http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DD-247444-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_99a3e6cf9ae2da50e548d7039dc30f86 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B63-02 |
| filingDate | 1986-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_63219938238419834811a71c56c2e99d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6fb64f852d8674c046807d53888929ff http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8b53662046f4b56f940b81c31ddfa4c6 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4bf469b9ffdf571d0d551db910f321c8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0fabf6d6623a7b40968657f076fda211 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c273a6348268c66dd5c64eb6fbde4ba4 |
| publicationDate | 1987-07-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DD-247444-A1 |
| titleOfInvention | PROCESS FOR CLEANING COLOR COUPLERS |
| abstract | The invention relates to a process for the purification of color couplers for silver halide-based photographic color materials. The object and the object of the invention are a process for the separation of the long-chain aliphatic by-products of non-diffusing dye couplers obtained as a crude product during the preparation. The color couplers are to be obtained with a high degree of purity and without loss of yield. According to the invention, the process is carried out in such a way that the color couplers to be purified or their intermediates, if they already contain long-chain aliphatic by-products, are dissolved in dichloromethane or a dichloromethane / alcohol mixture and mixed with an alcoholic, a water-alcoholic or an aqueous urea solution. The resulting solid, consisting of the urea inclusion compounds of the long chain aliphatic by-products and excess urea, is separated and the solution is recovered from the solution by removing the solvents. |
| priorityDate | 1986-04-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.