Ube Industries, Inc.

Toyota Jidosha Kabushiki Kaisha

Kanesi Corporation

Toyota Jidosha Kabushiki Kaisha & Ube Industries, Ltd.

Kouhei Ueno

Tomohiko Akagawa

Takeyoshi Nishio

Takao Nomura

Yoshifumi Nakano

Ikunori Sakai

Osamu Fukui

Saburo Hinenoya

Norihisa Tamashima

Shinji Katsui

Hisayuki Iwai

Nobuya Kawamura

Toshio Yokoi

Hideyo Morita

Kazuyoshi Tanaka

Shigeji Ichikawa

Katsunori Arai

Yasufumi Takasaki

Kazuyoshi Obana

Tatsushi Akou

Yukimasa Hamada

Kaeupshi Ubana

A resin composition for an automobile bumper comprising components (A), (B), and (C) described below:

Resin composition for automobile bumper

A polypropylene resin composition comprising:

Polypropylene resin composition

A reinforced polypropylene resin composition comprising the following components (a) to (e), the total amount of the components (b) and (c) being 2 to 14%:

Reinforced polypropylene resin composition containing glass fiber, mica

The polypropylene resin composition of the present invention comprises specific proportions of a crystalline ethylene-propylene block copolymer, an hydrogenated block copolymer, an amorphous ethylene-propylene copolymer, surface-treated talc, fibrous magnesium oxysulfate of granular form and a metal soap. This resin composition is well balanced in rigidity and impact resistance, has good mar resistance, and can be preferably used in large-sized parts for automobiles, particularly instrument panels for automobiles.

A fibrous magnesium oxysulfate of granular form according to the present invention has an apparent specific gravity of 0.13-0.25, an oil absorption of 250-600 ml/100 g, a fiber diameter of 0.1-2.0 .mu.m and a fiber length of 10-100 .mu.m. The thermoplastic resin composition obtained by incorporating the magnesium oxysulfate into a thermoplastic resin has good properties and good appearance.

Fibrous magnesium oxysulfate of granular form and a method of producing

The present invention relates to a polypropylene composition comprising a crystalline ethylene-propylene block copolymer having an ethylene content of 5-20% by weight and a melt flow index of 11-90, a thermoplastic elastomer, an amorphous propylene-.alpha.-olefin random copolymer having a number-average molecular weight of 1,000-20,000 and a propylene content of 40-95% by weight and an inorganic filler. This composition can be made into a molded article having no flow mark on the surface. The molded article is superior in rigidity, heat deformation resistance, low temperature impact resistance and coatability, has appearance free from waviness, voids, etc., and is suitable for use particularly in high quality bumper for automobiles.

Polypropylene composition

A polypropylene resin composition obtained by mixing a crystalline ethylene-propylene block copolymer, an amorphous ethylene-propylene copolymer, talc and fibrous magnesium oxysulfate and then, at the time of melt-kneading the mixture, adding a metal soap to the mixture, retains the fiber length of the fibrous magnesium oxysulfate and has high rigidity with the addition of a small amount of the metal soap.

A fiber-reinforced thermoplastic resin composition comprises a composition of a thermoplastic resin in an amount of 50 to 99% by weight and a fibrous magnesium oxysulfate in an amount of 1 to 50% by weight, and magnesium oxide and/or zinc oxide in an amount of 0.01 to 30 parts by weight per 100 parts by weight of the fibrous magnesium oxysulfate.

Fiber-reinforced thermoplastic resin composition

Fibrous magnesium oxysulfate granular form and thermoplastic resin

The polypropylene resin composition of the present invention can be obtained by melt mixing:

Impact-resistant polypropylene resin compositions

The present invention relates to a reinforced polypropylene composition comprising a polypropylene component (a modified polypropylene or a mixture of said modified polypropylene and an unmodified polypropylene), an ethylene-propylene copolymer, a glass fiber and mica having an average particle diameter of 40-160 .mu.m and an average aspect ratio of 30-85. This composition can provide molded articles of very low warpage and is useful for the production of molded articles, particularly core materials of instrument panels for automobiles requiring high rigidity, high heat resistance and deformation resistance.

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Sakai, Japan

Kouhei Ueno