| 摘要 |
A cover material used for a container has a seal part formed from a polypropylene resin. The cover material includes a base material and a sealant layer. The sealant layer has a laminated structure obtained through lamination of a first thermoplastic resin layer, adhesive to the base material, and a second thermoplastic resin layer, adhesive to the seal part formed from the polypropylene resin. Thicknesses of the first thermoplastic resin layer and the second thermoplastic resin layer satisfy: thickness of first thermoplastic resin layer≦̸thickness of second thermoplastic resin layer. The layer of the second thermoplastic resin has a dispersion structure obtained by dispersing, in the first thermoplastic resin, the second thermoplastic resin that is non-compatible or partially compatible to the first thermoplastic resin such that a ratio l/s of a domain longer diameter l and a domain shorter diameter s of the second thermoplastic resin is within 1.5≦̸l/s≦̸10. |
