Strength-Enhancing Additives for Packaging

A polyisocyanate composition for two-component curing applications like adhesives and coatings. The composition contains a specific type of polyisocyanate made by reacting xylene diisocyanate and a diol with a molecular weight of 65-300. This polyisocyanate has lower diisocyanate monomer content compared to conventional polyisocyanates. It provides improved safety and reduced migration concerns in applications like food packaging adhesives. The lower diisocyanate monomer content reduces the risk of unreacted diisocyanate remaining in the final product.

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Biodegradable and compostable polymer compositions for flexible food packaging films that have low water vapor permeability. The compositions contain a mixture of biodegradable polyesters, including rigid polyesters like PBS, PLA, and PHA, as well as flexible polyesters like PBAT and PCL. The compositions also have small amounts of hydrophobic additives like behenamide. The blends have desirable mechanical properties like high modulus, strength, and elongation for packaging applications.

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Laminated films for packaging materials that have excellent retort resistance at high temperatures and impact resistance at high temperatures for applications like retort sterilization. The films have a layered structure with a surface layer, an intermediate layer, and a heat-sealable layer. The surface layer contains a copolymer of ethylene and a monomer like ethyl acrylate or methyl acrylate. The intermediate layer contains a copolymer of ethylene and a monomer like ethyl acrylate, methyl acrylate, or maleic anhydride. The copolymers in the layers have specific compositions and Mw/Mn ratios for balanced retort resistance and impact strength. The layered film structure provides both good retort resistance at high temperatures and impact resistance at high temperatures.

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Natural fiber-based transparent composites for food packaging that provide a sustainable alternative to fossil fuel-based packaging materials. The composites are made by UV polymerization of alkene and thiol-based monomers with natural fibers like jute. The UV radiation initiates crosslinking reactions to form a tightly bonded matrix around the fibers, resulting in high transparency (>90%) for packaging applications where visibility of contents is essential. The composites offer benefits of natural fiber composites with improved mechanical properties compared to neat polymer films.

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Functional reinforcing paper with insect repellent, antibacterial, deodorizing, moisture proofing, and freshness maintaining properties for improved packaging quality. The paper has a coating with a functional material like insect repellent, antibacterial agent, deodorant, freshness retainer, or desiccant. It can also be used as a packaging material itself with contact surfaces containing the functional material. The coating enhances strength, water resistance, and oil resistance.

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Thermally insulated, waterproof, and high-strength packaging bag that provides improved protection for goods while reducing wrinkling and damage. The bag uses a composite structure with outer and inner paper layers sandwiched between insulating foam layers. Elastic adhesive is used to bond the layers. The outer layer has a convex buffer structure that disperses pressure. The insulating foam has a gradient height convex structure to prevent wrinkling. The adhesive is a polyurethane emulsion with thickener, wetting agent, and silane coupling agent for strength and elasticity.

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Biodegradable nanocomposite food packaging films that provide enhanced antimicrobial and oxidation inhibition properties to prevent spoilage and pathogen growth. The films are made by incorporating biosynthesized zirconium nanoparticles capped with a bioactive compound called Arachisan derived from peanut leaves. The ArZrNPs provide antimicrobial activity against food-borne pathogens like Salmonella and E. coli. They also scavenge free radicals to prevent oxidation. The nanoparticles are dispersed in biodegradable polymer films for sustainable packaging with extended shelf-life and reduced pathogen risk.

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Hybrid biocomposite film for food packaging that combines whey protein isolate, chitosan, and silica to improve properties like strength and antibacterial activity. The film consists of a whey protein isolate matrix with added chitosan and silica fillers. The chitosan provides antimicrobial properties while the silica increases strength. The composite films have higher tensile strength and elongation compared to the whey protein isolate film. The chitosan concentration of 1.5% and silica concentration of 5% provide optimal antibacterial properties against E. coli.

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High-strength packaging bag with improved heat insulation, water resistance, and compression resistance compared to conventional bags. The bag has a composite structure with outer and inner layers sandwiched between insulating layers. The outer and inner layers provide strength and compressive resistance, while the insulating layers prevent air flow and moisture. Adhesive layers connect the layers. The adhesive is a polyurethane emulsion with tackifiers, impregnating agents, and silane coupling agents for stability and dispersion.

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Preparing a grass-derived multifunctional nanomaterial film for food packaging that enhances mechanical properties, water resistance, UV protection, oxygen scavenging, and antimicrobial properties. The film is made by incorporating nanomaterials extracted from dried darbha grass, like carbon dots, cellulose nanofibers, and silver nanoparticles, into PVA films. The grass nanomaterials improve the film's performance compared to standard PVA films.

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Bioplastics made from agricultural waste like mango seeds, filled with chitosan or nanochitosan, for use as sustainable food packaging. The bioplastics have improved properties like reduced water vapor transmission, better mechanical strength, and antimicrobial activity compared to the pure mango seed bioplastic. The chitosan and nanochitosan fillers also reduced water uptake. The recommended bioplastics for food packaging are 20% CS-30% Sor-10% CA and 30% NCS-20% Sor-10% CA.

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A food-grade barrier coating for molded pulp products like bowls, trays, and containers that provides water and grease resistance. The coating is made by crosslinking shellac resin applied to the pulp. The crosslinking involves thermal aging in an oven to melt and fuse the shellac chains. This creates a durable, water-repellent coating that penetrates the pulp fibers. The coated pulp products have low cobb (water absorption) and kit (grease penetration) values, making them suitable for food packaging. The crosslinked shellac barrier meets food migration limits at elevated temperatures.

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A sustainable and biodegradable packaging material made from coating chitosan on dry banana leaves. The method involves spreading a chitosan-glycerol solution onto a banana leaf, letting it dry, and repeating on the other side. This creates a flexible, smooth, and biodegradable packaging material that can be used for food items. The chitosan coating provides strength and moisture barrier properties, while also degrading completely in soil within 15 days.

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Biodegradable starch-based polymer composition with ionic liquid plasticizers for sustainable packaging. The composition involves blending native starch, biodegradable polyester, and an ionic liquid plasticizer to create a thermoplastic starch film that is stable under varying humidity conditions and has improved mechanical properties compared to traditional starch blends. The ionic liquid plasticizer prevents retrogradation and maintains stability even after storage. The composition offers an eco-friendly alternative to synthetic plastics for packaging applications.

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Biodegradable food packaging films made from gelatin with added copper and zinc oxide nanoparticles that have enhanced physical stability and antimicrobial properties compared to plain gelatin films. The nanoparticles crosslink with the gelatin to improve moisture resistance, strength, and durability for food packaging applications. The copper and zinc ions released from the nanoparticles also have antibacterial effects to prevent microbial contamination on food surfaces.

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Biodegradable food packaging material made from natural components like plant extracts, graphene oxide, and calcium carbonate. The packaging has layers of paper, adhesive, and a coating. The base layer is made from a copolymer resin, polyethyleneimine, calcium carbonate, tourmaline powder, and plant extract. The adhesive layer contains PLA, lactic acid oligomer, PBAT, tetraethylene glycol diacrylate, sisal fiber, mineral oil, and plant oil. The coating layer is made from polyurethane acrylate resin, PLA, graphene oxide, plant extract, and plant oil. The packaging provides improved biodegradability, reduced oxygen permeability, and antibacterial function compared to conventional plastic packaging.

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Biodegradable food packaging materials made from biopolymers like PLA, nanobacterial cellulose (NBC), and PEG400. The materials can be used for packaging fruits, vegetables, shoots, seeds, etc. The NBC is produced from a specific strain of Bacillus licheniformis. The PLA-NBC composite materials have improved mechanical properties like tensile strength compared to PLA alone. The NBC provides stiffness and PEG400 adds elasticity. The materials are also antimicrobial. The NBC can be coated onto paper or formed into membranes. The PLA-neem extract coating is another biodegradable option.

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Biodegradable food packaging materials made from biodegradable nanocomposites based on polylactic acid (PLA) combined with nano bacterial cellulose (NBC) and optionally polyethylene glycol 400 (PEG400). The nanocomposites can be applied as coatings on secondary surfaces like paper or formed into membranes. The nanocomposites provide improved mechanical strength and barrier properties compared to PLA alone, making them suitable for food packaging. The nanocomposites can also be antibacterial due to the NBC content. The PLA-NBC composites can be prepared by mixing the components with stirring and spreading to dry.

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Active biodegradable plastic packaging film made from pear waste that has improved mechanical properties, UV barrier, oil barrier, and biodegradability compared to conventional plastics. The film is made by combining mashed pear peel and pulp extract, starch solution, and glycerol. The pear waste acts as a filler to enhance properties, starch as a crosslinking agent, and glycerol as a plasticizer. The film is cast and cured to create a biodegradable packaging material with functional properties like antioxidant activity and moisture control. The film can be used in food packaging, pharmaceuticals, and other applications requiring sustainable and active packaging solutions.

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Method of making biodegradable packaging material from rice straw waste using delignification and phosphorylation to create sustainable, biodegradable, and thermally stable packaging. The process involves delignifying rice straw to remove lignin, then phosphorylating it to improve properties like strength and water resistance. The phosphorylated rice straw is dispersed in water, sonicated, cast, and dried to make films, cups, aerogels, and drinking straws for food packaging. The biodegradable packaging replaces single-use plastics and reduces waste.

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