http://rdf.ncbi.nlm.nih.gov/pubchem/patent/DE-19544801-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G64-307 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-30 |
| filingDate | 1995-12-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_73af7a7fec1381b9c552b87dcfbaa7c8 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_3ccf4d3abdeeee2e68f984e79f2c6a73 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b88646dfd1da0f5d5b46da505e405652 |
| publicationDate | 1996-06-13-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | DE-19544801-A1 |
| titleOfInvention | Two-step process for the production of thermoplastic polycarbonate |
| abstract | Prodn. of polycarbonate (I) with little branching by ester exchange in the melt is carried out in two separate stages.Stage (1) comprises producing a catalyst-free oligocarbonate (II) by (1a) melting the reactants over up to 5 hr. at 80-180 deg C and atmos. pressure; (1b) adding 10<-4> to 10<-8> mole volatile N and/or phosphonium catalyst per mole diphenol; (1c) applying a vacuum (from atmos. pressure to 1 mbar) and heating (to up to 290 deg C) to remove monophenols by distn.; and (1d) isolating (II).Stage (2) comprises polycondensation to (1) at 240-320 deg C and pressure of under 500 mbar to 0.01 mbar in short times (less than 3 hr.) with addn. of 10<-4> to 10<-8> mole alkali(ne earth) metal salts per mole diphenol. |
| priorityDate | 1994-12-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 71.