Structural Adhesives Patents: Leaders, Trends & White Space 2026
- Filing has plateaued, not grown. activity peaked at 28 families in 2018 and sat at 27 by the 2022 midpoint, with no clear upward trend since — this is a mature, contested field rather than an emerging one.
- Epoxy chemistry dominates the IPC mix. C09J (adhesives) appears in 416 of 465 families and C08G (condensation polymers, the epoxy/polyurethane backbone) in 274 — most of the contest is happening inside epoxy and polyurethane formulation, not novel chemistries.
- Momentum has gone quiet at the top. among the most active historical filers, only one shows any filings in the latest year, and the rest show zero — a sign that leadership positions were staked out early and are now being defended rather than expanded.
A mature adhesive chemistry space built on epoxy and polyurethane backbones
Structural adhesives for assembly sit at the intersection of formulation chemistry and joint engineering: the claims in this dataset cluster around lap shear strength, impact peel, surface pretreatment and cure schedule as the properties that separate a workable bonding system from one that fails in service. The IPC composition confirms this is fundamentally a polymer chemistry field — C09J (adhesives) and C08G (condensation polymers, the epoxy and polyurethane backbone) cover the large majority of records, with C08L polymer-blend claims and C08K filler/additive claims layered on top.
Filing activity across the tracked window shows a field that expanded quickly through the late 2010s and has since flattened. Publication naturally lags filing by around eighteen months, so the final year or two in any trend understates real activity, but the pattern from peak to midpoint already points to a plateau rather than continued growth.
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Filing trend and technology composition
Two views of the same 465-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the claims.
Filing trend, 2017-2026
Filings rose to a peak of 28 in 2018, held near that level through the low-to-mid 2020s (27 at the 2022 midpoint), and taper toward the data cut-off — the tail years are undercounted because of publication lag, not necessarily a real drop-off.
IPC subclass distribution
C09J (adhesives generally) and C08G (condensation polymers, covering epoxy and polyurethane resin chemistry) dominate the corpus, with B32B (layered products) and B82Y (nanotechnology) appearing only in a minority of records — evidence that most competitive activity is in formulation rather than in laminate architecture or nanofiller systems.
Shares are the percentage of the 465 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Structural Adhesives for Assembly with Eureka
This page is one run against one query. Ask Eureka your own question about structural adhesives for assembly and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited prior art in structural adhesive bonding
Low Density Epoxy Syntactic Structural Adhesive for Automotive Applications
The present disclosure provides a syntactic structural adhesive comprising an epoxy resin, a low density particulate filler and a hardener that, upon curing, exhibits at least the following well-balanced properties: (i) a density less than 1 g/cm3; (ii) a compression modulus greater than 500 MPa; and (iii) a lap shear strength greater than 750 psi. The syntactic structural adhesive may be used in a variety of applications, such as in automotive applications for bonding and/or sealing metal, plastic and composite parts.Filed by Huntsman Advanced Materials Americas LLC, published 2021-09-23.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4223115A | Structural adhesive formulations | 224 |
| 2 | US7625977B2 | Adhesive of epoxy resin, toughener and blocked isocyanate polytetrahydrofuran toughener | 143 |
| 3 | US20120129980A1 | Structural adhesive compositions | 130 |
| 4 | US20130115442A1 | Structural adhesive and bonding application thereof | 73 |
| 5 | US20140113983A1 | Structural adhesives | 72 |
| 6 | US4293665A | Structural adhesive formulations | 69 |
| 7 | US20140150970A1 | Structural adhesive compositions | 66 |
| 8 | WO2009124709A1 | Improvements in or relating to structural adhesives | 65 |
| 9 | US5385990A | Structural adhesive composition having high temperature resistance | 64 |
| 10 | US20110126980A1 | Two-part epoxy-based structural adhesives | 59 |
Citation counts favour older records simply because they have had longer to accumulate citations inside this searched corpus — treat the ranking as a map of influence, not of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Read together, the trend line, IPC mix and citation table point to a field where the easy formulation claims are already staked out and the remaining room is in specific property combinations and application-specific tuning.
Growth has stalled, not accelerated
The peak year of 28 families in 2018 was essentially matched again at the 2022 midpoint, with no sustained climb in between. New entrants are filing into a space where the core formulation claims — epoxy toughening, isocyanate blocking, filler loading — are already well covered.
Adhesive-class claims dominate the corpus
Nearly every record in this dataset falls under C09J, with C08G condensation-polymer chemistry as the second-largest subclass. Claims outside epoxy/polyurethane backbones — nanotech fillers (B82Y) at 20 records, polymer processing (C08J) at 18 — are a small minority.
A small set of foundational filings anchors the field
The most-cited record in the corpus, a formulation patent, carries citation counts far above the rest of the top table, with a second tier built on epoxy-toughener and blocked-isocyanate chemistry. New filings routinely have to design around this small set of foundational claims.
Leadership positions look settled, not contested
Among the historically most active assignees tracked for recent-year momentum, only one shows any filings in the latest year; the remainder show none. That pattern is consistent with a field where dominant players filed heavily earlier and are now maintaining rather than expanding portfolios.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to structural adhesives for assembly, with the prior art for and against each one.
Who holds the claims, and where activity has gone quiet
Filing is concentrated among a small group of industrial adhesive and chemicals companies, several of which co-file with individual named inventors or regional subsidiaries — a pattern typical of long-running formulation programmes rather than new market entry.
Corporate-subsidiary co-filing is the norm at the top
The strongest co-assignee pairs link a parent company to its regional subsidiary or to a named inventor, rather than linking two independent competitors — a sign of internal patent administration structure rather than cross-company collaboration.
Only one tracked leader is still filing at pace
Of the assignees with the strongest historical momentum profiles, just one shows growth in the latest tracked year; the others in that group show no filings at all in the same period, suggesting a wave of portfolio consolidation rather than continued expansion.
Europe and the US are the primary battlegrounds
Europe and the United States each host more than 100 records, with WIPO PCT filings a further significant share — India and China trail but are not negligible, pointing to a global rather than single-market filing strategy among the leading assignees.
| Assignee | Recent year | YoY |
|---|---|---|
| Henkel AG & Co. KGaA | 2 | +100% |
| PPG Industries Ohio, Inc. | 0 | — |
| 3M Innovative Properties Company | 0 | — |
| Zephyros, Inc. | 0 | — |
| Dow Global Technologies LLC | 0 | — |
| Sika Technology AG | 0 | — |
| Lord Corporation | 0 | — |
| Cytec Technology Corp. | 0 | — |
Where to take this analysis
The dataset points to a plateaued but still commercially active field. The next steps depend on whether the goal is freedom-to-operate, competitive tracking, or identifying an open filing position.
Map claims against your own formulation
Run a claim-by-claim comparison of the most-cited records against any formulation under development, particularly around lap shear strength thresholds and cure schedule parameters.
Explore claim charts in EurekaTrack the quiet leaders
Several historically dominant assignees show zero filings in the latest year — worth monitoring for renewed activity or acquisition-driven portfolio shifts.
Set up assignee alerts in EurekaTest white space claims
Sub-areas such as nanofiller-toughened bondlines and pretreatment-free bonding show thinner coverage than the core epoxy claim space and merit a closer novelty check.
Run a novelty search in EurekaCommon questions about structural adhesive patents
Filing in this space is concentrated among a small group of established adhesive and specialty chemicals manufacturers, several of which co-file jointly with regional subsidiaries or named inventors. The strongest co-assignee pairings link a parent company to its subsidiary rather than two independent competitors, which points to long-running internal formulation programmes rather than new entrants. Recent-year momentum data shows most of these historically active filers have gone quiet, with only one showing continued growth in the latest tracked year.
Not clearly. Filing activity peaked at 28 families in 2018 and was still at 27 by the 2022 midpoint, which is a plateau rather than sustained growth. Publication lag means the most recent one to two years in the trend will always look lower than they eventually turn out to be, so the true recent picture is likely flat rather than declining. Overall the pattern is consistent with a mature field where core claims are staked out and filing continues mainly to defend or extend existing positions.
The claims in this corpus centre on lap shear strength, impact peel resistance, surface pretreatment requirements, cure schedule, and aging resistance — the properties that determine whether a bonded joint survives real-world loading and environmental exposure. Most of this activity sits inside epoxy and polyurethane resin chemistry, reflected in the dominance of the C09J and C08G IPC subclasses. Filler and additive claims under C08K, covering things like toughening agents and low-density particulates, are a secondary but active layer on top of the base resin chemistry.
Relative to the dense core of epoxy and polyurethane formulation claims, sub-areas such as nanofiller-toughened bondlines, low-density syntactic fillers, pretreatment-free bonding processes, rapid cure-schedule systems and aging-resistant joint design show comparatively thin coverage. B82Y (nanotechnology) records make up only a small fraction of the corpus, for example, despite growing interest in nanofiller toughening elsewhere in adhesives research. These are the branches worth a closer novelty search before committing to a formulation direction.
US20210292615A1, filed by Huntsman Advanced Materials Americas, claims a syntactic epoxy structural adhesive defined by a specific combination of density below 1 g/cm3, compression modulus above 500 MPa, and lap shear strength above 750 psi. Anyone developing a low-density epoxy adhesive for automotive bonding needs to check whether their formulation falls inside that specific three-property envelope, since it is the combination — not any single property — that defines the claimed space. Formulations that fall outside one of the three thresholds, or that use a different filler strategy to achieve low density, would sit outside this particular claim.
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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.