US2136968A - Photographic developer - Google Patents
Photographic developer Download PDFInfo
- Publication number
- US2136968A US2136968A US107736A US10773636A US2136968A US 2136968 A US2136968 A US 2136968A US 107736 A US107736 A US 107736A US 10773636 A US10773636 A US 10773636A US 2136968 A US2136968 A US 2136968A
- Authority
- US
- United States
- Prior art keywords
- developer
- hydroquinone
- thiocyanate
- potassium
- photographic developer
- 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.)
- Expired - Lifetime
Links
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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
-
- 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
- G03C5/29—Development processes or agents therefor
- G03C5/30—Developers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/135—Cine film
Definitions
- This invention relates to an agent for developing light sensitive photographic images and more particularly to a developing agent designed for quick development of silver images in a colloidal I l5
- a developing agent designed for quick development of silver images in a colloidal I l5
- certain other'developers which will produce fine grain butrequire 'very long periods of development, for example, as much as twenty-four hours or more.
- benzene type developer is meant a benzene derivative containing at least two groups selected from the class consisting of hydroxy amino and sulfonic acids and preferably hydroxy or amino.
- Any soluble stable thiocyanate, such as KSCN must be employed, and the compound may be incorporated in quantities ranging from one per- 40 cent downward, normally to as low as based on the organic developing agents.
- the solution may be used as shown, or with equal parts or water.
- the solution should be diluted with tour parts of water.
- the solution may be diluted with 5 4, or 5 parts of water.
- Y l 20 1 A halo-hydroquinone and hydroxymethylparaminophenol sulfate.
- the thiocyanate is efiective with benzene type .developers in general.
- a photographic developer comprising approximately equal proportions of mon'o-chlorohydroquinone, methyl-ortho-amlno-phenol sulfate and .02 rto 1 percent of a thiocyanate based on the total weight of the developers.
- a photographic developer having substantially the following formula:
- a rapidly acting photographic developer comprising a. salt of a primary aryl amine developer, a halogenated hydroquinone and a thiocyanate, the thiocyanate being present in amount from approximately .02% to 1%, based on the organic developers present.
Description
Patented Nov. 15, 1938 UNITED STATES 2,136,968 PATENT. OFFICE PHOTOGRAPHIO DEVELOPER.
Albert n. Doran, Hollywood, calm, ammo: to Carns Chemical Company, Inc., a corporation of Illinois No Drawing. Application October 26, 19st,
Glaims.
This invention relates to an agent for developing light sensitive photographic images and more particularly to a developing agent designed for quick development of silver images in a colloidal I l5 On the other hand, there are available certain other'developers which will produce fine grain butrequire 'very long periods of development, for example, as much as twenty-four hours or more.
tion of fine grain images without resultant decrease in the speed of development. By "benzene type developer is meant a benzene derivative containing at least two groups selected from the class consisting of hydroxy amino and sulfonic acids and preferably hydroxy or amino.
The addition of minute amounts of a thic- 30 cyanate has proved particularly advantageous in connection with such compounds in accelerating the speed of thedevelopment without producing enlarged grain size. The amount of'thiocyanate must be kept quite low because higher quantities 5 'act as silver solvents and adversely affect the films.
Any soluble stable thiocyanate, such as KSCN must be employed, and the compound may be incorporated in quantities ranging from one per- 40 cent downward, normally to as low as based on the organic developing agents.
The following is an example of a suitable photo graphic developer for use on motion picture films.
5 Moho-chlom-hydroquinone.---grams The following example is a suitable formula 55 for fine grain positive development or the development of flne grain plates from a negative,.
either of sensitized paper, motion picture film, or other light sensitive mediums. Like the preceding formula, it may be modified to suit the re- 60 quirements or the worker. For developing the While these products produce It has now been discovered that the addition of a halogenated hydroquinone to a salt of a primary aryl amine developer results in the produc therefrom, but the appended claims should be Serial No. 107,736
ordinary sensitized paper. the solution may be used as shown, or with equal parts or water. For enlarging papers the solution should be diluted with tour parts of water. For negative and panchromatic film the solution may be diluted with 5 4, or 5 parts of water. v
Mono-chloro-hydroquinone grams.. 1. 5 Methyl-ortho-amino-phenolsmfntp (In 1.5 Potassium thiocyanate ..do 8 Sodium sulflte do 80 Hydroquinrmn (19 3 Sodium carbonate do 0 v Potassium bromide -do 1 Potassium metabisuliite do 1 Water c. 0.... 1
The following are additional examples of materials which in combinationproduce suitable developers: Y l 20 1 A halo-hydroquinone and hydroxymethylparaminophenol sulfate.
.2. A chloro-hydroquinone and mono-methyb' paraminophenol sulfate.
3. A halo-hydroquinone andmethyl-ortho-amino-phenol sulfate;
4. A halo-hydroquinone hydrochloride.
The reason for the eflect of the halogenated or the thiocyanate compound upon the other developer is not understood. It is possible that the presence oi the halogen has some eiiect upon the release or interchange of halogen radicals upon the silver in the film.
The thiocyanate is efiective with benzene type .developers in general.
The foregoing detailed description has been given for clearness of understanding only and no unnecessary limitations should be understood and diphenyl-aminoconstrued as broadly as permissible in viewoi' .the prior art.
I claim:
Q 1. A photographic developer comprising approximately equal proportions of mon'o-chlorohydroquinone, methyl-ortho-amlno-phenol sulfate and .02 rto 1 percent of a thiocyanate based on the total weight of the developers.
2. A photographic developer havingsubstantially the following formula:
Mono-chloro-hydroquinonegrams 1.5 Methyl ortho amino phenol sulfate h g' ams 1.5
Potassium thiocyanatedo .003 Sodium sulflte do Hydroquinone do 5 Borax do 5 Water 0 c- 1000 30 tially the following formula:
Mono-chloro-hydroquinonegrams Methyl ortho amino phenol sulfate 5 gra.ms Potassium thiocya'nate do Sodium sulfite do Hydroquinone do Sodium carbonate do 10 Potassium bromide do Potassium metabisulfite do Water o. c
4. A rapidly acting photographic developer comprising a. salt of a primary aryl amine developer, a halogenated hydroquinone and a thiocyanate, the thiocyanate being present in amount from approximately .02% to 1%, based on the organic developers present.
5. A developer as set forth in claim 4 in which the thiocyanate is potassium thlocyanate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US107736A US2136968A (en) | 1936-10-26 | 1936-10-26 | Photographic developer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US107736A US2136968A (en) | 1936-10-26 | 1936-10-26 | Photographic developer |
Publications (1)
Publication Number | Publication Date |
---|---|
US2136968A true US2136968A (en) | 1938-11-15 |
Family
ID=22318189
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US107736A Expired - Lifetime US2136968A (en) | 1936-10-26 | 1936-10-26 | Photographic developer |
Country Status (1)
Country | Link |
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US (1) | US2136968A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2466423A (en) * | 1945-05-11 | 1949-04-05 | Eastman Kodak Co | Fine-grain developers |
US2477323A (en) * | 1945-07-02 | 1949-07-26 | Harris Seybold Potter Co | Photographic developers |
US2553498A (en) * | 1947-11-18 | 1951-05-15 | Gen Aniline & Film Corp | First developer for multilayer color film of the reversal type |
US4168166A (en) * | 1977-11-09 | 1979-09-18 | Polaroid Corporation | Photographic processing composition comprising borate |
-
1936
- 1936-10-26 US US107736A patent/US2136968A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2466423A (en) * | 1945-05-11 | 1949-04-05 | Eastman Kodak Co | Fine-grain developers |
US2477323A (en) * | 1945-07-02 | 1949-07-26 | Harris Seybold Potter Co | Photographic developers |
US2553498A (en) * | 1947-11-18 | 1951-05-15 | Gen Aniline & Film Corp | First developer for multilayer color film of the reversal type |
DE968447C (en) * | 1947-11-18 | 1958-02-20 | Gen Aniline & Film Corp | Process for the uniform development of exposed, multilayer color reversal films |
US4168166A (en) * | 1977-11-09 | 1979-09-18 | Polaroid Corporation | Photographic processing composition comprising borate |
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