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US 5,492,967 AGranted
Impact modification of polypropylene with styrene/isoprene tetrablock copolymers
AssigneeShell Oil Company
InventorsLie K. Djiauw, Michael J. Modic, Richard Gelles, Glenn R. Himes
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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-hydrogenated polyisoprene block copolymer have excellent low temperature impact strength and high heat distortion temperature for molding large automobile parts.
Claims2
A polypropylene molding composition, consisting essentially of:
- 90% by weight of the polymer components of a high flow polypropylene having a melt flow from 50 to 80 dg/min;
- 10% by weight of the polymer components of a polystyrene-hydrogenated polyisoprene-polystyrene-hydrogenated polyisoprene block copolymer, wherein each polystyrene endblock has a peak molecular weight from 4,500 to 8,000, each hydrogenated polyisoprene midblock has a peak molecular weight from 35,000 to 55,000, each polystyrene midblock has a peak molecular weight from 4,500 to 9,000, and each hydrogenated polyisoprene endblock has a peak molecular weight that is from 15% to 35% of the peak molecular weight of the hydrogenated polyisoprene midblocks;
- and
- from 0 to 80 parts of a filler per 100 parts of the total polymer components.
1 more element
Dependencies are inferred from the claim text.