| 摘要 |
<p>The invention relates to methods for increasing the mooney viscosity in a stepwise manner in the production of high-molecular-weight polybutadiene having a fraction of cis-1,4 units > 95 wt% and a fraction of 1,2-vinyl < 1 wt%, characterized in that 1) at least one monomer, selected from butadiene and/or isoprene, is polymerized in the presence of at least one inert, organic solvent and in the presence of at least one catalyst based on neodymium carboxylate at temperatures of -20°C to 150°C, 2) then the polymerization is stopped by adding protic compounds, and 3) thereafter sulfur chlorides are added to the polymerizate, the sulfur chlorides being treated with a carboxylic acid, fatty acid, and/or fatty acid ester before being added to the polymerizate.</p> |
