Patent ID: 8791042
Filing Date: 2014-07-29
Classification: C08F

Abstract:
1. 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: 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, c) solidifying said dispersed phase to convert said droplets to solid particles and d) optionally recovering said particles to obtain said catalyst system.