| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat-resistant biaxially oriented copolystyrene sheet which is superior to a biaxially oriented polystyrene sheet in terms of heat resistance, has practical strength and the features that the sheet keeps transparency when mixed with polystyrene, and can replace polystyrene in a short time in the production process of a biaxially oriented sheet and an article molded from the sheet. SOLUTION: The copolystyrene is obtained from a monomer mixture of styrene and at least one of acrylic acid, methacrylic acid, and maleic anhydride. The amount of the comonomer is below 4.0 mass%. The Vicat softening point of the copolystyrene is at least 105 deg.C. The biaxially oriented copolystyrene sheet meets specified relaxation stress conditions. A container formed from the sheet is also provided.</p> |
