| 摘要 |
PURPOSE:To prevent a laminated product from becoming white and also improve scratch resistance by laminating a polyvinylbutylal sheet layer and a glass sheet layer sequentially on a polycarbonate resin sheet layer having a weight average molecular weight of 40,000 or higher. CONSTITUTION:A polycarbonate resin sheet PC layer 3 having a weight average molecular weight of 40,000 or higher, a polyvinylbutylal sheet PVB layer 2 and a glass sheet layer 1 are stacked over each other. After this, this laminated product is placed in a decompressed atmosphere so that air is removed sufficiently from the inter-layer space and the layers are allowed to stick to each other under thermal pressurized conditions. The PC sheet layer recommended is a sheet having a weight average molecular weight of 20,000 or higher and biaxially stretched by a factor of 2 or more in terms of area ratio. The PVB sheet layer acts to adhere the glass sheet to the PC sheet layer, prevent the laminated product from cracking due to a bimetal effect during a cool/heat cycle test following the generation of a crack on account of a difference in the coefficients of thermal expansion of the glass sheet layer and the PC sheet layer, and improve the anti-impact properties of the laminated product. |
