Halogen-Free Flame Retardant Plastics Patents: Leaders & Trends 2026
- 29.4% concentration at the top. The five leading assignees together hold 543 of the 1,845 records in scope — a real lead, but not a lock on the field.
- Filing has cooled from its 2017 peak. Filings ran from 91 in 2017 down to 4 in 2026 (partial year); the complete-year comparison shows 2021's 54 filings falling to 31 by 2024, a 43% drop over that span.
- Additives and polymer-composition claims dominate. C08K and C08L together touch the majority of records, while adhesives and layered-product claims (C09J, B32B) each sit under 5% — a much thinner claim base.
Filing growth compares 2021 (54 records) with 2024 (31) — 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 1,845 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 1,845 published records at the intersection of halogen-free flame retardancy and engineering plastics — filings that combine phosphorus-based or melamine-cyanurate chemistry with test criteria like glow wire performance, UL94 rating, dripping suppression and electrical tracking resistance. The scope spans 2015 through the 2026-07-31 cut-off, covering both composition claims (additive packages, polymer blends) and application claims tied to specific flammability or electrical-safety standards.
Because publication lags filing by roughly 18 months, the last one to two years in any trend chart will always look thinner than they eventually turn out to be. Treat the most recent bars as provisional rather than as evidence of a slowdown.
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Filing trend and technology composition
Two views of the same 1,845-record dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
Filing trend, 2017–2026
Filings peaked at 91 in 2017. Using only complete years, 2021's 54 filings had fallen to 31 by 2024 — a 43% decline over that three-year span. Years after 2024 are still filling in under publication lag and should not be read as a continuing drop yet.
IPC subclass composition
C08K (additives) appears in 65.0% of the 1,845 records and C08L (polymer compositions) in 51.2%, confirming that most activity is compositional rather than process-based. Condensation polymers (C08G, 15.6%) and misc.-application materials (C09K, 13.9%) form a second tier, while cable/insulation (H01B, 6.3%), adhesives (C09J, 4.6%) and laminates (B32B, 4.4%) are comparatively thin. Records can carry multiple classes, so these shares sum to more than 100%.
Shares are the percentage of the 1,845 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 Engineering Plastics with Eureka
This page is one run against one query. Ask Eureka your own question about halogen free flame retardant engineering plastics and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
US5037869A — Process for preparing flame retardant polyamide molding resins containing melamine cyanurate
An improved process is disclosed for preparing flame retardant polyamide molding resins containing melamine cyanurate as a flame retarding agent which results in products with improved mechanical properties and good flame retarding properties. It comprises the addition of a glycol and a phthalate ester to the process wherein a polyamide, melamine or derivatives thereof and cyanuric acid are melt-blended in the presence of water.Filed by Solutia Inc., granted 1991-08-06 — a foundational process patent for melamine-cyanurate flame retardant systems that predates most of the current filing wave.
View full record →| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2002028953A1 | Halogen-free flame retarder composition and flame retardant polyamide composition | 207 |
| 2 | US20010007888A1 | Flame retardant resin composition | 142 |
| 3 | US20050250885A1 | Halogen-free flame retardant polyamide composition with improved electrical properties | 100 |
| 4 | WO2008119693A1 | DOPO flame retardant compositions | 98 |
| 5 | US20060058432A1 | Halogen-free flame retardant polyamide composition with improved electrical and flammability properties | 94 |
| 6 | US20070176154A1 | Flame retardant composition with improved fluidity, flame retardant resin composition and molded products | 69 |
| 7 | EP1524294A1 | Thermoplastic resin composition, polymer composition, and molded object obtained from the composition | 69 |
| 8 | US20110144244A1 | Halogen-free flame retardant material | 68 |
| 9 | US20040138351A1 | Flame retardant compositions | 65 |
| 10 | US6054515A | Flame retardant compounds and compositions | 64 |
Citation counts reflect an older-skewed corpus signal, not current commercial relevance — cited-by counts naturally accrue to earlier filings.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for strategy
Reading concentration, composition and citation data together points to where claim space is crowded and where it is not.
A lead, not a lock
The five leading assignees combine for 543 of the 1,845 records in scope. That is meaningful concentration but leaves over two-thirds of the field to a long tail of entrants — the top 10 only extends the share to 39.9%.
Additive claims dominate the field
Nearly two-thirds of records sit in C08K (additives) and just over half in C08L (polymer compositions). Adjacent process and application classes — adhesives, laminates, cable insulation — carry a fraction of that volume.
Cooling from a 2017 peak, not collapsing
Filings peaked at 91 in 2017. The last fully comparable window shows a genuine pullback from 54 filings in 2021 to 31 in 2024. Years after 2024 are still incomplete under normal publication lag.
Older filings anchor the citation graph
The most-cited record, a halogen-free flame retardant polyamide composition filing, carries 207 citations — a reminder that citation counts favour age over current relevance in a corpus spanning more than a decade.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to halogen free flame retardant engineering plastics, with the prior art for and against each one.
Who is filing, and where the gate sits
Filing concentration sits with a small group of large materials and chemicals companies, but co-filing activity and the remaining 60% of the field show room for new entrants to build position.
A clear single leader
The leading assignee holds 206 records, well ahead of the fifth-place holder at 50 and the tenth-place holder at 35. That gap suggests a materials incumbent with a broad, defended portfolio rather than a crowded top tier.
University collaboration at the top
The strongest co-assignee pair in the dataset links the leading company with a university partner across 19 records, with two named individual co-inventors appearing repeatedly alongside it — a sign of sustained applied-research collaboration rather than one-off joint filings.
Momentum has flattened across major filers
Recent-year filing counts for the largest named assignees are flat or down, including one filer showing a -100% year-on-year change. This is consistent with the broader 2021-to-2024 cooling rather than any single company retreating from the space.
| Assignee | Recent year | YoY |
|---|---|---|
| BASF SE | 1 | 0% |
| DSM IP Assets B.V. | 0 | — |
| Italmatch Chemicals S.p.A. | 0 | — |
| ADEKA Corporation | 0 | -100% |
| E.I. du Pont de Nemours & Co. | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| SABIC Global Technologies B.V. | 0 | — |
| Asahi Kasei Corporation | 0 | — |
Where to take this next
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio benchmarking or identifying open claim space.
Map freedom-to-operate against the top holders
With 29.4% of records held by five assignees, a targeted clearance search against those portfolios — not the full 1,845-record set — is the efficient first move for anyone filing new compositional claims.
Run a freedom-to-operate search →Track the DOPO and adhesive branches
C09J and B32B classes sit under 5% of records each, well below the additive core — worth a closer look before committing R&D budget to a crowded C08K composition claim.
Explore white space in Eureka →Common questions about this landscape
Filing activity is concentrated among a small group of large materials and chemicals companies, with the leading assignee holding 206 of the 1,845 records in scope. The top five assignees combine for 543 records, or 29.4% of the field, while the top ten reach 39.9%. That leaves a majority of records spread across a long tail of smaller filers, so leadership at the top does not mean the field is closed to new entrants.
Filings peaked in 2017 at 91 in a given year and have declined since. Comparing only complete years, 2021 saw 54 filings against 31 in 2024, a 43% drop over that three-year span. Filing counts for 2025 and 2026 appear lower still, but publication typically lags actual filing by around 18 months, so those most recent years are not yet a reliable basis for calling the trend finished.
US5037869A, assigned to Solutia Inc. and granted in 1991, covers a process for making flame retardant polyamide molding resins using melamine cyanurate, with the specific addition of a glycol and a phthalate ester during melt-blending. It is a process patent focused on that particular preparation method, not a blanket claim over melamine-cyanurate flame retardancy generally. Anyone using a different blending sequence or additive combination for melamine-cyanurate systems is likely working outside its specific process claims, though a proper freedom-to-operate review of the full claim set is still warranted before commercial use.
IPC composition data shows heavy concentration in additive claims (C08K, 65.0% of records) and polymer compositions (C08L, 51.2%), while adhesives (C09J, 4.6%) and layered laminate structures (B32B, 4.4%) carry far fewer filings. DOPO-based reactive flame retardant chemistry and electrical tracking resistance applications in cable insulation (H01B, 6.3%) also sit well below the core composition classes. These thinner classes are worth scouting for open claim space before pursuing a crowded core composition claim.
The field shows moderate concentration rather than domination by a single player: the top five assignees hold 29.4% of the 1,845 records in scope, and extending to the top ten only adds another 10.5 percentage points, reaching 39.9%. This gap between the leader's 206 records and the tenth-place holder's 35 records indicates one clear front-runner followed by a broad group of mid-sized and smaller filers, rather than a tight oligopoly.
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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.