Patent ID: 8791042

Claim:
Process for the preparation of an unsupported, heterogeneous olefin polymerization catalyst system, comprising an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC 2007) in the form of solid particles comprising the steps of: a) preparing a solution (A) comprising: a 1 ) an organometallic compound of a transition metal of Group 3 to 10 of the Periodic Table (IUPAC 2007) or of an actinide or lanthanide, a 2 ) a cocatalyst comprising an element of group 13 of the Periodic Table (IUPAC 2007) and a 3 ) a solvent (A-1), b) preparing a liquid/liquid emulsion system by dispersing the solution (A) in a solvent (B) essentially immiscible with said solution (A) in the presence of a polystyrene-b-(fluoro polystyrene) copolymer of the formula (I): in which n is a number from 10 to 100, m is a number from 1 to 40, x is a number from 5 to 16, y is a number from 11 to 33, provided that m, n, x and y are selected in a way that the polystyrene-b-(fluoro polystyrene) copolymer is soluble in the solvent B or the solution A in such an extent that a stable emulsion is formed by adding the polystyrene-b-(fluoro polystyrene) copolymer, b 1 ) the solvent (B) constitutes the continuous phase of the emulsion, b 2 ) the solution (A) constitutes in the form of droplets in the dispersed phase and b 3 ) the organometallic compound and the cocatalyst are present in the droplets, c) solidifying said dispersed phase to convert said droplets to solid particles and d) optionally recovering said particles to obtain said catalyst system.