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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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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A high-barrier graphene-modified plastic that combines excellent mechanical properties with improved gas barrier performance. The modified plastic comprises a base material containing 6% graphene, stabilized by 2.5% ESO and 1% stearic acid, and processed with 1% stearic acid. The combination of graphene's exceptional barrier properties and the stabilizing effects of ESO and stearic acid enables enhanced gas barrier performance in packaging applications.

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A degradable film comprising multiple layers that enables controlled degradation through layer-by-layer degradation. The film comprises a base layer comprising a polymer matrix (such as PLA) and a degradation control layer comprising a degradation-inhibiting agent (such as quaternary salts). The film is prepared through a multi-layer process where the degradation control layer is incorporated into the base layer, enabling precise control over degradation time through layer composition and arrangement.

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Biodegradable multilayer film with high gas and moisture barrier properties for environmentally friendly packaging applications. The film consists of a base layer made of biodegradable resin, followed by a barrier coating layer, then an alternating sequence of barrier and moisture barrier coating layers. This provides excellent barrier properties against gases and moisture while being fully biodegradable. The film can be used in packaging applications that require biodegradability and compostability without relying on non-biodegradable barrier coatings.

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Polyvinylidene chloride/graphene composite material with enhanced barrier and conductivity properties. The composite material comprises a base material, a polyvinylidene chloride (PVDC) or graphene layer, and a substrate or adhesive layer. The PVDC/graphene layer contains 0.1-10 wt% graphene, providing both barrier properties and electrical conductivity. The composite material enables improved barrier performance compared to conventional PVDC films, while maintaining electrical conductivity for electronic applications.

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A degradable food packaging bag that combines biodegradability with enhanced barrier properties. The bag comprises a starch-based bioplastic matrix, a biodegradable barrier layer, and a biodegradable outer layer. The bioplastic matrix contains a blend of starch and other biodegradable polymers, while the barrier layer provides moisture and gas barrier properties. The outer layer is made from a biodegradable starch-based material. The combination of these layers enables the bag to maintain its integrity while biodegrading, with the barrier layer preventing moisture and gas ingress while the outer layer decomposes.

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Bio-based packaging container with high biomass content and high barrier properties. The container has a blank plate made of modified starch, petroleum-based polyolefin, and biomass polyolefin. This is combined with a high barrier film made of materials like PVDC, EVOH, or nylon. The high biomass content provides sustainability while the high barrier properties prevent oxygen and water ingress for food preservation. The biomass content in the packaging can be over 50%.

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Environmentally friendly packaging film with enhanced barrier properties for packaging applications. The film comprises a composition comprising 85-90% of a biodegradable and renewable polymer matrix, 5-10% of a barrier-enhancing additive, and 1-5% of a biodegradable and renewable polymer additive. The barrier-enhancing additive provides the film with superior barrier properties while the biodegradable and renewable polymer additive ensures the film's biodegradability.

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Preparing a UV-resistant, high-barrier packaging film using rectorite nanoparticles encapsulated in starch. The rectorite is ground into nanoparticles and mixed with starch and water to create a stable suspension. This is then spray dried to form rectorite nanoparticles covered in a starch layer. This starch-encapsulated rectorite is added to a vinylidene chloride emulsion to create a composite emulsion. The emulsion is coated onto a substrate film and dried to make the UV-resistant, high-barrier packaging film. The starch coating improves compatibility between the rectorite nanoparticles and the polymer matrix.

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A method for preparing highly hydrophobic polystyrene-polyvinylidene chloride (PVC) composite material through the controlled incorporation of PVC into polystyrene (PS) matrices. The process involves combining PVC with PS in a specific molar ratio to produce a composite material with enhanced hydrophobicity and barrier properties. The PVC incorporation enables the material to exhibit superior hydrophobicity compared to pure PS, while maintaining its excellent barrier properties. The PVC content can be precisely controlled to achieve the desired hydrophobicity level. This composite material has unique properties that make it suitable for applications requiring high hydrophobicity and barrier performance, particularly in food packaging applications.

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Ethylene-vinyl alcohol copolymer/phosphorylated soy protein isolate intercalated montmorillonite composite film for food packaging, comprising a polymer matrix containing ethylene-vinyl alcohol copolymer and phosphorylated soy protein isolate intercalated with montmorillonite, and a montmorillonite component with soy protein isolate content of 20% and sodium tripolyphosphate content of 3%. The film exhibits superior barrier properties, particularly enhanced barrier performance compared to conventional films, while maintaining biodegradability.

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Preparing biodegradable polymer barrier materials with enhanced water vapor and oxygen barrier properties through controlled multilayer structure design. The method involves creating alternating layers of biodegradable polymer barrier materials with hydrophobic and hydrophilic properties, respectively, through a process of extrusion and laminating. The multilayer structure is achieved through a specific layer multiplier that enables controlled deformation and orientation of the barrier layers during extrusion. This approach enables the creation of barrier materials with superior water vapor and oxygen barrier properties while maintaining stability in humid environments.

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A method for preparing high water vapor barrier biodegradable composite materials through melt processing. The method utilizes a biodegradable polymer matrix and a hydrophobic ester dispersed phase, where the ester phase is selectively dispersed within the polymer matrix. This composition combination enables enhanced water vapor barrier properties through controlled phase morphology, while maintaining biodegradability. The ester phase achieves superior hydrophobicity when combined with the polymer matrix, resulting in improved barrier performance across various humidity levels.

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A water vapor barrier paper for flexible packaging that combines barrier properties with heat-sealability. The paper achieves a water vapor permeability of 150 g/m2/24 h under tropical conditions (38°C, 90% RH) while maintaining barrier performance under temperate conditions (25°C, 75% RH). The paper's unique formulation enables uniform coating of the fibrous substrate during on-line manufacturing, ensuring consistent barrier properties throughout the production process.

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High barrier composite film made from polylactic acid (PLA) and starch for food packaging that provides improved gas barrier properties, biodegradability, and mechanical strength compared to PLA alone. The composite structure has an outer PLA layer sandwiched between an inner starch nanocomposite layer. The nanocomposite layer thickness is 50-90% of the composite film. The nanocomposite layer improves barrier properties while the PLA provides strength and biodegradability.

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A composite film for food packaging made of a sandwich structure with a polyhydroxy fatty acid ester outer layer and an inner starch nanocomposite layer. The starch nanocomposite layer thickness is 40-90% of the total film thickness. The composite film provides high barrier properties and biodegradability with reduced cost compared to using pure polyhydroxy fatty acid esters. The starch nanocomposite layer improves strength and hardness of the polyhydroxy fatty acid ester layer.

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A high barrier composite film made from polybutylene terephthalate (PBT) and starch. The composite film has improved properties like barrier properties, strength, and biodegradability compared to pure PBT films. The composite film has a PBT middle layer sandwiched between starch nanocomposite layers. The starch nanocomposite layers improve the barrier properties, while the PBT layers provide strength. The starch nanocomposite is made from modified starch, polyvinyl alcohol, carboxymethyl cellulose, polycaprolactone, montmorillonite clay, maleic anhydride, zinc, calcium stearate, and monoglycerides. The composite film can be made by co-extrusion of the layers.

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A high-performance barrier double bond functionalized graphene/polyethylene composite film for packaging applications. The film combines graphene oxide layers with polyethylene, achieving superior gas barrier properties through a single-step process. The graphene oxide layers enhance the film's barrier performance by introducing double bonds, while the polyethylene matrix provides structural integrity. The process involves granulation of the functionalized polyethylene pellets at elevated temperatures, followed by drying and subsequent mixing with graphene oxide. This approach enables the production of high-performance composite films with improved gas barrier properties compared to traditional double bond functionalized graphene/polyethylene systems.

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Flexible packaging film made from compostable, bio-based materials that can be used in packaging products. The film has a compostable heat sealable layer containing a biobased polymer with a lower melting point than its first melting point. This allows it to be coextruded as a heat sealable layer on a biaxially oriented multilayer film. The film also has a barrier layer made from a bio-based polymer with a melting point close to the heat seal layer's first melting point. The barrier layer prevents oxygen and moisture transmission while the heat sealable layer seals the film. This enables using compostable, biobased materials for packaging applications where barrier and sealing properties are needed.

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A biodegradable silage film made from a thermoplastic composition comprising a starch phase and a polyolefin phase. The film is produced through a single-step process of stretching the thermoplastic composition in both longitudinal and transverse directions at elevated temperatures, resulting in a multilayer structure with alternating starch and polyolefin layers. The film exhibits superior oxygen barrier properties compared to conventional polyethylene films, while maintaining good mechanical strength and printability. The film can be formed directly from the thermoplastic composition without requiring multi-layer extrusion or lamination.

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High barrier biodegradable agricultural mulch film for agricultural applications that combines improved barrier properties and tear resistance. The film is prepared by processing a biodegradable plastic substrate, polypropylene carbonate (PPC), with inorganic fillers and coupling agents. The PPC substrate is first treated with surface modification, followed by drying and then extrusion into a granular form. The granular material is then mixed with PPC and fillers, processed with plasticizers and crosslinking agents, and extruded into a film. The resulting film has enhanced barrier performance and tear resistance, making it suitable for agricultural applications where moisture and mechanical integrity are critical.

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Three-layer co-extrusion rapid biaxial stretching polyethylene film for packaging applications, comprising a surface layer comprising low-density polyethylene (LDPE) and metallocene polyethylene (m-LLDPE), a barrier layer comprising ethylene/vinyl alcohol copolymer (EV0H), and a heat sealing layer comprising ultra-high molecular weight polyethylene (UHMWPE). The film has a wide width, high draw speed, and uniform thickness, with the surface layer providing barrier properties and the barrier layer offering chemical resistance.

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Thermoplastic film comprising starch and poly-controlled phase-control association, and a method for producing the film through high-temperature stretching. The film has a smooth surface, low haze, and excellent printability. It exhibits low oxygen permeability, low water vapor permeability, and acceptable mechanical properties, including high gloss and low haze. The film is produced by stretching thermoplastic starch and poly-controlled phase-control association at elevated temperatures in the machine direction and transverse direction.

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High-barrier transparent PET composite film with enhanced barrier properties through the use of boron nitride nanosheets. The film is prepared by dispersing boron nitride nanosheets in a water-soluble polymer dispersion, followed by a PV0H-based aqueous solution treatment. The dispersion is then applied to a PET substrate, followed by hot air drying. The resulting film exhibits superior barrier properties while maintaining transparency and optical clarity.

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Bio-based high barrier sheet for packaging applications that uses renewable materials instead of petroleum-based plastics. The sheet has at least one bio-based plastic layer and at least one bio-based barrier layer. The barrier layer improves water and oxygen resistance compared to the bio-based plastic alone. The sheet can be prepared by coextrusion of the bio-based layers.

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Polyvinylidene chloride (PVDC) composite film with enhanced barrier and electrical conductivity properties, achieved through the incorporation of graphene nanosheets. The composite material combines PVDC polymer with graphene, resulting in a film that exhibits significantly improved barrier properties against water vapor and oxygen, while maintaining electrical conductivity. This composite material enables enhanced barrier performance in packaging applications, particularly for medical and food packaging.

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A reactive extrusion process for preparing PLA/PA/PP composite materials through a novel ternary blend approach. The process combines PLA, PA, and PP in a single melt, enabling the creation of a composite material with improved performance characteristics compared to conventional blends. The ternary blend formulation achieves enhanced mechanical properties, improved thermal stability, and enhanced barrier properties through optimized molecular interactions between the three polymers. This approach enables the production of a material with superior performance characteristics for applications requiring both mechanical strength and barrier properties.

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Food packaging using a biodegradable polymer derived from β-phellandrene, a compound found in plants and produced by microorganisms. The packaging has at least one layer containing the β-phellandrene polymer, which has specific properties like a density of 0.85-1.0 and a glass transition temperature of 80°C or higher. The polymer is produced through polymerization of β-phellandrene monomers using a catalyst. The food packaging provides a sustainable, carbon-neutral alternative to traditional petroleum-based plastics.

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Biodegradable material with barrier properties suitable for applications like packaging where biodegradability is desired. The composition contains a biodegradable polyester as the primary component along with small amounts of waterproofing agents. The biodegradable polyester provides the barrier properties while the waterproofing agents enhance water vapor resistance. The composition can be made using specific types of vaseline, methyl silicone oil, isobutylene, and glycerides.

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Multilayer film for packaging, comprising at least two layers A and B, with improved barrier properties, renewable raw materials, and biodegradability. The film has enhanced oxygen and water vapor barrier performance, mechanical strength, and light transmittance. The multilayer structure incorporates at least one layer A with a specific composition and processing method, such as polybutyric acid (PHB) or polyvinylvalerate (PVV), to achieve the desired properties while maintaining biodegradability.

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A biodegradable plastic film that combines high barrier performance with enhanced oxygen barrier properties, achieved through the incorporation of microcrystalline starch with short-chain linear microcrystalline structure. The film's unique composition, comprising starch-based plastic with acetic acid glycol pre-polymer, enables superior barrier properties while maintaining biodegradability. This innovative approach eliminates the need for conventional plasticizers and volatile organic compounds, making it suitable for a wide range of applications where biodegradability and barrier performance are critical.

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High barrier polyethylene film for packaging applications that combines excellent gas barrier properties with enhanced mechanical performance. The film comprises an ethylene-vinyl alcohol copolymer with a specific molecular structure that balances gas permeability with mechanical strength. This copolymer enables superior barrier performance compared to conventional polyethylene films, while maintaining the film's transparency and optical clarity. The film's unique molecular structure enables optimal barrier properties through its specific crystallinity and molecular arrangement, making it suitable for applications requiring both gas protection and mechanical integrity.

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