The Impact of the Cocatalyst on the Polymerisation Behaviour of Supported Metallocenes

Recently a new supported metallocene catalyst system for the propylene polymerisation has been developed. For the activation of the catalyst common aluminium alkyls are necessary. The use of the cocatalysts has a great impact on the whole polymerisation behaviour. The aluminium alkyls effect the activation, the deactivation and the kinetic profile as well as the polymer properties of the resulting polypropylene.The formation of a new kind of soluble MAO free metallocene catalyst as a result of the complex extraction from the catalyst particles by the cocatalyst has been assumed.