US2388859A - Mixed grain emulsions - Google Patents

Mixed grain emulsions Download PDF

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Publication number
US2388859A
US2388859A US373790A US37379041A US2388859A US 2388859 A US2388859 A US 2388859A US 373790 A US373790 A US 373790A US 37379041 A US37379041 A US 37379041A US 2388859 A US2388859 A US 2388859A
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Prior art keywords
blue
emulsion
mixed grain
sensitive
grains
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Expired - Lifetime
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US373790A
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English (en)
Inventor
Leopold D Mannes
Jr Leopold Godowsky
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Eastman Kodak Co
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Eastman Kodak Co
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    • 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
    • G03C7/26—Silver halide emulsions for subtractive colour processes
    • 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
    • G03C7/3022—Materials with specific emulsion characteristics, e.g. thickness of the layers, silver content, shape of AgX grains

Definitions

  • MIXED GRAIN EMULSION Filed Jam 9,-1941 PRMTING LKGHT YELLOW FILTER MIXED GRAIN EMULSION AND RED LIGHT SENSITIVE PARTICLES SUPPORT 'LEEIPDLD n' MANNES' LEDPDLD GDDDWSKY. JR. INVENTORS V ATTORNEYS CONTAINING FAST awe, .SLOW GREEN 1 Patented Nov. 13, 1945 man GRAIN EMULSIONS Leopold D. Mannes, New York, N. Y., and Leopold Godowsky, Jr., Westport, Conn., assignors to Eastman Kodak Company, Rochester, N. Y., a corporation of New Jersey Application January 9, 1941, Serial No. 313,790 In Great Britain January 11, 1940 2 Claims.
  • This invention relates to color photography and more particularly to a duplicating and printing material having a mixed grain emulsion layer.
  • Photographic films provided with emulsions of the mixed grain type are well known. These con sist essentially of emulsions containing a mixture I to record red or green.
  • this same problem is also present and may be solved by coating the red and' green sensitive layers under a-blue sensitive layer and screening these layers from blue light by means of a filter dye.
  • Such an expedient is not I possible in a mixed grain system where particles sensitive to all three color components are exposed to the action of light rays at a common surface. It has been suggested to bath the red and green sensitive particles in a yellow dye solution thereby reducing their blue sensitivity.
  • Another proposal is to use silver chloride emulsions for the green and red components and silver bromide for the blue component emulsion, thereby utilizing the sensitivity of silver chloride to shorter wave lengths than silver bromide.
  • the object of the present invention is to provide a mixed grain emulsion which avoids the difliculties of the prior art.
  • Another object is to provide a mixed grain emulsion consisting of silver halide grains of high sensitivity and wide latitude.
  • Another object is to described the method of using a film provided with the mixed grain emulsion of this invention, as a printing and duplicating material.
  • Another object is to provide a two or three color component mixed grain emulsion, certain grains of which are sensitive to a region of the visible spectrum other than the blue and are not especially screened against blue light.
  • Another object is to provide sensitizing dyes which restrict sensitivity to the grains of a mixed grain emulsion which they are intended to sensitize and do not confer .sensitivity on other grains.
  • a photographic printing material consisting of a support upon which is coated a mixed grain emulsion layer containing fast silver halide grains sensitive to the blue spectral region, and slow silver halide grains sensitive to a region of the visible spectrum other than the blue, as well as the blue spectral region,
  • blue light being considerably greater than the sensitivity of any other grains to blue light.
  • the silver halide emulsions which may be used are those containing silver bromide or silver bromo-iodide, preferably silver bromo-iodide.
  • the silverhalide emulsion component sensitive to the blue spectral region is provided by a fast negative emulsion of the type used in motion picture negative or press film, such as that described by Carroll, Bureau of Standards Scientific Paper No.,340, and having a high sensitivity to blue light.
  • the emulsion components sensitive to a spectral region other than the blue ar provided by emulsions of the type used in positive films or enlarging papers and which have a blue speed many times less than that of the high speed negative emulsion. We may use as a mixed.
  • the support t may be any suitable material such as paper, glass, synthetic resin, a cellulose ester or a metal plate, such as aluminum.
  • the emulsion layer ll of our invention consists of grains of silver halide sensitized to record different regions of the visible spectrum, joined to the support by any suitable subbing means (not shown).
  • the yellow filter 12 may be composed of a yellow dye such as tartrazine in gelatin and may be applied as a Our invention may be further illustrated by the following example:
  • Example One liter of a slow silver bromide paper emulsion is divided into two equal portions. To the first portion is added 2.0 gm. of 2,2'-dimethyl- 8 ethyl 3,4,3',4' dibenzthiacarbocyanine bromide, and to the second,portion is added 2.0 gm. of 2,1'-diethyl-3,4-benzthia-2'-cyanine bromide. The two portions are held at a temperature of 50 C. for 10 minutes then mixed, combining with this mixture 500 cc. of a fast negative type emulsion, such as is used in motion picture negative or press films. The mixed grain emulsion is then coated on a support in a known manner.
  • a fast negative type emulsion such as is used in motion picture negative or press films.
  • the photographic printing'material prepared as described above may be used for the reproduction of natural color pictures by printing from a transparency through a filter.
  • the filter is one which absorbs just enough blue light so that the printing speed of the fast blue sensitive component of the mixed grain emulsion is reduced to a value equivalent to those of the red and green speeds of the two other compoents.
  • a yellow filter absorbing 98% of the overall blue light may be used.
  • Such a filter is one containing a dye of the pyrazalone type exemplified by tartrazine.
  • This filter would reduce the blue speed of the red and green sensitive components of the mixed grain emulsion to approximately 2% of the speeds of the red and green thereby rendering the blue sensitivity of these grains negligible for printing purposes.
  • the high speed blue sensitive emulsion still prints the blue record at the same speed required for printing the red and green records onto the other two components.
  • a mixed grain emulsion consisting of particles sensitized to record only two regions of the spectrum, one of which is the blue, and coat this emulsion on one side of a support and a second emulsion sensitive to the third color component is coated on the opposite side of the support.
  • filter layer over the mixed grain emulsion layer.
  • the films constructed in the manner of our invention may have color couplers or dyestufi formers incorporated in the emulsion layers but preferably these are-in the developing solution and form a dye simultaneously and in situ with the oxidation product of the developer.
  • the color forming developers which we may use are the primary aromatic amino developing agents such as diethyl-p-phenylene diamine.
  • the couplers which may be used are those having a methylene group or phenolic hydroxyl group reactive in the coupling process.
  • a photographic material sensitive to different regions of the visible spectrum comprising a support having thereon a single mixed grain emulsion layer containing coarse, highspeed silver bromide grains sensitive to only the blue region of the spectrum, and fine, slow-speed silver bromide grains sensitive to the blue region and also to another region of the visible spectrum, the sensitivity to blue light of said highspeed grains being approximately times the sensitivity to blue light of said slow-speed grains.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US373790A 1940-01-11 1941-01-09 Mixed grain emulsions Expired - Lifetime US2388859A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB622/40A GB540444A (en) 1940-01-11 1940-01-11 Improvements in colour photography and materials therefor

Publications (1)

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US2388859A true US2388859A (en) 1945-11-13

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US (1) US2388859A (fr)
FR (1) FR943627A (fr)
GB (1) GB540444A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592243A (en) * 1948-10-30 1952-04-08 Eastman Kodak Co Method of selectively exposing the grains of a mixed grain photographic emulsion
US2703282A (en) * 1950-12-14 1955-03-01 Eastman Kodak Co Increasing the exposure latitude of photographic emulsions by sensitizing
US3628960A (en) * 1967-04-21 1971-12-21 Agfa Gevaert Nv Light sensitive halide material with variable contrast
US4351898A (en) * 1978-01-03 1982-09-28 Goldberg Richard J Mixed grain single emulsion layer photographic material
US4433048A (en) * 1981-11-12 1984-02-21 Eastman Kodak Company Radiation-sensitive silver bromoiodide emulsions, photographic elements, and processes for their use
US4439520A (en) * 1981-11-12 1984-03-27 Eastman Kodak Company Sensitized high aspect ratio silver halide emulsions and photographic elements
US5536624A (en) * 1994-06-02 1996-07-16 Mitsubishi Paper Mills, Ltd. Silver halide photographic photosensitive material

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2592243A (en) * 1948-10-30 1952-04-08 Eastman Kodak Co Method of selectively exposing the grains of a mixed grain photographic emulsion
US2703282A (en) * 1950-12-14 1955-03-01 Eastman Kodak Co Increasing the exposure latitude of photographic emulsions by sensitizing
US3628960A (en) * 1967-04-21 1971-12-21 Agfa Gevaert Nv Light sensitive halide material with variable contrast
US4351898A (en) * 1978-01-03 1982-09-28 Goldberg Richard J Mixed grain single emulsion layer photographic material
US4433048A (en) * 1981-11-12 1984-02-21 Eastman Kodak Company Radiation-sensitive silver bromoiodide emulsions, photographic elements, and processes for their use
US4439520A (en) * 1981-11-12 1984-03-27 Eastman Kodak Company Sensitized high aspect ratio silver halide emulsions and photographic elements
US5536624A (en) * 1994-06-02 1996-07-16 Mitsubishi Paper Mills, Ltd. Silver halide photographic photosensitive material
US5624792A (en) * 1994-06-02 1997-04-29 Mitsubishi Paper Mills Limited Silver halide photographic photosensitive material

Also Published As

Publication number Publication date
GB540444A (en) 1941-10-17
FR943627A (fr) 1949-03-14

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