http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-768622-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/G03C1-043 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C1-34 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-043 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C1-34 |
| filingDate | 1955-04-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-02-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-768622-A |
| titleOfInvention | Improvements in the preparation of photographic emulsions |
| abstract | 768,622. Photographic emulsions. KODAK, Ltd. April 22, 1955 [April 29, 1954], No. 11642/55. Addition to 742,222. Class 98(2) A light-sensitive silver halide emulsion has its light-sensitivity increased by the incorporation therein of an alkylene oxide polymer, preferably having a molecular weight of at least 300 e.g. from 1500 to 4000 or more, consisting of a condensation product of ethylene oxide with lauric acid, phenol, glycine or lauric acid amide and is stabilized with a mercury salt or compound which is (a) a simple mercury salt of an inorganic, or organic acid, (b) a molecular compound of a mercury salt with an organic compound containing a basic nitrogen atom, or (c) an organic compound of mercury in which the mercury atom is attached by a non-ionic bond to an organic nucleus and by an ionic bond to an anion. Compounds specified are bis - (2 - amino - 5 - iodopyridine hydriodide) mercuric iodide, pyridine hydriodide mercuric iodide, 4-mitradimethylaniline mercuric iodide and cystein hydrochloride mercuric chloride, The emulsion may be digested with naturally active gelatin or sulphur compounds or be treated with salts of ruthenium; rhodium, palladium, iridium, platinum or gold or with reducing agents. From 0..05 to 1.0 mg. of the mercury compound per gram mole of silver halide in the emulsion may be used. In examples, speed, gamma and fog data are given for portions of a gelatino silver bromiodide emulsion digested with a sulphur-compound as disclosed in Specification 235,211 [Class 98(2)] and potassium chloraurate and optically sensitized with 3 : 3<SP>1</SP> - diethyl - 9 - methylthiacarbocyanine bromide and containing (1) no further addition, polyethylene oxide lauric ester. and polyethylene oxide lauric ester and bis - (2 - amino - 5 - iodopyridine hydriodide) mercuric iodide; (2) no further addition, polyethylene oxide glycine, and polyethylene oxide glycine and bisbis - (2 - amino - 5 - iodopyridine hydriodide) mercuric iodide; (3) no further addition, polyethylene oxide glycine and bis- 2 - amino - 5 - iodopyridine hydriodide) mercuric iodide, and (4) no further addition, polyethylene oxide, lauric acid amide, and polyethylene oxide lauric acid amide and bis - (2 - amino - 5 - iodopyridine hy-. driodide) mercuric iodide. Specifications 742.219, 742,221, 742,224 and 755,369 also are referred to. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-2120800-A |
| priorityDate | 1952-11-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 62.