Overview of Zeon’s Circular Feedstock Concept
2026-02-26
Organize the institutional conditions and technical axes of the concept to produce C4/C5 monomers from renewable carbon, and examine the upstream transformation of the synthetic rubber industry.
https://green-innovation.nedo.go.jp/resources/pdf/development-plastic-raw-material-manufacturing/item-002/vision-zeon-001.pdf
Premise Notes
NEDO Green Innovation Fund project.
Target: core synthetic rubber monomers.
C4 Butadiene
C5 Isoprene
A concept to shift the existing petroleum-centered supply structure toward renewable carbon.
Time horizon: commercialization in the 2030s.
Via pilot-scale validation.
Collaboration framework with The Yokohama Rubber Co., Ltd.
Background
The tire market is large.
Demand for synthetic rubber remains structurally stable.
At the same time:
• Dependence on petroleum
• Scope 3 emissions
• Heavy reliance on thermal recycling
End-of-life tires have a high collection rate.
However, material circulation remains limited.
The concept is to return this to “feedstock.”
Technical Axes
Ethanol-Derived Butadiene
• Catalyst improvement
• Yield enhancement
• Pilot-scale development
A fermentation-derived route proceeds in parallel.
Bio-Isoprene
• Development of production strains
• Fermentation efficiency
• Separation and purification cost
For microbial routes, yield and separation cost are the essential issues.
LCA-Based System Design
• CO2 reduction volume
• Energy intensity
• Facility location
Carbon neutrality is evaluated at the system level, not at the single-product level.
Industrial Structure Perspective
Circularization at the monomer stage.
Tire manufacturers differentiate through compounding,
but carbon neutrality at the feedstock stage is led by material suppliers.
Redesign of the upstream supply chain.
Competitive axis:
Performance × Carbon intensity × Stable supply.
Not price alone.
Risk Structure
• Risk of cost inversion
• Catalyst lifetime at mass-production scale
• Volatility of bio-feedstock prices
• Degree of policy dependence
In particular, economic rationality at scale.
Whether carbon-neutral feedstock can sustain a premium,
or whether it becomes regulation-driven.
Interaction with institutional conditions.
Notes
Not merely recycling, but substitution of the carbon source.
From thermal recovery to monomer regeneration.
When discussing tire circularity, monomer conversion is more structural than rCB or devulcanization.
However, technical difficulty is high.
Rational as a strategy for companies controlling feedstock.
One form of survival strategy for the materials industry.