PROPYLENE-BASED POLYMER COMPOSITION

摘要

PROBLEM TO BE SOLVED: To obtain the subject composition controlling burning and a rise in melt flow rate, having excellent heat processing characteristics by mixing a specific propylene block copolymer with a prescribed compound. SOLUTION: This composition is obtained by compounding (A) 100 pts.wt. of a propylene block copolymer which comprises (i) a polymer block composed of a propylene homopolymer or a random copolymer of (a) propylene and (b) <=10 mol.% of a copolymerizable monomer of ethylene and/or a 4-20Cα-olefin and (ii) a polymer block composed of a random copolymer of the component (a) and 10-80 mol.% of the component (b), satisfying the equation nb <=n+1.5 (nb is the average chain length of block of the component (b); (n) is the total average chain length of the component (b)) and has 0.1-200 g/10 minutes melt flow rate with (B) 0.001-1 pt.wt. of an aromatic phosphoric ester compound and/ or a hindered phenol compound having >=50 deg.C melting point.