Techniques to Increase Barrier Properties of Biopolymers

A sustainable composite material for food packaging that combines the benefits of biodegradable polymers with the barrier properties of traditional packaging materials. The material comprises a biodegradable polymer matrix with a novel oxygen and moisture barrier coating that enhances the material's gas barrier properties while maintaining its biodegradable properties. The coating is prepared through a multi-step process that involves surface treatment of a biodegradable polymer film, followed by application of a high-barrier coating. The biodegradable polymer matrix is then coated with the barrier layer to create a composite material that provides superior barrier properties while maintaining its biodegradability.

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Multi-layer packaging material for eco-sustainable and high-barrier food packaging, particularly for confectionery products. The packaging has a biodegradable base film made of bio-based polymers like PBS, PHA, or vegetable proteins. It also contains natural fillers like cellulose nanofibers and phyllosilicates. The fillers improve barrier properties and mechanical strength. The packaging has a heat-sealable barrier layer on the inside made of biodegradable polymers like PHBH and PBS. This provides excellent oxygen, water vapor, and aroma barrier while still allowing compostability and biodegradation. The multi-layer structure combines biodegradability, compostability, barrier properties, and mechanical strength for eco-friendly confectionery packaging.

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Multi-layer packaging material with enhanced barrier properties and biodegradability for confectionary products. The material comprises a substrate made from biodegradable polymers, such as polyhydroxyalkanoates (PHA), and a barrier layer applied on both sides of the substrate. The barrier layer incorporates natural additives like proteins, phyllosilicates, and nanocellulose to achieve low oxygen transmission rates, low volatile aroma transmission rates, and low light transmission rates while maintaining mechanical properties suitable for high-speed packaging applications.

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Multilayer packaging structure for food applications that is biodegradable and compostable. The multilayer has an inner layer made of water-soluble polymer with oxygen barrier, an intermediate layer with wax for moisture barrier, and an outer layer of water-soluble polymer. The wax layer prevents odor transfer and migration. The multilayer is suitable for food packaging and can be composted after use. The water-soluble inner and outer layers seal the paper base. Crosslinked PVOH/PCL in the outer layer improves oxygen barrier.

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Bio-sourced film materials for packaging applications that provide good barrier properties to oxygen and water vapor. The film materials are made by blending bio-based polyesters and bio-based polyesters or polysaccharides. The bio-based polyesters are produced from renewable sources like bacterial fermentation. The bio-based polyesters are mixed with a bio-based polyether like polyethylene glycol. The resulting blended solution is spread onto a surface to form the film. This blending approach provides improved barrier properties compared to using just the bio-based polyesters alone.

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A food packaging film that combines hydrophobic properties with antibacterial properties through electrospinning. The film is prepared by combining PET with biowax, nano-SiO2, and superhydrophobic powder, which creates a membrane with high hydrophobicity and enhanced antimicrobial properties. The film's unique structure, comprising nano-SiO2 and micron-scale wax particles, provides a self-cleaning surface that prevents bacterial adhesion while maintaining food integrity. The film's performance is demonstrated through electrospinning and characterization techniques.

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High sealing food packaging film with enhanced barrier properties and antibacterial durability. The film uses a barrier coating made with nanocellulose, polyvinyl alcohol, and an antibacterial agent. The barrier coating is applied to a base film made from biodegradable polymers like PBAT, PHBV, and PGA. The nanocellulose aerogel in the barrier coating slowly releases antibacterial essential oils into the packaged food, providing long-lasting antimicrobial protection. The nanocellulose also improves the water vapor barrier of the film.

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Degradable high-barrier composite film for packaging applications that provides good barrier properties while being fully biodegradable. The film has a layer structure with inner layers made of modified biodegradable polymers and outer layers of materials like paper or cellulose film. The inner layers contain a modified polybutylene terephthalate-adipate copolymer, thermoplastic starch, compatibilizer, tackifier, and auxiliary materials. The outer layers can be made of renewable materials like paper or cellulose film. The inner biodegradable layers provide barrier properties while the outer renewable layers provide strength and printability.

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A recyclable laminate for container covers that replaces aluminum and extruded plastics. The laminate comprises a paper carrier coated with a barrier layer and a sealing wax layer, where the barrier layer has a solids content of 20-45% and the sealing wax layer has a solids content of 10-30%. The laminate is produced using conventional coating methods. The barrier layer prevents moisture and oxygen penetration, while the sealing wax layer provides a water-resistant seal. The paper carrier is made from a conventional paper material, eliminating the need for aluminum or extruded plastics. The laminate maintains product freshness while enabling recyclability.

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Food-grade multilayer film for flexible containers that combines barrier properties with mechanical strength for semi-liquid products. The film comprises a cellulose-based barrier layer with enhanced moisture barrier performance, followed by a PBSA-based middle layer. This multilayer structure maintains product integrity during handling and transportation while achieving the desired level of oxygen and water vapor transmission. The film is biodegradable and compostable, suitable for applications requiring both mechanical stability and environmental sustainability.

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Process for producing biobased packaging materials with enhanced barrier properties that can be recycled and biodegradable. The process involves forming a barrier layer on a paperboard substrate by extrusion coating a biobased polymer, such as a water-soluble copolymer, onto the substrate. The barrier layer is formed by extrusion of the biobased polymer through a die, with the polymer concentration optimized for barrier performance. This biobased barrier layer can be applied as a single-step process without additional polymer lamination or aluminum coating, enabling high-yield production while maintaining barrier performance.

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Preparing starch-based materials with improved strength and water resistance for applications like biodegradable packaging. The method involves adding a small amount of a water-soluble polymer made from maleic acid and olefins like isobutylene or styrene. This polymer improves the starch properties. The maleic acid polymer is prepared by dissolving maleic acid in solvent, adding the olefin, and polymerizing it. The maleic acid polymer is then mixed with water and alkali to make a soluble precursor. This precursor is added to the starch during gelatinization. After molding, the starch product has enhanced strength and water resistance compared to plain starch.

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A multi-layer food packaging cup that blocks oxygen and light to prolong product shelf life. The cup has four layers: (1) a barrier base layer, (2) a degradable filling layer, (3) a second barrier layer, and (4) an antibacterial coating. The barrier base layer uses pigments, graphene oxide, and a blocking agent in PP to block oxygen and light. The degradable filling layer helps the cup decompose in composting. The antibacterial coating prevents microbial growth. The multi-layer design improves oxygen and light barrier compared to single layers.

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A degradable plastic composite film comprising a polyurethane upper layer, a polylactic acid middle layer, and a polyacrylic acid lower layer, with the middle layer comprising calcium carbonate, soybean protein isolate, and polylactic acid, and the lower layer comprising polyacrylic acid. The composite film exhibits enhanced mechanical properties and superior degradation performance compared to conventional degradable plastics.

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A biopolymer-based gas and/or vapor barrier coating for packaging applications that provides stable barrier properties and enhanced adhesion to polyolefin substrates. The coating comprises a biopolymer layer with amidated and/or methylated pectin-derived polymer chains, which exhibits strong adhesion to polyolefin substrates after surface treatment. The coating achieves gas and vapor barrier properties while enabling effective anchorage of metal-based coatings on polyolefin substrates.

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Oriented composite film with enhanced gas barrier properties through the intentional incorporation of high-aspect-ratio two-dimensional nanosheets into polymer films. The film achieves superior barrier performance by incorporating ordered nanosheet layers that effectively intercalate between polymer chains, enhancing gas permeability control while maintaining structural integrity. This approach enables the creation of films with superior barrier properties compared to conventional polymer-based films.

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A biodegradable and recyclable packaging film that replaces aluminum foil in high-barrier packaging without sacrificing barrier properties. The film is made by laminating a paper layer with oxygen and moisture barrier properties of 0.01-1 cc/m2-day and 0.01-1 cc/m2-day respectively, with a biodegradable film layer. The biodegradable film can contain materials like PBAT, PBS, PHA, PLA, TPS, PVA, PCL, Oxo-PE, Oxo-PP. The film has barrier properties of 0.01-1 cc/m2-day for oxygen and 0.01-1 cc/m2-day for moisture. The laminated film can be biodegradable or biodegradable by microorganisms, moisture, oxygen, light, and

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A novel soy protein isolate film with enhanced mechanical properties and improved environmental performance. The film is prepared through a novel process that incorporates glycerin to enhance protein solubility and structure, while maintaining high mechanical strength and durability. The film exhibits superior tensile strength, elongation at break, and light transmission properties, with improved oxygen permeability compared to conventional soy protein isolate films. The process enables the production of films with high mechanical properties while maintaining environmental benefits through the use of glycerin as a solubilizing agent.

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Barrier material with enhanced barrier properties through a novel approach of combining biodegradable resins with water-repellent coatings. The material comprises a paper base material with a water-repellent layer followed by a biodegradable gas barrier layer. The biodegradable layer is composed of a bioplastic polymer such as polylactic acid or polybutylene succinate, which provides excellent barrier properties. The water-repellent layer is achieved through a water-repellent coating, such as paraffin-based or silicone-based materials, that enhances the gas barrier properties. This innovative combination enables both gas and water vapor barrier properties while maintaining biodegradability and low emissions.

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Packaging material for liquids or frozen food that combines re-pulpability with barrier properties. The material features a paperboard substrate coated with a polyolefin layer and a barrier layer comprising a water-soluble polymer, such as starch, applied between the polyolefin and the paperboard. The water-soluble polymer layer enables the material to be repulped after use, while the polyolefin layer provides barrier properties against moisture and oxygen. The barrier layer can further include pigments or additives to enhance its performance.

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