GB1269260A - Direct-positive silver halide emulsion compositions - Google Patents
Direct-positive silver halide emulsion compositionsInfo
- Publication number
- GB1269260A GB1269260A GB42919/69A GB4291969A GB1269260A GB 1269260 A GB1269260 A GB 1269260A GB 42919/69 A GB42919/69 A GB 42919/69A GB 4291969 A GB4291969 A GB 4291969A GB 1269260 A GB1269260 A GB 1269260A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver halide
- direct
- halide grains
- portions
- emulsion compositions
- 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
- 239000000203 mixture Substances 0.000 title abstract 7
- 229910052709 silver Inorganic materials 0.000 title abstract 7
- 239000004332 silver Substances 0.000 title abstract 7
- -1 silver halide Chemical class 0.000 title abstract 7
- 239000000839 emulsion Substances 0.000 title abstract 6
- 239000000975 dye Substances 0.000 abstract 1
- 230000035945 sensitivity Effects 0.000 abstract 1
- 230000001235 sensitizing effect Effects 0.000 abstract 1
- 238000001228 spectrum Methods 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
-
- 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
- Y10S430/141—Direct positive material
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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1,269,260. Direct-positive silver halide emulsion compositions. EASTMAN KODAK CO. Aug.28, 1969 [Sept. 9, 1968], No.42919/69. Heading G2C. A direct-positive photographic silver halide emulsion composition comprises a mixture of at least two portions of silver halide grains which have been fogged to different fog levels. The mixture preferably comprises two to four portions of silver halide grains which have been chemically fogged to different fog levels whereby the characteristic curve of the emulsion composition has discrete steps. When a plurality of portions of silver halide grains is used the characteristic curve may be a smooth continuous curve. The emulsion compositions are preferably bluesensitive (i.e. they will form direct-positive images on exposure to light in the 350-500 nm region of the spectrum followed by processing), but the sensitivity may be extended into the green and red regions by using sensitizing dyes. All the silver halide grains preferably have substantially the same diameter and preferably have an average diameter of less than 2 microns. These emulsions have extended exposure latitude.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US75981668A | 1968-09-09 | 1968-09-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1269260A true GB1269260A (en) | 1972-04-06 |
Family
ID=25057061
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB42919/69A Expired GB1269260A (en) | 1968-09-09 | 1969-08-28 | Direct-positive silver halide emulsion compositions |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3615573A (en) |
| JP (1) | JPS5347003B1 (en) |
| BE (1) | BE738576A (en) |
| CH (1) | CH520349A (en) |
| DE (1) | DE1945449B2 (en) |
| FR (1) | FR2017656A1 (en) |
| GB (1) | GB1269260A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2224837C3 (en) * | 1972-05-20 | 1986-05-07 | Agfa-Gevaert Ag, 5090 Leverkusen | Direct positive photographic recording material |
| GB1456243A (en) * | 1973-01-25 | 1976-11-24 | Agfa Gevaert | Directpositive silver halide elements |
| GB1468816A (en) * | 1973-06-08 | 1977-03-30 | Agfa Gevaert | Photographic direct positive silver halide compositions |
| GB1447502A (en) * | 1973-06-18 | 1976-08-25 | Agfa Gevaert | Method of preparing direct-positive silver halide elements |
| 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 |
| 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 |
| DE3138166A1 (en) * | 1981-09-25 | 1983-04-14 | Irbit Holding AG, 1701 Fribourg | Foam cutting process |
| US4444865A (en) * | 1981-11-12 | 1984-04-24 | Eastman Kodak Company | Blended grain direct-positive emulsions and photographic elements and processes for their use |
| USRE32097E (en) * | 1981-11-12 | 1986-03-25 | 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 |
| EP0681209A1 (en) * | 1994-05-06 | 1995-11-08 | Agfa-Gevaert N.V. | Multilayer direct-positive photographic material and process for preparing the same |
-
1968
- 1968-09-09 US US759816A patent/US3615573A/en not_active Expired - Lifetime
-
1969
- 1969-08-28 GB GB42919/69A patent/GB1269260A/en not_active Expired
- 1969-09-08 JP JP7063369A patent/JPS5347003B1/ja active Pending
- 1969-09-08 BE BE738576D patent/BE738576A/xx unknown
- 1969-09-08 DE DE1945449A patent/DE1945449B2/en not_active Withdrawn
- 1969-09-09 FR FR6930560A patent/FR2017656A1/fr not_active Withdrawn
- 1969-09-09 CH CH1365969A patent/CH520349A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE1945449A1 (en) | 1970-03-19 |
| JPS5347003B1 (en) | 1978-12-18 |
| CH520349A (en) | 1972-03-15 |
| BE738576A (en) | 1970-02-16 |
| DE1945449B2 (en) | 1975-07-17 |
| FR2017656A1 (en) | 1970-05-22 |
| US3615573A (en) | 1971-10-26 |
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