Injection-molded article

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C - Chemistry, Metallurgy

08

L

C08L 23/16 (2006.01) B29C 45/00 (2006.01) B60R 19/03 (2006.01) C08L 23/06 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01)

Patent

CA 2045723

A large-sized exterior part of an automotive vehicle, injection-molded and formed of a polymer material comprising: (A) polypropylene in an amount ranging from 50 to 70 weight %, the polypropylene containing ethylene in an amount not more than 15 weight % relative to the polypropylene and having a MFR (at 230 °C) ranging from 5 to 60 g/10min.; (B) ethylene- propylene copolymer rubber polymerized in presence of a vanadium-based catalyst, in an amount ranging from 5 to 30 weight %, the copolymer containing propylene in an amount ranging from 20 to 40 weight % relative to the ethylene-propylene copolymer rubber and having a Mooney viscosity ML1+4(100°C) ranging from 20 to 80; (C) ethylene-propylene copolymer rubber polymerized in presence of a titanium-based catalyst, in an amount ranging from 5 to 45 weight %, the copolymer containing propylene in an amount ranging from 30 to 70 weight % relative to the ethylene-prolylene copolymer rubber and having a Mooney viscosity MLl+4(100°C) ranging from 20 to 75; and (D) polyethylene in an amount not more than 10 weight %, the polyethylene having a MFR (at 190 °C) ranging from 5 to 50 g/10 min. The injection-molded article has an average thickness ranging from 2 to 6 mm, a flexural elastic modulus ranging from 3000 to 6000 kg/cm2, and a coefficient of linear expansion not higher than 8 X 10-5/°C.

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