Liquid Crystal Polymer Barrier Patents: Leaders & White Space 2026
- Filing peaked in 2020 at 21 records and has since drifted down through a 2022 midpoint of 7, a flat-to-declining trend rather than an emerging one.
- Japan leads receiving offices with 60 filings ahead of Europe (43) and the United States (37), pointing to where enforcement and freedom-to-operate checks matter most.
- The most-cited record, EP1059162A2, sits at 49 citations a packaging-laminate patent that predates most of the corpus and still anchors barrier-film prior art searches today.
What this landscape covers
Liquid crystal polymer (LCP) barrier film sits at the intersection of polymer chemistry and laminate engineering: the claims in this dataset combine thermotropic LCP resin formulation with multilayer barrier construction, targeting gas and moisture permeability low enough for food, pharmaceutical and electronics packaging, plus flexible circuit substrates. The search spans 171 patent families filed between 2015 and mid-2026, concentrated in IPC classes covering layered products, polymer processing and polymer compositions.
Publication lags filing by roughly eighteen months, so the 2025 and 2026 counts in the trend chart understate actual filing activity for those years. Read the recent downturn with that lag in mind rather than as a confirmed drop-off.
Filing trend and technology mix
Two views of the same 171-family dataset: how filing activity has moved year over year, and which IPC subclasses carry the claim density.
A 2020 peak, not a rising curve
Filings rose from 5 in 2017 to a peak of 21 in 2020, then eased to 7 by the 2022 midpoint. That shape is consistent with a technology that had a formulation and construction wave already claimed, rather than one still accelerating.
Laminate construction outweighs resin chemistry
B32B (layered products) leads at 96 records, ahead of C08J (polymer processing, 84) and C08L (polymer compositions, 82). B29C shaping and C08G condensation polymers follow at 59 each, with H05K circuit-board classifications at 34 signalling the electronics-substrate use case running alongside packaging.
Shares are the percentage of the 171 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Liquid Crystal Polymer Barrier Properties with Eureka
This page is one run against one query. Ask Eureka your own question about liquid crystal polymer barrier properties and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited barrier film patents
Thermoplastic liquid crystal polymer film, circuit board, and manufacturing methods
This Kuraray filing claims a thermoplastic LCP film tuned to a segment orientation ratio (SOR) of 0.8 to 1.4 with moisture content held at 300 ppm or below, paired with circuit board constructions — insulating substrate with conductor layer, bonding sheet, coverlay — that use the film for improved thermo-adhesion.Filed 2020-11-26 · KURARAY CO., LTD.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | EP1059162A2 | Packaging laminate having barrier properties, method of producing same and packaging containers prepared ther… | 49 |
| 2 | WO2014161653A1 | Container for a food, beverage or pharmaceutical product an method of preparation thereof | 42 |
| 3 | US6312772B1 | Multilayer laminate formed from a substantially stretched non-molten wholly aromatic liquid crystalline polym… | 39 |
| 4 | US5900292A | Liquid crystal polymer film and a method for manufacturing the same | 38 |
| 5 | US6660182B2 | Blends of stretchable liquid crystal polymers with thermoplastics | 37 |
| 6 | JP1992135750A | Composite film | 36 |
| 7 | WO1996000752A1 | Compatibilized LCP blends | 35 |
| 8 | US20030010376A1 | Outer covering for solar battery | 32 |
| 9 | US5681624A | Liquid crystal polymer film and a method for manufacturing the same | 29 |
| 10 | EP0503063A1 | Composite film | 29 |
Citation counts favour older filings simply because they have had longer to accumulate citations inside this corpus; treat them as a measure of influence on later filers, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the data implies for filing strategy
Three read-throughs from the trend, the IPC mix and the citation table, aimed at where a new filing would actually land.
The wave has already broken
A single peak year followed by a decline through the midpoint suggests the core resin-formulation and multilayer-construction claims filed early in the window. New entrants are more likely to find open space in application-specific integration than in base LCP chemistry.
Japan is the enforcement centre of gravity
With 60 receiving-office filings against 43 for Europe and 37 for the US, freedom-to-operate work for LCP barrier film should start with Japanese-held families before assuming a US-first clearance is sufficient.
Construction claims outnumber chemistry claims
B32B leads the IPC mix ahead of C08J and C08L, meaning the laminate architecture — layer order, bonding sheet, coverlay — carries more claim density than the underlying LCP resin composition itself.
Old packaging claims still anchor prior art
The most-cited record predates most of the dataset and covers general packaging laminate barrier properties, not LCP-specific chemistry — a reminder that novelty searches here need to reach back past the 2015 filing window.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to liquid crystal polymer barrier properties, with the prior art for and against each one.
Who holds the claims — and who has gone quiet
Assignee activity in this dataset shows established resin and laminate makers with no filings in the latest recorded year, consistent with the broader plateau in the filing trend.
Ticona (Celanese)
Ticona appears in the strongest co-assignee pairing in the dataset, alongside Ticona Summit LLC and named inventor Jester Randy D, pointing to a concentrated internal filing programme around LCP resin grades rather than broad external partnering.
Kuraray and the circuit-board branch
The representative filing in this dataset is a Kuraray circuit-board patent, and H05K classifications run to 34 records overall — the flexible-circuit substrate use case is a distinct, active branch from food and pharma packaging.
Denka, Sumitomo Chemical, Daicel
Denka, Sumitomo Chemical Industries and Daicel all show zero filings in the most recent recorded year, matching the dataset's post-2020 decline — worth checking whether these programmes have been discontinued, licensed out, or simply not yet published due to the reporting lag.
| Assignee | Recent year | YoY |
|---|---|---|
| Ueno Pharmaceutical Applied Research Institute Co., Ltd. | 0 | — |
| Denka Company Limited | 0 | — |
| Ticona LLC | 0 | — |
| Foster-Miller, Inc. | 0 | — |
| Sumitomo Chemical Industries, Ltd. | 0 | — |
| Daicel Corporation | 0 | — |
| Nippon Oil-Tex Co., Ltd. | 0 | — |
| Chia Sheng Technology Co., Ltd. | 0 | — |
Where to take this
Two directions depend on whether the goal is clearance or claim drafting.
Run a freedom-to-operate check centred on Japan
With 60 of the receiving-office filings routed through Japan, any product plan involving LCP barrier film should clear Japanese-held families first, not treat a US or EPO search as sufficient on its own.
Explore assignee filings in EurekaDraft around construction claims, not just resin chemistry
B32B layered-product claims outnumber C08L resin-composition claims in this dataset. A new filing focused purely on LCP formulation may still run into laminate-construction prior art it has not searched.
Search IPC classes in EurekaCommon questions on LCP barrier film patents
Thermotropic LCP resins form highly ordered molecular chains when processed, which reduces the free volume available for gas and moisture molecules to pass through. This gives LCP film lower oxygen and moisture permeability than many conventional thermoplastics at comparable thickness. In this dataset, claims often pair that resin property with a specific segment orientation ratio and controlled moisture content, as in the Kuraray representative filing, rather than relying on chemistry alone.
The dataset shows filing concentrated among established polymer and laminate makers including Ticona (part of Celanese), Kuraray, Denka, Sumitomo Chemical and Daicel, several of which show no filings in the most recent recorded year. Ticona's filings include a notable co-assignee pairing with Ticona Summit LLC, suggesting a tightly held internal programme. No single assignee dominates the full 171-family set; activity is spread across a moderate number of players rather than concentrated in one or two firms.
Not on the current data. Filings rose to a peak of 21 in 2020, then fell back to 7 by the 2022 midpoint, a flat-to-declining pattern rather than sustained growth. Publication lag of roughly eighteen months means the 2025-2026 figures are understated, so a modest uptick could still surface once those years finish publishing. Even allowing for that lag, the shape does not currently show renewed acceleration.
IPC composition shows layered-product claims (B32B, 96 records) and general polymer processing (C08J, 84) well ahead of more specific application areas. Sub-areas such as precise moisture-content control below 300 ppm, coverlay-to-circuit bonding integration, and non-polyester thermoplastic blend interfaces show thinner filing density relative to the core resin and laminate claims, making them plausible entry points for new filings that avoid the densest prior art clusters.
That Kuraray filing claims a specific combination: a thermoplastic LCP film with a segment orientation ratio between 0.8 and 1.4, moisture content at or below 300 ppm, used in defined circuit-board constructions such as bonding sheets and coverlays. It does not block LCP barrier film generally, only implementations that fall inside that SOR range and moisture threshold in a circuit-board context. Packaging-only applications outside the circuit-board claims, or films outside the stated SOR and moisture bounds, sit outside its literal scope, though a full clearance opinion would need to check dependent claims and file history.
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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.