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Advances in Propylene Polymerization with MgCl2 Supported Catalysts

  • E. Albizzati
  • U. Giannini
  • G. Morini
  • C. A. Smith
  • R. C. Zeigler

Abstract

The role of Lewis bases in MgCl2 supported catalysts for polypropylene has been reviewed. Experimental data strongly support the hypothesis that the Lewis base competes with TiCl4 for selective coordination on unsaturated Mg ions located on different faces of MgCl2. The choice of chelating Lewis bases particularly able to complex tetracoordinate Mg ions located on (110) face and unable to give secondary reactions with the cocatalyst AIR3, has allowed the preparation of highly active catalysts that give high stereospecificity even in the absence of external donors. Solid state 13C NMR shows that in the catalyst, various Lewis bases are coordinated to MgCl2 rather than Ti, in good agreement with the results from I.R. spectroscopy.

Keywords

Catalyst System Phthalic Acid Lewis Base Isotactic Polypropylene External Donor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • E. Albizzati
    • 1
  • U. Giannini
    • 1
  • G. Morini
    • 1
  • C. A. Smith
    • 2
  • R. C. Zeigler
    • 2
  1. 1.HIMONT “G. Natta” Research Center P.le G. DoneganiFerraraItaly
  2. 2.HIMONT R&DCElktonUSA

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