| abstract |
A polyethylene composition comprises a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M w /M n of <2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution M w /M n of <2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution M w /M n of <2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a composition distribution breadth index, CDBI 50 obtained from a crystallization elution fractionation (CEF) analysis of <45 weight %. Film made from the polyethylene composition may have a machine direction 1% secant modulus of ≥200 MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of ≤85° C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of ≥220 Newtons·C° (at a film thickness of about 2 mil), an oxygen transmission rate (OTR) of ≥600 cm 3 per 100 inch 2 (at a film thickness of about 1 mil), a dart impact strength of ≥400 g/mil, and a machine direction (MD) tear strength of ≥400 g/mil. |