New synthesis of a highly active δ-MgCl2 for MgCl2/TiCl4/AlEt3 catalytic systems

✍ Scribed by Vito Di Noto; Silvano Bresadola

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 442 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021971126

✦ Synopsis

Abstract

A good supporting material for Ziegler‐Natta type catalysts was obtained by reaction between powdered metallic magnesium and 1‐chloro‐n‐C~m~H~2__m__+1~ (m = 3–9). This reaction affords a highly disordered form of MgCl~2~ which was characterized by FT‐IR spectroscopy and powder X‐ray diffraction (XRD) analysis. This MgCl~2~ form shows a crystallographic disorder much higher than that exhibited by the products obtained following the commercial activation procedures of α‐MgCl~2~, either mechanical or chemical. As shown by the XRD spectra, the synthetized MgCl~2~ is characterized by the typical structure of the δ‐form. Therefore, this MgCl~2~ form, in view of its highly disordered structure, appears as a promising material for the preparation of active supported Ziegler‐Natta type catalysts. Thus, by titanation of the obtained δ‐MgCl~2~ we have prepared some supported catalysts which have been tested in the slurry propene polymerizations, showing high activity (136000–138000 gPP/gTi) and good stereoselectivity (82–88% I.I.).