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1. US20020061976 - Propylene polymer composition

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[ EN ]

What is claimed is:

1. A fabricated automotive article comprising a propylene polymer composition comprising:
(a) one or more isotatic propylene polymer and
(b) one or more substantially random interpolymer prepared by polymerizing ethylene and/or one or more α-olefin monomers with one or more vinyl or vinylidene aromatic monomers and/or one or more hindered aliphatic or cycloaliphatic vinylidene monomers, and optionally with other polymerizable ethylenically unsaturated monomer(s).
2. The propylene polymer composition of claim 1 wherein
(a) the isotatic propylene polymer is present in an amount from about 20 to about 95 parts by weight and
(b) the substantially random interpolymer is present in an amount from about 80 to 5 weight percent,
wherein parts by weight are based on the total weight of the propylene polymer composition.
3. The propylene polymer composition of claim 1 is a propylene homopolymer or copolymer having a degree of crystallinity equal to or greater than about 62 percent.
4. The substantially random interpolymer of claim 1 is an ethylene/styrene, ethylene/propylene/styrene, ethylene/styrene/norbomene, or ethylene/propylene/styrene/norbornene interpolymer.
5. The substantially random interpolymer of claim 1 is an ethylene/styrene interpolymer.
6. The propylene polymer composition of claim 1 further comprising (c) a filler in an amount from about 1 part by weight to about 50 parts by weight based on the total weight of the propylene polymer composition.
7. The filler of claim 6 is talc.
8. The propylene polymer composition of claim 1 further comprising (d) an additional polymer which is a polymer other than components (a) and (b) in an amount from about 1 part by weight to about 40 parts by weight based on the total weight of the propylene polymer composition.
9. The additional polymer of claim 8 is high density polyethylene.
10. The propylene polymer composition of claim 1 further comprising (e) a slip agent in an amount from about 0.1 to about 0.5 parts based on the total weight of the propylene polymer composition.
11. The slip agent of claim 10 is erucamide.
12. A process of extruding or molding a propylene polymer composition comprising:
(a) an isotatic propylene polymer and
(b) at least one substantially random interpolymer prepared by polymerizing ethylene and/or one or more α-olefin monomers with one or more vinyl or vinylidene aromatic monomers and/or one or more hindered aliphatic or cycloaliphatic vinylidene monomers, and optionally with other polymerizable ethylenically unsaturated monomer(s)
into a fabricated automotive article.
13. The fabricated automotive article of claim 1 is a bumper fascia, spoiler, pillar, door trim, instrument panel, airbag cover, console, mat, interior skin, weather stripping, window seal, shift lever knob, or soft tough over-moldings for an arm rest.
14. The fabricated automotive article of claim 12 is a bumper fascia, spoiler, pillar, door trim, instrument panel, airbag cover, console, mat, interior skin, weather stripping, window seal, shift lever knob, or soft tough over-moldings for an arm rest.
15. The fabricated automotive article of claim 1 having a coefficient of linear expansion of less than about 85 cm/cm×10 −6/° C. between the temperature range of about −30 to 30° C. and less than about 120 cm/cm×10 −6/° C. between the temperature range of about 20 to about 80° C. and a compression set less than 55 percent.
16. The fabricated automotive article of claim 12 having a coefficient of linear expansion of less than about 85 cm/cm×10 −6/° C. between the temperature range of about −30 to 30° C. and less than about 120 cm/cm×10 −6/° C. between the temperature range of about 20 to about 80° C. and a compression set less than 55 percent.