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THERMOPLASTIC POLYMER COMPOSITION AND METHOD OF MOLDING PARTS WITH REDUCED SHRINKAGE
THERMOPLASTIC POLYMER COMPOSITION AND METHOD OF MOLDING PARTS WITH REDUCED SHRINKAGE
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机译:热塑性塑料的组成和缩模成型零件的方法
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摘要
A thermoplastic polymer composition incorporating at least about 50 wt % polypropylene, at least about 20 wt % of an elastomer such as EP rubber and at least about 4 wt % plastomer. The plastomer is preferably a single site catalyzed ethylene based copolymer having a density less than about 0.915. By adjusting the amount of the plastomer in the composition, considerable control is secured over post-mold shrinkage of components produced through injection molding operations utilizing the composition. The composition can be prepared as a reactor blend or a melt blend. The composition is particularly useful in producing large components such as bumpers and exterior trim fascia for automobiles.
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