US3667957A - Photographic material with a stabilizer antifoggant bidentate compound - Google Patents

Photographic material with a stabilizer antifoggant bidentate compound Download PDF

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US3667957A
US3667957A US799097A US3667957DA US3667957A US 3667957 A US3667957 A US 3667957A US 799097 A US799097 A US 799097A US 3667957D A US3667957D A US 3667957DA US 3667957 A US3667957 A US 3667957A
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Jozef Frans Willems
Frans Clement Heugebaert
Robert Joseph Pollet
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Agfa Gevaert NV
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
    • C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
    • C07D249/08—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
    • C07D249/10—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D249/12—Oxygen or sulfur atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
    • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
    • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
    • C07D235/06—Benzimidazoles; Hydrogenated benzimidazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
    • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
    • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
    • C07D235/18—Benzimidazoles; Hydrogenated benzimidazoles with aryl radicals directly attached in position 2
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
    • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
    • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
    • C07D235/24—Benzimidazoles; Hydrogenated benzimidazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2
    • C07D235/28—Sulfur atoms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
    • G03C1/346—Organic derivatives of bivalent sulfur, selenium or tellurium

Definitions

  • A stands for alkylene which may be interrupted by one or more hetero atoms, S-alkylene which may be interrupted by one or more hetero atoms, or arylene,
  • X stands for alkyl, alkenyl or aryl, or
  • a and X together represent the atoms necessary to complete a saturated heterocycle
  • the said compound comprising directly or indirectly linked to the group Z and/or X a -COOM or --SO M group wherein M is hydrogen, ammonium, a metal atom or organic ammonium.
  • Fogging in general and chemical fogging in particular may be defined as the formation of a uniform deposit of silver on development which is dependent on a whole series of circumstances and factors namely on the nature of the emulsions, on their age, on the conditions under which they have been stored, on the development conditions, etc.
  • the fog tends to be greater as the time of storage and the temperature and relative humidity of the atmosphere in which the emulsions are stored are increased. Consequently it is known to carry out accelerated tests called incubation tests on the stability of photographic emulsions by storing them at elevated temperature and humidity and then determining their sensitometric characteristics.
  • Addenda to the photographic material known as stabilizers or antifoggants protect the light-sensitive silver halide emulsions against formation and growth of fog particularly in high sensitive emulsions and in emulsions which are to be stored under conditions of high temperature and humidity as is for instance the case in tropical countries.
  • Q stands for a sulphur atom or selenium atom
  • A stands for alkylene such as methylene, ethylene, trimethylene, etc. including substituted alkylene and alkylene interrupted by one or more hetero atoms, -S-alkylene including substituted S-alkylene and S-alkylene interrupted by one or more hetero atoms or arylene including substituted arylene,
  • X stands for alkyl including substituted alkyl, alkenyl including substituted alkenyl or aryl including substituted aryl, or
  • a and X together represent the atoms necessary to complete a saturated heterocycle including a substituted heterocycle
  • the compounds corresponding to the above general formula are bidentate ligands forming complexes with silver i.e. they contain two coordinating atoms for silver, the nitrogen atom of the NH- moiety of the heterocycle being one of the coordinating atoms and the Q-atom i.e. sulphur or selenium being the other coordinating atom.
  • the said NH moiety and the Q-atoms, their relative positions in the molecule and also the presence of the water-solubilizing group(s) are essential features of the compounds according to the invention for use as stabilizers. Indeed, compounds corresponding to the above general formula but containing no water-solubilizing groups possess not at all interesting properties as stabilizers.
  • compounds of similar structure but containing a substituent on the --NH-- moiety of the heterocycle have a less good stabilizing effect.
  • closely similar compounds differing from the compounds of the invention only in that the group QX is directly linked to the heterocycle i.e. compounds wherein A is a chemical bond have no stabilizing action at all, owing to the fact that in that case the sulphur or selenium atom loses its coordinating action with regard to silver because when directly linked to the heterocycle the unshared electron pairs on the sulphur or selenium atom (Q) are interacting with the delocalized or spread 1r-Cl6Ctl'OnS of the strongly electron withdrawing heterocycle i.e. they are held in common by the whole of the conjugate system.
  • Preparation 3 Compound 3 94 g. of 3,4-diaminobenzenesulphonic acid and 67 g. of 'y-methylthiobutyric acid were refluxed for 12 hours in 750 ml. of 6 N hydrochloric acid. The solution was filtered over decolourising carbon, the hydrochloric acid was evaporated and the residue 'was recrystallized from water. 25 g. of 2-(3-methylthiopropyl-5(6)-sulphobenzimidazole were obtained.
  • Preparation 4 Compound 4 56.8 g. of 3,4-diaminobenzoic acid hydrochloride and 31.8 g. of methylthioacetic acid were refluxed for 8 hours in 420 ml. of 6 N hydrochloric acid. Upon cooling the crude benzimidazole compound crystallized whereupon it was recrystallized from aqueous methanol. 50 g. of 2 methylthiomethyl-S(6)-carboxybenzi.midazole hydrochloride were obtained.
  • Preparation 5 Compound 5 To a solution of 20 g. of 2-mercaptomethylbenzimidazole prepared according to E. S. Milner et al., J1. Chem. Soc. 1964, 4151 and 6.5 g. of sodium methylate in 300 ml. of methanol, 15 g. of propanesultone were added whereupon the whole was refluxed for 2 hours. The solution was filtered over decolourising carbon, the methanol was removed by evaporation, and the residue was taken up in alkali. Then the solution was filtered and acidified whereupon the solid product formed was recrystallized from water. 15 g. of 2-(3-sulphopropylthiomethyl)benzimidazole were obtained.
  • Preparation 6 Compound 6 Preparation 7 :Compound 7 To a solution of 25 g. of 2-mercaptomethylbenzimidazole in 150 ml. of 1 N sodium hydroxide was added at 50 C. a solution of 17.4 g. of sodium chloroacetate in 100 ml. of water. After having been stirred for 30 min. the solution was acidified with acetic acid. The precipitate formed 'Was recrystallized from aqueous ethanol. 16 g. of 2-carboxymethylthiomethylbenzimidazole were obtained.
  • Preparation 8 Compound 8 To a solution of 8.2 g. of 2-mercaptomethylbenzimidazole and 2.7 g. of sodium methylate in 100 ml. of methanol, 6.8 g. of butanesultone were added whereupon the whole was refluxed for 2 hours. The solution was filtered over decolourising carbon, the methanol was removed by evaporation and the residue was taken upon in alkali. The solution was filtered and acidified. By crystallisation from water 4 g. of 2-(4-sulphobutylthiomethyl) benzimidazole were obtained.
  • Preparation 92Compound 9 To a solution of 8.2 g. of 2-mercaptomethylbenzimidazole and 2.7 g. of sodium methyl-ate in 100 ml. of methanol were added 8.2 g. of 1,1,3-trimethylpropanesultone whereupon the whole was refluxed for 2 hours. The solution was filtered over decolourising carbon, the methanol was removed by evaporation and the residue was taken up in alkali. The solution formed was filtered and acidified. By crystallisation from water 3 g. of 2-(1,3- dimethyl-3-sulphobutylthiomethyl)benzimidazole were obtained.
  • Preparation 10 Compound 10 (a) 188 g. of 3,4-diaminobenzenesulphonic acid and 115 g. of mercaptoacetic acid were refluxed for 6 hours in 500 ml. of 6 N hydrochloric acid. The solution was filtered over decolourising carbon, the hydrochloric acid removed by evaporation and the residue taken up in alkali. Then the solution was filtered and acidified whereupon the solid formed was recrystallized from water. 113 g. of 2-mercaptomethyl-5(6)-sulphobenzimidazole were obtained.
  • Preparation 11 Compound 11 (a) 21.6 g. of o-phenylenediamine and 23.8 g. of bis(3- carboxypropyl)disulfide were refluxed for 24 hours in 200 ml. of 6 N hydrochloric acid. The hydrochloric acid was removed by evaporation and the oily residue washed with ammonium hydroxide and water. The oil solidified and was recrystallized from aqueous ethanol. 15 g. of bis[3-(2- benzimidazolyl)propyl]disulphide were obtained.
  • Preparation 12 Compound 12 94 g. of 3,4-diaminobzenesulphonic acid and 84 g. of (phenylthio)acetic acid were refluxed for 12 hours in 2.6 litres of 6 N hydrochloric acid. The solution was filtered over decolourising carbon, the hydrochloric acid was removed by evaporation and the residue recrystallized from methanol. Yield: 69 g. of 2-phenylthiomethyl-5(6)-sulphobenzimidazole.
  • Preparation 13 Compound 13 To a solution fo 54.8 g. of the disodium salt of 2- mercapto-S(6)-sulphobenzimidazole in 250 ml. of dimethyl formamide a solution of 25 g. of 2-chloroethylethioethane in 50 ml. of dimethyl formamide was added slowly with stirring. The temperature was kept between 80 and 90 C. for 3 hours. The sodium chloride formed was fil tered 01f and the dimethyl formamide was removed by evaporation. The brown solid formed was taken up in alkali, filtered over decolourising carbon and acidified. The precipitated product was recrystallized from water yielding 36 g. of 2-[2-(ethylthio)ethylthio]-5(6)-su1phobenzimidazole.
  • Preparation 14 Compound 14 9.4 g. of 3,4-diaminobenzenesulphonic acid and 6.5 .g. of tetrahydrothiophene-Z-carboxylic acid prepared by the method described by NJ. Putokhin and VS. Egorova in Zhur. Obshchai Khim. (J1. Gen. Chem.) 18, 1866 (1948) (C. A. 43, 3817 1949), were refluxed for 6 hours in 260 ml. of N hydrochloric acid. The solution was filtered over deoolourising carbon, the hydrochloric acid removed by evaporation and the residue recrystallised from methanol yielding 3 g. 2-(tetrahydro-Z-thienyl)-5(6)-sulphobenzimidazole.
  • Preparation 162Compound 16 To a solution of 17.8 g. of 2-o-mercaptophenyl-A lmidazoline prepared according to J1. Org. Chem. 1929, 52621 and 5.4 g. of sodium methylate in 200 ml. of methanol, 12.2 g. of propanesultone were added and the whole was refluxed for 2 hours. The methanol was removed by evaporation and the residue dissolved in 2 litres of water whereupon the solution was filtered over decolourising carbon and conducted over beads of insoluble sulphonated polystyrene as cation exchanger. The eluate was concentrated by evaporation and the residue recrystallized from ethanol/isopropanol yielding 5 g. of 2[o-(3-sulphopropylthio)phenyl]-A -imidazoline.
  • Preparation 171 Compound 17 37.6 g. of 3,4-diaminobenzenesulphonic acid and 33.6 g. of o-(methylthio)benzoic acid were heated for 6 hours at 200 C. in 100 g. of polyphosphoric acid. After quenching with 500 ml. of water the solid was dissolved in alkali whereupon the solution was filtered over decolourishing carbon and acidified yielding 54 g. of Z-(o-methylthiophenyl) -5 (6) -sulphobenzimidazole.
  • Preparation 18 Compound 18 20.6 g. of 3,4-diaminobenzenesulphonic acid and 7.5 g. of bis(carboxymethyl)sulphide were refluxed for 12 hours in 400 ml. of 6 N hydrochloric acid. The hydrochloric acid was removed by evaporation, the residue taken up in alkali and the solution formed filtered over decolourising carbon and acidified yielding 11 g. of bis(5(6)-sulpho-2- benzimidazolylrnethyl) sulphide.
  • Preparation 19 Compound 19 43.2 g. of disodium salt of 2-mercaptomethyl-5(6)-sulphobenzimidazole and 11.4 g. of allyl chloride were heated in 250 ml. of dimethyl formamide for 6 hours at 70 C. The dimethyl formamide was removed by evaporation-and the residue taken up in alkali whereupon the solution was filtered over decolourising carbon and acidified. The precipitate formed was recrystallized from water yielding 7 g. of 2-a.llylthiomethyl-5(6) sulphobenzimidazole.
  • Preparation 20 Compound 20 To a solution of 32.8 g. of Z-mercaptomethylbenzimidazole in 250 ml. of 1 N sodium hydroxide a solution of 8 47.2 g. of disodium a-bromosuccinate in ml. of water was added at 50 C. After having been stirred for 30 min. the solution was acidified with acetic acid and the precipitate formed recrystallized from water yielding 22 g. of 2-(a-succinylthiomethyl) benzimidazole monohydrate.
  • Preparation 21 Compound 21 206 g. of 3,4-diaminobenzenesulphonic acid and 21.5 g. of (phenylseleno)acetic acid prepared according to J1. Chem. Soc. 1928, 2293 were refluxed for 12 hours in 500 ml. of 6 N hydrochloric acid and 200 ml. of dioxan. The solution was filtered over decolourising carbon, the solvents removed by evaporation and the residue taken up in alkali. The solution was filtered and acidified whereupon the solid formed was filtered and recrystallized from water yielding 8 g. of Z-phenylselenomethyl-S (6)-sulphobenzimidazole.
  • Preparation 22 Compound 22 (a) 1-(methylthio)acetylthiosemicarbazide was prepared by the addition whilst stirring, of 124.5 g. of (methylthio)acetyl chloride to a suspension of 91 g. of thiosemicarbazide in 1 litre of dry pyridine. The temperature was maintained between -5 and 0 C. throughout the addition. The reaction mixture was left standing over night at room temperature whereupon most of the pyridine was removed by evaporation under reduced pressure.
  • Preparation 231Compound 23 To a suspension of 3-(3-sulphopropylthio)-5-mercapto- 1H-l,2,4-triazole sodium salt in a solution of 4.29 g. of potassium in 450 ml. of ethanol, 14.9 g. of chloroethyl ethyl sulphide were added at room temperature. After having been refluxed for 4 hours the mixture had become neutral. It was cooled and the precipitate formed was filtered by suction. The product was dissolved in water and conducted over an ion exchanger. The solution was evaporated till dryness and the oil obtained was neutralized with potassium hydroxide. The solution was evaporated and the residue recrystallized from methanol. Yield: 10 g.
  • the compounds of the invention can also be incorporated into another layer of the photographic material, e.g. a gelatin antistress layer or intermediate layer, which is in water-permeable relationship with the said emulsion layer or into one of the processing baths for said photographic material.
  • a gelatin antistress layer or intermediate layer which is in water-permeable relationship with the said emulsion layer or into one of the processing baths for said photographic material.
  • the antifoggants of use according to the present invention may be incorporated into any type of light-sensitive material comprising a silver halide emulsion layer e.g. a spectrally sensitized or non-sensitized silver halide emulsion layer, a silver halide emulsion layer of use in diffusion transfer processes for the production of silver images, an X-ray emulsion layer, and an emulsion layer sensitive to infra-red radiation. They may be incorporated into high speed negative materials as well as into rather low speed positive materials.
  • Various silver salts may be used as light-sensitive salt e.g. silver bromide, silver iodide, silver chloride, or mixed silver halides e.g. silver chlorobromide of silver bromoiodide.
  • the silver halides are dispersed in the common hydrophilic colloids such as gelatin, casein, zein, polyvinyl alcohol, carboxymethylcellulose, alginic acid, etc., gelatin being, however, favoured.
  • the common hydrophilic colloids such as gelatin, casein, zein, polyvinyl alcohol, carboxymethylcellulose, alginic acid, etc., gelatin being, however, favoured.
  • the amount of antifoggant employed in the light-sensitive silver halide material depends on the particular type of emulsion and the desired eifect and can vary within very wide limits.
  • the optimum amount of antifoggant to be added is best determined for each particular type of emulsion by trial. Generally, the most suitable concentration is between 0.2 millimole and 30 millimoles of antifoggant per mole of silver halide.
  • addenda such as hardening agents, wetting agents, plasticizers, colour couplers, developing agents and optical sensitizers can be incorporated into the emulsion in the usual way.
  • the antifoggants according to the present invention are particularly suitable for use in conjunction with compounds which sensitize the emulsion by development acceleration for example alkylene oxide polymers.
  • alkylene oxide polymers may be of various types.
  • Various derivatives of alkylene oxides may be used to sensitize the silver halide emulsions e.g. alkylene oxide condensation products as described among others in United States patent specifications 2,531,832 and 2,533,990, in United Kingdom patent specifications 920,637, 940,051, 945,340 and 991,608 and in Belgian patent pecification 648,710.
  • the values I and II given for the speed are exposure values corresponding with density 0.1 above fog and density 1 above fog respectively.
  • a decrease of the value by 30 means a doubling of the speed.
  • EXAMPLE 1 A series of six identical conventional photographic gelatino silver bromoiodide emulsions (4.5 mole percent iodide) comprising an amount of silver halide equivalent to 50 g. of silver nitrate per kg. of emulsion was prepared. To each of these emulsions except for one, was added a compound as listed in the table below in a concentration of.'0.001 mole per kg. of emulsion. Then the emulsions were coated on a conventional support and dried.
  • a compound as listed in the table below in a concentration of.'0.001 mole per kg. of emulsion.
  • Example 1 was repeated with the difference that the emulsion was divided into 10 aliquot portions to which the compounds listed in the table below were added in a concentration of 1 millimole per kg. of emulsion.
  • Example 1 Fresh material Ineubated material Speed Speed Compound Grada- Gradaadded Fog tion I II og tlon I II EXAMPLE 4 Example 1 was repeated with the difference that the emulsion was divided into 5 aliquot portions to which the compounds listed in the table below were added in the indicated concentration per kg. of emulsion.
  • Example 1 was repeated with the difference that the emulsion was divided into 2 portions to which the compounds listed in the table below were added in the indicated concentration per kg. of emulsion.
  • Z represents the atoms necessary to complete a heterocycle
  • Q stands for sulphur or selenium
  • A stands for an alkylene group, an alkylene group interrupted by one or more hetero atoms, an S-alkylene group, an S-alkylene group interrupted by one or more hetero atoms, or an arylene group;
  • X stands for an alkyl group, an alkenyl group or an aryl group, or
  • a and X together represent the atoms necessary to complete a saturated heterocycle
  • Photographic light-sensitive silver halide material according to claim 1, wherein said material also comprises a stabilizer of the hydroxytriazolopyrimidine type.
  • Photographic light-sensitive silver halide material according to claim 1, wherein said material also comprises a development accelerator of the polyoxyalkylene type.
  • Photographic light-sensitive silver halide material according to claim 1, wherein said emulsion layer is a gelatino silver halide emulsion layer.
  • Photographic light-sensitive silver halide material according to claim 1 wherein A stands for an alkylene group, an alkylene group interrupted by one or more hetero atoms, an S-alkylene group, an -S-alkylene group interrupted by one or more hetero atoms or an arylene group and X stands for an alkyl group, an alkenyl group or an aryl group.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
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  • General Physics & Mathematics (AREA)
  • Plural Heterocyclic Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
US799097A 1968-02-22 1969-02-13 Photographic material with a stabilizer antifoggant bidentate compound Expired - Lifetime US3667957A (en)

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GB8652/68A GB1209813A (en) 1968-02-22 1968-02-22 Improved photographic silver halide material

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US3667957A true US3667957A (en) 1972-06-06

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US (1) US3667957A (en(2012))
BE (1) BE728387A (en(2012))
DE (1) DE1908217C2 (en(2012))
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057425A (en) * 1975-07-16 1977-11-08 Polaroid Corporation 2-Substituted benzimidazoles in multicolor diffusion transfer
US4503139A (en) * 1983-05-09 1985-03-05 Polaroid Corporation Photographic products and processes and novel compounds
US4847383A (en) * 1983-05-09 1989-07-11 Polaroid Corporation Photographic reagent tetrazoles
EP1484323A1 (en) * 2003-06-06 2004-12-08 Agfa-Gevaert 2-thiosubstituted benzimidazole derivatives as surfactants for photographic application

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4420554A (en) * 1981-02-17 1983-12-13 Mitsubishi Paper Mills, Ltd. Silver halide photosensitive materials
FR3108191B1 (fr) 2020-03-10 2023-05-19 Psa Automobiles Sa Procédé et dispositif de mise à jour d’un logiciel comportant des adresses physiques vers la mémoire d’un calculateur embarqué d’un véhicule

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE621606A (en(2012)) * 1961-08-25
US3202512A (en) * 1962-02-23 1965-08-24 Eastman Kodak Co Photographic silver halide emulsions stabilized with tetrazaindene compounds
US3255202A (en) * 1963-08-23 1966-06-07 Union Carbide Corp Process for the preparation of 2-(acylamidoalkyl)benzimidazoles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057425A (en) * 1975-07-16 1977-11-08 Polaroid Corporation 2-Substituted benzimidazoles in multicolor diffusion transfer
US4503139A (en) * 1983-05-09 1985-03-05 Polaroid Corporation Photographic products and processes and novel compounds
US4847383A (en) * 1983-05-09 1989-07-11 Polaroid Corporation Photographic reagent tetrazoles
EP1484323A1 (en) * 2003-06-06 2004-12-08 Agfa-Gevaert 2-thiosubstituted benzimidazole derivatives as surfactants for photographic application
US20040249166A1 (en) * 2003-06-06 2004-12-09 Agfa-Gevaert Novel surfactants
JP2004359649A (ja) * 2003-06-06 2004-12-24 Agfa Gevaert Nv 新規な界面活性剤
US7015332B2 (en) 2003-06-06 2006-03-21 Agfa Gevaert 2-thioalkyl-benzimidazole-5 or 6 sulphonic acids

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GB1209813A (en) 1970-10-21
DE1908217C2 (de) 1983-12-22
FR2002378A1 (en(2012)) 1969-10-17
DE1908217A1 (de) 1969-09-11

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