C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/4919
C08L 23/16 (2006.01) C08K 3/34 (2006.01) C08L 23/10 (2006.01)
Patent
CA 2022927
A propylene polymer composition is disclosed, which comprises (A) a propylene homopolymer and/or a propylene- ethylene random copolymer containing not more than 10% by weight of ethylene as a monomer unity said homopolymer and copolymer containing not more than 5% by weight of xylene-soluble matter at 30°C, (B) an ethylene-propylene random copolymer containing 30 to 75% by weight of propylene as a monomer unit, containing not more than 5% by weight of xylene-insoluble matter at 30°C, .having a ratio of weight-average molecular weight to number-average molecular weight of more than 10 but less than 100 as measured by gel permeation chromatography, (C) an ethylene-propylene copolymer containing 15 to 40% by weight of propylene as a monomer unit and having a melt flow rate of 0.1 to 4.0 g/10 min, a melting peak temperature of not lower than 80°C as measured by differential scanning calorimeter, a crystallinity of at least 1% as measured by X-ray, diffraction method and a ratio of weight-average molecular weight to number-average molecular weight of 4 to 10 as measured by gel permeation chromatography, and (D) talc having an average particle diameter of 0.5 to 20 µm, wherein the amount of polymer component (B) is 5.0 to 40% by weight based on the total amount of polymer components (A) and (B); a polymer composition consisting of polymer components (A), (B) and (C) has an MFR of 2.0 to 100 g/10 min; the amount of polymer component (C) is 17 to 40% by weight based on the amount of the composition, and the amount of talc (D) is 3.0 to 15% by weight based on the amount of the composition.
Suda Tsutomu
Tajima Koichi
Takada Tomio
Riches Mckenzie & Herbert Llp
Showa Denko K.k.
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