Catalyst Systems for Polymerization Control

Two-component curable adhesive for food packaging that has reduced levels of potentially harmful primary aromatic amines (PAAs) formed from isocyanate monomers. The adhesive composition contains a first component with a urethane prepolymer made from a specific isocyanate composition with high 4,4'-methylene bisphenyl isocyanate (MDI) content and low 2,2'-MDI and 2,4'-MDI contents. This composition when cured forms urethane links with higher biuret derivative content compared to traditional urethanes. The second component is a polyol for curing. The biuret derivatives in the prepolymer suppress PAAs formation. The biuret/urea ratio and MDI content balance are key to reducing PAAs while maintaining adhesive properties.

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Compositions for forming films with improved thermal stability for 3D packaging applications. The compositions contain resins, imidazole compounds with latent thermal activity, fillers, and additives. The imidazoles have low thermal activity initially but release more heat during curing. This improves film properties like Tg, modulus, and CTE at high temperatures. The compositions can be used in thermocompression bonding for 3D packages.

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A two-component curing adhesive composition for laminating substrates like films, papers, and labels. The adhesive composition has an oil or fat with anhydride groups as component A, and a curing agent containing an acid-modified polyol and an amine compound as components B and C. The amine compound improves cure speed by catalyzing the reaction between the anhydride and hydroxyl groups. This adhesive composition allows safer, recyclable, and biodegradable laminated products compared to traditional reactive adhesives. It also enables the collection, separation, and reuse of plastic waste from laminated products.

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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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Two-component curing adhesive for packaging materials that reduces the formation of harmful amines during lamination. The adhesive contains a polyisocyanate composition with a high percentage of 4,4'-diphenylmethane diisocyanate (MDI) and a low percentage of 2,2'- and 2,4'-MDI impurities. This MDI composition is reacted with a polyol composition to form a urethane prepolymer. The prepolymer contains biuret and urea derivatives of MDI. The biuret content is 0.4-20% by weight, which is higher than the urea content. This composition provides fast reduction of amine impurities like PAA during lamination compared to MDI adhesives with lower biuret levels.

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An adhesive composition for lamination applications that reduces the formation of air bubbles during curing. The adhesive composition contains a polyisocyanate component and a polyol component. The polyol component includes a polyol, like glycerin or pentaerythritol, and a compound selected from dimethylolpropionic acid and dimethylolbutanoic acid. This composition prevents bubble formation during curing of the adhesive by rapidly curing the polyisocyanate with the polyol and suppressing bubble growth.

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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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Biodegradable natural gum-based food packaging material that aims to replace synthetic plastics. The packaging material is made by polymerizing natural gums like guar gum, acrylamide, and acrylic acid with crosslinkers and plasticizers. The biodegradable film has properties like uniformity, biodegradability, transparency, and strength comparable to synthetic plastics. It can be used for food packaging and is recyclable/reusable. The film is developed by optimizing parameters like initiator concentration, curing temperature, drying temperature, and casting area.

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Two-component curable adhesive for packaging materials that reduces residual isocyanate in the cured adhesive. The adhesive contains a polyisocyanate composition with low molecular weight isocyanate monomer (140-280 Da) blended at 0.001-0.1% by mass based on solid content. This composition has isocyanate groups larger than 280 Da along with the lower molecular weight monomer. The adhesive also contains an amine compound. The low molecular weight isocyanate monomer reduces residual isocyanate in the cured adhesive while maintaining adhesion. The amine compound reacts with isocyanate to further reduce residual isocyanate.

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Two-component curing adhesive with reduced residual solvent for laminates and packaging applications. The adhesive contains a polyester polyol, isocyanate, solvent, and drying aid. The polyester polyol has aromatic carboxylic acid groups and an isocyanuric ring. The drying aid helps evaporate the solvent during cure. This adhesive formulation allows using polyester polyols with aromatic carboxylic acids that have better barrier properties, while minimizing solvent residue in the cured adhesive.

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Adhesive, laminate, method for producing laminate, and packaging material with improved appearance and strength. The adhesive uses a specific combination of isocyanate and polyol components. The isocyanate component contains a polyisocyanate compound. The polyol component contains a polyol and a compound selected from dimethylolpropionic acid and dimethylolbutanoic acid. This composition suppresses air bubble formation during curing, reducing defects like surface pitting and improving laminate strength. The adhesive is used to bond base materials for laminates like packaging materials.

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Sealing hollow cylindrical containers filled with silicone compositions, like RTV-1 sealants, to prevent hardening and contamination at the seal. The sealing process involves applying a silicone polymer with a viscosity of 5000 to 100,000 mPas at 25°C to the gap between the container inner wall and the plunger. This seals the gap and lubricates the plunger to prevent moisture penetration and hardening during long-term storage.

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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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Antibacterial photocurable topcoat for metal cans with improved adhesion and reduced environmental impact. The topcoat composition contains a cationic epoxy compound, a low molecular weight polyol, a cationic photoinitiator, a trifunctional radical monomer, a radical photoinitiator, a leveling agent, and a silver compound. It cures with low UV exposure to form a coating with antibacterial properties. The composition balances properties like adhesion, shrinkage, and light sensitivity for metal can applications. The low molecular weight polyol and cationic epoxy enable good adhesion after processing. The trifunctional radical monomer improves cure speed. The silver compound aids adhesion. The composition has reduced solvent content compared to radically polymerizable coatings.

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Light-curable topcoat for metal can packaging with improved adhesion and tackiness. The topcoat contains a cationically polymerizable compound, a polyether polyol, a cation photopolymerization initiator, a trifunctional radically polymerizable monomer, a radical photopolymerization initiator, and a polydimethylsiloxane-based leveling agent. This composition provides good adhesion to metal surfaces, process tackiness, and reduced curing time compared to traditional cationically polymerizable topcoats. The cationically polymerizable compound has an epoxy group, the polyether polyol has 2-3 hydroxy groups, and the trifunctional radically polymerizable monomer improves tackiness. The cationic and radical initiators allow crosslinking. The leveling agent reduces surface tension.

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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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Solvent-free flexible food packaging adhesive that allows rapid bond strength development and rapid PAA and NCO decay. The adhesive is made by mixing an isocyanate-reactive component containing an aminobenzoate-terminated composition with a polyol or polyamine. The aminobenzoate component provides rapid isocyanate reaction and decay compared to traditional polyol/polyamine components. This enables faster bond strength development in high-performance flexible packaging adhesives without solvents.

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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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Stabilizing an aqueous dispersion of biodegradable resin for use as a heat sealant in food packaging applications. The dispersion has improved stability over time with reduced gelation compared to previous formulations. The stabilization involves using specific carbodiimide compounds and mixed group dibasic acid esters to prevent hydrolysis of the biodegradable resin while avoiding excessive gelation. This allows the dispersion to have both hydrolysis resistance and good dispersion stability. The stabilized biodegradable resin dispersion can be applied directly to paper substrates to reduce plastic use in food packaging compared to traditional laminated films.

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A laminate and packaging bag for ink cartridges that prevent curing of ultraviolet (UV) curable inks during storage. The laminate has layers in order of protective, light blocking, and sealant. The light blocking layer has a roughened area on the sealant layer side. This roughness scatters incident light to reduce transmission into the sealed bag. This prevents UV light from curing the ink during storage. The roughness is 0.2-0.6 μm to avoid affecting adhesion.

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