Polymer Blends Patents: Who Leads, Where the Gaps Are 2026
- Filing has cooled since its 2020 peak. 15 families that year against 3 so far in 2026 (partial), with the 2022 midpoint already down to 5 — this is a flat-to-declining field, not a growing one.
- No single assignee is pulling away. Recent-year momentum shows the most active historical filers — including Dow and Kimberly-Clark — all logging zero new families in the latest year, pointing to a mature, dispersed field rather than a live filing race.
- Claims cluster tightly in C08L. 207 of 217 records touch polymer compositions (C08L), while additive use (C08K, 62) and condensation polymers (C08G, 25) are comparatively thin — a sign of where composition claims are dense and where they are not.
Filing growth compares 2021 (6 records) with 2024 (3) — 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 217 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks 217 patent families filed between 2015 and mid-2026 that combine polymer blend or polymer alloy language with compatibilization mechanics — phase morphology control, interfacial tension reduction, reactive compatibilizers, impact modification and processing-window claims — inside the C08L, C08J and C08 class family. It is a narrow, mechanism-defined slice of polymer chemistry rather than a broad materials category.
Filing activity peaked in 2020 and has since declined toward the 2022 midpoint and beyond, with the most recent year understated because publication typically lags filing by around 18 months. Receiving-office data shows the United States and the European Patent Office carrying the largest shares, with WIPO PCT filings a secondary but meaningful channel for entrants seeking multi-jurisdiction coverage.
Filing trend and technology composition
Two views of the same 217-family dataset: how filing activity has moved year over year, and how those families distribute across IPC subclasses.
A field past its filing peak
Annual filings rose from 2 in 2017 to a peak of 15 in 2020, then eased toward 5 at the 2022 midpoint and down to 3 in the still-partial 2026 count. Read the tail end cautiously: publication lag means 2025 and 2026 figures will rise somewhat as later filings surface.
Composition claims dominate the class mix
C08L (polymer compositions) appears in 207 of 217 records, making it close to a prerequisite classification for this search rather than a differentiator. C08J (processing) and C08K (additives) trail well behind, and B29B, C08G and D01F each cover a minority of filings — these thinner subclasses are where composition space is comparatively open.
Shares are the percentage of the 217 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Polymer Blends and Compatibilization with Eureka
This page is one run against one query. Ask Eureka your own question about polymer blends and compatibilization and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this corpus
Thermoplastic starch via in-situ reactive extrusion plasticization and compatibilization
A method of producing a thermoplastic starch by an in-situ reactive extrusion plasticization process and a method for preparing a starch/polymer blend by an in-situ reactive extrusion plasticization and compatibilization process. In the method, a plasticizer reaction precursor (or a plasticizing compatibilizer reaction precursor) is mixed with starch to adhere to the surface of the starch or enter the starch to break the intermolecular and intramolecular hydrogen bonds of the starch. Then a mixture of the plasticizer reaction precursor and starch is subjected to extrusion to produce the thermoplastic starch or the starch/polymer blend.Filed by North University of China — one route among several for bio-based blend compatibilization documented in this dataset.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US6008298A | Modified cycloolefin copolymer | 100 |
| 2 | US6605657B1 | Polymer compositions containing thermoplastic starch | 99 |
| 3 | US20040044136A1 | Method for making polymer mixtures and compositions thereof | 82 |
| 4 | US5863986A | Polymer alloy blend or composition and shaped articial obtained therefrom | 81 |
| 5 | US5852114A | Biodegradable thermoplastic polymer blend compositions with accelerated biodegradation | 80 |
| 6 | US6284842B1 | Coupling of blends of alpha-olefin/vinyl aromatic monomer or hindered aliphatic vinyl monomer interpolymers w… | 79 |
| 7 | US6844380B2 | Method of making polymer compositions containing thermoplastic starch | 77 |
| 8 | US6930150B2 | Method for making polymer mixtures and compositions thereof | 75 |
| 9 | US20030119949A1 | Method of making polymer compositions containing thermoplastic starch | 72 |
| 10 | WO2000069930A1 | Highly crystalline eaodm interpolymers | 65 |
Citation counts favour older filings simply because they have had more time to accumulate citers inside this corpus; treat this list as a map of foundational prior art, not of current commercial weight.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Reading the trend and citation data together points to a field where the foundational claims were staked early and later filers are working narrower angles.
The peak has passed
Annual filings climbed steadily through the late 2010s, peaked at 15 in 2020, and have since fallen back toward single digits. That pattern is consistent with a technology whose core composition claims have already been staked out, leaving later entrants to file around narrower processing or additive variations.
Composition claims are the dense zone
Nearly every record in this dataset touches C08L polymer compositions, while D01F fibre features (13) and B29B plastics preparation (20) see comparatively little activity. New filers should expect the densest prior art in composition claims and somewhat more room in preparation and fibre-feature classes.
Foundational patents are decades-old
The most-cited record in this corpus, US6008298A on modified cycloolefin copolymer, and its peers date from the late 1990s and early 2000s. Their citation counts reflect years of accumulation inside a searched corpus, not current commercial relevance — useful as a map of prior art density, not of who is active now.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to polymer blends and compatibilization, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| ExxonMobil Chemical Patents Inc. | The Yokohama Rubber Co., Ltd. | 2 |
| Dow Chemical Company | TERBRUEGGEN ROBERT H | 1 |
| Dow Chemical Company | SILVIS H CRAIG | 1 |
| Dow Chemical Company | MULLINS MICHAEL J | 1 |
| Dow Chemical Company | HO THOI H | 1 |
| Dow Chemical Company | CUMMINS CLARK H | 1 |
| Polyvalor Limited Partnership | RODRIGUEZ FRANCISCO | 1 |
| Polyvalor Limited Partnership | RAMSAY BRUCE A | 1 |
Only 10 co-assignee pairs appear across 217 families, and the strongest pairing recurs just twice — most work here is filed by a single assignee rather than through joint ventures or co-development arrangements.
Who holds ground, and where they have stopped
Recent-year momentum data shows the historically active assignees in this space all recording zero new families in the latest tracked year — a signal of a settled rather than contested landscape.
Dow Chemical
Appears among the most active historical assignees in this dataset and in several co-assignee pairs, but shows no new filings in the most recent tracked year — consistent with the broader slowdown across the field.
Kimberly-Clark Worldwide
A repeat name in the assignee ranking with no filings logged in the latest year, suggesting its polymer-blend portfolio in this specific mechanism space is now largely settled rather than actively expanding.
North University of China
Filed the representative recent record in this dataset, covering in-situ reactive extrusion for starch-based thermoplastic blends — an example of academic filers pursuing bio-based compatibilization routes as commercial incumbents slow down.
| Assignee | Recent year | YoY |
|---|---|---|
| Dow Chemical Company | 0 | — |
| Polyvalor Limited Partnership | 0 | — |
| Shakespeare Company LLC | 0 | — |
| Eveready Battery Company, Inc. | 0 | — |
| NOVON INT | 0 | — |
| Kimberly-Clark Worldwide, Inc. | 0 | — |
| ExxonMobil Chemical Patents Inc. | 0 | — |
| Toray Industries, Inc. | 0 | — |
Where to take this analysis
The landscape data points to specific next steps depending on whether you are clearing a filing or scouting a licensing target.
Check freedom-to-operate against the dense composition cluster
With 207 of 217 records touching C08L, any new composition claim needs clearance against a crowded field rather than a sparse one — start there before drafting.
Run a claim search in EurekaTrack the thinner subclasses for open claim space
D01F, C08G and B29B carry meaningfully fewer filings than C08L — worth a closer look if you are trying to stake new ground rather than design around existing art.
Explore white space in EurekaCommon questions on polymer blend patents
The assignee ranking in this dataset is dispersed rather than dominated by one filer — companies including Dow Chemical and Kimberly-Clark Worldwide appear among the more active historical filers, alongside academic institutions such as North University of China filing bio-based blend methods. No single assignee shows sustained recent-year momentum: several of the most historically active names show zero filings in the latest tracked year. That pattern suggests the field is closer to settled than to being actively contested by a leader.
Filing activity peaked in 2020 at 15 families in this dataset and has declined since, sitting at 5 by the 2022 midpoint and 3 in the still-partial 2026 count. Because publication typically lags filing by around 18 months, the most recent one to two years will likely revise upward somewhat as later filings are published. Even accounting for that lag, the overall trajectory across the tracked window is flat to declining rather than growing.
A reactive compatibilizer is an additive or grafted polymer segment that chemically reacts at the interface between two immiscible polymers to reduce interfacial tension and stabilize phase morphology in a blend. It matters for patent claims because this mechanism sits at the core of the search criteria for this dataset, alongside phase morphology, interfacial tension and impact modification language. Filings that specify a particular reactive chemistry, processing window or resulting morphology tend to be the more defensible and more frequently cited claims in this space, as seen in the older, heavily-cited foundational patents.
C08L, covering polymer compositions, appears in 207 of the 217 families tracked here, making it close to universal across this search rather than a distinguishing feature. C08J, polymer processing and solutions, is the next most common at 96 records, followed by C08K additives at 62 and C08F addition polymers at 49. Subclasses like D01F (fibre features, 13 records) and B29B (plastics preparation, 20 records) see much lower activity, marking them as comparatively less contested areas of the classification.
Based on IPC distribution, the thinner subclasses relative to the dominant C08L composition claims are D01F fibre-feature compatibilization, C08G condensation-polymer compatibilizers, and B29B plastics preparation processing windows. These are not empty categories, but they carry a fraction of the filing density seen in core polymer compositions. Combining a specific reactive chemistry with one of these under-filed mechanism-processing pairings is a reasonable place to look for a defensible first claim, though a full freedom-to-operate search against the specific sub-area is still necessary before filing.
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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.