Polypropylene impact copolymer compositions

Details Polypropylene impact copolymer compositions Polypropylene impact copolymer compositions

2010-02-24

2011-10-25

Choi, Ling (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C525S088000

Reexamination Certificate

active

08044135

ABSTRACT:
The present invention relates to an impact-resistant olefin polymer composition including a polypropylene matrix having a weight average molecular weight and an ethylene-containing polymer including an ethylene-propylene copolymer having a molecular weight higher than the weight average molecular weight of the polypropylene matrix, the composition containing about 20 to 35 percent xylene solubles, and the xylene solubles fraction of the composition containing less than about 39 weight percent ethylene units, based on the combined weight of olefin monomers in the copolymer. The present invention further relates to impact copolymer compositions with a melt flow rate greater than about 8 that meet or exceed all pallet testing requirements. The compositions have superior stiffness-impact balance performance and excellent gloss and are useful for a number of applications including, but not limited to pallets, water-storm chambers, automotive compounding, septic tanks, bins, pales, crates, totes and plastic containers.

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Chaffin et al., “High-Strength Welds in Metallocene Polypropylene/Polyethylene Laminates,” Science, vol. 288, Jun. 23, 2000.

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