| abstract |
Organo-metallic composition without boron, comprisingnan extensively fluorinated organic compound, stable tonthe air, having a di-unsaturated cycle with five or sixncarbon atoms, and an alkyl derivative of magnesium or,npreferably, of aluminum. Said composition can be usednas activator of a metallocene complex of group 4 of thenperiodic table of elements to form a catalyst with anhigh activity and low metal content for the polymerizationnof α-olefins. |