Uniform initiation of anionic polymerization using organo-substituted alkali metal initiators
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United States of America Patent
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Sep 24, 2002
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N/A
app pub date -
Mar 14, 2000
filing date -
Apr 23, 1999
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Abstract
The present invention is an improvement in a method of anionically polymerizing monomers by contacting them with an anionic polymerization initiator which is an organo-substituted alkali metal compound in the presence of low amounts of an accelerator/promoter and/or a highly active microstructure modifier. The improvement comprises adding from 0.1 to 1.0 equivalents of a metal alkyl compound per equivalent of alkali metal initiator wherein alkyl groups of the metal alkyl compound are chosen so that they will not exchange with the organo substituents of the alkali metal compound. The preferred initiator for use herein is the sec-butyl lithium adduct of diisopropenyl benzene and the preferred metal alkyl is triethyl aluminum.
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