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A comparison of Cp2HfCl2 versus Cp2ZrCl2 methylalumoxane catalysts

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Summary

Ethylene polymerizations by Cp2ZrCl2/MAO (MAO=methyl-alumoxane) and Cp2HfCl2/MAO catalysts are compared. The Hf catalysts have about two-thirds the activity of the Zr catalysts. This difference may be attributed to the greater number of active centers present in the Zr catalyst. The Hf catalyst shows a smaller dependence of: (1) polymer MW on temperature and (2) polymerization activity on transition metal concentration than the Zr catalyst.

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Authors and Affiliations

  1. Departments of Chemistry and Polymer Science and Engineering, University of Massachusetts, 01003, Amherst, MA, USA

    Daniel T. Mallin, Marvin D. Rausch & James C. W. Chien

Authors
  1. Daniel T. Mallin
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  2. Marvin D. Rausch
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  3. James C. W. Chien
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Additional information

We are grateful to the Fina Oil and Chemical Company for support of this research program, and to Dr. John Ewen for helpful suggestions.

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Mallin, D.T., Rausch, M.D. & Chien, J.C.W. A comparison of Cp2HfCl2 versus Cp2ZrCl2 methylalumoxane catalysts. Polymer Bulletin 20, 421–425 (1988). https://doi.org/10.1007/BF01153432

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  • DOI: https://doi.org/10.1007/BF01153432

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