| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-02
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-7664
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C263-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C209-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-0655 |
| classificationIPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C211-50
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C265-12 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C211-43
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C209-78
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-76
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C263-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C265-14
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G12-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-02 |
| filingDate |
2003-06-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e11d68232fa50aa65756526b79771b3b
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a9ac1780ef104bce4d1be75c1d1a6c12
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_2a94a36e3a005ded08620bf6334f24bc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e9148f283f55da6551fe00e2fc121d4f |
| publicationDate |
2004-01-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
KR-20040002719-A |
| titleOfInvention |
Process for the preparation of polyisocyanates of the diphenylmethane group having a reduced color value |
| abstract |
The present inventionn n n a) reacting aniline and formaldehyde in the presence of an acid catalyst to produce a polyamine,n n n b) neutralizing the reaction mixture produced in a) with a base,n n n A process for the preparation of diphenylmethane-based polyamines, wherein at least one alcohol is present during and / or after the neutralization step. The molar ratio of alcohol to formaldehyde is at least 0.02: 1.n n n In addition, the present inventionn n n c) a process for the preparation of diphenylmethane-based polyisocyanates according to the process described above, further comprising the step of phosgenating the resulting polyamine with the corresponding diphenylmethane-based polyisocyanate. |
| priorityDate |
2002-06-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |