Patent ID: 7199201
Filing Date: 2007-04-03
Classification: B01J,B60C,C08F,C08L

Abstract:
1. A process for the synthesis of polyisoprene rubber which comprises polymerizing isoprene monomer into the polyisoprene rubber in the presence of a neodymium catalyst system, wherein the isoprene monomer is polymerized in a batch process, 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.