alkyl aluminums and used as catalystssupports for nickeldiimine complexes functionalized with amine groups. These supportedcatalysts were used to polymerizeethylene in a slurry reactor. The MgCl2-based supportednickeldiiminecatalysts had higher activities than the equivalent SiO2-supported nickeldiiminecatalysts, even without the use of activators. These catalysts made polyethylene with melting