US3772033A - Super-sensitized phothographic silver halide material - Google Patents

Super-sensitized phothographic silver halide material Download PDF

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Publication number
US3772033A
US3772033A US00203367A US3772033DA US3772033A US 3772033 A US3772033 A US 3772033A US 00203367 A US00203367 A US 00203367A US 3772033D A US3772033D A US 3772033DA US 3772033 A US3772033 A US 3772033A
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United States
Prior art keywords
silver halide
dye
emulsion
lower alkyl
styryl
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Expired - Lifetime
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US00203367A
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English (en)
Inventor
G Ficken
E Squire
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Ilford Imaging UK Ltd
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Ilford Ltd
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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
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/28—Sensitivity-increasing substances together with supersensitising substances
    • G03C1/29—Sensitivity-increasing substances together with supersensitising substances the supersensitising mixture being solely composed of dyes ; Combination of dyes, even if the supersensitising effect is not explicitly disclosed

Definitions

  • ABSTRACT A photographic silver halide emulsion comprising a super-sensitising combination consisting of a sensitising dye of the formula where R is a lower alkyl radical, R R R R R R and R are each selected from hydrogen and halogen atoms and lower alkyl or alkoxy radicals, R is a lower alkyl radical and Z is an alkylene radical, together with a styryl base of the formula:
  • Photographic silver halide emulsions have a certain natural sensitivity to light but this is restricted to a short range of wavelengths in the ultraviolet and/or blue regions of the spectrum.
  • the effect of incorporating a sensitising dye is to impart to the emulsion sensitivity to light of other wavelengths. It has been known for some years that by incorporating in the emulsion, together with the sensitising dye, a second substance which may or may not itself be a sensitising dye, there may sometimes be imparted to the emulsion an additional sensitivity beyond that which can be regarded as the sum effect of the separate substances. Combinations of sensitising dye and other substances which give this better result are known as supersensitising combinations. Examples of such supersensitising combinations e.g. of certain acid carbocyanine dyes and styryl bases are given in U.S. Pat. No. 2,533,426.
  • the present invention is based on the discovery of a supersensitising combination of certain acid carbocyanine dyes and certain styryl bases which yield, in some respects, superior results to the combinations described in U.S. Pat. No. 2,533,426.
  • a photographic silver halide emulsion which comprises a supersensitising combination which consists of a sensitising dye of the formula I:
  • R is a lower alkyl radical
  • R R R R R R R R and R are each selected from hydrogen and halogen atoms and lower alkyl or alkoxy radicals
  • R is alower alkyl radical
  • Z is an alkylene radical, together with a styryl base of the formula II:
  • R and R are each lower alkyl radicals.
  • lower alkyl or alkoxy radicals are meant radicals having one to four carbon atoms. 7
  • D represents the atoms necessary to complete a thiazole, benzothiazole, benzimidazole or benzoxazole ring system.
  • EXAMPLE 1 The above Dye A and the styryl bases, 1, 2 and 3 were added to high speed silver iodobromide emulsion containing -5.4 mol per cent of silver iodide, after digestion of the emulsion, the quantity shown for each compound being the amount per 1% g mols of silver halide.
  • the emulsion was divided into portions, each portion was coated onto a film strip. After exposure the strips were developed and the relative log speed of the emulsions were determined. The speeds are relative log speeds measured to light passing through a suitable filter, the term relative log speed being directly related to the logarithm of the reciprocal of the exposure in metre-candle-seconds required to produce a density of 0.1 above fog. A higher figure indicates a higher speed.
  • the filters used were minus blue, No. 1 l0 and the tricolour red, No. 204 of the llford Colour Filters handbook.
  • Styryl base mg. llfiielative log speeds inus blue red EXAMPLE 2 before digestion.
  • EXAMPLE 3 The method of testing of Example 1 was used, except that the dye was added before digestion of the emulsion and the styryl base after digestion.
  • the dyes used were dyes C and D as hereinbefore set forth and styryl bases 4 and 5 as hereinbefore set forth.
  • the dye described in U.S. Pat. No. 2,533,426 was anhydro-( l-ethyl-Z-quinoline) (5-chloro-3-2 sulphoethyl-2-benzothiazole)trimethincyanine hydroxide. This is hereinafter designated dye j.
  • the emulsions containing the dye and styryl base combinations were prepared as in Example 2, i.e. both the dye and the styryl base were added to the emulsion before the digestion thereof.
  • the supersensitising combinations used in the present invention sensitise the emulsion beyond 700 nm while the supersensitising combinations described in U. S. Pat. No. 2,533,426 do not extend the spectral sensitivity of the emulsions beyond about 670 nm.
  • the comparative wedge spectrograms of two of the combinations compared above is shown in the accompanying diagram.
  • a photographic silver halide emulsion which contains a super-sensitizing dye of the formula:
  • D represents the atoms necessary to complete a thiazole, benzothiazole, benzimidazole or benzoxazole ring system and R and R are each lower alkyl radicals.
  • a photographic silver halide emulsion according to claim 1 wherein from 0.01 to 0.5 g of the sensitising dye is present per 1.5 g moles of silver present in the emulsion.
  • a photographic silver halide emulsion according to claim 1 wherein from 0.005 to 0.1 g of the styryl base is present per 1.5 g moles of silver present in the emulsion.
  • a photographic silver halide emulsion according to claim 1 wherein from 0.01 to 0.5 g of the sensitizing dye and from 0.005 to 0.1 g of the styryl base each is present per 1.5 g moles of silver present in the emulsion.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US00203367A 1970-12-01 1971-11-30 Super-sensitized phothographic silver halide material Expired - Lifetime US3772033A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5707870 1970-12-01

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US3772033A true US3772033A (en) 1973-11-13

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US00203367A Expired - Lifetime US3772033A (en) 1970-12-01 1971-11-30 Super-sensitized phothographic silver halide material

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US (1) US3772033A (ref)
BE (1) BE776011A (ref)
DE (1) DE2159319A1 (ref)
FR (1) FR2114967A5 (ref)
GB (1) GB1317036A (ref)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885972A (en) * 1971-12-22 1975-05-27 Agfa Gevaert Ag Supersensitized direct positive photographic silver salt emulsions
US5478720A (en) * 1993-04-01 1995-12-26 Konica Corporation Silver halide photographic emulsion and silver halide photographic light-sensitive material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313922A (en) * 1938-07-08 1943-03-16 Eastman Kodak Co Photographic emulsion
US2316268A (en) * 1938-11-24 1943-04-13 Gen Aniline & Film Corp Photographic emulsion
US2533426A (en) * 1948-10-13 1950-12-12 Eastman Kodak Co Photographic emulsions sensitized with supersensitizing combinations of acid carbocyanine dyes and styryl bases
US3672898A (en) * 1969-09-29 1972-06-27 Eastman Kodak Co Multicolor silver halide photographic materials and processes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2313922A (en) * 1938-07-08 1943-03-16 Eastman Kodak Co Photographic emulsion
US2316268A (en) * 1938-11-24 1943-04-13 Gen Aniline & Film Corp Photographic emulsion
US2533426A (en) * 1948-10-13 1950-12-12 Eastman Kodak Co Photographic emulsions sensitized with supersensitizing combinations of acid carbocyanine dyes and styryl bases
US3672898A (en) * 1969-09-29 1972-06-27 Eastman Kodak Co Multicolor silver halide photographic materials and processes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885972A (en) * 1971-12-22 1975-05-27 Agfa Gevaert Ag Supersensitized direct positive photographic silver salt emulsions
US5478720A (en) * 1993-04-01 1995-12-26 Konica Corporation Silver halide photographic emulsion and silver halide photographic light-sensitive material

Also Published As

Publication number Publication date
DE2159319A1 (de) 1972-06-29
BE776011A (fr) 1972-05-30
GB1317036A (en) 1973-05-16
FR2114967A5 (ref) 1972-06-30

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