| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sealant film for the cap material of a polypropylene container that has both appropriate sealing strength and easily opening property and interfacially delaminates. <P>SOLUTION: The sealant film for the cap material of the polypropylene container is composed of at least (a) a layer consisting of a mixture of 40-60 mass% of the ethylene-maleic anhydride-methyl acrylate copolymer, 5 mass%-15 mass% of propylene-butene copolymer, and 20 mass%-55 mass% of straight-chain low-density polyethylene polymerized using single-site catalyst, and (b) a layer consisting of a mixture of 60-90 mass% of polypropylene and 40-10 mass% of high-density polyethylene, wherein, the melt flow rates of the ethylene-maleic anhydride-methyl acrylate copolymer, the propylene-butene copolymer, and the straight-chain low-density polyethylene are 5-25 g/10 min, 5-10 g/10 min, and 1-10 g/10 min, respectively, and the density of the straight-chain low-density polyethylene is 0.900-0.930. <P>COPYRIGHT: (C)2009,JPO&INPIT |
