Method for preparing polybutadiene endowed with improved processability characteristics
AssigneeEnichem Elastomeri S.r.l.
InventorsPiero Andreussi, Renzo Bianchi, Mario Bruzzone
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Abstract
The processability of a polybutadiene with a high content of 1,4-cis-structure is improved by means of the addition of PCl.sub.3 before the polymerization reaction is quenched and when Mooney viscosity of polybutadiene has reached a prefixed value, preferably lower than, or equal to 30; the polymerization of butadiene is carried out in a solution in an aliphatic or cycloaliphatic solvent, in the presence of a catalytic system based on rare earths, preferably a neodymium-based catalytic system.
Claims8
Method for preparing polybutadiene with a high content of 1,4-cis-structure, endowed with characteristics of improved processability and of improved resistance to cold flow, which method consists of polymerizing butadiene, in solution in a hydrocarbon solvent, in the presence of a catalytic system comprising at least one metal belonging to the group of the rare earths and of adding PCl.sub.3 to the polymeric solution before the polymerization is quenched and when the Mooney viscosity is higher than 25.
Dependencies are inferred from the claim text.