| 摘要 |
<p>PROBLEM TO BE SOLVED: To prepare a biaxially oriented polystyrene-based sheet having sufficient transparency, practical strength and excellent heat resistance, and to provide its formed article. SOLUTION: The styrene-based copolymer comprising at least one monomer selected from acrylic acid, methacrylic acid, and maleic anhydride and styrene is characterized in that a HAZE value is <5%, when the copolymer is melted and kneaded with polystyrene in a weight ratio of 7:3. The biaxially oriented polystyrene-based sheet is characterized in that the sheet obtained from the styrene-based copolymer satisfies specific relaxation-stress conditions. An article is obtained by forming the sheet.</p> |
