Asahi Kasei to produce solution-polymerized styrene-butadiene rubber using butadiene derived from plastic waste

Supply agreement for sustainable butadiene concluded with Shell

Asahi Kasei SSBR-Plant in Singapore
Asahi Kasei SSBR-Plant in Singapore – (Picture: Asahi Kasei).

Asahi Kasei concluded an agreement with Shell Eastern Petroleum (Pte) Ltd. (hereinafter “Shell”) on November 23, 2021, regarding the supply of butadiene derived from plastic waste and biomass (hereinafter “sustainable butadiene”). The signing ceremony was held at the “Creating the Plastic Circular Economy in Singapore: Journey from Vision to Reality” event on Bukom Island, Singapore. Asahi Kasei plans to begin producing and marketing sustainable solution-polymerized styrene-butadiene rubber (S-SBR) using the sustainable butadiene at its plant in Singapore by the end of fiscal 2021.

S-SBR is a type of synthetic rubber used mainly for high-performance fuel-efficient tires (eco-friendly tires). Demand for eco-friendly tires is growing worldwide with stricter environmental regulations and heightened environmental awareness. By enhancing fuel-efficiency performance while maintaining safety performance, S-SBR is recognized as an optimum material for eco-friendly tires. To accelerate efforts for decarbonization to achieve carbon neutrality by 2050, the automotive industry is transitioning to electric vehicles while the tire industry is further improving the fuel-efficiency and wear resistance of tires. Against this background, there is rising demand for greater sustainability of S-SBR as a material for eco-friendly tires.

Asahi Kasei continues to focus on technological developments for high-performance S-SBR products that enable further improvements to fuel efficiency and wear resistance, in order to meet requirements for increased driving range and mass production of electric vehicles. Moreover, Asahi Kasei has sought to transition to sustainable feedstock in order to reduce CO2 emissions throughout its supply chain. Shell is working to reduce CO2 emissions during production of chemicals and realize a circular economy with the goal of becoming a net-zero emissions energy business by 2050, in step with society. Shell will produce sustainable butadiene by mass balance* method in two ways at Shell Energy and Chemicals Park Singapore, located on Bukom. The first is a method of converting plastic waste into pyrolysis oil and feeding it to its Ethylene Cracker Complex, and the second is using bio-feedstock as a feed.

Asahi Kasei will be the world’s first company to use butadiene derived from plastic waste, and the first Japanese company to use butadiene derived from biomass, for S-SBR production (according to internal research). Throughout the life cycle of tires from materials, production, use (driving), disposal, and recycling, the proportion of CO2 emissions in the case of internal combustion engine vehicles is highest in the use phase. In the case of electric vehicles, in contrast, use-phase emissions are reduced by a wide margin, making emissions from materials such as S-SBR relatively higher. The use of sustainable S-SBR therefore enables a significant reduction in CO2 emissions over the life cycle of tires. Asahi Kasei thus expects to make a significant contribution to reduced CO2 emissions throughout the supply chain through the production of S-SBR using sustainable butadiene.

Asahi Kasei will now advance preparations to acquire international certification for biomass and recycled feedstock. In addition to improving the performance of its S-SBR products and reducing CO2 emissions across the product life cycle toward the goal of becoming carbon neutral by 2050, Asahi Kasei aims to be a global leading sustainable partner for its customers.

*In the case of a mixture of sustainable feedstock and petroleum-derived feedstock in the production process for chemical products, an internationally applied method to assign the portion of sustainable feedstock to certain products.

 Mass balance diagram
Mass balance diagram


Asahi Kasei, press release, 2021-11-24.


Asahi Kasei Corporation
Shell Group


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