http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H0543537-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_0e7b522b71fd001f1a633fd8563b2a3e |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-52 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-10 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C269-06 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J27-02 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D265-16 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C271-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00 |
| filingDate | 1991-07-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8346520102991d7ea021940763ffffc6 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_6c4d04f63c596c155f9abbc4e0a35b0e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_9644e91f36eee47532e941da3c7fe321 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a38fa46d04327262c587328b61a1fcc5 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b73c4cc9cd920302c914ce9761d435f0 |
| publicationDate | 1993-02-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H0543537-A |
| titleOfInvention | Process for producing 4,4'-methylenediphenyl carbamate and polymethylene polyphenyl carbamate |
| abstract | (57) [Summary] (Modified) [Purpose] 4,4'-MDU, a raw material for pure MDI The present invention provides a method for producing PMPPU with high purity and high yield, and for producing highly pure PMPPU which is commercially satisfactory as a raw material for crude MDI. A method for producing 4,4'-methylenediphenylcarbamate and polymethylenepolyphenylcarbamate by reacting N-phenylcarbamate with a methyleneating agent in the presence of an acid catalyst, wherein (a) the methyleneating agent is N- A step of reacting at a specific molar ratio with respect to phenylcarbamate, (b) a step of separating and obtaining 4,4′-methylenediphenylcarbamate to be formed, (c) a reaction product after the separation of step (b), A process for producing 4,4'-methylenediphenylcarbamate, which comprises the step of continuing the reaction in the presence of sulfonic acid and / or a solid strong acid to produce polymethylene polyphenylcarbamate. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2014532731-A |
| priorityDate | 1990-07-20-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 75.