GB1336044A - Direct-positive silver halide photographic emulsion - Google Patents
Direct-positive silver halide photographic emulsionInfo
- Publication number
- GB1336044A GB1336044A GB1867071A GB1867071A GB1336044A GB 1336044 A GB1336044 A GB 1336044A GB 1867071 A GB1867071 A GB 1867071A GB 1867071 A GB1867071 A GB 1867071A GB 1336044 A GB1336044 A GB 1336044A
- Authority
- GB
- United Kingdom
- Prior art keywords
- substituted
- represent
- silver halide
- alkyl
- methine
- 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
- G03C1/48523—Direct positive emulsions prefogged characterised by the desensitiser
- G03C1/4853—Direct positive emulsions prefogged characterised by the desensitiser polymethine dyes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
1336044 Supersensitizing direct positive silver halide emulsions FUJI PHOTO FILM CO Ltd 2 June 1971 [2 June 1970] 18670/71 Heading G2C A direct positive fogged silver halide emulsion contains a supersensitizing combination of a cyanine dye of formula I: in which Z and Z<SP>1</SP> each represent the atoms necessary to complete a 5- or 6- membered heterocyclic nucleus, which may carry further substituents except at the N-position, R and R<SP>1</SP> each represent alkyl or aryl, which groups may be substituted, cycloalkyl or allyl, L<SP>1</SP>, L<SP>2</SP> and L<SP>3</SP> each represent methine or a substituted methine in which the substituents of two substituted methine groups may link to form a ring of the following formula:- in which R<SP>6</SP> is H or CH 3 and R<SP>7</SP> is H, alkyl, substituted alkyl, aralkyl, phenyl, substituted phenyl or furyl, p and q are each 1 or 2, n is 1, 2 or 3, m is 1 or 2, X is an anion but is absent when m is 1, the dye forming a betaine structure, together with a compound of formula II:- wherein each Y, which may be the same or different, is =CH- or =N-, R<SP>2</SP>, R<SP>3</SP>, R<SP>4</SP> and R<SP>5</SP> each represent H, OH, alkoxy, aryloxy, halogen, heterocyclic nucleus, alkylthis, arylthio, amino substituted or unsubstituted arylamino or alky lamino, heterocyclylamino, aryl or mercapto, and -A- is -A 1 - or -A 2 - where -A 1 - represents:- in which M is H or a cation giving water-solubility to the group, and -A 2 - is:- with the limitation that when -A- is -A 2 - at least one of R<SP>2</SP>, R<SP>3</SP>, R<SP>4</SP> and R<SP>5</SP> is a substituent having a -SO 3 M group wherein M is as defined above. The emulsion may also contain as a sensitizer the salt of a Group VIII metal e.g. an iridium or thodium salt.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4788070 | 1970-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1336044A true GB1336044A (en) | 1973-11-07 |
Family
ID=12787684
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1867071A Expired GB1336044A (en) | 1970-06-02 | 1971-06-02 | Direct-positive silver halide photographic emulsion |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1336044A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2140928A (en) * | 1983-04-15 | 1984-12-05 | Fuji Photo Film Co Ltd | Silver halide photographic materials |
-
1971
- 1971-06-02 GB GB1867071A patent/GB1336044A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2140928A (en) * | 1983-04-15 | 1984-12-05 | Fuji Photo Film Co Ltd | Silver halide photographic materials |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |