| 摘要 |
<p>POLYPROPYLENE-BASED COPOLYMER AND FILM COMPRISING TIE POLYPROPYLENE-BASED COPOLYMER A polypropylene-based copolymer containing 50 to 95% by weight of a polymer component (component A) mainly comprising the constitutional unit derived from propylene and having a melting point exceeding 155oC and 5 to 50% by weight of a copolymer component (component B) of propylene, ethylene and an having 4 or more carbon atoms in which the content (X) of the constitutional unit derived from propylene is by weight, the content (Y) of the constitutional unit derived from ethylene is by weight, the content (Z) of the constitutional unit derived from an having 4 or more carbon atoms is by weight (provided that the total of X, Y and Z is 100% by weight), and the weight ratio of the content (Z) of the constitutional unit derived from an having 4 or more carbon atoms to the content (X) of the constitutional unit derived from propylene is 1 or less.</p> |
