| 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/C07C209-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C263-10 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C265-14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C211-50 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G12-40
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-76
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C209-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C263-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G12-08 |
| filingDate |
2002-08-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_222f6612ccbd343e17b87b3e09ad4027
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_fbeeed9ef0e3bbedb0d887527b5db02d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_195d7919118890bcf878b12034fc80d6
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_89938ac6bfabc342159023ff41c5ec3e |
| publicationDate |
2003-06-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-1288190-A3 |
| titleOfInvention |
Process for the preparation of polyisocyanates of the diphenylmethane series having reduced colour |
| abstract |
a) Anilin und Formaldehyd in Gegenwart eines sauren Katalysators zu Polyaminennumsetzt und danach b) das Reaktionsgemisch mit einer Base bei einer Temperatur von oberhalbn110°C neutralisiert oder das Reaktionsgemisch nach der Neutralisation mitneiner Base auf eine Temperatur von oberhalb 110°C aufheizt und danach c) die Polyamine durch Phosgenierung zu den entsprechenden Polyisocyanatennumsetzt. The invention relates to a process for the preparation of polyisocyanates of the diphenylmethane series, in which a) converting aniline and formaldehyde to polyamines in the presence of an acidic catalyst and then b) the reaction mixture is neutralized with a base at a temperature above 110 ° C. or the reaction mixture is heated after the neutralization with a base to a temperature above 110 ° C. and then c) the polyamines are converted into the corresponding polyisocyanates by phosgenation. |
| priorityDate |
2001-08-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |