Catalyst system containing an anionic initiator based on lithium and phosphine oxide modifier
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United States of America Patent
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Oct 9, 1984
Grant Date -
N/A
app pub date -
Jul 1, 1982
filing date -
Jul 1, 1982
priority date (Note) -
Expired
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Abstract
A process and catalyst system is disclosed herein for the preparation of (co)polymers having a 1,2-microstructure of between about 20 and about 65 percent. These (co)polymers are prepared in a hydrocarbon or non-polar solvent from a monomer system which contains at least one 1,3-diene monomer. The catalyst system which is employed in the production of the (co)polymer is a combination of an anionic initiator based on lithium and a phosphine oxide modifier which is substituted with three saturated heterocyclic rings, each hetero ring containing one nitrogen atom and either four, five or six carbon atoms.
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