Olefin polymers with improved paintability
AssigneeBP Corporation North America Inc.
InventorsAaron K. Ford, William J. Kissel, Chi-Hung Lin, Helene G. Lollis, Constantine Metaxas, Mary K. Trost
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Abstract
Injection moldable thermoplastic polyolefin resins containing from about 20 to about 40 wt % EPR dispersed in a continuous highly isotactic polypropylene having good paintability. Reactor prepared resins, or RTPO resins, containing highly isotactic polypropylene and from 20 to 30 wt % of an EPR component comprising from about 40 to about 55 wt % ethylene are particularly attractive for use in the production of automotive trim and fascia.
Claims20
A reactor olefin polymer composition comprising from about 85 to about 60 wt % isotactic polypropylene as a continuous phase and from about 15 to about 40 wt % of an ethylene-containing polymer consisting essentially of an ethylene-propylene copolymer rubber as a discontinuous phase, said ethylene-propylene copolymer containing from about 40 to about 60 wt % ethylene units, based on combined weight of olefin monomers in said copolymer.
A reactor olefin polymer composition having a flexural modulus, determined according to ASTM D790 at 0.5 in/min., of from about 100 Kpsi to about 180 Kpsi, said composition comprising from about 83 to about 70 wt % isotactic polypropylene as a continuous phase and from about 17 to about 30 wt % of an ethylene-containing polymer consisting essentially of an ethylene-propylene copolymer rubber as a discontinuous phase, said ethylene-propylene copolymer containing from about 40 to about 55 wt % ethylene units, based on combined weight of olefin monomers in said copolymer.
An injection-molded article comprising from about 80 to about 60 wt % isotactic polypropylene as a continuous phase and from about 20 to about 40 wt % ethylene-propylene copolymer as a discontinuous phase, said ethylene-propylene copolymer containing from about 40 to about 60 wt % ethylene units, based on combined weight of olefin monomers in said copolymer.
A method for providing a paintable polypropylene article comprising the steps of (a) providing an injection-moldable reactor polymer composition comprising from about 85 to about 60 wt % isotactic polypropylene as a continuous phase and from about 15 to about 40 wt % of an ethylene-containing polymer consisting essentially of an ethylene-propylene copolymer rubber as a discontinuous phase, said ethylene-propylene copolymer containing from about 40 to about 60 wt % ethylene units, based on combined weight of olefin monomers in said copolymer and (b) injection molding said olefin polymer composition.
Dependencies are inferred from the claim text.