Polyimide Durability Patents: Leaders, Trends & White Space 2026
- 116 of 151 families sit in C08G condensation-polymer chemistry, meaning the core imidization routes are the most heavily claimed ground in this dataset — not the additive or coating layers built on top of them.
- Filing is still accelerating, not maturing: the trend dips to zero at the 2022 midpoint before climbing again, with 2020 the peak year so far at just 5 filings — this is a thin, active field, not a crowded one.
- Europe and the US lead filing offices at 40 and 36 records, with China at 19 — a reminder that durability testing standards (thermal aging, hydrolytic stability) still track Western qualification regimes more than volume manufacturing geography.
What this landscape covers
Polyimide environmental durability sits at the intersection of core condensation chemistry and applied stability testing: claims that specify how a polyimide film or resin resists thermal aging, UV exposure or hydrolysis over a service life, rather than claims on the base polymer alone. The 151 families in this dataset were pulled from title/abstract language naming polyimide or PI film together with durability test descriptors, cross-referenced against C08L79/08, C08G73/10 and G01N17 — polymer composition, condensation synthesis and corrosion/degradation testing classes respectively.
Because publication lags filing by roughly 18 months, the 2025-2026 filing counts in any trend line will understate real activity; treat the most recent one to two years as a floor, not a ceiling.
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Filing trend and technology composition
151 published families span 2015 to mid-2026, concentrated in condensation-polymer synthesis with secondary weight in polymer processing, additives and battery/circuit applications that consume durable polyimide as an input material.
A dip-then-climb trend, not a plateau
Filings ran at 4 in 2017, peaked at 5 in 2020, fell to 0 at the 2022 midpoint, and have since resumed — a pattern consistent with a technology re-entering active development after standards or application pull (likely battery separators and flexible circuits) renewed interest, rather than one winding down.
Condensation chemistry dominates the IPC mix
C08G accounts for 116 of 151 records, more than double the next class (C08L, 58). The H01M and H05K counts — 22 and 14 respectively — show durability claims increasingly written against battery and printed-circuit end uses, not just generic film stability.
Shares are the percentage of the 151 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Polyimide Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about polyimide environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaThe documents setting the citation baseline
Process for producing polyimide film, and polyimide film (US20080261060A1)
A solution containing a polyamic acid oligomer having at least one terminal alkoxysilyl group is applied to one or both sides of a self-supporting polyimide precursor film, which is then heated to effect imidization — producing a polyimide film with improved adhesiveness.Filed by Ube Industries; illustrates the dominant strategy of modifying film-forming solution chemistry ahead of imidization rather than post-treating the finished film.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US3288754A | Silicon modified polyamide-polyimide polymers | 55 |
| 2 | US3422061A | Coalesceable polyimide powders from a polycarbocylic aromatic dianhydride and phenylene diamine | 41 |
| 3 | US5122436A | Curable composition | 36 |
| 4 | US6180746B1 | Polyimide precursor solid residuum | 33 |
| 5 | CN103724630A | 嵌段型磺化聚酰亚胺-聚苯并咪唑质子交换膜材料的合成方法 | 31 |
| 6 | US7022810B1 | Proton exchange membrane materials for the advancement of direct methanol fuel-cell technology | 29 |
| 7 | US4708972A | Steam resistant modified polyimide foams | 26 |
| 8 | US4367296A | Structural materials and components | 26 |
| 9 | US4363690A | Structural materials and components | 25 |
| 10 | CN102746511A | 耐水解磺化聚酰亚胺及其制备方法和应用 | 24 |
Citation counts here favour older, foundational filings — US3288754A and US3422061A date to the polyimide chemistry's early decades and are cited for base composition, not current durability practice.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the filing pattern signals
Three structural features stand out once families are grouped by IPC subclass, office and year: where claim density sits, how thin the field still is, and what pulls it forward.
Synthesis routes, not surface treatments, are the busiest ground
Condensation-polymer chemistry (C08G) accounts for more than three-quarters of the corpus, well ahead of composition claims (C08L, 58) or processing/solution claims (C08J, 41). New entrants aiming at the monomer or imidization step are filing into the densest prior art in the dataset.
A field re-accelerating rather than maturing
The count of filings dropping to zero mid-trend and then climbing again is not typical of a saturating technology; it suggests a pause followed by renewed pull, plausibly from downstream battery and flexible-circuit demand rather than the base film chemistry itself.
Filing offices still track qualification regimes
Europe and the United States together account for more filings than China and the WIPO/PCT route combined, despite China's manufacturing weight in flexible electronics and battery separators — durability claims appear to follow where testing standards are set, not only where product is made.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to polyimide environmental durability, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| National Aeronautics and Space Administration (NASA) | Unitika Ltd. | 3 |
| Dow Global Technologies LLC | OHBA KAORU | 2 |
| Dow Global Technologies LLC | KIM EUNG KYU | 2 |
| Dow Global Technologies LLC | JIANG XIN | 2 |
| Dow Global Technologies LLC | JIANG QI | 2 |
| Dow Global Technologies LLC | HARRIS WILLIAM J | 2 |
| Unitika Ltd. | THE GOVERNMENT OFTHE UNITED STATES OF AMERICAAS REPRESENTED BY THE ADMINISTATOR OFTHE NAT AERONAUTICS & SPACE ADM | 2 |
| E.I. du Pont de Nemours and Company (DuPont) | SCHMECKPEPER MARK R | 1 |
Only 10 co-assignee pairs appear across the corpus, and the strongest is a NASA-Unitika pairing at 3 shared families — co-filing here looks more like research-partner collaboration than commercial cross-licensing.
Who holds the ground, and where activity has stalled
The named assignees with the deepest historical portfolios — DuPont, Dow Global Technologies, UOP, SABIC Innovative Plastics IP, General Electric and NASA — each show zero filings in the most recent year tracked, indicating the field's incumbents have gone quiet even as overall filing volume resumes.
Historic leaders are not the current filers
DuPont, Dow Global Technologies, UOP, SABIC Innovative Plastics IP, General Electric and NASA all show zero filings in the most recent tracked year. Their portfolios still anchor the citation baseline, but the active filing edge has moved to other, currently unnamed entrants.
Co-filing is thin and research-flavoured
Ten co-assignee pairs exist across 151 families. The strongest, NASA with Unitika at 3 shared families, and two Dow Global Technologies pairings with individual inventors at 2 each, point to project-level collaboration rather than joint commercial ventures.
No single assignee dominates the count
With 151 families spread across a wide assignee list and only small co-filing clusters, this reads as a fragmented field: a workable entry point for a new filer willing to specify a distinct durability mechanism rather than compete on base chemistry.
| Assignee | Recent year | YoY |
|---|---|---|
| E.I. du Pont de Nemours and Company (DuPont) | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| UOP LLC | 0 | — |
| SABIC Innovative Plastics IP B.V. | 0 | — |
| General Electric Company | 0 | — |
| National Aeronautics and Space Administration (NASA) | 0 | — |
| Unitika Ltd. | 0 | — |
| Shanghai Jiao Tong University | 0 | -100% |
Where to take this analysis
The counts above establish the shape of the field; turning that into a filing or freedom-to-operate decision means drilling into specific claim language and adjacent white space.
Map claim scope against C08G synthesis routes
Pull the independent claims from the densest C08G families to see which imidization or monomer-selection steps are already blocked before drafting new composition claims.
Explore in EurekaTrack the post-2022 filing resumption by applicant
Identify which entities are behind the renewed filing activity since the 2022 trough, since the named legacy assignees show no recent-year filings.
Explore in EurekaCheck the under-claimed gate areas for a first-filer position
The battery-interface and UV-stabilisation branches carry secondary IPC weight but no dominant assignee — worth a freedom-to-operate check before committing claim language.
Explore in EurekaCommon questions on polyimide durability patents
The dataset's deepest historical portfolios belong to DuPont, Dow Global Technologies, UOP, SABIC Innovative Plastics IP, General Electric and NASA, reflecting decades of foundational polyimide chemistry work. However, all six show zero filings in the most recent tracked year, meaning current filing activity has moved to a broader, more fragmented set of applicants. Anyone assessing freedom to operate should treat these incumbents' portfolios as a citation baseline rather than an indicator of who is actively filing today.
The dataset shows filings at 0 at the 2022 midpoint, sitting between an earlier peak of 5 in 2020 and a resumption afterward. This kind of dip-then-climb pattern is more consistent with a pause in a specific application driver — plausibly battery or flexible-circuit demand — than with the technology maturing or being abandoned. Because publication lags filing by roughly 18 months, some of the apparent 2022 gap may also reflect filings not yet published at the data cut-off.
C08G (condensation polymers) dominates with 116 of 151 records, more than double C08L (polymer compositions) at 58. Secondary classes include C08J (processing and solutions, 41), H01M (batteries, 22) and C08K (additives, 21), showing that durability claims are increasingly tied to how the polyimide is made and where it is used, not just its base composition. A new filer should check C08G prior art first, since that is where claim space is most occupied.
It is thin rather than crowded: only 151 families total, with a peak filing year of just 5 records in 2020. That said, density is uneven — C08G synthesis routes are heavily claimed while branches like hydrolytic stability additive packages, UV-stabilised circuit applications and battery-separator interfaces carry lighter IPC weight. The practical read is that base chemistry claims face dense prior art while several applied sub-branches remain comparatively open.
US20080261060A1, assigned to Ube Industries, claims a process where a polyamic acid oligomer solution with a terminal alkoxysilyl group is applied to a self-supporting polyimide precursor film before imidization, improving adhesion of the finished film. It is a process claim on pre-imidization surface chemistry, not a composition-of-matter claim on polyimide itself, so it constrains a specific adhesion-improvement route rather than the whole class of durable polyimide films. Filers targeting a different point in the process — post-imidization treatment, for instance — sit outside its literal scope.
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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.