Patent · US Expired

Polymerization of olefins

US6506861B2 · kind B2 · utility

10Cited by

5References

9Claims

0Family size

Assignee

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

Inventors

Lin Wang · Hockessin, US
Lynda Kaye Johnson · Wilmington, US
Alex Sergey Ionkin · Kennett Square, US

Key dates

Filing date	May 31, 2001
Grant date	Jan 14, 2003
Priority date	—
Expiry date	May 31, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F210/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Olefins are polymerized by novel transition metal complexes of selected iminocarboxylate and iminoamido ligands, sometimes in the presence of cocatalysts such as alkylaluminum compounds or neutral Lewis acids. Olefins which may be (co)polymerized include ethylene, &agr;-olefins, and olefins containing polar groups such as olefinic esters for example acrylate esters. Also described are certain “Zwitterionic” transition metal complexes as polymerization catalysts for making polar copolymers. The resulting polymers are useful as thermoplastics and elastomers.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.