http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-6974855-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_230c5c9d495e3bf392ef2b8098e51921 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-121 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-12 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F2-46 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-12 |
| filingDate | 2003-07-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2005-12-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_291e1c1c4cf47d3c7e08d6ae9b902daf |
| publicationDate | 2005-12-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-6974855-B1 |
| titleOfInvention | Polyimides by photochemical cyclopolymerization |
| abstract | The novel polyimides of this invention are derived from Diels-Alder cyclopolymerization of photochemically generated bisdienes with dienophiles, such as bismaleimides, trismaleimides and mixtures thereof with maleimide end-caps. Irradiation of one or more diketones produces two distinct hydroxy o-quinodimethane (photoenol) intermediates. These intermediates are trapped via Diels-Alder cycloaddition with appropriate dienophiles, e.g., bismaleimide and/or trismaleimides to give the corresponding polyimides in quantitative yields. When bismaleimides, trismaleimides or mixtures thereof with maleimide end-caps are used as the dienophile, the resulting polyimides have glass transition temperatures (Tg) as high as 300° C. Polyimide films can be prepared by ultraviolet irradiation of high solids content varnishes of the monomers in a small amount of solvent, e.g., cyclohexanone, dimethyl formamide, N-methylpyrollidone and the like. These novel polyimides are characterized as having high glass transition temperatures, good mechanical properties and improved processing in the manufacture of adhesives, electronic materials and films. |
| priorityDate | 2001-04-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 181.