| 摘要 |
The aliphatic copolyesteramide having high degree of polymerization, is prepared by heating a mixture of (A) ester-forming components comprising (a) aliphatic diols and (b) aliphatic dicarboxylic acids and (B) amide-forming components comprising at least one component selected from the group consisting of (a) aliphatic omega -aminocarboxylic acids and (b) equimolar salt of ( alpha ) aliphatic diamines and ( beta ) aliphatic dicarboxylic acids, at temperatures of about 150 DEG to 260 DEG C., substantially under an atmospheric pressure, in the presence of catalyst and in the substantially absence of water, and subsequently heating the resulting esterified product at temperatures of about 200 DEG to 300 DEG C. under a reduced pressure. The obtained copolyesteramide can be formed into various molded articles, such as tubing, having excellent flexibility, toughness, shapability, chemical resistance, heat resistance, hydrolysis resistance and fatigue resistance.
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