US2220187A - Filter layer for photographic color films and plates - Google Patents

Filter layer for photographic color films and plates Download PDF

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Publication number
US2220187A
US2220187A US120934A US12093437A US2220187A US 2220187 A US2220187 A US 2220187A US 120934 A US120934 A US 120934A US 12093437 A US12093437 A US 12093437A US 2220187 A US2220187 A US 2220187A
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US
United States
Prior art keywords
layer
silver
filter layer
layers
color
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Expired - Lifetime
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US120934A
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English (en)
Inventor
Wilmanns Gustav
Schneider Wilhelm
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GAF Chemicals Corp
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General Aniline and Film Corp
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Publication date
Application filed by General Aniline and Film Corp filed Critical General Aniline and Film Corp
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Publication of US2220187A publication Critical patent/US2220187A/en
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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
    • G03C1/00—Photosensitive materials
    • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
    • G03C1/825—Photosensitive materials characterised by the base or auxiliary layers characterised by antireflection means or visible-light filtering means, e.g. antihalation

Definitions

  • One of its objects is a photographic color film 5 or plate containing a filter layer prepared from colloidal silver. Another object is a process of preparing such photographic color films and plates. Further objects will be seen from the detailed specification following hereafter.
  • sub- 30 stantive dyestufis which are nullified by the reversal bath, may be used without special disadvantage. These dyestuffs are not applicable, however, if by color development before the use of the bleaching-bath a dyestuif picture is pro- 35 cuted, because by the usual vigorous reducing baths, for example chromic acid or potassium permanganate, these dyestufi pictures are destroyed or at least seriously damaged.
  • This invention relates to a process, whereby I 40 filter layers are obtained which fulfill all requirements, that is to say which are in all cases in which they are contacted or connected with a silver halide emulsion layer fast to diffusion and photographically indifierent, by dispersing 5 in gelatin colloidal 'silver in suitable degree of dispersing and using this gelatin as the filter layer. In this manner bright yellow to gametred filters are obtained by observing known condltions.
  • Such filter layers are absolutely free from diffusion and cannot in any case damage the emulthe silver is removed by any desired solvent for silver without damaging the dyestufi.
  • the layers are made by producing a silversol of suitable color, for example by reducing silver nitrate in an alkaline medium by means of an organic reducing agent, such as dextrin, ferrous citrate or hydroquinone, and pouring this into the gelatin solution.
  • the quantity of silver used is about 30 grams AgNOs per 1 kilogram of emulsion.
  • the gelatin solution is then allowed to solidify, cut into strips and. the inorganic or organicsoluble compounds washed out of it. There remains in the gelatin only the pure colloidal silver.
  • Such gelatin solutions can be applied to the support in the usual manner, which support may be cast or not cast.
  • A'light-sensitive color material carrying afilter layer according to the invention is composed for instance as shown in the drawing and comprises a support on which is poured a panchromatic light-sensitive layer containing a component for a blue-green dyestuff, on this is cast an orthochromatic light-sensitive layer containing a color-forming component of a red dyestuff.
  • the filter layer described by the present invention containing colloidal silver, the grain size of which is suitably adjusted in such a way that only the blue part of the light is absorbed.
  • an unsensitized emulsion containing a color-forming component of a blue dyestuff.
  • Such a film afterthe exposure sion which lies above or below them.
  • the filter layer containin colloidal silver is poured, the grain size of the colloidal silver is chosen in such a way that the absorption of the filter is adjusted according to the sensitivity oi. the light-sensitive layer so that it is possible to adjust the exposure conditions as it is desired for instance for artificial or day-light.
  • the difierent degrees of dispersion oi the silver particles in the colloid layers are obtained according to known methods. Such methods are for instance described in Kolloides Silber" by Carey Lea 1908. It is also possible to influence the size of the silver particles and consequently the color of the filter layers to be prepared by the addition of electrolytes. Such processes are described for instance in Encyklopiidie der Photographic, Heft 58, Photographische cucumber by Dr. Liippo Cramer.
  • a light-sensitive element for color photography comprising a base, a plurality of differently sensitized light-sensitive gelatino-silver halide emulsions on said base, a filter-layer interposed between two such layers, said filter layer comprising colloidal silver dispersed in a gelatine emulsion, the amount of silver to emulsion being on the order of that represented by 30 21'. of silver nitrate to 1000 gr.
  • said filter layer having a color ranging from bright yellow to garnet-red, the size of the colloidal silver particles in said layer being such that said filter layer absorbs light rays in the region to which the layer preceding it is sensitized and transmits light rays in the region to which the layer succeeding it is sensitized.
  • a light-sensitive element for color photography comprising a support and a plurality of diil'erently sensitized silver halide emulsion layers, each of the layers containing a dyestufl component capable of being developed by a color 'iorming developing process, two of said lightsensitive layers being separated by a filter layer comprising colloidal silver dispersed in a gelatine emulsion, the amount or silver to emulsion being on the order of that represented by 30 81. of silver nitrate to 1000 gr.
  • said layer having a color ranging from bright yellow to garnet-red, the size of the colloidal silver particles in said layer being such that said filter layer absorbs light rays in the region to which the layer preceding it is sensitized and transmits light rays in the region to which the layer succeeding it is sensitized.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US120934A 1936-01-18 1937-01-16 Filter layer for photographic color films and plates Expired - Lifetime US2220187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2220187X 1936-01-18

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US2220187A true US2220187A (en) 1940-11-05

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US120934A Expired - Lifetime US2220187A (en) 1936-01-18 1937-01-16 Filter layer for photographic color films and plates

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BE (1) BE419446A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511112A (en) * 1945-09-12 1950-06-13 Du Pont Process for obtaining color separations from multilayer photographic film
US2571688A (en) * 1946-11-29 1951-10-16 Ilford Ltd Production of colloidal silver
US2927052A (en) * 1953-03-20 1960-03-01 Us Movidyn Corp Process of producing oligodynamic metal biocides
US3945829A (en) * 1973-07-19 1976-03-23 Agfa-Gevaert Aktiengesellschaft Color photographic multilayer material with improved color density
US4040829A (en) * 1974-06-04 1977-08-09 Fuji Photo Film Co., Ltd. Multilayer multicolor photographic materials

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511112A (en) * 1945-09-12 1950-06-13 Du Pont Process for obtaining color separations from multilayer photographic film
US2571688A (en) * 1946-11-29 1951-10-16 Ilford Ltd Production of colloidal silver
US2927052A (en) * 1953-03-20 1960-03-01 Us Movidyn Corp Process of producing oligodynamic metal biocides
US3945829A (en) * 1973-07-19 1976-03-23 Agfa-Gevaert Aktiengesellschaft Color photographic multilayer material with improved color density
US4040829A (en) * 1974-06-04 1977-08-09 Fuji Photo Film Co., Ltd. Multilayer multicolor photographic materials

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