http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2004043743-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e79b36d234409c330a83cf7956fb4e10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G12-40 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-76 |
| filingDate | 2002-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c9853433e0f7d841890a29d3e6d3a78e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_af1a4e6a95fafb248fcfd59f2e8c927d http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b18b1322fa2065af0fbf77e8252c33f7 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b2c8c0e2f8e038602bf1da17590c43e1 |
| publicationDate | 2004-02-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2004043743-A |
| titleOfInvention | Method for producing polymethylene polyphenyl polyisocyanate |
| abstract | An object of the present invention is to provide a method for producing polymethylene polyphenyl polyisocyanate which can easily and efficiently reduce the number of solution colors of crude MDI. A step of reacting aniline with formaldehyde in the presence of an acid catalyst to obtain polymethylene polyphenylpolyamine; a step of heating the polyamine obtained in this step in an inert solvent to react with phosgene; After the step, a concentration step of removing 90% by mass or more of excess phosgene and an inert solvent at 80 to 170 ° C. and 13.3 to 133.3 kPa, and a heat treatment of the reaction solution at 180 ° C. or more after this step are included. In the production method, after completion of the phosgenation and before the heat treatment, a modified urethane obtained by urethanizing at least one selected from diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate, and uretonimine modified diphenylmethane diisocyanate is injected at less than 180 ° C. I do. [Selection diagram] None |
| priorityDate | 2002-07-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.