Continuous addition of tin halides to solution SBR
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United States of America Patent
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Nov 6, 2001
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N/A
app pub date -
Jun 3, 1999
filing date -
Jun 3, 1999
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Abstract
A method of continuously polymerizing a conjugated diene monomer and a vinyl aromatic hydrocarbon monomer in a hydrocarbon solvent by using an organolithium initiator, adding to the polymerization mixture a tin compound and again adding a tin compound after the polymerization mixture has been withdrawn from the polymerization vessel. The resulting diene polymers possess a significantly reduced Payne Effect and a substantial reduction (over 10%) in tan delta at 50.degree. C. which results in tires having decreased hysteresis loss, excellent wear resistance and rolling resistance and good wet skid resistance.
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