Method for Preparing an Olefin Polymerization Catalyst Composition

A method for preparing a storable fluidic olefin polymerization catalyst composition, said catalyst comprising an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC), or of an actinide or lanthanide, said method comprising:

• (a) forming a liquid/liquid emulsion system, which contains a homogeneous solution of a catalyst system, said solution being dispersed in a solvent immiscible therewith and forming the dispersed phase of the liquid/liquid emulsion system,
• (b) solidifying said dispersed droplets to form solid catalyst particles having a predetermined size range,
• (c) removing the immiscible solvent from the reaction mixture in order to obtain said solid catalyst particles;
• (d) adding a fluidic isolation medium to the solid catalyst particles, said isolation medium being inert with respect to the catalyst particles and under the conditions of the olefin polymerization, and stirring the mixture, to obtain a storable fluidic olefin polymerization catalyst composition.