Late addition of supplemental ethylene glycol in the preparation

Details Late addition of supplemental ethylene glycol in the preparation Late addition of supplemental ethylene glycol in the preparation

1998-03-18

2000-08-15

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528308, 5283086, 526 65, 526 66, C08G 6300

Patent

active

061038598

ABSTRACT:
The invention is directed to a method for making copolyesters of terephthalic acid and a diol component including ethylene glycol and includes the steps of adding terephthalic acid and diol to a first esterification reactor and then late addition of supplemental ethylene glycol subsequent to the first esterification reactor but prior to a point where the ethylene glycol partial pressure is reduced below about 300 torr.

REFERENCES:
patent: 4020049 (1977-04-01), Rinehard
patent: 4077945 (1978-03-01), Heinze et al.
patent: 4230818 (1980-10-01), Broughton, Jr. et al.
patent: 5198530 (1993-03-01), Kyber et al.
patent: 5340907 (1994-08-01), Yau et al.
patent: 5385773 (1995-01-01), Yau et al.
patent: 5681918 (1997-10-01), Adams et al.
"Improved Color Poly(ethylene/1,4-Cyclohexylenedimethylene Terephthalate", Research Disclosure, Mar., 1994, pp. 142-144, No. 359, XP000440539.

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