http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5770352-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5d9f3ca41550d315642580237250c5b0 |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C7-3885 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C7-39288 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10S430-136 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/G03C7-388 |
| classificationIPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C7-392 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G03C7-388 |
| filingDate | 1996-04-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 1998-06-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_49ecfde60f5e8f659a073cead2ebc079 |
| publicationDate | 1998-06-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-5770352-A |
| titleOfInvention | High activity photographic dispersions with ultra low levels of permanent solvent |
| abstract | The invention is accomplished by providing an aqueous dispersion of a photographic coupler by precipitation from a solvent solution by solvent and/or pH shift. A second aqueous dispersion of an activating permanent solvent for the photographic coupler is also provided. The dispersion of activating permanent solvent and photographic coupler are combined to form a combined dispersion with relatively low amounts of coupler solvent which may be then mixed with a gelatin dispersion of silver halide particles to form a photographic emulsion coating composition suitable for casting as a photographic element layer. The coupler is selected to have a logP greater than or equal to about 10 and the activating solvent is selected to have a logP greater than or equal to about 8 and a Tg less than or equal to about -80 DEG C. to provide stable, small size photographically active coupler dispersions without the need for nonionic water soluble polymers and with minimal amount of added solvent. Use of a weight ratio of permanent solvent to coupler within the range of from 0.01:1 to 0.3:1 in accordance with the invention enables thin photographic layers to be coated with good photographic activity. |
| priorityDate | 1996-04-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 49.