| 摘要 |
PROBLEM TO BE SOLVED: To obtain a corrugated panel which is excellent in weatherability and natural lighting and can suppress the temperature increase below the panel by laminating a weatherable resin layer to at least one side of a substrate made by compounding a polycarbonate resin with a specified amount of a near-infrared absorber. SOLUTION: The substrate is made by compounding 100 pts.wt. polycarbonate resin with 0.05-1 pt.wt. near-infrared absorber, Generally, an acrylic resin film is used as the weather-resistant resin layer, though a filmy composition prepared by compounding a polycarbonate resin, as the main ingredient, with polystyrene beads and a high concentration of an ultraviolet absorber can also be used; in this case, 100 pts.wt. polycarbonate resin is compounded preferably with 0.01-2 pts.wt. polystyrene beads and 1-20 pts.wt. ingredient comprising ultraviolet absorbers of formulas I and II in a wt. ratio of (95/5)-(5/95). The weather- resistant resin layer is formed usually in a thickness of 0.01-0.10 mm. |
