Developments in Ethylene-Methyl Acrylate Copolymer for Packaging

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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Laminate for packaging applications with improved gas barrier properties after retort treatment. The laminate has an anchor coat layer, a vapor deposition layer, and a barrier coat layer on a polyolefin substrate. The anchor coat layer contains a resin with methyl (meth)acrylate and a polar group-containing (meth)acrylic ester or (meth)acrylic acid, a curing agent, and a silane coupling agent. The polar group is selected from hydroxyl, amide, amino, phosphate, or epoxy. The mixing ratio of methyl (meth)acrylate to polar group-containing (meth)acrylic ester or (meth)acrylic acid is 5-900:100. This anchor coat layer provides good adhesion between the polyolefin substrate and the

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Laminated packaging materials with improved barrier properties and handleability. The laminate structure includes a paper base, barrier layer, and gas barrier layer. The barrier layer contains polyolefin resin and (meth)acrylic resin, with specific composition ratios. The gas barrier layer can have a gas barrier resin. This allows balancing barrier performance with handleability compared to traditional barrier coatings. The (meth)acrylic resin glass transition temperature is -60°C to 10°C. The polyolefin resin content is 6-94% and (meth)acrylic resin is 6-94%.

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Flexible packaging made from nylon (BOPA) and linear low density polyethylene (LLDPE) that can be thermally recycled without degradation. The key innovation is using a specific additive, PE-gMAH, in the LLDPE to make it compatible with the BOPA when melted. This allows recycling the mixed plastic packaging back into new packaging without needing virgin material. The additive is incorporated into the LLDPE during processing before forming the packaging film.

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Composition for preserving plant freshness that can prevent excessive torque during kneading and includes a (meth)acrylic resin, an anti-aging agent, and a porous material. The (meth)acrylic resin has structural units derived from (meth)acrylic acid esters and α-olefins. The composition can be used in products like laminates, labels, and packaging materials to extend the shelf life of fruits and vegetables.

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Heat-sealable multilayer film with improved slipperiness, transparency, strength, and processability for medical packaging applications. The film has layers including a heat-seal layer containing an ethylene-methyl acrylate copolymer and an unsaturated fatty acid amide. This layer is adjacent to a layer containing a polyolefin resin like polyethylene. The film has a layer containing a polyamide resin like nylon. The film has excellent heat sealability, barrier properties, and slipperiness to prevent blocking during processing. The film can be manufactured by coextrusion or sequential lamination.

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A container for sealed packaging like a plastic cup with a lid that addresses the issue of poor sealing and opening properties when using polyester resin containers. The container has a polyester resin layer on the open end face. To improve sealing and opening, an additional coating layer is laminated onto the polyester layer. The coating layer contains a specific composition of ethylene-methyl methacrylate copolymer (EMMA) and polyethylene. The EMMA content is 60% by weight or more. This coating layer is exposed on the container end face.

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Food packaging material replacement for high impact polystyrene (HIPS) and polyvinylidene chloride (PVdC) in food packaging to eliminate migration concerns. The replacement is a formable sheet and packaging structure made with specific combinations of materials like post-consumer recycled PET, polypropylene, ethylene methyl acrylate, ethylene/methyl acrylate/glycidyl methacrylate, and blue-white color concentrate. The materials are co-extruded to replace HIPS/PVdC while maintaining properties like strength, oxygen barrier, trim force, seal/peel, hot fill resistance, and impact resistance. The co-extrusion obviates the need for adhesives and improves oxygen migration resistance, trim quality, and hot fill resistance compared to conventional PET.

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Packaging material for food products that replaces problematic materials like HIPS and PVdC. The packaging comprises a multilayer structure made of specific compositions like PET, post-consumer resin (PCR) PET, polypropylene (PP), ethylene methyl acrylate (EMA), ethylene/methyl acrylate/glycidyl methacrylate terpolymer (EMAGMA), and PEI coating. The layers are arranged in a specific order to provide strength, barrier, and trimming properties. The core layer uses PCR PET with additives like nucleating agents and colorant. The barrier layer uses PCR PET, EMA, EMAGMA, and optionally PP. The sealing layer uses PCR PET and optionally PP. The layers are joined by co-extrusion, melt extrusion, or ad

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Heat-sealable multilayer film for medical packaging with improved slipperiness and workability. The film has a heat seal layer containing an ethylene-methyl acrylate copolymer and an unsaturated fatty acid amide. This layer sandwiches a polyamide layer and a polyolefin layer. The film has excellent transparency, strength, and slipperiness compared to conventional multilayer films. The slipperiness prevents blocking during processing and filling. The film can be used for medical packaging by heat sealing it with a nonwoven fabric lid.

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Multilayer film for heat-sealable packaging applications like food packaging that provides improved seal strength and adhesion to materials like APET trays. The film has a sealant layer with specific properties to enable strong seals. The sealant layer is a copolymer of ethylene and alkyl acrylate with a melt index of 2-30 g/10min, low crystallinity (30% or less), and melt flow of 1.0 g/10min or more. This copolymer composition provides optimal balance of sealing properties. The film also has an upper layer in contact with the sealant layer to adhere to the sealant.

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Multilayer packaging film that enables easy, clean opening of containers without tearing or residue outside the seal line. The film has a specific layer structure: an inner seal layer, an adhesion promoting layer, and an outer layer. The adhesion promoting layer is made of a modified olefin polymer mixed with acrylate polymers. It allows peelable cohesive tearing rather than sticking when the seal is broken. The modified olefin polymer provides initial adhesion to the seal layer, while the acrylate polymers promote clean tearing.

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Polyester trays with improved adhesion to lidding films for food packaging. The trays have a bulk layer made of crystalline polyethylene terephthalate (CPET) and a capping layer directly contacting the bulk layer. The capping layer is a copolymer containing ethylene and a second unit selected from acrylate, vinyl acetate, or anhydride/carboxylic acid. This copolymer composition provides better adhesion to CPET compared to traditional lidding materials, enabling stronger seals between the tray and lidstock. The copolymer capping layer can also form a film.

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A cover tape for packaging electronic components that prevents blocking and damage to antistatic properties during storage and transportation of rolls. The cover tape has a low peel strength when heat sealed to prevent blocking between rolls. The low peel strength is achieved by having a sealant layer with a specific composition and thickness, sandwiched between a base layer and an intermediate layer. The sealant layer contains a styrene-methyl acrylate copolymer. The intermediate layer contains a low-density polyethylene. The base layer can have an antistatic coating. The low peel strength prevents blocking between rolls during storage without impairing the antistatic properties of the tape.

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Container for sealed packaging and sealed packages themselves that have improved sealing and opening properties. The container has a polyester resin layer on the open end face. Additionally, a coating layer containing an ethylene-methyl methacrylate copolymer (EMMA) is laminated on the polyester layer. This coating prevents crystallization of the polyester during sealing, improving sealing strength and preventing stick-slip issues when opening the lid. The EMMA coating also enhances the container's resistance to heat and moisture. The sealed packages are made by heat-sealing the container with a lid having a polyolefin adhesive layer.

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Multilayer packaging film with easy peelable seals for two-piece containers like food packaging. The film has a sealing layer made of heat-sealable olefin polymer, an adhesive layer between the sealing layer and container made of modified olefin polymer with a small amount of (meth)acrylate polymer, and optional layers for barrier, amide adhesion, and carrier. The modified olefin adhesive layer peels easily from the container when opened, without tearing or residue, while the sealing layer provides strong seals. The modified olefin adhesive layer prevents adhesion of the sealing layer to the container during sealing. The (meth)acrylate polymer in the adhesive layer promotes peelability.

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Easy-open packaging with a multilayer film that allows clean, controlled tearing when opening without residual film on the container. The film has a sealing layer made of heat-sealable olefin polymer, a separate peelable adhesive layer made of modified olefin polymer with a small amount of acrylate, and other layers. The modified olefin adhesive layer separates easily from the sealing layer during opening, preventing residue on the packaged item.

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An ethylene-vinyl alcohol-based polymer alloy composition for packaging materials that has improved heat seal strength and reduced adsorption of aroma components compared to ethylene-vinyl alcohol copolymers alone. The alloy is made by blending ethylene-vinyl alcohol copolymers and ethylene-methyl acrylate copolymers in specific ratios. The blended composition has a heat seal strength of 200 gf/15 mm or more and adsorbs menthol at 1.0 mg/week or less, reducing odor transfer from packaged products. The alloy is prepared by reactive processing of the copolymer mixtures.

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Multilayer film for packaging with improved shock resistance, flexibility, and pinhole prevention compared to conventional multilayer films. The film has a repetitive lamination structure with alternating layers of materials like olefin copolymers and adhesives. This repetitive lamination provides shock absorption and reduces stress concentration. It also has an inner oxygen barrier layer sandwiched between the repetitive layers to prevent pinholes. The repetitive layers can be made of materials like LLDPE-g-MAH, EVA, and EMAA resins. The film can be used for packaging food, medical supplies, electronics, etc. where shock resistance, flexibility, and pinhole prevention are required.

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A hybrid packaging material that combines the benefits of paper and polymer films. The material is a layered structure with an inner polymer film layer and an outer paper layer. The polymer film provides barrier properties against oil and moisture, while the paper adds stiffness and tearability. The polymer film is a blend of low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ethylene-methyl acrylate copolymer (EMA) with reduced melting point compared to pure LLDPE. This enables heat sealing at lower temperatures and higher speeds. The paper layer can have a coating or treatment to enhance adhesion to the polymer film.

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