Waterborne Polyurethane Dispersions for Agriculture

SIWO US Inc. is a research-based producer of waterborne polyurethane dispersions (PUDs) tailored for industrial and agricultural applications. Our product line includes both cationic and nonionic waterborne PUDs, enabling formulators to match coating chemistry to specific crop and soil needs. As a leader in sustainable coatings, SIWO’s PUDs use water as the carrier (≤30–60% solids), which virtually eliminates VOC emissions. These dispersions are engineered for high performance – offering excellent adhesion, film-forming strength and durability – while being compliant with stringent environmental and safety standards.

Agricultural Applications

Seed Coating Binders: SIWO’s waterborne PUDs make excellent seed coating binders by forming uniform, continuous films around seed surfaces. These micro-structured coatings (typical particle sizes ~10–100 μm) firmly bond pesticides, micronutrients and protectants to the seed. The strong urethane film resists abrasion and handling stress – preserving coating integrity through processing, storage, and planting. At the same time, the permeable polymer film helps deliver nutrients and bioactives precisely where needed, enhancing early nutrient uptake and germination rates. By improving adhesion and release efficiency, SIWO binders increase seed treatment durability and reduce dust and waste of active ingredients.
Controlled Release Coatings: SIWO’s dispersions are also ideal for controlled release coatings on fertilizer and agrochemical granules. A uniform PUD film forms a semi-permeable shell around each granule, slowing the dissolution of nutrients into the soil. This polyurethane coating can be tuned (via formulation and coating thickness) to regulate nutrient flux over weeks or months. The result is a steady, extended nutrient availability that matches crop uptake curves and minimizes leaching. By choosing appropriate cationic or neutral PUD chemistries, formulators achieve stable, customized controlled-release products that improve fertilizer use efficiency and crop yield.
Specialty Agricultural Films: Beyond coatings, SIWO PUDs can be cast or extruded into specialty agricultural films and membranes. For example, flexible PU films can be used as liners, mulches, anti-transpirant sprays or encapsulating layers in complex formulations. These films combine high mechanical strength with chemical and moisture barriers – for instance, Covestro’s TPU Dureflex films exhibit outstanding puncture, abrasion and chemical resistance while remaining flexible and UV-stable. In practice, SIWO’s PU films offer protective, functional barriers in agrochemical packaging or as sprayable films that adhere tightly to plant or equipment surfaces. The result is durable protection of active ingredients from rain, dust or microbial degradation, further enhancing crop protection efficacy.

Technical Features

SIWO’s waterborne PU dispersions deliver a balance of advanced technical properties:

Film-Forming & Adhesion: The dispersions coalesce into continuous films as water evaporates. By controlling internal surfactant levels (e.g. DMPA content), SIWO achieves nanoscale PU particles that wet and level evenly, yielding defect-free films. Both cationic and nonionic grades are available. Cationic dispersions, for example, provide exceptional adhesion to hydrophobic seed coatings and packaging materials, improving coating integrity on waxy or plastic surfaces.
Water & Chemical Resistance: The cured PU films are highly water-resistant and chemically durable. Formulations based on polyether soft segments (e.g. PTMEG) deliver outstanding hydrolytic stability and moisture barrier performance. This means SIWO coatings remain intact under irrigation or heavy rainfall, and resist wash-off of incorporated agrochemicals. The films also withstand common agrochemicals and UV exposure without significant degradation.
Mechanical Durability: SIWO PUD coatings are exceptionally tough and abrasion-resistant. They provide flexibility and toughness across temperature extremes – maintaining strength in cold conditions and toughness in heat. For instance, TPU films (a type of aliphatic PU) are noted for high tensile strength and abrasion resistance even in sub-zero use. This mechanical resilience ensures that coatings and films survive handling, planting equipment, and soil abrasion without cracking or flaking.
Bio compatibility & Low Toxicity: The polyurethane chemistries are formulated to be safe for plant and soil environments. By selecting bio-based or benign polyol components, SIWO can tailor the biodegradability and bio compatibility of each PUD. Many waterborne PUDs are engineered to resist harmful additives (e.g. heavy metals) and are essentially non-toxic in use. In fact, biodegradable PU options are available for formulations requiring low ecological impact. Overall, SIWO dispersions exhibit excellent life-cycle safety – meeting global food, seed and environmental safety standards.
Low-VOC Sustainability: All SIWO PUD products are waterborne and inherently low-VOC. Unlike solvent-based systems, they virtually eliminate volatile organic emissions during application and curing. This not only ensures compliance with strict air quality and VOC regulations but also makes them safer for workers. The clean, water-based chemistry also enables easy cleanup and integration with other waterborne agrochemical formulations.

Product Advantages

SIWO’s agricultural PUD solutions offer key advantages to agrochemical formulators and manufacturers:

Eco-Friendly & Regulatory Compliant: Waterborne chemistry dramatically lowers emissions and pollution risk. SIWO dispersions meet or exceed environmental regulations (low VOC, low odor) and avoid use of persistent microplastics. In fact, modern PU binders are microplastic-free, meaning they won’t accumulate as long-lived plastic particles in soil or water. This aligns with sustainability mandates and consumer demand for cleaner agriculture.
Exceptional Durability: The PU films are among the most durable coatings available. Covestro’s data show TPU-based films have “outstanding mechanical, chemical and thermal properties,” including resistance to chemicals, moisture and abrasion. In practice, this means seed coatings stay intact through tough processing and drilling, and controlled-release coatings remain intact on fertilizers through heavy rains and heavy machinery. Robust PU barriers also protect sensitive agrochemicals from UV or degradation, extending the product’s effective life in the field.
Formulation Flexibility: SIWO offers a broad range of PUD chemistries and solids content (e.g. 30–60%), enabling customized formulations. Dispersions can be cationic or nonionic, neutral or functional (blocked isocyanates or hydroxyl-terminated), so chemists can tune hardness, flexibility and curing profile. The high-solids waterborne nature means formulators have latitude to adjust viscosity and solids by simply adding water. This flexibility allows easy blending with other agrochemicals, fertilizers or seed treatment agents.
Broad Compatibility: These dispersions are designed to work with many substrates and additives. Whether coating cereal seeds, tropical grains, or pelletized fertilizers, SIWO’s PUDs can be tailored for good adhesion and compatibility. For example, cationic PUDs form strong bonds with waxy or hydrophobic seed coats, while anionic PU can incorporate water-soluble agrochemical packages. The result is consistent performance in diverse soils and weather: coatings cure uniformly and perform in humid tropics or arid plains alike.
Enhanced Field Performance: By improving active ingredient delivery and retention, SIWO PUDs help boost crop performance. For seed treatments, this means higher germination and vigor from precise nutrient delivery. For fertilizers, extended nutrient release can translate to higher yield. These tangible agronomic benefits, combined with easier processing (less dust, better flow), give SIWO dispersions an edge over conventional polymer binders.

Sustainability

SIWO US is committed to supporting green agriculture and reducing the environmental burden of crop protection:

Minimal Pollution Footprint: Waterborne PU cuts VOC emissions to near zero, eliminating an entire class of air pollutants. Unlike some polymer additives, SIWO’s dispersions contain no fluorinated or persistent organics. Notably, many PU binders are made to be microplastic-free – they break down in soil rather than accumulating as particles. This helps prevent long-term plastic buildup in farmland and waterways.
Renewable/Biobased Options: SIWO can incorporate bio-derived polyols (e.g. castor, soy) into dispersions to further reduce carbon footprint. Such bio-based PUDs have been shown to be fully biodegradable and still deliver strong film performance. By choosing renewable raw materials and waterborne processing, SIWO products support a circular economy in agrochemicals and reduce reliance on petrochemicals.
Safer Chemistry: The dispersions avoid heavy metals and toxic co-solvents. Their inherent bio compatibility means they are safe around plants, beneficial insects and soil microbes. Many SIWO PUDs are engineered with plant- or medical-grade purity levels, aligning with organic and integrated pest management (IPM) practices. In sum, SIWO’s technology helps formulators design agrochemical products that meet evolving sustainability standards without sacrificing efficacy.
Regulatory Alignment: With global agriculture moving toward greener regulations, SIWO’s waterborne PUDs provide a ready path for compliance. By eliminating harmful VOCs and plastic residues, customers easily satisfy EPA/FDA/EFSA requirements on emissions, residue limits and biodegradable packaging. SIWO also offers technical support to ensure product formulations meet local agriculture chemical regulations and safety certifications.

For agriculture manufacturers and R&D teams looking for high-performance, eco-conscious binder and coating solutions, SIWO US Inc. offers the expertise and product line to meet your needs. Contact SIWO US Inc. today for technical consultation or custom polyurethane dispersion formulations optimized for your seed treatment, fertilizer, or film applications.

Contact: SIWO US Inc. – Technical Support and Custom Formulation Services (email/phone available on request).

Waterborne Polyurethane Dispersions for Agriculture

Agricultural Applications

Technical Features

Product Advantages

Sustainability

call us

visit us

write us

quick links

Services

Join Our Newsletter