| 摘要 |
PURPOSE: An air permeable film composition for hot packs is provided to be able to maintain a low air permeability suitable for hot packs for a long time, and to be able to control the heating temperature and the heating duration time of a heating element. CONSTITUTION: An air permeable film composition comprises a metallocene catalyst polyolefin resin, a linear low density polyethylene resin, a low density polyethylene resin, an inorganic filler and an additive. The metallocene catalyst polyolefin resin and the linear low density polyethylene resin simultaneously satisfy Chemical formula 1: 0.915<=D<=0.940, Chemical formula 2: 2.0<=MI<=5.0, Chemical formula 3: 85deg.C<=Tv<=120deg.C and Chemical formula 4: 100deg.C<=Tm<=130deg.C. In the Chemical formulas, D is a density (g/cm^3, 25deg.C), MI is a melt flow index (g/10 min, 190deg.C, 2.16 kg), Tv is a Vicat softening point (deg.C), and Tm is a melting point (deg.C). |
