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
  • G03C7/327—Macromolecular coupling substances

Definitions

• This invention relates tographic color images.
• This invention has as an object. an improved method for making photographic color images.
• A. further object is a method for improving the manufacture of color formers fast to diffusion.
• condensation products are feebly colored powders, easily soluble in diluted alkalies.
• the solutions showing a pH-value of 912 may be added to the photographic emulsion at any point of the manufacturing process. If necessary, these compounds may be added previously to a gelatin solution, whereupon this gelatin may be subjected to a washing process before it has soliditied and before it is cut into small cubes, in order to dissolve out eventually uncondensed parts of the reaction components. The gelatin thus treated is then added to the photographic emulsion.
• the silver halide emulsion thus obtained which, before casting, may be subjected to a short washing process, is worked up into photographic layers in a manner known per se, said layers being arranged on one or both sides of a support, if necessary, on top of one another and being sensitized for diflerent spectral regions.
• the silver halide emulsions may be worked up also in a different manner. According to U. S. Patent 2,186,730, there may be arranged for instance on a support differently sensitized emulsions bearing various colorformers in the form of minute particles.
• the manufacture of the color images can be accomplished in'various ways, for instance ac-- cording to U. S. patent application Ser. No. 111, 250, filed November 17, 1936, and U. S. Patents 2,179,228, 2,179,238, 2,186,730, 2,178,612 and 2,186,849.
• the images may be formed in the exposed emulsion layers by simple color forming development or reversal development according to U. S. Patents 2,229,137 and 2,179,234.
• the color formers according to this invention may be employed together with other color formers fast to difiusion within the different emulsion layers, according to U. S. Patents 2,179,- 238, 2,178,612, 2,186,849, 2,186,850, 2,179,244 and 2,186,732.
• Example I 94 grams of phenol and 84 grams of salicylic aldehyde are heated to boiling and after adding 1 gram of gaseous hydrochloric acid, the whole is boiled under reflux for three hours. The condensation product thus obtained is dissolved in 200 cc. of glacial acetic acid and precipitated with 3 liters of ether. A feebly red powder soluble in alkalies is obtained.
• Example I! condensation product thus obtained is diluted with 100 cc. of ether and precipitated with 1 liter of benzine. Dissolution in a small amount of ether and precipitation with benzine are repeated three times. A grey powder is then obtained, soluble in alkalies with a feebly yellow color.
• Example III 100 grams of m-cresol and 84 grams of salicylic aldehyde are heated to boiling under reflux for 5 hours and a feeble current of gaseous HCl is slowly conducted through the reaction mixture.
• the condensation product thus obtained is diluted with 100 cc. of ether and precipitated with 1 liter of benzine. Dissolution in a small amount of ether and precipitation with benzine are repeated three times. A grey powder is then obtained, which is soluble in alkalies with a feebly yellow color.
• Example IV 100 grams of 1-2-3-xylenol and 84 grams of salicylic aldehyde are heated to boiling under reflux for 5 hours and a feeble current of gaseous HCl is conducted therethrough.
• the con densation product thus obtained is diluted with 100 cc. of ether and precipitated with 1 liter of benzine. Dissolution in a small amount of ether and precipitation with benzine are repeated three times. A grey powder is then obtained which is soluble in alkalies with a feebly yellow color.
• a silver halide emulsion for color photography containing as a color former the product obtained by the condensation of a substance selected from the class consisting of phenol and its nuclear substituted alkyl derivatives with an aromatic hydroxy aldehyde.
• compositions as defined in claim 4 wherein the hydroxyaldehyde is an ortho-aldehyde of the benzene series.
• the improvement which comprises developing an exposed silver halide emulsion with an aromatic primary amino developer in the presence of the condensation products of a substance selected from the class consisting of phenol and its nuclear substituted alkyl derivatives with a hydroxybenzaldehyde.

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• Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• General Physics & Mathematics (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Color Printing (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7196224

Family Applications (1)

Country Status (4)

Cited By (1)

• 0
  • BE BE439564D patent/BE439564A/xx unknown
• 1940
  • 1940-06-18 US US341180A patent/US2341372A/en not_active Expired - Lifetime
  • 1940-06-28 CH CH232632D patent/CH232632A/de unknown
• 1941
  • 1941-05-23 FR FR872440D patent/FR872440A/fr not_active Expired

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