Coupled styrenic block copolymers and process for preparing same
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United States of America Patent
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Mar 7, 2006
Grant Date -
Mar 18, 2004
app pub date -
Jul 11, 2003
filing date -
Jul 11, 2002
priority date (Note) -
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Abstract
Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.
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