US3656961A - Direct positive silver halide photographic light-sensitive elements - Google Patents

Direct positive silver halide photographic light-sensitive elements Download PDF

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Publication number
US3656961A
US3656961A US1302A US3656961DA US3656961A US 3656961 A US3656961 A US 3656961A US 1302 A US1302 A US 1302A US 3656961D A US3656961D A US 3656961DA US 3656961 A US3656961 A US 3656961A
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US
United States
Prior art keywords
silver halide
sensitive
light
direct positive
emulsion
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
US1302A
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English (en)
Inventor
Yoshihide Hayakawa
Hideo Kawano
Hirotetu Kato
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.)
Fujifilm Holdings Corp
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Fuji Photo Film Co Ltd
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Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
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Publication of US3656961A publication Critical patent/US3656961A/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
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/485—Direct positive emulsions
    • G03C1/48515—Direct positive emulsions prefogged
    • G03C1/48523—Direct positive emulsions prefogged characterised by the desensitiser

Definitions

  • ABSTRACT A light-sensitive, direct positive, photographic silver halide element comprising a support having thereon a silver halide emulsion layer containing a salt selected from the group consisting of a soluble salt and a complex salt of a metal belonging to Group 8 of the periodic table and a condensed polycyclic quinone compound.
  • the present invention relates to a direct positive photographic silver halide element. More particularly, it relates to a light-sensitive, direct positive, photographic silver halide element capable of providing direct positive images having low residual minimum density, a wide exposure latitude and a high contrast by only one exposure and one development.
  • a light-sensitive, direct positive, photographic silver halide element is a photographic element wherein, as the amount of exposure applied to the element increases, the optical density of the image formed thereon after development'is reduced. It is well known that by adding a desensitizing agent to the photographic silver halide emulsion during the preparation of the photographic light-sensitive element, the reversal sensitivity speed is markedly increased.
  • the above-mentioned occurrence of the inferior image quality is caused by the fact that a negative image is formed by a so-called re-reversal phenomenon, thatis, a phenomenon wherein as the amount of exposure increases, the optical density of the formed images after development is increased again over the minimum value and the negative image thus formed is superposed on the positive image.
  • a so-called re-reversal phenomenon thatis, a phenomenon wherein as the amount of exposure increases, the optical density of the formed images after development is increased again over the minimum value and the negative image thus formed is superposed on the positive image.
  • an object of the present invention is to provide a light-sensitive, direct positive, photographic silver halide element having a wide exposure latitude and being capableof providing hard direct positive images having high contrast.
  • a salt of a metal belonging to Group 8 of the periodic table and a condensed polycyclic quinone are incorporated into the photographic lightsensitive emulsion.
  • the metals belongingto Group 8 of the periodic table which may be employed in the present invention include rhodium, iridium, ruthenium, palladium, osmium, cobalt, and platinum.
  • the metals may be employed in the formof water-soluble naphthoquinone, anthraquinone, phenanthraquinone, and
  • the photographic silver halide emulsion to which the aforesaid compounds are added consists of a protective colloid such as gelatin or a hydrophilic organic colloid having dispersed therein silver chloride, silver chlorobromide, silver bromide, silver iodobromide, silver chlorobromide, or silver chloroiodobromide.
  • a protective colloid such as gelatin or a hydrophilic organic colloid having dispersed therein silver chloride, silver chlorobromide, silver bromide, silver iodobromide, silver chlorobromide, or silver chloroiodobromide.
  • the above-mentioned salt of the Group 8 metal is incorporated in the aforesaid silver halide photographic emulsion during the emulsification of the silver halide or during physical ripening of the photographic emulsion.
  • the preferable amount of the metal salt to be added is from 1 X 10 mole to l X 10 mole, particularly from 1 X 10 mole to l X 10 mole, per 1 mole of silver halide.
  • the amount of the condensed polycyclic quinone to be used with the above-mentioned metal salt depends upon the nature of the polycyclic quinone and silver halide emulsion to be employed but is preferably from 5 mg. to 500 mg. per 1 mole of silver halide.
  • the condensed polycyclic quinone may be added in the silver halide emulsion at any stage but is most preferably added thereto at a stage after the completion of the formation of fogged nuclei and before coating.
  • the condensed polycyclic quinone may be added to the photographic silver halide emulsion while dissolved in a solvent that has no deleterious effect on the emulsion, such as water, a lower alcohol having from one to five carbon atoms, or a ketone.
  • a solvent that has no deleterious effect on the emulsion such as water, a lower alcohol having from one to five carbon atoms, or a ketone.
  • the direct reversal silver halide photographic light-sensitive element ofthe present invention may be prepared in the following manner.
  • a silver halide emulsion is prepared according to a conventional method of precipitation and physical ripening, fon'ning fogged nuclei in the silver halide emulsion by exposing or by alkalifying the silver halide emulsion and adding thereto a reducing agent such as formaldehyde, hydrazine, a divalent tin salt, thiourea dioxide, or an amine compound.
  • the emulsion is applied to a suitable support, after adding thereto the aforesaid metal salt and the condensed polycyclic quinone together with, if necessary, the abovementioned desensitizing agent.
  • the support may be a cellulose acetate film, a polyethylene terephthalate film, a barytacoatedpaper, a synthetic paper, or a waterproof paper.
  • ordinary photographic additives such as hardening agents, surface active agents, and sen- EXAMPLE l To a 10 percent aqueous gelatin solution were added simultaneously an aqueous solution containing g. of silver nitrate and an aqueous solution containing 30 g.
  • photographic silver halide emulsions were prepared in a similar manner as above except that no rhodium salt was added.
  • Each of the photographic silver halide emulsions prepared above was coated on a cellulose trlacetate film and dried.
  • the light sensitive, direct positive, photographic films prepared above were exposed through an optical wedge to a tungsten lamp' of 2,660 K. and developed for 3 minutes at 20 C. in a developer having the following composition:
  • the contrast shown in the above table is the mean gradient between point 1 (base density of characteristic curve fog density density 0.1) and point 2 (base density of characteristic curve fog density density 2.1).
  • the exposure latitude in the above table is shown by the difference (log E log E,) between logarithms of the exposure amount log E giving (base density fog density density 2.1) ofthe negative image portion, and the exposure amount log E giving (base density fog density density 2.1)ofthe positive image portion.
  • EXAMPLE 2 To a 10 percent aqueous gelatin solution were added, simultaneously, an aqueous solution containing 100 g. of silver nitrate and an aqueous solution containing 30 g. of sodium chloride, 20 g. of potassium bromide, and 10 mg. of iridium chloride, to thereby form fine silver halide particles. Thereafter, 1 g. of potassium iodide and 40 g. of gelatin were added to the silver halide emulsion and the pH of the resultant emulsion was adjusted to 9.5 with sodium carbonate.
  • Each of the photographic silver halide emulsions thus prepared was coated on a polyethylene terephthalate film and dried.
  • the light-sensitive films thus prepared were exposed and developed as in Example 1.
  • the results (the minimum density, contrast and the exposure latitude) are shown in Table 4.
  • Emulsion Iridium Z-chloro- Pinakryptol No. chloride anthraquinone yellow 1 0 0 2 0 200 0 3 0 100 50 4 20 0 0 5 20 0 100 6 20 200 0 7 20 100 50 TABLE 4 Test Minimum density Contrast Exposure Latitude No.
  • a light-sensitive, direct positive, photographic silver halide element comprising a support having thereon a silver halide emulsion layer containing a soluble nitrate, halide, or a complex salt of a metal selected from the group consisting of rhodium, iridium, ruthenium, palladium, osmium, cobalt and platinum, and
  • a MX represents an alkali metal or a hydrogen atom
  • M represents rhodium, iridium, ruthenium, palladium, osmium, cobalt or platinum
  • X represents a halogen atom
  • condensed polycyclic quinone is selected from the group consisting of sodium anthraquinone, a-naphthoquinone, 2-chloroanthraquinone, sodium anthraquinone- B -sulfonate, 1,5-dichloroanthraquinone, and l,2-benzanthraquinone.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US1302A 1969-01-25 1970-01-07 Direct positive silver halide photographic light-sensitive elements Expired - Lifetime US3656961A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP558269 1969-01-25

Publications (1)

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US3656961A true US3656961A (en) 1972-04-18

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US1302A Expired - Lifetime US3656961A (en) 1969-01-25 1970-01-07 Direct positive silver halide photographic light-sensitive elements

Country Status (5)

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US (1) US3656961A (fr)
BE (1) BE743560A (fr)
DE (1) DE2003037B2 (fr)
FR (1) FR2029089A1 (fr)
GB (1) GB1234741A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3847619A (en) * 1972-11-20 1974-11-12 Eastman Kodak Co Ion-paired cobaltic complexes and photographic elements containing same
US3856524A (en) * 1971-10-14 1974-12-24 Eastman Kodak Co Photographic elements and processes for providing tanned image records
US3867149A (en) * 1972-05-04 1975-02-18 Konishiroku Photo Ind Fogged, direct-positive silver halide photographic material containing a rhodium salt desensitizer and a bispyrazolone dye stabilizer
US4395483A (en) * 1979-04-27 1983-07-26 Fuji Photo Film Co., Ltd. Direct positive type silver halide photosensitive material
US5240828A (en) * 1989-12-22 1993-08-31 Eastman Kodak Company Direct reversal emulsions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761276A (en) * 1971-03-10 1973-09-25 Eastman Kodak Co Photographic element containing monodispersed unfogged silver halide grains chemically sensitized internally and externally
GB1427525A (en) * 1972-07-13 1976-03-10 Agfa Gevaert Directpositive silver halide emulsions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717833A (en) * 1952-05-12 1955-09-13 Sperry Rand Corp Direct positive emulsions
US3035917A (en) * 1958-11-12 1962-05-22 Ilford Ltd Direct positive emulsions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717833A (en) * 1952-05-12 1955-09-13 Sperry Rand Corp Direct positive emulsions
US3035917A (en) * 1958-11-12 1962-05-22 Ilford Ltd Direct positive emulsions

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3856524A (en) * 1971-10-14 1974-12-24 Eastman Kodak Co Photographic elements and processes for providing tanned image records
US3867149A (en) * 1972-05-04 1975-02-18 Konishiroku Photo Ind Fogged, direct-positive silver halide photographic material containing a rhodium salt desensitizer and a bispyrazolone dye stabilizer
US3847619A (en) * 1972-11-20 1974-11-12 Eastman Kodak Co Ion-paired cobaltic complexes and photographic elements containing same
US4395483A (en) * 1979-04-27 1983-07-26 Fuji Photo Film Co., Ltd. Direct positive type silver halide photosensitive material
US5240828A (en) * 1989-12-22 1993-08-31 Eastman Kodak Company Direct reversal emulsions

Also Published As

Publication number Publication date
FR2029089A1 (fr) 1970-10-16
GB1234741A (en) 1971-06-09
DE2003037A1 (de) 1970-08-06
BE743560A (fr) 1970-05-28
DE2003037B2 (de) 1977-04-21

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