Title:
PROCEDURE FOR THE MANUFACTURE OF POLY-(ETHYLENE TEREPHTHALATE)
Document Type and Number:
WIPO Patent Application WO2002018472
Kind Code:
A3
Abstract:
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.
Inventors:
WIEGNER JENS-PETER (DE)
VOERCKEL VOLKMAR (DE)
MUNJAL SARAT (US)
VOERCKEL VOLKMAR (DE)
MUNJAL SARAT (US)
Application Number:
PCT/US2001/026579
Publication Date:
June 06, 2002
Filing Date:
August 24, 2001
Export Citation:
Assignee:
DOW CHEMICAL CO (US)
WIEGNER JENS PETER (DE)
VOERCKEL VOLKMAR (DE)
MUNJAL SARAT (US)
WIEGNER JENS PETER (DE)
VOERCKEL VOLKMAR (DE)
MUNJAL SARAT (US)
International Classes:
C08G63/78; C08G63/80; C08G63/91; (IPC1-7): C08G63/78; C08G63/183; C08G63/80; C08G63/91
Foreign References:
| US4132707A | 1979-01-02 | |||
| US3453240A | 1969-07-01 | |||
| US4161579A | 1979-07-17 | |||
| US4374975A | 1983-02-22 |
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