US2362599A - Color photography - Google Patents

Color photography Download PDF

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Publication number
US2362599A
US2362599A US457869A US45786942A US2362599A US 2362599 A US2362599 A US 2362599A US 457869 A US457869 A US 457869A US 45786942 A US45786942 A US 45786942A US 2362599 A US2362599 A US 2362599A
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US
United States
Prior art keywords
layer
coupler
color
dye
layers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US457869A
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English (en)
Inventor
Paul W Vittum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to FR956747D priority Critical patent/FR956747A/fr
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US457869A priority patent/US2362599A/en
Application granted granted Critical
Publication of US2362599A publication Critical patent/US2362599A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03C7/3029—Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function

Definitions

  • This invention relates to a multi-layer material for color photography.
  • Multi-layer materials in which a coupler compound capable of coupling with the oxidation product of an aromatic amino developing agent is dissolved in a water-insoluble solvent and the v solution dispersed in the emulsion layer have been described in Mannes and Godowskv U Patents 2,304,939 and 2,304,940 granted December 15, 1942,. and in J elley and Vittum U. S. Patent 2,322,027, granted June 15, 1943. It has been established that these processes which yield final dye images consisting of highly dispersed dye coupler itself may be unstable under severe condltions and decompose to yield dark colored products which reduce the value of the picture.
  • a further object is to provide a method for obtaining'the, inherent advantage of color pictures produced tram dyes in dispersed solution in the gelatin while overcoming the disadvantages of the presence of residual coupler in the top layer of the material.
  • a still further object is to provide a method for processing a multi-layer material having dispersed couplers in the lower layers and no coupler in the top emulsion layer.
  • the normal dye images are produced in the lower layers of a multi-layer material by a single development step and the dye image is produced in the top emulsion layer either at the same time or at an earlier or later time by a separate development step.
  • This method permits the use of a material which contains no coupler in the top layer, and, therefore, no residual coupler is present in the layer.
  • couplers of the acyl acetanilide type customarily employed for the formation of a yellow dye image
  • the presence of the residual coupler is especially objectionable. It has been found that while the yellow dye is relatively quite fast to light, the presence of small amounts of unused coupler renders the dye image in this layer much less stable to light.
  • the red-sensitive layer is customarily, nearest the support, the green-sensitive layer in the middle and the blue-sensitive layer outermost.
  • a yellow filter layer is customarily placed between the top and middle emulsion layers or the filter material maybe in the top layer itself.
  • the red-sensitlve and green-sensitive layers would contain dispersed particles of coupler and solvent therefor such as described in Mannes and Godowsky U. S. Patent. 2,304,940 or Jelley and Vittum U. S.
  • Patent 2,322,027 After exposure of such a material, the top emulsion layer is developed first by a developing solution containing the desired controlled by proper timing or by the use of loading agents in the solution.
  • Asuitable de-' veloping solution is as follows: A. 2-amino-5-diethylamino toluene HCl Isoproply alcohol do-- 100 For use, B is addedto A.
  • This developer may have the following composition:
  • the material described in A is developed in the normal color developer containing no coupler such as that referred to in A to yield silver and dye images in'the lower emulsion layers and to produce a silver image only in the top layer.
  • the unused silver halide in the material is then fixed out and the silver in the top layer or in all of the layers is rehalogenized in a well known manner.
  • the material is then treated with a color developing solution containing the desired coupler which forms the dye image in the top layer alone.
  • This solution may havethe following composition:
  • a coupler may be used which is so constituted that its diffusion into the film is I slow and controllable.
  • 'A yellow coupler of this type is p-benzeneazoacetoacetanilide.
  • the slowly diffusing coupler can be added directly to the color developer and the upper dye image produced from the coupler in the solution, and the lower dye images produced from the coupiers in the layers in a single developning operation.
  • solvents produce liduid dispersions of the dye in the emulsion layer.
  • Mixtures of two or more solvents may be used in some cases or it may be desirable to add to the solvent another ingredient such as a cellulose derivative or natural or synthetic resin to reduce the fluidity of the solvent, to change its refractive index or for some other purpose.
  • the top emulsion layer containing the dispersed solvent for the dye may be produced as follows:
  • a mixture of 20 grams of n-butylphthalate and 20 cc. of ethylacetate is added to 200 cc. of water containing 1 gram of sodium lauryl sulfate.
  • Any suitable primary aromatic amino developing agent may be used in my process such as diethyl p phenylenediamine hydrochloride,
  • the top layer can be developed in a developing solution containing the slowly diffusing coupler and the bottom layers-developed subsequently in a developing solution containing no coupler.
  • a coupler which has a relatively low rate of reaction with theoxidized developer as monomethyl pphenylenediamine hydrochloride, 2-amino-5-diethylaminotoluene hydrochloride, and dimethyl-p-phenylenediamine sulfate. These compounds have an unsubstituted amino group which enables the oxidation product of the developer to couple with the color-forming compounds.
  • My process maybe used for the production of colored photographic images in layers of gelatin or other carrier such as collodion or an organic acid ester of cellulose.
  • the carrier for the sensitive material may besupported by glass or a flexible film such as cellulose nitrate or cellulose acctate.
  • the emulsion layers may also be coated which difluses only through the top layer in the on an opaque support such as paper or pigmented cellulose ester.
  • the method of producing a natural-color image in a multi-layer photographic material at least one lower layer of which is a silver halide layer containing dispersed particles of a solution of color-former and a water-permeable, waterinsoluble solvent for the color-former, and the top layer of which is a silver halide layer free or color-forming material, which comprises exposing both layers or said material and developing them in a color-tor developer containing a coupler time required to develop all of the layers.
  • the method of producing a natural-color image in a multi-layer photographic material at least one lower layer of which is a silver halide layer containing dispersed particles of a solution of color-former and a water-permeable, waterinsoluble solvent for the color-former, and the top layer of which is a blue-sensitive silver halide layer free of color-forming material, which comprises exposingthe sensitive layers of said material and developing them in a color-forming developer containing a coupler which diduses only through the top layer and which produces a yellow image therein in the time required to develop all of the layers.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US457869A 1942-09-10 1942-09-10 Color photography Expired - Lifetime US2362599A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR956747D FR956747A (enrdf_load_html_response) 1942-09-10
US457869A US2362599A (en) 1942-09-10 1942-09-10 Color photography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US457869A US2362599A (en) 1942-09-10 1942-09-10 Color photography

Publications (1)

Publication Number Publication Date
US2362599A true US2362599A (en) 1944-11-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
US457869A Expired - Lifetime US2362599A (en) 1942-09-10 1942-09-10 Color photography

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US (1) US2362599A (enrdf_load_html_response)
FR (1) FR956747A (enrdf_load_html_response)

Also Published As

Publication number Publication date
FR956747A (enrdf_load_html_response) 1950-02-06

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