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:
Jun. 21, 2005
Filed:
Apr. 16, 2002
Barbara M. Tsuie, West Chester, OH (US);
Karen L. Neal-hawkins, Cincinnati, OH (US);
Sandor Nagy, Naperville, IL (US);
Michael W. Lynch, West Chester, OH (US);
Mark P. Mack, West Chester, OH (US);
Shaotian Wang, Mason, OH (US);
Jean a Merrick-mack, West Chester, OH (US);
Clifford C. Lee, Cincinnati, OH (US);
Joel A. Mutchler, Morris, IL (US);
Kenneth W. Johnson, West Chester, OH (US);
Barbara M. Tsuie, West Chester, OH (US);
Karen L. Neal-Hawkins, Cincinnati, OH (US);
Sandor Nagy, Naperville, IL (US);
Michael W. Lynch, West Chester, OH (US);
Mark P. Mack, West Chester, OH (US);
Shaotian Wang, Mason, OH (US);
Jean A Merrick-Mack, West Chester, OH (US);
Clifford C. Lee, Cincinnati, OH (US);
Joel A. Mutchler, Morris, IL (US);
Kenneth W. Johnson, West Chester, OH (US);
Equistar Chemicals, LP, Houston, TX (US);
Abstract
A method for making ethylene polymers and copolymers is disclosed. The method uses a catalyst system comprising a low level of an aluminum-containing activator, a bridged indenoindolyl transition metal complex, and a treated silica support. The method enables economical preparation of ethylene copolymers having very low density. The silica-supported, bridged complexes incorporate comonomers efficiently and are valuable for a commercial slurry loop process. Use of a bridged indeno[2,1-b]indolyl complex provides exceptionally efficient comonomer incorporation, and gives polymers with a substantial and controlled level of long-chain branching. The method facilitates the production of a wide variety of polyolefins, from HDPE to plastomers.