Increased throughput in the manufacture of anionic

专利名称：Increased throughput in the manufacture of

anionic polymers by reduction in polymersby reduction in polymer cement viscositythrough the addition of metal alkyls

发明人：Carl Lesley Willis,Robert Charles

Bening,Peter Taylor Murany,Steven JonWeddle,Dale Lee Handlin, Jr.

申请号：US10106265申请日：20020326公开号：US06492469B2公开日：20021210

摘要：The present invention is an improvement upon the known method of anionicallypolymerizing monomers by contacting the monomers with an anionic polymerizationinitiator which is an organo-substituted alkali metal compound. The improvementcomprises decreasing the viscosity of the polymer cement by adding at least 0.01equivalent of a metal alkyl compound per equivalent of alkali metal initiator if the metalalkyl is added before or at the beginning of polymerization. If the metal alkyl is addedduring the polymerization or after but before the living polymer is terminated, then atleast 0.01 equivalent of the metal alkyl compound per equivalent of living polymer chainends is should be used. The alkyl groups of the metal alkyl are chosen such that they donot exchange with the organo substituents of the alkali metal, which can be the livingpolymer chain ends or the organo substituents of the initiator. To avoid this undesiredexchange reaction, the alkyl groups of the metal alkyl compound are selected to be

more basic and/or less bulky or both than the organo substituents of the alkali metalcompound.

申请人：KRATON POLYMERS U.S. LLC

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