| abstract |
A method for preparing a branched polybutadiene having a high content of 1,4-cis units, the method comprising polymerizing butadiene in the presence of at least one organic solvent and in the presence of: a) a catalytic system prepared in situ Including: (a 1 ) at least one neodymium carboxylate, (a 2 ) at least one alkyl compound of aluminum, (a 3 ) at least one alkyl compound of aluminum containing at least one halogen atom, and b) at least one containing Organic esters of at least one halogen atom.n n n Depending on the degree of branching and molecular weight distribution, the branched polybutadiene with a high content of 1,4-cis units is suitable for a variety of applications, such as the modification of plastic materials [for example, the manufacture of high impact polystyrene ( (HIPS)] to the manufacture of tires, especially the tread and / or sidewalls of tires. |