Innovations in Water Based Solvent Free Adhesives

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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A water-based adhesive for bonding cellulose substrates that enables rapid bonding and maintains strength after application. The adhesive composition comprises a chloroprene-modified acrylic emulsion, a water-soluble polymer, and a thickening agent, achieving a viscosity range of 200-4000 mPa.s. This composition enables immediate gel formation during application, followed by rapid bonding, while maintaining a strong bond over accelerated storage conditions. The adhesive is specifically optimized for applications requiring high strength adhesion to cellulose substrates, particularly those with UV-coated surfaces.

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Solventless polyurethane adhesive for flexible packaging that achieves rapid curing and excellent adhesion properties. The adhesive comprises a terminal isocyanate prepolymer, a hydroxyl compound, and a polyol. The prepolymer and polyol components form a cross-linked network while the hydroxyl compound acts as a catalyst. The adhesive exhibits fast curing, reduced processing time, improved mechanical properties, and enhanced environmental sustainability compared to traditional solvent-based adhesives.

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Solvent-free polyurethane adhesive for flexible packaging that enables rapid production and meets stringent environmental and safety requirements. The adhesive combines a high-performance, isooxy acid-based monomer with a polyol-based cross-linking agent, achieving excellent bonding properties while eliminating solvent residues. The adhesive formulation allows for simultaneous coating of both substrates, enabling a single-step bonding process that eliminates the need for intermediate drying steps. This innovative approach enables faster production cycles, improved quality control, and reduced environmental impact compared to traditional solvent-based adhesives.

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A solvent-free adhesive for flexible packaging that maintains its performance during high-temperature cooking conditions. The adhesive composition comprises a diol-polyol mixture, diisocyanate, and a polymer C prepolymer, which is prepared through a controlled polymerization process. The prepolymer C is an isocyanate-terminated prepolymer obtained by polymerizing a polyoxypropylene diol and isophorone diisocyanate. The diol-polyol mixture and diisocyanate compound are combined under controlled conditions to form a component A, which is then heated to form a polymer C prepolymer. This polymer C prepolymer is then polymerized to form a solvent-free adhesive. The adhesive maintains its peel strength and resistance to cooking conditions, making it suitable for packaging applications where high-temperature processing is required.

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Solvent-free two-component adhesive system for bonding various materials, including aluminum, plastic, and composite structures. The system comprises two components, A and B, which are mixed in a uniform ratio and then laminated and cured under heat. The A component is a polyurethane-based resin with a molecular weight of 200,000-500,000, while the B component is a polyurethane-based resin with a molecular weight of 50,000-150,000. The system exhibits excellent bonding strength and flexibility, with a maximum processing speed of 400 m/min. The components can be stored separately and mixed just before use, enabling efficient and safe application in composite packaging and other industrial applications.

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A 100% solid, solvent-free, and environmentally friendly adhesive for food packaging that achieves high temperature resistance without additives. The adhesive is prepared through self-crosslinking and graft modification of a polyurethane polymer, eliminating the need for solvents and conventional additives. This innovative adhesive system enables reliable bonding in high-temperature applications while maintaining food safety and quality.

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Solvent-free, water-resistant polyurethane adhesive for packaging applications that can withstand boiling and high humidity environments. The adhesive consists of two components. Component A is an isocyanate-terminated polyurethane made from a low molecular weight polyether polyol and polyisocyanate. Component B contains castor oil, castor oil derivatives, and castor oil polyurethanes along with a low molecular weight polyether polyol. This combination provides a solvent-free adhesive with high boiling and water resistance.

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A solventless two-component polyurethane cooking gum that enhances peel strength and resistance to media through a bisphenol A structure. The gum comprises a bisphenol A-based polyether and a polyester polyol, synthesized through a process that maintains high temperature resistance while achieving improved peel strength and adhesion properties. The bisphenol A structure introduces enhanced thermal stability and chemical resistance, while the polyester polyol provides superior mechanical properties. The gum's unique composition enables effective peel strength retention and resistance to media degradation during cooking, making it suitable for applications requiring high-temperature performance and chemical resistance.

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A low friction coefficient solventless polyurethane adhesive for composite flexible packaging applications, particularly for food, daily necessities, and pharmaceuticals. The adhesive composition comprises a component A and a component B with a functional group molar ratio of Group B to NC0: -0H = (1.1 to 1.8): 1. The adhesive formulation combines a polyurethane polymer with a functional group-containing component to achieve a low coefficient of friction. The formulation enables improved performance in composite flexible packaging applications where conventional adhesives typically exhibit high friction, particularly in thin PE film layers.

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A low-VOC, environmentally friendly polyurethane adhesive for construction and decoration applications. The adhesive combines a polyether polyol and polyester polyol with additives to create a spray-on adhesive with improved performance and safety characteristics. The formulation features a unique blend of foam stabilizers, anti-foaming agents, and catalysts that enhance sprayability and curing properties while minimizing VOC emissions. The adhesive's permanent tack and wide curing range make it suitable for various applications, including furniture, cabinetry, and decorative coatings.

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Starch-based aqueous adhesive compositions and uses thereof. The compositions comprise a starch-derived adhesive that exhibits shear-thinning rheological behavior, enabling improved wet tack and reduced splashing during laminating processes. The adhesive composition comprises a starch-derived adhesive that contains a carboxymethylated polysaccharide, particularly a highly branched starch, and a non-food-grade additive. The composition is particularly effective for laminating paper products, cardboard products, and displays made from paper or cardboard, and exhibits superior wet tack compared to conventional starch-based adhesives.

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Aqueous adhesive for flexible packaging that replaces traditional solvent-based adhesives with a water-based formulation. The adhesive comprises a mixture of water, a biodegradable polymer resin, and additives, which provides strong bonding properties while eliminating the need for solvents and their associated environmental and health risks. The adhesive can be formulated into a laminating film suitable for packaging applications.

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A solvent-free polyurethane adhesive for flexible packaging that combines high tack performance with low viscosity. The adhesive comprises a terminal isocyanate component and polyol components with a NCO:OH molar ratio of 1.1-1.5. This composition enables a thin film application while maintaining sufficient tack for bonding, while the low viscosity ensures improved machine operation and reduced environmental impact compared to traditional solvent-based adhesives.

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Solvent-free two-component polyurethane adhesive composite film and preparation method for flexible packaging. The adhesive combines isocyanate and hydroxyl-terminated polyol components in a 1.2-2.0 molar ratio, with the polyol components comprising polyether, polyester, or castor oil. This formulation enables a solvent-free laminating process while maintaining superior adhesion properties.

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Adhesive composition and stick for paper and cardboard bonding that achieves superior performance while maintaining natural ingredients. The adhesive composition comprises water, starch, glycerol, and fatty acids with a combined concentration of at least 98% of these components. This formulation provides excellent bonding properties without the need for plasticizers or other additives commonly used in traditional adhesives. The composition's natural composition makes it biodegradable and non-toxic, while its enhanced bonding performance enables stronger, more reliable bonding in various applications.

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Water-based adhesives and coatings that exhibit enhanced adhesion properties on low-energy surfaces. The compositions comprise a first polymer component with a number average molecular weight greater than 50,000 Daltons and a second polymer with a number average molecular weight less than 20,000 Daltons. The adhesion composition, preferably an adhesion emulsion, provides improved cohesion and resistance to shear on low-energy substrates, particularly for packaging, leather, and textiles applications.

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A bi-component solvent-free polyurethane thin film adhesive for food packaging applications. The adhesive comprises a polyester polyol component with propylene oxide and polyether glycol, and a secondary butanediol component with coupling agent. The adhesive formulation includes a wetting agent and a water solution stabilizer. The formulation achieves superior heat resistance and low-temperature performance while maintaining excellent adhesion properties.

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