Honda Giken Kogyo Kabushiki Kaisha

Idemitsu Petrochemical Co., Ltd.

Tokai Kogyo Company Limited

Takayuki Onda

Kenji Hamabe

Osamu Aoki

Yutaka Kobayashi

Atsushi Takeuchi

Renji Maki

Katsuyuki Amano

Disclosed is a side protective moulding having a decorative section and a rib section. The decorative section has a protruding section protruding most with respect to a door, and a curved section extending aslant from the protruding section toward the door. The rib section has a hollow section formed on the back side of the protruding section and a reinforcing leg section extending from the hollow section toward the door. The side moulding is moulded by a hollow injection moulding process. Adopting this moulding process can improve the outside appearance of the side moulding by eliminating sink marks and wrinkles from the surface of the decorative section if a thick wall section for increasing side moulding rigidity and impact strength is formed on the back side of the decorative section.

Side protective moulding for automobiles

A molded protective strip for automobiles is prepared by the gas injection molding of a resin composition which comprises (A) 55 to 75% by weight of polypropylene, (B) 18 to 30% by weight of ethylene-propylene copolymer rubber, and (C) 10 to 20% by weight of talc, has a ratio (MI).sub.PP /(MI).sub.EPR of 10 or less, and a polydispersity index of 20 to 100. (MI).sub.PP and (MI).sub.EPR represents melt indices of the polypropylene of component (A) and the ethylene-propylene copolymer rubber of component (B), respectively. The polydispersity index is calculated from a frequency-storage modulus curve obtained with a composition consisting of components (A), (B), and (C) alone at the temperature of 230.degree. C. The molded protective strip can be prepared without using a vinyl chloride resin, shows almost no heat shrinkage, has a small coefficient of linear expansion, is excellent in dimensional stability, and exhibits excellent appearance.

Molded protective strip for automobiles

A polypropylene resin composition comprising: (a) 50 to 90% by weight of polypropylene, (b) 50 to 10% by weight of an ethylene-.alpha.-olefin copolymer elastomer having a Mooney viscosity (ML 1+4 (100.degree. C.)) of 10 to 100, (c) 0.5 to 10 parts by weight per 100 parts by weight of the total of the amounts of the components (a) and (b) of a linear olefinic polymer containing hydroxyl group which is liquid at room temperature, and (d) 0.5 to 15 parts by weight per 100 parts by weight of the total of the amounts of the components (a) and (b) of a linear olefinic polymer having a melting point of about 70.degree. to about 90.degree. C. and a number-average molecular weight of 1500 to 6000 and containing hydroxyl group or carbonyl group; and a protective strip for automobiles using the polypropylene resin composition are disclosed. Coating immediately after degreasing is made possible and excellent property for coating can be provided by using the polypropylene resin composition.

Polypropylene resin composition and a molded article thereof

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Wako, Japan

Takayuki Onda