| 摘要 |
<p>PROBLEM TO BE SOLVED: To manufacture a highly transparent and high gloss sheet which has gas barrier properties and can be sterilized in a retort by laminating a transparent and lustrous resin layer containing a cyclic polyolefin resin, a resin layer with water vapor and gas barrier properties and a thermoplastic support resin layer. SOLUTION: A transparent and lustrous resin layer A containing a cyclic polyolefin resin, a resin layer B with water vapor barrier properties, a resin layer C with gas barrier properties and a thermoplastic support resin layer D are laminated in the order of A-B-C-D form the outer layer side to form a composite multilayer sheet. When the sheet is used as a molding, the transparent and lustrous resin layer A is set on the outer layer side. As the resin layer B with water vapor barrier properties, polypropylene, polyvinylidene chloride or high-density polyethylene is used and for the resin layer C with gas barrier properties, a vinyl alcohol or an ethylene vinly alcohol copolymer is used. These resins are laminated by a coextrusion process, a coextrusion lamination process or the like.</p> |
