| 摘要 |
An elastomeric copolyester having a multiplicity of recurring intralinear long chain and short chain ester units connected through ester linkages wherein: (A) about 75-96 weight percent of said short chain ester units are represented by the following formula <IMAGE> (a) (B) about 4-25 weight percent of said long chain ester units are selected from units represented by the following formulas <IMAGE> (b) <IMAGE> (c) wherein G is a divalent radical remaining after removal of hydroxyl groups from a poly(alkylene oxide) glycol having a number average molecular weight of about 400-1100 and a carbon-to-oxygen atomic ratio of 3-4, R is a divalent radical remaining after removal of carboxyl groups from dicarboxylic acids which are provided as a mixture comprising: (1) about 50-90 weight percent terephthalic acid, (2) about 5-25 weight percent of at least one hexacarbocyclic dicarboxylic acid in which the carboxyl groups are attached to the hexacarbocyclic nucleus in a 1,2- or 1,3-relationship (3) about 5-25 weight percent of at least one aliphatic dicarboxylic acid containing 6 to 12 carbon atoms and having at least 4 carbon atoms between carboxyl groups, and R' is a divalent radical remaining after the removal of carboxyl groups from dimer acid.
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