http://rdf.ncbi.nlm.nih.gov/pubchem/patent/KR-19980024491-A
Outgoing Links
| Predicate | Object |
|---|---|
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-183 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-785 http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08G63-78 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-183 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-181 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08L23-08 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-80 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08G63-78 |
| filingDate | 1997-09-10-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1998-07-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | KR-19980024491-A |
| titleOfInvention | Process for producing polyethylene terephthalate |
| abstract | The present invention relates to a polyethylene terephthalate production method comprising a liquid phase polycondensation reaction step, a precrystallization step, and a solid phase polycondensation step, wherein the precrystallization step is at least T g and not more than 180 ° C. while stirring the polyethylene terephthalate chip (A). A precrystallization step of heating at a temperature (T 1 ) to crystallize so that the crystallinity of the polyethylene terephthalate is at least 3%; (B) heating the polyethylene terephthalate at a temperature (T 2 ) of not less than (T bm -40 ° C) but not more than T bm to crystallize the polyethylene terephthalate to at least 30% (where T bm is The endothermic onset temperature of the bulk in the endothermic peak observed with a differential scanning calorimeter (DSC) when the polyethylene terephthalate is heated at a rate of 10 ° C / min); And (C) heating the polyethylene terephthalate chip with stirring to raise the temperature to the solid state polycondensation temperature. Even in the case of copolymerized polyethylene terephthalate, precrystallization of polyethylene terephthalate can be efficiently achieved. |
| priorityDate | 1996-09-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 114.