Journal of Polymer Science Part A: Polymer Chemistry, Vol.40, No.18, 3112-3119, 2002
Novel spherical Ziegler-Natta catalyst for polymerization and copolymerization. I. Spherical MgCl2 support
Spherical MgCl2 adducts used as supports for a Ziegler-Natta catalyst for olefin polymerization were prepared by the general precipitation method. The influence of MgCl2/EtOH (mol/mol) and the dispersion speeds on the particle size (PS) and particle size distribution (PSD) were investigated. It was found that the former played a trivial role in controlling the PS and PSD, and the latter was the key factor. In particular, the influence of ethanol on the crystal structure was further examined, with consideration given to the performance of the supported Ziegler-Natta catalyst. It was believed that the reactions between MgCl2 and ethanol had a controlling effect on the destruction of the original anhydrous MgCl2 which was the key point in the preparation of suitable supports for the latest generation Ziegler-Natta catalyst.