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

• Thistinvention relates to photographic develop'ers'and particularly to phenoxyalkylamines as accelerators for photographic developers.
• amines such as primary and secondary alkyl and alkylene amines containing from 3 to '7. carbon atoms, 7 and heterocycli'c amines. such as morpholine' and piperidine as disclo'sed in United States Patent No'. 2,304,025, maybe added to photographic black and white and color developing solutions for the purpose of increasing the rate of development.
• these amines accelerate the development so as. to cause thedeveloping agent to form the image .(silverl er cio'ljr im' e). more rapidly than i-s"po'ssible without the'preserlfce of suchfamines;
• an object of the present invention to provide a black and white and color developer having an increased rate of development so that the developing time is substantially decreased to about one-half of the normal time, and which developer is less toxic than those heretofore used.
• phenoxyalkylamines employed in accordancewith the present invention are represented by the following general formulae:
• chlorine, bromine and the n is a positive integer of from 2 to 3
• X ' is hydrogen, a nitro group, or a halogen such as The following are examples of such phenoxy- 'fl Phenoxyethylamine .sstationsamateurish fl-ti-nitroph euoxy) -ethylaniine o emeemase,
• the sulfate and hydrochloride salts are readily prepared by the addition of a stoichiometrical quantity of dilute sulfuric acid and hydrochloric acid, respectively, and the carbonate is prepared by bubbling CO2, into an alcohol, ether, or benzene solution of the base.
• the developing time is cut from 20-30 minutes to 2-10 minutes. All of the layers are simultaneously developed, and the dye images formed are of excellent quality.
• the developing time with black and white developers for instance, solutions of hydroquinone and p-monomethylaminephenol sulfate and the like, is also out to about one-half without causing fog when such solutions contain a phenoxyalkylamine. 7
• the most useful concentrations in black and White and color developers range from about 1 to 8 grams per liter of developer solution.
• Example I p-Monomethylaminophenol sulfate grams 0.08 Sodium sulfite (anhydrous) do 45 Hydroquinone do 1.2 Sodium carbonate (monohydrate) do 8 Potassium metabisulfite do 4 Potassium bromide do 1.5 fi-Phenoxyethylamine do 4 Water to make liter 1
• This tank developer gives, on development at 20 C. of the usual roll film, a negative in about 6 to 8 minutes after fixing and washing. The time required to develop a similar roll in the same developer and at the same temperature, but containing no B-phenoxyethylamine, ranges from 15 to 20 minutes. Increasing the concentration of the ,8-phenoxyethy1amine to 6 grams per liter eifects a further decrease in time.
• Example II The following developer requires 30 minutes at 20 C. to give a satisfactory degree of color development with color paper:
• the color photographic multi-layer element utilized in the foregoing example consists of an integral tri-pack emulsion coated on either the usual paper base, or a clear cellulose acetate or nitrate film base, or in some cases an opaque white film base.
• Each of the emulsion layers is sensitized to one of the primary colors 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.
• a yellow dye is formed in the blue sensitive emulsion; a magenta dye is formed in the green sensitive emulsion; and a cyan dye is formed in the red sensitive emulsion.
• the combination of the dye images from these three printing primaries yields the color picture.
• Suitable methods for the preparation of multi-color emulsion layers have been described in the literature relating to color photography, and are, therefore, not described here.
• Example III The following developer requires 19 minutes at 20 C. to give a satisfactory degree of color de-
• a color paper of excellent color rendition is developed in about 8 minutes.
• Increasing the concentration of the amine to 6 grams reduces the time of development to 6 minutes with the same results.
• Example IV The color developer of the preceding example with the addition of 5 grams of [3-phenoxyethy1- amine developed a multi-layer color film sheet, of the reversal type, and containing color formers fast to diffusion, in about 8 minutes at 20 C whereas without the 18-phenoxyethylamine, the,
• time required to color develop the said film sheet is over 30 minutes.
• R and R1 represent a group selected from the class consisting of hydrogen and methyl, R being hydrogen when R1 is methyl and R1 being hydrogen when R is methyl, 'n is a positive integer of from 2 to 3, and X is a group selected from the class consisting of hydrogen, nitro and halogen, and the salts of said amines.
• the step comprising the development of an exposed silver-halide emulsion in an alkaline developer containing an aromatic silver-halide developing agent for said emulsion and a developing accelerator selected from the class consisting of phenoxyalkylamines corresponding to thefollowing formulae:
• R and R1 represent a group selected from the class consisting of hydrogen and methyl, R being hydrogen when R1 is methyl and R1 being hydrogen when R is methyl, n is a positive integer of from 2 to 3, and X is a group selected from the class consisting of hydrogen, nitro and halogen, and the salts of said amines.
• the step comprising the development of an exposed silver-halide emulsion an; alkaline developer: containing" 18.1! aromatic siliverehalide developing agent for said" emulsionand a deyelrfi oping accelerator characterized by the formula:
• the step comprising the development of an exposed silver-halide emulsion in an alkaline developer containing an aromatic silver-halide developingagent for said emulsion and a developing accelerator characterized by the formula:
• the step comprising the development of an exposed silver-halide emulsion in an alkaline developer containing an aromatic silver-halide developing agent for said emulsion and a developing accelerator characterized by the formula:
• a color -forming photographic developer comprising a primary aromatic amino developing agent and a phenoxyalkylamine selected from the class consisting of those corresponding to the following formulae:
• a color-forming photographic developer 7 8 cqmprismg a primary aromatiearnino develoging REFERENCES CITED agent and a phenoxyalkylamlne characterlzed by the following formula: v V
• the following references are of record in the file of this patent:

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

Priority Applications (6)

Applications Claiming Priority (1)

Publications (1)

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Cited By (17)

Citations (3)

• 0
  • BE BE490074D patent/BE490074A/xx unknown
• 1948
  • 1948-07-09 US US37965A patent/US2482546A/en not_active Expired - Lifetime
• 1949
  • 1949-05-27 GB GB14279/49A patent/GB658575A/en not_active Expired
  • 1949-06-12 DE DEP45570A patent/DE851719C/de not_active Expired
  • 1949-07-04 CH CH280519D patent/CH280519A/fr unknown
  • 1949-07-09 FR FR990475D patent/FR990475A/fr not_active Expired

Patent Citations (3)

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