Get access

Dual-Active-Site Nature of Magnesium Dichloride-Supported Cyclopentadienyl Titanium Chloride Catalysts Switched by an Activator in Propylene Polymerization

Authors

  • Keisuke Goto,

    1. School of Materials Science, Japan Advance Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
    Search for more papers by this author
  • Toshiaki Taniike,

    1. School of Materials Science, Japan Advance Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
    Search for more papers by this author
  • Minoru Terano

    Corresponding author
    1. School of Materials Science, Japan Advance Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
    • School of Materials Science, Japan Advance Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan.
    Search for more papers by this author

Abstract

MgCl2-supported metallocene catalysts often show peculiar catalytic aspects, which are partially similar to both non-supported complexes and traditional Ziegler–Natta catalysts. In this study, the active-site natures of various MgCl2-supported cyclopentadienyl Ti chloride catalysts are systematically investigated and compared with traditional catalysts in propylene polymerization. The supported titanocene catalysts offer both metallocene-type and Ziegler–Natta-type active-site natures according to the details of the preparation and the activation procedures. The observed dual-active-site natures are plausibly correlated with the valence and charge states of the Ti center.

original image
Get access to the full text of this article

Ancillary