Optical Adhesives Patents: Who Leads, Filing Trends 2026
- Filing activity has cooled sharply since its 2017 peak of 23 filings, with the 2022 midpoint down to just 2 — a long way from a growth story.
- Adhesive chemistry claims dominate over device integration, with C09J appearing in 90 of 96 families against 21 for G06F, meaning the fight is over formulation, not touch-panel assembly.
- A single co-assignee pair anchors the collaboration graph, Henkel's IP holding entity and its operating company sharing 10 co-filings — an order of magnitude above any other pairing.
Filing growth compares 2021 (1 records) with 2024 (4) — 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.
What this landscape covers
Optically clear adhesives (OCAs) and optical bonding films sit at the junction of display assembly and specialty adhesive chemistry. This landscape tracks 96 patent families published between 2015 and mid-2026 that claim optically clear adhesive compositions, optical bonding films, or OCA film constructions, filtered to documents that also address practical bonding problems: refractive index matching, bubble-free lamination, yellowing resistance, reworkability and step coverage.
The dataset spans IPC classes centred on C09J (adhesives) and B32B (layered products), with a meaningful secondary cluster in display and touch-panel integration (G06F, G02F, G09F). Receiving-office activity is led by the United States and the EPO, with WIPO PCT filings a distant third — a filing pattern consistent with a mature, consolidation-phase field rather than one still expanding into new jurisdictions.
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Filing trend and technology mix
Two views of the same 96-family dataset: how filing volume has moved over time, and how those families distribute across IPC subclasses.
A field past its filing peak
Filings ran to a peak of 23 in 2017 and have declined since, with the 2022 midpoint at just 2 records. Because publication lags filing by roughly 18 months, the final one or two years understate true activity — but the trajectory from 2017 onward is unambiguous decline, not a temporary dip.
Adhesive chemistry outweighs device integration
C09J (adhesives) appears in 90 of 96 families and B32B (laminates) in 51, against 21 for G06F (digital data processing, largely touch-panel integration) and 12 for G02F (optical control). The claim contest here is centred on the adhesive layer itself — composition, curing and optical properties — rather than how it is engineered into a finished display stack.
Shares are the percentage of the 96 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Optical Adhesives and Bonding Films with Eureka
This page is one run against one query. Ask Eureka your own question about optical adhesives and bonding films and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art
US20190194498A1 — Optically clear adhesive sheet and bonding method (Bando Chemical Industries)
The present invention provides an optically clear adhesive sheet capable of reducing peeling after bonding due to causes such as outgassing and having excellent environment resistance, using a polyurethane that has excellent flexibility and is capable of giving a thick film. The optically clear adhesive sheet contains a polyurethane, the polyurethane being a cured product of a polyurethane composition containing a polyol component and a polyisocyanate component, the polyisocyanate component including a hydrophilic polyisocyanate, the optically clear adhesive sheet having a moisture content of 400 ppm or lower as measured by a Karl Fischer method.Filed by Bando Chemical Industries, published 2019-06-27. Ties peeling resistance and outgassing performance to a specific polyurethane chemistry and a measurable moisture-content threshold.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | WO2016008130A1 | Photo-curable liquid optically clear adhesive composition and use thereof | 37 |
| 2 | US20150210042A1 | Heat de-bondable adhesive articles | 32 |
| 3 | WO2014018312A1 | Heat de-bondable adhesive articles | 30 |
| 4 | US20170145267A1 | Optically clear hot melt adhesives and uses thereof | 28 |
| 5 | US20170121562A1 | Photo-curable liquid optically clear adhesive composition and the use thereof | 27 |
| 6 | WO2016025965A1 | Optically clear hot melt adhesives and uses thereof | 25 |
| 7 | CN109536051A | 一种低介电OCA光学胶、光学胶膜及其膜制备方法 | 21 |
| 8 | WO2013049133A1 | Method of coating liquid optically clear adhesives onto rigid substrates | 19 |
| 9 | US9169422B2 | Method of coating liquid optically clear adhesives onto rigid substrates | 17 |
| 10 | EP3500639A1 | Multi-layer, optically clear adhesives with slip layer | 14 |
Citation counts are drawn from the searched corpus and skew toward older filings; treat them as a signal of influence on later filers, not of current commercial weight.
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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Three read-outs from the filing trend, technology mix and citation data that matter for anyone deciding where to file or license next.
Growth has stalled, not accelerated
The 2017 peak of 23 filings has not been approached since; the 2022 midpoint sits at 2. Even allowing for publication lag understating the last year or two, this is a field where the core chemistry claims were staked out early and filing has tapered rather than built.
The contest is chemistry, not integration
C09J and B32B dominate the IPC mix while G06F and G02F — the display and optical-control classes — trail well behind. Freedom-to-operate risk concentrates in adhesive formulation and lamination construction, not in how the film is fitted into a touch panel or display module.
Early photo-curable OCA filings still anchor the field
The most-cited records date to 2014–2017 and centre on photo-curable liquid OCA compositions and heat de-bondable adhesive articles. Their citation weight reflects age and searched-corpus visibility as much as present-day relevance, but they remain the prior art new filers are measured against.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to optical adhesives and bonding films, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Henkel IP & Holding GmbH | Henkel AG & Co. KGaA | 10 |
| 3M Innovative Properties Company (USA) | ROTTO NELSON T | 2 |
| 3M Innovative Properties Company (USA) | LE JOHN D | 2 |
| 3M Innovative Properties Company (USA) | FITZER ROBERT C | 2 |
| Guangzhou Lushan New Material Co., Ltd. | Guangzhou Lushan Xingbang Optical Material Co., Ltd. | 2 |
| ROTTO NELSON T | LE JOHN D | 2 |
| ROTTO NELSON T | FITZER ROBERT C | 2 |
| 3M Innovative Properties Company (USA) | TAPIO SCOTT M | 1 |
Only 10 co-assignee pairs appear across 96 families, and one pairing — Henkel's IP-holding entity with its operating company — accounts for 10 co-filings on its own. Outside that pairing, collaboration is essentially absent; this is a field of solo filers, not joint ventures.
Who holds the ground
Recent-year momentum across the tracked assignees is flat: every leading filer, including Bando Chemical, 3M, Henkel's two entities, ITRI and Everix, shows zero filings in the most recent year, with Everix additionally recording a -100% year-on-year drop. That flatness is consistent with the overall filing decline rather than any single company retreating from the space.
Henkel's dual-entity filing structure
Henkel's IP-holding company and its operating entity co-file together far more than any other pair in the dataset, a structure that concentrates and consolidates its optical adhesive claim portfolio under coordinated ownership.
Bando Chemical's polyurethane OCA sheet line
Bando's representative filing on polyurethane-based OCA sheets with controlled moisture content illustrates a materials-engineering approach to outgassing and peel resistance, though its recent filing activity has gone quiet along with the rest of the field.
3M's broad but slowing footprint
3M appears across multiple co-assignee pairings with individual inventors, suggesting a broad internal filing programme rather than a single flagship product line, but like its peers shows no filings in the most recent tracked year.
| Assignee | Recent year | YoY |
|---|---|---|
| Bando Chemical Industries, Ltd. | 0 | — |
| 3M Innovative Properties Company (USA) | 0 | — |
| Henkel IP & Holding GmbH | 0 | — |
| Henkel AG & Co. KGaA | 0 | — |
| Industrial Technology Research Institute (ITRI) | 0 | — |
| Everix, Inc. | 0 | -100% |
| Shenzhen Baoli New Material Co., Ltd. | 0 | — |
| Guangzhou Lushan New Material Co., Ltd. | 0 | -100% |
Where to take this
The filing trend and claim concentration point to a field where the core chemistry is well staked but several integration and durability problems remain thinly claimed.
Map freedom-to-operate against the C09J cluster
Before filing new optical adhesive claims, run a focused search against the C09J and B32B records identified here — that is where 90% of the claim density sits.
Explore in EurekaTrack the quiet assignees for renewed activity
Every leading filer shows zero filings in the most recent year; a renewed filing from any of them would be an early signal worth monitoring rather than an anomaly to dismiss.
Set up monitoring in EurekaTest the white-space branches for a first claim
Reworkable debonding triggers and step coverage on textured panels show thin filing density relative to core chemistry — worth a validation search before committing R&D.
Run a white-space search in EurekaCommon questions on optical adhesive patents
In this dataset, an optically clear adhesive is claimed as an adhesive composition or film with defined optical transmission and low haze, typically formulated for lamination between display layers such as touch panels, cover glass and LCD/OLED stacks. Claims in this space most often sit in IPC class C09J (adhesives) combined with B32B (layered products), and frequently specify a curing mechanism — photo-curable liquid systems and heat de-bondable formulations are among the most cited approaches. The practical differentiators claimed alongside optical clarity are refractive index matching, resistance to yellowing under UV or heat exposure, and reworkability, meaning the film can be removed and replaced without damaging the display stack.
Filing volume in this dataset peaked at 23 records in 2017 and fell to just 2 by the 2022 midpoint, a pattern typical of a field where the foundational chemistry claims were filed early and later filers found less open space to claim around. It does not necessarily mean R&D activity has stopped — display and adhesive companies may be relying on trade secrets, or filing incremental improvements that fall outside this search's specific claim terms. Readers should also account for publication lag: since publication trails filing by roughly 18 months, the most recent one to two years in any patent trend will understate true filing activity until later data cuts catch up.
The dataset's assignee ranking is led by a small group of specialty adhesive and materials companies, with Henkel's IP-holding entity and its operating company forming the strongest collaboration pair in the dataset at 10 co-filings — well above any other pairing. Bando Chemical, 3M, and Taiwan's Industrial Technology Research Institute (ITRI) also appear among the more active filers. Notably, every one of the leading assignees shows zero filings in the most recent tracked year, indicating the whole field's filing pace has slowed rather than leadership shifting from one company to another.
Relative to the dense core cluster of adhesive-composition claims under C09J, several adjacent technical problems show thinner filing density: reworkable debonding triggers that allow clean removal without residue, step coverage over textured or notched panel edges, low-yellowing formulations aimed at outdoor and automotive exposure conditions, and thick-film polyurethane OCA suited to foldable display hinges. These are not unclaimed entirely, but the filing density is noticeably lower than the core optical-clarity and curing-chemistry claims, making them worth a dedicated freedom-to-operate check before committing to a filing strategy there.
Not necessarily. The most-cited records in this dataset, including WO2016008130A1 and US20150210042A1, date to the 2014–2017 window, and citation counts inside any searched patent corpus tend to favour older filings simply because they have had more time to accumulate citations from later filers. A high citation count is a reasonable signal of a record's influence on subsequent claim drafting, but it should be read alongside filing trends and current assignee activity rather than treated as a stand-alone measure of present-day commercial relevance.
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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.