Polymerisation process

US9469708B2 · kind B2 · utility

Assignee

• Borealis AG · AT

Inventors

• Pascal Castro · Helsinki, FI
• Kalle Kallio · Porvoo, FI
• Laurie Huhtanen · Loviisa, FI
• Ville Virkkunen · Porvoo, FI
• Noureddine Ajellal · Helsinki, FI

Key dates

• Filing date: Oct 17, 2013
• Grant date: Oct 18, 2016
• Expiry date: Oct 17, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F4/65927
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of a propylene homopolymer comprising polymerizing propylene in the presence of a catalyst comprising: (i) a metallocene complex of a group (IV) metal 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; preferably wherein the melting point of the propylene polymer is controlled by adjusting the amount of or nature of the boron cocatalyst.