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:
Apr. 03, 2007
Filed:
Nov. 23, 2005
Adel Farhan Halasa, Bath, OH (US);
Wen-liang Hsu, Cuyahoga Falls, OH (US);
Aaron Michael Ryba, Akron, OH (US);
Jin-ping Zhou, Bartlesville, OK (US);
Chad Aaron Jasiunas, Copley, OH (US);
Paul Harry Sandstrom, Cuyahoga Falls, OH (US);
Adel Farhan Halasa, Bath, OH (US);
Wen-Liang Hsu, Cuyahoga Falls, OH (US);
Aaron Michael Ryba, Akron, OH (US);
Jin-Ping Zhou, Bartlesville, OK (US);
Chad Aaron Jasiunas, Copley, OH (US);
Paul Harry Sandstrom, Cuyahoga Falls, OH (US);
The Goodyear Tire & Rubber Company, Akron, OH (US);
Abstract
The neodymium catalyst system prepared by the technique of this invention can be used in the polymerization of isoprene monomer into synthetic polyisoprene rubber having an extremely high cis-microstructure content and high stereo regularity. This polyisoprene rubber will crystallize under strain and can be compounded into rubber formulations in a manner similar to natural rubber. This invention more specifically discloses a process for the synthesis of polyisoprene rubber which comprises polymerizing isoprene monomer in the presence of a neodymium catalyst system, wherein the neodymium catalyst system is prepared by a process that comprises (1) reacting a neodymium carboxylate with an organoaluminum compound in an organic solvent to produce neodymium-aluminum catalyst component, and (2) subsequently reacting the neodymium-aluminum catalyst component with an elemental halogen to produce the neodymium catalyst system, wherein the neodymium catalyst system is void of nickel-containing compounds.