Supports of type MgCl2/AlRn(OEt)3-n, obtained by reaction of AlR3 with adducts of MgCl2 and ethanol, have been shown to be effective for the immobilization and activation of [Cp2TiCl2] and other single-site olefin polymerization catalysts without the use of methylaluminoxane or a borate activator. Polyethylene with a spherical particle morphology and narrow molecular weight distribution was obtained.
Severn, J. R., & Chadwick, J. C. (2004). MAO-free activation of metallocenes and other single-site catalysts for ethylene polymerization using spherical supports based on MgCl2. Macromolecular Rapid Communications, 25(10), 1024-1028. https://doi.org/10.1002/marc.200400093