| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c72d118f5664072de841f9c5c34b9d99 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C51-567
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-1021
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-1003 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C51-567
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07D307-89
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07B61-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-10 |
| filingDate |
1986-01-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_54b8c15ac890ca92574a76b6a1c9acd2 |
| publicationDate |
1986-10-15-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
EP-0197237-A2 |
| titleOfInvention |
Process for preparing aromatic polycarboxylic acids and their anhydrides from polycarboximides |
| abstract |
Aromatic polycarboxylic acids and their anhydrides such as bisphenol A dianhydride are prepared from the corresponding polycarboximides, such as bisphenol A bisimide, by an exchange reaction with phthalic acid or phthalic anhydride and water in the presence of dimethyl-n-butylamine as an exchange catalyst. The use of this amine results in the formation of a product of decreased color, as compared with the use of triethylamine. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0477539-A1 |
| priorityDate |
1985-01-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |