Bulk polymerization of conjugated dienes using a nickel-based catalyst system
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United States of America Patent
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Jan 17, 2017
Grant Date -
Oct 17, 2013
app pub date -
Dec 30, 2011
filing date -
Dec 31, 2010
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Abstract
A process for preparing a polydiene, the process comprising the steps of (i) providing conjugated diene monomer; (ii) charging a nickel-based catalyst system to the conjugated diene monomer; and (iii) charging a modulating Lewis base to the conjugated diene monomer, to thereby polymerize the conjugated diene monomer in the presence of the modulating Lewis base, where said step of charging a modulating Lewis base is separate from said step of charging a nickel-based catalyst, and where said steps of providing conjugated diene monomer, charging a nickel-based catalyst system and charging a Lewis base form a polymerization mixture that includes less than 20% by weight of organic solvent based on the total weight of the polymerization mixture.
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