Abstract
Ternary catalyst systems for the polymerisation of 1,3-butadiene to high cis content were studied. The systems Nd(carboxylate)3/tert-butyl X /diisobutyl aluminium hydride (carboxylate=naphthenate, versatate; X=Cl, Br, I) were studied with respect to the halide:Nd ratio and halide type on catalyst activity and polymer characteristics. A lowering of the halide:Nd ratio results in lower conversions to polymer and a change in polymer molecular weight distribution. Catalyst stability is affected by halide type; instability, or tendency to precipitate, following the order I>Br>Cl. Less active catalysts (e.g. based on tert-butyl iodide) give low conversions and broad polymer MWD. Cis content remains at 98% and is unaffected by a lowering of halide:Nd ratio or a change in halide type.
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