POLYOLEFIN COMPOSITION AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a polyolefin composition which gives a polypropylene film having a low heat sealing temperature and a wide hot tack temperature range and to provide a polymer suitable as a starting material of this composition. SOLUTION: The polyolefin composition comprises 5-95 wt.% of a polypropylene and 5-95 wt.% of a propylene//propylene/olefin block copolymer, where the propylene//propylene/olefin block copolymer comprises 20-95 wt.% of a segment A comprising a polymer composed mainly of propylene obtained in the presence of a catalyst system for olefin polymerization comprising a specific supported metallocene catalyst and 80-5 wt.% of a segment B comprising a propylene/olefin random copolymer.