Polypropylene compositions
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United States of America Patent
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Mar 26, 2013
Grant Date -
Oct 20, 2011
app pub date -
Apr 14, 2010
filing date -
Apr 14, 2010
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Abstract
A mineral-filled, polypropylene composition comprises (i) a coupled, impact propylene polymer, and (ii) at least 0.5 weight percent (wt %) based on the weight of the composition of at least one of calcium carbonate and talc. The compositions are useful in the manufacture of three-layer pipe comprising (A) a first or outer non-foam layer; (B) a second or middle foam layer; and (C) a third or inner non-foam layer.
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