Natural Fiber Composite Patents: Leaders, Trends & White Space 2026
A patent landscape review of natural fiber composite interface modification: filing trends since 2017, assignee concentration, IPC composition, receiving offices and the most-cited prior art, with guidance on where claim
Filing growth = 2021 (21 records) → 2024 (21); 2024 is the last year we treat as complete. Top-5 share = the 5 largest assignees ÷ all 493 records in scope (CR5), not the ranked leaders only.
What this landscape covers
Interface modification is the part of natural fiber composite engineering that decides whether a plant-fiber or lignocellulosic reinforcement actually bonds to its resin matrix. The claim language in this dataset centers on surface treatment, coupling agents and compatibilization chemistry applied to natural or lignocellulosic fibers before they go into a composite, polymer or resin system. It sits at the intersection of fiber science and bulk polymer formulation: C08L polymer-composition claims dominate the corpus, but a large share also touch additive chemistry, processing and shaping.
The 493 records in scope span 2015 through the 2026 cut-off, filed across jurisdictions led by China, with meaningful volume from the United States, Europe, South Korea, India and the WIPO PCT route. Because publication lags filing by roughly 18 months, the most recent one to two years understate real filing activity and should not be read as a slowdown.
Filing trend and technology composition
Two views of the same 493-record corpus: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
A peak in 2017, then a plateau
Filings peaked at 53 in 2017 and have since settled into a lower, flatter band; the like-for-like comparison the dataset supports is 2021 (21 filings) versus 2024 (21 filings), a 0% change over that three-year span. Treat 2025 and 2026 figures as still filling in rather than as evidence of decline.
Publication lags filing by roughly 18 months, so 2025 onwards are still filling in. Growth rates on this page therefore end at 2024; running them to the last bar would understate the field.
Polymer composition claims dominate
C08L (polymer compositions) appears on 84.6% of the 493 records, with C08K additive claims on 58.0% and C08J processing claims on 34.9%. Shaping (B29C, 23.5%), preparation (B29B, 10.8%), textile treatment (D06M, 7.7%), laminates (B32B, 6.5%) and condensation polymers (C08G, 4.1%) form a secondary tier — since records can carry several IPC codes, these shares add to more than 100%.
Shares are the percentage of the 493 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Natural Fiber Composite Interface Modification Patent Landscape with Eureka
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Try EurekaThe prior art that shapes freedom to operate
US10711394B2 — Composite having plant fiber textile and fabricating method thereof
The patent covers a plant fiber textile used as a continuous reinforcement layer within a resin matrix, where the plant fibers receive a surface modification pretreatment — a coupling-agent treatment, a fire-retardant treatment, or both — before being combined into a laminate stack that can also include glass, aramid or carbon fiber layers.Filed by AVIC Composite Corporation Ltd, granted 2020-07-14.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN102617915A | 一种防霉变无卤阻燃抑烟木塑复合材料及其制备方法 | 72 |
| 2 | CN104327530A | 一种阻燃抗静电木塑复合材料及其制备方法 | 68 |
| 3 | CN105504501A | 一种具有防霉、抗菌性能的天然纤维增强聚丙烯复合材料及其制备方法 | 62 |
| 4 | CN102977460A | 一种注塑级天然纤维复合材料及其制备方法 | 61 |
| 5 | US20050225009A1 | Manufacturing process for high performance short ligno-cellulosic fibre – thermoplastic composite materials | 58 |
| 6 | US20040214925A1 | Coupling agents for natural fiber-filled polyolefins | 55 |
| 7 | CN101538401A | 耐热型二元纤维/聚乳酸基复合材料及其制备方法 | 51 |
| 8 | US20150044924A1 | Composite having plant fiber textile and fabricating method thereof | 46 |
| 9 | CN104448567A | 植物纤维表面接枝超支化聚酰胺改善复合材料力学性能的方法 | 44 |
| 10 | KR1020130103154A | Polypropylene-polylactic acid mixed resin/graphene/natural fiber bionanocomposite and manufacturing method of… | 41 |
Citation counts favor older filings in any searched corpus; read them as a signal of influence on later filers, not as a measure of current commercial importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-outs from the assignee ranking, filing trend and jurisdiction mix that matter more for strategy than the raw counts alone.
No single company owns this field
The five most active assignees together account for just 9.3% of the 493 records in scope, and the ten most active for 16.0%. That is a long tail of single- and few-filing entrants rather than a field locked up by two or three incumbents.
A plateau, not a decline
Filings ran flat at 21 in both 2021 and 2024 after an early peak of 53 in 2017. The apparent drop in 2025-2026 reflects publication lag rather than a real fall-off in activity.
China is the primary filing venue
China accounts for 305 of the tracked records, well ahead of the United States (38), the EPO (34), South Korea (26), India (21) and the WIPO PCT route (20). A freedom-to-operate review that skips Chinese filings misses most of the corpus.
Composition claims are the crowded layer
C08L polymer-composition claims sit on 84.6% of the 493 records, with additive (C08K, 58.0%) and processing (C08J, 34.9%) claims layered on top. Textile-specific treatment under D06M appears on only 7.7% of records, a narrower and less contested branch.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to natural fiber composite interface modification patent landscape, with the prior art for and against each one.
Where to take this analysis
The dataset points to a field with open competitive space but dense composition-claim prior art. The next steps depend on whether you are clearing a product or building a filing strategy.
Map your formulation against the composition layer
With 84.6% of records carrying a C08L claim, any new coupling-agent or compatibilizer formulation needs a claim-by-claim check against that layer before development spend, not after.
Run a claim comparison in EurekaWatch the long tail, not just the leaders
Because the top 10 assignees hold only 16.0% of the 493 records, competitive monitoring built around a handful of known players will miss most of the field's activity.
Set up assignee tracking in EurekaTreat D06M textile treatment as a narrower branch
At 7.7% of records, textile-specific fiber treatment claims are far less crowded than composition claims, which may leave room for a narrowly drafted first filing.
Explore white space in EurekaCommon questions on this landscape
It covers patents claiming a surface treatment, fiber treatment, coupling agent or compatibilization step applied to natural, plant or lignocellulosic fibers used in a composite, polymer or resin system. The search string combines that treatment language with fiber and matrix terms, and restricts results to IPC classes covering polymer compositions, polymer processing, plastics shaping and textile chemical treatment. It excludes fiber types outside the natural/lignocellulosic definition, such as pure glass or carbon fiber treatments with no natural-fiber component.
The assignee ranking is a long tail: the leading company holds 10 records, fifth place holds 8, and tenth place holds 6, out of 493 records in scope. The top 5 assignees combined account for only 9.3% of all records and the top 10 for 16.0%, so no single company dominates. That spread means competitive tracking needs to cover well beyond the handful of most-active filers to capture most of the activity in the field.
Filings peaked at 53 in 2017 and have since settled lower, with the most reliable recent comparison being 21 filings in 2021 against 21 in 2024 — a flat, 0% three-year change. Figures for 2025 and 2026 look lower still, but that reflects the roughly 18-month lag between filing and publication, not a real drop in activity. Treat the field as holding steady at a reduced level relative to its 2017 peak rather than declining.
China is by far the largest filing venue with 305 of the tracked records, compared with 38 in the United States, 34 at the EPO, 26 in South Korea, 21 in India and 20 filed via the WIPO PCT route. Any clearance search limited to US and European filings would miss the majority of the corpus. Teams planning to manufacture or sell in China should weight their search and monitoring accordingly.
US10711394B2, assigned to AVIC Composite Corporation Ltd and granted 2020-07-14, claims a plant fiber textile with a surface-modification pretreatment — coupling agent, fire retardant, or both — combined into a laminate stack that can include glass, aramid or carbon fiber layers. It is a relevant reference for anyone building a multi-layer laminate around a treated continuous plant-fiber textile, particularly where fire retardation is combined with a coupling treatment. It does not by itself cover single-layer composites, chopped or short-fiber reinforcement, or treatments outside coupling-agent and fire-retardant chemistry, so a design-around review should focus on those boundary points.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.