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Polyester Polyol For Adhesives is a high-performance polyol specifically engineered for formulating urethane-based adhesives, characterized by its balanced reactivity with isocyanates and exceptional substrate adhesion. Designed with linear to slightly branched molecular structures, these polyols are tailored to optimize chain flexibility and cross-link density in cured adhesives. Key technical attributes include hydroxyl numbers (OHN) ranging from 100–300 mg KOH/g and viscosity levels of 2,000–15,000 cps at 25°C, which ensure seamless compatibility with MDI, TDI, and various polyisocyanate prepolymers. Their low acid value (≤2.0 mg KOH/g) minimizes ester hydrolysis, while water content ≤0.1% prevents unwanted side reactions during curing—both critical factors for maintaining long-term adhesive stability. This polyol series finds primary application in flexible packaging laminations, woodworking bonds, and automotive interior assemblies, where it consistently delivers shear strength ≥5 MPa and peel adhesion ≥3 N/cm across diverse substrates .
Superior Adhesion Profile
This polyol exhibits strong bonding capabilities to a broad range of substrates, including polar materials like aluminum, glass, and cotton textiles, as well as low-surface-energy substrates such as polypropylene (when properly pretreated with plasma or primers). The optimized hydroxyl group distribution along its molecular chain enhances wetting of substrate surfaces, while its controlled molecular weight (2,000–5,000 g/mol) promotes interdiffusion with adherend interfaces—key mechanisms driving adhesion strength. In comparative tests, adhesives formulated with this polyol showed 15–20% higher peel strength on PET films than those using standard polyether polyols .
Thermal and Hydrolytic Stability
Engineered for durability, the polyol resists thermal degradation at temperatures up to 150°C, making it suitable for applications exposed to elevated heat, such as engine compartment components and electronics encapsulation. Its hydrolytic resistance is validated by weight loss ≤5% after 1,000 hours of immersion in 70°C deionized water, outperforming many polyester polyols in humid environments like food packaging and bathroom furniture bonding. This stability ensures adhesive performance remains consistent over extended service life .
Formulation Flexibility
Available in low-viscosity grades (2,000–5,000 cps) and high-functionality grades (OHN 250–300 mg KOH/g), this polyol accommodates diverse adhesive requirements:
Low-viscosity variants enable solvent-free formulations for flexible packaging, reducing environmental impact and simplifying regulatory compliance.
High-functionality grades support rigid structural adhesives for load-bearing applications, allowing formulators to adjust cross-link density to achieve desired tensile strength and elongation.
This versatility extends to cure speed customization (5–30 minutes) through catalyst selection, adapting to both high-speed assembly lines and manual application processes .
Environmental Compliance
Free from brominated flame retardants, heavy metals, and formaldehyde releasers, this polyol complies with REACH Annex XVII restrictions and meets FDA 21 CFR 175.105 standards for indirect food-contact applications. Select grades incorporate ≥50% bio-based feedstocks (derived from renewable resources like vegetable oils), reducing carbon footprint and aligning with circular economy initiatives in sustainable manufacturing .
Flexible Packaging
Laminating Adhesives: Used in solvent-free and aqueous lamination systems to bond BOPP films, PET substrates, and aluminum foil for snack packaging and retort pouches. These adhesives achieve peel strength ≥4 N/cm and maintain integrity under heat sealing temperatures ≥120°C, ensuring package hermeticity .
Stand-Up Pouches: Enhances moisture barrier performance for processed foods and beverages, with water vapor transmission rate (WVTR) ≤5 g/m²/24h—critical for extending shelf life of hygroscopic products .
Woodworking and Furniture
Edge Banding: Bonds PVC edge strips, ABS profiles, and wood veneers to particleboard and MDF, delivering shear strength ≥8 MPa and resisting delamination during cyclic humidity testing (ASTM D905). This ensures furniture edges remain intact through seasonal moisture changes .
Structural Laminates: Integral to engineered wood products such as glulam beams and plywood panels, providing load-bearing capacity ≥20 MPa and enabling the construction of lightweight, high-strength wooden structures .
Automotive and Industrial
Interior Trim Assembly: Bonds textile upholstery, polyurethane foams, and ABS plastics in door panels, dashboard components, and headliners. Adhesives formulated with this polyol emit ≤5 ppm VOCs, meeting stringent automotive interior air quality standards .
Electronics Encapsulation: Forms hermetic seals for LED drivers, sensor modules, and circuit boards, protecting sensitive electronics from moisture and dust while passing UL 94 V-0 flame tests at 1.6mm thickness .
Container: Store in sealed stainless steel or HDPE drums to prevent moisture absorption, which can compromise reactivity.
Conditions: Maintain storage temperatures between 15–30°C with relative humidity ≤60%, away from direct sunlight and strong oxidizing agents (e.g., peroxides).
Handling: Avoid prolonged contact with amine catalysts or isocyanates prior to formulation, as this may trigger premature curing.
Parameter | Low-Viscosity Grade | High-Functionality Grade |
Appearance | Clear to pale yellow liquid | Amber viscous liquid |
Hydroxyl Number | 100–150 mg KOH/g | 250–300 mg KOH/g |
Viscosity (25°C) | 2,000–5,000 cps | 8,000–15,000 cps |
Acid Value | ≤1.0 mg KOH/g | ≤2.0 mg KOH/g |
Water Content | ≤0.1% | ≤0.1% |
Bio-Based Content | 0–50% | 0–30% |
Polyester Polyol For Adhesives is a high-performance polyol specifically engineered for formulating urethane-based adhesives, characterized by its balanced reactivity with isocyanates and exceptional substrate adhesion. Designed with linear to slightly branched molecular structures, these polyols are tailored to optimize chain flexibility and cross-link density in cured adhesives. Key technical attributes include hydroxyl numbers (OHN) ranging from 100–300 mg KOH/g and viscosity levels of 2,000–15,000 cps at 25°C, which ensure seamless compatibility with MDI, TDI, and various polyisocyanate prepolymers. Their low acid value (≤2.0 mg KOH/g) minimizes ester hydrolysis, while water content ≤0.1% prevents unwanted side reactions during curing—both critical factors for maintaining long-term adhesive stability. This polyol series finds primary application in flexible packaging laminations, woodworking bonds, and automotive interior assemblies, where it consistently delivers shear strength ≥5 MPa and peel adhesion ≥3 N/cm across diverse substrates .
Superior Adhesion Profile
This polyol exhibits strong bonding capabilities to a broad range of substrates, including polar materials like aluminum, glass, and cotton textiles, as well as low-surface-energy substrates such as polypropylene (when properly pretreated with plasma or primers). The optimized hydroxyl group distribution along its molecular chain enhances wetting of substrate surfaces, while its controlled molecular weight (2,000–5,000 g/mol) promotes interdiffusion with adherend interfaces—key mechanisms driving adhesion strength. In comparative tests, adhesives formulated with this polyol showed 15–20% higher peel strength on PET films than those using standard polyether polyols .
Thermal and Hydrolytic Stability
Engineered for durability, the polyol resists thermal degradation at temperatures up to 150°C, making it suitable for applications exposed to elevated heat, such as engine compartment components and electronics encapsulation. Its hydrolytic resistance is validated by weight loss ≤5% after 1,000 hours of immersion in 70°C deionized water, outperforming many polyester polyols in humid environments like food packaging and bathroom furniture bonding. This stability ensures adhesive performance remains consistent over extended service life .
Formulation Flexibility
Available in low-viscosity grades (2,000–5,000 cps) and high-functionality grades (OHN 250–300 mg KOH/g), this polyol accommodates diverse adhesive requirements:
Low-viscosity variants enable solvent-free formulations for flexible packaging, reducing environmental impact and simplifying regulatory compliance.
High-functionality grades support rigid structural adhesives for load-bearing applications, allowing formulators to adjust cross-link density to achieve desired tensile strength and elongation.
This versatility extends to cure speed customization (5–30 minutes) through catalyst selection, adapting to both high-speed assembly lines and manual application processes .
Environmental Compliance
Free from brominated flame retardants, heavy metals, and formaldehyde releasers, this polyol complies with REACH Annex XVII restrictions and meets FDA 21 CFR 175.105 standards for indirect food-contact applications. Select grades incorporate ≥50% bio-based feedstocks (derived from renewable resources like vegetable oils), reducing carbon footprint and aligning with circular economy initiatives in sustainable manufacturing .
Flexible Packaging
Laminating Adhesives: Used in solvent-free and aqueous lamination systems to bond BOPP films, PET substrates, and aluminum foil for snack packaging and retort pouches. These adhesives achieve peel strength ≥4 N/cm and maintain integrity under heat sealing temperatures ≥120°C, ensuring package hermeticity .
Stand-Up Pouches: Enhances moisture barrier performance for processed foods and beverages, with water vapor transmission rate (WVTR) ≤5 g/m²/24h—critical for extending shelf life of hygroscopic products .
Woodworking and Furniture
Edge Banding: Bonds PVC edge strips, ABS profiles, and wood veneers to particleboard and MDF, delivering shear strength ≥8 MPa and resisting delamination during cyclic humidity testing (ASTM D905). This ensures furniture edges remain intact through seasonal moisture changes .
Structural Laminates: Integral to engineered wood products such as glulam beams and plywood panels, providing load-bearing capacity ≥20 MPa and enabling the construction of lightweight, high-strength wooden structures .
Automotive and Industrial
Interior Trim Assembly: Bonds textile upholstery, polyurethane foams, and ABS plastics in door panels, dashboard components, and headliners. Adhesives formulated with this polyol emit ≤5 ppm VOCs, meeting stringent automotive interior air quality standards .
Electronics Encapsulation: Forms hermetic seals for LED drivers, sensor modules, and circuit boards, protecting sensitive electronics from moisture and dust while passing UL 94 V-0 flame tests at 1.6mm thickness .
Container: Store in sealed stainless steel or HDPE drums to prevent moisture absorption, which can compromise reactivity.
Conditions: Maintain storage temperatures between 15–30°C with relative humidity ≤60%, away from direct sunlight and strong oxidizing agents (e.g., peroxides).
Handling: Avoid prolonged contact with amine catalysts or isocyanates prior to formulation, as this may trigger premature curing.
Parameter | Low-Viscosity Grade | High-Functionality Grade |
Appearance | Clear to pale yellow liquid | Amber viscous liquid |
Hydroxyl Number | 100–150 mg KOH/g | 250–300 mg KOH/g |
Viscosity (25°C) | 2,000–5,000 cps | 8,000–15,000 cps |
Acid Value | ≤1.0 mg KOH/g | ≤2.0 mg KOH/g |
Water Content | ≤0.1% | ≤0.1% |
Bio-Based Content | 0–50% | 0–30% |
