Abstract: The invention relates to a multilayer polyolefin film composed of at least three layers, comprising a) a core layer A functioning as base layer and composed of at least one amorphous polyolefin or of a mixture of at least one semicrystalline polyolefin and 5.0% by weight or more of at least one amorphous polyolefin and b) on the two sides, outer layers B and C, which are identical or different, composed of a polyolefin (polyethylene, polypropylene) and/or a mixture composed of polypropylene and of an amorphous polyolefin. The films of the invention have very good thermoformability together with low shrinkage. The chemical structure of the core layer A gives exceptionally low water absorption and superior barrier action with respect to water vapor. The invention further relates to the use of this film and to a process for its production.

Abstract: The present invention relates to a process for reducing the toughness of moldings made from plastic, which comprises melting and mixing at least one semicrystalline polymer and at least one amorphous polyolefin in a heatable mixing assembly, processing the resultant mixture to give a polymer molding composition, and processing the polymer molding composition to give moldings. The moldings have improved machining properties.