Nanocellulose Paper Strength Patents: Leaders & White Space 2026
- Filings nearly tripled in three years — the 2021-to-2024 span (the last complete filing year) shows +200% growth, from 1 to 3 filings, signalling renewed commercial interest rather than a mature, settled field.
- One IPC subclass dominates the claim space — D21H (pulp & paper compositions) appears in 95.7% of the 47 records in scope, while adjacent water-treatment and separation classes each sit near 15%, pointing to where less-crowded claim territory sits.
- A long tail behind a single leader — the leading assignee holds 10 filings against a fifth-place company at 5 and a tenth-place company at just 1, across 13 ranked companies — a pattern with room for a fast-moving new entrant.
Filing growth compares 2021 (1 records) with 2024 (3) — 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.
What this landscape covers
Nanocellulose-based paper strength additives sit at the intersection of pulp chemistry and specialty polymers: claims here typically cover a nanofibril or nanocrystalline cellulose component, a dosing or addition method, and a measurable effect on tensile, burst strength, drainage or retention. The dataset behind this page spans 47 published records filed between 2015 and mid-2026, drawn from filings that explicitly claim a strength-additive function alongside a papermaking process metric.
Because publication lags filing by roughly 18 months, the most recent one to two years in any trend understate real filing activity — treat 2025 and 2026 figures as still filling in, not as a slowdown.
Filing trend and technology composition
Two views of the same 47-record dataset: filing activity by year, and the IPC subclasses those records carry. Because a single record can carry several IPC classes, subclass shares add up to more than 100% of the record total — that is expected and reflects genuine claim overlap between papermaking chemistry and adjacent fields.
Filing activity, 2017–2026
Filings rose from a single record in 2017 to a peak of 7 in 2019, then continued at a lower but rising rate; the 2021-to-2024 span shows growth of +200%, from 1 filing to 3. 2025 and 2026 figures are partial due to publication lag and should not be read as a decline.
IPC subclass composition
D21H (pulp & paper compositions) covers 95.7% of the 47 records, confirming this is the primary claim category. C08F (addition polymers) reaches 38.3%, reflecting the polymeric flocculant and copolymer chemistry that often accompanies nanofibril additives. B01D, C02F and D21C each sit near or below 15%, marking the separation, water-treatment and pulp-production edges of the field.
Shares are the percentage of the 47 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Nanocellulose as Paper Strength Additive with Eureka
This page is one run against one query. Ask Eureka your own question about nanocellulose as paper strength additive and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited filings
Method of producing holocellulose and paper strength agent (US20220018065A1)
Filed by RISE Innventia, this filing describes producing holocellulose fibres by treating wood-based raw material with an organic peroxide, charged either continuously or in at least two separate steps with an intermediate alkaline treatment. The resulting holocellulose fibres are then used in a papermaking process with a pulp slurry at a specified fibre consistency to produce paper with defined strength characteristics.Abstract trimmed for length; full claim scope should be reviewed directly before relying on it for freedom-to-operate work.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | JP2012087431A | Base paper for paper yarn | 20 |
| 2 | US20050230319A1 | Water-soluble copolymer, polymeric flocculant, and method of dehydrating sludge | 15 |
| 3 | WO2016170230A1 | A composition for use as a paper strength agent | 14 |
| 4 | US20160340831A1 | Acrylamide-based polymer, paper strength agent, and paper | 8 |
| 5 | CN102206302A | 水溶性聚合物分散液、纸力增强剂、造纸用助滤剂和造纸用助留剂 | 7 |
| 6 | CN102153697A | 水溶性聚合物分散液、纸力增强剂、造纸用助滤剂和造纸用助留剂 | 5 |
| 7 | US20220018065A1 | Method of producing holocellulose and paper strength agent, process for the production of paper, the paper pr… | 3 |
| 8 | CN107743534A | 用作纸张增强剂的组合物 | 3 |
| 9 | CN104805733A | 层合纸用纸力增强剂 | 3 |
| 10 | EP1479703A1 | Water-soluble copolymer, polymeric flocculant, and method of dehydrating sludge | 3 |
Citation counts favour older filings inside any searched corpus — read them as a signal of influence on later filers, not as a measure of current commercial importance.
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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Browse MCP servers →What the numbers mean for filing strategy
Three patterns stand out once family-level dedication and citation bias are accounted for.
Renewed filing momentum, not a mature field
The jump from 1 filing in 2021 to 3 in 2024 is a small-number swing, but it runs against a field that peaked once already in 2019 at 7 filings and then cooled. High density in the peak year meant claim space around core D21H compositions was occupied; the recent uptick suggests entrants are finding new angles rather than repeating that peak.
Almost everyone files in the same subclass
Near-universal presence of D21H means the core pulp-and-paper composition claim space is densely occupied. Differentiation is happening instead in the secondary classes — C08F addition polymers at 38.3%, and B01D/C02F separation and water-treatment classes each near 15% — where fewer filers compete for claim room.
One leader, a long single-filing tail
The leading assignee's 10 filings sit well ahead of the fifth-place company's 5 and the tenth-place company's single filing. With only 13 companies in the ranked set, the field has not consolidated into a handful of dominant players — there is still room for a new entrant to build a position quickly.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to nanocellulose as paper strength additive, with the prior art for and against each one.
Who is filing, and where the gaps sit
The ranked assignee set is small — 13 companies — with filing activity concentrated in Japanese, Nordic and Finnish papermaking and chemical groups. Recent-year momentum across the tracked assignees shows zero filings in the latest year for each, consistent with publication lag rather than a real pullback.
A clear leader with room behind it
The top-ranked assignee holds roughly double the filings of the fifth-place company, but the gap to the rest of the field is not so wide that it forecloses new entry — especially in the secondary IPC classes where filing density is lower.
One research-industry pairing stands out
The strongest co-assignee link in this dataset is a Nordic research institute pairing with 5 shared filings, pointing to a sustained joint R&D programme rather than one-off collaboration.
Filing activity is Asia- and Europe-weighted
Japan and China lead as receiving offices, with EPO and the United States close behind and Australia and Canada each smaller but present. That spread suggests filers are already pursuing multi-jurisdiction protection rather than filing domestically only.
| Assignee | Recent year | YoY |
|---|---|---|
| Kemira Oyj | 0 | — |
| Toagosei Co., Ltd. | 0 | — |
| Arakawa Chemical Industries, Ltd. | 0 | — |
| RISE Innventia AB | 0 | — |
| RISE Research Institutes of Sweden AB | 0 | — |
| Harima Chemicals, Inc. | 0 | — |
| Oji Holdings Corporation | 0 | -100% |
| Mitsubishi Paper Mills Limited | 0 | — |
Where to take this analysis
The trend and composition data point to specific next steps for teams deciding where to file or where to look for freedom to operate.
Check freedom to operate against the densest class
With 95.7% of records carrying a D21H classification, any new filing claiming a paper-strength composition should be checked against that subclass first, then against the secondary C08F polymer claims.
Explore D21H filings in EurekaWatch the Nordic research-institute pairing
The strongest co-assignee link in this dataset points to an active joint programme; tracking its continuation filings is a low-cost way to anticipate the field's next technical direction.
Track assignee activity in EurekaRevisit 2025–2026 figures once they mature
Because publication lags filing by around 18 months, the true 2025 and 2026 filing counts will only become visible over the next reporting cycles; re-check the trend before concluding the recent growth has stalled.
Set up a filing alert in EurekaCommon questions on nanocellulose paper strength patents
In this dataset, a filing qualifies if it claims a nanofibril or nanocrystalline cellulose component together with a measurable papermaking effect such as tensile strength, burst strength, drainage behaviour, dewatering penalty, retention or a specific dosing point. Most such filings are classified under IPC D21H, which covers pulp and paper compositions, and appear in 95.7% of the 47 records in this landscape. Filings that only describe nanocellulose production without a paper-strength claim, or strength agents that are not cellulose-nanofibril-based, generally fall outside this scope.
The ranked set contains 13 companies, with the leading assignee holding 10 filings, the fifth-ranked company holding 5, and the tenth-ranked company holding just 1. Filers span Japanese papermaking and chemical groups alongside Nordic and Finnish research institutes and chemical companies. The spread suggests an active but not yet consolidated field, where a well-timed filing could still build a meaningful position.
Filing activity peaked at 7 records in 2019, then activity in the most recent complete years shows renewed growth: filings rose from 1 in 2021 to 3 in 2024, a +200% increase over that span. Figures for 2025 and 2026 are still incomplete because patent publication typically lags actual filing by around 18 months, so those years should not be read as a slowdown. The honest read is renewed momentum following an earlier peak, not a field in decline.
The core D21H pulp-and-paper composition space is densely filed, appearing in 95.7% of the 47 records in scope, so competing there means designing tightly around existing claims. Less crowded ground sits in the secondary classes: C08F addition polymers appear in 38.3% of records, while B01D separation processes, C02F water treatment and D21C pulp production each sit near or below 15%. Sub-areas such as drainage-neutral dosing methods, sludge-dewatering flocculant crossover applications and holocellulose pre-treatment routes show lower filing density and are worth a closer freedom-to-operate check before committing resources.
Citation counts inside any searched patent corpus tend to favour older filings simply because they have had more time to be cited by later applicants, so a high citation count is a signal of historical influence rather than current commercial importance. The most-cited record in this dataset dates to 2012, well before the more recent 2019 filing peak. When evaluating current freedom to operate or licensing risk, recent filings with fewer citations may matter just as much as older, heavily cited ones.
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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.