| 摘要 |
PURPOSE:To obtain the title composition markedly excellent in rigidity and high-temperature rigidity, by mixing a crystalline ethylene/propylene block copolymer having a specified isotactic pentad fraction with a specified Al salt of a cyclic phosphorus compound. CONSTITUTION:The title composition prepared by mixing 100pts.wt. crystalline ethylene/propylene block copolymer of an ethylene content of 3-20wt.%, based on the entire polymer, prepared by polymerizing 30-5wt.%, based on the entire polymer, ethylene or both of ethylene and propylene in at least one stage in the presence of 70-95wt.%, based on the entire polymer, first-stage polymer [a propylene homopolymer satisfying the relationship: 1.00>=P>=0.015 logMFR +0.955 (wherein P is the isotactic pentad fraction and MFR is a melt flow rate which is an amount of a molten resin discharged for 10min at 230 deg.C under a load of 2.16kg)] with 0.01-1pt.wt. Al salt of a cyclic phosphorus compound of the formula (wherein R1-R8 are each H, a 1-8C alkyl, cycloalkyl, aryl or aralkyl). This composition can give a molding markedly excellent in rigidity and high-temperature rigidity.
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