Polymer Bulletin

, Volume 19, Issue 4, pp 333–338 | Cite as

Studies on propylene polymerization with a highly active MgCl2 supported TiCl4 catalyst system

  • Norio Kashiwa
  • Junichi Yoshitake
  • Akinori Toyota


Propylene polymerization was performed with a highly active MgCl supported TiCl4 in conjunction with Et3Al and ethyl benzoate (EB). The obtained polypropylene sample was separated into four fractions by successive extraction with pentane, heptane and trichloroethylene (trichlene). Yield, Mn, Tm and microtacticity of each fraction were determined, and the effects of the concentration of EB on these items of results were investigated. It has been found that EB enhances yield, Mn and stereospecificity of trichlene insoluble (the most stereospecific) fraction, and in contrast, it decreases rapidly yields of other three fractions without changing the character of the polymers. From these findings, the functions of EB to the active centers were discussed.


Polymer Ethyl Propylene MgCl Polypropylene 
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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Norio Kashiwa
    • 1
  • Junichi Yoshitake
    • 1
  • Akinori Toyota
    • 1
  1. 1.Research CenterMitsui Petrochemical Industries, Ltd.Yamaguchi-kenJapan

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