US2614929A - Method of preparing photographic emulsions - Google Patents

Method of preparing photographic emulsions Download PDF

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Publication number
US2614929A
US2614929A US768476A US76847647A US2614929A US 2614929 A US2614929 A US 2614929A US 768476 A US768476 A US 768476A US 76847647 A US76847647 A US 76847647A US 2614929 A US2614929 A US 2614929A
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United States
Prior art keywords
gelatin
derivative
silver
halide
silver halide
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Expired - Lifetime
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US768476A
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English (en)
Inventor
Henry C Yutzy
Frederick J Russell
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Eastman Kodak Co
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Eastman Kodak Co
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Publication date
Priority to BE484325D priority Critical patent/BE484325A/xx
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US768475A priority patent/US2614928A/en
Priority to US768476A priority patent/US2614929A/en
Priority to GB7274/48A priority patent/GB649546A/en
Priority to GB7273/48A priority patent/GB649545A/en
Priority to FR980386D priority patent/FR980386A/fr
Application granted granted Critical
Publication of US2614929A publication Critical patent/US2614929A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03C1/04—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming substances
    • G03C1/047—Proteins, e.g. gelatine derivatives; Hydrolysis or extraction products of proteins

Definitions

  • This invention relates to a method for prep-aring washed silver-halide photographic emulsions in which the silver halide is preparedin a solution of gelatin, mixed with gelatin derivative, acidcoagulated, washed, and then re-dispersed.
  • gelatin has been principally depended upon as the carrier for the silver halide and as the peptizing agent employedin its preparation.
  • the emulsion maker has in the past been limited in the scope of his operations bythe physical properties peculiar to gelatin.
  • our invention involves the mixing of gelatin derivatives into dispersions of silver halide in gelatin in sufficient amount to impart coagulating properties to the entire mass.
  • the gelatin derivatives which are employed in accordance with our-invention may bepreparedlfrom gelatin by adjusting: a solution or suspension of gelatin to a pH value of 8 to 11 or more with a suitable base, such as sodium hydroxide or ammonium hydroxide and then adding a reagent which will react therewith, ordinarily at a temperature of 25-60 C.
  • a suitable base such as sodium hydroxide or ammonium hydroxide
  • the reaction between the reagent and the gelatin usually takes 5-20minutes after which the gelatin derivative may be employed either in the solution in which it is formedor in solid condition.
  • gelatin derivatives which have been found to be especially useful in the process in accordance with our invention are those of the aromatic sulfonyl chlorides, the carboxylic acid chlorides, the carboxylic' acid anhydrides, especially of the dicarboxylic type, the aryl isocyanates, and the IA-diketones.
  • the following" compounds have been found to be useful for preparing gelatin derivatives suitable for use in our invention:
  • our invention comprises the formation of the silver-halide grains in an aqueous solution of gelatin whereby good dispersion is obtained followed by the addition to this solution of a gelatin derivative in sufficient proportion to impart coagulating properties to the
  • the amount of gelatinderivative which must be added to insure satisfactory coagulation is determined by two features: (1) the concentration of normal gelatin which ..is present and (2) the concentration of salt which is
  • the ratio of gelatin derivative to normal gelatin should be of the order of 4 to 1. If large quantities of salt are present, the ratio of the gelatin derivative to the gelatin may be as little as 2 to 1 for good emulsion coagulation properties.
  • the silver-halide dispersion is prepared in normal gelatin in accordance with the usual procedure.
  • the silver-halide formation and such ripening as is desired is carried out.
  • gelatin derivative in an amount which will give the mass the property of being acid coagulable.
  • This may be a proportion of gelatin derivative of 2 to l derivative to gelatin, 4 to l, or, if desired, an even larger proportion of gelatin derivative may be added, although as a practical matter, proportions of less than to l are most satisfactory.
  • the gelatin derivative is thoroughly stirred into the silver-halide dispersion whereupon acid is added to reduce the pH to less than 4.5, the amount of salt present determining the lower limit of the pH range. If the nitrate resulting as a by-product from the preparation of the silver halide is present, the pH may be reduced to 3 and coagulation will be obtained in this case, the salt being on the order of approximately 0.2 normal. If for some reason higher concentrations of salt are present, a still greater range of pH may be employed for the coagulation. Upon reducing the pH tothe coagulation range, the gelatin derivative coagulates and carries down the gelatin and silver halide therewith.
  • the phenomenon which occurs is characterized by an enveloping of the silver-halide grains by the coagulated gelatin derivative so that a rainy mass is obtained. This mass may then be subjected to repeated washings, thereby removing substantially all of the water-soluble salts from the coagulum.
  • the coagulum may be employed directly without any further washing than the removal of the mother liquor from the precipitated material.
  • extended washing is not necessary.
  • the coagulum- may be rinsed by treatment with cool water, preferably with a pH adjusted to the isoelectric point of the gelatin derivative.
  • the number of rinses necessary to reduce the salt content of the coagulum to the desired point is usually within the range of l to 4 changes of water.
  • the coagulum may be dissolved in water at an elevated pH, such as by using wat r taining a small proportion of sodium or ammonium hydroxide to bring the pH of the mass up to 6 or more.
  • the temperature of the mass is raised to approximately 40 0., and the Whole is stirred for a few minutes to effect re-dispersion of the coagulum.
  • the gelatin derivative may be coagulated by the addition of an appropriate acid solution to reduce the pH to the coagulation point of the derivative.
  • the coagulum will settle and is separated from the mother liquor in the same manner as in the first coagulation step.
  • the coagulation and re-dispersion operation may be repeated as often as necessary but for normal purposes one cycle of washing is suflicient.
  • the coagulum which has been washed by either of the two general methods outlined above may then be re-dispersed to form photographic emulsions suitable for the subsequent finishing and coating operations by treating with the required quantity of water, normal gelatin or gelatin derivative and base to raise the pH of the Whole to 5 or 6 or even greater.
  • the mixture of coagulum, water, gelatin or gelatin derivative and any other materials which have been added is then stirred at approximately 40 C. for the time required. to effect complete re-dispersal of the coagulum.
  • the time required is normally of the order of ten to twenty minutes but may vary depending upon the chemical nature of the particular gelatin derivative used.
  • the emulsion thus prepared behaves similarly to emulsions prepared using a similar emulsification and ripening technique in which noodle washing is employed.
  • the emulsions prepared in accordance with our invention respond readily to the standard methods of chemical sensitization or after ripening, and optical sensitization. They may be coated by the techniques usual in coating photographic emulsions.
  • the use of gelatin derivatives for obtaining washed emulsions presents considerable advantage over other techniques described in the literature for the washing of emulsions. It has been well known for years that gelatin silver-halide emulsions could be coagulated by the addition of suflicient quantities of suitable organic solvents of which methanol, ethanol, or acetone may serve as an example.
  • the dispersion was stirred for five minutes-at 40 C., after which approximately 20cc. of 5-N sulfuric acid were added to reduce the pH to 3.0. After standing at this pH for several minutes a coagulum of silver halide and gelatin settles out. The mother liquor was decanted 01f and the coagulum was redispersed in one liter of distilled water by stirring vigorously for five minutes at 40 C. There was then. added to the emulsion approximately 15 cc. of 3 N am- A 400 cc. portion of this emulsion was melted at 40 C. andB N ammonium hydroxide wasadded until the mixture was approximately neutral.
  • Example 2 To the second portion of the silver-halid dispersion prepared as described .in
  • Example 1 there was added 75 g. of the phenyl isocyanate derivative of gelatin, thereby imparting to the dispersion the .property of being acid coagulable.
  • gelatin derivative used here was preparedin the same mannerjas that of Example 1 except that phenylisocyanatewas employed instead of benzene sulfonyl chloride as the reagent.
  • the coagulation, decantation, washing, and finishing of the emulsion followed the same procedure as .in Example 1.
  • photographic proper A small amount of potassium bromide was added r according to the procedure well known in the art,
  • The' derivative employed was'prepared' by adding 10.5 g. of m-carboxy' benzene sulfonyl chloride in' 50 cc. of dry acetone to a solution of 100 810i gelatin in 900 cc. of water at 40 over aperiod "of two hours; The pH' of the gelatin solution was adjusted to 10.0 and maintained there by the use of 10% sodium hydroxide throughout the reaction. The pH was then adjusted to 7.0 with dilute sulfuric acid. The gelatin solution was se by chilling, sliced, washed and dried.
  • the emulsion obtained by the procedure described was washed by successive coagulations as described in Example 1, was brought to its final xvolume,land was finished and coated onto glass plates for sensitometrio tests. A photographic emulsion having good properties was obtained.
  • Example 5 The procedure described in Example 1 was followed except that in place of the benzene sulfonyl chloride derivative of gelatin 50g. ofp-tolylisocyanate derivative of gelatin was mixed with the silver-halide dispersion and after reduction of the pH to produce a 'coagulum, the mother liquor was decanted therefrom and the coagulum was redispersed in distilled water at 40 C. Recoagulation was obtained. byrai'sing 'the pH to 4.1 with 3 N ammonium hydroxide. The mother liquor wasdecanted off and after redispersing the coagulum in '75 g. of gelatin and sufficient water to adjust the weight to 1.36 kg. the emulsion was finished in the same manner as in Example 1. A portion of the finished emulsion was coated on glass plates and sensitometric tests showed that it had good'photographic properties.
  • Example 6 The procedure of Example 1 was followed except thatthe derivative obtained by reacting maleic anhydride with gelatin was employed to impart acid coagulability to the silverhalide dispersion.
  • the derivative employed was prepared by dissolving 50 g. of gelatin in 400 cc. of distilled water and adjusting the pH to 10 with sodium hydroxide. The mass was then,
  • Example 9 The procedurefollowed here was the same as that used in Example 7 except that v the coagulum-produced by acidifying the mixture of silver-halide dispersion and benzoyl chloride derivative of gelatin was washed twice in" cold water before final dispersion in the gelatin solution. The ammonia coagulation described in Examples '7 and'l was omitted. The final emulsion was finished by heat treatment and coated on I glass plates as described in Example 7. Sensitometric tests showed that the emulsion had satisfactory photographic properties.
  • Example 10 A silver-halide dispersion in gelatin was prepared as described in the first This dispersion was halved and to this half portion'was added 50 g. of abenzoyl chloride derivative of'gelatin as described in Example 7. To the resulting mixture 20: cc. of aqueous sulfuric acid was'added to reduce the pHtoB. A' coagulum of silver halide andgelatin formed and-was allowed to settle. The mother liquor was decanted from the coagulum, and the latter was redispersed in'one liter 'of distilled water at 40 C. and a pH of 6.5
  • Example 11 The procedure of the precedingexample was followed except that the. benzoyl chlorid derivative of gelatin was prepared from a glue stock instead of from high viscosity gelatin. The procedure of coagulating, washing, and decanting, final adjustment of composition, and finishing described in the examples above gave an emulsion having good sensitometric properties.
  • Example 12 The procedure described in Example! was followed except that the second half of the silver-halid dispersion prepared as described in Example 10 was employed with the exception that '75 'g. of the benzoyl chloride derivative of glue (or unrefined gelatin) was employed to impart acid. coagulating properties. to
  • the silver-halidedispersion wascoagulated, decanted and washed in cold water.
  • the coagulum was then dispersed in 75 g. of gelatin solution as the vehicle therefor and ad.- justed to a total weight of 1.36 kg.
  • This mixture was stirred for twentyminutes at 40 C. and1was then cooled to C. and chilled.
  • a test portion of 400 cc. was melted at C. giving heat treatment for approximately forty minutes at C. and was coated on glass plates. The platecoatings were exposed and werefound to givegood sensitometric results.
  • Example 13 The following solutions I were prepared: solution A, 200 cc: of aqueous solution containing 50 silver nitrate by weight; solution B, having a total volume of 200 cc. and containing 190 cc. of an aqueous solution containing 40% potassium bromide by weight and 9% cc. of a solution containing 25% potassium iodide by a weight, .65 g. of a polyvinyl.v alcohol solution containing 203% polyvinyl alcohol and 205 cc. of water stirred at 93 C. for fifteenminutes to assure complete solution of the. polyvinyl alcohol.
  • gelatin the aromatic isocyanate derivatives of gelatin and the 1,4 diketone derivatives of gelatin, the carboxylic acid anhydride derivahalide by adjusting to said pH whereby silver halide-polyvinyl alcohol-gelatin derivative grains areformed and. subsequently separating those grains. from the liquid portion of the mass.
  • a method of preparing washed silver halide dispersions the steps which comprise mixing a water-soluble silver salt and a water-soluble halide salt in an aqueous solution of a peptizing colloid, mixing therewith at least 2 parts of a carboxylic acid anhydride derivative of gelatin per part of the peptizing colloid, thereby rendering the silver halide dispersion coagulable at a pH Within therange of pH 3-4.5, coagulating the silver halide dispersion by adjusting to said pH whereby silver halide-peptizer-gelatin derivative 'grains are formed and subsequently separating the thus-formedgrains from the liquid portion of the mass.
  • a method of preparing washed silver halide dispersions the steps which comprise mixing a water-soluble silver salt and a water-soluble halide salt in an aqueous solution of gelatin as the peptizing colloid, mixing therewith at least 2 parts of a carboxylic acid anhydride dcrivative of gelatin per part of the peptizing colloid, thereby rendering the silver halide dispersion'coagulable at a pH'within the range ofpI-I 3-4.5, coagulating the silver halide dispersion by adjustingto said pH whereby silver halidegelatin-gelatin derivative grains are'formed and subsequently separating the thus-formed grains from the liquid portion of the mass.
  • a method of preparing Washed silver halide dispersions the steps which comprise mixing together a water-soluble silver salt and awatersoluble'halide salt in an aqueous solution of a peptizing colloid, mixing therewith at" least 2 parts of th benzene sulfonyl chloride derivative of gelatin'per part 'of the peptizing colloid; thereby rendering the silver halide dispersion 'coagulable at a pH within the rangeo'f pH-3-'4;5; coagulating the silver halide dispersion by adjusting to said pH whereby silver'lialide-peptizergelatin derivative grains are formed and subsequently separating those grains from the liquid portion of the mass.
  • a method-of preparing washed silverhalide dispersions the steps which comprise mixing together a water-soluble silver salt "and a water-soluble halide salt in an aqueous solution of a p eptizing colloid, mixing therewith at least 2 parts of the phenyl i'socyanate derivative of gelatin per part of the peptizing 'colloidy-"thereby rendering the silverhalide'dispersion coagulable at a pH within the range of pH 3-4.5, coagulating the silver halide dispersion by adjusting to said pH whereby silver halide peptizer-gelatin derivative grains are "formed and; subsequently separating" those grains fromthe liquid portion of the mass.
  • a method of preparing a washed'silver halide photosensitive emulsion which comprises mixinga water-soluble silver salt and a watersoluble halide salt in an" aqueous solution of a peptizing "colloid, mixing therewith 'at least 2 partsof the phthalic anhydride derivative of gelatin per part of the peptizing colloid, thereby renderingthe silver halide dispersion coagulable at a pH within the range of pH 3-4.5, coagulatingthe'silve'r halide dispersion by adjusting to said pH whereb'y silver halide-peptiZer-gelatin derivative grains are formed, separating those grains from the liquid portion of the mass and subsequent by mixing those grains with gelatin and water as a protective colloid for the silver halide whereby a photosensitive emulsion is formed, b q
  • a method of preparing washed silver halide dispersions the steps which comprise mixing a water-soluble silver salt and a watersoluble halide salt in an aqueous solution of a peptizing colloid, mixing therewith approximate- 1y 4 parts of a gelatin derivative per part of the pepti zing colloid, thereby rendering the silver halide'jdiSpersion coagulable at a pH within the range'of pI-I 3-4.5,which gelatin derivative is selected from the group consisting of the aromatic sulfonyl chloride derivatives of gelatin, the carboxylic acid chloride derivatives of gelatin, thecarboxylic acid anhydride derivatives of gelatin, the aromatic isocyanate derivatives of gelatin and the 1,4 diketone derivatives of gelatin, coagulating the dispersion of silver halide by adjusting to said pH whereby silver halidepeptizer-gelatin derivative grains are formed and subsequently separating those grains from the liquid portion of the mass.

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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)
  • Colloid Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US768476A 1947-08-13 1947-08-13 Method of preparing photographic emulsions Expired - Lifetime US2614929A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE484325D BE484325A (en)) 1947-08-13
US768475A US2614928A (en) 1947-08-13 1947-08-13 Method of preparing photographic emulsions
US768476A US2614929A (en) 1947-08-13 1947-08-13 Method of preparing photographic emulsions
GB7274/48A GB649546A (en) 1947-08-13 1948-03-09 Improvements in the production of photographic emulsions
GB7273/48A GB649545A (en) 1947-08-13 1948-03-09 Improvements in the production of photographic emulsions
FR980386D FR980386A (fr) 1947-08-13 1948-08-11 Procédé perfectionné de préparation d'émulsions photographiques et procufits enrésultant

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US2725294A (en) * 1952-07-17 1955-11-29 Eastman Kodak Co Hardening of gelatin with polyanhydrides
US2768079A (en) * 1954-01-25 1956-10-23 Eastman Kodak Co Method of preparing washed photographic emulsions
US2863769A (en) * 1954-09-03 1958-12-09 Du Pont Process of preparing silver halide dispersions
US2956880A (en) * 1957-01-04 1960-10-18 Eastman Kodak Co Preparation of washed emulsions and gelatin derivatives employed as peptizers in their preparation
US2982652A (en) * 1957-06-18 1961-05-02 Gevaert Photo Prod Nv Preparation of photographic emulsions
US3003878A (en) * 1957-12-04 1961-10-10 Eastman Kodak Co Photographic emulsions of improved flexibility and increased silver covering power
US3118766A (en) * 1962-05-31 1964-01-21 Polaroid Corp Photographic products and processes
US3138461A (en) * 1960-06-10 1964-06-23 Polaroid Corp Process for preparing silver halide emulsions containing gelatin derivatives
DE1191225B (de) * 1960-06-10 1965-04-15 Polaroid Corp Verfahren zur Herstellung von photographischen Ausflockungsemulsionen
DE1238330B (de) * 1962-09-13 1967-04-06 Ciba Geigy Verfahren zur Herstellung photographischer Silberhalogenidemulsionen nach der Flockungsmethode
DE1242448B (de) * 1960-06-10 1967-06-15 Polaroid Corp Verfahren zur Herstellung photographischer Silberhalogenidemulsionen mittels Ausflockung
US3359110A (en) * 1964-04-13 1967-12-19 Eastman Kodak Co Use of organic amides as anti-coagulants in emulsions prepared by the gelatin derivative coagulation wash procedure
US3873322A (en) * 1972-05-12 1975-03-25 Agfa Gevaert Method of preparing photographic silver halide emulsions
FR2307292A1 (fr) * 1975-04-09 1976-11-05 Agfa Gevaert Production d'emulsions photographiques aux halogenures d'argent
JPH02262643A (ja) * 1989-04-03 1990-10-25 Konica Corp ハロゲン化銀写真感光材料
US5273873A (en) * 1990-12-06 1993-12-28 Eastman Kodak Company Control of surface iodide using post precipitation KC1 treatment
EP0355568B1 (de) * 1988-08-20 1995-01-11 Agfa-Gevaert AG Herstellung einer Silberhalogenidemulsion
US5399480A (en) * 1993-09-14 1995-03-21 Eastman Kodak Company Attachment of gelatin-grafted polymer particles to pre-precipitated silver halide grains
EP0698817A1 (en) 1994-08-22 1996-02-28 Agfa-Gevaert N.V. Assortment of silver halide photographic industrial X-ray films and method of processing said assortment
US5994049A (en) * 1997-08-28 1999-11-30 Eastman Kodak Company Water-soluble non-interactive polymers and surfactant micelles for desalting and concentrating silver halide photographic emulsions
US6004740A (en) * 1997-08-28 1999-12-21 Eastman Kodak Company Water-soluble non-interactive carboxyl polymers for desalting and concentrating silver halide photographic emulsions

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US3201250A (en) * 1959-01-12 1965-08-17 Eastman Kodak Co Dimensionally stable gelatincontaining film product
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DE1472764A1 (de) * 1965-06-11 1969-03-27 Agfa Gevaert Ag Verfahren zur Haertung von photographischen,insbesondere gelatinehaltigen Schichten
GB1356573A (en) * 1970-06-05 1974-06-12 Agfa Gevaert Removal of dissolved products from a precipitate
JPS5033847B2 (en)) * 1971-09-27 1975-11-04
GB1414783A (en) * 1972-08-03 1975-11-19 Agfa Gevaert Preparation of silver halide emulsions
JPS5328211B2 (en)) * 1975-01-07 1978-08-12
JPS59137946A (ja) 1983-01-28 1984-08-08 Fuji Photo Film Co Ltd ハロゲン化銀感光材料
JPS61245151A (ja) 1985-04-23 1986-10-31 Konishiroku Photo Ind Co Ltd ハロゲン化銀写真感光材料
JPS61250643A (ja) 1985-04-30 1986-11-07 Konishiroku Photo Ind Co Ltd ハロゲン化銀写真感光材料
DE3682128D1 (de) 1985-07-17 1991-11-28 Konishiroku Photo Ind Photographisches silberhalogenidmaterial.
US4990439A (en) * 1988-08-03 1991-02-05 Konica Corporation Silver halide light-sensitive photographic material
FR2640634B1 (fr) * 1988-12-16 1991-04-05 Sanofi Sa Gelatine fluoree et procede d'obtention
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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
US5492805A (en) * 1994-06-30 1996-02-20 Minnesota Mining And Manufacturing Company Blocked leuco dyes for photothermographic elements
FR2722009A1 (fr) 1994-07-04 1996-01-05 Kodak Pathe Emulsion photografique a sensibilite ameloiree
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
EP0768570A1 (en) 1995-10-09 1997-04-16 Konica Corporation Image forming method
DE19637499A1 (de) * 1996-09-14 1998-03-26 Stoess & Co Gelatine Aufzeichnungsmaterial für die thermische Bildaufzeichnung
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
US5977190A (en) * 1998-01-14 1999-11-02 Eastman Kodak Company Process for deionizing and concentrating emulsions
ITSV20020023A1 (it) 2002-05-21 2003-11-21 Ferrania Spa Foglio recettore di inchiostro
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
EP2619628B1 (en) 2010-09-17 2014-03-26 Fujifilm Manufacturing Europe BV Photographic paper and its use in a photo album
US9335623B2 (en) 2014-03-24 2016-05-10 Carestream Health, Inc. Thermally developable imaging materials
US9523915B2 (en) 2014-11-04 2016-12-20 Carestream Health, Inc. Image forming materials, preparations, and compositions
US9746770B2 (en) 2015-06-02 2017-08-29 Carestream Health, Inc. Thermally developable imaging materials and methods
WO2017123444A1 (en) 2016-01-15 2017-07-20 Carestream Health, Inc. Method of preparing silver carboxylate soaps
GB202006061D0 (en) 2020-04-24 2020-06-10 Fujifilm Mfg Europe Bv Photographic paper

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US1844716A (en) * 1929-04-19 1932-02-09 Eastman Kodak Co Process of making photographic emulsions
GB479419A (en) * 1936-07-10 1938-02-04 Kodak Ltd Improvements in ripening and hardening photographic emulsions
US2139774A (en) * 1936-07-10 1938-12-13 Eastman Kodak Co Sensitizing and hardening photographic emulsions
GB537256A (en) * 1939-09-13 1941-06-16 Eastman Kodak Co Process employing non-diffusing compounds for use in colour photography and other photographic processes
US2282001A (en) * 1939-09-13 1942-05-05 Eastman Kodak Co Color-forming gelatin compound
GB580504A (en) * 1944-07-04 1946-09-10 Cecil Waller Improvements in or relating to the production of photographic silver halide emulsions
US2489341A (en) * 1944-07-04 1949-11-29 Ilford Ltd Production of photographic silver halide emulsions

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725295A (en) * 1952-07-17 1955-11-29 Eastman Kodak Co Hardening of gelatin with organic acid chlorides
US2725294A (en) * 1952-07-17 1955-11-29 Eastman Kodak Co Hardening of gelatin with polyanhydrides
US2768079A (en) * 1954-01-25 1956-10-23 Eastman Kodak Co Method of preparing washed photographic emulsions
US2863769A (en) * 1954-09-03 1958-12-09 Du Pont Process of preparing silver halide dispersions
US2956880A (en) * 1957-01-04 1960-10-18 Eastman Kodak Co Preparation of washed emulsions and gelatin derivatives employed as peptizers in their preparation
US2982652A (en) * 1957-06-18 1961-05-02 Gevaert Photo Prod Nv Preparation of photographic emulsions
US3003878A (en) * 1957-12-04 1961-10-10 Eastman Kodak Co Photographic emulsions of improved flexibility and increased silver covering power
DE1242448B (de) * 1960-06-10 1967-06-15 Polaroid Corp Verfahren zur Herstellung photographischer Silberhalogenidemulsionen mittels Ausflockung
US3138461A (en) * 1960-06-10 1964-06-23 Polaroid Corp Process for preparing silver halide emulsions containing gelatin derivatives
DE1191225B (de) * 1960-06-10 1965-04-15 Polaroid Corp Verfahren zur Herstellung von photographischen Ausflockungsemulsionen
DE1171264B (de) * 1962-05-31 1964-05-27 Polaroid Corp Verfahren zur Herstellung photo-graphischer Silberhalogenidemulsionen nach dem Ausflockungsverfahren
US3118766A (en) * 1962-05-31 1964-01-21 Polaroid Corp Photographic products and processes
DE1238330B (de) * 1962-09-13 1967-04-06 Ciba Geigy Verfahren zur Herstellung photographischer Silberhalogenidemulsionen nach der Flockungsmethode
DE1238330C2 (de) * 1962-09-13 1974-04-18 Ciba Geigy Verfahren zur Herstellung photographischer Silberhalogenidemulsionen nach der Flockungsmethode
US3359110A (en) * 1964-04-13 1967-12-19 Eastman Kodak Co Use of organic amides as anti-coagulants in emulsions prepared by the gelatin derivative coagulation wash procedure
US3873322A (en) * 1972-05-12 1975-03-25 Agfa Gevaert Method of preparing photographic silver halide emulsions
FR2307292A1 (fr) * 1975-04-09 1976-11-05 Agfa Gevaert Production d'emulsions photographiques aux halogenures d'argent
EP0355568B1 (de) * 1988-08-20 1995-01-11 Agfa-Gevaert AG Herstellung einer Silberhalogenidemulsion
JPH02262643A (ja) * 1989-04-03 1990-10-25 Konica Corp ハロゲン化銀写真感光材料
US5273873A (en) * 1990-12-06 1993-12-28 Eastman Kodak Company Control of surface iodide using post precipitation KC1 treatment
US5399480A (en) * 1993-09-14 1995-03-21 Eastman Kodak Company Attachment of gelatin-grafted polymer particles to pre-precipitated silver halide grains
US5543283A (en) * 1993-09-14 1996-08-06 Eastman Kodak Company Attachment of gelatin-grafted plymer particles to pre-precipitated silver halide grains
US5741633A (en) * 1993-09-14 1998-04-21 Eastman Kodak Company Attachment of gelatin-grafted polymer particles to pre-precipitated silver halide grains
EP0698817A1 (en) 1994-08-22 1996-02-28 Agfa-Gevaert N.V. Assortment of silver halide photographic industrial X-ray films and method of processing said assortment
US5994049A (en) * 1997-08-28 1999-11-30 Eastman Kodak Company Water-soluble non-interactive polymers and surfactant micelles for desalting and concentrating silver halide photographic emulsions
US6004740A (en) * 1997-08-28 1999-12-21 Eastman Kodak Company Water-soluble non-interactive carboxyl polymers for desalting and concentrating silver halide photographic emulsions

Also Published As

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GB649546A (en) 1951-01-31
GB649545A (en) 1951-01-31
FR980386A (fr) 1951-05-11
US2614928A (en) 1952-10-21

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