US1667589A - Process of manufacturing photographic silver halid emulsions - Google Patents

Process of manufacturing photographic silver halid emulsions Download PDF

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Publication number
US1667589A
US1667589A US122038A US12203826A US1667589A US 1667589 A US1667589 A US 1667589A US 122038 A US122038 A US 122038A US 12203826 A US12203826 A US 12203826A US 1667589 A US1667589 A US 1667589A
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US
United States
Prior art keywords
emulsion
emulsions
photographic silver
electro
silver halid
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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
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US122038A
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English (en)
Inventor
Dieterle Walter
Matthies Otto
Reitstotter Josef
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IG Farbenindustrie AG
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IG Farbenindustrie AG
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Publication date
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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
    • G03C1/04—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

  • sensitivity of the emulsion depends in a high degree on the colloid employed. While it is easy to obtain with a certain type of gelatine a high sensitivity, other types of gelatine yield emulsions of practical y sufli- 10 cient sensitivity with great difliculity or not at all. It is possible, indeed, to increase the sensitivity to a certain extent by moderately heating it for some time, but this so-called ripening process must not be pushed further 1 than to a limit which may not be transgressed if the tendency of forming fog isto be avoided. Ripening-time and ripeningtemperature depend upon the sort of the colloid em loyed.
  • emulsion making substances which may be produced by electro-dialysis from pure or impure proteins, e. g., from gelatine or glue. These substances may be added to the raw materials of the emulsion,
  • the substances employable for this pur- 80 pose are prepared in known manner by electro-dialysis of aqueous solutions of proteins between diaphragms of definite potential.
  • aqueous solutions of gelatine or another protein are dialyzed between two diaphragms, various physical and chemical reactions take place at the same time.
  • Prod-- nets of ionic dispersity migrate to the electrodes and here they are discharged and precipitated.
  • a diminution of the elec- 40 trolyte is effected which causes the precipitation of certain proteins insoluble in pure water.
  • globulines e. g., are precipitated in the intermediate space by the electro-dialysis of glue.
  • a more or less large electrophoresis takes place.
  • colloidall dispersed protein-particles of unknown c emical constitution migrate through the diaphragms to the electrodes or to-the spaces extending in front of them. 60
  • the anode-substances are separated and be inspissated and solidify to a light yellow mass of conchoidal fracture, smelling in- I tensely of soap when wet;
  • the substances separated at the electrodes have the property of increasing the sensitivity of silver halid emulsions.
  • the pro ucts obtained at the anode or those obtained at the cathode or mixtures of both.
  • a gelatine for emulsions is worked up in known manner to a photographic emulsion which is eflicaciously ripened by; heating it at C. during 60 minutes.
  • the characteristic curve indicated in the drawing'by (1 corresponds to this emulsion.
  • This curve represents the relation between the densities of the developed emulsion and the logarithms of exposure.
  • the shape of the curve a shows that the emulsion has no greatsensitivitg beginning only at a rather high value of t abscissa, namely, 6. When ripening is pushed further the emulsion begins to fog.
  • the extracts from proteins produced by electro-dialysis are generally not neutral, but acid or alkaline. But in some emulsion making processes it is not advisable to change the concentration of hydrogen-ions by adding other substances. It is often useful therefore, to neutralize the electro-dialytically separated extracts by means of alkaline or acid agents and to dry them, if it 6 is necessary, by evaporating.
  • a process of making photographic s'ilver halid emulsions which comprises adding during emulsion making substances extract- 10 able from proteins by electro-dialysis.
  • Silver halid emulsions containing added i thereto substances extractable from proteins by electro-dialysis.
  • Photographic layers comprising silver halid emulsions containing added thereto substances extractable from proteins by electro-dialysis.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Peptides Or Proteins (AREA)
US122038A 1925-10-07 1926-07-12 Process of manufacturing photographic silver halid emulsions Expired - Lifetime US1667589A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE259538X 1925-10-07

Publications (1)

Publication Number Publication Date
US1667589A true US1667589A (en) 1928-04-24

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ID=5966865

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US122038A Expired - Lifetime US1667589A (en) 1925-10-07 1926-07-12 Process of manufacturing photographic silver halid emulsions

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US (1) US1667589A (enrdf_load_stackoverflow)
BE (1) BE335769A (enrdf_load_stackoverflow)
FR (1) FR619077A (enrdf_load_stackoverflow)
GB (1) GB259538A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3190752A (en) * 1961-12-26 1965-06-22 Fuji Photo Film Co Ltd High edge gradient silver halide emulsion

Also Published As

Publication number Publication date
FR619077A (fr) 1927-03-25
GB259538A (en) 1927-07-21
BE335769A (enrdf_load_stackoverflow)

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