Preparation process of aliphatic polyester

Details Preparation process of aliphatic polyester Preparation process of aliphatic polyester

1997-08-26

1999-06-29

Acquah, Samuel A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528274, 528275, 528302, 528361, 528487, 528488, 525437, 525444, 524700, 524742, 524755, 210660, 210661, 210670, C08F 600, B01J 4900

Patent

active

059170107

ABSTRACT:
The invention relates to a preparation process of aliphatic polyester, comprising using an ion exchange resin as a drying agent and after the dehydration polycondensation reaction, regenerating and drying the used ion exchange resin and repeatedly using said ion exchange resin in the next dehydration polycondensation reaction, in a process for preparing aliphatic polyester from one or more aliphatic compound (A) by heating in an organic solvent in the presence of a catalyst, distilling a generated water containing organic solvent out of the reaction system, treating the distilled organic solvent with a drying agent, and returning the treated solvent to the reaction system to progress a dehydration polycondensation reaction. The process of the invention enables one to steadily and efficiently prepare in industry an aliphatic polyester having an excellent color tone, high molecular weight and high quality.

REFERENCES:
patent: 5310865 (1994-05-01), Enomoto et al.
patent: 5401796 (1995-03-01), Kashima et al.
patent: 5428126 (1995-06-01), Kashima et al.
patent: 5637631 (1997-06-01), Kitada et al.
patent: 5714230 (1998-02-01), Kameoka et al.

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