Buna® Nd EZ

New Nd-BR grades: a breakthrough that bridge the gap between processability and superior properties

Easy processing without sacrificing high performance properties

The Buna® Nd EZ family of products is a new generation of high-cis polybutadienes that present a modified polymeric structure that enables marked improvements in the processing performance of rubber compounds but without sacrificing dynamic properties. This new family of polybutadienes catalysed by Neodymium has a very high cis 1,4 content combined with a low 1,2 vinyl content and a narrow molecular weight distribution but has an increased degree of branching when compared to our standard Nd-BR family of products. This increased degree of branching leads to a lower final compound viscosity and improved downstream processing on the mill or extruder for example. Subsequently the modified structure leads to improved polymer phase distribution and therefore improved filler distribution which results in excellent dynamic properties. These new grades of easy processing Nd-BR overcome the conflict between superior tire properties and challenging processing.

One of the key properties of these rubbers is their narrow polydispersity which leads to higher molar mass. In technical terms, the modification scheme of the new Nd-BR grades Buna® Nd 22 EZ and Buna® Nd 24 EZ is designed to create long chain branching, which accelerates the fast and reliable incorporation of fillers into the rubber matrix and improves processing.

Main Grades

NamePlantML 1+4Remark


Buna® Nd 22 EZDormagen63modified and long chain branched
Buna® Nd 24 EZDormagen44modified and long chain branched


Typical applications are tires, retreads, conveyor belts and anti-vibration bushings etc. They can be blended with NR for goods having thick sections requiring high resistance to reversion such as buffers, truck tire treads and roll covers needing high abrasion resistance, seals and other goods. They can be blended with SSBR to improve abrasion resistance and rolling resistance in tire tread sections. Provided that the compounds are formulated and processed correctly, the vulcanisates have good resistance to aging, reversion, abrasion and flex cracking with good low temperature flexibility and high resilience.




David Hardy
Technical Service - EMEA

Phone: +49 221 8885 6307

Marcus Moutinho
Technical Service - LATAM

Phone: +55 21 2677 1219

Esther Han
Technical Service - APAC

Phone: +65 6725 5777

Judy Douglas
Technical Service - NAFTA

Phone: +1 412 809 3547