Hindered Amine Light Stabilizer Patents: Leaders & Trends 2026
- Concentrated but not locked up. The top 5 assignees hold 19.2% of all 1,564 records in scope and the top 10 hold 31.5% — leadership exists but a long tail of single- and few-filing entrants still has room to move.
- Filing has cooled from its 2019 peak. Annual filings hit 91 in 2019; from 2021 (45) to 2024 (34), the last complete year, volume fell 24%, though 2025-26 counts will rise as publication catches up.
- Additive-use claims dominate the class map. 70.1% of records sit in C08K (additives in polymers) and 50.6% in C08L (polymer compositions), leaving coatings (C09D, 11.2%) and laminates (B32B, 9.5%) comparatively thin.
Filing growth compares 2021 (45 records) with 2024 (34) — 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 1,564 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Hindered amine light stabilizers protect polymers, coatings and laminates from UV-driven degradation through the Denisov cycle, a radical-scavenging mechanism that regenerates the active nitroxide species over the product’s service life. Patent activity in this dataset spans 2015 through mid-2026 and is filtered to records that discuss the chemistry’s practical constraints — basicity, migration, extraction, molecular weight and interaction with pesticides or UV absorbers — rather than HALS mentioned only in passing.
The 1,564 records in scope span polymer additive formulations, coating photostability systems and layered/laminate constructions, with filings concentrated at a handful of established chemical majors and a long tail of smaller entrants working narrower applications.
Filing trend and technology composition
Two views of the same 1,564-record corpus: filing activity by year, and where those records sit across IPC subclasses. Because a single record can carry several IPC codes, the class shares below add to more than 100% of the record total.
A 2019 peak, then a real but partial decline
Annual filings rose to 91 in 2019 from 38 in 2017, then eased back. The clearest complete-year comparison — 45 filings in 2021 against 34 in 2024 — shows a 24% drop. Counts for 2025 and 2026 will climb as publication lag (roughly 18 months from filing) closes, so the most recent two years should not be read as the trend's actual floor.
Additive and composition claims dominate
C08K (use of additives in polymers) and C08L (polymer compositions) together anchor the field at 70.1% and 50.6% of the 1,564 records respectively. Processing (C08J, 13.6%), addition polymers (C08F, 11.7%), coatings (C09D, 11.2%) and laminates (B32B, 9.5%) trail well behind, marking narrower but less crowded claim territory.
Shares are the percentage of the 1,564 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Hindered Amine Light Stabilizer Systems with Eureka
This page is one run against one query. Ask Eureka your own question about hindered amine light stabilizer systems and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in this space
US20020068777A1 — Process for devolatilizing an acrylic resin using an aminoether-functional HALS
Filed by Anderson Development Co., this record describes removing residual solvent and low molecular weight material from an acrylic resin by adding a hindered amine light stabilizer bearing at least one aminoether group, then devolatilizing the mixture at elevated temperature. The resulting composition is positioned for powder coating use, with the aminoether-functional HALS serving a dual role in both processing and eventual photostability.Illustrates how HALS chemistry claims frequently reach beyond stabilization itself into upstream resin processing steps.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4839405A | Ultraviolet stabilizer compositions, stabilized organic materials, and methods | 204 |
| 2 | US5605761A | Articles exhibiting durable color containing a polycarbonate, a fluorescent dye and an amine light stabilizer | 201 |
| 3 | US5393812A | Flame retardant, light stable composition | 195 |
| 4 | US6353042B1 | UV-light stabilization additive package for solar cell module and laminated glass applications | 143 |
| 5 | US20060111481A1 | Stabilized aliphatic polyester compositions | 127 |
| 6 | EP0792911A2 | Flame resistant polyolefin compositions | 108 |
| 7 | US5816238A | Durable fluorescent solar collectors | 101 |
| 8 | WO1999005206A2 | UV light stabilization additive package for solar cell module and laminated glass applications | 99 |
| 9 | US5260135A | Photodegradation-resistant electrodepositable primer compositions | 92 |
| 10 | US20090093564A1 | Method for forming cured product from photocurable composition and cured product | 81 |
Citation counts inside a searched corpus skew toward older filings simply because they've had longer to accumulate citations — read them as a signal of influence on later work, not of current commercial relevance.
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Browse MCP servers →What the numbers mean for a filing decision
Three figures from this dataset matter most for anyone deciding whether — and where — to file next in HALS chemistry.
Leadership is real but not exclusionary
The top 5 assignees combined hold 19.2% of all 1,564 records in scope, and the top 10 hold 31.5%. That leaves roughly two-thirds of the corpus spread across 90+ other ranked entities plus unranked filers — enough headroom that a well-differentiated formulation claim is not automatically boxed in by the leaders.
A real cooling, but not a collapse
Filings dropped from 45 in 2021 to 34 in 2024, a 24% decline over the only span currently comparable on a complete-year basis. Several leading assignees show flat or negative year-on-year counts in the latest recorded year, but publication lag means 2025-26 figures will still revise upward.
Additive-use claims crowd the center
C08K and C08L together account for the large majority of activity, meaning core additive-formulation claim space is heavily occupied. Coatings (C09D) and laminates (B32B) sit in the low double digits, which is where narrower, less-contested claim scope is more likely to be available.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hindered amine light stabilizer systems, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Dow Global Technologies LLC | Rohm and Haas Company | 27 |
| Cytec Industries Inc | CYTEC INDUSTRIES INC | 3 |
| Ciba Holding Inc | Ciba Geigy AG | 3 |
| Dow Global Technologies LLC | XU XIANMIN | 2 |
| Dow Global Technologies LLC | MIAO WENKE | 2 |
| Dow Global Technologies LLC | ESSEGHIR MOHAMED | 2 |
| Ciba Holding Inc | CIBA SPECIALTY CHEM SPA | 2 |
| General Cable Technologies Corp | EASTER MARK R | 2 |
Co-assignee activity is thin overall — only 10 recorded pairs — with one pairing between a US chemical major and its subsidiary standing out well above the rest, suggesting most HALS patenting in this dataset happens within a single corporate entity rather than through joint filings.
Who is filing, and where the gate is set
Filing leadership sits with established specialty-chemical and polymer producers, but the concentration figures show this is not a two- or three-player field — it is a leader group backed by a long tail.
A single leader well ahead of the field
The top-ranked assignee holds 87 records against 42 at fifth place and 35 at tenth — a steep drop-off that marks a genuine leader rather than a tightly bunched top group.
Breadth beyond the household names
The ranking spans 100 companies, not a top-10 or top-50 cut — it is the full set the data endpoint returns, and it includes cable, coatings, resin and specialty-polymer producers alongside the major chemical houses.
Recorded activity has gone quiet for some leaders
Several of the more active historical assignees show zero filings in the latest recorded year, alongside a steep year-on-year drop for at least one other — consistent with the broader 2021-2024 cooling, though publication lag means this understates true recent activity.
| Assignee | Recent year | YoY |
|---|---|---|
| Cytec Industries Inc | 1 | -50% |
| BASF SE | 0 | -100% |
| Dow Global Technologies LLC | 0 | — |
| Arkema Inc | 0 | — |
| Sekisui Chemical Co., Ltd. | 0 | — |
| Borealis AG | 0 | — |
| E.I. du Pont de Nemours & Co. | 0 | — |
| Ciba Holding Inc | 0 | — |
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio benchmarking or identifying a filing gap.
Check freedom-to-operate against the leader's claim set
With one assignee holding 87 records against a steep drop to the fifth-place filer, any new formulation claim in core additive chemistry should be checked against that leader's granted claims first.
Run a claim comparison in EurekaMap the under-claimed branches in detail
Coatings, laminates and pesticide co-formulation sub-areas show materially lower filing density than core additive-use claims — worth a targeted search before committing R&D spend.
Explore white space in EurekaWatch for the 2025-26 revision
Because publication lags filing by about 18 months, the apparent 2025-26 slowdown will revise upward; re-run the trend view once more of that data has published.
Track filing trends in EurekaCommon questions on HALS patent activity
One assignee leads the ranked field with 87 records, well ahead of the fifth-placed filer at 42 and tenth place at 35. That said, the top 5 assignees combined hold only 19.2% of the 1,564 records in scope, and the top 10 hold 31.5%, so leadership is clear but does not amount to control of the field. The ranking itself covers 100 companies, spanning specialty chemical majors alongside polymer, coatings and cable producers.
Filings peaked at 91 in 2019 after rising from 38 in 2017, then eased off. The most reliable complete-year comparison, 45 filings in 2021 against 34 in 2024, shows a 24% decline over that span. Filing counts for 2025 and 2026 will still rise as publication lag closes — publication typically trails filing by around 18 months — so it's premature to call this a sustained collapse rather than a cooling from an unusually active 2019.
The large majority of records, 70.1% of the 1,564 in scope, fall under IPC class C08K covering additive use in polymers, with 50.6% also in C08L for polymer compositions generally. Processing methods (C08J), addition polymers (C08F), coatings (C09D) and laminates (B32B) each account for roughly 7-14% of records. Because a single filing can carry multiple IPC codes, these percentages add to more than 100% and should be read as overlapping footprints, not a strict breakdown.
Coatings photostability (C09D, 11.2% of records) and layered/laminate applications (B32B, 9.5%) carry substantially lower filing density than the dominant additive-composition classes. Specific sub-areas — aminoether-functional HALS used in resin processing, HALS-pesticide co-formulation stability, and low-migration formulations for sensitive applications — show up in the dataset's abstracts but not in high volume, suggesting narrower but more available claim territory than core additive-use chemistry.
This filing from Anderson Development Co. claims a process for removing residual solvent and low molecular weight material from an acrylic resin by adding an aminoether-functional hindered amine light stabilizer and heating the mixture to devolatilize it, aimed at producing a powder coating composition. It's notable for tying HALS chemistry to an upstream resin-processing step rather than only to end-use photostability. Anyone developing aminoether-HALS processes for acrylic or powder-coating resins should review its claim scope directly rather than assume it only covers finished-product stabilization.
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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.
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