| 摘要 |
<p>PURPOSE:To obtain a multilayer sheet excellent in gas barrier properties and stiffness, favorable in deep drawability and useful as a blank material for various containers by specifying the thickness of each of a sheath layer, a core layer and an adhesive layer. CONSTITUTION:A multilayer plastic sheet with gas barrier properties comprises a sheath layer comprising polyethylene terephthalate or a thermoplastic polyester containing at least 80mol% of ethylene terephthalate units, a core layer comprising an amorphous polyamide resin having isophthalic acid as an acid component and hexamethylenediamine as an amine component, and a modified polyolefin adhesive layer. The thickness of the sheath layer is 70-98%, the thickness of the core layer is 1-15%, and the thickness of the adhesive layer is 1-15%, all percentages being based on the total thickness of the plastic sheet. When the thickness of the core layer is less than 1% based on the total thickness, the gas barrier properties obtained are poor, whereas a core layer with thickness of more than 15% leads to a problem as to deep drawability. When the thickness of the adhesive layer is less than 1% based on the total (thickness, bonding strength is poor, whereas an adhesive layer thickness of more than 15% is unfavorable from an economical point of view.</p> |
