Barrier Resins for Rigid Packaging Patents: Leaders & White Space 2026
- Filing has plateaued, not grown. Filings peaked at 38 in 2023 after climbing from 16 in 2017; the 2022 midpoint of just 6 shows the run-up was late and short-lived.
- Layered-laminate claims dominate the IPC mix. B32B appears in 403 of 452 families, meaning almost every filing routes through multilayer construction rather than resin chemistry alone.
- The most-cited prior art predates the current filing wave by decades. The top-cited record, US4818575A, has 250 citations and dates to the biaxially-drawn polyester vessel era, a reminder that today's claims sit on old, heavily-trodden ground.
What this landscape covers
Barrier resins for rigid packaging sit at the intersection of polymer chemistry and container engineering: EVOH and PVDC-alternative compositions engineered for oxygen permeability, humidity sensitivity, coextrusion compatibility, retort resistance and, increasingly, recyclability. The dataset spans 452 patent families filed between 2015 and mid-2026, indexed under polymer composition classes (C08L, C08J, C08K) alongside packaging and lamination classes (B32B, B65D, B29C). Because publication lags filing by roughly 18 months, the 2025-2026 counts in any trend line understate real filing activity.
The claim landscape is dominated by multilayer container and film constructions rather than standalone resin claims, which tells a practitioner that most commercially defensible positions combine a barrier layer with specific coextrusion or lamination parameters, not chemistry in isolation.
Filing trend and technology composition
The filing curve and the IPC mix together show a field that grew in bursts, cooled after 2023, and remains anchored in laminate construction rather than pure resin chemistry.
A short, late run-up followed by decline
Filings rose from 16 in 2017 to a peak of 38 in 2023, but the 2022 midpoint of 6 shows most of that growth arrived in a narrow window rather than building steadily. The drop toward the 2026 partial-year count is expected given publication lag, but the pattern since the 2023 peak points to a market that has stopped accelerating.
Laminate and container classes lead over pure resin classes
B32B (layered products) appears in 403 of 452 families and B65D (containers) in 254, versus 120 for C08L (polymer compositions) and 96 for C08J (polymer processing). Claims concentrated this heavily in construction classes mean freedom-to-operate analysis has to clear laminate and container art even for a filing framed as a resin chemistry innovation.
Shares are the percentage of the 452 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Barrier Resins for Rigid Packaging with Eureka
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Try EurekaThe prior art everyone in this space cites
Gas-barrier resin composition and its use (EP3660105A1)
Showa Denko's filing claims a gas-barrier resin composition combining a gas-barrier resin with an oxygen permeability coefficient of 1.0×10⁻¹⁴ (cm³·cm/cm²·s·Pa) or less and a defined copolymer built from three specified monomer structural units. The claim ties a quantitative oxygen-barrier threshold to a specific copolymer architecture rather than to a broad resin family.Filed by SHOWA DENKO K.K., published 2020-06-03.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4818575A | Biaxially drawn polyester vessel having resistance to heat distortion and gas barrier properties and process … | 250 |
| 2 | US5153038A | Plastic multi-layer vessel | 204 |
| 3 | US4960639A | Multilayered container | 130 |
| 4 | US4816308A | Multilayered container | 122 |
| 5 | US5942320A | Barrier composite films and a method for producing the same | 119 |
| 6 | EP0590263A2 | Gas barrier resin composition and process for producing the same | 105 |
| 7 | US4182457A | Multilayer container | 101 |
| 8 | US5700560A | Gas barrier resin composition and its film and process for producing the same | 97 |
| 9 | US4983432A | Ethylene vinyl alcohol copolymers containing platelet-type mica fillers of multi-layer containers | 87 |
| 10 | US4728549A | Multilayered container | 75 |
Citation counts favour older filings simply by virtue of time in the corpus; treat them as a measure of foundational influence, not current relevance.
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Three patterns matter more than the raw counts: where the claim density sits, how recent activity has moved, and how concentrated citation influence is among a handful of decades-old records.
Multilayer construction, not resin alone, carries the claims
Nearly every family in the corpus touches layered-product classification even when the invention is framed as a resin chemistry advance. A standalone resin composition claim without a defined layer structure is filing into thin, already-explored space.
The growth window has already closed
Filings rose sharply into 2023 and have not sustained that pace since; several leading assignees show zero filings in the latest year and negative year-on-year momentum. That is consistent with either consolidation of existing positions or a genuine slowdown in new inventive activity.
Foundational art is old and heavily cited
The most-cited record, a biaxially-drawn polyester vessel patent, dates from the late 1980s and still anchors the field's citation graph. New filings are built on top of, not instead of, this older multilayer-container art.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to barrier resins for rigid packaging, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Kuraray Co., Ltd. | Cryovac, Inc. | 7 |
| Kuraray Co., Ltd. | Bridgestone Corporation | 3 |
| Nippon Synthetic Chemical Industry Co., Ltd. | Mitsubishi Chemical Corporation | 2 |
| Toyo Seikan Group Holdings, Ltd. | KUWABARA YASUNAGA | 1 |
Only 4 co-assignee pairs appear in the dataset, the strongest linking Kuraray and Cryovac at 7 shared families, which suggests most inventive work here is done in-house rather than through joint development.
Who holds the claim space, and where it is thin
Filing activity concentrates among a small group of Japanese materials and packaging firms, several of which show no filings at all in the most recent year. That flat momentum, combined with the classification data, points to specific sub-areas still open for a first-mover claim.
Leaders have gone quiet in the newest data
Kuraray, Mitsubishi Gas Chemical, Toyo Seikan, Dai Nippon Printing, Toyobo and Sumitomo Chemical all show zero filings in the latest year, several with -100% year-on-year change. Given publication lag, this may partly reflect filings still working through the pipeline rather than a genuine stop.
Kuraray and Cryovac lead the only meaningful collaboration
The Kuraray-Cryovac pairing is the strongest co-assignee link in the dataset; a smaller link between Kuraray and Bridgestone and one between Nippon Synthetic Chemical and Mitsubishi Chemical round out the remaining activity. Co-filing overall is uncommon here.
Europe and Japan lead the receiving-office mix
EPO filings (140) and Japan filings (112) outpace the United States (87), with Canada, WIPO and Austria each in single-digit-to-low-double-digit ranges. A freedom-to-operate check limited to the US misses most of the corpus.
| Assignee | Recent year | YoY |
|---|---|---|
| Kuraray Co., Ltd. | 0 | -100% |
| Mitsubishi Gas Chemical Company, Inc. | 0 | — |
| Toyo Seikan Group Holdings, Ltd. | 0 | — |
| Dai Nippon Printing Co., Ltd. | 0 | -100% |
| Toyobo Co., Ltd. | 0 | — |
| Sumitomo Chemical Co., Ltd. | 0 | — |
| Zeon Corporation | 0 | — |
| Nippon Synthetic Chemical Industry Co., Ltd. | 0 | — |
Where to take this analysis
The landscape data points to specific next steps depending on whether the goal is freedom-to-operate, licensing, or new filing strategy.
Run a freedom-to-operate check against the laminate classes
Because 403 of 452 families sit under B32B, any new filing needs clearance against layered-product art, not just resin composition art, before development spend goes further.
Explore in Patsnap EurekaWatch for pipeline filings from quiet leaders
Several major assignees show zero filings in the latest year; publication lag means some of that activity may surface over the next 12-18 months and change the competitive picture.
Track assignee activity in Patsnap EurekaTest claims against the under-claimed branches
Mono-material recyclable barriers and humidity-triggered permeability are comparatively thin in filing density and worth a targeted prior-art search before drafting.
Search white space in Patsnap EurekaCommon questions on barrier resin patents
EVOH (ethylene vinyl alcohol) is the incumbent oxygen-barrier resin and is claimed heavily in copolymer and layer-structure combinations across this dataset. PVDC-alternative claims are typically framed as replacements addressing recyclability and coextrusion compatibility concerns associated with chlorinated resins. Most filings covering either chemistry are indexed under the same layered-product (B32B) classes, meaning the commercial claim usually protects a specific multilayer construction rather than the resin alone. A practitioner comparing the two should check both the resin composition class (C08L) and the container/laminate classes together.
Filing activity concentrates among Japanese materials and packaging manufacturers, several of which appear repeatedly across the assignee ranking and momentum data, including Kuraray, Mitsubishi Gas Chemical, Toyo Seikan, Dai Nippon Printing, Toyobo and Sumitomo Chemical. Several of these show zero filings in the most recent year with negative year-on-year change, which given publication lag may understate current activity. Co-filing is rare in this space, with only four co-assignee pairs recorded, the strongest being Kuraray and Cryovac.
The filing trend climbed from 16 filings in 2017 to a peak of 38 in 2023, then declined toward the most recent partial year. Part of that decline is a publication-lag artifact, since patents filed in 2025-2026 typically have not published yet at this data cut-off. But the pattern since the 2023 peak, combined with several leading assignees showing zero recent filings, suggests genuine cooling in new inventive activity rather than only a reporting gap.
EP3660105A1, filed by Showa Denko and published in 2020, claims a gas-barrier resin composition combining a resin with an oxygen permeability coefficient at or below 1.0×10⁻¹⁴ (cm³·cm/cm²·s·Pa) with a copolymer built from three specifically defined monomer structural units. The claim ties a quantitative barrier performance threshold to a defined copolymer architecture, which narrows its scope to compositions matching both the permeability figure and the monomer structure rather than covering gas-barrier resins broadly. Anyone designing a competing composition should check whether their resin's measured permeability and copolymer structure fall inside that defined window.
The classification data shows heavy concentration in layered-laminate and EVOH-based multilayer claims, with comparatively thinner coverage in areas such as post-consumer recyclable mono-material barrier layers, humidity-triggered permeability switching, and retort-stable barrier formulations that do not rely on EVOH. These branches sit adjacent to the dense core rather than outside the dataset entirely, so a new filing there still needs to be checked against the broader laminate art before assuming it is genuinely open.
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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.