Polymerisation process and catalyst
AssigneeBorealis AG
InventorsKalle Kallio, Marja Mustonen, Lauri Huhtanen, John Severn, Pascal Castro, Ville Virkkunen, Anu-Leena Hongell, Ismo Lehtiniemi
Life of this patent
Estimating the term…
Abstract
A process for the polymerization of at least one olefin comprising reacting said at least one olefin with a catalyst comprising: (i) a metallocene complex said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier.
Claims14
A process for the polymerization of at least one olefin comprising reacting said at least one olefin with a catalyst comprising:
- (i) a metallocene complex comprising at least two cyclopentadienyl type ligands;
- (ii) a boron cocatalyst;
- and
- (iii) an aluminoxane cocatalyst;
- said catalyst being in solid form—and free from an external carrier.
A process for the preparation of a propylene and ethylene copolymer comprising copolymerizing propylene and ethylene in the presence of a catalyst comprising:
- (i)a metallocene complex of a group (IV) metal comprising at least two cyclopentadienyl type ligands;
- (ii) a boron cocatalyst;
- and
- (iii) an aluminoxane cocatalyst;
- said catalyst being in solid form and free from an external carrier;
- wherein the productivity of the process is at least 60 kg polymer/g catalyst.
A process for the preparation of a propylene and ethylene copolymer comprising copolymerizing propylene and ethylene in the presence of a catalyst comprising:
- (i)a metallocene complex of a group (IV) metal comprising at least two cyclopentadienyl type ligands;
- (ii) a boron cocatalyst;
- and
- (iii) an aluminoxane cocatalyst;
- said catalyst being in solid form and free from an external carrier;
- wherein the catalyst is obtained by a process comprising
- (a) forming a liquid/liquid emulsion system, said liquid/liquid emulsion system comprising a solution of components (i) to (iii) dispersed in a solvent so as to form dispersed droplets;
- (b) forming solid particles by solidifying said dispersed droplets;
- and
- (c) prepolymerizing the solid particles from step (b) with at least one C2-10 alpha-olefin monomer and optionally one or more different C2-C10 alpha-olefin comonomers.
Dependencies are inferred from the claim text.