| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_9b0f615b92cd3bb66e8ea41483a2dc63 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C273-1854 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C273-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C269-06
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C263-04 |
| filingDate |
1992-10-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1993-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0d09f7302b36416fd9ebc09655ee865d
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8d4e0f2ddfe6beb3fc3d39a0e98f04bb
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_c1db91f09a75a156a27d3a0349de8210 |
| publicationDate |
1993-06-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-5220061-A |
| titleOfInvention |
Selective process for the preparation of diphenylmethane bis-(dialkyl ureas |
| abstract |
A selective process for the preparation of diphenylmethane bis(dialkylureas) is disclosed. An alkyl phenylcarbamate or an N,N-dialkyl-N'-phenylurea is reacted with a methylene bis(alkyl carbamate) in the presence of an acid catalyst. The use of a staged addition of phenylcarbamate or phenylurea to the methylene bis(carbamate) and the use of a ramped temperature program are the keys to good selectivity to MDI dimer products. |
| priorityDate |
1992-02-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |