| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3492a7406879265b1f567f37d98dbbaf |
| classificationCPCAdditional |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y10T428-294 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G18-346
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-1035
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G73-1007 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09D175-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-34
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09D5-18
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G73-10
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G18-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09D179-08
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C09D179-04 |
| filingDate |
1973-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1974-12-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3c95aa8881d3ffa3e5099a11c759a32a
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ffe73c12b8b69b349ad54f4574efb048 |
| publicationDate |
1974-12-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-3853813-A |
| titleOfInvention |
Polyimide precursor and method and composition for preparing it |
| abstract |
A composition is disclosed of a dianhydride and a tetracarboxylic acid in the proportions of about 50 to about 70 mole % dianhydride to about 30 to about 50 mole % tetracarboxylic acid, a stoichiometric amount of an aromatic diisocyanate, and a solvent for the dianhydride, the tetracarboxylic acid, and the diisocyanate. A polyimide precursor is prepared by heating the composition at about 30* to 70*C until the evolution of carbon dioxide substantially ceases, and then at about 30* to about 100*C until its viscosity is about Q to about Z6 on the GardnerHoldt viscosity scale at 18% solids. The polyimide precursor can be spread on a substrate and cured to produce a polyimide film or coated on a wire and cured to produce a polyimide wire enamel. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4061623-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4094866-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4094864-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4076694-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4001186-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4160753-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5470936-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4427822-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4021412-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4092442-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4061622-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-3952084-A |
| priorityDate |
1973-05-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |