Abstract
About 10 years ago it was discovered that highly crystalline polymers such as polypropylene and polyoxymethylene could be extruded in such a manner a s to produce remarkably elastic fibers and films which appeared superficially to behave like rubber or Spandex-type elastomers. Aside from the patent literature [l] these materials remained largely undescribed and unnoticed until the last 2 or 3 years when Clark and co-workers at duPont, and Quynn and co-workers at Celanese have published the first technical data and discussions [2-5].

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