Elastomeric Waterborne PU Dispersions

SIWO US Inc. offers advanced elastomeric waterborne polyurethane dispersions (PUDs) engineered for flexibility and durability. SiwoPUD-3060 is a 60%-solid aliphatic dispersion based on polycarbonate diols, while PUE-2013F is a 45%-solid polyester–carbonate PUD. Both are solvent-free, thermoplastic PUD systems that enable high-solids, low-VOC formulations. These dispersions deliver exceptional stretch and strength – for example, SiwoPUD-3060 films achieve ~780% elongation with 31.8 MPa tensile strength – making them ideal for coating and adhesive applications demanding rubber-like elasticity. Their polycarbonate-based soft segments impart excellent hydrolytic stability and mechanical durability, while the aliphatic chemistry ensures non-yellowing performance. Overall, these products blend high-elongation PU character with formulation versatility (compatible with 1K or optional waterborne 2K crosslinkers) to meet diverse application needs.

Technical Features: Balanced Hard and Soft Segments

The unique microstructure of SiwoPUD-3060 and PUE-2013F balances long-chain “soft” polyol segments with rigid “hard” urethane domains. The soft segments come from high-molecular-weight polycarbonate or polyester–carbonate diols, which provide rubbery flexibility. The hard segments (aliphatic diisocyanates and short chain extenders) form reinforcing domains that boost strength and shape recovery. This synergy yields films with high-elongation PU behavior: e.g. SiwoPUD-3060 stretches to ~780% elongation (permitting extreme flexibility) while maintaining strong tensile load-bearing. The result is a low-modulus (soft) film that can bear high strain without breaking. The aliphatic (non-aromatic) isocyanate chemistry also gives these PUDs excellent UV, weather, and heat resistance, and the carbonate content enhances hydrolysis and chemical resistance. Importantly, the dispersions form non-crosslinked, thermoplastic PUD films, meaning the cured coating remains thermally re-meltable and re-dispersible under heat or water – a feature that can enable material reuse and recycling. pH and freeze-stable, these aqueous dispersions are free of NMP/DMAC solvents and are easily formulated into 1K or 2K (with waterborne polyisocyanate) systems to further enhance hardness or chemical resistance.

Application Areas (Across Industries)

Flexible Coatings: Protective and decorative coatings for wood, metal, plastics, and concrete that require elasticity. These dispersions form tough, abrasion-resistant films with excellent water and weather resistance. Examples include elastomeric architectural finishes, industrial floor and equipment coatings, and sealants.
Textile & Leather Finishes: Coatings and binders for synthetic leather, fabrics, footwear, and nonwovens. The films stretch with the substrate without cracking, and their breathability and adhesion make them ideal for shoe/garment laminates and leather coatings. SIWO notes that SiwoPUD-3060 is “suitable for elastic construction coatings and thick coating printing on fabric”, highlighting its use in screen-printable textile paints.
Adhesives and Sealants: Waterborne adhesives for bonding textiles, leather, rubber, plastics and wood. The PUE-2013F product, in particular, is marketed for glue (adhesive) production – it is “used in glue production and textile printing industry” – due to its soft film and strong tack. These PUDs create elastic, resilient bonds in footwear, apparel, and flexible packaging adhesives.
Printing & Packaging: Binder for water-based inks and coatings. The dispersions’ flexibility and high elongation suit them to elastomeric inks, screen printing, and coated fabrics used in packaging and technical textiles.
Automotive & Industrial Fabrics: Interior and exterior coatings or adhesives for automotive upholstery, industrial hoses, and cable jacketing. The combination of UV stability and mechanical resilience makes these PUDs suitable for demanding automotive, marine and industrial fabric applications.

Product Advantages

Outstanding Mechanical Performance: These PUDs combine high-elongation PU stretch with high tensile strength. SiwoPUD-3060 exhibits ~780% elongation and 31.8 MPa tensile strength, meeting tough flexibility and load requirements. Enhanced elasticity and strength arise from optimized polycarbonate soft segments and hard urethane domains.
Excellent Durability: Films resist UV, yellowing, moisture, heat and abrasion. SIWO highlights features like yellowing resistance, UV/weather resistance and reduced wear, meaning coatings remain stable and intact over time. Hydrolysis resistance is also very high thanks to the carbonate chemistry.
Fast Drying & High Solids: Formulators benefit from high solids (low shrinkage) and quick dry times. The SiwoPUD-3060 dispersion is noted for fast curing and can accept waterborne crosslinkers for a 2K process, improving hardness and solvent resistance if needed. In practice, these systems let manufacturers coat rapidly without solvents, boosting productivity.
Broad Compatibility: Both anionic and cationic binders can be co-formulated, and the PUDs adhere to diverse substrates (fabric, leather, metal, plastics). The dispersions are stable in mixed systems and can incorporate additives and extenders with minimal coagulation, giving formulators flexibility.
Environmental & Safety Profile: The chemistries are very clean – they contain no NMP, NEP, DMAC, organotins, heavy metals or formaldehyde. This free-of-toxic-substances formulation meets strict environmental regulations. Moreover, ISO 14001 (environmental) certified production and the waterborne nature dramatically reduce VOC emissions.

Sustainability Benefits

Low VOC / Solvent-Free: As waterborne systems, these PUDs eliminate the need for organic solvents. They are certified NMP/DMAC-free and meet or exceed global VOC regulations, improving workplace safety and reducing greenhouse gas impact.
Green Chemistry Compliance: By design, the products contain no heavy metals, formaldehyde or tin catalysts. This aligns with global green building and environmental standards for coatings and adhesives. End formulations can often earn eco-label qualifications.
Energy & Resource Efficiency: High solid content (60% and 45%) means less water to evaporate, lowering drying energy. Water clean-up is simple and avoids hazardous waste. The thermoplastic PUD nature further allows for coating rework or recycling of polymers under heat, supporting circular economy goals.
Corporate Sustainability: SIWO US manufactures under ISO 9001 and ISO 14001 systems, reflecting a research-driven commitment to quality and environmental management. Together, these dispersions provide high-performance elastomeric coatings and adhesives without sacrificing green credentials, embodying SIWO’s focus on innovative, environmentally conscious solutions.

Ready to develop high-performance, sustainable polyurethane solutions? Contact SIWO US Inc. today to discuss your application needs and request technical specifications or samples.

Elastomeric Waterborne PU Dispersions

Technical Features: Balanced Hard and Soft Segments

Application Areas (Across Industries)

Product Advantages

Sustainability Benefits

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