Catalyst containing a phosphine oxide modifier and process...

Details Catalyst containing a phosphine oxide modifier and process... Catalyst containing a phosphine oxide modifier and process...

C - Chemistry, Metallurgy

08

F

402/448, 402/469

C08F 4/52 (2006.01) C08F 4/48 (2006.01) C08F 36/04 (2006.01)

Patent

CA 1192534

Abstract A process and catalyst system is disclosed herein for the preparation of (co)polymers having a 1,2-microstructure ranging 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 and optionally other copolymerizable monomers. The catalyst system which is employed in the production of the (co)polymer is a combination of (1) an anionic initiator based on lithium; (2) a dialkyl magnesium compound or a trialkyl aluminum compound or a mixture thereof; and (3) a phosphine oxide modifier which is substituted with three saturated heterocyclic rinqs, each hetero ring containing one nitrogen atom and either four, five or six carbon atoms.

429922

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