发明名称 |
PROCEDURE FOR THE MANUFACTURE OF POLY-(ETHYLENE TEREPHTHALATE) |
摘要 |
The invention concerns a new procedure for the manufacture of poly-(ethylene terephthalate) (PET) by raising the molecular in the liquid phase to 68,000 to 86,000 g/mol, during the step of liquid phase polycondensation and subsequently pelletizing the amorphous product, followed by a crystallization over a period of 15-60 min, at temperatures of 160-185 DEG C, in air, whereby the pellet temperature reach 25-180 DEG C. In a subsequent procedural step the pellets remain for 2-10 h at temperatures of 120 DEG C to 220 DEG C ("preheater") in an air stream, followed by treating the polyester resin thus obtained with polyols or other blocking agents at concentrations of 100 and 10,000 ppm, relative to the polyester resin. |
申请公布号 |
WO0218472(A2) |
申请公布日期 |
2002.03.07 |
申请号 |
WO2001US26579 |
申请日期 |
2001.08.24 |
申请人 |
THE DOW CHEMICAL COMPANY;WIEGNER, JENS-PETER;VOERCKEL, VOLKMAR;MUNJAL, SARAT |
发明人 |
WIEGNER, JENS-PETER;VOERCKEL, VOLKMAR;MUNJAL, SARAT |
分类号 |
C08G63/78;C08G63/80;C08G63/91 |
主分类号 |
C08G63/78 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|