Patent ID: 8829128

Claim:
A process for the preparation of a polypropylene, comprising: (A) producing solid catalyst particles by: (a) preparing a solution (A) comprising: (i) a transition metal compound of formula (I): L m R n MX q (I), wherein: “M” is a transition metal of anyone of the groups 3 to 10 of the periodic table (IUPAC), each “X” is independently a monovalent anionic σ-ligand, each “L” is independently an organic ligand which coordinates to the transition metal (M), each “R” is a bridging group linking two organic ligands (L), “m” is 2 or 3, “n” is 0, 1 or 2, “q” is 1, 2 or 3, and “m”+“q” is equal to the valency of the transition metal (M), (ii) a cocatalyst (Co) comprising an element (E) of group 13 of the periodic table (IUPAC), and (iii) a solvent (A′), (b) generating an emulsion by dispersing solution (A) in a solvent (B) and in the presence of a surfactant (S), wherein: (i) solvent (B) constitutes the continuous phase of the emulsion, (ii) solution (A) constitutes in form of droplets the dispersed phase of the emulsion, (iii) the transition metal compound of formula (I) and the cocatalyst (Co) are present in the droplets, and (iv) surfactant (S) is: (α) at least one compound (SP) of formula (II), or (β) a reaction product (RP) of at least one compound (SP) of formula (II) and a compound (C) comprising an element (E) of group 13 of the periodic table (IUPAC), wherein formula (II) is: wherein R 1 is a semi-, highly- or perhalogenated hydrocarbon residue, R 2 is a residue of —C(R 3 )═C(R 3′ )—R 4 , and R 3 , R 4 , and R 3′ are independently from each other selected from the group consisting of H, C 1 to C 20 alkyl, C 2 to C 20 alkenyl, and C 2 to C 20 alkinyl, (c) solidifying said dispersed phase to convert said droplets to solid catalyst particles, and (d) recovering said solid catalyst particles; and (B) subsequently polymerizing propylene optionally with a comonomer selected from the group consisting of ethylene, a C 4 -C 20 α-olefin, and mixtures thereof, in the presence of the solid catalyst particles of step (A).