WO1995017702A1 - Silver chlorobromide photographic emulsion, preparation and use in reversal colour processes - Google Patents
Silver chlorobromide photographic emulsion, preparation and use in reversal colour processes Download PDFInfo
- Publication number
- WO1995017702A1 WO1995017702A1 PCT/EP1994/004130 EP9404130W WO9517702A1 WO 1995017702 A1 WO1995017702 A1 WO 1995017702A1 EP 9404130 W EP9404130 W EP 9404130W WO 9517702 A1 WO9517702 A1 WO 9517702A1
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- WO
- WIPO (PCT)
- Prior art keywords
- emulsion
- grains
- chloride
- photographic emulsion
- core
- Prior art date
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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
- 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
- G03C1/10—Organic substances
- G03C1/12—Methine and polymethine dyes
- G03C1/14—Methine and polymethine dyes with an odd number of CH groups
-
- 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
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
-
- 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
- G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising
-
- 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
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
- G03C2001/03511—Bromide content
-
- 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
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
- G03C2001/03517—Chloride content
-
- 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
- G03C1/035—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
- G03C2001/03535—Core-shell grains
Definitions
- the present invention concerns a silver halide emulsion for colour photography containing chemically and spectrally sensitised silver halide grains and having a structure with a core and at least one peripheral area (also referred to hereinafter as core-shell structure).
- core-shell structure also referred to hereinafter as core-shell structure.
- invention also concerns a process for obtaining such silver halide emulsions and their use in reversal colour
- One of the drawbacks of the known emulsions is that the sensitising dyes used to sensitise the emulsion spectrally, for example cyanine dyes, may cause a loss of the intrinsic sensitivity of the emulsion.
- This loss of sensitivity or desensitisation due to dyes is recognised in the prior art as being a problem and is mentioned, for example, in "The Theory of the Photographic Process", 4th Edition, Macmillan Publishing Co. Inc., page 265 et seq. Given the
- chloride content of the silver halide grains may increase the developability of these grains and enable a fast processing of the emulsion.
- the emulsions with a high chloride content, distributed in one or more phases or areas of the grain, are described in the prior art, for example in US patents 4 590 155 and 3 935 014, or in UK patent 1 027 146.
- chloride emulsions suffer from various deficiencies, such as insufficient stability or reduced sensitivity, compared with bromide or bromoiodide emulsions.
- chloride-containing emulsions which are able to exhibit an optimum
- the present invention provides a means to eliminate the phenomenon of desensitisation generally caused by some sensitising dyes, and enables these dyes to be used without causing the undesirable effects which might have been expected.
- one object of the present invention concerns a spectrally and chemically sensitised halide emulsion, comprising silver halide grains with a core and at least one shell, characterised in that these grains comprise from 1 to 50% molar chloride said chloride being localised in a peripheral area of the grains, said emulsion being further characterized in that which is practically free of iodide, a spectral sensitising dye being adsorbed on the said grains, the said spectral sensitizing dye corresponding to the formula: f
- Z 1 and Z 2 represent independently the atoms required to complete a benzoxazole radical, a naphthoxazole radical, a benzothiazole radical, a naphthothiazole radical, a
- benzimidazole radical or a naphthimidazole radical in which the aromatic cycles may be substituted by groups such as the alkyl, aryl, aralkyl, alkaryl, halogeno or cyano groups;
- suitable dyes according to the above formula (I) are as follows:
- Another object of the invention concerns a process for producing a chemically and spectrally sensitised silver halide photographic emulsion, the said process comprising the steps of a forming a silver halide core emulsion, (b) forming, at the periphery of this core emulsion, an
- emulsion which is (I) substantially free of iodide and (II) contains from 1 to 50% molar chloride, (c) effecting the chemical sensitization of said emulsion and, (d) during or after the chemical sensitisation, adsorbing, on the surface of the grains of the emulsion obtained, a sensitising dye as in above formula (II).
- the term "substantially free of iodide” means that the peripheral area of the grain can contain only a very small quantity of iodide, generally not above about 0.5% M.
- the emulsion of the invention makes it possible to compensate for the loss of sensitivity resulting from the desensitisation due to the dye and even to obtain an increase in sensitivity.
- the emulsion comprises a chlorohalide peripheral area or shell so that, the chloride is distributed on the periphery of the grain ; and in the peripheral area, the chloride content may vary abruptly or content, within the ranges previously mentioned.
- the chlorobromide shell of an emulsion according to the invention comprises from 1 to 50% molar chloride ; the shell preferably contains from 1 to 30% molar chloride and more preferably from 2 to 20% molar chloride based on the total silver in the grain.
- the emulsion of the present invention comprises silver halide grains containing a core and one or more shells, the composition of the halides being different in the core and the shell or shells.
- the peripheral area containing the chloride preferably represents a thickness greater than 100 A and less than 60% of the radius of the grain.
- chloride represents from 10 to 50% of the radius of the grain.
- the silver halide grains have the crystal habit generally used in silver halide photography; these are cubic,
- the core grains may consist of silver bromide, silver chloride, silver
- the maximum possible quantity of iodide is the quantity which can be accepted by the cubic crystal
- the grains preferably contain less than about 15% molar iodide. In conventional photographic applications, the iodide concentrations are generally below about 15% molar.
- the distribution of the iodide may be homogeneous (for example, resulting from precipitation by a continuous jet of iodide) or discrete, the structures resulting from a sudden addition of iodide during precipitation. The sudden addition of iodide during precipitation.
- the emulsions may comprise coarse, medium or fine silver halide grains, predominantly delimited by crystal planes [100] or [111], and they may be regular or irregular in shape, for example cubic or octahedral.
- the core grain emulsions may be prepared using various techniques, for example single-jet, double-jet or
- Modifying compounds may be present during the precipitation of the grains. Such compounds may be present in the reaction vessel initially or they may be added at the same time as one or more salts, in accordance with conventional operating methods.
- the modifying compounds such as the middle chalcogens (namely sulphur, selenium and tellurium), gold and the noble metals in Group VIII (for example, iridium), may be present during the precipitation of the halides, as described in Research Disclosure, Vol. 134, June 1975, Article 13452.
- An important characteristic of the invention is that the chloride is coprecipitated with another silver halide, so as to form a mixed phase of silver chlorohalide in the outer peripheral area of the grain. According to a
- the process of the invention consists of precipitating an emulsion with a bromide or bromoiodide core, and then coprecipitating a chlorobromide emulsion on the core emulsion, or else the bromide or bromoiodide core emulsion can first be shelled with a bromide emulsion which will itself be shelled by coprecipitating a chlorobromide emulsion.
- concentrations, and the number of moles precipitated as a function of time and of temperature largely depend on the type of emulsion in question and on the desired results, and will consequently be determined in each case by a person skilled in the art.
- the size of the emulsion grains is determined using a grain volume analyser and the determination is based on the principle of direct electrolytic reduction.
- a grain volume analyser is described by A Holland and A Feinerman in J. Applied Photo. Eng. 8, 165 (1982).
- Such an apparatus makes it possible to obtain a volume distribution of the size of the grains from which a mean distribution volume (V) can be calculated, and then an equivalent spherical diameter (ESD) and a standard deviation (SIGMA), Vi being the volume of a given grain and N being the number of grains counted.
- V mean distribution volume
- ESD equivalent spherical diameter
- SIGMA standard deviation
- COV coefficient of variation
- emulsions are preferably monodisperse, that is to say they have a narrow size distribution characterised, for example, by a coefficient of variation of less than 20% and preferably less than 10%.
- the emulsions according to the invention are intended for reversal colour processes.
- the chromogenic products generally comprise a support covered with at least three layers of silver halide emulsion, with which are associated one or more dye-forming couplers. Colour reversal
- processes are well known and generally comprise a first black and white development, a fogging stage, a chromogenic development and a bleaching/fixing stage.
- sensitiser such as those indicated in Research Disclosure No 308, December 1989, paragraph III. These sensitisers comprise, for example, active gelatin, as described by T H James, The Theory of the Photographic Process, 4th Edition, Macmillan; 1977, pages 67-76, or sulphur, selenium,
- the chemical sensitisation may optionally be effected in the presence of thiocyanates, preferably at concentrations between 2 ⁇ 10 -3 and 2% molar with respect to the total silver content, as described by Damschroder in US patent 2 642 361; sulphur-containing compounds of the type described in the US patents 2 521 926 of Lowe et al, 3 021 215 of Williams et al and 4 054 457 of Bigelow.
- chemical sensitisation can be effected in the presence of compounds which modify chemical sensitisation, that is to say
- sensitisation such as the azaindenes, azapyridazines, azapyrimidines and salts of benzothiazolium, and the sensitisers comprising one or more heterocyclic rings.
- finishing modifiers are described in the US patents 2 131 038 of Brooker et al, 3 411 914 of Dostes, 3 554 757 of Kuwabara et al, 3 565 631 of Oguchi et al and 3 901 714 of Oftedahl, in the Canadian patent 778 723 of Walworth and in Duffin, Photographic Emulsion Chemistry, Focal Press (1966), New York, pages 138-143.
- the emulsions may be sensitised by reduction - for example, with hydrogen, as described by Janusonis in US patent
- chloride or chlorobromide is sensitised using gold and/or sulphur.
- silver halide emulsions of the present invention are also present.
- spectral sensitising dyes as defined above, which have maximum absorption levels in the blue and minus blue portions, ie green and red in the visible spectrum.
- spectral sensitising dyes which improve the spectral response beyond the visible spectrum can be used.
- One or more spectral sensitising dyes can be used.
- Dyes are known which have maximum sensitisation at various wavelengths in the visible spectrum and a great variety of spectral sensitivity curve forms. The choice and the relative proportions of the dyes depend on the region of the spectrum where it is desired to obtain the sensitivity and on the desired spectral sensitivity curve form. Dyes with overlapping spectral sensitivity curves often make it possible to obtain, in combination, a curve in which the sensitivity at each wavelength of the area of overlap is approximately equal to or even greater than
- the final emulsion consists of octahedral grains having an equivalent spherical diameter of 1.135 micrometres and a total iodide content of 3% molar.
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is carried out for 20 minutes at 70°C using:
- the emulsion obtained is an octahedral sensitised bromide core-shell emulsion, having an equivalent spherical
- the total iodide content corresponds to 3% molar and the iodide content of the core corresponds to 9% molar.
- This bromide shell emulsion (emulsion E1) is used as a control.
- This nucleation is followed by a period of inactivity of 180 seconds.
- This period of inactivity is followed a period of initial growth lasting 34.3 minutes, during which 2.0 M/l of AgNO 3 , 1.82 M/l of NaBr and 0.18 M/l of KI are introduced, by accelerated double-jet precipitation, so as to produce a mixed phase of AgBrI while maintaining the temperature and the pAg at the same values as before.
- a total of 3.36 moles of silver halides are precipitated during this initial growth stage.
- the pAg is modified to a value of 7.0 using a solution of 2.0 M/l of AgNO 3 introduced over a period of 152 seconds.
- This pAg shift is followed by a hold period of 120 seconds.
- the hold period is followed by a final growth segment.
- the emulsion is then washed by a conventional flocculation process.
- the final emulsion consists of cubo-octahedral grains having an equivalent spherical diameter of 0.580 ⁇ m and a total iodide content of 3% molar.
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is carried out for 20 minutes at 70°C using:
- the emulsion obtained is a sensitised cubo-octahedral core-shell emulsion having an equivalent spherical diameter (used as a mean dimension of the grains) of 0.580 ⁇ m, and a volume coefficient of variation of 11.9%.
- the total iodide content corresponds to 3% molar and the iodide content of the core corresponds to 9% molar.
- This bromide shell emulsion (emulsion E2) is used as a control.
- the pAg is modified to a value of 7.0 using a solution of 2.0 M/l of AgNO 3 introduced over a period of 153 seconds. This pAg shift is followed by a hold period of 120 seconds. The hold period is followed by a final growth segment.
- the emulsion is then washed by a conventional flocculation process.
- the final emulsion consists of cubo-octahedral grains having an equivalent spherical diameter of 0.606 micrometres and a total iodide content of 3% molar.
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is carried out over a period of 20 minutes at 70°C using:
- the emulsion obtained (E3) is a cubo-octahedral core-shell emulsion containing 9% molar chloride in the shell, where the silver chloride and silver bromide are coprecipitated, and having an equivalent spherical diameter of 0.606 ⁇ m and a volume coefficient of variation of 11.6%.
- This initial growth is followed by an adjustment of the pAg to a value of 7.0, using a solution of 2.0 M/l of AgNO 3 introduced over a period of 153 seconds.
- This pAg shift is followed by a hold period of 120 seconds.
- the hold period of inactivity is followed by a final growth segment.
- a final growth segment is precipitated over a period of 20 minutes, during which 2.0 M/l of AgNP 3 , 1.70 M/l of NaBr and 0.3 M/l of NaCl are introduced by accelerated double-jet precipitation, while maintaining the temperature and the pAg at the same values as before.
- a total of 6.69 moles of silver halides are precipitated during this second growth stage.
- the emulsion is then washed by a conventional flocculation process.
- the final emulsion consists of octahedral grains having an equivalent spherical diameter of 0.630
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is effected for 20 minutes at 70°C using:
- the emulsion obtained (E4) is a cubo-octahedral core-shell emulsion containing 15% molar chloride in the shell, in which silver chloride and silver bromide have been
- This pAg shift is followed by a hold period of 120 seconds.
- the hold period is followed by a final growth segment.
- the emulsion is then washed by a conventional flocculation process.
- the final emulsion consists of cubo-octahedral grains having an equivalent spherical diameter of 0.620 micrometres and a total iodide content of 3% molar.
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is effected for 20 minutes at 70°C using:
- the emulsion obtained (E5) is a cubo-octahedral core-shell emulsion containing 25% molar chloride in the shell, in which silver chloride and silver bromide have been
- Samples of emulsions E1, E2, E3, E4 and E5 are applied using proportions of 8.07 mg/dm 2 of silver, 23.68 mg/dm 2 of gelatin and 16.15 mg/dm 2 of a magenta coupler (compound F) on a triacetate support. Each sample is then exposed for 1/100 of a second to a colour temperature equivalent to 5500° K through a Wratten R #9 filter and a neutral density filter, and the samples are then subjected to the Kodak E-6 R colour reversal process.
- population of AgBr microcrystals is effected by introducing 0.035 moles of AgNO 3 and NaBr by double-jet precipitation over a period of 70 seconds, using 0.5 M/l of reagents. An excess of bromide is maintained so as to obtain a pAg of 9.1 at a temperature of 60°C.
- a final growth segment is brought about over a period of 29 minutes, during which 2.0 M/l of AgNO 3 and 2.0 M/l of NaBr are introduced by double-jet precipitation while
- the emulsion is then washed by a conventional flocculation process.
- the final emulsion consists of cubo-octahedral grains having an equivalent spherical diameter of 1.135 micrometres and a total iodide content of 3% molar.
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is effected for 20 minutes at 70°C using:
- the green spectral sensitisation is carried out during the chemical sensitisation stage using a mixture of 125.7 mg of sensitising dye A per mole of Ag and 26.3 mg of sensitising dye B per mole of Ag.
- the emulsion obtained is an octahedral sensitised bromide core-shell emulsion having an equivalent spherical diameter (used as the mean dimension of the grains) of 1.135 ⁇ m, and a volume coefficient of variation of 7.1%.
- the total iodide content corresponds to 3% molar and the iodide content of the core corresponds to 9% molar.
- This bromide shell emulsion (emulsion E6) is used as a reference.
- population of AgBr microcrystals is effected by introducing 0.035 moles of AgNO 3 and NaBr by double-jet precipitation over a period of 70 seconds, using 0.5 M/l of reagents. An excess of bromide is maintained so as to obtain a pAg of 9.1 at a temperature of 60°C.
- the pAg is adjusted to 7.0 using a solution of 2.0 M/l of AgNO 3 introduced over a period of 156 seconds. This pAg shift is followed by a hold period of 60 seconds. The hold period is followed by a final growth segment.
- the emulsion is then washed by a conventional flocculation process.
- the final emulsion consists of octahedral grains having an equivalent spherical diameter of 1.107
- This emulsion is sensitised chemically and spectrally at a point determined as being the optimum position.
- the chemical sensitisation is effected for 20 minutes at 70°C using:
- a mixture of 166.0 mg of sensitising dye A per mole of Ag and 48.0 mg of sensitising dye B per mole of Ag is added during the chemical sensitisation stage for effecting green sensitisation.
- the emulsion obtained (E7) is a cubo-octahedral core-shell emulsion containing 15% molar chloride in the shell, in which silver chloride and silver bromide have been coprecipitated, and having an equivalent spherical diameter of 1.107 ⁇ m and a volume coefficient of variation of 6.2%.
- Example 6 The emulsions of Examples 7-8 are applied as a coating, exposed to light and process as described in Example 6. Similar results are observed to those of Example 6, ie emulsion E7 has greater sensitivity than emulsion E6, without having any appreciable effect on the contrast and granularity.
- EXAMPLE 10 The operating method of Example 8 is used again, except that dyes A and B are replaced by dye C.
- Dye D has the formula:
- Example 8 The operating method of Example 8 is used again, except that dyes A and B are replaced by dye E.
- Example 5 (Invention) 136 136 2.50 1.27 26.6
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95902794A EP0698229A1 (en) | 1993-12-23 | 1994-12-13 | Silver chlorobromide photographic emulsion, preparation and use in reversal colour processes |
JP7517147A JPH08508113A (en) | 1993-12-23 | 1994-12-13 | Silver chlorobromide photographic emulsion, its preparation and its use in reversal color processing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR93/15770 | 1993-12-23 | ||
FR9315770A FR2714493B1 (en) | 1993-12-23 | 1993-12-23 | Photographic emulsion with silver chlorobromide, preparation and use in color invertible processes. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995017702A1 true WO1995017702A1 (en) | 1995-06-29 |
Family
ID=9454494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1994/004130 WO1995017702A1 (en) | 1993-12-23 | 1994-12-13 | Silver chlorobromide photographic emulsion, preparation and use in reversal colour processes |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0698229A1 (en) |
JP (1) | JPH08508113A (en) |
FR (1) | FR2714493B1 (en) |
WO (1) | WO1995017702A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1367941A (en) * | 1962-09-01 | 1964-07-24 | Agfa Ag | photographic silver halide emulsion containing composite silver halide grains having an extremely narrow particle size distribution |
GB1027146A (en) * | 1962-09-01 | 1966-04-27 | Agfa Ag | Photographic silver halide emulsion |
US4693965A (en) * | 1984-12-03 | 1987-09-15 | Fuji Photo Film Co., Ltd. | Method for manufacturing a silver halide emulsion |
DE3931629A1 (en) * | 1989-09-22 | 1991-04-04 | Agfa Gevaert Ag | SILVER HALOGENIDE EMULSION AND PHOTOGRAPHIC MATERIAL |
US5141846A (en) * | 1990-10-18 | 1992-08-25 | Polaroid Corporation | Method for preparing photographic emulsion |
WO1993010482A2 (en) * | 1991-11-12 | 1993-05-27 | International Paper Company | Photographic emulsions and materials with reduced pressure sensitivity |
-
1993
- 1993-12-23 FR FR9315770A patent/FR2714493B1/en not_active Expired - Fee Related
-
1994
- 1994-12-13 EP EP95902794A patent/EP0698229A1/en not_active Withdrawn
- 1994-12-13 WO PCT/EP1994/004130 patent/WO1995017702A1/en not_active Application Discontinuation
- 1994-12-13 JP JP7517147A patent/JPH08508113A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1367941A (en) * | 1962-09-01 | 1964-07-24 | Agfa Ag | photographic silver halide emulsion containing composite silver halide grains having an extremely narrow particle size distribution |
GB1027146A (en) * | 1962-09-01 | 1966-04-27 | Agfa Ag | Photographic silver halide emulsion |
US4693965A (en) * | 1984-12-03 | 1987-09-15 | Fuji Photo Film Co., Ltd. | Method for manufacturing a silver halide emulsion |
DE3931629A1 (en) * | 1989-09-22 | 1991-04-04 | Agfa Gevaert Ag | SILVER HALOGENIDE EMULSION AND PHOTOGRAPHIC MATERIAL |
US5141846A (en) * | 1990-10-18 | 1992-08-25 | Polaroid Corporation | Method for preparing photographic emulsion |
WO1993010482A2 (en) * | 1991-11-12 | 1993-05-27 | International Paper Company | Photographic emulsions and materials with reduced pressure sensitivity |
Also Published As
Publication number | Publication date |
---|---|
FR2714493A1 (en) | 1995-06-30 |
FR2714493B1 (en) | 1996-04-19 |
JPH08508113A (en) | 1996-08-27 |
EP0698229A1 (en) | 1996-02-28 |
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