| 摘要 |
<p>PURPOSE: To provide a plastic laminated sheet excellent in heat resistance, rigidity, surface smoothness, and transparency by constituting the sheet by laminating 1st and 2nd layers which are different in glass transition temperature and formed of optically transparent polymers. CONSTITUTION: This plastic laminated sheet is formed by laminating the 1st layer consisting of the optically transparent polymer and the 2nd layer consisting of the optically transparent polymer which is lower in glass transition temperature than that of the 1st layer. The optically transparent polymers are >=80% in light beam transmissivity and <=5% in haze value. Polyacrylate and polycarbonate having aromatic groups in main chain are preferably used as those polymers. The glass transition temperature of the 1st layer is >=160 deg.C and preferably 180 deg.C. The glass dislocation temperature of the 2nd layer is at least 100 deg.C and is preferably >=20 deg.C higher than the glass transition temperature of the 1st layer.</p> |
