| 摘要 |
<p>A propylene polymer characterized in that (1) the content of xylene insolubles (XI) is 99.0 wt.% or above, (2) the isotactic pentad fraction (IP) is 98 % or above as measured by 13C nuclear magnetic resonance spectroscopy, (3) the average isotactic chain length (N) is 500 or above, and (4) the total content of fractions each having an average chain length (N¿f?) of 800 or above is 10 wt.% or above in the column fractionation of the xylene insolubles; a process for producing the polymer; and a propylene polymer composition comprising the above polymer and at least a nucleating agent in an amount of 0.05-15 wt.%. The invention also provides a polymerization catalyst component with which the above polymer can be produced and a process for producing the component.</p> |
