| 摘要 |
PURPOSE:To obtain a film having a high gas permeability, excellent moldability and good touch, appearance and strength, by uniaxially or biaxially stretching a film formed from a specified polyethylene resin composition. CONSTITUTION:A film formed from a resin composition comprising 100pts.wt. linear low-density polyethylene resin having a density of 0.870-0.915g/cm<2> and containing 18-45wt% component which can be extracted with xylene at normal temperature and has a weight-average molecular chain length of 1,000-9,000Angstrom and 50-400pts.wt. filler is uniaxially stretched at a lengthwise stretch ratio of 2-8 at 50-80 deg.C or said film is stretched at a lengthwise stretch ratio of 1.1-8.0 at 40-100 deg.C and further stretched at a crosswise stretch ratio of 6.0 or below at 70-100 deg.C to obtain a biaxially stretched film. When the mixing proportion of the filler is further increased in producing said gas-permeable film, a nonionic surfactant is used to improve the uniform dispersibility of the filler. |
