Olefin copolymers and processes for preparing same.

In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from α-olefin of 3 ∼ 20 carbon atoms, said ethylene copolymers having [A] a density of 0.85 ∼ 0.92 g/cm3,[B] an intrinsic viscosity [η] as measured in decalin at 135°C of 0.1 ∼ 10 dl/g,[C] a ratio (M¯w/M¯n) of a weight average molecular weight (M¯w) to a number average molecular weight (M¯n) as measured by GPC of 1.2 ∼ 4, and[D] a ratio (MFR10/MFR2) of MFR10 under a load of 10 kg to MFR2 under a load of 2.16 kg at 190°C of 8 ∼ 50, and being narrow in molecular weight distribution and excellent in flowability.