GB714561A - Improvements in sensitized photographic emulsions - Google Patents
Improvements in sensitized photographic emulsionsInfo
- Publication number
- GB714561A GB714561A GB28894/52A GB2889452A GB714561A GB 714561 A GB714561 A GB 714561A GB 28894/52 A GB28894/52 A GB 28894/52A GB 2889452 A GB2889452 A GB 2889452A GB 714561 A GB714561 A GB 714561A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- formula
- emulsions
- dye
- phenyl
- 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
- G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
- G03C1/08—Sensitivity-increasing substances
- G03C1/28—Sensitivity-increasing substances together with supersensitising substances
- G03C1/29—Sensitivity-increasing substances together with supersensitising substances the supersensitising mixture being solely composed of dyes ; Combination of dyes, even if the supersensitising effect is not explicitly disclosed
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- General Physics & Mathematics (AREA)
- Paper (AREA)
Abstract
714,561. Supersensitized photographic emulsions. KODAK, Ltd. Nov. 17,1952 [Nov. 17, 1951], No. 28894/52. Class 98(2) Photographic silver halide emulsions are supersensitized with a combination of (a) a hemicarbocyanine base having the formula wherein R 2 represents an alkyl group, R 3 represents an aryl group, L represents a methine group (any of which may be substituted or unsubstituted) and Z 2 completes a nucleus of the beta-naphthathiazole series, and (b) a 2:2'-carbocyanine dye or a 9-alkylthia 2-carbocyanine dye or a meso substituted carbocyanine dye which latter has the formula wherein R and R 1 represent alkyl groups, D represents an alkyl or aryl group (any of which may be substituted or unsubstituted), Z and Z, each completes a nucleus of the benzthiazole, benzselenazole or beta-naphthathiazole series and X represents an anion. In the above formulae. R, R 1 , R 2 and D may each be an alkyl group of the formula wherein n is an integer from 1 to 4 and D may also be phenyl, o- or p-chlorophenyl or o-, m- or p-tolyl. L may have the formula =CR 4 wherein R 4 is methyl or ethyl, R 3 may be phenyl, o- or pchlorophenyl or an alkoxy-phenyl group and X may be bromide, iodide, chloride, methyl sulphate, ethyl sulphate, benzene sulphonate, p-toluenesulphonate, perchlorate or thiocyanate. Many examples of both dyes and bases, and of suitable combinations, are given, but only those combinations which produce a supersensitizing effect as determined by the tests given in Specifications 498,031, 498,289, 498,290 and 498,291 are of use in the invention. Both dye and base may be used in concentrations of 0.05 to 0,25g per mole of silver halide in the emulsion and the ratio of dye to base may vary from 5:1 to 1:5 by weight. The emulsions may be coated onto a support of glass, cellulose nitrate, cellulose acetate, polyvinyl acetal resin, paper or metal. The invention is particularly useful for gelatino-silver-halide developing-out emulsions. Specifications 344,409, 394,692, [both in Group IV]; 525,365, 533,425, 561,172, 585,666, [Group IV], 599,636, 635,841 and 676,164 also are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US714561XA | 1951-11-17 | 1951-11-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB714561A true GB714561A (en) | 1954-09-01 |
Family
ID=22101438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28894/52A Expired GB714561A (en) | 1951-11-17 | 1952-11-17 | Improvements in sensitized photographic emulsions |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE515517A (en) |
FR (1) | FR1078985A (en) |
GB (1) | GB714561A (en) |
-
0
- BE BE515517D patent/BE515517A/xx unknown
-
1952
- 1952-11-17 GB GB28894/52A patent/GB714561A/en not_active Expired
- 1952-11-17 FR FR1078985D patent/FR1078985A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1078985A (en) | 1954-11-24 |
BE515517A (en) |
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