Barrier Coatings for Paper Packaging Patents: Leaders & White Space 2026
- Filing activity peaked in 2023 at 169 records and the 2021-to-2024 span shows an 18% pullback, though 2025-2026 counts are still filling in as publication catches up with filing.
- The top 5 assignees hold 30.6% of all 1,560 records while the top 10 combined reach 45.4% — concentrated at the front, with a long tail of single- and few-filing entrants behind.
- Layered-product claims (B32B) touch 54.9% of records far ahead of pulp and paper composition claims (D21H, 39.9%), showing where claim space is already dense versus where it is thinner.
Filing growth compares 2021 (152 records) with 2024 (124) — 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 1,560 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Barrier coatings for paper packaging sit at the intersection of polymer chemistry and fibre-based substrates: formulations and laminate structures designed to block grease, water vapour or oxygen while keeping the paper substrate repulpable or heat-sealable. The search set spans 1,560 published records from 2015 through the 2026 cut-off, built around functional test language — kit test ratings, pinhole defects, coat weight control — rather than chemistry alone, so it captures both coating formulations and the laminate constructions built around them.
Filing runs across eight IPC subclasses, from layered-product claims (B32B) and pulp/paper compositions (D21H) down to narrower polymer-processing and coatings classes. Receiving-office activity is led by Europe and the United States, with a meaningful PCT filter and smaller but active dockets in Australia, Canada and Japan — a spread consistent with a packaging technology sold globally but engineered regionally around substrate and recycling rules.
Filing trend and technology composition
Two views of the same 1,560-record set: how filing activity has moved year over year, and which IPC subclasses carry the claim weight today.
Filing trend, 2017-2026
Annual filings rose from 51 in 2017 to a peak of 169 in 2023. The 2021-to-2024 window shows a documented -18% move (152 to 124); years after 2024 are still incomplete because publication typically lags filing by around 18 months, so the apparent tail-off in 2025-2026 understates real activity rather than confirming a slowdown.
Technology composition by IPC subclass
B32B (layered products) appears on 54.9% of the 1,560 records and D21H (pulp and paper compositions) on 39.9%, with B65D packaging claims close behind at 33.8%. Because a single record can carry several IPC codes, these shares add up past 100% — they describe where claim density sits, not a partition of the field.
Shares are the percentage of the 1,560 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Barrier Coatings for Paper Packaging with Eureka
This page is one run against one query. Ask Eureka your own question about barrier coatings for paper packaging and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited records
Curtain-coated polyvinyl alcohol oil and grease barrier films
A method of providing an oil and grease resistant coating to a substrate includes curtain coating at least one surface with an aqueous polyvinyl alcohol composition to form a nascent barrier film, then drying it so the resulting coating is substantially pinhole free.US20060099410A1, filed by Miller, Gerald D., published 2006-05-11.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20100288131A1 | Mineral Composite Beverage Brewing Cup and Cartridge | 361 |
| 2 | US8474368B2 | Mineral composite beverage brewing cup and cartridge | 338 |
| 3 | US6183814B1 | Coating grade polylactide and coated paper, preparation and uses thereof, and articles prepared therefrom | 230 |
| 4 | US5759648A | Multilayer plastic film, useful for packaging a cook-in foodstuff | 181 |
| 5 | US6787245B1 | Sulfonated aliphatic-aromatic copolyesters and shaped articles produced therefrom | 172 |
| 6 | US5248720A | Process for preparing a polyamide composite material | 166 |
| 7 | US4376799A | Quiet film and container | 140 |
| 8 | US4322465A | Clear, autoclavable, sealed container having good water vapor barrier properties and flex crack resistance | 128 |
| 9 | US5084356A | Film coated with glass barrier layer with metal dopant | 126 |
| 10 | WO2014113562A1 | Quantum dot film | 119 |
Citation counts favour older filings simply by virtue of time in the corpus; treat them as a signal of influence on later work, not as a ranking of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Read together, the concentration figures, the IPC mix and the citation list point to a field with dense claim coverage on laminate structures and a comparatively open middle layer of coating chemistry.
A crowded front, a long tail behind it
The leader alone accounts for 193 records, and the gap down to fifth place (56) and tenth place (39) is steep. Below the ranked leaders sits a long tail of single- and few-filing entrants, which is typical of a field built around incremental formulation and process claims rather than one dominant platform patent.
A pullback from a 2023 peak, not a collapse
Annual filings climbed for years before peaking at 169 in 2023, then eased to 124 by 2024 — an 18% step down over that three-year window. Counts for 2025 and 2026 look lower still, but that reflects publication lag rather than a real drop in filing activity.
Laminate structure claims dominate coating-chemistry claims
Layered-product claims (B32B) touch more than half of all records, while coatings-specific claims under C09D sit under 12%. That gap suggests structural and multilayer claims are the more contested ground, with formulation-level coatings claims comparatively less crowded.
Older mineral-composite and copolyester patents still anchor citation chains
The most-cited records in this corpus date to the 2000s and 2010s and cover mineral-composite cups and aliphatic-aromatic copolyester films — evidence of foundational influence, not current filing activity. New entrants should expect examiners to cite this older art regardless of how recent their own filing is.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to barrier coatings for paper packaging, with the prior art for and against each one.
Who is filing, and where the gate sits
Recent-year momentum figures show several previously active filers dropping to zero in the latest year, which is consistent with the field's broader 2021-to-2024 pullback rather than a signal that any single company has exited.
A clear front-runner, well ahead of fifth place
The leading assignee's 193 records sit well above fifth place at 56, a gap wide enough to suggest a deliberate, sustained filing programme rather than opportunistic filing around a single product line.
Multiple established filers show zero latest-year output
Several assignees that were active in prior years show zero filings in the latest year tracked, with year-over-year drops as steep as -100%. Given the 18-month publication lag, this is best read as an incomplete latest year rather than firms stepping back from the space.
Joint filing is the exception, not the rule
Only ten co-assignee pairs appear across 1,560 records, and the strongest pair reaches ten joint filings. Most patenting in this field is done by a single assignee acting alone, with joint R&D or corporate-affiliate filing the exception.
| Assignee | Recent year | YoY |
|---|---|---|
| Toppan Holdings Inc. | 2 | -60% |
| Stora Enso Oyj | 0 | -100% |
| Kemira Oyj | 0 | -100% |
| Dai Nippon Printing Co., Ltd. | 0 | -100% |
| Baxter International Inc. | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| Sun Chemical Corporation | 0 | — |
| Curwood, Inc. | 0 | — |
Where to take this next
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, licensing, or identifying open filing space.
Check freedom-to-operate on laminate structure claims
With B32B claims touching 54.9% of records, any new multilayer barrier construction should be checked against the leading assignees' laminate claim sets before committing to a structure.
Run a freedom-to-operate search in EurekaMap the under-claimed coating-chemistry middle layer
C09D-specific coating chemistry claims sit under 12% of records, well below the laminate and pulp-composition classes, suggesting more room for formulation-level filing than for structural claims.
Explore white space in EurekaCommon questions on this landscape
One assignee leads clearly with 193 records in this dataset, well ahead of the fifth-ranked filer at 56. The top 5 assignees together account for 30.6% of all 1,560 records in scope, and the top 10 reach 45.4%, so filing is concentrated at the front but far from monopolised — a long tail of smaller filers accounts for the rest. Anyone assessing competitive position should look at both the leader's portfolio and the shape of that tail, since a crowded top does not mean the whole field is closed.
Filings rose for years and peaked at 169 in 2023, then the documented 2021-to-2024 window shows a -18% move, from 152 down to 124. Numbers for 2025 and 2026 appear lower still, but publication typically lags actual filing by around 18 months, so those recent years are not yet a reliable read on real activity. Treat 2024 as the most recent complete year and expect the true 2025-2026 counts to revise upward as more records publish.
Layered-product and laminate claims under IPC class B32B appear on 54.9% of the 1,560 records, making them the single most claimed technology area, followed by pulp and paper composition claims (D21H) at 39.9% and packaging/container claims (B65D) at 33.8%. Coating-specific chemistry under C09D sits much lower, at 11.9%. Because records often carry multiple IPC codes, these figures describe claim density across the field rather than a clean split of where all the filing sits.
US20060099410A1 describes a curtain-coating process that applies an aqueous polyvinyl alcohol composition to a substrate to form a pinhole-free oil and grease barrier film, with the coating and drying conditions specifically controlled to eliminate pinhole defects. It is process-specific to curtain coating and to polyvinyl alcohol chemistry, so it does not automatically block barrier coatings applied by other methods or built on other polymer systems. Anyone working with curtain-coated PVOH grease barriers specifically should review its claims closely before finalising a coating station design.
The technology composition data shows coating-chemistry claims under C09D at only 11.9% of records and addition-polymer claims under C08F at 4.7%, both well below the density seen in laminate structure and pulp-composition classes. That gap points to more open filing room in formulation-level barrier chemistry and in bio-based or dispersion coating approaches than in structural laminate claims, where the leading assignees already hold dense coverage. Confirming this requires a targeted freedom-to-operate search rather than relying on IPC shares alone.
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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.
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