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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Coating composition for metal packaging materials like beverage cans that doesn't generate formaldehyde during curing. The composition contains a polymer with hydroxyl groups, a triazine derivative called 1,3,5-triazine-2,4,6-triscarbamic acid ester, a quaternary salt, and solvents including alcohols. The alcohol solvents help stabilize the composition by preventing the triazine derivative from reacting with the polymer and increasing viscosity over time. The triazine derivative provides excellent curing without formaldehyde release. The quaternary salt improves curability. The composition is suitable for coating metal packaging materials like cans to provide a durable, low-formaldehyde outer coating.

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Reducing migration of mineral oils from paper food packaging into food by adding a copper-containing oxidase enzyme to the paper pulp during manufacturing. The enzyme catalyzes polymerization of lignin in the pulp, fixing and trapping the mineral oils in the paper instead of allowing them to migrate into the packaged food. This prevents or significantly reduces the levels of mineral oil compounds like MOSH and MOAH that can contaminate food from recycled paper packaging.

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Method for producing flexible packaging films with improved adhesion and appearance by separately applying the adhesive components instead of mixing them. The method involves applying the polyisocyanate (A agent) and polyol (B agent) separately onto two substrates, then bringing them together with a catalyst applied to one substrate. This allows the adhesive components to react and cure separately before being brought into contact. This prevents short pot life issues from the highly reactive isocyanate component in the adhesive. The separate application also allows better control over the adhesive properties by optimizing the coating weights of the A and B agents.

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Resin composition for packaging materials like films and laminates with improved properties like appearance, gas barrier, and adhesion. The composition contains specific amounts of inorganic particles and unsaturated aldehydes. The inorganic particles improve slip and blocking resistance. The unsaturated aldehydes suppress gelation during melt processing. By controlling the particle-aldehyde ratio, film properties like roughness, length, and breakage are optimized. The composition also has fewer vapor deposition defects and better adhesion between layers.

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Resin composition, multilayer structures, containers, and packaging made with the resin composition that provides improved retort resistance, kogation suppression, and odor control during long-term processing. The composition contains ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA), carboxylic acid metal salt, and saturated aldehyde. The EVOH has 20-60 mol% ethylene, PA is a polyamide, the metal salt contains 1-500 ppm metal, and the aldehyde has 3-8 carbon atoms. The composition ratios and additions suppress gelation, kogation, and odor during processing, while maintaining retort resistance.

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Resin composition for multilayer structures used in containers and packaging materials that provides improved retort resistance, prevents burnt deposits during extrusion, and inhibits coloring. The composition contains EVOH, PA, carboxylic acid salt, and a saturated aldehyde or ketone. The EVOH:PA mass ratio is 60:40 to 95:5, the carboxylic salt concentration is 1-500 ppm, and the saturated aldehyde/ketone concentration is 0.01-100 ppm. The composition prevents crosslinking between EVOH and PA during processing, reduces burnt deposits, and inhibits coloring compared to conventional EVOH:PA compositions.

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Method for producing flexible packaging films with improved adhesive properties by separately coating catalyst instead of mixing it in the adhesive. The method involves applying a polyisocyanate component (agent A) to one side of the packaging film, and separately coating a polyol component (agent B) and catalyst on the other side. This allows longer pot life of the adhesive compared to mixing the catalyst in, and faster curing rates. The separated application also reduces the risk of catalyst degradation during storage. The catalyst promotes the urethane reaction between the isocyanate and polyol components when the films are joined.

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Radiation curable liquids for inkjet printing on food packaging materials that reduce migration and set-off of monomers. The liquids contain specific compounds to prevent monomer extraction and migration into the packaging. These compounds are diffusion hindered acetalysation catalysts, hydroxyl containing compounds, and optionally photoinitiators. The liquids are applied as primers before printing and as overprint varnishes to seal inks. The primers prevent monomer penetration into the packaging, and the varnishes prevent set-off.

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Radiation curable liquids and inkjet inks for printing on food packaging materials that minimize migration and set-off of extractables. The liquids contain free radical polymerizable monomers, diffusion hindered acetalysation catalysts, and diffusion hindered hydroxyl compounds. The catalysts and hydroxyl compounds prevent monomer migration into the packaging material. The inks contain no initiators, but curable monomers. The liquids are applied as primers before inkjet printing. This reduces extractables and set-off on the back side when printed on olefin films. The liquids can also be used as overprint varnishes.

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Reducing migration of mineral oils from paper food packaging into food by fixing the mineral oils in the packaging material. The method involves adding a copper-containing oxidase enzyme like laccase to the paper pulp during production. The enzyme catalyzes polymerization of the lignin in the pulp, trapping the mineral oils and preventing their migration into the packaged food. This allows using recycled paper with residual mineral oils in the packaging, while minimizing contamination of the food. The enzyme treatment can be combined with lignosulphonate addition to further fix the mineral oils.

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A process for producing plastic bottles with improved crystallization and molding speed using a masterbatch containing a small amount of the compound 1,2-benzisothiazol-3 (2H) -one 1,1-dioxide. The compound is mixed with the polyester resin at levels of 0.005 to 0.025 parts by mass per 100 parts resin. This improves crystallization and reduces molding cycle time without affecting transparency or yellowing. The compound is added as a crystal nucleating agent to the polyester resin by preparing a masterbatch.

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Preparing high molecular weight polymers with furandicarboxylate groups for use in bottles, fibers, and films without discoloration. The process involves a three-step synthesis where a prepolymer with furandicarboxylate units is made first, followed by melt polymerization under reduced pressure. The key is using specific catalysts and conditions in the second step to avoid discoloration during polycondensation. The resulting polymers have high molecular weights (>25,000) without impurities, enabling applications like clear bottles.

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Reducing migration of mineral oils from paper food packaging into food by fixing the mineral oils in the packaging. The method involves adding a copper-containing oxidase enzyme to the paper pulp during production. The enzyme catalyzes polymerization of lignin in the pulp, which fixes and traps the mineral oils in the paper. This prevents the oils from migrating into the packaged food.

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Reducing migration of inkjet ink monomers into food packaging materials by using a primer and overprint varnish containing specific hindered compounds. The primer prevents monomer migration into the substrate and the varnish prevents set-off. The primer contains hindered acetalysation catalysts and hydroxyl compounds. The varnish contains hindered photoinitiators. This allows using lower viscosity inkjet inks with high monomer content that would otherwise penetrate the packaging material.

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Radiation curable inkjet inks for food packaging that reduce extractables and migration into packaging materials. The ink composition contains specific ingredients like hindered catalysts, co-initiators, and hydroxyl compounds to hinder monomer extraction and migration. The ink also has reduced water content to prevent swelling of the packaging material. The hindered catalysts and co-initiators slow down polymerization and reduce unreacted monomers. The hindered hydroxyl compounds complex with the catalysts to further hinder extraction. The ink composition can be used with a primer or overprint varnish containing similar hindered compounds to further reduce extractables and migration.

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Resin composition, multilayer structures, containers, and packaging materials with improved retort resistance and reduced burnt deposits during long-term melt processing. The composition contains ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA), a carboxylic acid salt, and an unsaturated aldehyde. The unsaturated aldehyde inhibits EVOH-PA interactions during melt processing to prevent gelation and burnt deposits. The carboxylic acid salt further suppresses EVOH-PA reactions. The composition, multilayer structures, containers, and packaging materials provide superior retort resistance and reduced burnt deposits compared to EVOH-PA compositions without these additives.

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Method to produce transparent plastic bottles with improved crystallization and molding properties by using a specific compound called 1,2-benzisothiazol-3(2H)-one 1,1-dioxide (BIT). The compound is added in a masterbatch formulation containing 0.005-0.025 parts BIT per 100 parts polyester resin. This masterbatch is then mixed with the polyester resin and molded into the bottle shape. The BIT nucleates crystallization of the polyester, improving molding cycle time and reducing whitening compared to direct addition of BIT powder.

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Reducing migration of mineral oils from paper food packaging into food by fixing the oils in the packaging. The method involves adding a copper-containing oxidase enzyme like laccase to the paper pulp during production. The enzyme catalyzes polymerization of lignin in the pulp. This fixes the mineral oils in the paper during formation and prevents migration into packaged food. The enzyme-treated pulp forms paper packaging with lower mineral oil migration compared to untreated pulp. The fixed oils can reduce migration below regulatory limits like 0.6 mg/kg MOSH and 0.15 mg/kg MOAH.

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Reducing migration of inkjet inks for food packaging applications by using radiation curable liquids with specific components. The radiation curable liquid contains acetalysis catalysts, hydroxyl compounds, and optionally co-initiators that hinder diffusion and polymerization. This reduces ink migration into packaging materials compared to conventional radiation curable liquids. The inkjet inks themselves can contain lower amounts of migration-prone components like monomers. The radiation curable liquids and inks are used in printing on food packaging materials like polyolefins to minimize extractables that could pose health risks.

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Reducing migration of mineral oils from paper food packaging into food by fixing the oils in the paper. The fixation is achieved by adding a copper-containing oxidase enzyme like laccase to the paper pulp during production. The enzyme catalyzes polymerization of lignin in the pulp, trapping the mineral oils and reducing their migration into the packaged food.

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Method to produce clear plastic bottles with improved crystallization and reduced molding cycle time. The method involves adding a small amount of a compound called 1,2-benzisothiazol-3(2H)-one 1,1-dioxide (BIT) to the polyester resin used for the bottles. BIT is blended with the resin in a masterbatch. This masterbatch is then mixed with the main resin and molded into the bottle shape. The BIT compound enhances crystallization of the polyester, allowing faster molding cycle times and preventing issues like whitening or turbidity. The optimal BIT concentration is 0.005-0.025 parts by mass per 100 parts resin.

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Producing plastic bottles with improved crystallization and reduced whitening by adding small amounts of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide (BIT) compound to the polyester resin used in bottle production. The BIT compound is blended with the resin via a masterbatch or directly during polyester resin production. The BIT compound improves crystallization and reduces whitening when blended with the polyester resin for bottle production. The optimal BIT concentration is 0.005-0.025 parts by weight per 100 parts of polyester resin.

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A method to improve crystallization speed of polyester resins like polyethylene terephthalate (PET) used in plastic bottles. The method involves adding small amounts of a specific compound called 1,2-Benzisothiazole 3(2H)-one (BIT) and its derivatives during the polymerization process. The BIT compounds act as nucleating agents to accelerate crystallization of the polyester resin without affecting transparency. The optimal concentration range is 0.005-0.025 mass percent BIT added to 100 mass percent polyester resin.

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