| abstract |
The polyethylene composition comprises a first polyethylene, which is an ethylene copolymer having a weight average molecular weight of 70,000 to 250,000 and a molecular weight distribution M w / M n of less than 2.3, a weight average molecular weight of 50,000 to 200,000 and a molecular weight distribution M w / M n of less than 2.3. , A second polyethylene being an ethylene copolymer or an ethylene homopolymer, and the third polyethylene being an ethylene copolymer or an ethylene homopolymer, having a weight average molecular weight of 70,000 to 200,000 and a molecular weight distribution M w /M n of less than 2.3, and , Wherein the first polyethylene has more short-chain branches than the second polyethylene or the third polyethylene. The polyethylene composition has a composition distribution width index CDBI 50 of less than 45% by weight obtained from crystallization elution fractionation (CEF) analysis. The film prepared from the polyethylene composition has a machine direction (MD) of 200 MPa or more (when measured at a film thickness of about 1 mil), 1% secant modulus, (when measured at a film thickness of about 2 mil), a sealing initiation temperature of 85°C or less. (SIT), (Measured at a film thickness of about 2 mil) Hot tag window area (AHTW) of 220 Newtons·℃ or more, (Measured at a film thickness of about 1 mil) Oxygen permeability (OTR ) of 600 cm 3 or more per 100 square inches ), a dart impact strength of 400 g/mil or more, and a machine direction (MD) tear strength of 400 g/mil or more. |