Sumitomo Chemical Company, Limited

Noboru Komine

Tatsuo Hamanaka

Tadashi Hikasa

Hiroyuki Harada

Hironobu Shigematsu

Norimasa Oda

Yuji Gotoh

Tsuyoshi Moriguchi

Masamichi Ishibashi

Hiroshi Toyoda

Keitaro Kojima

Yuji Goto

A process for producing a thermoplastic elastomer composition comprising the step of crosslinking dynamically at least the following components (A) to (C) in the presence of a crosslinking agent: (A) 10 to 50% by weight of an oil-extended ethylene-&#x3b1;-olefin-non-conjugated diene copolymer rubber having a density of 850 to 900 kg/m, and a Mooney viscosity (ML100&#xb0; C.) of 30 to 150, (B) 20 to 60% by weight of an ethylene-&#x3b1;-olefin copolymer having a density of 850 to 910 kg/m, and a melt flow rate of 0.05 to 80 g/10 minutes measured at 230&#xb0; C. under a load of 21.18 N, and (C) 20 to 60% by weight of a propylene resin, the total amount of the components (A) to (C) being 100% by weight; and an air-bag cover comprising a thermoplastic elastomer composition produced according to said process.

Process for producing thermoplastic elastomer composition, and air-bag cover

Process for producing thermoplastic elastomer composition and thermoplastic elastomer composition

A process for producing a thermoplastic elastomer composition which comprises dynamically cross-linking an olefine copolymer rubber and an olefine plastic using a twin-screw extruder, said process being characterized in that said twin-screw extruder comprises one or more kneading zones within a dynamically cross-linking area and the first kneading zone among said zones comprises a screw with forward kneading disks having a minimum thickness (T.sub.min) of less than 13 mm per disk. Said method enables production of a thermoplastic elastomer composition of good quality regardless of the scale of production.

Process for producing thermoplastic elastomer composition

Provided is a method for producing a thermoplastic elastomer composition excellent in flexibility, mechanical properties and extrusion moldability which comprises directly feeding a particulate olefinic copolymer rubber (A) having a particle shape index .alpha. defined below of 0.1-0.9 and an olefinic plastic (B) to a continuous kneading extruder to carry out melt kneading and then, feeding an organic peroxide to downstream side of said extruder to carry out dynamic crosslinking:

Method for producing thermoplastic elastomer composition

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Chiba, Japan

Noboru Komine