Method for preparing a catalyst support for polymerising ethylene and alpha-olefins, resulting support and corresponding catalyst

摘要

This process for preparing a catalyst support for the homopolymerization or copolymerization of ethylene and alpha-olefins is characterized in that at least one organochlorine compound and a premix of at least one alkylmagnesium and of at least one organoaluminum compound chosen from aluminoxanes, aluminosiloxanes and alkylaluminums are reacted together, in the presence of at least one aliphatic diether as electron donor.