| 摘要 |
PURPOSE: To obtain the subject composition comprising a propylene block copolymer having specific physical properties, a polyolefinic resin, and an inorganic filler, excellent in the balance between rigidity and impact resistance, and useful for electric parts, electronic parts, etc. CONSTITUTION: This composition comprises (A) 45-70wt.% of a propylene block copolymer comprising (i) 50-97wt.% of a polypropylene part satisfying a xylene- insoluble content of 98.0wt.% at 25 deg.C, an isotactic pendant fraction of 96.5%, an isotactic pendant average chain length of >=90, etc., and (ii) 50-3wt.% of a propylene-ethylene and/or 4-12Cα-olefin copolymer satisfying an average propylene content of 20-80mol.% by a two site model, a blocking property of 1.8-5.0, etc., (B) 5-20 wt.% of a polyolefin resin satisfying a crystal structure exhibiting an a-axial configuration by a X-ray diffraction method, etc., (C) 5-30wt.% of an inorganic filler such as precipitated calcium carbonate, and (D) 5-30wt.% of an inorganic filler such as talc or mica, (the total amount of the components A-D is 100wt.%). |
