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
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
  • G03C5/29—Development processes or agents therefor
  • G03C5/305—Additives other than developers

Definitions

• amines such as primary and secondary alkyl and alkylene amines containing from 3 to '7 carbon atoms, and heterocyclic amines, may be added to photographic black and white and color developing solutions for the purpose of increasing the rate of develop ment. In other words, these amines accelerate the development so as to allow the developing agent to form the image (silver or color image) as rapidly as possible.
• an object of the present invention to provide a blackand white and color developer having an increased rate of development so that the developing time is substantially decreased to less than half of the normal time.
• the developing time with black and white developers for instance, solutions of hydroquinone and Metol and of 'hydroquinone and Elon, and the like, is also cut by more than half without causing fog when such solutions contain an aralkyl amine.
• aralkylamines to be employed in accord ance with the present invention are represented wherein R is methyl .or ethyl and a positive integer ofpfrom 2 to .3.
• the amines are soluble'in water and in alkaline developers, and'may he used "in specified amounts.
• the most useful concentrations in 'blacka'rrd white developers range from about 1.0 cc. to about '10 cc. per liter.
• the -most useful concentrations range from about 2.0 cc. to 7.0 cc. per liter. Concentrationsgreater than 7.0 cc per liter of color developer have the tendency to distort the color balance of the color film.
• illustrative developing solutions containing such aralkylaanines the following are given:
• Example I v v v iMetol grams Sodium .sulfite ,(anhydrous). .sdo Hydroquinone do s Sodium carbonate (monohydrate). .d0f "Q .Potassium .metabisulfite .d.o s Potassium. .bromide do H a-IPhenylethylamine .cc 2.5 Water to make liter 1.0
• This tank developer gives, on developmental C. of the usual roll film, a soft negative in about 4-6 minutes after fixing and washing.
• the time required to develop a similar roll in' title same developer and at the same temperature, containing no a-phenylethy'lamine, ranges from 15 to 20 minutes.
• the color paper utilized in the foregoing example, consists of an integral tripack emulsion coated on either the usual paper base, or a clear cellulose acetate velopment with color paper! Sodium hexametaphosphate grams; 1.0 Sodium bisulfite do 2.0 N-N-bis(,3-hydroxylethyl) p:-phenylenedi-. H amine sulfate -grams 6.3 Sodium carbonate do 100 U Hydroxylamine hydrochloride do ;s 1.0 i Potassium bromide do 1.0 Water to make liter 7 1.0
• each of the emulsion layers is sensitized to one of the primarycolors of light; namely, blue, green and red. ⁇
• the top layer is blue sensitive.
• a filter layer, yellow in color and blue absorbing, lies under the top layer. Below this filter layer, lies a green sensitive emulsion layer, and below this a red sensitive emulsion layer.
• Each of the three silver-halide emulsion layers contains dye-forming compounds which unite during the development of a silver image in an aromatic amine developing agent to form a dye with the oxidation product of the developing agent. As silver is also formed during de- Example III The following developer requires 19 minutes at 20 C. to give a satisfactory degreeof color development with color paper:
• Example IV The color developer of the preceding example with the addition of 5.0 cc. of e-phenylethylamine developed ;:a multi-layergcolorgfllm sheet, of the reversal type and containing color-formers fast to diifusion, in 10 minutes at 20 C'.; whereas without the aphenylethylamine the time required .to color develop the. said film sheet is over 30 "minutes.
• aralkylamines described herein have the advantage that they effect a simultaneous increase in contrast and greater reduction in developing'time than other amines heretofore used for this purpose.
• Analkaline photographic developer for silver halide emulsions comprising an aqueous solution of a silver halide developing agent, an inorganic alkali and an aralkylamine selected from the class consisting of those' corresponding to the following formulae:
• R is a group selected from the class consisting of methyl and ethyl groups, and n is a positive integer of from 2 to 3.
• An alkaline photographic developer for silver-halide emulsions comprising an aqueous so lution of a, silver halide developing agent, an inorganic alkali and an aralkylamine characterized by the following formula:
• An alkaline photographic developer for silver-halide emulsions comprising an aqueous solution or a silver-halide developing-agent, an inorganic alkali and an aralky-lamine characterized by the following formula:
• An alkaline photographic developer for sil ver-halide emulsions comprising an aqueous so lution of a silver-halide developing agent, an inorganic alkali and an aralkylamine characterized by the following formula:
• a photographic negative comprising the'development of an exposed silver-halide emulsion in an aqueous solution of an alkaline silver halide developing agent, said solution containing an inorganic alkali and a, developing accelerator selected from the class consisting of aralkyl amines to the following formulae:
• the step comprising the development of an exposed silver-halide emulsion in an aqueous solution of an alkaline silver halide developing agent, said solution containing an inorganic alkali and a developing accelerator characterized by the formula:
• a color-forming photographic developer comprising an aqueous solution of a primary aromatic amino developing agent, an inorganic alkali and an aralkylamine selected from the class consisting of those corresponding to the followin formulae:
• R is a group selected from the class consisting of methyl and ethyl groups, and n is a positive integer of from 2 to 3.
• a color-forming photographic developer comprising an aqueous solution of a primary aromatic amino developing agent, an inorganic alkali and an aralkylamine characterized by the following formula:
• a color-forming photographic developer comprising an aqueous solution of a primary aromatic amino developing agent, an inorganic alkali and an aralkylamine characterized by the following formula:
• a color-forming photographic developer comprising an aqueous solution of a primary aromatic amino developing agent, an inorganic alkali and an aralkylamine characterized by the following formula:

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Measurement Of Predetermined Time Intervals (AREA)

Priority Applications (6)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7425177

Family Applications (1)

Country Status (5)

Cited By (9)

Citations (2)

• 0
  • BE BE483825D patent/BE483825A/xx unknown
• 1947
  • 1947-08-26 US US770750A patent/US2515147A/en not_active Expired - Lifetime
• 1948
  • 1948-04-06 GB GB9657/48A patent/GB637148A/en not_active Expired
  • 1948-06-22 FR FR968132D patent/FR968132A/fr not_active Expired
• 1949
  • 1949-01-01 DE DEP29333D patent/DE876506C/de not_active Expired
• 1951
  • 1951-07-08 DE DESCH7057A patent/DE876606C/de not_active Expired

Patent Citations (2)

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