Examples include polyethylenes such as high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, ultra-high molecular weight polyethylene, an ethylene/vinyl acetate copolymer, an ethylene/ethyl acrylate copolymer and an ethylene/??-olefin copolymer, obtainable using a metallocene catalyst, like an ethylene/octene-1copolymer; polypropylenes s