US3185569A - Photographic silver halide material containing lactose - Google Patents

Photographic silver halide material containing lactose Download PDF

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Publication number
US3185569A
US3185569A US266040A US26604063A US3185569A US 3185569 A US3185569 A US 3185569A US 266040 A US266040 A US 266040A US 26604063 A US26604063 A US 26604063A US 3185569 A US3185569 A US 3185569A
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US
United States
Prior art keywords
silver halide
lactose
silver
emulsions
gelatin
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
US266040A
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English (en)
Inventor
Weber Hans
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Application granted granted Critical
Publication of US3185569A publication Critical patent/US3185569A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/34Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/06Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08Sensitivity-increasing substances
    • G03C1/10Organic substances

Definitions

  • the covering power of photosensitive photographic silverhalide preparations can be increased by adding lactose to the photosensitive layer and/or to the auxiliary layers, e.g., sublayers, filter layers and anti-abrasion layers, with no occurrence of the drawbacks mentioned above. Addition of lactose then not only enhances covering power, but also substantially diminishes fogging. These results are wholly unexpected and were in no way predictable. As is known in the art, lactose is not even a macromolecular compound, but has a comparatively low molecular weight and is also characterized by substantial solubility in water. Hence, from this it would be expected that the lactose would be leached out of the film layers during processing so that its effect would be lost.
  • lactose is not even a macromolecular compound, but has a comparatively low molecular weight and is also characterized by substantial solubility in water. Hence, from this it would be expected that the lactose would be leached out of the film layers during processing so
  • the present invention offers the possibility of employing a low-molecular substance for the specified purpose, with the advantage that it does not affect the viscosity of the emulsion.
  • reducing agents to photosensitive emulsions 3,185,569 Patented May 25, 1965
  • Preparation of the emulsions according. to this invention may be carried out by the usual methods.
  • the lactose is added to the emulsion in amounts of 5 55 g. per liter, the addition being advantageously effected either before finishing the emulsion or immediately before coating the film. Addition may, however, be effected at any other time as maybe desired during the emulsification process.
  • lactose to the photosensitive layer and/ or to the auxiliary layers in amounts of 5-55 g. to 20-100 g. of silver bromide.
  • the gelatino-silver halide emulsions of the invention contain at least 20% by weight of lactose based on silver halide. On a dry basis, the lactose-containing gelatinosilver halide emulsions contain 35% to 70% silver halide, 20% to 60% gelatin, and 5% to 40% lactose, all by weight.
  • the process is applicable to all silver halide: gelatin emulsions but is particularly effective in coarse-grained high-sensitivity emulsions.
  • the lactose can be added to gelatin silver chloride, silver bromide, silver iodobromide, silver chlorobromide and other simple and mixed silver halide emulsions.
  • the final emulsions can contain any of the wellknown optical sensitizing dyes as well as non-optical sensitizers such as sulphur sensitizers, e.g., allyl isothiocyanate, allyl diethyl thiourea, phenyl isothiocyanate and sodium thiosulfate; the polyoxyalkylene ethers disclosed in Blake et al., U.S.
  • Other non-optical sensitizers such as amines as taught by Staud et al., U.S. Patent 1,925,508 and metal salts as taught by Baldsiefen, U.S. Patent 2,540,085 and Baldsiefen et al., U.S. Patent 2,540,086 may also be used.
  • Antifoggants e.g., benzotriazole and triazaindenes can be used as well as the usual hardeners, i.e., chrome alum, formaldehyde, etc.
  • the modified lactose-containing gelatino-silver halide emulsions may be coated on any suitable support such as paper or films composed of cellulosic esters, e.g., cellulose triacetate, cellulose acetate/butyrate; superpolymers, e.g., polyvinyl chloride co vinyl acetate, polyvinyl acetals, e.g., formal and acetal; polystyrene, polyamides, e.g., polyhexamethylene adipamide, and polyesters, e.g., polyethylene terephthalate, polyethylene terephthalate/ isophthalate and those polyesters obtainable by condensing terephthalic acid or dimethyl terephthalate with propylene glycol, diethylene glycol, tetramethylene glycol or cyclohexane-1,4-dimethanol (hexahydro-p-xylene alcohol).
  • lactose may be used in emulsions according to this invention. Because of its low price, it has substantial commercial superiority over the dextrans.
  • Lactose 40 g. per kg. of emulsion ready for coating, is added to emulsion B while no lactose is added to emulsion A.
  • the emulsions are cast on a film base, yielding films A and B.
  • a Wedge pattern was copied on each of these films. They were developed in a developer having the composition:
  • a photographic gelatin-silver halide emulsion layer containing on a dry basis to 70% silver halide, 20% to 60% gelatin and 5% to lactose, all by weight.
  • a photographic element comprising a gelatino-silver halide emulsion layer having in intimate association therewith 5 to 22 grams of lactose per 20 to 100 grams of silver halide.
  • a photographic element comprising a gelatino-sil- -ver halide emulsion layer having in intimate association therewith on a dry basis 35% to 70% silver halide, 20% to gelatin, and 5% to 40% lactose, by weight.

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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)
US266040A 1962-08-29 1963-03-18 Photographic silver halide material containing lactose Expired - Lifetime US3185569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA41045A DE1153990B (de) 1962-08-29 1962-08-29 Lichtempfindliches fotografisches Halogensilbermaterial

Publications (1)

Publication Number Publication Date
US3185569A true US3185569A (en) 1965-05-25

Family

ID=6932294

Family Applications (1)

Application Number Title Priority Date Filing Date
US266040A Expired - Lifetime US3185569A (en) 1962-08-29 1963-03-18 Photographic silver halide material containing lactose

Country Status (4)

Country Link
US (1) US3185569A (en:Method)
BE (1) BE636720A (en:Method)
DE (1) DE1153990B (en:Method)
GB (1) GB978880A (en:Method)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607346A (en) * 1969-04-21 1971-09-21 Eastman Kodak Co Layers method of wet transferring unexposed photographic emulsion
US3936300A (en) * 1972-11-02 1976-02-03 Polaroid Corporation Glucoside humectant as silver halide emulsion stabilizer
US5232827A (en) * 1991-09-09 1993-08-03 Eastman Kodak Company Stabilized photographic recording materials
US5370986A (en) * 1990-03-05 1994-12-06 Eastman Kodak Company Stabilization of photographic recording materials

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607346A (en) * 1969-04-21 1971-09-21 Eastman Kodak Co Layers method of wet transferring unexposed photographic emulsion
US3936300A (en) * 1972-11-02 1976-02-03 Polaroid Corporation Glucoside humectant as silver halide emulsion stabilizer
US5370986A (en) * 1990-03-05 1994-12-06 Eastman Kodak Company Stabilization of photographic recording materials
US5232827A (en) * 1991-09-09 1993-08-03 Eastman Kodak Company Stabilized photographic recording materials

Also Published As

Publication number Publication date
DE1153990B (de) 1963-09-05
GB978880A (en) 1964-12-23
BE636720A (en:Method)

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