Foamed and oriented blends of low density polyethylene and polypropylene

摘要

A blend is made of a low density polyethylene and polypropylene. The blend is foamed with a blowing agent. A colorant can be incorporated into the polyethylene and/or into the polypropylene whereupon the two polymers are then blended and foamed, as by extruding with a foaming or expanding agent in the final blend. Sheets, films, rods, ribbons, filaments tows, and other shapes can be extruded. The extrudate is oriented to yield a product having increased opacity and improved sheen.