GB1200393A - Photographic element and process - Google Patents
Photographic element and processInfo
- Publication number
- GB1200393A GB1200393A GB43272/68A GB4327268A GB1200393A GB 1200393 A GB1200393 A GB 1200393A GB 43272/68 A GB43272/68 A GB 43272/68A GB 4327268 A GB4327268 A GB 4327268A GB 1200393 A GB1200393 A GB 1200393A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reducing agent
- metal
- emulsion
- sept
- agent
- 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
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
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/485—Direct positive emulsions
- G03C1/48538—Direct positive emulsions non-prefogged, i.e. fogged after imagewise exposure
- G03C1/48546—Direct positive emulsions non-prefogged, i.e. fogged after imagewise exposure characterised by the nucleating/fogging agent
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Abstract
1,200,393. Direct positive photographic elements. E.I. DU PONT DE NEMOURS & CO. Sept.11, 1968 [Sept.12, 1967], No.43272/68. Heading G2C. Unfogged photographic elements which after exposure to actinic radiation can be developed to give positive images directly, comprise a supported internal latent image type halide emulsion layer containing a water-permeable organic colloid binding agent and a metal compound reducing agent for the silver halide, the metal in the compound capable of exhibiting different valencies and the compound employed being one in which the metal does not exhibit its highest valency; the emulsion has a pH less than 7 and sufficiently low to prevent oxidation of the reducing agent. Preferably the reducing agent is Sn Cl 2 , Ti Cl 3 or ferrocent, the pH is lowered by H Cl, optionally together with borax, and the emulsion also contains a protective agent to prevent premature oxidation of the reducing agent (e.g. I 2 , a metal iodide, a spectral sensitizing dye or 2-mercapto - 4-phenylthiazole), Au ions (e.g. in the form of Au Cl 3 ), Pb(NO 3 ) 2 and/or Sn Cl 4 .
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US66707767A | 1967-09-12 | 1967-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1200393A true GB1200393A (en) | 1970-07-29 |
Family
ID=24676697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB43272/68A Expired GB1200393A (en) | 1967-09-12 | 1968-09-11 | Photographic element and process |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3560213A (en) |
| JP (1) | JPS4842966B1 (en) |
| BE (1) | BE720660A (en) |
| DE (1) | DE1797239C3 (en) |
| FR (1) | FR1579422A (en) |
| GB (1) | GB1200393A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3816135A (en) * | 1972-03-30 | 1974-06-11 | Du Pont | Direct positive silver halide emulsions through synergistic effects of fogging agents and organic reducing agents and/or their oxidized forms |
| GB1427525A (en) * | 1972-07-13 | 1976-03-10 | Agfa Gevaert | Directpositive silver halide emulsions |
-
1967
- 1967-09-12 US US667077A patent/US3560213A/en not_active Expired - Lifetime
-
1968
- 1968-09-03 DE DE1797239A patent/DE1797239C3/en not_active Expired
- 1968-09-11 GB GB43272/68A patent/GB1200393A/en not_active Expired
- 1968-09-11 BE BE720660D patent/BE720660A/xx unknown
- 1968-09-11 FR FR1579422D patent/FR1579422A/fr not_active Expired
- 1968-09-12 JP JP43065314A patent/JPS4842966B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR1579422A (en) | 1969-08-22 |
| JPS4842966B1 (en) | 1973-12-15 |
| US3560213A (en) | 1971-02-02 |
| BE720660A (en) | 1969-03-11 |
| DE1797239A1 (en) | 1970-12-17 |
| DE1797239C3 (en) | 1978-04-13 |
| DE1797239B2 (en) | 1977-08-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |