Polyether ester elastomers comprising poly(trimethylene-ethylene ether) ester soft segment and alkylene ester hard segment

A polyether ester comprises poly(trimethylene-ethylene ether) ester soft segment and alkylene ester hard segment. Preferably, the polyether ester is a thermoplastic elastomer in which the hard segment comprises C₂ to C₁₂ alkylene ester. The composition is prepared by providing and reacting:

• (a) poly(trimethylene-ethylene ether) glycol
• (b) at least one polyester.

Fiber made from this composition is particularly useful in making films, membranes and fabrics.