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AssigneeSumitomo Chemical Company, Limited
InventorsTatsuyuki Mitsuno, Hideo Shinonaga, Akio Daimon, Satoru Hosoda
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A thermoplastic elastomer composition which is excellent in melt-flowability and is able to afford injection molded articles superior in appearance is provided, which is a mixture comprising (A) 20-50 parts by weight of an olefinic copolymer rubber, (B) 50-80 parts by weight of an olefinic plastic having a ratio of melt index M.sub.1 /M.sub.0 of 2-50 wherein M.sub.0 is a melt index of the plastic before subjected to thermal decomposition with organic peroxide and M.sub.1 is a melt index of the plastic after subjected to the thermal decomposition with the organic peroxide, sum of (A) and (B) being 100 parts by weight, (C) 5-25 parts by weight of a mineral oil and (D) 0.1-3 parts by weight of a bismaleimide compound, said mixture being dynamically heat treated with (E) an organic peroxide after bismaleimide compound (D) is homogeneously dispersed in the mixture.
A thermoplastic elastomer composition which comprises a mixture comprising (A) 20-50 parts by weight of an olefinic copolymer rubber, (B) 50-80 parts by weight of a thermally pre-decomposed olefinic plastic having a ratio of melt index M.sub.1 /M.sub.0 of 2-50 wherein M.sub.1 /M.sub.0 is a thermal decomposition degree of olefinic plastic thermally pre-decomposed, M.sub.0 is a melt index of the plastic before being subjected to thermal decomposition with organic peroxide and M.sub.1 is a melt index of the plastic after being subjected to the thermal decomposition with the organic peroxide, sum of (A) and (B) being 100 parts by weight, (C) 5-25 parts by weight of a mineral oil, (D) 0.1-3 parts by weight of a bismaleimide compound, and (E) an organic peroxide.
A process for producing a thermoplastic elastomer composition which comprises preparing a mixture of (A) 20-50 parts by weight of an olefinic copolymer rubber, (B) 50-80 parts by weight of a thermally pre-decomposed olefinic plastic having a ratio of melt index M.sub.1 /M.sub.0 of 2-50 wherein M.sub.1 /M.sub.0 is a thermal decomposition degree of olefinic plastic thermally pre-decomposed, M.sub.0 is a melt index of the plastic before being subjected to thermal decomposition with organic peroxide and M.sub.1 is a melt index of the plastic after being subjected to the thermal decomposition with the organic peroxide, the sum of (A) and (B) being 100 parts by weight, (C) 5-25 parts by weight of a mineral oil and (D) 0.1-3 parts by weight of a bismaleimide compound, said bismaleimide compound (D) being homogeneously dispersed in said mixture, and then dynamically heat treating said mixture in the presence of (E) an organic peroxide.
Dependencies are inferred from the claim text.