ABSTRACT
The blending of polyoleŽns such as polyethylene or polypropylene with thermoplastic polyurethanes (TPUs) has been a long-sought endeavor. If nothing else, one of the primary goals has been the availability of economically attractive polymer blends with properties close or equal to the best of the polyurethane components. Unfortunately, it has long been observed that polyurethanes and polyoleŽns, with polyethylene in particular, are largely incompatible except at the lowest levels of one in the other. Quite obviously, such incompatibility results in their so-called delamination or separation when formed into molded articles or Žlms, which results in very poor physical properties.
