http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8093348-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_cb5b33dab22514f4b25e96afb76bd439 http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_230c5c9d495e3bf392ef2b8098e51921 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-1017 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07D307-89 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-10 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G69-26 |
| filingDate | 2007-08-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2012-01-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7c30ad81c030378eabf168a491a79c42 |
| publicationDate | 2012-01-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-8093348-B1 |
| titleOfInvention | Polyimides derived from novel asymmetric dianhydrides |
| abstract | This invention relates to the compositions and processes for preparing thermoset and thermoplastic polyimides derived from novel asymmetrical dianhydrides: specifically 2,3,3′,4′ benzophenone dianhydride (a-BTDA), and 3,4′-(hexafluoroisopropylidene)diphthalic anhydride (a-6FDA). The a-BTDA anhydride is prepared by Suzuki coupling with catalysts from a mixed anhydride of 3,4-dimethylbenzoic acid or 2,3-dimethylbenzoic acid with 2,3-dimethylphenylboronic acid or 3,4-dimethylphenylboronic acid respectively, to form 2,3,3′,4′-tetramethylbenzophenone which is oxidized to form 2,3,3′,4′-benzophenonetetracarboxylic acid followed by cyclodehydration to obtain a-BTDA. The a-6FDA is prepared by nucleophilic triflouoromethylation of 2,3,3′,4′-tetramethylbenzophenone with trifluoromethyltrimethylsilane to form 3,4′-(trifluoromethylmethanol)-bis(o-xylene) which is converted to 3,4′-(hexafluoroisopropylidene-bis(o-xylene). The 3,4′-(hexafluoroisopropylidene)-bis(o-xylene) is oxidized to the corresponding tetraacid followed by cyclodehydration to yield a-6FDA. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10059682-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/WO-2015048071-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9926408-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-8993710-B1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-10240000-B2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-105579492-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-105579492-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-110872438-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109134858-B http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CN-109134858-A |
| priorityDate | 2006-03-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
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