Polyimide Scale-Up Patents: Leaders, Trends & White Space 2026
- Filing has cooled since a 2019 peak. 13 families filed that year against a flat 2022 midpoint of 9, suggesting the core continuous-casting and tenter-process claim space is largely staked out rather than still expanding.
- China dominates the receiving-office split. 105 of the tracked filings route through China, well ahead of Europe (26) and the United States (19), which tells you where freedom-to-operate checks matter most for scale-up hardware.
- The oldest cited patents still carry the most weight. A pair of 1989 Japanese filings on thermal dimensional stability out-cite every later record, a sign that foundational film-property claims, not new casting hardware, remain the reference point examiners return to.
What this landscape covers
This landscape tracks patent families at the intersection of polyimide film chemistry and the continuous manufacturing methods used to scale it: continuous film casting, roll-to-roll imidization and tenter-frame stretching, filtered against IPC classes for polymer processing, film shaping and condensation-polymer composition. It captures 172 families published between 2015 and mid-2026, spanning the material science of the polyimide itself and the mechanical process that turns lab-scale resin into commercial-width film.
Because publication typically lags filing by around 18 months, the 2025-2026 filing counts in the trend chart are necessarily incomplete and should be read as a floor, not a ceiling, on current activity.
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Filing trend and technology composition
Two views of the same 172-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the claim weight.
Filings rose to a 2019 peak, then flattened
From 2 families in 2017, filings climbed to a peak of 13 in 2019, then settled to a midpoint of 9 by 2022. That flat-to-declining pattern after an early peak is typical of a process technology whose core mechanical claims (casting, stretching, imidization sequencing) were staked out early, with later filings concentrated on incremental film-property and additive claims rather than new production architectures.
Condensation chemistry outweighs the machinery
C08G (condensation polymers) appears in 147 of 172 records and C08J (polymer processing) in 103, far ahead of B29C (plastics shaping, 9 records) or B32B (laminates, 13). The imbalance suggests most applicants are claiming the polyimide chemistry that survives continuous processing, not the casting or tenter equipment itself — equipment claims are the thinner, more open layer of this landscape.
Shares are the percentage of the 172 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Polyimide Scale-Up and Mass Production with Eureka
This page is one run against one query. Ask Eureka your own question about polyimide scale-up and mass production and every answer comes back with the patent numbers behind it.
Try EurekaThe records this field cites most
US7691961B2 — Polyimide film and use thereof (Kaneka Corporation)
A polyimide film in which the dimensional change is reduced when it has undergone a step of laminating a metal on the polyimide film or a step of etching the metal layer to form wiring, and the rate of dimensional change can be stabilized across the entire width. The film is produced by a continuous process in which coefficients of linear expansion measured along and perpendicular to the molecular orientation axis satisfy a defined relationship across the entire film width.Granted 2010-04-06; the claim scope centres on width-uniform dimensional stability in continuously processed film, a property claim that reaches beyond any single casting line design.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | JP1989131241A | Polyimide of high dimensional stability to heat | 76 |
| 2 | WO2012011970A1 | Matte finish polyimide films and methods relating thereto | 53 |
| 3 | WO2011017291A1 | Matte finish polyimide films and methods relating thereto | 47 |
| 4 | JP1989131242A | Polyimide having excellent thermal dimensional stability | 34 |
| 5 | CN102875835A | 一种聚酰亚胺多孔膜及其制备方法 | 24 |
| 6 | CN102604093A | 聚酰亚胺的制备方法 | 23 |
| 7 | CN105968354A | 一种CO<sub>2</sub>吸附用聚酰亚胺气凝胶的制备方法 | 19 |
| 8 | US20150344625A1 | Polyimide film, method of preparing polyimide film, optical device including polyimide film | 19 |
| 9 | US4405550A | Manufacture of polyimide film by solvent casting | 18 |
| 10 | US20020010311A1 | Polyimide composition having improved peel strength when clad | 17 |
Citation counts favour older records simply because they have had longer to accumulate citations within this searched corpus; treat them as a marker of influence on later filings, not of current commercial relevance.
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 numbers mean for a filing decision
Four read-outs from the trend, geography and citation data that matter more for strategy than the raw counts alone.
The growth phase has already passed
Filing peaked at 13 families in 2019 and had eased to a midpoint of 9 by 2022, well before the 18-month publication lag affects the most recent years. A technology that peaks and flattens rather than keeps climbing usually means the core process claims are settled and later entrants are filing around the edges.
China is the primary battleground
China accounts for 105 of the tracked filings, more than four times the United States (19) and well ahead of Europe (26). Any freedom-to-operate review for a scale-up line destined for a Chinese fab should weight this jurisdiction first, not treat it as secondary to US or EPO filings.
Chemistry claims outnumber process-hardware claims
Condensation-polymer chemistry (C08G) and polymer processing (C08J) dominate the classification mix, while shaping equipment (B29C, 9 records) is comparatively thin. That gap is where mechanical and line-integration claims have more room to be filed without running into dense prior art.
Old foundational patents still anchor the field
The most-cited record in this corpus is a 1989 Japanese filing on thermal dimensional stability, cited 76 times — more than any filing from the last decade. New entrants are still designing against decades-old property claims, not against recent casting-line patents.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to polyimide scale-up and mass production, with the prior art for and against each one.
Who is filing, and how concentrated is it
Co-assignee pairings and recent-year momentum both point to a landscape with a small set of anchor filers and a long tail of single-filing entrants, most of whom have gone quiet in the latest tracked year.
Donghua University and Shanghai Ruitu Electronic Materials
The strongest co-assignee pair in this dataset links a university and a specialty electronic-materials maker, with 22 shared filings — the deepest and most durable collaboration in the corpus, though recent-year momentum has dropped to zero for both.
Changchun Gaoqi Polyimide Materials and Ding Mengxian
A named inventor filing alongside a dedicated polyimide-materials manufacturer accounts for 6 shared filings, suggesting a founder-led or closely held filing pattern rather than a diffuse corporate R&D group.
The historically dominant filers have paused
Every one of the assignees with the strongest historical filing counts, including the leading academic-industry pair, shows zero filings in the latest tracked year. That is consistent with the flattening trend line and points to either a maturing claim set or a lag in publication rather than a genuine drop in R&D.
| Assignee | Recent year | YoY |
|---|---|---|
| Donghua University | 0 | -100% |
| Shanghai Ruitu Electronic Materials Co., Ltd. | 0 | — |
| E.I. du Pont de Nemours and Company (USA) | 0 | — |
| Changchun Gaoqi Polyimide Materials Co., Ltd. | 0 | — |
| Mobil Oil Corporation | 0 | — |
| DING MENGXIAN | 0 | — |
| Occidental Chemical Corporation | 0 | — |
| Governing Council of the University of Toronto | 0 | — |
Where to take this analysis
The dataset points to a landscape with settled core chemistry claims and open process-hardware space. Two directions make sense from here.
Map freedom-to-operate against the chemistry claims
With C08G and C08J claims covering the majority of records, a targeted clearance search on the specific film-property parameters you need — rather than the casting method — will surface the real blocking art faster.
Explore this in EurekaTrack the quiet leaders for renewed filing
Several historically dominant assignees show zero filings in the latest year. A watch on their portfolios will show whether that is a genuine pause or a publication-lag gap about to resolve.
Set up monitoring in EurekaCommon questions on this landscape
The most-cited records in this corpus are decades-old Japanese filings from the late 1980s covering thermal dimensional stability, alongside later filings on matte-finish polyimide films. Chinese institutions and materials companies account for the largest share of recent filing volume, with China representing 105 of the 172 tracked receiving-office filings. No single assignee dominates outright; the field shows a concentrated set of academic-industry co-filing pairs alongside a long tail of single-filing entrants.
Filing activity peaked at 13 families in 2019 and had eased to a midpoint of 9 by 2022, indicating a flat-to-declining trend rather than continued growth. Because publication lags filing by roughly 18 months, the 2025-2026 figures understate true recent activity, but the overall trajectory through the last fully reported years points to a maturing rather than expanding filing pace. New entrants should expect denser prior art on core process claims and more room on peripheral hardware and application-specific claims.
The IPC composition shows chemistry classes (C08G, C08J, C08L) heavily outweighing shaping-equipment classes like B29C, which has only 9 records against 147 for condensation-polymer chemistry. That imbalance suggests line-integration hardware, oven staging for roll-to-roll imidization, and width-control systems for tenter stretching are comparatively under-claimed relative to the film chemistry itself. Application-specific ties, such as battery-grade separator processing, also show thinner coverage than the core material claims.
China is the dominant receiving office by a wide margin, with 105 of the 172 tracked filings, compared with 19 in the United States and 26 through the European Patent Office. Any clearance review for a production line intended for a Chinese facility should prioritise the Chinese filings first. That said, the US and EPO filings include some of the most heavily cited records in the corpus, so they cannot be skipped entirely for global product launches.
US7691961B2, assigned to Kaneka Corporation, claims a polyimide film produced by a continuous process where the coefficients of linear expansion along and perpendicular to the molecular orientation axis satisfy a defined relationship across the entire film width. It is a property claim tied to width-uniform dimensional stability rather than a claim on any specific casting apparatus. That framing means it can reach film products meeting the stated CTE relationship regardless of which continuous process produced them, so anyone targeting width-uniform low-CTE film for metal lamination or etching applications should check this claim's scope directly rather than assuming a different casting method avoids it.
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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.