| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminated plate configured to prevent curvature deformation under a high temperature environment.SOLUTION: A laminated plate is formed by melting and coextruding a polycarbonate resin and an acrylic resin, and has a layer made of the acrylic resin at least on one surface of a layer made of the polycarbonate resin. A distance (L) from one surface of the polycarbonate resin layer in a thickness direction in a cross section orthogonal to an extruding direction is plotted on the X axis, and a difference (&Dgr;N) between a birefringence (N) with respect to light having a wavelength of 546 nm at the distance (L) and a birefringence (N) with respect to the light having a wavelength of 546 nm at the distance (L) after heating the laminated plate at 80°C for one hour is plotted on the Y axis. An absolute value of a value of inclination in a linear expression of X and Y calculated by a least-squares method is not more than 0.3. |
