Eneos Materials Corporation

Osamu Kose

Yuki Sato

Masato Kobayashi

Shouhei Sasama

Ryoji Usui

Provided is a thermoplastic elastomer composition obtained by melt-kneading an ethylene/α-olefin/non-conjugated polyene copolymer rubber (A) that is a copolymer of ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated polyene, a polyolefin resin (B), and a mineral oil-based softening agent (C) in the presence of an organic peroxide (D) and a crosslinking aid (E), the thermoplastic elastomer composition having a shear viscosity of from 5 Pa·s to 20 Pa·s at 140° C. and 10,000 s.

Thermoplastic elastomer composition and automobile weather strip

Provided is a thermoplastic elastomer composition obtained by melt-kneading (A) an ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer rubber that is a copolymer of ethylene, an &#x3b1;-olefin having 3 to 20 carbon atoms and a non-conjugated polyene, (B) a polyolefin resin and (C) a mineral oil-based softening agent in the presence of (D) a crosslinking agent, at least part of the ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer rubber (A) being crosslinked, the thermoplastic elastomer composition having a sea-island structure in which the ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer rubber (A) is dispersed as a dispersed phase (island phase) in a continuous phase (sea phase) of the polyolefin resin (B), and when a cross-section of the composition is observed with an atomic force microscope (AFM), a ratio of (b) a local elastic modulus of the continuous phase to (a) a local elastic modulus of the dispersed phase being from 10 to 30.

Growing community of inventors

Minato-ku, Japan

Osamu Kose