GB1402198A - Photographic silver salt emulsion for the production of direct positive images - Google Patents
Photographic silver salt emulsion for the production of direct positive imagesInfo
- Publication number
- GB1402198A GB1402198A GB1453873A GB1453873A GB1402198A GB 1402198 A GB1402198 A GB 1402198A GB 1453873 A GB1453873 A GB 1453873A GB 1453873 A GB1453873 A GB 1453873A GB 1402198 A GB1402198 A GB 1402198A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver salt
- silver
- emulsion
- grains
- protective layer
- 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
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 title abstract 9
- 239000000839 emulsion Substances 0.000 title abstract 6
- 239000011241 protective layer Substances 0.000 abstract 5
- 239000010410 layer Substances 0.000 abstract 3
- 229910052709 silver Inorganic materials 0.000 abstract 2
- 239000004332 silver Substances 0.000 abstract 2
- 239000002904 solvent Substances 0.000 abstract 2
- JKFYKCYQEWQPTM-UHFFFAOYSA-N 2-azaniumyl-2-(4-fluorophenyl)acetate Chemical compound OC(=O)C(N)C1=CC=C(F)C=C1 JKFYKCYQEWQPTM-UHFFFAOYSA-N 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- 229910021612 Silver iodide Inorganic materials 0.000 abstract 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 abstract 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 abstract 1
- 239000003638 chemical reducing agent Substances 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 150000002344 gold compounds Chemical class 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 abstract 1
- -1 silver halide Chemical class 0.000 abstract 1
- 229940045105 silver iodide Drugs 0.000 abstract 1
- 150000003567 thiocyanates Chemical class 0.000 abstract 1
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 abstract 1
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
- G03C1/48515—Direct positive emulsions prefogged
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
1402198 Photographic direct-positive silver salt emulsion AGFA-GEVAERT AG 27 March 1973 [1 April 1972] 14538/73 Heading G2C A direct-positive photographic silver salt emulsion comprises grains of a silver salt which have been superficially fogged to produce fog which can be developed without exposure and then covered with a protective silver salt layer so that the fog nuclei are no longer at the surface of the grains. The protective layer may be 5 to 100 lattice planes thick. The silver salt of the grains may be the same as or different from the silver salt of the protective layer. The silver salt may be silver bromide which may contain up to 10 moles per cent of silver iodide. The grains may have been chemically fogged with a reducing agent in the presence of a gold compound or a compound of another metal which is more electro-positive than silver, before the protective layer is applied. The emulsion may be coated as a layer and be imagewise exposed so that the developable fog in the grains is imagewise destroyed and developed in a photographic developer containing a solvent for the silver salt of the protective layer. The solvent may be sulphites, thiocyanates, thiosulphates or triethanolamine. The emulsion may have at least three layers, namely the core which is chemically ripened on the surface, the shell which has a developable fog on the surface, and the outer protective layer which envelopes and protects the fogged silver halide shell. The emulsion has excellent stability regarding its sensitivity and maximum density.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2216075A DE2216075A1 (en) | 1972-04-01 | 1972-04-01 | PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE PHOTOGRAPHIC IMAGES |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1402198A true GB1402198A (en) | 1975-08-06 |
Family
ID=5840903
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1453873A Expired GB1402198A (en) | 1972-04-01 | 1973-03-27 | Photographic silver salt emulsion for the production of direct positive images |
Country Status (8)
Country | Link |
---|---|
US (1) | US3859093A (en) |
JP (1) | JPS4910725A (en) |
BE (1) | BE797198A (en) |
CA (1) | CA1022377A (en) |
DE (1) | DE2216075A1 (en) |
FR (1) | FR2178982A1 (en) |
GB (1) | GB1402198A (en) |
IT (1) | IT982932B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE32097E (en) * | 1981-11-12 | 1986-03-25 | Eastman Kodak Company | Blended grain direct-positive emulsions and photographic elements and processes for their use |
US4444865A (en) * | 1981-11-12 | 1984-04-24 | Eastman Kodak Company | Blended grain direct-positive emulsions and photographic elements and processes for their use |
USRE32149E (en) * | 1982-09-15 | 1986-05-20 | Eastman Kodak Company | Photographic elements containing direct-positive emulsions and processes for their use |
US4444874A (en) * | 1982-09-15 | 1984-04-24 | Eastman Kodak Company | Photographic elements containing direct-positive emulsions and processes for their use |
JPS59133542A (en) * | 1983-01-21 | 1984-07-31 | Fuji Photo Film Co Ltd | Method for developing silver halide photosensitive material |
JPS6067935A (en) * | 1983-09-22 | 1985-04-18 | Konishiroku Photo Ind Co Ltd | Silver halide photosensitive material |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3367778A (en) * | 1965-04-15 | 1968-02-06 | Eastman Kodak Co | Silver salt direct positive emulsion |
US3512985A (en) * | 1965-11-08 | 1970-05-19 | Eastman Kodak Co | Direct positive photographic silver halide emulsions and elements containing water insoluble polymers |
-
1972
- 1972-04-01 DE DE2216075A patent/DE2216075A1/en not_active Withdrawn
-
1973
- 1973-03-23 BE BE1004921A patent/BE797198A/en unknown
- 1973-03-26 US US344535A patent/US3859093A/en not_active Expired - Lifetime
- 1973-03-27 GB GB1453873A patent/GB1402198A/en not_active Expired
- 1973-03-30 CA CA167,583A patent/CA1022377A/en not_active Expired
- 1973-03-30 IT IT49154/73A patent/IT982932B/en active
- 1973-03-30 FR FR7311689A patent/FR2178982A1/fr not_active Withdrawn
- 1973-03-31 JP JP48036260A patent/JPS4910725A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS4910725A (en) | 1974-01-30 |
IT982932B (en) | 1974-10-21 |
DE2216075A1 (en) | 1973-10-11 |
US3859093A (en) | 1975-01-07 |
CA1022377A (en) | 1977-12-13 |
BE797198A (en) | 1973-09-24 |
FR2178982A1 (en) | 1973-11-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
48S | Specification amended (sect. 8/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |