| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D209-48
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-89 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D209-48
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-89 |
| filingDate |
1995-05-11-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_52dcf89a4155d4570e4668bb8580499a
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_268bf82c1cc0186d9f279b7ab5d664e0
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f458b5f6d5c59169799f9725461f7a25
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_1d8bf31867cf415a71083b8f70ce06bd
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_0733938a0f83991941aa68d188e6cccc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_25cabb213116b5b2221a0d564009c3ec
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_a720032585b831ccdaca369ac12cda22
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_75fe9a0c6f0a5b8468067e3c20ddfe37
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f96833ee4bb85f0cc82a273faaa842c9 |
| publicationDate |
1995-11-29-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0684232-A1 |
| titleOfInvention |
Process for preparing bis(ether anhydrides) |
| abstract |
A process for making bis(ether anhydrides) employs alkylamines having low melting temperatures thus allowing for novel intermediate process steps for preparing bis(ether anhydrides). The alkylamines have alkyl groups which contain at least three carbon atoms and have boiling temperatures in the range of 48 to 250°C at atmospheric pressure. As a result of using these amines, liquid alkylamines now can be employed in the imidization process step. The N-alkyl nitrophthalimides prepared from the recovered imidization product according to this invention can now be purified using liquid/liquid extraction or vacuum distillation. The alkyl nitrophthalimides prepared according to this invention provide for displacement reactions which now can be run at a high solids level. Likewise, the exchange reaction can be run at a higher solids level, and thus achieves an efficiency level which is higher than conventional processes. |
| priorityDate |
1994-05-27-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |