US2489341A - Production of photographic silver halide emulsions - Google Patents

Production of photographic silver halide emulsions Download PDF

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Publication number
US2489341A
US2489341A US600844A US60084445A US2489341A US 2489341 A US2489341 A US 2489341A US 600844 A US600844 A US 600844A US 60084445 A US60084445 A US 60084445A US 2489341 A US2489341 A US 2489341A
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gelatin
silver halide
emulsion
phase
solution
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US600844A
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English (en)
Inventor
Waller Cecil
Woosley Duncan Pax
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Ilford Imaging UK Ltd
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Ilford Ltd
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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
    • G03C1/015—Apparatus or processes for the preparation of emulsions

Definitions

  • This invention relates to the production of silver-halide photographic emulsions.
  • the suspension of silver halide in gelatin may be centrifuged.
  • This method presents the difficulty, however, that if the centrifuging is relatively mild, the finer particles of silver halide are not removed from the suspension and considerable loss occurs, whereas on the other hand, if the centrifuging is relatively severe, the particles pack together to form aggregates which do not readily break down. when subsequently emulsified in gelatin. Moreover the method is laborious and expensive.
  • the second method is almost universally adopted in practice.
  • the gelatin suspension is allowed to set, for example by chilling (possibly after the addition of further gelatin), is shredded and the shredded suspension is then Washed with water.
  • anion soap forms, with the protein, in the presence of a weal: acid or dilute electrolyte, a loosely bound complex which separates out from the main solution.
  • the step of freeing the emulsion from unwanted water-soluble constituents is effected by adding to the suspension of silver halide in gelatin or other protein colloid at a low pH value or in the presence of an electrolyte (which may be the salt or salts which it is desired to remove) sufficient of an anion soap to cause precipitation of the protein phase containing the silver halide (and also the anion soap) and subjecting this phase to a washing operation.
  • an electrolyte which may be the salt or salts which it is desired to remove
  • anion soaps are surface-active compounds in which the reduction in surface tension resultant on their addition to water is due to the anion.
  • the classification of soaps is discussed in the book Kolloidchemische Uneuben der Textilveredlung by Dr. E. Valko, 1937, at pages 519-522, to which reference is made for the meaning of the expression anion soaps.
  • Specific classes of compounds falling within this generic ex ression are as follows:
  • Soluble salts of long-chain-alkyl carboxylic acids e. g. soluble salts of fatty acids containing eight or more carbon atoms as, for example, oleic, ricinoleic, linoleic, stearic and palmitic acids.
  • Soluble salts of sulphated higher fatty alcohols e. g. soluble salts of fatty alcohol sulphates of which the alkyl group contains at least eight carbon atoms, as for example, the soluble salts of lauryl hydrogen sulphate and oleyl hydrogen sulphate, I
  • the soluble salts may be formed from alkali metals, e. g. sodium and potassium, from ammonia or from amines, e. g. triethanolamine and cyclohexylamine.
  • the compounds may contain amino residues in the anion of the-soap as, for example, in the sodium salt of ,oleoyl amino ethane sulphonic acid which contains a carbonamide group
  • Very many anion soaps are commercially marketed as detergents .and these commercial products may conveniently be employed in the process of this invention.
  • the pH value of the treated solution should be low or there is a salt which is an electrolyte present when the pH value need not necessarily be low.
  • a salt which is an electrolyte present when the pH value need not necessarily be low.
  • the pH should not be greater'than the isoelectric point of the protein employed.
  • Suitable electrolytes are the soluble salts of mono, diand tri-valent acids such as ammonium nitrate, sodium chloride, magnesium sulphate and potassium citrate.
  • the quantity of the anion soap -required to effect satisfactory sedimentation of suspended matter froma protein solution depends on the protein concentration and on such other factors as the p'I-I value of the solution, the concentration of the electrolyte present and the nature of the anion soap itself. It is not possible, therefore, to define exactly the best conditions for all sets of circumstances, but the optimum conditions for any particular case can readily beascertained by trial.
  • the separated protein phase containing the originally suspended silver halide may be washed with water and re-dispersed in a suitable liquid, or it may be directly re-dispersed in a suitable liquid, for example predominantly aqueous ethyl alcohol, or an aqueous ethyl alcoholic solution of gelatin, reprecipitated by the addition of an excess of an organic non-solvent, e. g. further ethyl alcohol and then Washed.
  • an organic non-solvent e. g. further ethyl alcohol and then Washed.
  • the invention thus affords a means for forming a silver halide suspension in the protein vehicle freed from unwanted salts or other substances which may have been present in the original suspension.
  • the usual procedure in making photographic emulsions is to form the emulsion, ripen wash it and then digest and add any special additions required, e. g. sensitising dyes. It is preferred that this order of operations be carried-out in the present case, the washing operation being .carried out by the method of this invention.
  • Example 1 Various anion soaps were added 1-0.0 cos. of a solution containing 1.43% or silver iodo-bromide in suspension and 9.5% gelatin, and containing ammonium nitrate in a comentration of 0.5 normal, the pH value of the solution :being about 6.0.
  • the soap additions were made at 125 F. and substantially complete sedimentat on'of the suspended silverido-bromide effected in five minutes by the addition of each of the following solutions:
  • the sedimented complexes containing the originally suspended silver iodo-brom'ide may be re-dispersed in warm water .or, more easily, in warm aqueous alcohol .(e. g. 10% alcohol) or in a warm gelatin solution.
  • Example II Various anion soaps were .added to cos. of a solution containing 1.453% silver iodobromide in suspensionand 0.5-% gelatin, the solution being made acid with 'N/lflo'sulphuric acid so that its pH value was 2. *The substantially complete sedimentation of the suspended silver iodo-bromide was effected in five minutesby the addition of each of the following solutions:
  • the sedimented complexes containing the originally suspended silver iodo-bromide may be re-dispersed by warming them with weak alkali solution (e. g. 1% borax solution) or by warming them with a gelatin solution.
  • weak alkali solution e. g. 1% borax solution
  • the supermatant aqueous spirit containing the wetting agent is easily decanted from the precipitate, which is then soaked in water, and re-dispersed in gelatin in known manner to form a photographic emulsion substantially free from the salts present in the original emulsion.
  • the quantities of anion soap given in the above examples are not the minimum concentrations which will cause sedi- .mentation, but are such concentrations as will 'cause rapid sedimentation of the suspended matter to take place.
  • anion soap employed is very active in causing the sedimentation of suspended matter, it is frequently preferable to add the anion soap solution in successive portions allowing the suspension to settle between such additions, as a more complete sedimentation may be effected in this way.
  • the precipitated silver halide-gelatin formed by the process of this invention may be used to form a highly concentrated emulsion suitable for drying to form solid dry particulate emulsions which may be marketed as such for dispersion.
  • solutions of other proteins containing finely divided light-sensitive matter in suspension may also be treated by the process of which comprises forming a suspension of silver halide by precipitating such salt in an aqueous solution of gelatin, and adding to such suspension, in the presence of an acid so that the emulsion has a low pH value, sufiicient of an anion soap to cause precipitation of the gelatin phase containing the silver halide and separating the so-formed gelatin/anion soap complex contain ing silver halide.
  • Process for the production of an organic complex containing silver halide in suspension which comprises forming a suspension of silver halide by precipitating such salt in an aqueous solution of gelatin, and adding to such suspension, at a pH value not substantially greater than the isoelectric point of the gelatin, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide and separating the so-formed gelatin/anion soap complex containing silver halide.
  • Process for the production of an organic complex containing silver halide in suspension which comprises forming a suspension of silver halide by precipitating such salt in an aqueous solution of gelatin, and adding to such suspension, in the presence of an electrolyte, sufficient of a soluble salt of an alkyl sulfonic acid of at least eight carbon atoms to cause precipitation of the gelatin phase containing the silver halide and separating the so-formed gelatin/anion soap complex containing silver halide.
  • Process for the production of an organic complex containing silver halide in suspension which comprises forming a suspension of silver halide in an aqueous solution of gelatin, and adding to such emulsion, in the presence of an electrolyte, sufficient of a soluble salt of a sulphated fatty alcohol of at least eight carbon atoms to cause precipitation of the gelatin phase containing the silver halide and separating the so-formed gelatin/anion soap complex containing silver halide.
  • Process for the production of an organic complex containing silver halide in suspension which comprises forming a suspension of silver halide in an aqueous solution of gelatin, and adding to such emulsion, in the presence of an electrolyte, suflicient of a soluble salt of an alkylated aromatic sulfonic acid to cause precipitation of the gelatin phase containing the silver halide and separating the so-formed gelatin/ anion soap complex containing silver halide.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in an aqueous medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an acid so that the emulsion has a low pH value, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in an aqueous medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, at a pH value "not substantially greater than the isoelectric point of the gelatin, sufficient of an anion soap to cause precipitation of, the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in an aqueous medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufficient of a soluble. salt of an alkyl sulfonic acid of at least eight carbon atoms to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a. washing operation, and thereafter re-dispersing this phase in an aqueous medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufiicient of a soluble salt of a sul- Dhated fatty alcohol of at least eight carbon atoms to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase ,to a washing operation, and thereafter re-dispersing this phase in an aqueous medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufficient of a soluble salt of an alkylated aromatic sulfonic acid to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in an aqueous medium.
  • Process for the production of a silver halide emulsion in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, ripening it, adding to it, in the presence of an electrolyte, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in an aqueous medium, and digesting it.
  • Process for the production of a silver halide emulsion in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, ripening it, adding to it, in the presence of an acid so that the emulsion has a low pH value, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in an aqueous medium, and digestingit.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dislpersing this phase in an aqueous medium, and thereafter drying the emulsion down to form a. dry particulate emulsion.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in a liquid medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an electrolyte, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dis persing this phase in a liquid medium containing ethyl alcohol.
  • Process for the production of silver halide emulsions in gelatin which comprises forming an aqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an acid so that the emulsion has a low pH value, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase-to a washing operation, and thereafter re-dispersing this phase in a liquid medium.
  • Process for the production of silver halide emulsions in gelatin which comprises forming anaqueous emulsion of precipitated silver halide in gelatin, adding to such emulsion, in the presence of an acid so that the emulsion has a low pH value, sufficient of an anion soap to cause precipitation of the gelatin phase containing the silver halide, subjecting this phase to a washing operation, and thereafter re-dispersing this phase in a liquid medium containing ethyl alcohol.

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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)
  • Colloid Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US600844A 1944-07-04 1945-06-21 Production of photographic silver halide emulsions Expired - Lifetime US2489341A (en)

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GB12688/44A GB580504A (en) 1944-07-04 1944-07-04 Improvements in or relating to the production of photographic silver halide emulsions

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527267A (en) * 1944-10-30 1950-10-24 Ilford Ltd Photographic layers containing gelatin-sulfonic acid complexes, and their preparation
US2527268A (en) * 1944-10-30 1950-10-24 Ilford Ltd Production of photographic emulsions
US2527261A (en) * 1944-10-30 1950-10-24 Ilflord Ltd Production of photographic silver halide emulsions from gelatinanion soap complexes
US2527263A (en) * 1945-11-19 1950-10-24 Ilford Ltd Photographic transfer materials bearing gelating anion soap complex silver halide layer
US2614928A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing photographic emulsions
US2614931A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing cellulose ester-silver-halide photographic emulsions
US2614930A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing polyvinyl alcohol-silver halide photographic emulsions
US2618556A (en) * 1947-11-19 1952-11-18 Eastman Kodak Co Process for preparing photographic emulsions
US2728662A (en) * 1947-08-13 1955-12-27 Eastman Kodak Co Method of preparing photographic emulsions
US2953455A (en) * 1957-08-28 1960-09-20 Du Pont Photographic silver halide emulsions containing a ruthenium, palladium or platinum hydroxide in stabilizing amounts and process for preparing the same
US3007796A (en) * 1959-02-25 1961-11-07 Gen Foods Corp Process for preparing photographic emulsions
US3067035A (en) * 1959-04-01 1962-12-04 Du Pont Gelatin-anion soap complex dispersion in polyvinyl alcohol photographic emulsions
US3142568A (en) * 1961-03-13 1964-07-28 Du Pont Photographic emulsions, elements, and processes
US4357419A (en) * 1981-04-02 1982-11-02 Minnesota Mining And Manufacturing Company Covering power in films
EP0115351A2 (fr) 1983-01-28 1984-08-08 Fuji Photo Film Co., Ltd. Matériel photosensible aux halogénures d'argent
EP0691569A1 (fr) 1994-07-04 1996-01-10 Kodak-Pathe Emulsion photographique à sensibilité améliorée
US5492805A (en) * 1994-06-30 1996-02-20 Minnesota Mining And Manufacturing Company Blocked leuco dyes for photothermographic elements
US5492803A (en) * 1995-01-06 1996-02-20 Minnesota Mining And Manufacturing Company Hydrazide redox-dye-releasing compounds for photothermographic elements
US5492804A (en) * 1994-06-30 1996-02-20 Minnesota Mining And Manufacturing Company Chromogenic leuco redox-dye-releasing compounds for photothermographic elements
US5891615A (en) * 1997-04-08 1999-04-06 Imation Corp. Chemical sensitization of photothermographic silver halide emulsions
US5928857A (en) * 1994-11-16 1999-07-27 Minnesota Mining And Manufacturing Company Photothermographic element with improved adherence between layers
US5939249A (en) * 1997-06-24 1999-08-17 Imation Corp. Photothermographic element with iridium and copper doped silver halide grains
US6117624A (en) * 1993-06-04 2000-09-12 Eastman Kodak Company Infrared sensitized, photothermographic article
US6171707B1 (en) 1994-01-18 2001-01-09 3M Innovative Properties Company Polymeric film base having a coating layer of organic solvent based polymer with a fluorinated antistatic agent
US7468241B1 (en) 2007-09-21 2008-12-23 Carestream Health, Inc. Processing latitude stabilizers for photothermographic materials
US7524621B2 (en) 2007-09-21 2009-04-28 Carestream Health, Inc. Method of preparing silver carboxylate soaps
US7622247B2 (en) 2008-01-14 2009-11-24 Carestream Health, Inc. Protective overcoats for thermally developable materials
CN101256346B (zh) * 2008-02-04 2010-09-29 黄山银江科技有限公司 一种激光照排胶片的生产方法
WO2015148028A1 (fr) 2014-03-24 2015-10-01 Carestream Health, Inc. Matières d'imagerie développables thermiquement
WO2016073086A1 (fr) 2014-11-04 2016-05-12 Carestream Health, Inc. Matériaux de formation d'images, préparations et compositions
WO2016195950A1 (fr) 2015-06-02 2016-12-08 Carestream Health, Inc. Procédés et matériaux d'imagerie développables thermiquement
WO2017123444A1 (fr) 2016-01-15 2017-07-20 Carestream Health, Inc. Procédé de préparation de savons de carboxylate d'argent

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE604859A (fr) * 1960-06-10

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1290794A (en) * 1917-05-24 1919-01-07 Eastman Kodak Co Colored photographic element and process of making the same.
US1844716A (en) * 1929-04-19 1932-02-09 Eastman Kodak Co Process of making photographic emulsions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1290794A (en) * 1917-05-24 1919-01-07 Eastman Kodak Co Colored photographic element and process of making the same.
US1844716A (en) * 1929-04-19 1932-02-09 Eastman Kodak Co Process of making photographic emulsions

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527268A (en) * 1944-10-30 1950-10-24 Ilford Ltd Production of photographic emulsions
US2527261A (en) * 1944-10-30 1950-10-24 Ilflord Ltd Production of photographic silver halide emulsions from gelatinanion soap complexes
US2527267A (en) * 1944-10-30 1950-10-24 Ilford Ltd Photographic layers containing gelatin-sulfonic acid complexes, and their preparation
US2527263A (en) * 1945-11-19 1950-10-24 Ilford Ltd Photographic transfer materials bearing gelating anion soap complex silver halide layer
US2728662A (en) * 1947-08-13 1955-12-27 Eastman Kodak Co Method of preparing photographic emulsions
US2614928A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing photographic emulsions
US2614929A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing photographic emulsions
US2614931A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing cellulose ester-silver-halide photographic emulsions
US2614930A (en) * 1947-08-13 1952-10-21 Eastman Kodak Co Method of preparing polyvinyl alcohol-silver halide photographic emulsions
US2618556A (en) * 1947-11-19 1952-11-18 Eastman Kodak Co Process for preparing photographic emulsions
US2953455A (en) * 1957-08-28 1960-09-20 Du Pont Photographic silver halide emulsions containing a ruthenium, palladium or platinum hydroxide in stabilizing amounts and process for preparing the same
US3007796A (en) * 1959-02-25 1961-11-07 Gen Foods Corp Process for preparing photographic emulsions
US3067035A (en) * 1959-04-01 1962-12-04 Du Pont Gelatin-anion soap complex dispersion in polyvinyl alcohol photographic emulsions
US3142568A (en) * 1961-03-13 1964-07-28 Du Pont Photographic emulsions, elements, and processes
US4357419A (en) * 1981-04-02 1982-11-02 Minnesota Mining And Manufacturing Company Covering power in films
EP0115351A2 (fr) 1983-01-28 1984-08-08 Fuji Photo Film Co., Ltd. Matériel photosensible aux halogénures d'argent
US6117624A (en) * 1993-06-04 2000-09-12 Eastman Kodak Company Infrared sensitized, photothermographic article
US6171707B1 (en) 1994-01-18 2001-01-09 3M Innovative Properties Company Polymeric film base having a coating layer of organic solvent based polymer with a fluorinated antistatic agent
US5492804A (en) * 1994-06-30 1996-02-20 Minnesota Mining And Manufacturing Company Chromogenic leuco redox-dye-releasing compounds for photothermographic elements
US5696289A (en) * 1994-06-30 1997-12-09 Minnesota Mining And Manufacturing Company Blocked leuco dyes for photothermographic elements
US5705676A (en) * 1994-06-30 1998-01-06 Minnesota Mining And Manufacturing Company Chromogenic leuco redox-dye-releasing compounds for photothermographic elements
US5492805A (en) * 1994-06-30 1996-02-20 Minnesota Mining And Manufacturing Company Blocked leuco dyes for photothermographic elements
EP0691569A1 (fr) 1994-07-04 1996-01-10 Kodak-Pathe Emulsion photographique à sensibilité améliorée
US5928857A (en) * 1994-11-16 1999-07-27 Minnesota Mining And Manufacturing Company Photothermographic element with improved adherence between layers
US5492803A (en) * 1995-01-06 1996-02-20 Minnesota Mining And Manufacturing Company Hydrazide redox-dye-releasing compounds for photothermographic elements
US5891615A (en) * 1997-04-08 1999-04-06 Imation Corp. Chemical sensitization of photothermographic silver halide emulsions
US5939249A (en) * 1997-06-24 1999-08-17 Imation Corp. Photothermographic element with iridium and copper doped silver halide grains
US6060231A (en) * 1997-06-24 2000-05-09 Eastman Kodak Company Photothermographic element with iridium and copper doped silver halide grains
US7468241B1 (en) 2007-09-21 2008-12-23 Carestream Health, Inc. Processing latitude stabilizers for photothermographic materials
US7524621B2 (en) 2007-09-21 2009-04-28 Carestream Health, Inc. Method of preparing silver carboxylate soaps
US7622247B2 (en) 2008-01-14 2009-11-24 Carestream Health, Inc. Protective overcoats for thermally developable materials
CN101256346B (zh) * 2008-02-04 2010-09-29 黄山银江科技有限公司 一种激光照排胶片的生产方法
WO2015148028A1 (fr) 2014-03-24 2015-10-01 Carestream Health, Inc. Matières d'imagerie développables thermiquement
US9335623B2 (en) 2014-03-24 2016-05-10 Carestream Health, Inc. Thermally developable imaging materials
WO2016073086A1 (fr) 2014-11-04 2016-05-12 Carestream Health, Inc. Matériaux de formation d'images, préparations et compositions
US9523915B2 (en) 2014-11-04 2016-12-20 Carestream Health, Inc. Image forming materials, preparations, and compositions
WO2016195950A1 (fr) 2015-06-02 2016-12-08 Carestream Health, Inc. Procédés et matériaux d'imagerie développables thermiquement
US9746770B2 (en) 2015-06-02 2017-08-29 Carestream Health, Inc. Thermally developable imaging materials and methods
WO2017123444A1 (fr) 2016-01-15 2017-07-20 Carestream Health, Inc. Procédé de préparation de savons de carboxylate d'argent

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DE820853C (de) 1951-11-12
GB580504A (en) 1946-09-10
FR919657A (fr) 1947-03-14

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