Catalysts for Packaging Polymerization

Two-component curable adhesive for packaging materials that reduces the formation of toxic aromatic amines in food contact applications. The adhesive contains a specific composition of isocyanate prepolymer, biuret derivative, and urea derivative. The biuret and urea derivatives suppress crystallization and cloudiness in the prepolymer. They also promote faster reaction of the isocyanate groups with water to reduce amine formation. The biuret derivative content is 0.4-20% of the isocyanate composition, with a ratio 1:1 or higher biuret:urea.

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Laminate that is cured coating film of an adhesive, and a packaging material comprising a laminate. The laminate comprises a polyol composition and a polyisocyanate composition, and a phosphoric acid derivative.

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Polyester resin composition, adhesive, film, laminate, and packaging material that suppresses elution of low molecular weight components like dicarboxylic acids and diols during polymer formation. The composition contains a polyester resin, like an oxygen-absorbing unsaturated polyester, and a curing agent in specific amounts. Adding the curing agent in a range of 50 to 1000 parts per 100 parts of polyester resin prevents leaching of raw material components during polymerization. This improves oxygen absorption properties of the final product compared to the polyester alone. The composition can be used in films, adhesives, laminates, and packaging materials to provide oxygen barrier properties while reducing contamination of contents with low molecular weight residues.

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Reducing migration of styrene from polystyrene food packaging by incorporating halloysite clay into the packaging material. The halloysite clay, which is a type of aluminosilicate clay, is added to the polystyrene in a range of 0.1-50% by weight. The clay prevents migration of styrene monomers and oligomers by catalyzing the polymerization of styrene into stable oligomers.

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Resin composition for high-speed melt molding of packaging materials with reduced void formation at high temperatures. The composition contains EVOH as the main component produced using an azonitrile-based polymerization initiator. The EVOH has a specific ratio of nitrogen derived from the initiator to nitrogen from other sources. This ratio is 0.65 to 0.99. The composition can also contain metal ions and carboxylic acids. The controlled nitrogen ratio suppresses void formation during high-temp molding.

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A method to improve the adhesion and print quality in flexible packaging by reducing aging time and preventing ink layer deterioration. The method involves applying a thin layer containing a polyol and catalyst over the printed layer on the first substrate. This layer is then cured before applying the adhesive layer. The cured layer prevents low molecular weight components from the adhesive penetrating the ink layer during aging, preventing ink layer swelling and deterioration. The catalyst speeds up curing of the adhesive layer.

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Photocurable topcoat for metal packaging that provides excellent adhesion to the substrate and after processing, even when cured at low light levels. The topcoat composition contains a cationically polymerizable compound, a polyether polyol, a cationic photopolymerization initiator, a radical photopolymerization initiator, a trifunctional radical polymerizable monomer, and a polydimethylsiloxane-based leveling agent. The cationic compound, polyether polyol, and cationic initiator are present in specific ratios to enable good adhesion and low cure shrinkage. The radical initiator and monomer are used in smaller amounts. The topcoat is cured using light in the 320-390 nm range. This allows forming the topcoat with low energy UV curing while maintaining adhes

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Polystyrene-based food packaging with reduced styrene migration to prevent contamination of packaged food. The packaging material contains halloysite clay, a specific type of aluminosilicate clay, in a range of 0.1-50% by weight. The halloysite clay catalyzes the polymerization of styrene monomers and oligomers into larger chains that prevent migration into the food.

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Food packaging made of polystyrene with low styrene migration to prevent contamination of the food. The packaging contains a specific type of clay called halloysite, present in nanotube form, in an amount of 0.1-50% by weight relative to the packaging material. The halloysite catalyzes the formation of styrene oligomers from monomers, dimers, and trimers, preventing their migration into the food.

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Resin composition for packaging materials that reduces voids during high-speed melt molding. The composition contains an ethylene-vinyl alcohol copolymer (EVOH) made with an azonitrile-based polymerization initiator. The EVOH has specific nitrogen element ratios derived from the initiator. The amount of nitrogen elements derived from the initiator is 5-60 ppm, and the ratio of nitrogen elements in the dried resin to initiator nitrogen is 0.65-0.99. This composition suppresses void formation during high-temperature molding compared to EVOH made with other initiators.

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A method for producing flexible packaging films with improved adhesive properties and reduced defects like squeeze-out during lamination. The method involves separately applying the catalyst to one of the substrates in a dot pattern, instead of mixing it with the adhesive components. This allows contact bonding of the adhesive components on one substrate with the catalyst dots on the other substrate. This separate catalyst application suppresses squeeze-out, increases adhesive pot life, and accelerates curing compared to simultaneous catalyst addition.

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Method for producing flexible packaging films with improved production efficiency, squeeze-out prevention, and fast curing speeds. The method involves separately applying a catalyst to one substrate in a dot pattern, then laminating it with a reactive adhesive containing a polyisocyanate and polyol on the other substrate. This allows separate application of the catalyst to suppress squeeze-out during lamination, increase adhesive pot life, and provide faster curing compared to applying the catalyst with the adhesive components.

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Method for producing flexible packaging films with improved adhesion, pot life, and curing speed by separately applying the isocyanate and polyol components and a catalyst in a dot pattern. This prevents squeeze-out during lamination and allows stable application. The catalyst is applied separately to the substrate opposite the adhesive-coated one. This enables contact bonding with the adhesive components when brought together. It also increases pot life by allowing longer mixing times before catalysis starts. The catalyst dot pattern prevents excessive catalyst migration during adhesive mixing.

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Polyurethane composition and eco-friendly packaging material made from it, using a catalyst system with bismuth compounds to cure the polyurethane. The catalyst system contains bismuth (2-ethylhexanoate) and bismuth propionate in a molar ratio of 2 to 10. The bismuth content is 0.05-1% based on the polyol weight. This catalyst system provides good pot life, potency, and cured product properties compared to using just one bismuth compound. The composition also includes a urethane prepolymer with 3.5-6.5% isocyanate, polyol, filler, pigment, and heavy naphtha. The heavy naphtha prevents the catalyst from reacting with air/moisture to maintain catalyst activity. The eco-friendly packaging material

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A method for producing flexible packaging film that improves adhesive performance, reduces squeeze-out, and prolongs pot life compared to coating both adhesive components together. The method involves separately applying only the catalyst to the second substrate while coating the adhesive components onto the first substrate. This allows the adhesive to cure without squeezing out when the substrates are joined. It also allows longer pot life since the catalyst is applied separately and the adhesive components can be stored separately before application.

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A process to make high molecular weight poly(ethylene-2,5-furandicarboxylate) (PEF) polymers without discoloration for use in bottle, film, and fiber applications. The process involves a three-step synthesis: (1) making a prepolymer with a furandicarboxylate moiety by transesterification, (2) catalyzed polycondensation of the prepolymer under reduced pressure, and (3) solid-state polymerization to crystallize the polymer. Using specific catalysts and conditions in each step allows reaching high molecular weight PEF without discoloration. This enables making clear PEF bottles, films, and fibers by conventional processing methods.

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Producing plastic bottles with improved crystallization rate and clarity by adding a compound called 1,2-benzisothiazole-3 (2H) -one dioxide to the polyester resin during bottle production. The compound, when added in a small amount (0.005-0.025 parts per 100 parts resin) as a masterbatch, improves the crystallization rate of the polyester resin without compromising clarity. This allows faster molding cycles for plastic bottles made from polyester resins like PET.

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Method for manufacturing flexible packaging films with improved efficiency, productivity, and curing speed by separately applying a catalyst. The method involves coating a mixed liquid of polyisocyanate and polyol on one substrate, and applying a catalyst point on the other substrate. This allows pressure bonding the coated substrates without extrusion issues. It enables faster production of adhesive films for flexible packaging by avoiding the need for precise coating ratios. The separate catalyst application prevents extrusion during bonding and allows stable production of adhesive films with lower coating amounts.

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Manufacturing method for soft package films that improves adhesion and processing efficiency. The method involves applying the polyisocyanate component of the adhesive to one substrate, then applying the polyol component to the other substrate. Instead of laminating the substrates with the mixed adhesive, a dot-shaped catalyst is applied to the second substrate. This catalyst initiates the polyurethane reaction between the separate adhesive layers when the substrates are laminated, providing better adhesion and processing stability compared to applying the mixed adhesive.

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Producing flexible packaging film with improved adhesive properties and reduced edge squeeze-out by separately applying the catalyst instead of mixing it with the adhesive components. The adhesive is a two-component reactive polyurethane made by mixing a polyisocyanate and a polyol. The catalyst is applied as dots on the second substrate before lamination. This allows separate coating of the adhesive components on the first substrate and the catalyst on the second substrate, preventing squeeze-out during lamination. It also prolongs pot life for better production efficiency.

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