| abstract |
Process for the preparation of a solid olefin polymerisation 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 nI) generating an emulsion by dispersing a liquid clathrate in a solvent (S) wherein n(i) the solvent (S) constitutes the continuous phase of the emulsion and comprises a nonreactive fluorinated synthetic oil having a viscosity at 20°C according to ASTM D445of at least 10 cSt up to 2000 cSt n(ii) the liquid clathrate constitutes in form of droplets the dispersed phase of the emulsion, n nII) solidifying said dispersed phase to convert said droplets to solid particles and nIII) optionally recovering said particles to obtain said catalyst system, nwherein the liquid clathrate comprises n(a) a lattice being the reaction product of n na1) a transition metal compound of formula (I) n n L m R n TX q (I) n nwherein n"T" is a transition metal of anyone of the groups 3 to 10 of the periodic table (IUPAC 2007), preferably a transition metal of anyone of the groups 4 to 6 of the periodic table (IUPAC 2007), more preferably titanium (Ti), zirconium (Zr) or hafnium (Hf), i.e. zirconium (Zr) or hafnium (Hf), neach "X" is independently a monovalent σ-ligand, neach "L" is independently an organic ligand which coordinates to the transition metal (T), n"R" is a bridging group linking said organic ligands (L), n"m" is 2 or 3, preferably 2, n"n" is 0, 1 or 2, preferably 1, n"q" is 1, 2 or 3, preferably 2, nm+q is equal to the valency of the transition metal (T), na2) a cocatalyst comprising aluminoxane na 3 ) a compound being effective to form the lattice with the transition metal compound and/or the aluminoxane and n n(b) a hydrocarbon solvent (HS). |