GB1405803A - Photographic direct-positive silver salt material - Google Patents
Photographic direct-positive silver salt materialInfo
- Publication number
- GB1405803A GB1405803A GB2377673A GB2377673A GB1405803A GB 1405803 A GB1405803 A GB 1405803A GB 2377673 A GB2377673 A GB 2377673A GB 2377673 A GB2377673 A GB 2377673A GB 1405803 A GB1405803 A GB 1405803A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver salt
- silver
- grains
- cores
- positive
- 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
- G03C1/48515—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)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
1405803 Photographic direct positive silver salt material AGFA-GEVAERT A G 18 May 1973 [20 May 1972] 23776/73 Heading G2C A photographic material comprises at least one fogged direct-positive silver salt emulsion layer having silver salt grains containing internal electron traps and which are heterodisperse and irregular and have a grain size distribution in which at least 10% of the number of the grains have a diameter which deviates by at least 40% from the average grain diameter. The heterodisperse and irregular salt grains may have cores containing electron traps and an outer shell of silver salt on the cores. The silver salt may be silver bromide which may contain up to 20 moles per cent silver iodide. The silver salt grains may be fogged with a reducing agent in the presence of a gold compound or a compound of another metal more electro-positive than silver. The emulsion layer may contain a sensitizing or desensitizing dye (see EX9). Electron traps may be produced by forming ripening nuclei e.g. by chemical sensitization with gold or iridium salts or sulphur compounds such as thiosulphate, or by treating the cores with aqueous solutions of polyvalent metal salts e.g. trivalent bismuth. The directpositive emulsions used in the above materials are easily produced and have a flat gradation as is required for continuous tone images.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2224837A DE2224837C3 (en) | 1972-05-20 | 1972-05-20 | Direct positive photographic recording material |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1405803A true GB1405803A (en) | 1975-09-10 |
Family
ID=5845525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2377673A Expired GB1405803A (en) | 1972-05-20 | 1973-05-18 | Photographic direct-positive silver salt material |
Country Status (9)
Country | Link |
---|---|
US (1) | US3870522A (en) |
JP (1) | JPS586935B2 (en) |
BE (1) | BE799396A (en) |
CA (1) | CA1007919A (en) |
CH (1) | CH582898A5 (en) |
DE (1) | DE2224837C3 (en) |
FR (1) | FR2185808A1 (en) |
GB (1) | GB1405803A (en) |
IT (1) | IT985094B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2263246A1 (en) * | 1972-12-23 | 1974-07-04 | Agfa Gevaert Ag | PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE PHOTOGRAPHIC IMAGES |
JPS56121030A (en) * | 1980-02-27 | 1981-09-22 | Mitsubishi Paper Mills Ltd | Direct positive silver halide photographic sensitive material |
US4370411A (en) * | 1980-09-11 | 1983-01-25 | E. I. Du Pont De Nemours And Company | Method for producing a long scale direct-positive photographic emulsion |
US4378427A (en) * | 1980-09-11 | 1983-03-29 | E. I. Du Pont De Nemours And Company | Method for producing a long scale direct-positive photographic emulsion |
JPS61264336A (en) * | 1985-05-20 | 1986-11-22 | Konishiroku Photo Ind Co Ltd | Direct positive type silver halide photographic sensitive material |
DE3717227A1 (en) * | 1987-05-21 | 1988-12-01 | Henkel Kgaa | PHOSPHATE-FREE DETERGENT WITH REDUCED INCRUSTING TENDENCY |
DE3812530A1 (en) * | 1988-04-15 | 1989-10-26 | Henkel Kgaa | PROCESS FOR INCREASING THE DENSITY OF SPREADY DRY, PHOSPHATE-REDUCED DETERGENT |
US6120984A (en) * | 1998-06-17 | 2000-09-19 | Eastman Kodak Company | Solid electrolyte particles comprising MAg4 I5 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE476292A (en) * | 1946-04-01 | |||
US2717833A (en) * | 1952-05-12 | 1955-09-13 | Sperry Rand Corp | Direct positive emulsions |
US3206313A (en) * | 1961-05-15 | 1965-09-14 | Eastman Kodak Co | Chemically sensitized emulsions having low surface sensitivity and high internal sensitivity |
BE636801A (en) * | 1962-09-01 | |||
US3367778A (en) * | 1965-04-15 | 1968-02-06 | Eastman Kodak Co | Silver salt direct positive emulsion |
US3445235A (en) * | 1965-07-15 | 1969-05-20 | Du Pont | Rhodium and iridium salts as anti-kinking agent in direct positive silver halide emulsions |
US3317322A (en) * | 1965-08-27 | 1967-05-02 | Eastman Kodak Co | Photographic emulsions having high internal sensitivity |
US3505070A (en) * | 1966-03-11 | 1970-04-07 | Eastman Kodak Co | Direct positive emulsion containing dimethine dyes containing a 2-aromatically substituted indole nucleus |
US3510348A (en) * | 1966-03-11 | 1970-05-05 | Eastman Kodak Co | Direct positive recording film |
US3501305A (en) * | 1966-03-11 | 1970-03-17 | Eastman Kodak Co | Monodispersed photographic reversal emulsions |
GB1201792A (en) * | 1967-04-22 | 1970-08-12 | Kodak Ltd | Direct-positive photographic silver halide materials |
DE1597488A1 (en) * | 1967-10-12 | 1970-06-11 | Agfa Gevaert Ag | Improved photographic emulsion for the production of direct positive images |
US3615573A (en) * | 1968-09-09 | 1971-10-26 | Mary D Illingsworth | Direct-positive composition containing individually and differently fogged silver halide emulsions |
US3600180A (en) * | 1968-11-04 | 1971-08-17 | Eastman Kodak Co | Method of making a blend of fogged,direct positive silver halide emulsions of different grain sizes |
GB1323111A (en) * | 1970-04-01 | 1973-07-11 | Agfa Gevaert | Photographic direct positive silver halide material |
-
1972
- 1972-05-20 DE DE2224837A patent/DE2224837C3/en not_active Expired
-
1973
- 1973-05-11 BE BE1005035A patent/BE799396A/en unknown
- 1973-05-16 US US360845A patent/US3870522A/en not_active Expired - Lifetime
- 1973-05-18 GB GB2377673A patent/GB1405803A/en not_active Expired
- 1973-05-18 IT IT50076/73A patent/IT985094B/en active
- 1973-05-18 FR FR7318148A patent/FR2185808A1/fr not_active Withdrawn
- 1973-05-18 CA CA171,847A patent/CA1007919A/en not_active Expired
- 1973-05-18 CH CH714973A patent/CH582898A5/xx not_active IP Right Cessation
- 1973-05-19 JP JP48055206A patent/JPS586935B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CA1007919A (en) | 1977-04-05 |
DE2224837B2 (en) | 1980-02-28 |
DE2224837C3 (en) | 1986-05-07 |
IT985094B (en) | 1974-11-30 |
CH582898A5 (en) | 1976-12-15 |
DE2224837A1 (en) | 1973-11-29 |
JPS4943627A (en) | 1974-04-24 |
US3870522A (en) | 1975-03-11 |
BE799396A (en) | 1973-11-12 |
JPS586935B2 (en) | 1983-02-07 |
FR2185808A1 (en) | 1974-01-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
433D | Application made for revocation (sect. 33/1949) | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
433C | Case decided by the comptroller ** specification amended (sect. 33/1949) | ||
SP | Amendment (slips) printed | ||
PCNP | Patent ceased through non-payment of renewal fee |