Polypropylene-based resin composition, molded article thereof, and automobile interior or exterior material using the same

摘要

There are provided a polypropylene-based resin composition having excellent impact resistance, tensile elongation at break and rigidity, a molded article thereof, and an automobile interior or exterior material using the same. The polypropylene-based resin composition contains 50 to 90% by mass of a polypropylene-based polymer (A), 5 to 50% by mass of an ethylene-α-olefin copolymer rubber (B), and 0.1 to 5% by mass of a copolymer (C) primarily comprising a vinyl aromatic monomer unit and an alkylene monomer unit, wherein a content of an α-olefin monomer unit in all alkylene monomers is 45 mol % or more.

主权项

1. A polypropylene-based resin composition comprising:
50 to 90% by mass of a polypropylene-based polymer (A); 5 to 50% by mass of an ethylene-α-olefin copolymer rubber (B); 0.1 to 5% by mass of a copolymer (C) primarily comprising a vinyl aromatic monomer unit and an alkylene monomer unit, wherein a content of an α-olefin monomer unit in all alkylene monomers in copolymer (C) is 45 mol % or more; and 2 to 30% by mass of a copolymer (D) comprising two or more polymer blocks primarily comprising a vinyl aromatic monomer unit as the block structure of the (D) copolymer, wherein copolymer (D) further comprises an alkylene monomer unit, wherein a content of an α-olefin monomer unit in all alkylene monomers of the copolymer (D) is less than 45 mol %, wherein the (C) copolymer is a hydrogenated copolymer primarily comprising a vinyl aromatic monomer unit and a conjugated diene monomer unit; and an average vinyl bond content in all conjugated diene units contained before hydrogenation is 62 mol % or more, and wherein a mass ratio ((C)/(D)) of the (C) component to the (D) component is 1/2 or less.