| 摘要 |
PROBLEM TO BE SOLVED: To suppress occurrence of warp by forming methyl-methacrylate copolymer on entire or surface of a sheet by altering a blending ratio of methyl methacrylate and acrylic acid and/or methacrylic acid by a molding method (extruding method or casting method) of the sheet, thereby raising heat resistance. SOLUTION: At the time of forming the sheet by an extruding method in the case of forming copolymer on entire or at least surface of the sheet with methyl methacrylate and acrylic acid and/or methacrylic acid, methyl- methacrylate copolymer is formed by using 99 to 80 wt.% of methyl methacrylate and 1 to 20 wt.% of acrylic acid and/or methacrylic acid, at the time of forming the sheet by casting method, 99 to 70 wt.% of methyl methacrylate and 1 to 30 wt.% of acrylic acid and/or methacrylic acid is used. Thus, a noise resistant and burning resistant barrier can be obtained. |
