| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a propylene copolymer and its production method excellent in low temperature heat sealability and rigidity, having practical transparency, and to provide a film composed of the propylene copolymer. SOLUTION: This propylene copolymer is characterized to be obtained by polymerizing 1-30 wt.% copolymer component (A) comprising propylene, 5 mol% or less ethylene and/or 1 less than 15 mol% 4 or more Cα-olefin at the first process and then, polymerizing 70-99 wt.% copolymer component (B) comprising propylene, 5 mol% or less ethylene and 15-30 mol% 4 or more Cα-olefin after the second process. The production method of the copolymer and a film composed of the copolymer are also provided.</p> |
