| 摘要 |
PROBLEM TO BE SOLVED: To provide an LLDPE blown film, greatly improved in physical properties to the conventional ones, wherein lowering of tear strength is suppressed by suppressing anisotropy of film in film-molding by blown film extrusion, and also anisotropy of tear strength is suppressed by displaying full transparency without adding HPLD. SOLUTION: The linear low-density polyethylene film is produced from a linear ethylene-α-olefin copolymer by blown film extrusion, wherein this film contains no low-density polyethylene produced by high pressure process (hereafter, referred to as HPLD), the density in the range of 0.910-0.955 (g/cm<3> ), film thickness d [μm], haze A[%] and density D, satisfying A<(0.001 d<2> +3)×(20D-17.2), and the ratio T(MD)/T(TD) of machine direction Elmendorf tear strength T(MD) to cross direction tear strength T(TD) of film and carbon numberαofα-olefin to copolymerize with ethylene satisfying T(MD)/ T(TD)>1.2×EXP[-120×(D-0.913)]×(1-0.6<α-2.8> ). |
