The polyethylene, such as low density polyethylene (LDPE) and high density polyethylene (HDPE), and copolymers of ethylene with a C3-10 alpha-olefin, (generally referred to as linear low density polyethylene (LLDPE)), of commerce are normally solid, somewhat flexible, thermoplastic polymers formed by the polymerization of the particular monomer(s) by various methods well known in the art.