| 摘要 |
PURPOSE: To obtain a polypropylene composition comprising crystalline polypropylene as a main component and a specific rubber component, and improved in the balance between impact strength and rigidity in comparison with conventional ethylene-propylene copolymer rubber compositions. CONSTITUTION: A polypropylene composition comprises (1) 65-99wt.% of (A) crystalline polypropylene, (2) 1-35wt.% of (B) a graft copolymer rubber obtained by graft-copolymerizing (b) an unsaturated monomer to (a) an ethylene-α-olefin copolymer rubber, and (3) (C) an ethylene-α-olefin copolymer rubber and/or (D) an alkenyl aromatic compound-containing rubber in an amount of 0-50 pts.wt. per 100 pts.wt. of the total amount of the components (A) and (B).
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