| 摘要 |
A polyethylene, having 1 to 60 methyl branches and l to 60 hexyl or higher branches per 1000 carbon atoms, a g-value of 0.5 to 0.8, and a limiting viscosity ¢?! of 0.005 to 20.0 dl/g as measured at 140 .degree.C in o-dichlorobenzene, and a method for producing the same by polymerizing ethylene using a catalyst system comprising a coordination nickel compound of zero- or two-valent nickel and an aminobis(imino)phosphorane represented by a general formula (I): (see fig.I) where R1, R2, R3 and R4 may be the same with or different from each other and are respectively n-alkyl, isoalkyl, aryl or trialkylsilyl, in the presence of .alpha.-olefin.
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