POLYETHYLENE FOR FILM HAVING EXCELLENT DART FALLING IMPACT STRENGTH AND HIGH CLARITY AND PREPARATION METHOD THEREOF

摘要

PURPOSE: A polyethylene is provided to have good melt flow rate ratio(MFRR) for processing and to have excellent moldability, tensile strength, tear strength, falling impact strength, and transparency. CONSTITUTION: A polyethylene for a film product contains 0.91-0.920 g/cm^3, BOCD(broad orthogonal comonomer distribution) index of 1-5, a molecular weight distribution(weight average molecular weight/number average molecular weight) of 1-3.6, melt flux ratio(MFR20/MFR2) of 5-20 by ASTM1238 at 190°C, and a SCB(short chain branching) content of 1-20 per 1,000 carbon atoms. The melt flow index of the polyethylene(190°C, 2.16 kg load) is 0.05-2 g/10 minutes. The polyethylene is a copolymer of ethylene and alpha-olefin-based comonomer.