| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an acrylic resin plate suppressed in warpage deformation in a high-temperature environment. <P>SOLUTION: This acrylic resin plate is obtained by subjecting an acrylic resin to melt extrusion molding. In the acrylic resin plate, an absolute value of a gradient value in a primary expression of X and Y calculated by a least-squares method by plotting a distance (L) from one-side surface of the resin plate in the thickness direction on a cross-sectional surface orthogonal to the extrusion direction, and an absolute value (ΔN) of a difference between a birefringence (N<SB POS="POST">0</SB>) with respect to light having a wavelength of 546 nm at the distance (L) and a birefringence (N<SB POS="POST">1</SB>) with respect to light having a wavelength of 546 nm at the distance (L) after the resin plate is heated at 80°C for 1 h on the X-axis and the Y-axis, respectively, is set ≤6×10<SP POS="POST">-3</SP>. <P>COPYRIGHT: (C)2013,JPO&INPIT |
