Innovations in Water Based Solvent Free Adhesives

Water-based adhesive for food packaging that provides superior adhesion properties while being environmentally friendly and recyclable. The adhesive comprises a resin-solid content and a solvent, with the resin-solid content comprising a combination of thermoplastic resin, thermosetting resin, and other polymers. The adhesive is formulated to achieve strong adhesion while maintaining water solubility, making it suitable for single-component packaging applications. The adhesive can be used in various packaging formats, including pouches, containers, and laminated structures, and can be formulated to meet specific thermal processing requirements.

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Environmentally friendly water-based adhesive for food packaging bags, comprising methacrylic acid, butyl methacrylate, vinyl acetate/tertiary carbonate/acrylate copolymer, polyethylene glycol 1000, ammonium persulfate, ethylene-acrylic acid copolymer, modified nano-calcium carbonate, cross-linking agent, emulsifier, and deionized water. The adhesive is prepared by first mixing methacrylic acid,

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Solvent-free polyurethane adhesive with enhanced bonding strength and wear resistance, achieved through a novel preparation method that addresses the conventional limitations of solvent-free polyurethane adhesives. The adhesive is prepared through a two-step process involving a water-absorbing agent and an alkaline stabilizer. The stabilizer absorbs gas generated during isocyanate-water reaction, creating an alkaline environment that promotes curing. The stabilizer's porous structure enables alcohol molecules to penetrate and enhance adhesion. This combination of gas absorption and molecular penetration enables superior bonding performance in solvent-free polyurethane adhesives, particularly in high-friction environments like sports facilities.

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Transparent water-based adhesive composition with high storage stability, fast drying, and good bonding properties for open-pored and absorbent substrates like paper, cardboard, wood, felt, cork, and textiles. The composition contains starch or starch derivatives, polyols or urea as humectants, polycarboxylic acids or salt of polycarboxylic acids or xanthan gum as thickeners, and water. The combination of these components provides a transparent adhesive with improved stability, drying speed, and adhesion compared to known water-based adhesives.

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Transparent water-based adhesive composition for bonding open-pored substrates like paper, cardboard, wood, fabric, and cork. The composition comprises starch, starch derivatives, a polyol/urea humectant, a polycarboxylic acid/thickener, and water. The composition exhibits improved storage stability, transparency, and drying properties compared to conventional starch-based adhesives. The humectant controls moisture levels, while the polycarboxylic acid/thickener maintains viscosity stability and prevents retrogradation. The composition is particularly suitable for applications where transparency and rapid bonding are critical.

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Water-based barrier adhesives for food packaging that achieve superior barrier performance and recyclability. The adhesives contain a polyurethane component and at least one water-soluble polymer, with the water-soluble polymer comprising hydroxyl groups. The adhesives exhibit high oxygen and water vapor transmission rates, enabling barrier films with >95% single-material recyclability. The adhesives can be formulated as aqueous solutions and applied as coatings, providing both adhesive and barrier properties.

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Solvent-free two-component polyurethane adhesive for high-temperature cooking applications, particularly for packaging materials. The adhesive combines a castor oil-based polyester polyol with a terminal isocyanate prepolymer, achieving superior performance in both bonding and thermal resistance. The polyol enhances film surface wettability and inhibits white spots, while the prepolymer enables rapid curing and improved peel strength. The resulting adhesive system provides reliable bonding and thermal resistance for packaging materials at temperatures up to 135°C.

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Yellowing-resistant solvent-free two-component polyurethane laminating adhesive for plastic film bonding that provides excellent peel strength and retort resistance. The adhesive uses aliphatic or cycloaliphatic isocyanates to avoid aromatic amines, and adjusts isocyanate and hydroxyl ratios to balance reaction speed and curing time. A small amount of silane coupling agent improves adhesion. The adhesive is prepared by reacting polyols, isocyanates, and a silane in specific ratios.

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Retort-resistant adhesive for food flexible packaging composite films that can withstand high temperature and high humidity environments. The adhesive is a two-component polyurethane system made by reacting polyester and polyether polyols with polyisocyanate and mixing with an adhesion promoter. The components are combined in a molar ratio of 1.75-1.9:1 NCO:OH. This provides superior retort resistance compared to conventional solvent-free polyurethane adhesives for food packaging.

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A high-performance, solvent-free polyurethane adhesive with improved bonding strength and environmental sustainability. The adhesive achieves enhanced bonding properties through the use of a novel polyurethane formulation that combines a polyglycol and poly adipic acid monomer system. This formulation enables faster open time, improved catalyst control, and enhanced chemical resistance compared to traditional solvent-based polyurethane adhesives. The adhesive is particularly valued for its environmental benefits and performance characteristics, making it suitable for applications requiring high bonding strength while minimizing environmental impact.

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Solvent-free polyurethane adhesive for composite films with enhanced barrier properties, particularly for applications requiring high barrier performance. The adhesive comprises a polyurethane prepolymer derived from a polymerization reaction, with an isocyanate and first polyol as reactive components. The prepolymer is formulated in a weight ratio of 100:10 to 100:80. The adhesive also includes a second polyol and nucleating agent, with a weight ratio of 90:100 to 100:90. The prepolymer coating is applied to one substrate, while the second polyol coating is applied to the other substrate. This dual-coating approach enables the creation of composite films with superior barrier properties without the need for aluminum foil or solvents.

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A solvent-free polyurethane adhesive with enhanced leveling properties that eliminates the traditional corrugation issues associated with solvent-based adhesives. The adhesive combines component A and component B in a two-component system, where component A is formulated to provide excellent leveling and bonding performance, while component B is optimized for improved flow characteristics and reduced surface tension. The combination enables a single-step application process with enhanced leveling properties, while maintaining superior bonding performance.

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Solvent-free polyurethane adhesive with low friction coefficient through the combination of polyethylene wax and silicone. The adhesive combines a polyester polyol component with polyethylene wax and silicone, where the silicone enhances the adhesive's surface smoothness while the polyethylene wax reduces friction. The polyurethane formulation enables high compounding speeds and flat, stable composite films.

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A food-grade water-based adhesive for sealing paper and plastic in food packaging applications. The adhesive contains specific polymer emulsion, plasticizer, defoamer, surfactant, and water ratios. The adhesive is prepared by adding the polymer emulsion, defoamer, and stirring before adding the plasticizer, surfactant, and water. The adhesive has improved adhesion to substrates like BOPP, PE, PET, PVC films due to the selected vinyl acetate-ethylene copolymer emulsion and acrylic emulsion. The adhesive is environmentally friendly and replaces solvent-based adhesives for food packaging applications.

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A two-component, solvent-free aluminum foil type 135C high-temperature cooking adhesive for packaging applications. The adhesive is a multifunctional, laminating compound that combines properties of both polyurethane and aluminum foils, enabling effective lamination of transparent films to aluminum foil while maintaining high temperature resistance.

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Polyester polyol for solvent-free adhesives that addresses common challenges in these applications. The polyol combines dicarboxylic acid or carboxylic anhydride, linear glycol, glycol with side groups, polyether polyol, and small molecule polyols. The optimized composition provides enhanced adhesion, improved heat resistance, and superior compatibility with polyethers and other materials.

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Solvent-free polyurethane adhesive for composite membrane applications that enables rapid bonding of multiple substrate layers. The adhesive, comprising a polymer substrate or aluminum-containing film, forms a strong bond between dissimilar substrates through a single curing step. The adhesive achieves superior bonding strength compared to conventional solvent-based adhesives, with bonding times as short as 2 hours. This enables the production of composite membranes with multiple layers, including aluminum-containing films, that can be formed using a single bonding step.

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Solvent-free polyurethane composite adhesive for bonding aluminum and plastic materials. The adhesive combines a polymer matrix with a synergistic combination of a phenolic resin and a polyurethane component, achieving improved peel strength and shear resistance compared to conventional adhesives.

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Laminate for flexible packaging with excellent adhesion and boil/retort suitability, and a packaging using it. The laminate has an ink receiving layer, adhesive layer, and base film. The ink receiving layer contains a water-dispersible resin. The ink receiving layer satisfies two requirements: a hydrogen bond surface energy term of 40 mN/m or less, and hardness of 350 N/mm² by nanoindentation. This provides good ink adhesion in high-temperature water environments like boil retort processing. The water-dispersible resin allows ink dispersion in water, preventing peeling. The adhesive layer bonds the ink receiving layer and base film.

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Solvent-free polyurethane adhesive composition for laminates, featuring improved conversion efficiency, bonding strength, chemical resistance, and heat resistance compared to traditional solvent-based adhesives. The composition comprises an amine-initiated polyol component and an isooxyester component, which can be applied independently to substrates before assembly. Upon mixing, the components react to form a strong adhesive bond between the substrates, exhibiting superior performance characteristics including faster curing times, improved chemical resistance, and enhanced thermal stability. The composition eliminates the need for catalysts and is specifically designed for food contact applications.

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