Polyether- and Polyester based Adhesives

This leads to a different polarity of the backbone. The Polyether-structure is unpolar, the polyesther-structure is polar. This has some basic consequences:
The polar Polyesther - structure adheres better to metal surfaces (aluminiumfoil and metallized films).
The unpolar Polyether-structure is more able to absorb slip additives. This means that there may be better bonds and a" slip drop"