Polyester amide copolymer, and moldings and production processes of the copolymer
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United States of America Patent
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Issued Date -
Jun 8, 2006
app pub date -
Dec 25, 2003
filing date -
Dec 27, 2002
priority date (Note) -
Abandoned
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Abstract
A polyester amide copolymer comprising a copolymer of an aliphatic polyamide (A) and an aliphatic polyester (B), having a weight-average molecular weight of at least 40000 and containing at most 10 wt. % of a fraction having molecular weights of at most 10000, is produced through a production process including (1) a step at 100-150.degree. C. of initial stage of distillation of low-molecular weight fraction including water and initial stage of (poly)esterification, (2) a step at 150-300.degree. C. of polymerization and uniform melting and (3) a step under a reduced pressure of oligomer removal and polymerization. The resultant polyester amide copolymer is excellent in biodegradability and also excellent in physical properties represented by high strength and high heat resistance.
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