Polypropylene Compositions
AssigneeBraskem America, Inc.
InventorsWilliam G. Lutz, John Kaarto, Robert J. Donald
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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.
Claims10
A mineral-filled, polypropylene composition comprising (i) a coupled blend of polypropylene homopolymer and impact modifier, (ii) at least 25 weight percent (wt %) based on the weight of the composition of at least one mineral filler, and (iii) a foaming agent.
Dependencies are inferred from the claim text.