| Predicate |
Object |
| assignee |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_c7ad58d3c0b071069a8ee0cb8c8ba2e8 |
| classificationCPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-64
http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-916 |
| classificationIPCInventive |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-00
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-91
http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-64 |
| filingDate |
1977-10-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| grantDate |
1980-03-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor |
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_7496fa84bfb312161a232dd8fe55893f
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_b43aac13c4bcbd50845fc109ef45ed5c
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8c58209c927a5bec56af3d790e72aedc
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_72e5a348094ca08c51b89160e399bc4f
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4bf0fc2b0e9d21bccdd858c7113edaa5
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bae45433bcfc64f7266119285c1e4ff7 |
| publicationDate |
1980-03-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber |
US-4191705-A |
| titleOfInvention |
Process for the preparation of carbonic acid esters of polyester-polyols |
| abstract |
The present invention relates to a process for the preparation of carbonic acid esters of polyester-polyols by transesterifying the polyols with carbonic acid aryl esters at elevated temperatures under vacuum in the presence of a catalyst. The reaction conditions are controlled to avoid the formation of by-products and the chain extension of the polyester-polyols. The present invention is also concerned with the polyester carbonic acid esters so formed, their use in producing polycarbonate block copolymers and the copolymers so produced. The copolymers may be produced by transesterifying the polyester carbonic acid esters with bisphenols and subjecting the bis-hydroxyaryl carbonates so formed to normal polycarbonate synthesis such as interfacial or melt polycondensation. |
| isCitedBy |
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4400491-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4948862-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4959499-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4689353-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5198530-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4297455-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4861909-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5084528-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4879357-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4333809-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4686273-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4686274-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4795810-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4816529-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4956424-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5194573-A |
| priorityDate |
1976-11-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type |
http://data.epo.org/linked-data/def/patent/Publication |