US2541472A - Direct positive emulsion containing desensitizing dye - Google Patents

Direct positive emulsion containing desensitizing dye Download PDF

Info

Publication number
US2541472A
US2541472A US35987A US3598748A US2541472A US 2541472 A US2541472 A US 2541472A US 35987 A US35987 A US 35987A US 3598748 A US3598748 A US 3598748A US 2541472 A US2541472 A US 2541472A
Authority
US
United States
Prior art keywords
emulsion
direct positive
emulsion containing
silver chloride
quinoline
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
US35987A
Other languages
English (en)
Inventor
William B Kendall
George D Hill
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak 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
Priority to BE489729D priority Critical patent/BE489729A/xx
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US35987A priority patent/US2541472A/en
Priority to FR989400D priority patent/FR989400A/fr
Priority to GB17049/49A priority patent/GB667206A/en
Application granted granted Critical
Publication of US2541472A publication Critical patent/US2541472A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • G03C1/485—Direct positive emulsions
    • G03C1/48592—Positive image obtained by various effects other than photohole bleaching or internal image desensitisation, e.g. Sabatier, Clayden effect
    • 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
    • G03C1/36—Desensitisers

Definitions

  • This invention relates to photographic emulsions, and particularly to a direct positive photographic emulsion containing desensitizing dyes or compounds.
  • a further object is to provide a direct positive emulsion in which high contrast images can be obtained.
  • a still further object is to provide a method of producing direct positive images of low minimum density.
  • the photographic emulsion used in our process is a silver chloride emulsion containing substantially no silver bromide or silver iodide.
  • the desensitizing compound in amounts ranging from 0.1 gram to 2 grams ofcompound per 100 grams of silver chloride.
  • the emulsion is then coated on a support and flashed with white light to fog it. It is then exposed to an image through a yellow filter-and developed in the usual way to produce a positive image.
  • the reversal speed of the emulsion is approximately /400 that of ordinary contact printing paper.
  • the desensitizing compounds used according to our invention are benzothiazole, quinoline, indolenine, benzotriazole, and rhodanine compounds having one or more nitro groups attached to a benzene nucleus which is either a part of the 1 heterocyclic compound or is attached to it through a doubly-bonded carbon to carbon chain.
  • the emulsion is coated on the sup- 1 port, which may be of paper, glass, synthetic resin, or other suitable material.
  • the emulsion is then flashed to a high density with white light.
  • the fiash exposure should be of sufficient intensity to produce a high density upon development, although not necessarily the maximum density which the emulsion is capable of producing.
  • a very heavy flash exposure requires a longer exposure to yellow light to remove its effect.
  • the emulsion may also be fogged chemically rather than by light, and in this case the fogging may be done before or after addition of the reversing compound using non-sulfide fogging reagents.
  • Addition of formaldehyde to the emulsion is a suitable way of fogging the emulsion chemically. In this case no flash exposure is needed, and the only exposure-necessary to give a positive image directly is the image-forming exposure. through the-yellow filter.
  • the reversal exposure is made with minus blue light, that is, light 'of 500 to 700 m wavelength.
  • a No. 12 or No. 15 filter (Wratten Light Filters, Eastman Kodak Co., 1945) may be used over the light source to produce reversing'light, or even a No. 2A filter if the blue speed of the emulsion is sufficiently, low. Maximum reversal is obtained at 520 to 540 m wavelength.
  • Eacample 1 This example illustrates fogging by light after addition. of; the reversing compound.
  • the prefiashed material can be exposed to an image with light modulated by a Wratten No. 15 filter.
  • Example 2 This example illustrates chemical fogging before addition of the reversing compound.
  • the emulsions made according to our invention produce a low minimum density and a high maximum density on reversal. They :are -es-- pecially useful for reproduction of document letters and drawings.
  • a direct positive photographic emulsion comprising a strongly fogged silver chloride emulsion containing a compound selected from the class consisting of benzothiazole, quinoline, indolenine;
  • a direct positive photographic emulsion comprising a strongly fogged silver chloride emulsion containing Z-(p-nitrostyryl) quinoline metho-ptoluene sulfon'ate.
  • a direct positive photographic emulsion comprising a strongly fogged silver chloride emulsioncontaining a 6-nitro-1 2,3-benzotriazole.
  • the method of making a direct positive photographic emulsion which comprises precipitate ing silver chloride in gelatin, adding to the emul-' sion a compound selected from the class consist-" ing of benzothiazole, quinoline, indolenine, ben-j zotriazole and rhodanine compounds and their alkyl quaternary salts having at least one nitro group attachedto a benzene nucleus and strongly fogging the emulsion in the presence of said compound.
  • a direct positive photographic emulsion which comprises precipitating silver chloride in gelatin, chemically strongly fogging the emulsion and then adding to it a compound selected from the class consisting of benzothiazole, quinoline, indolenine, benzotriazole and rhodanine compounds and their alkyl quaternary salts having at least one nitro group attached to a benzene nucleus.
  • photographic emulsion which comprises precipiphotographic emulsion which comprises precipitating silver chloride in gelatin, adjusting the emulsion to an alkaline condition, strongly fogging said emulsion chemically with formaldehyde, adjusting the emulsion to an acid condition and mixing with it a 2-nitrostyryl benzothiazole quaternary salt.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US35987A 1948-06-29 1948-06-29 Direct positive emulsion containing desensitizing dye Expired - Lifetime US2541472A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE489729D BE489729A (en(2012)) 1948-06-29
US35987A US2541472A (en) 1948-06-29 1948-06-29 Direct positive emulsion containing desensitizing dye
FR989400D FR989400A (fr) 1948-06-29 1949-06-21 Nouvelles émulsions photographiques et procédé pour leur préparation
GB17049/49A GB667206A (en) 1948-06-29 1949-06-28 Improvements in photographic processes and materials therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US35987A US2541472A (en) 1948-06-29 1948-06-29 Direct positive emulsion containing desensitizing dye

Publications (1)

Publication Number Publication Date
US2541472A true US2541472A (en) 1951-02-13

Family

ID=21885938

Family Applications (1)

Application Number Title Priority Date Filing Date
US35987A Expired - Lifetime US2541472A (en) 1948-06-29 1948-06-29 Direct positive emulsion containing desensitizing dye

Country Status (4)

Country Link
US (1) US2541472A (en(2012))
BE (1) BE489729A (en(2012))
FR (1) FR989400A (en(2012))
GB (1) GB667206A (en(2012))

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614927A (en) * 1949-06-01 1952-10-21 Eastman Kodak Co Rapid processing of photographic materials
US2774668A (en) * 1953-05-28 1956-12-18 Polaroid Corp Process and product for forming color images from complete dyes
US2947629A (en) * 1958-09-17 1960-08-02 Eastman Kodak Co Nitrosopyrimidine desensitizing compounds and photographic emulsions containing them
US2954292A (en) * 1957-10-04 1960-09-27 Ilford Ltd Photographic desensitising compounds
US2965485A (en) * 1957-08-19 1960-12-20 Ilford Ltd Photographic desensitising compounds
US3023102A (en) * 1957-09-24 1962-02-27 Gen Aniline & Film Corp Direct positive photographic emulsion
US3062651A (en) * 1959-01-21 1962-11-06 Eastman Kodak Co Unhardened, fogged emulsions and method of processing to positive images
US3189456A (en) * 1961-06-19 1965-06-15 Du Pont Radiation-sensitive emulsions and elements and their preparation
DE977335C (de) * 1953-03-16 1965-12-16 Agfa Ag Verfahren zur Verminderung der Blauempfindlichkeit von photographischen Halogensilberemulsionen
US3237008A (en) * 1961-01-19 1966-02-22 Eastman Kodak Co Roomlight handling radiographic element including an x-ray sensitive layer overcoated with a dye desensitized silver halide emulsion
US3250618A (en) * 1959-05-13 1966-05-10 Eastman Kodak Co Thermal resensitization of desensitized silver halide photographic emulsions
US3278307A (en) * 1961-11-21 1966-10-11 Eastman Kodak Co Photographic process for producing prints stabilized against print-out
US3284203A (en) * 1961-05-02 1966-11-08 Fuji Photo Film Co Ltd Direct positive photographic materials
US3295969A (en) * 1961-04-12 1967-01-03 Eastman Kodak Co Photographic spirit duplicating process
US3364026A (en) * 1963-02-14 1968-01-16 Eastman Kodak Co Fogged silver halide direct positive solarizing elements containing merocyanine dyes
US3367779A (en) * 1965-01-21 1968-02-06 Fuji Photo Film Co Ltd Direct positive silver halide photographic materials
US3372031A (en) * 1963-08-28 1968-03-05 Ilford Ltd Direct positive silver halide element with contiguous colloid layer containing developing agent
US3713832A (en) * 1968-07-15 1973-01-30 Fuji Photo Film Co Ltd Solarization type silver halide emulsion containing a halogenated hydroxyphthalein sensitizing dye and a desensitizing compound
US3988154A (en) * 1974-02-19 1976-10-26 Eastman Kodak Company Photographic supports and elements utilizing photobleachable omicron-nitroarylidene dyes
US3988156A (en) * 1974-02-19 1976-10-26 Eastman Kodak Company Photographic supports and elements utilizing photobleachable o-nitroarylidene dyes
US4271263A (en) * 1980-05-15 1981-06-02 Minnesota Mining And Manufacturing Company Thermally developable photosensitive compositions containing acutance agents
US4308379A (en) * 1980-05-15 1981-12-29 Minnesota Mining And Manufacturing Company Acutance agents for use in thermally developable photosensitive compositions
US4404277A (en) * 1981-08-21 1983-09-13 Minnesota Mining And Manufacturing Company Desensitizing dyes for photographic emulsions
EP0754967A1 (en) 1995-07-14 1997-01-22 Agfa-Gevaert N.V. Photographic direct positive material containing a particular stabilizer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865749A (en) * 1956-11-06 1958-12-23 Eastman Kodak Co Stabilized photographic emulsions

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066099A (en) * 1928-01-31 1936-12-29 Agfa Ansco Corp Photographic emulsion
US2271229A (en) * 1939-11-10 1942-01-27 Eastman Kodak Co Fog inhibitor for photographic developers
US2324123A (en) * 1941-07-08 1943-07-13 Eastman Kodak Co Fog inhibitor for photographic developers
US2384593A (en) * 1943-08-06 1945-09-11 Eastman Kodak Co Antifoggant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2066099A (en) * 1928-01-31 1936-12-29 Agfa Ansco Corp Photographic emulsion
US2271229A (en) * 1939-11-10 1942-01-27 Eastman Kodak Co Fog inhibitor for photographic developers
US2324123A (en) * 1941-07-08 1943-07-13 Eastman Kodak Co Fog inhibitor for photographic developers
US2384593A (en) * 1943-08-06 1945-09-11 Eastman Kodak Co Antifoggant

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614927A (en) * 1949-06-01 1952-10-21 Eastman Kodak Co Rapid processing of photographic materials
DE977335C (de) * 1953-03-16 1965-12-16 Agfa Ag Verfahren zur Verminderung der Blauempfindlichkeit von photographischen Halogensilberemulsionen
US2774668A (en) * 1953-05-28 1956-12-18 Polaroid Corp Process and product for forming color images from complete dyes
US2965485A (en) * 1957-08-19 1960-12-20 Ilford Ltd Photographic desensitising compounds
US3023102A (en) * 1957-09-24 1962-02-27 Gen Aniline & Film Corp Direct positive photographic emulsion
US2954292A (en) * 1957-10-04 1960-09-27 Ilford Ltd Photographic desensitising compounds
US2947629A (en) * 1958-09-17 1960-08-02 Eastman Kodak Co Nitrosopyrimidine desensitizing compounds and photographic emulsions containing them
US3062651A (en) * 1959-01-21 1962-11-06 Eastman Kodak Co Unhardened, fogged emulsions and method of processing to positive images
US3250618A (en) * 1959-05-13 1966-05-10 Eastman Kodak Co Thermal resensitization of desensitized silver halide photographic emulsions
US3237008A (en) * 1961-01-19 1966-02-22 Eastman Kodak Co Roomlight handling radiographic element including an x-ray sensitive layer overcoated with a dye desensitized silver halide emulsion
US3295969A (en) * 1961-04-12 1967-01-03 Eastman Kodak Co Photographic spirit duplicating process
US3284203A (en) * 1961-05-02 1966-11-08 Fuji Photo Film Co Ltd Direct positive photographic materials
US3189456A (en) * 1961-06-19 1965-06-15 Du Pont Radiation-sensitive emulsions and elements and their preparation
US3278307A (en) * 1961-11-21 1966-10-11 Eastman Kodak Co Photographic process for producing prints stabilized against print-out
US3364026A (en) * 1963-02-14 1968-01-16 Eastman Kodak Co Fogged silver halide direct positive solarizing elements containing merocyanine dyes
US3372031A (en) * 1963-08-28 1968-03-05 Ilford Ltd Direct positive silver halide element with contiguous colloid layer containing developing agent
US3367779A (en) * 1965-01-21 1968-02-06 Fuji Photo Film Co Ltd Direct positive silver halide photographic materials
US3713832A (en) * 1968-07-15 1973-01-30 Fuji Photo Film Co Ltd Solarization type silver halide emulsion containing a halogenated hydroxyphthalein sensitizing dye and a desensitizing compound
US3988154A (en) * 1974-02-19 1976-10-26 Eastman Kodak Company Photographic supports and elements utilizing photobleachable omicron-nitroarylidene dyes
US3988156A (en) * 1974-02-19 1976-10-26 Eastman Kodak Company Photographic supports and elements utilizing photobleachable o-nitroarylidene dyes
US4271263A (en) * 1980-05-15 1981-06-02 Minnesota Mining And Manufacturing Company Thermally developable photosensitive compositions containing acutance agents
US4308379A (en) * 1980-05-15 1981-12-29 Minnesota Mining And Manufacturing Company Acutance agents for use in thermally developable photosensitive compositions
US4404277A (en) * 1981-08-21 1983-09-13 Minnesota Mining And Manufacturing Company Desensitizing dyes for photographic emulsions
EP0754967A1 (en) 1995-07-14 1997-01-22 Agfa-Gevaert N.V. Photographic direct positive material containing a particular stabilizer

Also Published As

Publication number Publication date
BE489729A (en(2012))
FR989400A (fr) 1951-09-07
GB667206A (en) 1952-02-27

Similar Documents

Publication Publication Date Title
US2541472A (en) Direct positive emulsion containing desensitizing dye
US3033682A (en) Radiation-sensitive emulsions, elements, and processes for making same
DE3313394A1 (de) Verfahren zur behandlung eines photographischen materials und photographisches material
US3733198A (en) Direct positive processes utilizing silver halide internal latent image emulsions containing high concentration of heterocyclic thione antifoggants
DE1547741A1 (de) Photographisches Aufzeichnungsverfahren und Material zur Durchfuehrung desselben
US3594172A (en) Light developable,direct-writing,silver halide emulsions containing gold and iodine
US3607266A (en) Image intensification process for sensitized film
US3689270A (en) Light-sensitive compositions comprising a silver salt of a tetraazaindene
US3782957A (en) Fogged,direct-positive silver halide emulsion layer containing a cyanine dye and a compound containing a metal of group viii of the periodic table
US3178293A (en) Radiation-sensitive elements and their preparation
JPS6375739A (ja) 直接ポジ型ハロゲン化銀写真感光材料
US3023102A (en) Direct positive photographic emulsion
US3637388A (en) Process for the photographic production of equidensities
DE1945409A1 (de) Verfahren zur Herstellung photographischer Bilder
US1582050A (en) Photographic print-out paper and prints made therefrom
US3615602A (en) Color-photographic silver halide emulsion containing colored cyan-forming couplers
US4326021A (en) Photographic negative material with at least one layer containing a desensitized silver halide emulsion
US2947629A (en) Nitrosopyrimidine desensitizing compounds and photographic emulsions containing them
CA1246377A (en) White light handleable photographic materials
US3637387A (en) Direct positive emulsion containing a halide releasing compound developed in the presence of an unsubstituted hydrazine
US3615580A (en) Photographic compositions and processes for making same
US3490909A (en) Spontaneously developable photosoluble silver halide dispersions and elements
JPS5945975B2 (ja) ガゾウケイセイホウ
US3284203A (en) Direct positive photographic materials
US3676131A (en) Chemical development of light-sensitive lead compositions