THERMOPLASTIC ELASTOMER COMPOSITION
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United States of America Patent
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app pub date -
Dec 7, 2009
filing date -
Jun 18, 2004
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Abstract
Described herein is a composition preparation process of forming an unkneaded mixture of (a) 100 parts by weight of an ethylene-α-olefin-unconjugated polyene copolymer rubber synthesized with a metallocene catalyst, (b) 20 to 350 parts by weight of a crystalline olefin resin, (c) 2 to 25 parts by weight of an alkylphenol-formaldehyde resin, and (d) 5 to 120 parts by weight of at least one polymer selected from the group consisting of a copolymer of a vinyl aromatic compound with a conjugated diene compound, a hydrogenated copolymer obtained by hydrogenating a copolymer of a vinyl aromatic compound with a conjugated diene compound, and a hydrogenated polymer obtained by hydrogenating a polymer of a conjugated diene compound, and kneading the formed unkneaded mixture to form a thermoplastic elastomer composition. This process produces a composition that is excellent in compression set and oil resistance at high temperatures and in flexibility and moldability.
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