Oxygen Barrier Adhesives for Food and Beverage Packaging

A laminated sheet material for food containers that combines a paper substrate, a metal or metal oxide layer, and a gas barrier layer comprising a polymer. The metal layer is in direct contact with the paper substrate, which has been surface-modified to improve adhesion. The gas barrier layer is preferably an ethylene vinyl alcohol copolymer (EVOH) applied by extrusion coating, and may be biobased. The laminated sheet material provides improved mechanical strength, chemical resistance, and barrier properties compared to conventional laminates.

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Reducing oxygen degradation of liquids contained in sealed containers by using a combination container with an inner container that has oxygen permeability and an outer container with an oxygen barrier. The inner container with oxygen permeability contains the liquid and is sealed by a stopper. An oxygen absorber is placed between the inner container and the outer container to absorb oxygen. The outer container with the oxygen absorber prevents external oxygen from reaching the inner container. This provides a sealed environment with reduced oxygen levels to prolong the shelf life of the contained liquid.

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Laminate for paper containers that prevents bubble formation during assembly while maintaining high adhesive strength between layers. The laminate comprises a thermoplastic resin layer, an adhesive layer, and a barrier layer, with the adhesive layer containing a resin composition that includes an ethylene/unsaturated carboxylic acid/unsaturated carboxylic acid ester copolymer. The adhesive layer has a melt flow rate of 190°C and a load of 2160 g at 9.0 g/10 min or less, as specified by JIS K7210: 1999. This composition enables effective adhesion between the adhesive layer and barrier layer while preventing bubble formation during assembly.

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A multilayer film for packaging applications that combines the benefits of high-performance polyester resins with oxygen barrier properties. The film comprises a polyester resin layer with diol and dicarboxylic acid residues, followed by a vinyl alcohol-based copolymerized resin layer that provides enhanced barrier properties. The multilayer design enables superior oxygen barrier performance while maintaining mechanical strength, transparency, and recyclability of the polyester resin.

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A multilayer polymer foam film for aseptic packaging applications, comprising a foam layer with at least 10% closed cells, sandwiched between two HDPE skin layers and an EVOH barrier layer. The film exhibits improved oxygen barrier properties and resistance to physical damage during processing, enabling its use as a direct replacement for paperboard packaging.

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Multilayer body with enhanced gas barrier properties and adhesion, particularly in packaging applications, achieved through a novel multilayer structure. The body comprises a base layer with a metal oxide inorganic layer, followed by a resin layer with a low glass transition temperature, and a water-soluble polymer layer. This multilayer design ensures excellent adhesion between layers while maintaining high gas barrier properties through the metal oxide layer. The base layer provides mechanical integrity, the resin layer provides barrier properties, and the water-soluble polymer enhances adhesion.

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An ethylene-vinyl alcohol copolymer resin composition that exhibits improved gas barrier properties in high humidity environments. The composition comprises an ethylene-vinyl alcohol copolymer (EVOH) and a metal compound, with the EVOH having a specific ethylene content and melt flow rate. The metal compound is dispersed within the EVOH, and when the composition is exposed to high humidity, the metal compound interacts with the EVOH to enhance its gas barrier properties.

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Transparent dual-protection high barrier film for food packaging that provides excellent oxygen and moisture barrier properties while allowing identification of the contents. The film is made of layers: a main barrier layer of ethylene-based resin, an oxygen barrier layer, and two tie layers to bond the barrier and oxygen layers to the outer layers. This three-layer structure provides dual protection against oxygen and moisture. The transparent ethylene barrier layer blocks moisture, and the oxygen barrier layer blocks oxygen. The tie layers bond the layers together. The ethylene barrier layer is made of a resin like ethylene vinyl alcohol (EVOH) with ethylene content between 29-44 mol%. The tie layers are made of a tie resin like ionomer. The film can be made by coextrusion. It is used in packaging laminates that replace aluminum foil in high barrier applications.

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A polyethylene composition for barrier applications, comprising a blend of two ethylene copolymers with distinct properties. The first copolymer has a low melt index, narrow molecular weight distribution, and low density, while the second copolymer has a higher melt index, narrower molecular weight distribution, and higher density. The blend exhibits improved barrier properties, high load melt index, and a unique molecular weight distribution profile. The composition is prepared using a dual reactor solution polymerization process with single-site catalysts.

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Multilayer barrier film with high oxygen barrier and transparency for packaging applications. The film has alternating layers of an aliphatic polyester resin and a butenediol vinyl alcohol copolymer or an ethylene vinyl alcohol resin. This structure provides low oxygen permeability for packaging while maintaining transparency. The film is made by alternately extruding and laminating the resins, then stretching and heat-setting. The film has oxygen permeability less than 30 cc/m2·atm·day and can be used for packaging prone to oxygen degradation.

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Packaging is a major topic in its own right. In this chapter, we examine general guidelines and packaging options for proper in-home storage of dried food products. Vacuum sealing is presented as a convenient and economical way to package dried materials. The use of oxygen and moisture absorbers is revisited. The importance of having effective barriers to oxygen and moisture transmission through the packaging is discussed. Sources of regulations regarding commercial food packaging are provided for those who wish to sell their dried products.

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Recyclable paper-based packaging material with high barrier properties against moisture and oxygen. The material has a multilayer structure that includes a paper layer, a thin metallization layer, a binder layer, and a thick barrier layer of pure PVDC. The PVDC provides excellent oxygen barrier and heat sealability without modifying its properties by additives. The intermediate binder layer enhances adhesion between the metallization and PVDC layers. The paper layer provides mechanical robustness. The recyclable packaging material has barrier properties comparable to plastic packaging while avoiding the issues of incompatibility with paper recycling processes.

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Gas barrier laminate for packaging that combines paper's dead-fold properties with high water vapor barrier performance after folding, while reducing plastic usage. The laminate structure consists of a paper substrate, an anchor coat with polyvinyl alcohol or polarized polyolefin, a vapor deposition layer, an adhesive layer, and a sealant layer. This allows the paper to fold without creasing and maintain barrier properties, reducing plastic compared to fully plastic laminates.

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Laminated packaging material for pouch containers of liquid, semi-liquid, and viscous food products that provides improved barrier properties and package integrity compared to conventional carton packaging. The material has a cellulose-based bulk layer, a barrier layer between the bulk and inner layer, and an inner polyethylene film. The polyethylene film has specific properties like thickness, composition, and orientation to balance strength and openability. The barrier layer can be a metal foil or coated paper. The inner film improves barrier and sealing while reducing foil use. The layered structure provides good barrier, strength, and sealing properties for pouch packaging of sensitive foods.

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Biodegradable polymers have become a topic of great scientific and industrial interest due to their environmentally friendly nature. For the benefit of the market economy and environment, biodegradable materials should play a more critical role in packaging materials, which currently account for more than 50% of plastic products. However, various challenges remain for biodegradable polymers for practical packaging applications. Particularly pertaining to the poor oxygen/moisture barrier issues, which greatly limit the application of current biodegradable polymers in food packaging. In this review, various strategies for barrier property improvement are summarized, such as chain architecture and crystallinity tailoring, melt blending, multi-layer co-extrusion, surface coating, and nanotechnology. These strategies have also been considered effective ways for overcoming the poor oxygen or water vapor barrier properties of representative biodegradable polymers in mainstream research.

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Co-extruded multilayer polymeric films for packaging flowable products like beverages that provide improved toughness, barrier properties, and recyclability compared to existing films. The films have a unique composition with a small amount of high barrier EVOH core sandwiched between inner and outer sealant layers. The EVOH core has low weight fraction and thickness, around 0.1-5% of the total film. The rest of the layers are ethylene/alpha-olefin copolymers. This balance allows good barrier, toughness, and recyclability for flexible bags filled with flowable products.

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The integrity of a package must be maintained by a material that can be heat sealed, particularly in medical, food, and pharmaceutical packaging applications. Obtaining an appropriate heat seal in packaging is crucial since, compared to package failure, heat seal failure is a more common reason for product degradation. Material selection and packaging methods should be evaluated carefully to choose the proper material that can effectively function under proper conditions. Hermetic seal property ensures the effectiveness of barrier layers in preventing oxygen permeation, loss of odor, and transmission of water vapor. Polylactic acid (PLA) is one of the biodegradable polymers with the greatest potential for heat sealing and thermal processing. To establish manufacturing protocols, verify seal effectiveness, and ensure product integrity, it is essential to consider the effects of controlling process parameters during package design. Therefore, to undercover the role of PLA structure on its properties, the factors impacting its heat-sealing feature are elaborated on in this chapter. More... Read More

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Oxygen-absorbing film for packaging that combines high oxygen barrier properties, non-sorption of aroma components, and excellent tearability. The film comprises a surface substrate layer with oxygen barrier properties, an oxygen-absorbing resin layer containing a specific polyester-based resin, and an inner surface substrate layer containing a stretched PET substrate. The oxygen-absorbing resin layer is formulated with a specific isocyanate-based curing agent to achieve optimal oxygen absorption performance while maintaining heat seal strength and laminate integrity.

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Oxygen-absorbing compound for packaging applications, comprising a five-membered ring with an electron-donating organic group bonded to it. The compound is used in an oxygen-absorbing adhesive composition and coating composition that exhibit excellent oxygen absorption properties while generating minimal odor. The adhesive composition is suitable for forming an adhesive layer in laminates for packaging materials, while the coating composition is used to form a coating layer on the surface of packaging materials.

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Gas barrier film and packaging material with improved oxygen barrier properties and adhesion. The gas barrier film contains a resin with a carboxyl group-containing polymer and a resin with a dehydration condensation compound like phosphoric, sulfuric, or nitric acid. This provides better barrier performance compared to conventional films. The dehydration condensation compound promotes adhesion between the resins. An adjacent layer with compounds like aluminum oxide, silicon oxide, or silicon nitride further enhances barrier properties. The film can be used as a substrate in laminates and packaging materials.

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