| 摘要 |
<p>A polyetherester copolymer has hard and soft segments of the structural formulae <CHEM> wherein D is the non-hydroxylic residue of a saturated aliphatic or cyclic diol having 2 to 8 carbon atoms, R is the non-carboxylic residue of an aromatic, aliphatic or cyclic dicarboxylic acid having a molecular weight less than about 500, and G is a polyether having recurring oxyalkylene units and a molecular weight about 300 to 4,000, and the polymer is branched as a result of having been made from monomers that include a primary or secondary amino branching agent.</p> |
