Method for producing polyesters containing low amounts of ether

Details Method for producing polyesters containing low amounts of ether Method for producing polyesters containing low amounts of ether

1979-06-22

1980-09-16

Phynes, Lucille M.

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

Synthetic resins

From carboxylic acid or derivative thereof

528274, 528279, 528280, 528281, 528283, 560 92, C08G 6316

Patent

active

042231248

ABSTRACT:
A method for decreasing the amount of ether as a by-product in polyesters (for example terephthalic-based) by initially utilizing a deficient amount of a glycol (for example, ethylene glycol) in the early reaction stages and utilizing an excess of the glycol in the final or end stages. The polyesters produced are of better quality, have a high melting point, possess increased thermal stability, and yield improved fiber properties.

REFERENCES:
patent: 3427287 (1969-02-01), Pengilly
patent: 4020049 (1977-04-01), Rinehart
patent: 4165420 (1979-08-01), Rinehart

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