Classifications

• • 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
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/32—Colour coupling substances
  • G03C7/36—Couplers containing compounds with active methylene groups

Definitions

• This invention relates to photographic color development and to processes of color development for use in connection with color photography.
• Y-rCHri-B where Y is one of the electro-negative groups CR- or 2.00- (wherexis anelhior aryl group, substituted or unsubstitimd) while B is an arylor hctcrocyclo-substitutcd amino roup.
• the invention are compounds having the general formula: "Ii "if --on
• the invention comprises the process of poration, in the photographic emulsion, before or after coating, of a color coupler as above deiineii and, further. the process of developing a latent photographic image by means of a color developer comprising in addition to an aromatic amino developing agent a color. coupler as above defined.
• the invention includes the method of color development which comprises developing a latent photographic image by means 01' an aromatic amino developer in the presence of color couplers as above defined, and eliminating the silver image which is formed during development so that a clear and transparent color image remains.
• the invention also consists in new or improved color iorming developers comprising, in addition to an aromatic amino developing agent, color couplers as above, defined.
• the present invention includesphoto- 2 l s,sso,soc
• graphic elements having at least one layer con- B essentially of the product resulting from the taining maker and transparent image composed cm-C c-N coupling in situ during development of color couplers as above defined, with the oxidation 5 K Cnhco product of an aromatic amino developing agent.
• the aromatic amino compounds which may be uethmol' "com" 100 used as developing asents in the present inventlon include the mono-, diand tri-amino-aryl- For m B to compounds.
• the mono-amino developing Rosanna 4 agents may be mentioned amino-phenols and amlno-cresols and their halogen derivatives and 4 amino-naphthols.
• the developing agents preferably used and g pan phenylened e g 3 having hitherto given the best results in connecl5 s u tion with the present invention are the aromatic fi fi fi g zgfl'i "g" :3 orthoand para-diamines. such as para-phenyl- 7 sodium hydroxide 2 enedlamine and its substitution products.
• These water h" 1000 developing agents may be substituted in one aminogroup'orintheringorinbothJormingzo 3 compounds such as: NR diethyl-para-phenylenedlamine.
• the invention is in no way limited to the use oi the color couplers in the developing solution itself.
• the color coupler which during the development forms the dye, can also be added to the photographic emulsion (for instance by adsorption upon the silver salts) before or after coating.
• the other ingredients of the color forming baths containing chiefly the aromatic amino developer, may be applied later, during the developing process. as a bath.
• the present invention may be utilized in the formation of colored photographic images on plates or papers as well as on films, employing gelatine or some other carrier substance :lor the silver halide.
• the developing process may be used for developing photographic material, provided with one or more sensitive layers, which are, applied on one side or on both sides of the support.
• the silver formed during the developing process may be eliminated.
• a bath should be used, however, which does not destroy the dye.
• a bath consisting of a solution in water of potassium ferricyanide and sodium thiosulphateeasily eliminates the silver without destroying the dye, leaving a pure dye image.
• the process of developing a colored image in a. gelatin-silver halide photographic layer which comprises coupling the development product of a primary aromatic amino developing compound with the coupler compound, 3 benzyl-5 acetonyll,2,4-oxodiazole 2.
• the process of developing a colored image in a gelatin-silver halide photographic layer which comprises coupling the development productof a primary aromatic amino developing compound with the color coupler compound of the general formula wherein X is an electro-negative organic radicalselected from the class consisting of acyl and cyano, while Y is an organic radical of the class consisting of substituted alkyl.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Thiazole And Isothizaole Compounds (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=26255644

Family Applications (1)

Country Status (6)

Cited By (8)

Families Citing this family (2)

• 0
  • BE BE440012D patent/BE440012A/xx unknown
  • IT IT390064D patent/IT390064A/it unknown
  • BE BE490600D patent/BE490600A/xx unknown
• 1939
  • 1939-12-11 GB GB31978/39A patent/GB540760A/en not_active Expired
• 1940
  • 1940-12-11 DE DEG1238D patent/DE870947C/de not_active Expired
• 1941
  • 1941-01-11 FR FR869169D patent/FR869169A/fr not_active Expired
  • 1941-04-18 US US389222A patent/US2380809A/en not_active Expired - Lifetime
• 1948
  • 1948-08-20 GB GB22002/48A patent/GB645043A/en not_active Expired
• 1949
  • 1949-08-18 FR FR59472D patent/FR59472E/fr not_active Expired

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