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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/metallocene-and-single-site-catalysts-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Catalysis & Process ChemistryMetallocene and Single-Site Catalyst Patents: Concentration at the Top, Room at the Edges
- 50.4% of all 5,784 records sit with the five leading filers, so freedom-to-operate work in this field starts with a short list, not a long one.
- Filing peaked in 2017 at 164 and had settled to 80 by 2024 (down from 107 in 2021) — a maturing core rather than a collapsing one, since 2025-26 counts are still filling in.
- C08F carries 85.5% of records while narrower classes like C10M (2.3%) and C08K (2.1%) show where claim density is much thinner.
5,784
Published Records
50%
Top-5 Share of All Records
-25%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (107 records) with 2024 (80) — 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 5,784 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Field Overview
What the patent record shows about metallocene and single-site catalysis
Metallocene and single-site catalyst chemistry sits at the intersection of organometallic synthesis and polyolefin process engineering. The claims in scope here cover comonomer incorporation control, narrow molecular weight distribution, activator and cocatalyst chemistry, silica supportation, reactor fouling mitigation, and melt processability — the practical problems that separate a lab-scale catalyst from one that runs cleanly in a commercial reactor. This is a chemistry with a long commercial history, and the patent record reflects that: a small number of petrochemical majors built the foundational estate, and later filings largely refine rather than replace it.
5,784 records fall within this search scope across 2015-01-01 to 2026-07-31. The assignee ranking, filing trend, IPC composition and most-cited records below are drawn directly from that set and are the basis for every figure on this page.
Filing activity and technology composition, 2015-2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Data
Filing trend and technology composition
Two views of the same 5,784-record set: how filing volume has moved year over year, and which IPC subclasses carry the claim density.
Filing trend: a 2017 peak, then a settling curve
Filings ran at 164 in 2017, the peak year in this dataset, and by 2021 had reached 107. By 2024 — the most recent year that can be treated as complete once publication lag is accounted for — the count stood at 80, a -25% move over that three-year span. Counts from 2025 onward are still filling in and should not be read as a further decline.
IPC composition: addition polymer claims dominate
C08F (addition polymers) appears on 85.5% of the 5,784 records in scope, confirming that most filings anchor on the polymerization chemistry itself rather than downstream compounding. C08L, C07F and B01J each sit in the 13-15% range, covering polymer compositions, organometallic compound claims and catalytic process claims respectively. Thinner classes — D01F, C10M, C08K — mark the edges of the field where claim density drops off sharply.
Shares are the percentage of the 5,784 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Metallocene and Single-Site Catalysts with Eureka
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The most-cited records anchor the field
Representative Filing
US5240894A — Method for making and using a supported metallocene catalyst system
EXXON CHEMICAL PATENTS INC.
The invention relates to a novel process for producing a supported metallocene catalyst system useful for the polymerization and/or copolymerization of olefins, alpha-olefins, and/or diolefins which results in a catalyst product which during polymerization, produces minimal to no reactor fouling and polymer of controlled morphology. The invention is particularly useful for but not limited to polymerizing propylene or copolymerizing propylene with olefins having two or more carbon atoms. The novel support technique described herein results in a catalyst which will obtain polymer product having controlled, uniform particle size, narrow molecular weight distribution, high bulk density and dependent properties.Filed by Exxon Chemical Patents Inc. — a supported-catalyst filing that ties reactor fouling control directly to particle morphology and molecular weight distribution.
View full recordMost-cited records in scope
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5198401A | Ionic metallocene catalyst compositions | 2,434 |
| 2 | US5462999A | Process for polymerizing monomers in fluidized beds | 1,692 |
| 3 | US5017714A | Silicon-bridged transition metal compounds | 1,405 |
| 4 | US4794096A | Hafnium metallocene catalyst for the polymerization of olefins | 1,260 |
| 5 | US6525157B2 | Propylene ethylene polymers | 1,226 |
| 6 | WO1995014044A1 | Polymerization catalyst systems, their production and use | 916 |
| 7 | US5240894A | Method for making and using a supported metallocene catalyst system | 870 |
| 8 | US7884163B2 | Silica-coated alumina activator-supports for metallocene catalyst compositions | 745 |
| 9 | US4892851A | Process and catalyst for producing syndiotactic polyolefins | 698 |
| 10 | US5384299A | Ionic metallocene catalyst compositions | 688 |
Citation counts favour older records by construction — a searched corpus accumulates citations over time, so this table is a signal of influence on subsequent filings, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing strategy
Three read-outs from the concentration, trend and citation data that matter for anyone deciding where to file or where to challenge.
Concentration
50.4%
of 5,784 records held by top 5 filers
The core estate is narrow
Half of all records in scope trace to five assignees. For a new entrant, this means freedom-to-operate diligence can focus tightly rather than scanning a diffuse field — but it also means the core claim space around supported catalyst systems and activator chemistry is well covered by a small number of well-resourced filers.
Top 10 combined reach 62.9% of the 5,784 records.
Trend
-25%
filing change, 2021 to 2024
A maturing core, not a shrinking one
Filing dropped from 107 in 2021 to 80 in 2024 after peaking at 164 in 2017. That pattern is consistent with a chemistry where the foundational claims are largely staked and later filings refine specific process parameters rather than open new ground.
2025-26 counts are still filling in due to publication lag.
Composition
2.1%-2.5%
share for D01F, C10M, C08K classes
Thin coverage at the process edges
While C08F polymerization claims dominate at 85.5% of records, the classes covering fibre applications, lubricants and additive use sit well under 3% each. These are the areas where claim density is lowest relative to the core.
Class shares sum above 100% because records carry multiple IPC codes.
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Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to metallocene and single-site catalysts, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who holds the estate, and where momentum has gone quiet
The ranked leaders account for the bulk of filing volume, but recent-year activity has slowed even among the top names — a signal that the next wave of claims may come from adjacent process refinements rather than new entrants.
Leader
1,097
records held by the top-ranked assignee
A single filer holds the largest single share
The leading assignee's record count is roughly a third larger than fifth place (329), underscoring how front-loaded this field is at the very top of the ranking.
Ranking covers 100 companies, counted in records.
Momentum
0 in latest year
for several top-10 assignees
Even leaders have gone quiet recently
Multiple top assignees show zero filings in the latest year tracked, with year-over-year drops as steep as -100% for some and -67% for others. This is consistent with the broader 2021-2024 decline rather than any single company exiting the space.
Publication lag means the most recent year understates true filing activity.
Collaboration
10
co-assignee pairs identified
Joint filings cluster around a few long-standing partnerships
The strongest co-assignee pairs link a catalyst originator with a downstream petrochemical operator or research institute, reflecting how supported-catalyst development often pairs a chemistry house with a plant operator or a national research centre.
Strongest pair recorded at 70 shared filings.
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Chevron Phillips Chemical Company LP | 1 | -67% |
| ExxonMobil Chemical Patents Inc. | 0 | — |
| Univation Technologies LLC | 0 | — |
| LG Chem Ltd. | 0 | -100% |
| Fina Technology Inc. | 0 | — |
| Total Petrochemicals Research Feluy | 0 | — |
| Borealis AG | 0 | -100% |
| Hoechst AG | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to a field with a narrow, well-defended core and thinner claim density at its process edges. Two directions follow from that.
Scope a freedom-to-operate check against the top filers
With 50.4% of records held by five assignees, a targeted FTO review against that short list will cover more ground than a broad field scan.
Explore assignee claims in EurekaMap the under-claimed branches against your own chemistry
Lubricant, fibre and additive-adjacent classes carry a fraction of the density seen in core polymerization claims — worth checking against any planned filing there.
Run a white space search in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions on metallocene catalyst patents
The patent record in this scope is concentrated: the top five assignees together hold 50.4% of the 5,784 records tracked, and the leading single assignee holds 1,097 records on its own. This means the foundational claim space around supported catalyst systems, activators and cocatalysts sits with a small group of established petrochemical and chemical companies rather than being spread across many smaller filers. Anyone assessing freedom to operate should start diligence with that short list before scanning the wider field.
Filing peaked in 2017 at 164 records and had eased to 80 by 2024, a -25% change from the 107 recorded in 2021. That pattern reads as a maturing technology base rather than an active decline, since publication typically lags filing by around 18 months and the 2025-26 figures in any such dataset are still incomplete. Treat any apparent drop in the very latest year with caution for that reason.
The core of the field, reflected in the C08F classification present on 85.5% of records, is addition polymerization chemistry — the olefin polymerization reactions the catalysts are built for. Supporting classes cover polymer compositions (C08L), organometallic compounds (C07F) and catalytic processes generally (B01J), each present on 13-15% of records. Narrower applications such as fibre processing, lubricants and polymer additives each appear on under 3% of records, marking thinner claim coverage at the edges of the field.
The classes with the lowest record share relative to the C08F core — lubricant applications, fibre-spinning melt processability and additive-package compatibility, each under 3% of the 5,784 records — carry noticeably less claim density than the polymerization core. That does not guarantee an easy filing, since some of that thinness reflects narrower commercial demand rather than pure novelty, but it is a reasonable starting point for scoping a first claim outside the most contested territory around supported catalyst systems and activators.
US5240894A, assigned to Exxon Chemical Patents Inc., claims a process for producing a supported metallocene catalyst system that controls reactor fouling and polymer particle morphology while producing narrow molecular weight distribution and high bulk density polymer. Anyone developing a supported catalyst route aimed at the same fouling-control and morphology-control outcomes needs to check their support technique and resulting particle properties against this claim scope. It sits among the most-cited records in this dataset, indicating it has shaped a substantial share of later supported-catalyst filings.
Answers are grounded in the same dataset. Derived from a Patsnap search on Metallocene and Single-Site Catalysts covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.