Halogen-Free Flame Retardant Patents: Leaders & Trends 2026
- Concentrated but not locked up. the top 5 assignees hold 25.8% of the 264 records in scope, and the top 10 hold 38.6% — a leader well ahead of the field but no single-company lock.
- Filing activity has more than doubled since 2021. growth from 8 filings in 2021 to 17 in 2024 (+113%), even as the 2017 peak of 21 has not yet been matched on a complete-year basis.
- Two IPC subclasses dominate the claim space. C08L (polymer compositions) and C08K (polymer additives) each appear in well over 60% of records, leaving cable/insulator (H01B) and fibre (D01F) applications comparatively thin.
Filing growth compares 2021 (8 records) with 2024 (17) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 264 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Halogen-free and phosphorus-based flame retardant systems sit at the intersection of polymer additive chemistry and fire-safety regulation. This landscape covers 264 published records filed between 2015 and mid-2026 that combine flame-retardant claim language with technical markers such as limiting oxygen index, char formation, loading level and migration — the parameters that separate a workable formulation from one that sacrifices mechanical strength for fire performance.
The dataset spans polycarbonate and polyester resin systems, phosphorus-based additive chemistries, and their downstream use in cable insulation and fibre products, giving a cross-section of where halogen-free substitution has actually been claimed rather than just discussed.
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Filing trends and technology composition
Two views of the same 264-record set: how filing activity has moved year over year, and which IPC subclasses carry the claim volume.
Filing trend: a 2017 peak, then a renewed climb
Filings peaked at 21 in 2017, dipped, and then rebuilt momentum: 2021 filings of 8 grew to 17 by 2024, a +113% increase over that three-year span. 2025 and 2026 figures (down to 3 in 2026) are undercounts, not a real slowdown — publication typically lags filing by around 18 months, so the most recent two years will keep filling in as more records publish.
Technology composition: additive and resin-composition classes dominate
C08L (polymer compositions) covers 63.6% of the 264 records and C08K (polymer additives) covers 62.1% — the two core classes for formulating a flame-retardant resin system. Condensation polymers (C08G, 17.8%) and cable/conductor insulation (H01B, 13.3%) trail well behind, with fibre applications (D01F) and shaping processes (B29C) each under 10%. Because records can carry multiple IPC classes, these shares sum to more than 100% of the 264-record total.
Shares are the percentage of the 264 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Halogen-Free Flame Retardant Systems with Eureka
This page is one run against one query. Ask Eureka your own question about halogen-free flame retardant systems and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative claim
Halogen-Free Flame Retardant Polycarbonate/Thermoplastic Polyester Molding Compositions with Polymeric Phosphorus Flame Retardant
This disclosure relates to halogen-free flame retardant polycarbonate/thermoplastic polyester molding compositions with improved mechanical properties and increased polyester loading level. More particularly, the disclosure relates to halogen-free polycarbonate/thermoplastic polyester resin alloys with polymeric phosphorus flame retardant additive and siloxane impact modifier. Also included are methods for preparing such compositions and articles there from.Filed by SABIC Global Technologies, this filing is representative of the dataset's core approach: pairing a polymeric phosphorus flame retardant with an impact modifier to hold mechanical properties while raising the polyester loading level — the tradeoff that recurs across the most-cited records.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | JP2009007487A | Aromatic polycarbonate resin composition, molded product using the same, and method for manufacturing the mol… | 71 |
| 2 | US20110144244A1 | Halogen-free flame retardant material | 68 |
| 3 | US7700680B2 | Polyester compositions flame retarded with halogen-free additives | 42 |
| 4 | CN101838538A | 含有DOPO侧链结构的聚磷酸酯阻燃剂及其制备方法 | 40 |
| 5 | CN101768338A | 无卤无锑阻燃聚对苯二甲酸乙二醇酯工程塑料及制备方法 | 36 |
| 6 | US20080090950A1 | Polyester Compositions Flame Retarded With Halogen-Free Additives | 35 |
| 7 | EP0249723A2 | Red phosphorus flame retardant and nonflammable resinous composition containing the same | 34 |
| 8 | US20120225291A1 | Low smoke halogen free flame retardant thermoplastic vulcanizate compositions containing zeolites | 30 |
| 9 | WO2005121232A1 | Polyester compositions flame retarded with halogen-free additives | 29 |
| 10 | WO2015103006A1 | Flame retardant thermoplastic compositions | 28 |
Citation counts favour older filings that have had more time to accumulate citations within the searched corpus — read them as a signal of influence on the field, not of current commercial relevance.
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 findings that shape where a new filing would land relative to existing claim density.
A clear leader, then a long tail
The leading assignee holds 21 records against a fifth-place figure of 9 and a tenth-place figure of 6 — concentration exists at the very top, but it drops off quickly. The top 10 combined hold 38.6% of the 264 records in scope, leaving well over 60% spread across the remaining ranked assignees.
Renewed filing activity after a mid-decade lull
Filings grew from 8 in 2021 to 17 in 2024. That rebuild follows years below the 2017 peak of 21, suggesting the field cooled after an initial wave of halogen-free substitution claims and is now attracting a second round of filers.
China leads receiving offices, US and Europe close behind
China accounts for the largest share of receiving-office filings at 85, ahead of the United States at 54 and the EPO at 46. WIPO/PCT filings (19) and Japan (12) and India (10) trail, indicating most protection is still sought directly in the largest manufacturing and consumption markets rather than routed broadly through PCT.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to halogen-free flame retardant systems, with the prior art for and against each one.
Who is filing, and where the claim space still has room
The ranked leaders sit alongside a large number of single- or few-filing entrants, and recent-year momentum for even the top names has gone quiet — a sign the field may be between filing waves rather than settled.
One assignee well ahead of the field
The leading assignee's 21 records put it clearly ahead of fifth place (9) and tenth place (6), but recent-year momentum data shows several of the most active historical filers, including this one, recorded zero filings in the latest year — consistent with publication lag rather than a real pullback.
Collaboration is limited and mostly intra-group
Only 10 co-assignee pairs appear in the dataset. The strongest pairing, at 4 shared records, links two related entities under a common corporate group rather than two independent competitors, and the next-strongest pairs (2 records each) follow the same pattern of inventor-to-assignee co-filing rather than cross-company joint development.
Filing activity clusters around resin and additive producers
The assignee list is dominated by polymer and resin producers — polycarbonate, polyester and engineering-plastics makers — rather than specialty flame-retardant chemical houses, suggesting much of the claim activity is defensive formulation work by resin suppliers protecting specific loading levels and mechanical-property outcomes.
| Assignee | Recent year | YoY |
|---|---|---|
| DSM IP Assets B.V. | 0 | — |
| E.I. du Pont de Nemours & Co. | 0 | — |
| King Abdulaziz City for Science and Technology | 0 | — |
| Mitsubishi Engineering-Plastics Corporation | 0 | — |
| SABIC Global Technologies B.V. | 0 | -100% |
| Lotte Advanced Materials Co., Ltd. | 0 | — |
| Nan Ya Plastics Corporation | 0 | — |
| Kingfa Sci. & Tech. Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, competitive tracking or identifying open claim space.
Map claims against the leading assignee's portfolio
With one assignee holding 21 of 264 records, a freedom-to-operate check should start by mapping its specific claim scope on loading level and mechanical-property tradeoffs before drafting new formulation claims.
Explore assignee portfolios in EurekaTrack the post-2021 filing rebuild as it publishes
The +113% growth from 2021 to 2024 is likely to extend as 2025-2026 filings continue publishing; revisit the trend in six to twelve months to see which assignees are driving the renewed activity.
Set up filing alerts in EurekaTest claim language in the under-claimed branches
Cable insulation, fibre applications and DOPO-side-chain chemistries show lower filing density than core resin-composition classes, making them worth a closer novelty check before committing R&D budget.
Run a novelty search in EurekaCommon questions about halogen-free flame retardant patents
The ranked leaders in this dataset are dominated by large polymer and specialty-chemical producers rather than niche flame-retardant houses. The top assignee holds 21 of the 264 records in scope, with the top 5 combined accounting for 25.8% and the top 10 combined for 38.6%. Below that concentration, filing activity spreads across a long tail of assignees with only a handful of records each, so the field is led but not dominated by any single company.
Most filings sit in polymer composition (C08L, 63.6% of the 264 records) and polymer additive use (C08K, 62.1%), reflecting that the core innovation is formulation-level: how a phosphorus-based or other halogen-free additive is loaded into a resin system. Condensation polymers, cable insulation, fibre products and plastics-shaping processes each appear in a smaller share of records, indicating these downstream applications are less densely claimed than the underlying resin chemistry.
Filing activity is rebuilding, not slowing. From 2021 to 2024, filings grew from 8 to 17, a documented +113% increase, though the field has not yet matched its 2017 peak of 21 filings on a complete-year basis. The apparent drop in 2025-2026 figures is an artefact of publication lag, which typically runs around 18 months, rather than evidence of declining interest.
IPC composition data points to cable and conductor insulation applications (H01B, 13.3% of records), fibre and filament features (D01F, 6.1%), and specialty applications (C09K, 6.1%) as carrying markedly lower filing density than the core resin-composition classes. DOPO-side-chain phosphorus chemistries and migration-resistant additive binding also show comparatively thin coverage relative to general loading-level claims, making them worth a targeted novelty search before filing.
China leads as a receiving office with 85 filings, ahead of the United States at 54 and the European Patent Office at 46. WIPO/PCT filings total 19, with Japan at 12 and India at 10. The pattern suggests applicants are prioritising direct filing in the largest manufacturing and end-use markets over broad PCT routing.
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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.