US2377375A - Thiosalicylic acid antifoggant - Google Patents

Thiosalicylic acid antifoggant Download PDF

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Publication number
US2377375A
US2377375A US514242A US51424243A US2377375A US 2377375 A US2377375 A US 2377375A US 514242 A US514242 A US 514242A US 51424243 A US51424243 A US 51424243A US 2377375 A US2377375 A US 2377375A
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Prior art keywords
thiosalicylic acid
acid
emulsion
antifoggant
layer
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Expired - Lifetime
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US514242A
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Harold D Russell
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Eastman Kodak Co
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Eastman Kodak Co
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Publication date
Priority to FR956709D priority Critical patent/FR956709A/fr
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US514242A priority patent/US2377375A/en
Priority to GB20891/44A priority patent/GB580587A/en
Application granted granted Critical
Publication of US2377375A publication Critical patent/US2377375A/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
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/34—Fog-inhibitors; Stabilisers; Agents inhibiting latent image regression
    • G03C1/346—Organic derivatives of bivalent sulfur, selenium or tellurium
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/162—Protective or antiabrasion layer

Definitions

  • This invention relates to photography and particularly to a method of preventing fog in photographic silver halide emulsions.
  • fog A more or less uniform veil of silver, which is known as fog, is produced in the emulsion when the limits of time and temperature of development are exceeded.
  • an object of the present invention to provide a method for reducing fog in photographic emulsions.
  • a further object is to provide a photographic emulsion containing a novel fog inhibiting agent.
  • a still further object is to provide a photographic developing solution which has decreased tendency to produce fog in a photographic emulsion.
  • Fig. 1 is a sectional view of a photographic film having an emulsion layer containing thiosalicylic acid
  • Fig. 2 is a sectional view of a film having an overcoating layer containing thiosalicylic acid
  • Fig. 3 is a sectional view of a film having a backing layer containing thiosalicylic acid.
  • the thiosalicylic acid When used in the developing solution, the thiosalicylic acid may be employed as the free acid or as the sodium salt or other water-soluble salt.
  • the amounts used may vary from .01 gram to 1 gram per liter of developer.
  • the compounds may also be used in a prebath prior to development.
  • the thiosalicylic acid When used in the emulsion itself, the thiosalicylic acid may also be employed in the salt form and may be incorporated at any stage in the manufacture of the emulsion.
  • the amounts used in the emulsion vary from 0.2 mg. to 20 mgs. per 50 grams of silver halide.
  • Example 1 The following example illustrates a developing solution containing thiosalicylic acid.
  • Example 2 Monomethyl-p-aminophenol sul- Water to .lite 1
  • Example 2 The following example illustrates a developing formula which produces high contrast:
  • Example 3 therefore avoids the tendency to produce variations in the sensitometric characteristics of the emulsion.
  • thiosalicylic acid is applied in a gelatin layer over a silver halide emulsion layer, for example, the rate of growth" of fog with development time may be reduced without substantially changing the sensitometric curve shape or the maximum density of the emulsion.
  • the thiosalicylic acid may be used alone as an antifoggant or it may be combined with another antifoggant which may be present either in the same layer as the thios'alicylic acid or in an adjacent layer.
  • Fig. 1 a sectional view .of a photographic film comprising a support iii of any suitable material such as glass, cellulose ester, synthetic resin or paper, having thereon an emulsion layer H containing thiosalicylic acid.
  • Fig. 2 shows a similar material in which the support l0 has thereon a gelatino-silver halide emulsion layer I2 which is overcoated with a gelatin layer l3 containing thiosalicylic acid.
  • Fig. 1 a sectional view .of a photographic film comprising a support iii of any suitable material such as glass, cellulose ester, synthetic resin or paper, having thereon an emulsion layer H containing thiosalicylic acid.
  • Fig. 2 shows a similar material in which the support l0 has thereon a gelatino-silver halide emulsion layer I2 which is overcoated with a gelatin layer l3 containing thio
  • FIG 3 illustrates a further modification in which the support i0 is coated with an emulsion layer I2 and the opposite side of the support i0 has thereon a gelatin backing layer It containing thiosalicylic acid.
  • the thinsalicylic acid present in a backing layer is dissolvel in the developer upon development and exerts its antifoggant action during development.
  • the method of reducing fog in a photographic silver halldeemulsion which comprises exposing said emulsion and developing it in the prising a silver halide developing agent and a tog-inhibiting amount of thiosalicylic acid.
  • a photographic element comprising a support having thereon a silver halide emulsion layer and another layer containing a tog-inhibiting amount of thiosalicylic acid.
  • a photographic element comprising a support having thereon a silver halide emulsion layer and a gelatin overcoating layer containing a 10 fog-inhibiting amount of thiosallcylic acid.

Description

June 5, 1945. H. D. RUSSELL 2,377,375
I THIOSALICYLIC ACID ANTIFOGGANT Filed Dec. 14, 1943 EMULSION CONTAINING THIOSALICYL/C ACID I0 V// /j/ SUPPORT 13 OVERCOAT CONTAIN/N6 TH/OSAL/CYLIC. ACID BACK/N6 CONTAINING TH/OSflL/CYL/C ACID HAROLD D. RUSSELL IN V EN TOR W W MQAQA A TTORNE YS Patented June 8, 1945 Harold D. Russell, Rochester, N. 1., Eastman Kodak Company, Roch to a lign 01 ester, N. Y.,
corporation of New Jersey Application December 14, 1943, Serial No. 514,242
70laims.
This invention relates to photography and particularly to a method of preventing fog in photographic silver halide emulsions.
One of the problems met in the development of photographic emulsions for protracted periods of time or at higher temperatures than normal is that of fog. A more or less uniform veil of silver, which is known as fog, is produced in the emulsion when the limits of time and temperature of development are exceeded.
It is, therefore, an object of the present invention to provide a method for reducing fog in photographic emulsions. A further object is to provide a photographic emulsion containing a novel fog inhibiting agent. A still further object is to provide a photographic developing solution which has decreased tendency to produce fog in a photographic emulsion. Other objects will appear from the following description of my invention.
These objects are accomplished, according to my invention, by incorporating thiosalicyclic acid in a photographic emulsion, developer, backing or overcoating layer.
In the accompanying drawing. Fig. 1 is a sectional view of a photographic film having an emulsion layer containing thiosalicylic acid, Fig. 2 is a sectional view of a film having an overcoating layer containing thiosalicylic acid and Fig. 3 is a sectional view of a film having a backing layer containing thiosalicylic acid.
When used in the developing solution, the thiosalicylic acid may be employed as the free acid or as the sodium salt or other water-soluble salt. The amounts used may vary from .01 gram to 1 gram per liter of developer. The compounds may also be used in a prebath prior to development.
When used in the emulsion itself, the thiosalicylic acid may also be employed in the salt form and may be incorporated at any stage in the manufacture of the emulsion. The amounts used in the emulsion vary from 0.2 mg. to 20 mgs. per 50 grams of silver halide.
My invention will be further illustrated by reference to the following examples:
7 Example 1 The following example illustrates a developing solution containing thiosalicylic acid.
Monomethyl-p-aminophenol sul- Water to .lite 1 Example 2 The following example illustrates a developing formula which produces high contrast:
lh'droquinone ..grams-- 15 Sodium sulfite (desiccated) do Sodium carbonate (desiccated) ..-do 50 Potassium bromide do 10 Thiosalicylic a i do 0.1 Waterto liter 1 Example 3 therefore avoids the tendency to produce variations in the sensitometric characteristics of the emulsion. When thiosalicylic acid is applied in a gelatin layer over a silver halide emulsion layer, for example, the rate of growth" of fog with development time may be reduced without substantially changing the sensitometric curve shape or the maximum density of the emulsion.
The thiosalicylic acid may be used alone as an antifoggant or it may be combined with another antifoggant which may be present either in the same layer as the thios'alicylic acid or in an adjacent layer.
In the accompanying drawing I have shown in Fig. 1 a sectional view .of a photographic film comprising a support iii of any suitable material such as glass, cellulose ester, synthetic resin or paper, having thereon an emulsion layer H containing thiosalicylic acid. Fig. 2 shows a similar material in which the support l0 has thereon a gelatino-silver halide emulsion layer I2 which is overcoated with a gelatin layer l3 containing thiosalicylic acid. Fig. 3 illustrates a further modification in which the support i0 is coated with an emulsion layer I2 and the opposite side of the support i0 has thereon a gelatin backing layer It containing thiosalicylic acid. The thinsalicylic acid present in a backing layer is dissolvel in the developer upon development and exerts its antifoggant action during development.
It will be understood that the examples and modifications included herein are illustrative only and that my invention is to be taken as limited only by the scope of the appended claims.
I claim:
1. The method of reducing fog in a photographic silver halldeemulsion, which comprises exposing said emulsion and developing it in the prising a silver halide developing agent and a tog-inhibiting amount of thiosalicylic acid.
6. A photographic element comprising a support having thereon a silver halide emulsion layer and another layer containing a tog-inhibiting amount of thiosalicylic acid.
7. A photographic element comprising a support having thereon a silver halide emulsion layer and a gelatin overcoating layer containing a 10 fog-inhibiting amount of thiosallcylic acid.
HAROLD D. RUSSELL.
US514242A 1943-12-14 1943-12-14 Thiosalicylic acid antifoggant Expired - Lifetime US2377375A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR956709D FR956709A (en) 1943-12-14
US514242A US2377375A (en) 1943-12-14 1943-12-14 Thiosalicylic acid antifoggant
GB20891/44A GB580587A (en) 1943-12-14 1944-10-26 Sensitive photographic materials and the development of images therein

Applications Claiming Priority (1)

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US514242A US2377375A (en) 1943-12-14 1943-12-14 Thiosalicylic acid antifoggant

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FR (1) FR956709A (en)
GB (1) GB580587A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432865A (en) * 1944-02-03 1947-12-16 Ilford Ltd Photographic elements having light-sensitive silver halide layers containing iron, cobalt and nickel derivatives of mercapto tetrazoles, triazoles or diazoles
US2453347A (en) * 1946-11-30 1948-11-09 Eastman Kodak Co Stabilization of photographic prints with thiophenols
US2533990A (en) * 1947-06-10 1950-12-12 Du Pont Silver halide developer compositions containing polyoxyalkylene ethers of hexitol ring dehydration products
US2573027A (en) * 1944-11-13 1951-10-30 Ilford Ltd Photographic element and process utilizing antibronzing agents
US3226231A (en) * 1963-05-16 1965-12-28 Gen Aniline & Film Corp Fog reduction in silver halide emulsions with 3-mercaptobenzoic acid
US4142897A (en) * 1975-08-09 1979-03-06 Konishiroku Photo Industry Co., Ltd. Gelatino silver halide photographic material hardened with a reaction product of a vinylsulfonyl compound and a water soluble compound
US4336321A (en) * 1980-02-07 1982-06-22 Mitsubishi Paper Mills, Ltd. Silver halide photographic materials
US4892812A (en) * 1983-02-04 1990-01-09 Mitsubishi Paper Mills, Ltd. Silver halide photosensitive materials

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432865A (en) * 1944-02-03 1947-12-16 Ilford Ltd Photographic elements having light-sensitive silver halide layers containing iron, cobalt and nickel derivatives of mercapto tetrazoles, triazoles or diazoles
US2432864A (en) * 1944-02-03 1947-12-16 Ilford Ltd Photographic elements bearing silver halide emulsion layer and adjacent light-insensitive colloid layer containing silver derivatives of azoles
US2573027A (en) * 1944-11-13 1951-10-30 Ilford Ltd Photographic element and process utilizing antibronzing agents
US2453347A (en) * 1946-11-30 1948-11-09 Eastman Kodak Co Stabilization of photographic prints with thiophenols
US2533990A (en) * 1947-06-10 1950-12-12 Du Pont Silver halide developer compositions containing polyoxyalkylene ethers of hexitol ring dehydration products
US3226231A (en) * 1963-05-16 1965-12-28 Gen Aniline & Film Corp Fog reduction in silver halide emulsions with 3-mercaptobenzoic acid
US4142897A (en) * 1975-08-09 1979-03-06 Konishiroku Photo Industry Co., Ltd. Gelatino silver halide photographic material hardened with a reaction product of a vinylsulfonyl compound and a water soluble compound
US4336321A (en) * 1980-02-07 1982-06-22 Mitsubishi Paper Mills, Ltd. Silver halide photographic materials
US4892812A (en) * 1983-02-04 1990-01-09 Mitsubishi Paper Mills, Ltd. Silver halide photosensitive materials

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FR956709A (en) 1950-02-06
GB580587A (en) 1946-09-12

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