Non-Phthalate Plasticizer Patents: Leaders, Trends & White Space 2026
- Filing peaked in 2020 at 15 families and has since flattened, with 2022 sitting at the midpoint of 8 — this is a maturing claim space, not a growing one.
- China accounts for 68 of the tracked filings, versus 6 from South Korea and single digits from Europe and the US, concentrating both the prior art and the enforcement risk in one jurisdiction.
- The most-cited record is a wallcoverings formulation from 2008, not a recent filing — citation counts here reward early entrants, not current technical leadership.
Filing growth compares 2021 (8 records) with 2024 (5) — 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 91 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Non-phthalate plasticizers replace ortho-phthalate esters such as DEHP in PVC and related polymer compounds, largely on toxicity and migration grounds. The two dominant chemistries in this dataset are DOTP (di-octyl terephthalate) and DINCH (di-isononyl cyclohexanoate), with citrate esters appearing as a smaller third route. Search terms combine those chemistries with functional claim language — migration resistance, PVC compatibility, low temperature flexibility, toxicity and esterification — against IPC classes covering acyclic/carbocyclic compounds, polymer additives and polymer compositions.
The corpus totals 91 patent families published between 2015 and mid-2026, spanning six receiving offices. Because publication typically lags filing by around 18 months, the most recent filing year in the trend below is necessarily incomplete and should be read as a floor, not a peak.
Filing trend and technology composition
Two views of the same 91-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the bulk of the claim activity.
A flat-to-declining filing curve since 2020
Filings rose from 7 in 2017 to a peak of 15 in 2020, then eased back toward the 2022 midpoint of 8. There is no acceleration visible in the years since — this reads as a technology area where the core chemistry routes are largely staked out, with incremental formulation work rather than new platform filings.
Acyclic compounds and polymer additives dominate
C07C (acyclic and carbocyclic compounds, 64 records) and C08K (polymer additives, 40 records) together account for the bulk of the classification activity, with C08L (polymer compositions, 32) close behind. Smaller clusters in B01J (catalysis, 14), B01D (separation, 7), C07D (heterocyclics, 7), C08J (polymer processing, 5) and F25D (refrigeration, 3) mark the edges of the field — process and application niches that sit outside the core ester chemistry.
Shares are the percentage of the 91 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Non-Phthalate Plasticizers with Eureka
This page is one run against one query. Ask Eureka your own question about non-phthalate plasticizers and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records
Method for producing di(2-ethylhexyl) terephthalate
Discloses a method for producing DOTP by esterifying terephthalic acid with 2-ethylhexanol in the presence of a chelate catalyst, improving reaction rate, filtration efficiency of the ester product, and yielding DOTP with low APHA (colour) value.Filed 2015-07-28 — an early example of catalyst-driven process claims around DOTP synthesis, a route that recurs throughout the corpus.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | KR1020080105341A | Vinyl chloride based resin composition containing dioctyl terephthalate (DOTP) for wallcoverings | 30 |
| 2 | CN104496819A | 一种废弃资源回收利用制备环保增塑剂的方法 | 29 |
| 3 | CN1636962A | 多品种、低消耗增塑剂生产方法 | 27 |
| 4 | US20130310471A1 | Use of di(isononyl)cyclohexanoate (DINCH) in expandable PVC formulations | 21 |
| 5 | CN102952019A | 苯二甲酸二辛酯生产线及生产DOTP的方法 | 21 |
| 6 | CN103242164A | 环保型增塑剂连续化制备工艺及其装置 | 15 |
| 7 | CN105482311A | 食品级PVC手套及其生产工艺 | 14 |
| 8 | CN105130804A | 环保增塑剂DOTP的生产方法及生产系统 | 11 |
| 9 | CN105001091A | DOTP增塑剂酯化反应工艺 | 11 |
| 10 | CN102659591A | 一种连续催化合成柠檬酸三乙酯增塑剂的方法 | 11 |
Citation counts inside a searched corpus favour older records with more time to accumulate references; treat this table as a map of influence, not of current technical leadership.
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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Four read-throughs from the filing trend, jurisdiction split and citation pattern above.
Filing is concentrated in one office
China accounts for the large majority of tracked filings, with South Korea, Europe, the US, Russia and Taiwan making up single-digit counts each. Freedom-to-operate work outside China draws on a much thinner prior-art base than the headline family count suggests.
The curve has already turned down
Filing peaked at 15 families in 2020 and had eased to 8 by the 2022 midpoint, with the most recent tracked years showing no assignee filing anything at all. Combined with an 18-month publication lag, this looks like a plateaued rather than an emerging area.
Ester synthesis routes dominate classification
Nearly three-quarters of records classify under C07C, the acyclic and carbocyclic compounds subclass covering DOTP and DINCH ester chemistry itself, ahead of C08K additive-formulation claims. Process and catalysis work (B01J) is a distinct, smaller cluster rather than the field's centre of gravity.
Influence sits with early filings
The most-cited record in this corpus is a 2008 wallcoverings formulation, well outside the 2015-2026 filing window tracked here. New entrants should expect to design around foundational claims that predate most of the visible filing activity, not just recent ones.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to non-phthalate plasticizers, with the prior art for and against each one.
Who is filing, and where the gaps sit
Assignee activity in this corpus is dispersed rather than dominated by one or two filers, with several Chinese research institutes and specialty chemical producers among the more active names — and every tracked assignee showing zero filings in the latest year.
Jiangnan University anchors the research-institute cluster
Jiangnan University appears repeatedly in the assignee list and in co-assignee pairings with regional chemical firms and a hospital, suggesting applied research collaborations rather than a single in-house R&D programme. Its latest-year filing count is zero, consistent with the field-wide slowdown.
Korean chemical producers hold a distinct regional pocket
South Korea's 6 tracked families are small in absolute terms but represent the largest non-China filing base, likely tied to DINCH and citrate-ester formulation work aimed at export-grade PVC compounding.
Catalysis claims sit apart from the core chemistry filers
The B01J cluster of 14 families is filed by a partly distinct set of assignees focused on esterification catalysts and reaction efficiency rather than end-use formulation, mirroring the approach in the representative DOTP production patent.
| Assignee | Recent year | YoY |
|---|---|---|
| Jiangnan University | 0 | — |
| Changchun Synthetic Resin Factory Co., Ltd. | 0 | — |
| Research Institute of Forest Products Chemical Industry, Chinese Academy of Forestry | 0 | — |
| Hanwha Solutions Corp. | 0 | — |
| Shandong Langhui Petrochemical Co., Ltd. | 0 | — |
| Ma Haishe | 0 | — |
| Zhang Weihai | 0 | — |
| Blue Sail Medical Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points to a plateaued but still contestable field. Two directions make sense depending on what you're trying to decide.
Check freedom-to-operate outside China
With 68 of 91 families filed via China, a targeted search of the thinner US, EPO and Korean filings is the faster way to assess actual enforcement risk in those markets.
Run a freedom-to-operate searchProbe the under-claimed branches
Citrate ester cold-flex data and DINCH catalyst recycling both show thin coverage relative to core DOTP chemistry — a first-claim opportunity worth scoping before committing R&D spend.
Explore white space in EurekaCommon questions on non-phthalate plasticizer patents
The two dominant chemistries in the patent literature are DOTP (di-octyl terephthalate, sometimes written DEHT) and DINCH (di-isononyl cyclohexanoate), both developed as drop-in or near-drop-in replacements for ortho-phthalates like DEHP in PVC compounding. Citrate ester plasticizers appear as a smaller, distinct chemistry class, generally aimed at more toxicity-sensitive applications such as medical or food-contact PVC. Patent activity concentrates around ester synthesis routes (IPC C07C) and formulation additive claims (C08K), with a smaller catalysis and process cluster underneath both.
No — filing peaked at 15 families in 2020 and had fallen back to 8 by the 2022 midpoint, with the tracked assignees showing no filings at all in the most recent year. Some of that apparent drop-off is a publication-lag artefact, since publication typically trails filing by around 18 months, so the very latest year is always undercounted. But the multi-year trend before the lag window still points to a plateaued rather than accelerating field.
Activity is dispersed across a mix of Chinese research institutes, specialty chemical producers and academic filers rather than concentrated in one or two dominant assignees. Jiangnan University stands out for appearing in multiple co-assignee pairings with regional chemical firms, suggesting collaborative applied research rather than a single corporate R&D pipeline. Notably, every tracked assignee in this dataset shows zero filings in the latest tracked year, reinforcing the overall slowdown.
China is the dominant receiving office by a wide margin, accounting for 68 of the 91 tracked families, with South Korea a distant second at 6. Europe, the US, Russia and Taiwan each contribute only a handful of filings. This means the bulk of the documented prior art — and much of the enforcement risk — sits inside the Chinese patent system, and freedom-to-operate assessments for other markets are working from a much thinner base.
In this corpus, the most-cited records tend to be older filings — the top-cited patent dates to 2008, well before the 2015-2026 window this landscape tracks — because citation counts accumulate over time and older documents have simply had longer to be referenced. A high citation count signals influence on later filings, not that the patent is currently the most commercially important or technically advanced. Newer filings with strong claims may simply not have had time to accumulate citations yet.
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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.