LINEAR LOW DENSITY POLYETHYLENE RESIN COMPOSITION HAVING HIGH IMPACT STRENGTH AND COMPRISING HIGH STRENGTH-LLDPE AND CONVENTIONAL LDPE

摘要

PURPOSE: Provided is a linear low density polyethylene resin composition for films, which has high falling dart impact strength, tear strength and film processability, while maintaining overall physical properties of film. CONSTITUTION: The linear low density polyethylene resin composition comprises: 80-99.9 wt% of high-strength linear low density polyethylene, obtained by the copolymerization of ethylene with CH2=CHR, wherein R is a C2-C8 alkyl group, in the presence of a magnesium-supported type non-metallocene catalyst; and 0.1-20 wt% of conventional low density polyethylene. The high-strength LLDPE has a melt flow index of 0.2-20 g/10 min. as measured by ASTM D-1238(190 deg.C, 2.16 kg) and density of 0.910-0.930 g/cm3.