Process for producing polyester ether copolymer

Details Process for producing polyester ether copolymer Process for producing polyester ether copolymer

1992-07-09

1994-07-19

Acquah, Samuel A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

528272, 528274, 528286, 528297, 528298, 528299, 528300, 528308, 5283086, 525437, 525439, 524710, 524713, C08F 2000

Patent

active

053310667

ABSTRACT:
The present invention provides a process for producing a polyester ether copolymer which comprises conducting polycondensation after or while melting and mixing a polyester, of 0.3 (dl/g) or more in intrinsic viscosity, and a polyether having hydroxy groups or their derivatives at its terminals and having a molecular weight of 200 or more. The present invention can dispense with the steps of esterification, transesterification, etc., because of the use of the preformed polyester. Moreover, it shortens the reaction time so that only a small quantity of polyester is produced as a by-product. In addition, since the thermal history of the polyesterh is so small, deterioration of the polymer during production is suppressed. Furthermore, this process enables continuous production of products with good quality, which serves to markedly improve productivity.

REFERENCES:
patent: 4840984 (1989-06-01), Somemiya et al.
patent: 4914152 (1990-04-01), Miyashita et al.
patent: 4968778 (1990-11-01), Still et al.

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