Prime Polymer Co., Ltd.

Mitsui Chemicals, Inc.

Yoshio Sugimoto

Ikunori Sakai

Tomohiko Akagawa

Keita Nagano

Tatsuya Kusumoto

Kaoru Inoue

Takao Mizoshita

Masamichi Naito

Kazuhiro Doi

Kenta Tsubohara

Yusuke Umetani

Yuichi Miyake

Naoki Shoji

Toru Fukada

Frank E Jones

Hiroshi Suenari

Mitsuru Fujisawa

Yoshiaki Tsukahara

Noriaki Fujiyama

Satoko Toei

A polypropylene-based resin composition including 100 parts by weight of the following component (A), 18 parts by weight or more and 65 parts by weight or less of the following component (B), 6 parts by weight or more and 45 parts by weight or less of the following component (C), 25 parts by weight or more and 60 parts by weight or less of the following component (D), 0.1 part by weight or more and 6.5 parts by weight or less of the following component (E) and 0.15 part by weight or more and 5.0 parts or less by weight of the following component (F):

Polypropylene resin composition

Polypropylene resin compositions are suited for injection molding and are capable of giving molded articles having excellent mechanical properties, reduced tendency to cause flow marks or weld marks, low gloss, and superior scratch resistance. A polypropylene resin composition includes: an amount of a resin composition (F) including a polypropylene (A), an ethylene-&#x3b1;-olef in copolymer or an ethylene-&#x3b1;-olefin-diene copolymer (B-I) having MFR of less than 0.4 g/10 min, an ethylene-&#x3b1;-olefin copolymer (B-2) having MFR of 0.5 to less than 20 g/10 min, and an inorganic filler (C); and specific amounts relative to the resin composition (F) of a modified polypropylene (D) and a surface modifier (E).

To provide a resin composition comprising a polypropylene resin composition and an aluminum flake pigment for use as an automotive resin composition, which is excellent in mechanical strength, physical properties and flowability, and enables to produce molded products showing good metallic appearance. A composition comprising a crystalline propylene/ethylene block copolymer, an elastomeric polymer and an inorganic filler is a preferred example of the polypropylene resin composition, and aluminum flakes surface-coated with a polymer containing as constituent units acrylic acid, an acrylic acid ester, epoxylated polybutadiene and divinylbenzene are preferred examples of the aluminum flake pigment.

Resin composition for automotive parts

A propylene resin composition comprising (A) a crystalline propylene block copolymer in an amount of 89 to 30% by weight, which has a specific content of a 23&#xb0; C. n-decane-soluble component, said soluble component having a specific intrinsic viscosity [&#x3b7;]a as measured in decalin at 135&#xb0; C., has a specific melt flow rate (MFR, 230&#xb0; C., load of 2160 g), and has a specific isotactic pentad fraction of a polypropylene homopolymer portion as measured byC-NMR, (B) a crystalline propylene block copolymer in an amount of 5 to 25% by weight, which has a specific content of a 23&#xb0; C. n-decane-soluble component, said soluble component having a specific intrinsic viscosity [&#x3b7;]b as measured in decalin at 135&#xb0; C., has a specific melt flow rate (MFR, 230&#xb0; C., load of 2160 g), and has a specific isotactic pentad fraction of a polypropylene homopolymer portion as measured byC-NMR, (C) an elastomeric polymer in an amount of 1 to 20% by weight, which has a melt flow rate (MFR, 230C, load of 2160 g) of 0.5 to 30 g/10 min, and (D) an inorganic filler in an amount of 5 to 25% by weight.

Propylene resin composition

A resin composition for automotive exterior applications, which comprises 50 to 70% by weight of crystalline propylene-ethylene block copolymer, 18 to 25% by weight of elastomeric polymer and 15 to 25% by weight of inorganic filler. The elastomeric polymer is a mixture of a copolymer rubber produced from ethylene and an &#x3b1;-olefin having 6 or more carbon atoms, an ethylene-&#x3b1;-olefin-nonconjugated polyene random copolymer, and a hydrogenated styrene-conjugated diene block copolymer. This resin composition exhibits excellent processibility, and possesses good balance of physical properties including flexural modulus, impact resistance, hardness and brittleness temperature. The moldings fabricated from it gives good appearance free of any remarkable flow mark or weld mark on the surface.

Resin composition for automotive exterior parts

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Ichihara, Japan

Yoshio Sugimoto