AT93637B - Process for the production of light-sensitive cellulose films for photographic use. - Google Patents
Process for the production of light-sensitive cellulose films for photographic use.Info
- Publication number
- AT93637B AT93637B AT93637DA AT93637B AT 93637 B AT93637 B AT 93637B AT 93637D A AT93637D A AT 93637DA AT 93637 B AT93637 B AT 93637B
- Authority
- AT
- Austria
- Prior art keywords
- production
- light
- cellulose films
- film
- photographic use
- Prior art date
Links
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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Description
<Desc/Clms Page number 1>
EMI1.1
Zur Herstellung wasserdurchlässiger Filme, z. B. solcher aus Zellulose (Viskose), wird das empfindliche Salz, z. B. Bromsilber in der Weise erzeugt, dass man den Film nacheinander in zwei Bädern, z. B. in einem aus salpetersaurem Silber und dann in einem aus Bromkalium hergerichteten Bade behandelt.
EMI1.2
Anwendung eines Bromsilberbades zu bewirken, dass das Bromsilber in das Innere des Films eindringt ; denn dieses Salz ist in Wasser nicht löslich, und anderseits ist man genötigt, bei der Herstellung von photographischen Filmen aus wasserdurchlässigen Filmen, Wasser zu verwenden.
Will man aber durch Benutzung nur eines einzigen Bades die Behandlung dennoch vereinfachen, so verfährt man erfindungsgemäss folgendermassen : Betrachtet man beispielsweise Jodsilber, das in Hinsicht auf Empfindlichkeit dem Bromsilber gleichwertig ist, so weiss man, das dieses Salz zwar in Wasser unlöslich aber in einer wässerigen Lösung von Jodkalium löslich ist.
Gemäss der Erfindung wird eine wässerige Lösung von Jodkalium hergestellt, in der Jodsilber bis zur Sättigung gelöst wird. In dieses Bad wird der Film eingebracht und sobald er genügend imprägniert ist, herausgenommen, worauf man die überschüssige Flüssigkeit ausdrückt und dann den Film in Wasser taucht. Die hiebei stattfindende Verdünnung der Jodkaliumlösung bewirkt, dass eine beträchtliche Menge Jodsilber frei wird, das sich im Innern des Films niederschlägt und diesen empfindlich macht. Das gleiche Resultat kann beispielsweise bei Verwendung einer warmen Lösung von Bromsilber in alkalischen Bromiden erreicht werden.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
EMI1.1
For the production of water-permeable films, e.g. B. those made of cellulose (viscose), the sensitive salt, z. B. bromide generated in such a way that the film is successively in two baths, for. B. treated in a bath made of nitric acid silver and then in a bath made from potassium bromide.
EMI1.2
Using a silver bromide bath to cause the silver bromide to penetrate the interior of the film; because this salt is not soluble in water, and on the other hand it is necessary to use water in the production of photographic films from water-permeable films.
However, if you want to simplify the treatment by using only a single bath, the procedure according to the invention is as follows: If, for example, you consider silver iodine, which is equivalent to silver bromine in terms of sensitivity, you know that this salt is insoluble in water but in an aqueous one Solution of potassium iodide is soluble.
According to the invention, an aqueous solution of potassium iodine is produced in which silver iodine is dissolved until it is saturated. The film is placed in this bath and, as soon as it is sufficiently impregnated, removed, whereupon the excess liquid is squeezed out and the film is then immersed in water. The dilution of the potassium iodide solution that takes place in this process causes a considerable amount of silver iodine to be released, which is deposited inside the film and makes it sensitive. The same result can be achieved, for example, using a warm solution of silver bromide in alkaline bromides.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR93637X | 1920-04-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT93637B true AT93637B (en) | 1923-07-25 |
Family
ID=8804905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT93637D AT93637B (en) | 1920-04-19 | 1921-01-31 | Process for the production of light-sensitive cellulose films for photographic use. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT93637B (en) |
-
1921
- 1921-01-31 AT AT93637D patent/AT93637B/en active
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