notes a benzene or naphthalene residue or a triazole bound to E in 2- or 4-position with relation to the azo residue, E denotes a benzene residue and G denotes a group, NHCO being bound to D, in nonhydrogen atom or an alkyl group containing 1 to 5 carl adjacent position with relation to the azo group and l bon atoms, D and E each are unsubstituted or substi- -NHCO being bound to E in 3-position with relatuted by a halogen atom or an alkyl, alkoxy or phenyl tion to the azo group. 4 group, the residues D and E O-G being different 3. Photographic material according to claim 1 that from one another being bound t0 E in 0f contains on a support at least one layer containing a position with relation to the azo group, AN= trisazo dyestuff of the formula NBNHCO being bound to D in non-adjacent wherein R denotes a chlorine atom or a methyl group, position with relation to the azo group and R denotes a methoxy or hydroxyethoxy group, R debeing bound to E i 3- notes a hydrogen atom or a methoxy group, the resiposition with relation to the azo group. dues of formulae 2. Photographic material according to claim 1 that contains on a support at least one layer containing a trisazo dyestuff of the formula SO H  being different from one another, and n denotes 1 or 2. wherein R denotes a hydrogen or a chlorine atom, or 4. Photographic material according to claim 1 that an acetylamino group. R denotes a hydrogen orachlocontains on a support at least one layer Containing a rine atom or a methyl or propionylamino group or a iriSflZO y ff 0f the rmu a =1 -NH-C H c S0311 3 H N SO3H (H) -0-CH N: NH n-l 3 2-n where R; denotes a methyl or hydroxyethoxy group and n denotes I or 2.  
  S. Photographic material according to claim 1 that contains on a support the trisazo dyestuff of the formula so H 3 -N=t\ NH-C0 H c 3 s0 N $0 11 O-CH3 WQNHO 1 11- c 3 O-CH so H 3