| 摘要 |
The present invention provides a process for producing a resin sheet which has satisfactory surface properties and is inhibited from suffering warpage due to residual stress. The ratio of the difference between the coefficient of linear expansion (S1) of a polycarbonate-containing layer and the coefficient of linear expansion (S2) of a methacrylic-resin-containing layer to the coefficient of linear expansion (S1) of the polycarbonate-containing layer, (S2-S1)/S1, is regulated to -10% to +5%. The glass transition temperature of the methacrylic-resin-containing layer is regulated to 120-160°C. A thermoplastic resin laminate (resin sheet (16)) comprising the polycarbonate-containing layer and the methacrylic-resin-containing layer laminated thereto is extruded in a molten state through a T die (11), is sandwiched between first and second cooling rolls (12, 13), is wound on the second cooling roll (13), is then wound on a third cooling roll (14) to cool the sheet, and is hauled with hauling rolls (15). At the position where the resin sheet (16) separates from the third cooling roll (14), the temperature of the entire resin is regulated so as to be higher by 0-15°C than the glass transition temperature of the polycarbonate-containing layer. |
