| 摘要 |
<p>A propylene/ethylene copolymer giving molded articles excellent in heat resistance and films excellent in both low-temperature heat sealability and rigidity; a process for the production thereof; and molded articles thereof. The copolymer contains 0.01 to 15 mole % of ehtylene units, and is characterized in that in the chain structure as found in the nuclear magnetic resonance spectrum, the triad fraction (PE), the triad fraction (EEE) and the numeral ratio (N¿αβ?) of α,β-methylene carbons lie within specific ranges respectively and that the weight-average molecular weight is 50,000 to 1,500,000 and the molecular weight distribution (Mw/Mn) is 1.2 to 3.8. This copolymer can be prepared by copolymerizing ethylene with propylene in the presence of a catalyst comprising a specific chiral transition metal compound (metallocene) and aluminoxane.</p> |
