Process for producing polyester by ring-opening copolymerization

Details Process for producing polyester by ring-opening copolymerization Process for producing polyester by ring-opening copolymerization

1994-04-26

1995-02-21

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528272, 528276, 528279, 528281, 528282, 528287, 528288, 528293, 528392, 525437, C08G 6342

Patent

active

053917006

ABSTRACT:
This invention provides a process for producing with industrially good efficiency a polyester having a high melting point and biodegradability. In this process, ring-opening copolymerization of a cyclic acid anhydride containing succinic anhydride as a main component with a cyclic ether containing ethylene oxide as a main component is carried out in the presence of a catalyst by introducing successively the cyclic ether into a reaction vessel containing the cyclic acid anhydride in a melting state or solution state. The rate per hour of introducing the cyclic ether is within the range of 3 to 90 parts by weight per 100 parts by weight of the cyclic acid anhydride, and the reaction vessel has an inside pressure within the range of atmospheric pressure to 50 kgf/cm.sup.2 as a gauge pressure.

REFERENCES:
patent: 4954572 (1990-09-01), Emert et al.
patent: 5057617 (1991-10-01), Emert et al.
Polymer Preprints, Japan vol. 42, No. 2 (1993) p. 424 Published May 12, 1993.
Kobanshi Ronbunshu, Japan vol. 50, No. 10, pp. 723-729 Published Oct., 1993.

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