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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/silicone-elastomer-additives-and-fillers-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Polymers & Composites · Patent LandscapeSilicone Elastomer Additives and Fillers: Patents, Leading Filers and Where Claim Space Remains Open
- Filings have been declining since the 2020 peak. 785 families filed in 2020 fell to roughly half that by 2022, with the trend continuing downward — a maturing claim landscape, not a growing one.
- Tyre chemistry pulls heavily on this dataset. B60C (pneumatic tyres) accounts for 2,351 records alongside the core polymer-composition classes, tying elastomer additive claims tightly to tyre compounding IP.
- The most-cited foundational patents are decades old. Platinum-catalysed siloxane chemistry and biocompatible-membrane silicone compositions still anchor citation counts above 1,000 — current filers are building on, not replacing, that base.
27.2K
Published Records
34%
Top-5 Share of All Records
-56%
Filing Growth 2021→2024
US
Leading Jurisdiction
Filing growth compares 2021 (689 records) with 2024 (300) — 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 27,224 records in scope (CR5), not by the ranked leaders only.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Field Overview
What this patent set covers
Silicone elastomer additive and filler patents span the chemistry that turns raw polysiloxane into a usable rubber: reinforcing fillers such as silica, curing additives including platinum hydrosilylation catalysts, and the surface-treatment chemistry that governs adhesion and dispersion. The search set pulls together 27,224 patent families published between 2015 and mid-2026, spanning polymer-composition claims (C08L), additive-use claims (C08K), condensation-polymer routes (C08G) and processing claims (C08J), with a substantial secondary cluster in pneumatic tyre compounding (B60C).
Because publication typically lags filing by around 18 months, the most recent one or two years in any trend chart will always look thinner than they will eventually turn out to be. Read the tail of the trend as incomplete, not as a real drop-off.
Filing activity, 2017–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Numbers
Filing trends and technology composition
27,224 published families sit across eight IPC subclasses, with filing activity now well past its 2020 peak. The composition below shows where claim density concentrates and where the tyre-industry overlap sits relative to core polymer chemistry.
A peak-and-decline filing curve
Annual filings rose to 785 in 2020, then fell roughly in half by the 2022 midpoint (398) and continued down toward single digits by 2026 (partial year, 11 filings recorded so far). This is consistent with a technology whose core claim space is largely staked out, with new filings increasingly incremental rather than foundational.
Polymer chemistry dominates, tyres are a strong second theme
C08L (polymer compositions) and C08K (polymer additives) together account for over 18,500 records — the bulk of the corpus. C08G condensation-polymer routes and C08J processing claims trail well behind, and B60C pneumatic tyre claims (2,351) confirm that a meaningful share of this filing activity is tyre-compound specific rather than generic elastomer chemistry.
Shares are the percentage of the 27,224 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
Go deeper on Silicone Elastomer Additives and Fillers with Eureka
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Representative Recent Filing
Improving adhesion between cured silicone elastomer layers (Dow Silicones, 2024)
DOW SILICONES CORPORATION
There is described a primer composition comprising a silicone polyether, a reinforcing filler, one or more polydiorganosiloxane polymer(s) and a carrier and the preparation and use thereof. The primer composition is particularly designed for use with silicone elastomers especially for addition (hydrosilylation) curing silicone elastomers, the preparation thereof, and to a process for improving the adhesion of silicone elastomeric compositions to pre-cured silicone elastomer material substrates. A method for improving the adhesion of silicone elastomer to a pre-cured silicone elastomeric substrate is provided.Filed by Dow Silicones, published August 2024 — a working example of how current filings target a narrow process problem (interlayer adhesion) rather than base polymer chemistry.
Most-cited records in the corpus
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US3775452A | Platinum complexes of unsaturated siloxanes and platinum containing organopolysiloxanes | 1,932 |
| 2 | US4153641A | Polysiloxane composition and contact lens | 1,913 |
| 3 | US5702387A | Coated electrosurgical electrode | 1,740 |
| 4 | US20050090607A1 | Silicone composition for biocompatible membrane | 1,522 |
| 5 | US20080045824A1 | Silicone composition for biocompatible membrane | 1,108 |
| 6 | US5435816A | Method of making an abrasive article | 1,042 |
| 7 | US3445420A | Acetylenic inhibited platinum catalyzed organopolysiloxane composition | 983 |
| 8 | US6013718A | Rubber composition based on silica and on functionalized diene polymer which has a silanol end functional gro… | 968 |
| 9 | US3989668A | Method of making a silicone elastomer and the elastomer prepared thereby | 845 |
| 10 | US6503973B2 | Vulcanizable rubber composition usable for the manufacture of a tire, and a tire comprising this composition | 834 |
Citation counts inside a searched corpus skew toward older filings by construction — they measure historical influence on later filers, not current commercial relevance. All five top-cited records here predate 2015 filings by wide margins and are grandparents to the current claim landscape rather than active competitive threats.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for filing decisions
Three patterns matter more than the headline count: where the filing curve is heading, which jurisdictions carry the claim density, and how citation age should be weighted.
Filing Momentum
785 → ~11
peak (2020) vs. latest partial year
The curve has turned down, not just flattened
From a 2020 peak of 785 families, filings dropped to 398 by the 2022 midpoint and have kept falling. Even allowing for publication lag understating the most recent years, the multi-year downward slope predates any lag effect and points to a genuinely maturing filing environment.
Trend basis: annual family counts 2017–2026
Jurisdiction Spread
US 7,921
largest single receiving office
US and EPO carry the bulk of filings
The United States (7,921) and European Patent Office (5,756) together account for the majority of receiving-office activity, with WIPO/PCT filings (2,184) a distant third. Filers targeting only one major jurisdiction are missing where most of the competitive claim density actually sits.
Receiving offices: US, EPO, WIPO, Canada, Australia, UK
Citation Age Bias
1,932 cites
top-cited record's citation count
The most-cited patents are legacy chemistry
The five most-cited records include platinum-catalysed siloxane and biocompatible-membrane silicone compositions with citation counts above 1,100. High citation counts here reflect decades of accumulated influence, not that this chemistry is still where competitive activity is concentrated.
Based on the five most-cited records in the corpus
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to silicone elastomer additives and fillers, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Who Is Filing
Assignee activity and momentum
Filing activity concentrates around a small group of tyre and silicone-specialty manufacturers, several of which show sharply declining recent-year momentum rather than continued build-out.
Momentum Signal
-100% YoY
Dow Silicones, latest year
Several leading filers show zero or near-zero recent filings
Dow Silicones and Shin-Etsu Chemical both show -100% year-on-year momentum with zero filings in the latest recorded year, while Bridgestone Corporation still filed 4 (down 43% YoY). This pattern is consistent across the top of the ranking, not isolated to one firm.
Momentum measured on latest full/partial year vs. prior year
Co-Filing Pattern
569 shared
strongest co-assignee pair
Corporate-group co-filing dominates joint records
The strongest co-assignee pair, Michelin Group and Michelin Research and Technology, appears in 569 shared records — far ahead of the Dow Silicones / Dow Global Technologies pairing (171). Co-filing here mostly reflects internal corporate-structure splits rather than external collaboration.
Based on the 10 identified co-assignee pairs in the corpus
Tyre-Sector Overlap
2,351 records
B60C pneumatic tyre claims
Tyre manufacturers are a distinct filing bloc
Bridgestone and its US tyre-operations affiliate file specifically into the B60C pneumatic-tyre overlap, a separate competitive lane from silicone-specialty chemical firms like Dow Silicones or Shin-Etsu, which file mainly into core C08L/C08K polymer-composition claims.
Cross-referenced against IPC subclass B60C
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Bridgestone Corporation | 4 | -43% |
| Bridgestone Americas Tire Operations, LLC | 1 | -90% |
| Dow Silicones Corporation | 0 | -100% |
| General Electric Company | 0 | — |
| Compagnie Générale des Établissements Michelin (Michelin Group) | 0 | — |
| Shin-Etsu Chemical Co., Ltd. | 0 | -100% |
| Michelin Recherche et Technique S.A. (Michelin Research and Technology) | 0 | — |
| Dow Corning Toray Silicone Co., Ltd. | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Next Steps
Where to take this analysis
The filing curve and citation base point to a technology where the core chemistry is well staked out but specific process and adhesion problems remain open for new claims.
Map freedom-to-operate around the top-cited base patents
Before filing into platinum-catalysed cure chemistry or biocompatible membrane compositions, check claim scope against the highest-cited records directly rather than assuming age alone clears the field.
Explore FTO analysis in EurekaTrack the momentum shift away from historic leaders
With several top assignees showing zero or sharply reduced recent filings, model whether that reflects portfolio consolidation, licensing shifts, or a genuine pullback from the space.
Monitor assignee activity in EurekaTest claims against the under-claimed process branches
Adhesion primers, filler surface treatment and low-temperature cure kinetics show thinner coverage than core composition claims — worth a targeted novelty search before drafting.
Run a white space search in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Frequently Asked
Common questions on this landscape
Filing activity concentrates around tyre manufacturers and silicone-specialty chemical firms, with Bridgestone, Dow Silicones (and its Dow Global Technologies affiliate), Shin-Etsu Chemical, Michelin and General Electric all appearing prominently in the assignee ranking. Several of these firms show declining recent-year filing momentum rather than continued growth, which suggests the leadership positions were established earlier in the dataset's timeframe. Co-assignee patterns also show that corporate-group entities, such as Michelin Group and Michelin Research and Technology, frequently file jointly, which is worth accounting for when comparing raw assignee counts.
Annual filings peaked at 785 in 2020 and have fallen steadily since, reaching roughly 398 by the 2022 midpoint and continuing downward. This pattern typically indicates that core claim space in a chemistry area has been substantially staked out, so new filings shift toward incremental process improvements rather than foundational composition claims. Note that the very latest years in the trend are always undercounted because publication lags filing by around 18 months, so the true decline is somewhat less steep than the raw numbers suggest, but the multi-year downward trajectory predates that lag effect.
The United States (7,921 records) and the European Patent Office (5,756) carry the largest share of receiving-office activity, with WIPO/PCT filings (2,184), Canada (1,284), Australia (1,044) and the UK (916) following. A filing strategy that covers only a home jurisdiction misses the bulk of where competitive claim density actually sits. Companies evaluating freedom-to-operate should treat US and EPO coverage as the baseline check, not an optional extra.
US20240262970A1, assigned to Dow Silicones and published in August 2024, covers a primer composition built from a silicone polyether, a reinforcing filler and polydiorganosiloxane polymers, along with the method of using that primer to improve adhesion between a fresh silicone elastomer layer and a pre-cured silicone elastomeric substrate. It is a narrow, process-specific claim aimed at interlayer adhesion rather than a base polymer or filler composition claim. Anyone working on multi-layer silicone elastomer parts with hydrosilylation (addition) curing should review this filing's claim scope specifically around primer chemistry and application method.
Core polymer-composition claims (C08L) and additive-use claims (C08K) account for the large majority of the 27,224 records in this dataset, meaning that space is heavily occupied. Comparatively thinner areas include recycled or bio-based reinforcing filler alternatives to standard fumed silica, low-temperature hydrosilylation cure kinetics, and adhesion-primer chemistry for bonding fresh elastomer to pre-cured substrates — the last of which the 2024 Dow Silicones filing demonstrates is still active but narrow. These branches warrant a dedicated novelty search rather than an assumption of open space, since filing density alone does not confirm technical feasibility.
Answers are grounded in the same dataset. Derived from a Patsnap search on Silicone Elastomer Additives and Fillers covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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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.