Silicone Elastomer Synthesis Patents: Leaders & Filing Trends 2026
- Filing has cooled since its 2021 peak. 54 families filed that year against 23 in 2017 and just 7 in the most recent (partial) year — growth is flat-to-declining, not accelerating.
- Condensation chemistry dominates the claim map. C08G accounts for 250 of 857 records, nearly triple the smallest tracked subclass, meaning polysiloxane condensation routes are the most heavily fenced ground.
- One 1980s patent still anchors the citation graph. US4260725A, on thermally bonded hydrophilic polysiloxanes for contact lenses, carries 1,111 citations — more than 4x the next most-cited record.
Filing growth compares 2021 (54 records) with 2024 (28) — 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 857 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Silicone elastomer polymer synthesis spans the chemistry used to build, cure and stabilise polysiloxane networks — from condensation and addition polymerisation routes through to crosslinking chemistry and additive packages that tune the final rubber or coating. This dataset pulls 857 patent families published between 2015 and mid-2026 whose title, abstract or claims combine silicone elastomer or polysiloxane terminology with synthesis, crosslinking or polymerization language. Families, not raw document counts, are the unit used throughout — this neutralises the effect of continuation filings and multi-jurisdiction duplicates on the ranking.
Coverage runs to a 2026-07-31 cut-off. Because publication typically lags filing by around 18 months, the last one to two years in any trend chart will always undercount true filing activity — read the tail as a floor, not a ceiling.
Filing trend and technology composition
Two views of the same 857-family dataset: how filing volume has moved year over year, and how those families distribute across IPC subclasses.
A peak in 2021, then a pullback
Filings rose from 23 in 2017 to a peak of 54 in 2021, then eased to 16 by the 2022 midpoint and down to 7 in the most recent partial year. That trajectory reads as a maturing, consolidating field rather than an emerging one — new entrants are filing into already-dense prior art rather than opening new ground.
Condensation chemistry leads by a wide margin
C08G (condensation polymers) tops the IPC breakdown at 250 records, ahead of C08L polymer compositions (185) and C09D coatings (156). C08K additives (113), C07F organo-metallic compounds (99), C08F addition polymers (93), C08J processing (92) and G02B optics (86) round out a composition spread across eight subclasses — evidence that synthesis work here routes through several adjacent disciplines rather than sitting in one code.
Shares are the percentage of the 857 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Silicone Elastomer Polymer Synthesis with Eureka
This page is one run against one query. Ask Eureka your own question about silicone elastomer polymer synthesis and every answer comes back with the patent numbers behind it.
Try EurekaKey patents and citation anchors
US6805556B2 — Silicone rubber resin composite for denture bonding
Filed by BITEC Global Japan, this patent covers a silicone rubber with improved adhesive properties formed by adding methyl methacrylate to a linear polysiloxane and polymerising it in a molding cavity, producing methyl polymethacrylate on the silicone rubber surface. The resulting composite bonds a base member — resin, metal or a denture bed section — firmly and directly to the rubber, with a specific application to denture manufacture.Dated 2004-10-19 — now outside its core term in most jurisdictions, but its bonding-layer approach remains a reference point for later biocompatible-adhesion claims.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4260725A | Hydrophilic contact lens made from polysiloxanes which are thermally bonded to polymerizable groups and which… | 1,111 |
| 2 | US5145886A | Radiation activated hydrosilation reaction | 234 |
| 3 | US9097840B2 | Amphiphilic siloxane-containing (meth)acrylamides and uses thereof | 227 |
| 4 | US9103965B2 | Amphiphilic siloxane-containing vinylic monomers and uses thereof | 211 |
| 5 | US9475827B2 | Tris(trimethyl siloxyl)silane vinylic monomers and uses thereof | 205 |
| 6 | WO2014097309A1 | Stimuli responsive self cleaning coating | 173 |
| 7 | US4808638A | Thiolene compositions on based bicyclic 'ene compounds | 159 |
| 8 | US6348237B2 | Jet plasma process for deposition of coatings | 136 |
| 9 | US6203898B1 | Article comprising a substrate having a silicone coating | 129 |
| 10 | US4838876A | Silicone rubber catheter having improved surface morphology | 113 |
Citation counts are pulled from the searched corpus only and skew toward older filings — treat them as a signal of foundational influence, not of current commercial relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the filing trend, IPC composition and citation graph, each with a direct implication for where to focus diligence.
The field has passed its filing peak
Volume climbed steadily from 23 filings in 2017 to 54 in 2021, then fell back through a 2022 midpoint of 16 to 7 in the latest partial year. Even discounting for publication lag, the shape is a plateau-then-decline, not renewed acceleration.
Condensation routes are the most fenced
C08G alone accounts for nearly a third of all 857 families, ahead of C08L compositions and C09D coatings. New filers targeting classic condensation-cure polysiloxane chemistry are competing against the largest single block of prior art in this dataset.
One legacy patent still shapes the field
US4260725A, on thermally bonded hydrophilic polysiloxane contact lens material, holds more than four times the citations of the next-ranked record, US5145886A on radiation-activated hydrosilation. Its influence sits mainly in optical and biomedical silicone chemistry.
Co-filing is limited and concentrated
Only ten co-assignee pairs appear across the dataset, and the strongest pairing occurs at 15 shared filings — a modest number that points to mostly independent, single-owner research programmes rather than joint-development norms in this space.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to silicone elastomer polymer synthesis, with the prior art for and against each one.
Who is filing, and where momentum has stalled
Recent-year momentum diverges sharply from historical filing weight: several long-standing assignees show zero filings in the latest year, while one newer name is still active.
One assignee still filing while others go quiet
Genentech posted 6 filings in the most recent year, the only meaningful latest-year activity among the tracked assignees. Every other major name in the momentum table — Novartis, Jotun, 3M, Shin-Etsu Chemical, Konica — shows zero.
Established chemistry names have gone quiet
Shin-Etsu Chemical and Novartis both appear among the strongest co-assignee pairings historically, yet both register zero filings in the latest tracked year. That combination — historical weight, no current activity — is consistent with the broader post-2021 filing decline.
The strongest collaboration link in the dataset
Konica (Konica Corporation) and Mitsubishi Chemical (Mitsubishi Chemical Corporation) share the largest co-assignee count at 15, ahead of the Novartis–Shin-Etsu pairing at 10. These recurring pairs are the clearest signal of a working supply or joint-development relationship in this corpus.
| Assignee | Recent year | YoY |
|---|---|---|
| Genentech | 6 | — |
| Novartis AG | 0 | — |
| Jotun Group | 0 | — |
| 3M Innovative Properties Company | 0 | -100% |
| Shin-Etsu Chemical Co., Ltd. | 0 | — |
| Konica Corporation | 0 | — |
| Rhone-Poulenc Chimie | 0 | — |
| Mitsubishi Chemical Corporation | 0 | — |
Where to take this analysis
The landscape points to a mature, condensation-chemistry-heavy field with a narrow band of continuing activity. The following moves turn that read into action.
Map claims against the C08G block directly
Before filing into condensation-cure polysiloxane chemistry, run a claim-by-claim comparison against the 250-record C08G set rather than the dataset as a whole — this is where collision risk concentrates.
Explore the IPC breakdown in EurekaTrack the Genentech filings for direction
With every other tracked assignee flat or declining, Genentech's continuing filings are the clearest live signal of where new silicone elastomer synthesis work is still being claimed.
Follow assignee momentum in EurekaVerify co-assignee ties before assuming independence
The Konica–Mitsubishi Chemical and Novartis–Shin-Etsu pairings suggest active supply or joint-development relationships; confirm these before treating either party's portfolio as standalone.
Check co-assignee networks in EurekaCommon questions on silicone elastomer synthesis patents
No, not by filing volume. The dataset shows filings rising from 23 in 2017 to a peak of 54 in 2021, then falling to 16 by 2022 and 7 in the most recent partial year. Because publication lags filing by roughly 18 months, the very last year understates true activity, but the multi-year decline from the 2021 peak is a real trend, not an artefact of the cut-off. Anyone entering this space should expect to compete against a dense, already-filed prior art base rather than an open frontier.
C08G, covering condensation polymers, leads with 250 of the 857 tracked families, well ahead of C08L polymer compositions at 185 and C09D coatings at 156. This means classic condensation-cure polysiloxane chemistry is the most heavily claimed route in the dataset. Filers should expect the tightest prior art collisions here and may find more open room in less-crowded subclasses such as C07F organo-metallic chemistry or C08F addition polymerisation.
US4260725A describes a hydrophilic contact lens made from polysiloxanes thermally bonded to polymerisable groups carrying hydrophilic sidechains. It is the single most-cited record in this corpus at 1,111 citations, more than four times the next-ranked patent. Its influence is concentrated in optical and biomedical silicone chemistry, and later amphiphilic siloxane monomer patents in the same citation chain build directly on its bonding approach — worth reviewing for anyone working on lens-grade or biocompatible siloxane materials.
Recent-year momentum data shows Genentech as the only assignee with meaningful latest-year activity, at 6 filings, while long-standing names including Novartis, Jotun, 3M, Shin-Etsu Chemical and Konica all show zero filings in the same period. 3M's year-over-year change is recorded at -100%, the sharpest pullback in the tracked group. This divergence suggests the historical leaders in silicone chemistry have either shifted focus or simply have filings still working through the publication pipeline.
Relative to the dense C08G condensation and C09D coatings blocks, subclasses like C07F organo-metallic crosslink chemistry, C08F addition-cure elastomer blends and G02B optical-grade siloxane interfaces carry noticeably fewer records. Radiation-cured hydrosilation systems and amphiphilic siloxane vinylic monomer chemistry — both visible in the top-cited patent list — also show room relative to the core condensation art. A freedom-to-operate search focused on these narrower branches is likely to turn up thinner prior art than a search centred on core condensation or coating claims.
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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.