Epoxy Resin Interface Engineering Patents: Leaders & Trends 2026
- Filing peaked in 2017 at 508 records and has declined through the most recent full year, a pattern more consistent with a settled claim map than a growing one.
- Momentum has stalled at the top several of the most historically active assignees show 0 filings in the latest year, including one down -100% YoY.
- Claim density sits outside the core polymer class too H01L semiconductor devices and H05K printed circuits each carry thousands of records, showing the interface chemistry is claimed as much through end-use as through the resin itself.
Filing growth compares 2021 (306 records) with 2024 (276) — 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 12,894 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Epoxy resin interface engineering spans the chemistry that governs how an epoxy matrix bonds to a fiber, filler, substrate or encapsulated component — coupling agents, interphase formation and interfacial adhesion rather than the bulk resin cure itself. The dataset behind this page pulls records tagged with fiber-matrix interface, interfacial adhesion, coupling agent or interphase language, filtered against the polymer composition and lay-up processing IPC classes (C08J5/06, C08L63, B29C70). That combination separates interface-specific claims from the much larger body of general epoxy formulation art.
Coverage runs from 2015 through the 2026 data cut-off, with 12,894 published records assigned into families. Because publication typically lags filing by around eighteen months, the most recent one to two years in any trend line will read lower than the true filing rate once those applications finish publishing.
Filing trend and technology composition
Two views of the same corpus: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in once you look past the primary epoxy composition class.
A peak in 2017, then a decline
Filings ran at 508 in 2017, the peak of the series, fell to 293 by the 2022 midpoint, and stood at 93 in the most recent (partial) year. That trajectory — down through the midpoint rather than up — points to a technology where the core claim space was staked out early rather than one still expanding.
Interface claims live across eight IPC subclasses
C08L (polymer compositions) covers nearly the whole corpus at 12,366 records, but C08G condensation polymers and C08K polymer additives each carry over 7,000, and H01L semiconductor devices holds 3,683 — meaning a large share of interface-engineering claims are written into encapsulation and device-packaging applications, not standalone resin patents.
Shares are the percentage of the 12,894 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Epoxy Resin Interface Engineering with Eureka
This page is one run against one query. Ask Eureka your own question about epoxy resin interface engineering and every answer comes back with the patent numbers behind it.
Try EurekaMost-cited records and a representative claim
US7544727B2 — Encapsulant of epoxy resin, curing agent, and secondary aminosilane coupling agent or phosphate
An encapsulating epoxy resin molding material comprising (A) an epoxy resin, (B) a curing agent, and (C) a silane coupling agent having a secondary amino group or (D) a phosphate, and semiconductor devices encapsulated therein. The material is described as excellent in fluidity, with the encapsulated device — arranged on thin, multi-pin, long-wire, narrow-pad-pitch or organic substrates — reported free of molding defects such as wire sweep and voids.Abstract excerpted from the filing; see the source record for full claim language.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US5856373A | Dental visible light curable epoxy system with enhanced depth of cure | 352 |
| 2 | US5998495A | Ternary photoinitiator system for curing of epoxy/polyol resin compositions | 272 |
| 3 | US6187833B1 | Ternary photoinitiator system for curing of epoxy/polyol resin composition | 248 |
| 4 | US6572971B2 | Structural modified epoxy adhesive compositions | 212 |
| 5 | US5352745A | Curable polyphenylene ether and cyanurate resin composition and a cured resin composition obtainable therefrom | 194 |
| 6 | US5554670A | Method of preparing layered silicate-epoxy nanocomposites | 187 |
| 7 | US4853270A | Knee blocker for automotive application | 185 |
| 8 | US6180696B1 | No-flow underfill of epoxy resin, anhydride, fluxing agent and surfactant | 180 |
| 9 | US5229464A | Epoxidized viscous conjugated diene block copolymers | 180 |
| 10 | US7163973B2 | Composition of bulk filler and epoxy-clay nanocomposite | 177 |
Citation counts favor older records simply by virtue of having had longer to accumulate citations inside this corpus; read them as a signal 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 numbers say about this field
Three read-throughs from the filing trend, the IPC composition and the citation table, aimed at where a team would actually need to make a decision.
A claim map staked out early
The decline from a 2017 peak of 508 through a 293 midpoint in 2022 to 93 in the latest year is a steeper drop than partial-year reporting alone would explain. Combined with flat-to-negative momentum among the assignees who filed most historically, this reads as a field where the foundational coupling-agent and interphase chemistry claims were largely filed a decade ago.
Interface chemistry is claimed through end-use
C08G and C08K each exceed 7,000 records and H01L exceeds 3,600, meaning a substantial share of interface claims are embedded in encapsulation, condensation-polymer and semiconductor-packaging filings rather than filed as standalone coupling-agent compositions. Anyone scoping freedom-to-operate needs to search device and packaging classes, not just C08L.
Japan and China dominate the filing offices
Japan leads at 3,413 records and China follows at 2,828, well ahead of the United States (2,278) and EPO (2,007). That ordering matches a field with deep roots in Japanese electronics-materials suppliers, and it shapes where prior art searches and opposition risk concentrate.
Filing partnerships are narrow but deep
Only ten co-assignee pairs appear in the corpus, but the strongest — a pairing tied to Toshiba's chemicals arm — spans 177 shared families. Collaboration here looks like a small number of long-running corporate-affiliate filing relationships rather than a broad ecosystem of joint ventures.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to epoxy resin interface engineering, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| TOSHIBA KEMIKARU KK | Toshiba Chemical Corporation | 177 |
| Resonac Corporation | Hitachi, Ltd. | 45 |
| Sumitomo Bakelite Co., Ltd. | NEC Corporation | 19 |
| Resonac Corporation | Namics Corporation | 16 |
| Toshiba Corporation | Toshiba Chemical Corporation | 10 |
| Sumitomo Bakelite Co., Ltd. | Sumitomo Dielec Corporation | 9 |
| Shin-Etsu Chemical Co., Ltd. | Ryuson Co., Ltd. | 6 |
| Nitto Denko Corporation | Dai-ichi Kogyo Seiyaku Co., Ltd. | 5 |
Co-filing in this space is concentrated in a handful of corporate-affiliate pairs rather than distributed across many independent partnerships.
Who is filing, and who has stopped
The assignee list is long-tailed, and the momentum data matters as much as the historical totals: several names with large legacy portfolios show no filings at all in the latest year.
Two established filers went to zero
Sumitomo Bakelite Co., Ltd. (Sumitomo Bakelite) and Resonac Corporation (Resonac) both recorded filings in the prior year and none in the latest year, a -100% year-over-year drop for each. That is consistent with the broader decline in the trend line rather than an isolated retreat by either firm.
Shin-Etsu is filing, but barely
Shin-Etsu Chemical Co., Ltd. (Shin-Etsu Chemical) logged a single filing in the latest year against a flat year-over-year rate, making it one of the few tracked assignees still active at all in the most recent period.
Multiple legacy names show no recent filings
Toray Industries, Inc. (Toray), Nitto Denko Corporation (Nitto Denko) and Mitsubishi Gas Chemical Company, Inc. (Mitsubishi Gas Chemical) all show zero filings in the latest year. Whether that reflects a genuine pull-back or publication lag on very recent applications cannot be determined from this data alone.
| Assignee | Recent year | YoY |
|---|---|---|
| Shin-Etsu Chemical Co., Ltd. | 1 | 0% |
| Sumitomo Bakelite Co., Ltd. | 0 | -100% |
| Resonac Corporation | 0 | -100% |
| Toray Industries, Inc. | 0 | — |
| Nitto Denko Corporation | 0 | — |
| Mitsubishi Gas Chemical Company, Inc. | 0 | — |
| Matsushita Electric Works, Ltd. | 0 | — |
| TOSHIBA KEMIKARU KK | 0 | — |
Where to take this analysis
The trend and player data point to a mature, contracting filing pattern with legacy incumbents pulling back. The open questions are about where the remaining activity is concentrated and what still has room.
Map the semiconductor-packaging overlap
With H01L and H05K together carrying over 5,000 records, interface claims filed as part of encapsulation and packaging patents deserve their own search rather than being read as a subset of the C08L composition art.
Explore in Eureka →Watch the co-assignee pairs for consolidation signals
The concentration of collaboration into a small number of corporate-affiliate pairs, led by a 177-family Toshiba-linked pairing, is worth tracking for restructuring or licensing activity.
Explore in Eureka →Test the under-claimed branches for freedom to operate
Sub-areas like bio-based interphase modifiers and low-temperature-cure primers show thinner claim density in this dataset and warrant a dedicated novelty search before committing R&D spend.
Explore in Eureka →Common questions about epoxy resin interface engineering patents
The filing trend in this dataset shows a peak of 508 records in 2017, dropping to 293 by the 2022 midpoint and 93 in the most recent tracked year. A decline through the midpoint, rather than a rise, usually signals that the core chemistry — coupling agents, interphase formation, adhesion promoters — was claimed early and the field has since settled into incremental filing. Part of the most recent year's low count is also publication lag, since patent applications typically take about eighteen months to publish, so the true 2025-2026 filing rate is understated in any raw count.
Momentum data in this corpus is thin at the top: Shin-Etsu Chemical Co., Ltd. (Shin-Etsu Chemical) shows one filing in the latest year at a flat year-over-year rate, while several other historically active assignees — including Sumitomo Bakelite Co., Ltd. (Sumitomo Bakelite) and Resonac Corporation (Resonac) — show zero filings and a -100% year-over-year change. Others such as Toray Industries, Inc. (Toray), Nitto Denko Corporation (Nitto Denko) and Mitsubishi Gas Chemical Company, Inc. (Mitsubishi Gas Chemical) also register zero in the latest year. This pattern is consistent with a mature filing landscape where large legacy portfolio-holders have slowed rather than a field being actively built out by new entrants.
US7544727B2, assigned to Hitachi Chemical, claims an encapsulating epoxy resin molding material combining an epoxy resin, a curing agent, and either a secondary-amino silane coupling agent or a phosphate. It is directed at semiconductor packaging use cases — thin, multi-pin, narrow-pad-pitch or organic-substrate-mounted devices — where the stated benefit is defect-free molding without wire sweep or voids. Whether it blocks a specific formulation depends on the exact coupling-agent chemistry and claim scope of the granted patent, which should be checked directly rather than inferred from the abstract alone.
The IPC composition shows heavy claim density in core polymer classes (C08L, C08G, C08K) and in semiconductor and printed-circuit end uses (H01L, H05K), but comparatively thinner activity in areas like bio-based interphase modifiers, low-temperature-cure interfacial primers, and nanofiller-interphase gradient control. These are not guaranteed to be open — they simply carry less claim density in this dataset relative to the core resin and encapsulation art. A freedom-to-operate search focused specifically on those sub-areas is the next step before relying on this as a filing gap.
Japan leads as a receiving office with 3,413 records, followed by China at 2,828, the United States at 2,278, the European Patent Office at 2,007, South Korea at 540, and the WIPO PCT route at 341. This distribution reflects the strong historical presence of Japanese electronics-materials and chemical companies in this space, and it means prior art and freedom-to-operate searches in this field should prioritize Japanese and Chinese-language literature alongside the more commonly searched US and EPO filings.
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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.