| 摘要 |
<p>A segmented thermoplastic copolyester elastomer containing recurring ester units of at least two types. One type ester unit is derived from symmetrical aromatic dicarboxylic acids and 1,4-butanediol. The copolyester contains about 30-95 percent by weight of this type of ester unit. About 5 to 70 percent by weight are ester units of the second type having side chains having a length between 7 and 30 carbon atoms. The second type of ester units are derived from diols and/or dicarboxylic acids having at least one side chain of 7 to about 30 carbon atoms in length. Such segmented thermoplastic copolyester elastomers are useful in, for example, high pressure hose which has improved characteristics with regard to crystallization rate, tear strength, flexibility and oxidation resistance.</p> |
