| 摘要 |
<p>A cover material which is used for a container having a seal portion that is covered with a polyethylene resin. This cover material is characterized by being composed of a base material and a sealant layer, and is also characterized in that: the sealant layer has a laminate structure wherein a first thermoplastic resin layer, which is adhesive to the base material, and a second thermoplastic resin layer, which is adhesive to the seal portion that is covered with a polyethylene resin, are laminated; the thickness of the first thermoplastic resin layer and the thickness of the second thermoplastic resin layer satisfy the relation (the thickness of the first thermoplastic resin layer)≤(the thickness of the second thermoplastic resin layer); and the second thermoplastic resin layer has a dispersion structure wherein a second thermoplastic resin that is incompatible or partially compatible with a first thermoplastic resin is dispersed in the first thermoplastic resin so that the ratio of the major diameters (l) of domains of the second thermoplastic resin to the minor diameters (s) of the domains, namely l/s is within the range of 1.5≤l/s≤10.</p> |
