Copolyester-ether polymers

摘要

A segmented copolyester-ether polymer comprises 9.5 to 33 percent by weight hard segment residues of polybutylene terephthalate and 0.5 to 67 percent by weight soft segment residues of a polyether polyol comprised of n units of residue (1) and m units of residue (2), wherein the total value of n+m is in the range 2 to 70, m/(n+m) is in the range 0.05 to 0.98, and residues (1) and (2) have the structures: <IMAGE> The polyether polyol is further characterized in that at least 95 percent of the hydroxyl groups are primary hydroxyl groups.