Catalysts for olefin polymerization

US6897275B2 · kind B2 · utility

Assignee

• E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

• Lin Wang · Hockessin, US
• Elisabeth Hauptman · Wilmington, US
• Lynda Kaye Johnson · Wilmington, US
• Elizabeth Forrester McCord · Hockessin, US
• Ying Wang · Wilmington, US
• Steven Dale Ittel · Wilmington, US

Key dates

• Filing date: May 31, 2001
• Grant date: May 24, 2005
• Expiry date: Dec 12, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F210/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Transition metal complexes of selected monoanionic phosphine ligands, which also contain a selected Group 15 or 16 (IUPAC) element and which are coordinated to a Group 3 to 11 (IUPAC) transition metal or a lanthanide metal, are polymerization catalysts for the (co)polymerization of olefins such as ethylene and α-olefins, and the copolymerization of such olefins with polar group-containing olefins. These and other nickel complexes of neutral and monoanionic bidentate ligands copolymerize ethylene and polar comonomers, especially acrylates, at relatively high ethylene pressures and surprisingly high temperatures, and give good incorporation of the polar comonomers and good polymer productivity. These copolymers are often unique structures, which are described.