| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-7664
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F8-30
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C263-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C263-20 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-76
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C263-20
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C263-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G12-40
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C265-14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G12-08 |
| filingDate |
1998-11-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate |
1999-06-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
KR-19990045414-A |
| titleOfInvention |
Improved Polymer MDI Color |
| abstract |
Disclosed are methods of preparing polymethylene polyphenyl polyisocyanates. The process of the present invention comprises phosgenating a polyamine corresponding to a polymethylene polyphenyl polyisocyanate dissolved in an inert organic solvent, removing excess phosgene, stripping the solvent, hydrazine or An improvement is that at least 0.00015% by weight of hydrazine derivative is added to the polyamine at any time prior to the stripping step. |
| priorityDate |
1997-11-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |