Sumitomo Chemical Company, Limited

Yuji Kanda

Toshio Sasaki

Tadashi Hikasa

Satoru Hosoda

Kiyoshi Mitsui

Hiroyuki Shiraishi

Yuji Shigematsu

Toshiyuki Kokubo

Yufu Sato

Koji Yamashita

A novel ethylene-.alpha.-olefin copolymer and a molded article formed therefrom, wherein (A) a density is 0.870 to 0.945 g/cm.sup.3, (B) a relation between an activation energy of flow Ea (J/mole K) obtained by measurement of viscoelasticity at at least three temperatures in the molten state and a melt flow rate MFR (g/10 min) satisfies the following equation (1):

Ethylene-.alpha.-olefin copolymer and molded article thereof

The invention provides an olefinic thermoplastic elastomer composition which is excellent in flexibility, processability into sheet and appearance of the resulting sheet and which is able to substitute for flexible polyvinyl chloride. The invention further provides a covering material for industrial parts comprising said composition and a laminate comprising said covering material. The composition comprises a partially crosslinked thermoplastic elastomer I containing an oil-extended olefinic copolymer rubber comprising an olefinic copolymer rubber having a Mooney viscosity of 200-350 or the thermoplastic elastomer I and a partially crosslinked thermoplastic elastomer II containing an oil-extended olefinic copolymer rubber comprising an olefinic copolymer rubber having a Mooney viscosity of 120 or higher and lower than 200 and the composition has a specific viscoelastic characteristics.

Thermoplastic elastomer composition, covering materials for industrial

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Ichihara, Japan

Yuji Kanda