| 摘要 |
METHOD OF PRODUCING A POLYESTER FROM HIGH-PURITY BIS - (BETHA)-HYDROXYETHYL TEREPHTHALATE AS A RAW MATERIAL CONTAINING CATIONS AND ANIONS IN TRACE AMOUNTS. POLYESTER PRODUCTION RAW MATERIALS INCLUDING BIS -(BETHA)-HYDROXYETHYL TEREPHALATE CONTAINING CATIONS AND ANIONS IN A TOTAL WEIGHT OF NOT MORE THAN 50 PPM, ETHYLENE GLYCOL AND ANTIMONY TRIOXIDE AND/OR GERMANIUM DIOXIDE AS A POLYMERIZTION CATALYST ARE HEATED WITHOUT SUBSTANTIALLY DISTILLING OFF ETHYLENE GLYCOL AND THEN HEATED UNDER REDUCED PRESSURE TO BE POLYCONDENSED WHILE ETHYLENE GLYCOL IS DISTILLED OFF.
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