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US H1,518 HGranted
Impact modification of polypropylene with styrene/isoprene triblock copolymers
AssigneeShell Oil Company
InventorsLie K. Djiauw, Michael J. Modic, Richard Gelles, Glenn R. Himes
Life of this patent
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Abstract
Compositions consisting essentially of from 60% to 95% by weight of the polymer components of a high flow polypropylene and from 40% to 5% by weight of a polystyrene-hydrogenated polyisoprene-polystyrene block copolymer have excellent low temperature impact strength and high heat distortion temperature for molding large automobile parts.
Claims4
A polypropylene molding composition, comprising:
- from 60% to 95% by weight of the polymer components of a high flow polypropylene having a melt flow from 50 to 80 dg/min, wherein the polypropylene is selected from a group consisting of homopolymers of propylene, random copolymers of propylene and an olefin selected from ethylene and C.sub.4 -C.sub.10 alpha-olefins, and random terpolymers of propylene with two alpha-olefins selected from ethylene and C.sub.4 -C.sub.10 alpha-olefins;
- and
- from 40% to 5% by weight of the polymer components of a polystyrene-hydrogenated polyisoprene-polystyrene block copolymer having a peak molecular weight from 4,500 to 8,000 for each polystyrene block and a polystyrene content from 13% to 20%.
Dependencies are inferred from the claim text.