From BPA to Biomass: The Feedstock Landscape of Bio-Based Epoxy Resin
Bio-based epoxy resins are thermosetting polymers in which one or more constituent components — the epoxy monomer, the curing agent, or both — are derived from renewable biological feedstocks rather than petroleum, directly addressing concerns over bisphenol A (BPA) toxicity and fossil resource depletion. The field is defined by the diversity of its renewable raw material classes, which range from abundant agricultural by-products to precisely engineered platform chemicals.
Patents retrieved across the 2012–2026 dataset span jurisdictions CN, GB, WO, JP, KR, and BR. The following bio-based raw material classes appear most frequently in the dataset:
- Lignin and lignin-derived phenolics — guaiacol (4-propylguaiacol), vanillin, ferulic acid, kraft lignin, lignosulfonates
- Plant oils — epoxidized soybean oil, castor oil, rubber seed oil
- Itaconic acid and furan-based platform chemicals — itaconic anhydride, 5-hydroxymethylfurfural (HMF)
- Terpenoids and natural product derivatives — rosin, turpentine-derived polyols, eugenol, cardanol
- Sugar-derived diols — isosorbide, sorbitol glycidyl ethers, L-malic acid
A recurring technical driver across the dataset is the desire to exceed 40–60% bio-based carbon content while maintaining or surpassing the mechanical performance benchmarks of bisphenol A diglycidyl ether (DGEBA): tensile strength ≥65 MPa, glass transition temperature (Tg) ≥120°C, and thermal decomposition temperature ≥320°C, as cited explicitly in one high bio-content patent filing from 2026.
Regulatory frameworks tracked by bodies including ECHA — specifically REACH and RoHS — are a primary driver of demand for BPA-free alternatives, creating a commercial pull that academic and industrial patent filers are now actively responding to. The landscape described here is derived from a targeted set of patent and literature records and represents a snapshot of innovation signals within this dataset only.
Innovation Timeline: From Foundational Chemistry to Closed-Loop Systems
Bio-based epoxy resin innovation has progressed through four distinct phases since 2012, moving from foundational lignin conversion chemistry to sophisticated dual dynamic covalent bond architectures designed for closed-loop recyclability. The 2025–2026 filing cluster, comprising approximately 15 distinct records, signals a step-change in both commercial intent and technical ambition.
Pre-2015 (Foundational Period): Early lignin-to-epoxy conversion routes were established by the Industrial Technology Research Institute (ITRI), Taiwan, through two filings (2012, 2013) describing acid anhydride/polyol modification of kraft lignin, lignosulfonates, and organosolv lignin with multi-epoxide compounds. The University of Montpellier (France) filed internationally (JP 2015) on bio-sourced epoxidized lipid derivatives reacted with glycidyl ethers of bio-based polyols to improve reactivity.
2016–2020 (Platform Diversification): Itaconic acid-based epoxies from the Ningbo Institute of Materials Technology and Engineering (NIMTE), Chinese Academy of Sciences, began appearing (2021 filings referencing earlier 2016–2018 priority work). Southwest University (2017) demonstrated fully bio-based epoxidized soybean oil/polyamide-1010 systems with tensile strength up to 38.5 MPa. Zhongnan University for Nationalities developed degradable hyperbranched epoxy resins with hexahydrotriazine structures, with results appearing in Nature Sustainability (2020).
Bio-based epoxy resin patent filings from 2025–2026 account for approximately 15 distinct records in the 2012–2026 dataset, indicating significant acceleration in innovation activity during the most recent two-year period.
2021–2023 (Recyclability Engineering): The NIMTE bio-based A3+B2 and A2+B3 hyperbranched precursor series (2021) targeted aerospace flame retardancy with V1-grade performance and impact strength of 30–70 kJ/m². Michigan State University (WO 2023) disclosed lignin-based epoxide prepolymers with epoxide functionality 2–8, enabling up to 100% replacement of conventional prepolymers. Henkel AG (JP 2023) entered with structural adhesive compositions incorporating bio-based epoxy compounds.
2024–2026 (Closed-Loop Recyclability): The most recent cluster is dominated by dual dynamic covalent bond architectures, carbon fiber composites designed for chemical degradation and fiber recovery, and high bio-content formulations achieving ≥60% bio-based carbon content. Key assignees include Beijing Forestry University, Zhongnan University for Nationalities, LG Chem, Kangda New Materials Group Co., Ltd., and Shanghai Chemical Research Institute Co., Ltd.
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Explore Patent Data in PatSnap Eureka →Four Technology Clusters Defining the Bio-Based Epoxy Resin Field
Bio-based epoxy resin innovation in this dataset organises into four distinct technology clusters, each with a characteristic feedstock logic, performance profile, and commercial trajectory. Understanding the differences between these clusters is essential for freedom-to-operate analysis and R&D prioritisation.
Cluster 1: Lignin-Based Epoxy Systems
The most extensively represented approach in the dataset. Lignin’s abundance — it is second only to cellulose in nature — its aromatic ring content, and its multiple hydroxyl functionality make it an attractive BPA surrogate. Conversion routes include acid anhydride esterification of lignin hydroxyls to carboxylates, followed by epoxidation with multi-epoxy compounds or epichlorohydrin. VITO (Flemish Institute for Technological Research) and ITRI both pursue lignin combined with epoxidized vegetable oil acid/ester combinations. Michigan State University’s WO 2023 filing describes lignin-based epoxide prepolymers with epoxide functionality 2–8, enabling up to 100% replacement of conventional prepolymers.
Multiple assignees — including ITRI, Michigan State University, VITO, and Beijing Forestry University — hold overlapping positions in lignin epoxidation chemistry. The key differentiator is lignin source consistency and processability (solubility, epoxide equivalent weight control), not reaction mechanism per se. IP freedom-to-operate analysis should map lignin pre-treatment and activation steps carefully.
Cluster 2: Plant Oil-Based and Terpenoid/Phenolic Systems
Epoxidized vegetable oils (soybean, castor, rubber seed) and lignin-derived low-molecular-weight phenolics (guaiacol, eugenol, vanillin, ferulic acid, cardanol) are used either as the primary epoxy matrix or as reactive diluents. Eugenol-based epoxies incorporating siloxane segments show notably low viscosity and intrinsic flame retardancy. Guaiacol-based systems benefit from aromatic ring density, conferring high Tg and flame resistance (LOI improvement cited). Castor oil/turpentine-derived polyol blends, as in Kangda New Materials Group Co., Ltd.’s 2026 filing, reach bio-based content ≥60%.
Cluster 3: Platform Chemical-Derived Systems (Itaconic Acid, HMF, Isosorbide)
Bio-based platform chemicals produced from fermentation of agricultural by-products are converted into multi-functional epoxy precursors. Itaconic anhydride reacted with bio-based hydroxy polyacids yields precursors with both ester linkages and reactive double bonds. HMF’s rigid furan ring and bifunctionality enhance mechanical strength in the crosslinked network. Isosorbide — produced from sorbitol dehydration — provides a bicyclic, rigid diol for glycidyl ether synthesis with low viscosity and high purity, as demonstrated in Kukdo Chemical Co., Ltd.’s 2025 KR filing. Standards for bio-based content measurement in these systems are tracked by organisations including ISO.
Cluster 4: Hyperbranched and Dynamic Covalent Bond Architectures
A structurally distinct approach using hyperbranched polymer topologies (A3+B2, A2+B3 monomer systems) derived from bio-based monomers simultaneously addresses toughness, flame retardancy, and recyclability. Dynamic covalent bonds — imine (Schiff base), disulfide, dynamic ester (vinylogous urethane, beta-hydroxy ester), and dual dynamic systems — are introduced to enable thermal reprocessing and/or chemical degradation recovery. Impact strength of 30–70 kJ/m² with V1 flame retardancy has been demonstrated. Carbon fiber composites made from these systems can be fully degraded in acidic hydrogen peroxide, enabling carbon fiber recovery and reuse.
“Dual dynamic covalent bond systems filed in 2024–2025 outperform single-bond systems in combining degradation rate, reshapeability window, and performance retention — with recovery rates up to 94.7% and re-cured materials retaining ≥93% of original tensile strength.”
Bio-based hyperbranched epoxy resin composites using A3+B2 and A2+B3 monomer systems from NIMTE-CAS (2021 filings) demonstrate impact strength of 30–70 kJ/m² with UL-94 V1 flame retardancy, targeting aerospace applications.
Application Domains: Where Bio-Based Epoxy Resin Is Winning Adoption
Bio-based epoxy resin technology is being pursued across five distinct application domains, each with its own performance requirements and regulatory context. Aerospace and high-performance composites represent the most technically demanding segment, while coatings and adhesives offer the most accessible near-term commercial entry points.
Aerospace and High-Performance Composites
Multiple CN-jurisdiction patents from NIMTE-CAS, Zhongnan University for Nationalities, and Beijing Forestry University explicitly target aerospace applications, citing requirements for high-temperature impact resistance, flame retardancy (UL-94 V0/V1), and structural integrity. Bio-based epoxy/carbon fiber composites with degradable matrices enabling closed-loop carbon fiber recovery appear in filings from 2023–2025. The convergence of bio-based matrix chemistry with fiber recovery is particularly significant given the high cost and energy intensity of carbon fiber production, a concern tracked by IEA in its industrial decarbonisation analyses.
Wind Energy and Automotive Lightweighting
Bio-based hyperbranched vanillin-based epoxy systems are cited for wind turbine blade applications, automotive lightweight structural components, and hydrogen storage tanks (type IV pressure vessels). Zhongnan University for Nationalities’ 2024 filing specifically targets wind blades and automotive structures, reflecting the intersection of lightweighting and circular economy mandates in these sectors.
Electrical/Electronic Encapsulation and Insulation
Plant oil-modified epoxy systems with acid anhydride curing agents are formulated for electrical insulation, with improved Tg and crack resistance versus bisphenol A systems. Eugenol-based bio-epoxy/siloxane compositions target electronic semiconductor encapsulation, demonstrating superior dielectric performance. LG Chem’s clustered 2025–2026 filings applying bio-based epoxy resin as the matrix in powder-phase-dispersed impact-toughened adhesive systems represent the clearest signal of near-term commercial product development targeting printed circuit boards and bonding films.
Coatings and Adhesives
Lignin-based bio-epoxy coatings (ITRI filings) target substrate surface compatibility, and Henkel AG’s (JP 2023) structural adhesive/primer formulations incorporate bio-based epoxy compounds. A pearl-nacre-inspired bio-based nanocomposite epoxy anticorrosive coating from Guangdong Research Institute of Corrosion Science and Technology (2022) demonstrates bio-based cardanol and itaconic acid epoxy in self-healing protective applications, representing an advanced functional coating concept.
Fully Bio-Based Composite Materials
Fully bio-sourced composite systems incorporating bio-based starch fillers and natural fiber reinforcement are targeted at packaging, construction, and general-purpose thermoset replacement of petroleum plastics. Jiangnan University’s 2019 CN filing represents the primary example in this dataset.
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Analyse Application Patents in PatSnap Eureka →Geographic and Assignee Landscape: China Leads, Korea Accelerates
Among the 50+ directly relevant records in this dataset, China (CN jurisdiction) dominates with approximately 30 filings, reflecting both the scale of Chinese university and institute research activity and the domestic industrial push to reduce dependence on petroleum-derived BPA. Innovation is concentrated rather than distributed: approximately 5–6 Chinese institutional clusters and 3–4 Western/Korean corporate players account for the majority of substantive filings.
The most active Chinese institutional clusters are Zhongnan University for Nationalities (at least 6 filings, 2022–2025, focused on hyperbranched vanillin/ferulic acid systems, recyclable composites, and carbon fiber recovery), NIMTE-CAS (at least 4 filings, 2021–2022, itaconic acid-based and flame-retardant composites), Beijing Forestry University (at least 2 filings, 2025, lignin-based closed-loop recyclable systems), and Kangda New Materials Group Co., Ltd. (1 filing, 2026, high bio-content commercial formulation).
LG Chem filed three nearly identical JP patent applications in February 2026 on bio-based curable resin compositions for electronics and automotive adhesive markets, signalling near-term commercialisation intent by a Tier-1 Korean chemical company in the bio-based epoxy resin space.
Japan accounts for approximately 8–10 relevant filings, predominantly from VITO (Belgium, filing in JP), Henkel (filing in JP), and academic institutions. Korea’s LG Chem filed multiple closely related curable resin composition patents (KR/JP/CN, 2025–2026) based on bio-based epoxy with powder-dispersion impact toughening, indicating a push toward electronics and automotive structural adhesive markets. Kukdo Chemical Co., Ltd. filed on isosorbide-based epoxy in KR (2025).
In Western jurisdictions, Michigan State University (BR 2023) and University of Montpellier (CN, JP, 2015–2016) represent academic filings, while Henkel AG (JP 2023) is the primary Western corporate assignee directly claiming bio-based epoxy compositions. The transition from NIMTE-CAS hyperbranched epoxy university patents (2021) to commercial-grade filings from Kangda New Materials Group Co., Ltd. (2026) within five years signals that Chinese industrial players are now adopting and scaling academic bio-based epoxy chemistry — a dynamic that non-Chinese players should monitor carefully for freedom-to-operate in key export markets.
Emerging Directions and Strategic Implications for R&D and IP Teams
Five directional signals emerge from the most recent filings (2024–2026) in this dataset, each with distinct implications for R&D strategy, IP positioning, and commercial planning. These signals collectively indicate that the field is moving from partial substitution toward practical drop-in replacement of petroleum-derived epoxy systems.
1. Closed-Loop Chemical Recycling via Dual Dynamic Covalent Networks
Multiple 2025 filings from Beijing Forestry University and Shanghai Chemical Research Institute Co., Ltd. introduce dual dynamic covalent bonds (imine + dynamic ester, or imine + disulfide) into bio-based epoxy matrices, enabling rapid degradation at near-ambient conditions (30–70°C, dilute acid) with recovery rates up to 94.7% cited. The recovered oligomers can substitute for partial curing agents in re-cured systems, maintaining ≥93% of original tensile strength. R&D teams should prioritise dual-bond designs for applications requiring end-of-life compliance with EU ecodesign and extended producer responsibility frameworks tracked by OECD.
2. Bio-Based Carbon Fiber Composite Recycling
The combination of bio-based epoxy matrices with carbon fiber reinforcement, designed explicitly for acid-oxidative degradation to recover fibers, represents a convergence of sustainability and circular economy themes. Fibers recovered from degradable bio-epoxy composites are targeted for reuse in power cables, wind blades, and aerospace components. This approach directly addresses the end-of-life challenge that has long limited composite adoption in circular economy frameworks.
3. High-Purity Isosorbide Epoxy for Coatings
Kukdo Chemical Co., Ltd.’s 2025 KR filing on low-viscosity, high-purity isosorbide diglycidyl ether synthesis (improved yield process) signals industrial-scale interest in a sugar-derived BPA-replacement monomer that retains the rigid bicyclic structure needed for high-Tg thermosets. This represents a commercially scalable route that does not require the lignin pre-treatment complexity associated with Cluster 1 systems.
4. Commercial-Grade Bio-Based Epoxy Adhesive Compositions
LG Chem’s clustered 2025–2026 filings (three JP, two CN) applying bio-based epoxy resin as the matrix in powder-phase-dispersed impact-toughened adhesive systems represent the clearest signal of near-term commercial product development by a Tier-1 chemical company targeting electronics (printed circuit boards, bonding films) and automotive adhesives. These represent near-term competitive threats to incumbent petrochemical-derived epoxy formulators.
5. Fully Bio-Based Content Claims ≥60%
Where earlier filings (2016–2020) typically reported 30–50% bio-content, 2025–2026 filings explicitly target and achieve ≥60% bio-based carbon content in commercial-grade formulations with verified performance metrics: Tg ≥120°C, tensile ≥65 MPa, and impact ≥12 kJ/m². This moves the field toward practical drop-in replacement rather than partial substitution — a threshold that matters for procurement specifications and regulatory claims.
“Bio-curative substitution — replacing only the curing agent with a bio-based equivalent while retaining conventional epoxy resins — may offer the fastest near-term commercial pathway, requiring no upstream monomer synthesis capabilities and achieving ≥40% bio-based carbon content.”
The Jones/Paul PCT approach (WO/GB 2023) demonstrates ≥40% bio-based content by substituting only the curing agent while retaining conventional epoxy resins, minimising formulation risk and capital cost. This strategy is accessible to any downstream compounder without upstream monomer synthesis capabilities and represents the lowest-barrier entry point into the bio-based epoxy market. Patent landscape data from sources including WIPO confirms the growing international scope of bio-based polymer IP filings across these application domains.
The Jones/Paul PCT application (WO 2023) demonstrates ≥40% bio-based carbon content in epoxy resin formulations by substituting only the curing agent with a bio-based equivalent, without modifying the epoxy resin itself — a commercially scalable approach accessible to downstream compounders without upstream monomer synthesis capabilities.