METHOD FOR PRODUCING MODIFIED POLYETHYLENE-BASED RESIN, MODIFIED POLYETHYLENE-BASED RESIN AND ITS FILM

摘要

PROBLEM TO BE SOLVED: To provide a polyethylene-based resin which givens blown films having an excellent balance among physical properties such as impact resistance and low thickness deviation. SOLUTION: This method for producing a modified polyethylene-based resin having an increased tanδcomprises producing a polyethylene-based resin which is obtained using a Ziegler type catalyst and has a density of 940 to 970 kg/m<3> , an MFR of 0.01 to 50 g/10 min (temperature: 190 deg.C, load: 49 N) and a tanδif 1.0 to 3.0 at a temperature of 190 deg.C and at an angular frequency of 13.5×10<-2> rad/sec, introducing the polyethylene-based resin into an extruder substantially without bringing the polyethylene-based resin into contact with air,bringing the polyethylene-based resin into contact with a gas containing oxygen in the system, and then melting and kneading the mixture.