Polyolefin production

US6894132B2 · kind B2 · utility

Assignee

• ATOFINA Research S.A. · BE

Inventor

• Abbas Razavi · Mons, BE

Key dates

• Filing date: Jun 26, 2003
• Grant date: May 17, 2005
• Expiry date: Nov 7, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F110/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Provided is a catalyst for the polymerization of olefins of general formula:R″(C4R′mC5C4R′n)XMeQwherein X is an hetero-atom ligand with one or two lone pair electrons selected from the elements of Group VA or VIA which can be substituted or non-substituted: (C4Rm′C5C4Rn′) is a symmetrically substituted, 3,6-substituted fluorenyl; R′ is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, a halogen, an alkoxy, an alkoxy alkyl or an alkylamino or alkylsilylo radical, each R′ may be the same or different and m and n independently are 1, 2 3 or 4, with the proviso that the bilateral symmetry is maintained; R″ is a structural bridge between X and the (C4R′mC5C4R′n) ring to impart stereorigidity; Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IIIB, IVB, VB, or VIB metal as positioned in the Periodic Table of Elements; and Me can be in any of its theoretically possible oxidation states.Also provided are olefin monomers (particularly propylene) polymerized using these catalysts to form syndiotactic/atactic block polymers of high molecular weight and comprising at least 70% of syndiotactic triads.