Patent ID: 7166178

Claim:
A method for preparing a polyethylene for a protective film which comprises pressurizing ethylene by means of an ultra-high pressure compressor and then polymerizing the ethylene at a reaction temperature of 90° to 300° C. and a reaction pressure of not lower than 167 MPa in the presence of a polymerization initiator, wherein the polyethylene prepared has an MFR of 0.3 to 30 (g/10 min) and a density of 0.913 to 0.930 (g/cm 3 ) and, as a 30 μm thick film thereof, has a haze of 1 to 50 (%) and contains not more than 40 fish-eyes per 10 cm 2 which fish-eyes are not smaller than 30 μm and smaller than 0.20 mm in the major diameter and not more than 1.0 fish-eye per 1.0 m 2 which fish-eye is not smaller than 0.20 mm in the major diameter.