Abstract: A polyolefin resin composition comprising (A) an ethylene-based polyolefin having a density of 0.865 to 0.980 g/cm3 and MFR of 0.01 to 50 g/10 min, (B) a phosphorous compound, and (C) at least one heat stabilizer selected from the group consisting of a phenol-based heat stabilizer and a tocopherol-based heat stabilizer. The polyolefin resin composition has excellent heat resistance, moisture resistance and discoloration resistance, and also when used as a packaging material, does not impair the taste of contents to be packaged, such as flavor or odor, and therefore does not impair the taste of the contents.

Abstract: A sealant resin composition for retort packaging film comprises a high density polyethylene as the main resin component and a linear low density polyethylene polymerized by use of the metallocene catalyst. A sealant film produced therefrom is resistant to whitening, heat fusion, heat deformation after being subjected to boiling sterilization treatment and prevent breakage of pouches produced therefrom even at low temperatures because of its high impact strength and heat sealing strength.

Abstract: Disclosed is a polyethylene resin composition for heavy-duty packaging bag, which has a specific MFR, a specific density and a specific melt tension and which comprises (I) a linear low-density polyethylene resin prepared from ethylene and an .alpha.-olefin of 4 or more carbon atoms and having a specific MFR, a specific molecular weight distribution and a density of 0.900 to 0.918 g/cm.sup.3, (II) a linear medium or high-density polyethylene resin having a density of 0.935 to 0.970 g/cm.sup.3 and (III) a high-pressure low-density polyethylene resin having a density of 0.915 to 0.924 g/cm.sup.3, in a specific ratio of components. Also disclosed is a polyethylene resin film prepared from said composition. The composition is able to provide a film which is excellent in low-temperature properties such as low-temperature drop-bag strength and can be advantageously used for a heavy-duty packaging bag even in a cold district of below-freezing temperature.