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

• Our present invention relates to the art of color photography.
• One of its objects is a process of producing photographic color pictures by means of dyestufl components.
• a further object is the provision of novel photographic materials used for producing the photog.'aphic color pictures. Further objects will be seen from the detailed specification 1'01- lowing hereafter.
• Patent 1,963,197 or similar processes working with diazonium compounds are used, one obtains by coupling with acetic acid ester anilides yellow dyestufl pictures.
• This invention is based on the observation that the methylene group in such compounds may be made particularly active if the body is converted into an oxalic acid ester derivative of the compound or derivative thereof.
• oxalic acid ester derivatives which provisionally maybe regardedas compounds oi. the following structure:
• behave in the photographic color as do the bodies having the highly reactive methylene groups refered to above.
• the oxalic acid ester or fluorene of the following formula yields when used as dyestuilf component in' color development a red dyestuii picture of particularly pure tint when dimethylaminoaniline is used as a developer, the oxalic acid ester of indene .cri/
• the support may either consist of a transparent material as for instance Celluloid,
• cellulose-acetate or of a light-reflecting material, as for instance paper.
• An exposed silver halide emulsion layer is developed by means of a developer consisting of a solution of 3 grams of p-aminodimethyl-aniline and 1000 cc. of a 3% soda-solution to which are added 1.5 grams of the oxalic acid ester of fluorene.
• a color forming developer comprising an aromatic amino developing agent and a compound containing a methylene group activated by substitution of one hydrogen atom thereof by a radical of the following formula wherein R is an alkyl radical.
• a color forming developer comprising an aromatic amino developing agent and a compound containing a methylene group, said compound being per se insufficiently reactive to form a dye by color forming development but being activated by substitution of one hydrogen atom of the methylene group by a radical of the following formula -o-c-on 3 Ii 0 wherein R is an alkyl radical.
• a color forming developer comprising an aromatic amino developing agent and a compound selected from the group consisting of fluorene, benzofluorene, indene, dihydroresorcinol, hydroxythionaphthene, diphenyimethane and cyclohexanol, in-which the methylene group is activated by substitution of one hydrogen atom by a radical of the following formula Jc J-oR I 0 0 wherein R is an alkyl radical.
• R is an alkyl radical

Landscapes

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

Applications Claiming Priority (1)

Publications (1)

Family

ID=5767278

Family Applications (1)

Country Status (4)

Cited By (3)

• 0
  • BE BE420187D patent/BE420187A/xx unknown
• 1937
  • 1937-02-20 US US126842A patent/US2186850A/en not_active Expired - Lifetime
  • 1937-02-24 CH CH201643D patent/CH201643A/de unknown
  • 1937-02-25 FR FR818388D patent/FR818388A/fr not_active Expired

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