Thermoplastic olefin composition containing an ethylene polymer for making molded parts having a good paint adhesion/durability balance
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United States of America Patent
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Jan 11, 2000
Grant Date -
N/A
app pub date -
Apr 29, 1997
filing date -
Apr 29, 1997
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Expired
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Abstract
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 .gtoreq.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.
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