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 the production of photographic images by color development, and more particularly to a new group of color couplers.
• R is amino, substituted by an arylor heterocyclic group.
• X is an electro-negative organic radical, for instance CN, alkyl-CO, aryl-CO, Y is an organic radical, hydrogen.
• Another object of my invention is to provide a new color developer.
• Still another object of myinvention is to provide new light-sensitive silver halide emulsions.
• a further object of my invention is to provide a colored photographic image.
• Y is hydrogen, an aliphatic-, homoor heterocyclic group either substituted or not.
• the reactive methylene group may also be substituted by atoms or groups which, on developing, easily spilt-off. such as for instance bromo.
• the brown precipitate formed is purified by boiling with alcohol.
• the new color couplers may either directly be added to the photographic colloid layer, either before or after coating so that the colored image is formed by developing with an aromatic developer, or the colored image may be obtained by developing the photographic image with an aromatic developer which contains one of the above-defined color couplers.
• the colloid layer to which the color coupler is added may be a light-sensitive silver halide [2-p-nitrophenyl-1,3,4-oxodia-
• a developing bath for obtaining color images according to my invention is "the following:
• a N ,N-diethylparaphenylenegdiamine Z is a member selected from the group consisting of.0 ands,
• Process for the production of photographic color images by coior development which comprises developing with a primary aromatic amino developing agent a reducible silver salt image in a light-sensitive silver salt emulsion containing a compound of the following general iormula:
• Nr N H g 1-0 -CH2GN z "wherein Z is amember selected from the group consisting hydrochloride grams 5 Sodium sulphite (cryst.) do Sodium carbonate (cryst.) do 100 Sodium hydroxide do 1 Water cm'. 1000 B C n u NO 0 OCH:CN ..grams 1 Acetone cm. .30
• My invention may be used for obtaining colored photographic images upon plates, ,paper or film, coated with a light-sensitive silver halide emulsion.
• the color developing process may be used for developing photographic material with one or more light-sensitive layers coated on one side or on Jooth sides 26f the support.
• the silver image-termed during the development can easily be removed by treatment in a bleach-bath.
• the bleach-bath used is not allowed to exert anoxious influence upon the colored image.
• A'bleach-hath of potassium ferricyanide and sodium thiosulphate removes the silver without damaging the color image.
• Z is a member selected from the group consisting of O and S,
• Y is a member selected from the group consisting of aliphatic-,homoandheterocyclic groups.
• Y' is a member selected from the group consisting of aliphatic-, homoand heterocyclic groups.
• Color photographic developer containing .a primary aromatic amino developing agent and 1a com-poundof thefol-lowing general formula:
• Y is .a member selected .from the group nourishing of aliphatic-, homoand heterocirclicsgroups.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3895842

Family Applications (1)

Country Status (3)

Cited By (4)

Citations (1)

• 0
  • BE BE459542D patent/BE459542A/xx unknown
• 1948
  • 1948-02-26 US US11324A patent/US2473166A/en not_active Expired - Lifetime
• 1949
  • 1949-11-08 DE DEG345A patent/DE806936C/de not_active Expired

Patent Citations (1)

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