# Water-Based & Fiber-Based Adhesive Systems for Sustainable Packaging & Medical Applications

Topic radar · 660 documents · 2021-01-01–2026-11-03 · updated 2026-10-31

Canonical: https://slate.greyb.com/radar/water-based-fiber-based-adhesive-systems-for-sustainable-packaging-medical-applications/innovations

## In one minute

### Water does two jobs, and the second one sets the formulation target
A water-borne adhesive is applied without solvent, and the same water, or the alkali a recycler already runs, becomes the release mechanism. One acrylic paper-tape adhesive claims a dissociation rate of 98% or more in alkaline water at pH 9 to 12 [1]. A two-stage emulsion builds the trigger into the particle itself: a carboxylate-rich first-stage copolymer acts as seed, emulsifier and stabiliser, and the second stage grafts onto it, so the dried film disperses under neutral or basic conditions [2]. The tape work goes further and makes both faces water-dissociable, the silicone release coat included [3].

The practical consequence is that the specification a formulator writes is a dissolution pH or a wash temperature, and peel strength sits underneath it as a constraint.

1. [KR20230163666A](/?paper=KR20230163666A&utm_source=radar&utm_medium=dashboard)
2. [WO2021249660A1](/?paper=WO2021249660A1&utm_source=radar&utm_medium=dashboard)
3. [KR20260112867A](/?paper=KR20260112867A&utm_source=radar&utm_medium=dashboard)

### The recycling approval exists for plastic streams, and paper coatings are sold without one
Dow's water-borne ROBOND L-350/CR-3 is one of two adhesive systems RecyClass approved as compatible with mechanical recycling of polyethylene film, an approval the company presents as opening the way for converters and brand owners to improve the recyclability of laminated flexible packs. Sun Chemical's four SunLam adhesives carry the same approval against European flexible PE streams. Both are verdicts issued by a recycler-led body against a process that already runs.


### One company has taken the sterile-barrier heat seal, and taken it narrowly
The largest single run of filings by one organisation in the recent record belongs to BenQ Materials, and it is not a spread of experiments. It is one water-based hot-melt heat-seal platform, extended across Taiwan, the United States, China and Europe as the same chemistry with adjusted numbers.


### A coated heat-seal paper that states seal strength and pulp yield together
I read the seal-coating line as having no document that pairs a seal-strength figure with a pulper yield on the same coated sample. One filing does. Oji's heat-seal paper specifies a dried coating of 1 to 50 g/m² from a water-dispersible styrene/butadiene or ethylene-(meth)acrylic acid binder at 30 to 100% by mass of the layer, sealed at 150 °C and 0.2 MPa for one second, and requires a hot-tack peel distance of 150 mm or less, peel strength of at least 2 N/15 mm and pulp recovery of at least 85%. The values are the applicant's own targets, not third-party results, but the measurement is stated as one specification.


### What gets published is what fits in a compliance file
Henkel sells its bio-based hot melt on 49% directly bio-based content, 30% ISCC-certified mass-balanced material and a processing temperature up to 40 °C lower. Power Adhesives sells Tecbond 214B on 44% bio-based material and ASTM D6400 and EN13432 certification. Dongsung and CJ Biomaterials sell their PHA hot melt on Din Certco biobased certification, room-temperature bonding through existing nozzles and paper-to-aluminium adhesion.


### The word "plastic" is the fork nobody has priced
In July 2026 the German Federal Environment Agency said that most water-based barrier dispersions applied to paper and board are technically synthetic polymer coatings, and therefore count as plastic coatings under the Single-Use Plastics Directive.


### The wax and the binder are specified as a pair
Wax in a heat-seal layer is not a top-up additive. Oji matches carnauba wax to the ethylene-acrylic binder and paraffin wax to the styrene-butadiene one, because the lubricant has to be compatible with the resin that carries it. DIC splits the job across two layers: a styrene-acrylic resin layer under a heat-seal layer of an olefin–α,β-unsaturated carboxylic acid copolymer whose acid content is held at 8 to 24% by weight, with 18 to 23% described as the optimum, to balance aqueous dispersibility against blocking resistance.


### A claim tested on someone's machine is worth more than a collaboration announced
Bostik reports Kizen LIME's up to 65% adhesive saving and its 120 to 135 °C window from runs on IMA's MMP400 wrap-around case packer and AC200 cartoner. The testing party is not a laboratory but the equipment builder the buyer will actually run, which makes the result transferable without a trial of the buyer's own.


## Overview


Every area of this topic resolves to the same shift: what used to be sold as a property is now a measurement, and the measurement has moved away from the adhesive.


## What's new


Dongsung Chemical and CJ Biomaterials put ECOVIVA, a PHA-based hot melt built on CJ's PHACT A1000P biopolymer, into the US market on 14 October. COSMAX, the Korean cosmetics contract manufacturer, already runs it on eyeshadow packaging under a 2030 plastics commitment, which is what makes the launch a commercial event rather than a product page.


## Research

### Cold seal reaches compostability by leaving out the acrylic and the vinyl acetate
Sun Chemical's cold-seal cohesive uses natural rubber latex, a biodegradable resin and water, applied wet by rotating etching cylinder and dried in an oven. It claims a T-seal strength of 3.0 to 5.0 N/25 mm with blocking below 1 wt%, compliance with EN13432, and formulations with low or no acrylic or vinyl acetate emulsion. The stated targets in the filing are chocolate and pharmaceuticals.


### Starch board glues are dropping borax and caustic soda
A conventional corrugated glue still runs cornstarch with borax at roughly 1 to 2 parts per 100 parts starch, dimethylol dicyandiamide at 20 to 30 parts, and sodium hydroxide to set pH over a 60 to 70 minute reaction. The replacements attack the rheology directly. C.I.P. uses a cross-linked carbomer with an alkali metasilicate, at a carbomer-to-metasilicate ratio above 0.50 and no more than 2.50, to raise viscosity and lower the starch gel point without boron or strong base.


### The starch line is tuned by motor load and pH
What these filings record as a result is process state. One sets its gelatinisation endpoint by watching the stirring motor's current stabilise. Another specifies enzyme reaction at 40 to 50 °C for two hours, gelatinisation at 60 to 70 °C for 40 to 60 minutes, and a final pH of 7.5 to 8.5. A third gives a 60 to 70 minute reaction window.


### Paper tape moves the separation into the coating stack
A water-dissociable paper tape is built as a stack, with each layer specified numerically. One puts a polyvinyl alcohol primer of 12.5 to 14.5 parts in 85.5 to 87.5 parts water between the kraft sheet and the silicone, then an adhesive of 45 parts butyl acrylate, 3 parts acrylic acid, 2 parts surfactant and 50 parts water, cured and aged at controlled temperature. A later filing makes the release layer itself dissolvable, using a silicone oil with methacrylic, carbinol or diamine functionality and a surfactant at an HLB of 10 to 20, aged 70 to 85 hours at 20 to 60 °C.


### Three release triggers live inside the same acrylic
BASF's recycling-compatible label adhesive uses an aqueous acrylic with a tackifier below 5 °C glass transition and releases at moderate wash temperature; because the label film is not water-permeable, the design needs no perforation. UPM Raflatac's linerless wash-off label puts the specification in the facestock: a paper face with wet strength resin absorbing 10 to 30 g/m² under ISO 535 at 60 seconds contact. A third approach uses a phase-separated domain, an amide wax kept incompatible with the acrylic at 2 to 22% of dry weight, giving clean removal from PET at room temperature.


### Where water cannot reach the adhesive, the coating pattern opens a path
On a facestock that water cannot cross, the document specifies geometry instead of chemistry. Nippon Zeon claims either a continuous non-adhesive margin at least 0.5 mm wide around the adhesive layer, or through-holes of 1000 µm average diameter or less in the base material. A label filing divides the adhesive into sections separated by adhesive-free areas wider than the cutter thickness. One breathable tape runs a vent through both the base layer and the adhesive, with the opening narrowing away from the skin side. A dot-pattern tape prints adhesive only into the recessed areas of a burn-out woven substrate at 10 to 50% porosity, leaving the raised areas bare as channels.


### The skin adhesive is pinned to a water-vapour rate and the rig that measures it
Nitto specifies at least 900 g/(m²·24h), measured by forming a laminate of a 25 µm adhesive layer on a 30 µm polyurethane film, closing a water-filled vessel with it, and holding it at 40 °C and 30% relative humidity for 24 hours, then weighing the water that passes per unit opening area. The test is written into the claim, which is what turns a comfort property into a pass or fail.


### Removal force is built as a liquid layer inside the adhesive
Nitto's low-trauma adhesive adds an organic liquid of molecular weight 1500 to 7000 and hydrophobicity of 38 to 75%, at 1 to 15 parts per 100 parts acrylic polymer, which partitions to the polymer particle surfaces, plasticises them and forms a weak boundary layer. That gives adhesion on sweaty skin and clean peeling afterwards. A related filing holds the same copolymer family, an alkyl (meth)acrylate with carboxyl, nitrogen-bearing and silane monomers, and pairs it with a polyol liquid.


### The acrylic's weak point is a small mobile molecule, and four filings bind it
A reactive surfactant copolymerises into the acrylic chain instead of sitting free in the film, which stops hydrophilic islands migrating and swelling and keeps haze low after damp storage. Korea's chemistry institute specifies a reactive nonionic surfactant with 9 to 15 ethylene oxide and 1 to 7 propylene oxide units at 0.01 to 5 parts per 100 parts monomer. Wingtai pairs a nonionic fatty alcohol ether phosphate with a reactive vinyl alcohol ether phosphate at 7 to 20 to 1. Two more filings use 0.5 to 1.5 parts reactive emulsifier alongside 0.5 to 1.5 parts conventional anionic, and 1 to 4 parts reactive alone.


### Higher solids come from packing two particle sizes
Organik Kimya's biodegradable pressure-sensitive adhesive carries at least 60 wt% solids at workable viscosity by using two particle populations whose average sizes differ by at least a factor of 1.5, together making up at least 70 wt% of the polymer. Small particles fill the gaps between large ones, so the packing fraction rises before the viscosity does.


### Fibre is going inside the adhesive
Kuraray disperses cellulose nanofibres at 0.1 to 40 parts per 100 parts of an ethylene-vinyl alcohol copolymer with 1 to 20 mol% ethylene, in a medium that is at least 40 mass% water, for use as coating, adhesive or multilayer film. Åbo Akademi takes the opposite arrangement: the polysaccharide is allylated with allyl glycidyl ether and acrylic monomer is then grafted onto it by emulsion polymerisation, making the fibre the backbone of the latex. Dow puts 1 to 7 wt% nanocellulose of 10 to 1000 aspect ratio into a waterborne acrylic laminating adhesive with 1 to 5 wt% isocyanate, aimed at oxygen and water barrier rather than bond strength.


### On barrier laminates, water becomes the problem
Stora Enso bonds a microfibrillated cellulose film of at least 50 wt% MFC to board using a melt adhesive of at least 50 wt% water-soluble thermoplastic, and the method insists the adhesive is applied low-solvent or solvent-free. A wet coat cockles the moisture-sensitive film. The targets are a water-vapour transmission rate below 30 cc/m²/24h, preferably below 5, and a repulping reject rate below 20%, preferably 15%.


### The medical barrier is a heat seal, while the aqueous chemistry stays on skin
The medical packaging that appears in these documents is sealed rather than glued. Guyenne Papier's coated support heat-seals coated face to coated face for pharmaceutical, food and cosmetic packs, from 90% natural material. Oji's and DIC's heat-seal papers bond through a resin layer melted under pressure, with no adhesive chemistry at the interface.


## Market

### The most completely specified coating reached market inside the group that validates it
BenQ's filings state the whole interface numerically: 30 to 60 wt% wax and tackifier particles, 1 to 5 g/m² on medical paper, above 300 g/15 mm seal strength and Gurley porosity under 600 seconds so sterilant gas still passes. Publicly that chemistry is now sold as SIGSeal, a water-based coating for Tyvek described as preserving the sheet's breathability while heat-sealing, with the seller stating it adheres to ISO 11607 and that testing runs through a group laboratory accredited to ISO 17025.


## Strategy

### Borax-free has become a labelling claim, not a chemistry one
Crespel & Deiters is selling Definol as borax-free with no additional labelling or documentation, and separately offers a Zerobor range that is fully boron-free, which means the headline product still uses other boron compounds.


### The corrugated glue is being filed by the plants that run it
The 2026 starch work is largely not coming from adhesive companies. A machine builder reached 70 wt% solids with neither caustic soda nor borax. A corrugated producer crosslinked starch with a transglutaminase and amylase system plus nano-silicate. A paper mill built nanocellulose and a paraffin microemulsion into its moisture-proof glue. A board maker and a packaging firm filed their own modified-starch formulations.


### Cold seal's exclusion right did not survive being tested
In August 2026 the Unified Patent Court's Paris local division revoked Bostik's cold-seal packaging patent and dismissed its infringement action against six Henkel entities over two Loctite Liofol cold-seal products, with the patent already expired and Bostik pursuing damages.


## Areas

- Packaging & Paperboard Applications · 206 documents
- Polymer & Chemistry Platforms · 193 documents
- Medical & Healthcare Applications · 130 documents
- Labeling, Tapes & Converting · 74 documents
- Market Sizing, Launches & M&A · 57 documents