Thermoplastic olefin composition containing an ethylene polymer for making molded parts having a good paint adhesion/durability balance

摘要

A polymer composition for making molded parts including (1) a thermoplastic olefin, (2) a propylene polymer material, and (3) an oxidized polyethylene wax having an acid number of ≧15 mg KOH/g, a high molecular weight ethylene polymer, or mixtures thereof, wherein (2)+ (3) equals at least 22.5 parts per hundred parts of the thermoplastic olefin, has a good paint adhesion/durability balance. Injection molded parts made from this composition have a unique morphology characterized by a continuous matrix phase and discrete particles of a dispersed phase having a specific aspect ratio near the surface of the part and a specific particle size in the core of the part.