Title:
ALIPHATIC POLYESTER COPOLYMER
Document Type and Number:
Japanese Patent JP3418070
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an aliphatic polyester copolymer having biodegradability and softness and further having sufficient strength, elongation and thermal stability available to a practical use because of a high molecular weight.
SOLUTION: This aliphatic polyester polymer is the aliphatic copolyester obtained by performing a condensation polymerizatiorx in the presence of a catalyst comprising a germanium compound, and has (1) 30-70mol% aliphatic hydroxy carboxylic acid unit, (2) 15-35mo1% aliphatic diol unit and (3) 15-30mol% aliphatic dicarboxylic acid unit. A part of the aliphatic hydroxy carboxylic acid unit is an α-hydroxy carboxylic acid unit and the percentage of the α-hydroxy carboxylic acid is 0.1-100mol% based on the amount of the hydroxy carboxylic acid unit and ≤40mol% based on the amount of the whole constituting units. The number average molecular weight of the copolyester is 1×104-2×105.
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Inventors:
Keiko Tanikawa
Atsushi Kasai
Atsushi Kasai
Application Number:
JP25371596A
Publication Date:
June 16, 2003
Filing Date:
September 04, 1996
Export Citation:
Assignee:
Mitsubishi Chemical Corporation
International Classes:
C08G63/60; C08G63/85; C08G63/86; C08L101/16; (IPC1-7): C08G63/86
Domestic Patent References:
| JP8165339A |
Attorney, Agent or Firm:
Kazuhiko Okada
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