In technical terms, this modification technology is designed to create long chain branching, which accelerates the fast and reliable incorporation of fillers into the rubber matrix and improves processing. In addition, a proprietary chemical modification of the chains enhances the rubber/filler interaction, especially with carbon black in sidewall compounds maintaining the dynamic performance of the tyres made with the new grades at the high level of Lanxess standard NdBR grades.NdBR is rarely used on its own but in blends with other polymers, particularly solution SBR in tyre tread formulations using silica as the filler. It has been shown that the modification also enhances the inter polymer phase distribution, says the company. This will lead to improved distribution of the filler in the resultant compound.In addition, Lanxess says it has achieved a significant increase in the rubber's tackiness on the mill - without adding any processing aids. Hence, these new modified NdBR grades represent attractive alternatives for the Buna CB22 and Buna CB24 rubbers already widely applied in the tyre industry, says the company. According to Lanxess, the new grades show similar properties but are characterised by considerably easier processing characteristics. Both new grades are now available in sample and industrial size quantities.