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AssigneeSumitomo Chemical Company, Limited
InventorsYoshinobu Nozue, Naoko Ochi, Yasutoyo Kawashima
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An ethylene-α-olefin copolymer wherein the copolymer has a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, the density (d) is 860 to 950 kg/m3, the melt flow rate (MFR) is 1 to 100 g/10 min, the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is 4 to 30, the ratio (Mz/Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2 to 5, the swell ratio (SR) is 1.8 or more, and the characteristic relaxation time (τ) obtained by linear viscoelasticity measurement is 0.01 to 10 seconds.
An ethylene-α-olefin copolymer wherein the copolymer has a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, the density (d) is 860 to 950 kg/m3, the melt flow rate (MFR) is 1 to 100 g/10 min, the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is 4 to 30, the ratio (Mz/Mw) of the Z average molecular weight (Mz) to the weight average molecular weight (Mw) is 2 to 5, the swell ratio (SR) is 1.8 or more, and the characteristic relaxation time (T) obtained by linear viscoelasticity measurement is 0.01 to 10 seconds.
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