Polypropylene resin composition

Details Polypropylene resin composition Polypropylene resin composition

C - Chemistry, Metallurgy

08

L

C08L 53/00 (2006.01) C08L 23/14 (2006.01)

Patent

CA 2191637

A polypropylene resin composition comprising the following components (A), (B), (C) and (D): (A) a crystalline ethylene-propylene block copolymer containing a room- temperature-p-xylene-soluble fraction A c having an ethylene content of 12-26% by weight and an intrinsic viscosity (measured at 135°C in decalin) of 6 dl/g or more, (B) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction B c having an ethylene content of 27-50% by weight and an intrinsic viscosity (measured at 135°C in decalin) of 4 dl/g or less, (C) an ethylene-.alpha.-olefin copolymer obtained by polymerization using a single-site catalyst, having a molecular weight distribution (Mw/Mn) of 2.5 or less, a melt flow ratio ( MI10/MI2.16 ) of 6-15 ( wherein MI10 is a melt index measured at 190°C under a load of 10kg and MI2.16 is a melt index measured at 190°C under a load of 2.16kg) and an .alpha.-olefin proportion of 70 mole % or less, and (D) a talc having an average particle diameter of 3-7 µm as measured by laser diffraction. In the composition the weight ratios A s and B s of the room- temperature-p-xylene-soluble fractions A c and B c to the total weight of the components (A) and (B) satisfy the following formulas (1) and (2): A s + B s = 7-15% by weight (1) A s/(A s + B s) = 0.1-0.6 (2) The polypropylene component contained in each of the components (A) and (B) has an isotactic pentad fraction (mmmm) of 96% or more, and the mixture of the components (A) and (B) has a melt flow rate (measured at 230°C under a load of 2,160 g) of 30-70 g/10-min, the total content of the components (A) and (B) is 50-80% by weight, the content of the component (C) is 5-20% by weight, and the content of the component (D) is 15-30% by weight, and the composition comprising the components (A), (B), (C) and (D) has a melt flow rate (measured at 230°C under a load of 2,160 g) of 25 g/10-min or more. The composition is superior in stiffness, resistance to heat deformation, impact resistance and moldability and can provide a molded article of good appearance.

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