Synthetic polyisoprene rubber

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 an...

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Bibliographic Details
Main Authors HSU WEN-LIANG, ZHOU JIN-PING, HALASA ADEL F, RYBA AARON M, SANDSTROM PAUL H, JASIUNAS CHAD A
Format Patent
LanguageEnglish
Published 23.06.2005
Edition7
Subjects
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
DEVICES OR ARRANGEMENTS RELATED TO TYRES
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL
THEIR PREPARATION OR CHEMICAL WORKING-UP
THEIR RELEVANT APPARATUS
TRANSPORTING
TYRE CHANGING OR REPAIRING
TYRE INFLATION
VEHICLE TYRES
VEHICLES IN GENERAL
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Summary: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 preparing a neodymium catalyst system which 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. The present invention further discloses a synthetic polyisoprene rubber which is comprised of repeat units that are derived from isoprene, wherein the synthetic polyisoprene rubber has a cis-microstructure content which is within the range of 98.0% to 99.5%, a 3,4-microstructure content which is within the range of 0.5% to 2.0%, and a trans-microstructure content which is within the range of 0.0% to 0.5%.
Bibliography:Application Number: US20040942517