The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2010
Filed:
Apr. 30, 2008
Linda N. Winslow, Cincinnati, OH (US);
Sebastian Joseph, Mason, OH (US);
Sandor Nagy, Naperville, IL (US);
Natalia Nagy, Naperville, IL (US);
Barbara M. Tsuie, Cincinnati, OH (US);
Charles H. Gates, Lake Jackson, TX (US);
Linda N. Winslow, Cincinnati, OH (US);
Sebastian Joseph, Mason, OH (US);
Sandor Nagy, Naperville, IL (US);
Natalia Nagy, Naperville, IL (US);
Barbara M. Tsuie, Cincinnati, OH (US);
Charles H. Gates, Lake Jackson, TX (US);
Equistar Chemicals, LP, Houston, TX (US);
Abstract
A slurry process for polymerizing ethylene is disclosed. The process comprises polymerizing ethylene in a first reactor in the presence of hydrogen and a catalyst comprising an activator and a supported dimethylsilyl-bridged indeno[1,2-b]indolyl zirconium complex to produce an ethylene homopolymer, removing some of the unreacted hydrogen, and reacting the homopolymer slurry in a second reactor with ethylene and a C-Cα-olefin to produce polyethylene. The polyethylene has weight-average molecular weight greater than 150,000, broad molecular weight distribution, low long-chain branching, and it provides pipes or molded articles with good environmental stress crack resistance.