US1404737A - Sensitive cellulosic film and process for producing the same - Google Patents

Sensitive cellulosic film and process for producing the same Download PDF

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Publication number
US1404737A
US1404737A US450400A US45040021A US1404737A US 1404737 A US1404737 A US 1404737A US 450400 A US450400 A US 450400A US 45040021 A US45040021 A US 45040021A US 1404737 A US1404737 A US 1404737A
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Prior art keywords
film
sensitive
silver
same
producing
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US450400A
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Brandenberger Jaques Edwin
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Cellophane SA France
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Cellophane SA France
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Priority to US450400A priority Critical patent/US1404737A/en
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Publication of US1404737A publication Critical patent/US1404737A/en
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/494Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
    • G03C1/496Binder-free compositions, e.g. evaporated
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/494Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds

Definitions

  • This invention relates to photogra'iplhic films which are permeable to water and to a process for the preparation of the same.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Description

ED STATES JAQUES EDWIN BRANDENBERGER, 0F PARIS, FRANCE, ASSIGNOR TO LA SOGIETE LA CELLOPHANE, OF PARIS, FRANCE.
SENSITIVE CELLULOSIC FILM AND PROCESS FOR PRODUCING THE SAME.
No Drawing.
To all 1.0/1 am it may concern Be it known that I, JA UEs EDWIN BRANDENBERGER, citizen of the Republic of Switzerland, and resident of Paris, France, post-office address 16 Rue du Louvre, have invented a new and useful Sensitive Cellulosic Film and Process for Producing the Same, which improvements are fully set forth in the following specification.
This invention relates to photogra'iplhic films which are permeable to water and to a process for the preparation of the same.
Up to the present when photographic films which are permeable to water such as cellulose'(viscose) films were being prepared a sensitive salt, for example silver bromide had to be formed by successively treating the film in tw baths, for example one containing silver nitrate and the other potassium bromide, the silver bromide sensitive to light being formed in the interior of the mass. The silver bromide could not be made to penetrate the interior of the film by means f a silver bromide bath, because this substance is not soluble in water and it is well known that water is necessary in the preparation of photographic films from materials which are permeable to water.
The operation may be simplified by using a single bath in the following manner:
Silver iodide for example,which is a sensitive salt of the same category as the bromideis insoluble in water but soluble in an aqueous solution of potassium iodide.
According to the present invention an aqueous solution of potassium iodide is prepared in which silver iodide is dissolved until the solution is saturated.
Thereupon the film is immersed in the bath. As soon as it is sufiiciently impregnated it is withdrawn and squeezed and then soaked in water. The resulting dilution of the potassium iodide solution sets free a large quantity of silver iodide which is deposited in the interior of the film and renders the latter sensitive.
The same result can be obtained by using Specification of Letters Patent.
Application filed March 7, 1921.
Patented Jan. si, 1922.
Serial No. 450,400.
for example a warm solution of silver bromide in an alkaline bromide.
What I claim and desire to secure by Letters Patent is:-
l. The process for the production of sensitive cellulosic films for photographic purposes, which consists in impregnating the film with a solution of a silver halogen salt in a suitable solvent, and thereupon precipitating the said silver halogen salt within the said film by the action of a suitable liquid.
2. The process for the production of sensitive cellulosic films for photographic purposes, which consists in impregnating the film with. a solution of a silver halogen salt in a suitable solvent, and thereupon precipitating the said silver halogen salt within the said film by the action of water.
3. The process for the production of sensitive cellulosic films for photographic purposes, which consists in impregnating the film with a solution of a silver halogen salt in an alkali-halogen salt by heating it desired. squeezingthe impregnated film and thereupon precipitating the said silver halogen salt within the said film by the action of water.
4. The process for the production of sensitive cellulosic films for photographic purposes, which consists in impregnating the film with a solution f silver iodide in potassium iodide, squeezing the impregnated film and thereupon precipitating the said silver iodide within the said film by the action of water.
5. A sensitive cellulosic film for photographic purposes, essentially characterized by the fact that the entire film is impregnated with a sensitive salt of silver.
In testimony whereof I have signed this specification in the presence of two subscribing witnesses.
JAQUES EDWIN BRANDENBERGER.
Witnesses:
GEORGES PASCAL CARRIERE, GERMAINE MIoHIELs.
US450400A 1921-03-07 1921-03-07 Sensitive cellulosic film and process for producing the same Expired - Lifetime US1404737A (en)

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US450400A US1404737A (en) 1921-03-07 1921-03-07 Sensitive cellulosic film and process for producing the same

Applications Claiming Priority (1)

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US450400A US1404737A (en) 1921-03-07 1921-03-07 Sensitive cellulosic film and process for producing the same

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US1404737A true US1404737A (en) 1922-01-31

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