Uniform initiation of anionic polymerization using organo-substituted alkali metal initiators

  • US 6,455,651 B1
  • Filed: 03/14/2000
  • Issued: 09/24/2002
  • Est. Priority Date: 04/23/1999
  • Status: Expired due to Term
First Claim
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1. In a method of anionically polymerizing monomers comprising contacting the monomers with a functional anionic polymerization initiator which is an organo-substituted alkali metal compound, the improvement which comprises adding from 0.1 to 1.0 equivalents of a metal alkyl compound per equivalent of the alkali metal compound 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 and wherein the organo substitution of the alkali metal compound is aliphatic, cycloaliphatic, aromatic, or alkyl-substituted aromatic.

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