Oxygen Scavenger for Polyethylene Terephthalate(PET)

Novel esterases with improved activity and/or thermostability in acidic conditions for degrading polyesters, particularly polyethylene terephthalate (PET). The esterases exhibit enhanced activity and stability at pH 3-6, with specific substitutions at positions E141, G171, and V180, and other positions, compared to parent esterases. The variants can be used for PET degradation, with applications in textile, packaging, and automotive industries.

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A beverage container with reduced oxygen exposure, comprising a body portion of polyethylene terephthalate (PET) material, one or more oxygen scavengers interspersed within the PET material, and one or more passive oxygen barriers interspersed within the PET material. The oxygen scavengers and passive oxygen barriers are blended or layered during the manufacturing process to create a container that reduces oxygen exposure to beverage products, preventing off-flavors and extending shelf life.

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Oxygen scavenging formulation for PET packaging that maintains transparency during recycling. The formulation comprises a blend of glycerol oleate and polyamide components, with the oleate component comprising at least 20% of the total formulation. The oleate component provides the oxygen-scavenging properties while maintaining the optical clarity of PET, enabling direct recycling of PET bottles with pure PET containers.

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Oxygen-absorbing film and adhesive composition that combines high adhesiveness and oxygen absorption ability. The film has an oxygen-absorbing adhesive layer made from a composition containing an oxygen-absorbent resin, a curing agent, and optionally a catalyst. The adhesive resin has a lowest glass transition temperature below 0°C. This enables good adhesion and film strength even after oxygen absorption and volume shrinkage. The curing agent promotes crosslinking during aging to improve cohesiveness.

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Oxygen-absorbing packaging material for food and beverages, comprising a multi-layer film with an oxygen-absorbing layer, a gas barrier layer, and a polyolefin layer. The oxygen-absorbing layer contains a deoxidant composition comprising iron powder, calcium oxide, and titanium dioxide, which absorbs oxygen and prevents spoilage. The film also exhibits excellent light blocking and odor suppressing properties, making it suitable for packaging a wide range of food and beverage products.

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Active packaging techniques like oxygen scavengers have gained enough attention from consumers in the past few years. It would be of great advantage if metal-based scavengers were replaced with plant-based...

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Substantially transparent oxygen scavenging packaging material for protecting oxygen sensitive products like food, beverages, and pharmaceuticals. The packaging material contains a composition with a base polymer, an oxidizable organic component, and a transition metal. The oxidizable component scavenges oxygen to extend product shelf life. The composition has low haze due to improved dispersibility and reduced adverse crystallization effects. It can be used in walls of containers, films, and trays to scavenge oxygen permeating through the barrier.

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Two-part masterbatch for making oxygen barrier packaging articles like plastic bottles. The masterbatch contains an unsaturated thermoplastic polymer with high iodine value (10 or more) in one part and an oxygen scavenging catalyst in another part. The two parts are separate solid particles or liquid. This allows recyclable oxygen barrier packaging by combining the parts during processing. The unsaturated polymer scavenges oxygen while the catalyst enhances the reaction.

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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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A polyester composition comprising poly(alkylene-2,5-furandicarboxylate) (PEF) and an oxygen scavenger composition that includes a polybutadiene sacrificial material, an oxidation catalyst, and optionally a carrier and compatibilizer. The composition exhibits improved barrier properties against oxygen permeation, particularly suitable for packaging oxygen-sensitive products such as beer.

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Abstract During the last decades, the food industry has seen several changes in packaging technology and applications because of new consumer demands and market trends. These drivers can be summarized as requirements for high quality, freshness, extended shelflife, and security of food products. Oxygen scavengers, as a type of active packaging, absorb the dissolved oxygen or the oxygen in the headspace to protect the oxygensensitive food products against oxidative degradation. In this review, organic and inorganic oxygen scavengers such as iron, ascorbic acid and its derivatives, illuminationactivated scavengers, reducible organic compounds, and unsaturated hydrocarbonbased scavengers, including polyunsaturated fatty acids and polybutadiene, have been thoroughly discussed, and the mechanism of action of each system is briefly explained. In addition, some of the issues associated with the applied traditional transition metal catalysts to accelerate the oxidation rate in oxygen scavenging systems are listed, and the results from a recent study directed towards addressing those conc... Read More

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Abstract This study focused on characterization of Volatile Organic Compounds (VOCs) as contaminants and non-volatile additives in Italian PET bottles, also suggesting potential functional aldehydes scavengers. Several VOCs, such as acetic aldehyde (AA), butanal, 3-methyl butanal, 1,3-dioxolane, pentanal, hexanal, octanal, 5-hepten-2-one, nonanal, and decanal, were identified by Head Space-Gas Chromatography/Mass Spectrometry (HS-GC/MS) in the PET bottles used for the packaging of six Italian brands mineral waters. AA, 1,3-dioxolane, octanal, 5-hepten-2-one, nonanal, and decanal were the most abundant compounds identified. These contaminants were also identified in the PET-bottled mineral waters. Different experiments using bottle-grade PET pellets (Btlg-PET) and PET bottles fragments with and without the addition of epoxidized soybean oil (ESBO) or erucamide as lubricant/plasticizer additives, poly(m-xylene adipamide) (MXD6), and/or anthranilamide (2-aminobenzamide) as potential aldehydes scavengers were carried out. Mostly VOCs observed in the PET bottles analysed were identified ... Read More

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Oxygen-absorbing agent for unsaturated polyester resins that enables efficient crosslinking and curing reactions in the presence of oxygen. The agent comprises a specific compound with a polysubstituted vinyl group and a transition metal salt, which together exhibit enhanced oxygen-absorbing properties. The agent can be incorporated into resin compositions, including unsaturated polyester resins, vinyl ester resins, and other oxygen-sensitive polymers, to prevent oxygen inhibition and promote complete curing.

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This chapter deals with recent advances in smart packaging, its trends, and applications in industries. Requirements of the compound or material to besat is factorily used as oxygen scavenger in the food industry must be: The use of iron, zinc or magnesium powders as oxygen scavengers to remove oxygen from the headspace of packaged cans are most widely used agents. The metalpowders' used as oxygenscavengers paved the way for the subsequent development of the commercially available metal based oxygen scavengers. Iron powder-basedoxygen scavengers are the most commonly used oxygen scavengers for the commercial purposes. Metal based oxygen scavengers can be included in the food packages in the form of sachets, films, labels or strips. Organic oxygen scavengers are such a low molecular weight organic compounds whose side chains reacts with oxygen or the backbone breaks apart when polymer in which they are incorporated reacts with oxygen.

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An oxygen absorbent for coating materials that accelerates curing and prevents surface stickiness. The absorbent contains a novel unsaturated double bond-containing compound that exhibits higher oxygen radical scavenging activity than existing oxygen absorbents. The compound is represented by the formula (I) and can be synthesized through ring-opening of an epoxy compound. The oxygen absorbent is used in combination with a radical-polymerizable resin, such as an unsaturated polyester resin, to improve curing performance and prevent surface defects.

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An oxygen-absorbing resin composition for packaging containers, comprising an oxygen absorber containing iron powder and a metal halide, and a resin with an aluminum content of 50 ppm by mass or less. The composition achieves improved oxygen absorption performance by suppressing the formation of an aluminum oxide film on the iron powder, which inhibits oxygen absorption.

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Several packaging solutions for the food industry have to consider the harmful effects of oxygen within a pack for packaging of oxygen sensitive foods. This issue can be addressed by using oxygen scavengers. However, in adverse cases, conventional oxygen scavengers react too slowly to reduce the access of oxygen to sensible foods. Therefore, several alternative approaches for oxygen scavengers are in focus right now. In this work, an oxygen scavenger system based on vacuum-deposited palladium (Pd) on PET films was tested. Pd catalyzes the reaction of headspace oxygen, remaining in food packages, with hydrogen. The hydrogen can be provided by modified atmosphere packaging. To improve the substrate surface, an additional silicon oxide (SiOx) layer was applied to the films before Pd deposition. To determine the oxygen-scavenging activity, the Pd-metalized films were placed into airtight cells. These cells were flushed with a gas mixture containing 95 vol.-% nitrogen and 5 vol.-% hydrogen. Defined amounts of oxygen were injected into the cells. The kinetic parameters of Pd-metalized film... Read More

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We report an electroreforming strategy to upcycle waste PET into value-added chemicals and H 2 using Pd as the anode and Ni foam as the cathode.

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The oxygen transmission rate of a PET coated film showed a 37-fold decrease using a dispersion of LDH nanosheets in polyvinyl alcohol that was prior aged for 8 weeks compared to the film coated with the equivalent freshly prepared LDH/PVA dispersion.

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Pouch with an oxygen scavenger to prolong the shelf life of consumables like e-vaping cartridges by reducing oxygen levels inside the pouch. The pouch material is gas and moisture impermeable. An oxygen scavenger strip is adhered to the inside of the pouch and sealed inside along with the consumable. The strip contains an oxygen scavenging material like iron fragments in a polymer matrix. The strip reduces oxygen concentration below 0.1% in 17 days, preventing oxidation and flavor degradation of the consumable.

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