| abstract |
The invention relates to a high molecular weight bimodal neodymium-catalysed polybutadiene having a high proportion, > 95%, of cis-1,4 units and a low proportion, < 1%, of 1, 2-vinyl content, wherein the polybutadiene has a linear polymeric main fraction and a long chain branched polymeric fraction, wherein the slop in the RGM relationship is > 5% for the polymeric main fraction and < 0.3% for the long chain branched polymeric fraction. |