| abstract |
A polyethylene, having 1 to 60 methyl branches and 1 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°C in o-dichlorobenzene, and a method for producing the same 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):n where R¹, R², R³ and R⁴ may be the same or different from each other and represent n-alkyl, isoalkyl, aryl or trialkylsilyl, groups, and the polymerization is carried out in the presence of α-olefin. |