Heteroleptic alkaline-earth metal compounds and methods for carrying out stereoselective anionic polymerization

US6399727B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Konrad Knoll · Mannheim, DE
• Hans-Herbert Brintzinger · Frauenfeld, CH
• Sjoerd Harder · Konstanz, DE
• Armin Weeber · Markdorf, DE
• Florian Feil · Konstanz, DE

Key dates

• Filing date: Aug 21, 2001
• Grant date: Jun 4, 2002
• Expiry date: Aug 21, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F36/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymerization initiator comprising an alkaline earth metal compound chosen from the groupa) of heteroleptic alkaline earth metal compounds of the formula IL—M—R  (I) orb) of cationic alkaline earth metal complexes of the formula II[D→M—R]+X−  (II), whereM: is Ca, Sr or Ba,L: is a polymerization-inactive ligand,R: is a polymerization-active ligand,D: is a donor ligand, andX: is a non-coordinating anion,and processes for the preparation of the polymerization initiators and processes for anionic polymerization in the presence of the polymerization initiators.