Production of isotactic polystyrene

摘要

The present invention discloses the use of neutral ansa-bis(indenyl) allyl lanthanide complexes for the isospecific homo- or co-polymerisation of styrene.
A neutral ansa-bis(indenyl) allyl lanthanide complex, for the isospecific homo- or co-polymerisation of styrene, of general formula
[(lnd)R"(lnd)]Ln(allyl)(ether) n
wherein (lnd) is a substituted or unsubstituted indenyl or hydrogenated indenyl group, R" is a bridge between the 1,1'-indenyl groups imparting stereorigidity to the complex, Ln is a metal Group 3 of the Periodic Table including the lanthanide elements, allyl is an allylic group of the general formula C 3 R 5 wherein each R is the same or different and is hydrogen or alkyl group, ether is a donor solvent is claimed.