DE266237C - - Google Patents
Info
- Publication number
- DE266237C DE266237C DENDAT266237D DE266237DA DE266237C DE 266237 C DE266237 C DE 266237C DE NDAT266237 D DENDAT266237 D DE NDAT266237D DE 266237D A DE266237D A DE 266237DA DE 266237 C DE266237 C DE 266237C
- Authority
- DE
- Germany
- Prior art keywords
- tablets
- potash
- sulfite
- salts
- photographic
- Prior art date
- 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.)
- Active
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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
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
- G03C5/265—Supplying of photographic processing chemicals; Preparation or packaging thereof of powders, granulates, tablets
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Description
KAISERLICHESIMPERIAL
PATENTAMT.PATENT OFFICE.
PATENTSCHRIFTPATENT LETTERING
- te 266237 KLASSE 57b. GRUPPE- te 266237 CLASS 57b. GROUP
CHEMISCHE FABRIK von HEYDEN AKT.-GES. in RADEBEUL β. DRESDEN.CHEMICAL FACTORY by HEYDEN AKT.-GES. in RADEBEUL β. DRESDEN.
Herstellung von in Wasser rasch löslichen Tabletten, besonders für photographische Zwecke.Manufacture of tablets which are rapidly soluble in water, especially for photographic purposes.
Photographische Entwickler werden vielfach in der Weise in den Handel gebracht, daß die zur Herstellung des Entwicklungsbades erforderlichen Reagenzien in Tablettenform geliefert werden. Das Entwicklungsbad enthält bekanntlich neben leicht oxydablen, organischen Stoffen, wie Hydrochinon, Methyl-p-aminophenol usw., ein anorganisches Reduktionsmittel, wie Alkalisulfit, und alkalisch wirkende Substanzen, besonders Alkalikarbonate. Es ist bereits versucht worden, Tabletten aus diesen drei Bestandteilen herzustellen. Organische. Entwickler sind aber viel zu empfindlich gegen alkalisch wirkende Substanzen, um mit ihnen zu Tabletten gepreßt ein haltbares Handelsprodukt zu geben. Tatsächlich werden daher im Handel die Entwicklertabletten in der Regel schon in der Weise vertrieben, daß zum Ansetzen des Entwicklungsbades jedesmal zwei getrennt hergestellte Tabletten verwendet werden, von denen die eine den betreffenden organischen Entwickler, die andere das Alkali enthält. Das Sulfit wird meist dem letzteren zugemischt.Photographic developers are widely marketed in such a way that the reagents required for the preparation of the developing bath are supplied in tablet form will. As is well known, the developing bath contains, in addition to easily oxidizable, organic ones Substances such as hydroquinone, methyl-p-aminophenol, etc., an inorganic reducing agent, such as alkali sulfite, and alkaline substances, especially alkali carbonates. It is Attempts have already been made to produce tablets from these three components. Organic. Developers, however, are far too sensitive to alkaline substances to work with Pressed into tablets to give a durable commercial product. Indeed, therefore in the trade the developer tablets are usually already marketed in such a way that for Preparing the developing bath used two separately prepared tablets each time one of which is the organic developer in question, the other the alkali contains. The sulfite is usually mixed with the latter.
Zur Herstellung solcher Tabletten ohne organischen Entwickler für photographische Zwecke wird nun bisher fast ausschließlich Natriumsulfit benutzt. Die hiermit hergestellten Tabletten zeigen aber den großen Übelstand, daß sie sich, besonders wenn sie längere Zeit gelagert haben, in Wasser verhältnismäßig schwer lösen, wie man leicht durch Untersuchung einer größeren Reihe von aus dem Detailhandel entnommenen Tabletten feststellen kann.For the production of such tablets without an organic developer for photographic applications Purposes has now been used almost exclusively sodium sulfite. The hereby produced Tablets, however, show the great disadvantage that they are proportionate in water, especially if they have been stored for a long time difficult to solve, as can be easily solved by examining a large number of tablets taken from retail stores can determine.
Die vorliegende Erfindung besteht darin, daß man bei der Herstellung von Tabletten für photographische Zwecke ausschließlich Kalisalze verwendet, also z. B. Kaliumsulfit und Pottasche an Stelle der bisher zur Herstellung von Entwicklern verwendeten Natronsalze oder Natron- und Kalisalzgemische. Die nur Kali- keine Natronsalze enthaltenden Tabletten zerfallen mit Wasser sofort und lösen sich außerordentlich leicht (meist innerhalb einer Minute) und behalten diese Eigenschaften auch bei längerem Liegen.The present invention consists in making tablets only used potash salts for photographic purposes, e.g. B. potassium sulfite and potash instead of the sodium salts previously used to make developers or mixtures of soda and potash salts. The tablets containing only potassium and no sodium salts disintegrate immediately with water and dissolve extremely easily (usually within a minute) and retain these properties even when lying down for a long time.
Man hat nun zwar vorgeschlagen, auch Entwickle rtabletten herzustellen, bei denen nur Kalisalze verwendet werden; hierbei wurde aber der organische Entwickler direkt mit dem Sulfit und dem betreffenden alkalisch wirkenden Salz gemischt. Der Zweck dieses Vorschlages war lediglich, die zur Entwicklung erforderlichen Substanzen sämtlich in einer Tablette in leicht handlicher Form zu vereinigen. Der Gedanke, der -dem vorliegenden Verfahren zugrunde liegt, nämlich besonders leicht lösliche, leicht zerfallende Tabletten herzustellen, die zugleich genügende Haltbarkeit aufweisen, ist dagegen bisher nicht verwirklicht worden. Die nach demIt has now been proposed that rtabletten also develop developer in which only Potash salts are used; but here the organic developer was directly involved the sulfite and the relevant alkaline salt mixed. The purpose of this The only suggestion was to put all of the substances required for development in one tablet in an easy-to-use form. The thought of -the present Process is based, namely particularly easily soluble, easily disintegrating tablets produce which at the same time have sufficient durability, however, has not yet been realized. The after
vorliegenden Verfahren hergestellten Tabletten haben gegenüber den bisher bekannten den Vorzug, praktisch unbegrenzte Haltbarkeit mit außerordentlicher Leichtlöslichkeit, selbst nach langem Lagern, zu vereinigen.The present method produced tablets have compared to the previously known Advantage, practically unlimited shelf life with extraordinary ease of solubility, even after long storage to unite.
Die Mischung von Pottasche und Natriumsulfit gibt zwar unter gewissen Bedingungen auch Tabletten, welche im frisch gepreßten Zustande leicht mit Wasser zerfallen und sichThe mixture of potash and sodium sulfite is true under certain conditions also tablets which, when freshly pressed, easily disintegrate with water and separate
to darin verhältnismäßig rasch lösen; sie verlieren jedoch diese Eigenschaften nach längerem Liegen stets, wahrscheinlich infolge Bildung von Kali-Natron-Doppelsalzen.to solve it relatively quickly; however, they lose these properties after a long period of time Always lying there, probably as a result of the formation of potassium and soda double salts.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE266237T |
Publications (1)
Publication Number | Publication Date |
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DE266237C true DE266237C (en) |
Family
ID=5997343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DENDAT266237D Active DE266237C (en) |
Country Status (1)
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DE (1) | DE266237C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0569852A1 (en) * | 1992-05-13 | 1993-11-18 | Fuji Photo Film Co., Ltd. | Bleach-fixing composition for color photographic material and method for processing a color photographic material with the same |
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0
- DE DENDAT266237D patent/DE266237C/de active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0569852A1 (en) * | 1992-05-13 | 1993-11-18 | Fuji Photo Film Co., Ltd. | Bleach-fixing composition for color photographic material and method for processing a color photographic material with the same |
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