http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-H0489823-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_2f8cfa5aee4410611b5c562275c9f8e3 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G64-20 |
| filingDate | 1990-08-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_431f01deef98f33df84d982d2a75bc64 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_ecbd56f7d05e62ff1b24ec1ed4a7f054 |
| publicationDate | 1992-03-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-H0489823-A |
| titleOfInvention | Preparation of polycarbonate |
| abstract | PURPOSE: To prepare a transparent and colorless high-molecular polycarbonate contg. no chlorine ion without using phosgene, a toxic compd., by allowing a dihydroxyl compd. and a bisaryl carbonate to undergo melt polycondensation in the presence of a specific catalyst. n CONSTITUTION: A dihydroxyl compd. and a bisaryl carbonate (e.g. bisphenyl carbonate) are allowed to undergo melt polycondensation in the presence of a catalyst selected from salts of an electron-donating amine compd. (e.g. N,N- dimethyl-4-aminopyridine) with a dihydroxyl compd. [e.g. a compd. of formula I, II, III, or IV (wherein R 1 , R 2 , R 3 , and R 4 are each H, 1-8C alkyl, or phenyl; X is halogen; (n)is 0-4; and (m) is 1-4)] to give a transparent and colorless high- molecular polycarbonate contg. no chlorine ion without using phosgene, a toxic compd. n COPYRIGHT: (C)1992,JPO&Japio |
| priorityDate | 1990-08-02-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 24.