| 摘要 |
PURPOSE:To provide the titled cap having excellent creep and stress crack resistance, by using a PE compsn. comprising a specified PE and an ethylene/alpha- olefin copolymer. CONSTITUTION:A PE compsn., MFR2 (melt flow rate measured at 190 deg.C under the total load of 2.16kg) of 0.3-30g/10min, density of 0.945-0.965g/cm<2> and high shearing flow rate (HSFR) of 600sec<-1>, obtained by mixing 20-70wt% PE, MFR2 of 5-2,000g/10min and density of 0.965-0.975g/cm<3>, with 80-30wt% ethylene/alpha-olefin copolymer, MFR2 <=15g/10min, MFR10 (melt flow rate measured at 190 deg.C under the total load of 10.0g) <=15g/10min and density of 0.890- 0.950g/cm<3>, is used to make a cap for containers for carbonated beverages. EFFECT:A cap having excellent sealing performance and shock resistance without deformation by internal pressures or external forces and free from gas leakage from sealing section may be obtained. |
