Patent · US Expired

Processes for preparing polyethylene catalysts by heating catalyst precursors

US4719193A · kind A · utility

51Cited by
15References
12Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 30, 1986
Grant dateJan 12, 1988
Priority date—
Expiry dateSep 30, 2006

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC08F10/02
  • WIPO fieldMacromolecular chemistry, polymers
  • WIPO sectorChemistry

Abstract

Ethylene polymers are obtained in enhanced yield in a process for homopolymerizing ethylene or copolymerizing ethylene with an alpha-olefin having 3 to 8 carbon atoms employing a catalyst system comprising (a) a solid titanium (III)-containing precursor, and (b) an organoaluminum activator, by heating the titanium (III)-containing precursor, prior to activating with the organoaluminum activator, at a temperature of 140.degree.-200.degree. C. for a sufficient time to reduce the electron donor level of the precursor from at least about 20 percent to about 80 percent over the electron donor level achieved by drying to constant weight.

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