| 摘要 |
PURPOSE:To obtain a highly heat-resistant and rigid composition of improved surface gloss and elongation in tensile testing, by incorporating an inorganic filler of a specific size in a specific propylene-ethylene block copolymer. CONSTITUTION:The objective composition can be obtained by incorporating (A) 65-85wt% of a propylene-ethylene block copolymer having an intrinsic viscosity of 1.7-2.5dl/g (measured in the form of tetralin solution at 135 deg.C) and an ethylene content of 5-13wt%, with the propylene-polymerized portion having an intrinsic viscosity of 1.60-1.75dl/g (measured under the same condition as men- tioned above) and the ethylene content in the propylene-ethylene-copolymerized portion of 25-40wt% with (B) 15-35wt% of an inorganic filler pref. talc or a mixture of talc and calcium carbonate, having an average particle size <=4.0mu.
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