http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-974303-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9799ffcda2dbb45041a5ab0fd08dd5fe |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-34 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-34 |
| filingDate | 1961-01-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1964-11-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-974303-A |
| titleOfInvention | Improvements in or relating to photographic silver halide emulsions |
| abstract | 974, 303. Stabilizing photographic silver halide emulsions. KODAK Ltd. Jan. 20, 1961 [Jan. 25, 1960], No. 2365/61. Heading G2C. A light sensitive silver halide emulsion which is chemically sensitized with a labile sulphur compound, a gold sensitizer, and a reduction sensitizer is stabilized by incorporating in the emulsion before, during or after the chemical sensitization, preferablye before the reduction sensitization, an aryl aldehyde having a substituent in the 3- and/or 4- position with respect to the position of the aldehyde group, or mucochloric or mucobromic acid or a water-soluble salt thereof. Suitable substituents in the aryl aldehyde compound are hydroxyl, halogen, alkyl or alkoxyl. Examples of suitable compounds are p-hydroxybenzaldehyde, m-hydroxybenzaldehyde and vanillin. Examples of water-soluble salts of mucochloric and mucobromic acid are the sodium, potassium,pyridinium,triethanolammonium and morpholinium salts thereof. Reduction sensitizer, which are defined as compounds having a sufficiently strong reduction action to reduce silver halide to metallic silver or to nucleate silver halide, preferably comprise stannous chloride, spermine, sodium formaldehyde sulphoxylate or a compound according to any of the following general formulae:- where R, R1 and R2 each represents a hydrogen atom, an alkyl group or an aryl group and M represents a water-solubilizing cation such as hydrogen, sodium, potassium, ammonium and triethanolammonium. where R3 represents an alkylene group containing from 2 to 4 carbon atoms and n represents a positive integer from 1 to 5. Also suitable are their water-soluble salts of non-desensitizing acids. III (R4)d SiH4-d or their hydrolysis products:- IIIa (R4)d SiOH4-d where R4 represents a hydrogen atom, a halogen atom, an alkyl group containing from 1 to 30 carbon atoms, an aryl group containing from 6 to 10 carbon atoms, an aryloxy group containing from 6 to 10 carbon atoms, a siloxy group or combinations thereof and d represents a positive integer from 1 to 3. The sulphur and gold sensitizers are defined and exemplified in the Specification. Specifications 649,545, 753,489, 789,823 and U.S.A. Specification 2,694,637 are referred to. |
| priorityDate | 1960-01-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 48.