| 摘要 |
PURPOSE:To contrive to obtain stably the sheet excellent in transparence, the resistance for permeability of moisture and thermoforming property, and having sufficient n-HT eluation amount for a by annealing a specified polypropylene resin composition at the temperature equal to or higher than 50 deg.C for 30min or more after said resin composition has benn sheeted at a specified chill roll temperature. CONSTITUTION:The used amount of hydrogenated petrol resin is caused to be 3-20pts.wt. to 100pts.wt. polypropylene resin, and the polypropylene resin and hydrogenated petrol resin are preliminarily constituted into a resin composition with polypropylene resin stabilizer, and then is sheeted and annealed. The sheeting of said resin composition is carried out at the chill roll temperature equal to or higher than 70 deg.C, whereby n-HT eluation amount is decreased. The annealing is carried out at the temperature range of 50-130 deg.C, and the annealing time is caused to be equal to or more than 30min, whereby the polypropylene sheet for PTP package is excellent in the resistance for permeability of moisture, transparence and safety, and the sheet excellent also in thermoforming property at PTP package may be obtained. |
