http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-9090744-B2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_3f1130e23cff1328c0ae14101d12103f |
| classificationCPCAdditional | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/Y02P20-54 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G75-23 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G75-20 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G75-20 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G75-23 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G8-02 |
| filingDate | 2012-09-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate | 2015-07-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_edb390bd09bac0aee35ab73c7702de4e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_491a7b16a0f8fe5f5cb7671a8a1719ce |
| publicationDate | 2015-07-28-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | US-9090744-B2 |
| titleOfInvention | Process for preparing polysulfone |
| abstract | The present invention relates to a process for preparing polysulfone, comprising reacting bisphenol monomers with a salt forming agent to form bisphenolate, followed by subjecting the bisphenolate and 4,4′-dihalodiphenyl sulfone to polycondensation to give polysulfone, characterized in that the reaction for forming bisphenolate and the polycondensation are performed in the presence of a composite ionic liquid as the solvent, the composite ionic liquid containing zwitterionic liquid of formula (I) and/or (II) as component A and ionic liquid of formula (III) and/or (IV) as component B, wherein variables are respectively defined in the description of the present invention. The process of the present invention enables a shortened preparation period of polysulfone, particularly a shortened reaction time (including the time of water removal) of the salt forming stage; in addition, the polysulfone thus prepared has an improved molecular weight which is much higher. |
| priorityDate | 2011-09-23-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 128.