Liquid Farnesene Rubber

In cooperation with the bioscience company Amyris, Kuraray has developed Liquid Farnesene Rubber. Liquid Farnesene Rubber is synthesized by Kuraray from beta-farnesene, a renewable monomer produced by Amyris using established fermentation processes in which proprietary yeast strains convert sugar sources such as sugarcane into beta-farnesene.

The polymerized form of bio-based farnesene is the unique Liquid Farnesene Rubber. Its viscosity is much lower compared to current liquid isoprene rubber. When used as an additive in rubber compounds, it imparts high plasticity. In addition, it maintains excellent flexibility even at low temperatures and improves ice grip performance.

Thanks to its optimal molecular weight, Liquid Farnesene Rubber reacts completely with solid rubber during vulcanization, meaning, unlike an oil, which migrates to the rubber’s surface over time and thus impede hardening, it stays bonded. Therefore, its tire performance is maintained over the long term.

Liquid Farnesene Rubber possesses a highly branched brush-like structure with molecular chains that do not easily become entangled with one another. In addition, a highly reactive double bond on the end of each branch ensures that, when vulcanized, Liquid Farnesene Rubber completely reacts with solid rubber and solidifies.


Special properties
  • Good plasticizing effect
  • Low migration and bleeding
  • Low tan δ over wide temperature range
  • Excellent softening effect at low temperature (low Tg)
  • Bio-based material
  • Less entanglement between molecules
Main areas of applications
  • Tire treads (Replacement of resins or oils)
  • Soft bead filler
  • Under-cushion
  • Under-tread
  • Tread