Bimodal Polyolefin Patents: Top Companies & Filing Trends 2026
- 72.6% concentration. The five leading assignees hold 389 of 536 records in scope — this is a field with an occupied top, not an open race.
- Filings peaked in 2021 at 41. and fell to 2 by 2024, a -95% swing that predates the usual 18-month publication lag.
- Pipe-grade and additive claims stay thin. F16L and C08K sit under 10% of records each, well behind the C08L and C08F core.
Filing growth compares 2021 (41 records) with 2024 (2) — 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 536 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families addressing bimodal polyethylene and related multimodal polymer design, filtered to records that discuss cascade reactor configuration, short chain branching, stress crack resistance, processability, stiffness balance, gel formation or pipe grade requirements in their title or claims. The 536 records in scope span 2015 through the 2026-07-31 cut-off, giving a decade-plus view of how resin producers have claimed molecular weight distribution control and its downstream mechanical trade-offs.
The technology sits at the intersection of catalysis and reactor engineering: producers use multi-stage or cascade reactors to build a low-molecular-weight, high-density fraction for stiffness alongside a high-molecular-weight, low-density fraction for toughness and stress crack resistance. Patent activity here tracks pipe, film and cable grade requirements as much as it tracks the underlying catalyst chemistry.
Filing trend and technology composition
Two views of the same 536 records: how filing activity moved year over year, and which IPC subclasses carry the claim volume.
Filing trend, 2017–2026
Filings ran at 32 in 2017, climbed to a peak of 41 in 2021, then dropped sharply to 2 by 2024 — a -95% move over that three-year span. 2025 and 2026 show near-zero counts, but publication lags filing by roughly 18 months, so those final years are still filling in and should not be read as a continued decline.
Technology composition by IPC subclass
C08L (polymer compositions) and C08F (addition polymers) anchor the field at 70.3% and 61.9% of the 536 records respectively. B29C (shaping of plastics) follows at 25.7%. Pipe-specific claims under F16L and additive claims under C08K each sit under 10%, and cable/insulation claims under H01B are thinner still at 3.5% — each record can carry more than one class, so these shares overlap rather than sum to 100%.
Shares are the percentage of the 536 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Bimodal and Multimodal Polyolefin Design with Eureka
This page is one run against one query. Ask Eureka your own question about bimodal and multimodal polyolefin design and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited prior art
US20240301182A1 — Bimodal polyethylene composition
A bimodal polyethylene composition has a density of from 0.940 to 0.949 g/cm3, a melt index I2 of greater than 5 g/10 min and an environmental stress crack resistance (ESCR) of greater than 1000 hours as determined by ASTM D1693 in 100% IGEPAL CO-630 under condition B. The composition comprises a first ethylene copolymer and a second ethylene copolymer, and is described as relatively easy to process for molded articles.Filed by Nova Chemicals (International) S.A., published 2024-09-12.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2004000933A1 | Breathable films | 148 |
| 2 | US6787608B2 | Bimodal polyethylene composition and articles made therefrom | 130 |
| 3 | EP1146079A1 | Polymer composition for pipes | 111 |
| 4 | US20030149180A1 | Bimodal polyethylene composition and articles made therefrom | 101 |
| 5 | US6185349B1 | Multimodal polymer composition | 99 |
| 6 | US7868092B2 | Bimodal polyethylene compositions for blow molding applications | 87 |
| 7 | US7858702B2 | Enhanced ESCR bimodal HDPE for blow molding applications | 83 |
| 8 | US7193017B2 | High strength biomodal polyethylene compositions | 68 |
| 9 | US6642323B1 | Process to produce a homogeneous polyethylene material | 61 |
| 10 | US20060036041A1 | High strength bimodal polyethylene compositions | 60 |
Citation counts favour older filings that have had more time to accumulate citations within this corpus; treat them as a signal of influence on the field, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Reading the concentration, trend and citation data together points to a field where the claim map on stiffness-toughness balance is largely settled, and where the open questions sit at the processing and additive margins.
The top of the field is occupied
Five assignees account for 389 of the 536 records in scope, and the top ten extend that to 89.2%. A new entrant is not filing into open ground on core bimodal composition claims — it is filing around a small number of established portfolios.
Peak activity has passed, recent years still filling in
Filings ran at 41 in 2021, the peak of the dataset, and fell to 2 by 2024. Because publication lags filing by roughly 18 months, 2025 and 2026 counts are incomplete and should not be read as confirming a continued drop, but the 2021-2024 swing itself is real.
Composition claims dominate over process claims
C08L and C08F together cover the great majority of records, while shaping (B29C) and processing (C08J) trail well behind. Pipe grade claims under F16L sit at just 8.8% of records despite pipe being one of the named use cases in the search scope.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to bimodal and multimodal polyolefin design, with the prior art for and against each one.
Who holds the claim space
A small group of established polyolefin producers holds the great majority of filings, with recent-year activity from the largest names now at or near zero across the board.
A single leader well ahead of the field
The leading assignee holds 112 records against a fifth-place count of 50 and a tenth-place count of 16 — a steep drop-off that marks this as a concentrated rather than fragmented landscape.
Recent-year activity has gone quiet at the top
Several of the largest historical filers show zero filings in the latest year of the dataset. Given the 18-month publication lag this likely understates true recent activity, but it is consistent with the sharp 2021-2024 drop seen across the whole field.
Co-filing is limited and mostly internal
Only ten co-assignee pairs appear across the dataset, and the strongest pair is an intra-group relationship between two entities under the same corporate family rather than a cross-company alliance.
| Assignee | Recent year | YoY |
|---|---|---|
| Univation Technologies, LLC | 0 | — |
| Chevron Phillips Chemical Company LP | 0 | — |
| Borealis Technology Oy | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| Nova Chemicals (International) S.A. | 0 | — |
| Total Petrochemicals Research Feluy | 0 | — |
| Fina Technology, Inc. | 0 | — |
| Thai Polyethylene Co., Ltd. | 0 | — |
Where to take this
The concentration and trend data point to specific next checks before committing R&D or filing budget to this space.
Map freedom-to-operate against the top holders
With 72.6% of records held by five assignees, a freedom-to-operate check should start with their core composition claims rather than a broad field search.
Run an FTO scan in EurekaWatch the under-claimed branches
Cable-grade, catalyst-process and additive claims sit well below the C08L/C08F core in filing density and may offer more room to file distinct claims.
Explore white space in EurekaTrack the post-2024 filings as they publish
The 2025-2026 dip is a publication-lag artefact, not a confirmed slowdown; revisit the trend once those years mature.
Set a filing alert in EurekaCommon questions
The dataset's leading assignee holds 112 of the 536 records in scope, well ahead of the fifth-place holder at 50 and the tenth-place holder at 16. The top five assignees combined account for 72.6% of all records, and the top ten reach 89.2%. This is a concentrated field: a handful of established polyolefin producers, rather than a broad set of newer entrants, hold most of the composition and process claims.
No — filings peaked at 41 in 2021 and had fallen to 2 by 2024, a -95% drop over that three-year span. That said, publication lags filing by roughly 18 months, so the 2025-2026 figures in this dataset are still incomplete and understate real recent activity. The safest reading is that filing activity has cooled from its 2021 peak, not that it has stopped.
Bimodal polyolefins are produced with two distinct molecular weight populations, typically a low-molecular-weight/high-density fraction for stiffness and a high-molecular-weight/low-density fraction for toughness and stress crack resistance. Multimodal design extends this to three or more populations for finer control of the stiffness-toughness balance. Both approaches rely on cascade or multi-stage reactor configurations, which is why cascade reactor configuration appears as a defining search term in this landscape.
Pipe-specific claims in this dataset fall mainly under F16L (pipes and pipe fittings), which covers 8.8% of the 536 records, alongside the broader C08L polymer composition class that covers 70.3% of records. The relatively thin F16L share suggests that most pipe-grade innovation is being claimed as a composition (C08L/C08F) rather than as a pipe-specific structural claim, which is worth checking when scoping a pipe-grade filing.
US20240301182A1, assigned to Nova Chemicals (International) S.A. and published 2024-09-12, claims a bimodal polyethylene composition with density from 0.940 to 0.949 g/cm3, melt index I2 above 5 g/10 min, and environmental stress crack resistance above 1000 hours under ASTM D1693 condition B. It is built from a first and second ethylene copolymer and is positioned as easier to process for molded articles. Anyone targeting a similar density and ESCR window for molded or pipe-adjacent applications should review this claim set directly rather than relying on the abstract alone.
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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.