ETHYLENE-ALPHAOLEFIN COPOLYMERS AND METHOD FOR PREPARING THE SAME

摘要

PURPOSE: An ethylene-alphaolefin copolymer is provided to ensure the preparation using a catalyst composition including transition metal oxide, to ensure very low density and narrow molecular weight distribution, and excellent processability. CONSTITUTION: An ethylene-alphaolefin copolymer satisfies (a) density of 0.85~0.92 g/cm^3, (b) molecular weight distribution(Mw/Mn, PDI) of 2~3, and (c) processability(K) of chemical formula 1: K = (MI_10/MI_2.16 - PDI) / MI_2.16 and chemical formula 2: : K > 0.0002 × η* + 7.12. In chemical formula 1, MI_10 is a melt index(g/10min) at 190 °C and 10 kg load; MI_2.16 is a melt index(g/10min) at 190 °C and 2.16kg load; and PDI is molecular weight distribution(Mw/Mn).