Property Blending for Packaging Materials

Hybrid clamshell container for packaging products that has a base made of a cellulosic material like paperboard and a cover made of a plastic material. The container has a hinged lid that folds over and clips to the sides in the closed position. This allows the strength and recyclability benefits of paperboard for the base while using plastic for the cover to improve durability and stackability. The container can be formed by manipulating a blank with separate paperboard and plastic components that join together.

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Stretched film containing a specific blend of two polyamide resins that provides excellent transparency and prevents irregular reflection. The film has a polyamide resin (a1) with diamine and dicarboxylic acid units, 70 mol % derived from xylylenediamine and sebacic acid, blended with a polyamide resin (a2) containing 35 mol % linear alkylene units. The blended film has a mass ratio of (a1) to (a2) from 5/95 to 30/70. This composition allows the (a1) resin to disperse well in (a2) to prevent light scattering. The film can further have a barrier layer with similar (a1) chemistry and the barrier and stretched film should be stretched at the same ratio.

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Adhesive structure for packaging boxes that improves adhesion strength between side plates by using different adhesives with complementary properties. The structure involves two adhesive types, like hot melt and water-based emulsion, applied side by side on the side plate folding surfaces. An adhesive hole is formed between the adhesive sections. The holes are filled with either adhesive type to increase adhesion area. This leverages the advantages of each adhesive type, like heat resistance vs water resistance, while mitigating their weaknesses.

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Two-component curing adhesive composition for laminating films and packaging materials that is safer, recyclable, and biodegradable compared to traditional reactive adhesives. The adhesive uses an oil or fat containing an acid anhydride group as the adhesive component and a curing agent containing an acid-modified polyol and an amine compound. The acid anhydride groups in the oil react with the hydroxyl groups in the polyol to cure the adhesive. The curing agent amine catalyzes the reaction and improves curing speed. The oil component allows recyclability and biodegradability compared to traditional reactive adhesives.

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Packaging film for bags and pouches that has improved anti-blocking properties to prevent sticking and clogging. The film has one surface with a roughness of 1-10 microns due to blending iron powder into the propylene resin. This roughness reduces friction and prevents sticking compared to smooth surfaces. The iron powder also absorbs oxygen to improve barrier properties. The rough surface can be formed by blending iron powder into the resin at 1-40% mass.

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Sealant film for packaging applications that enables recycling of mixed resin materials. The film has a layer containing recycled material with two or more resin types, followed by a separate sealant layer. The recycled layer has small, localized regions with lower transmission compared to the surrounding. These regions have maximum area and aspect ratio limits to prevent clumping. This allows recycling mixed resins while maintaining sealant and mechanical properties.

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Coating packaging materials like paper and cardboard with a thixotropic aqueous mixture to improve barrier properties like reducing gas and moisture transfer through the material. The coating composition contains smectite clay, a water-soluble polymer, and a cross-linking agent that links the clay to the polymer. Applying the mixture to a surface and heat treating crosslinks the clay-polymer barrier. This provides coated packaging with improved barrier properties for replacing single-use plastic in produce shipping.

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Polypropylene-based packaging material with improved drop impact resistance, blocking resistance, slipperiness, and flavor barrier properties for food packaging applications. The packaging material contains an ethylene-propylene block copolymer with a unique phase dispersion structure. The copolymer has a matrix of propylene-based polymer and spindle-shaped domains made of propylene-based elastomer. The spindle shape provides optimal properties like drop impact resistance, blocking resistance, and slipperiness while avoiding issues like poor flavor barrier or appearance.

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Non-oriented film for heat seal packaging applications that balances low-temperature sealing properties and heat seal strength. The film has a sealant layer containing propylene-based polymer (A) with melting point 120-170°C and an optional copolymer (B) with lower melting point. The substrate layer has propylene-based polymer (C) with lower melting point. This composition allows the film to form laminated structures with good low-temp sealability and heat seal strength. The films can be used in mono-material packaging without deteriorating substrate heat resistance.

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Laminate sheet and food packaging container with reduced variation in hiding power when filled with a high percentage of inorganic powder. The laminate sheet has a three-layer structure with an inner layer containing the inorganic powder, and outer layers without the powder. The powder particle size distribution is optimized: D20 2.0-3.4 μm, D50 4.8-7.6 μm, D70 7.7-11.6 μm. The inner layer has higher powder content than the outer layers. The powder content is 40-80% by mass of the laminate sheet. The outer layer thickness ratio is 2-20% of the total sheet thickness. This configuration suppresses hiding power variation when producing sheets with high inorganic powder content.

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Laminated sheet and food packaging container with reduced hiding variation when filled with a high content of inorganic powder. The laminate sheet has a specific particle size distribution for the inorganic powder, with D20 of 2.0-3.4 μm, D50 of 4.8-7.6 μm, and D70 of 7.7-11.6 μm. The inner layer contains more inorganic powder than the outer layers. The thickness ratio of the outer layers is 2-20%. This reduces hiding powder variation during mass production. The laminate sheet can be used for food packaging containers.

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Biaxially stretched polyamide film with improved properties for food packaging and alcohol evaporants. The film has a specific composition and structure to balance properties like bending pinhole resistance, puncture strength, dimensional stability, and ethanol penetration. It contains polyamide 6 as the main component, with dispersed particles of a resin like PBAT, PEE, or POE having a maximum diameter of 1 μm or more. This provides plane alignment and crystallization parameters that enhance performance.

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A multilayer biodegradable film with improved uniformity, flexibility, and noise level compared to existing biodegradable films. The film has alternating layers of a polylactic acid-based polymer and an aliphatic polyester or aliphatic-aromatic copolymerized polyester. The uniformity of the polylactic acid layers is optimized to 0.2 μm or less. This reduces thickness variations between layers. The film has good balance of properties like flexibility, transparency, and noise level compared to films with only polylactic acid layers. It also has better interlayer adhesion and processing.

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A masterbatch for blending PET and PEF resins that enables stable blend molding of PET and PEF without prolonging molding time and achieving fine quality of the resulting molded object. The masterbatch contains a high concentration of PEF as an additive to PET, with specific proportions and intrinsic viscosities. This allows compatibilization of the PET and PEF during processing and avoids quality issues like whitening or strain hardening when blending the resins directly. The masterbatch composition is: PET:PEF ratio of 90:10 mass% or less, and intrinsic viscosity of PEF of 0.50-1.20 dl/g.

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Cushioning materials and packaging materials with improved cushioning performance. The materials contain a polyester resin with a weight-average molecular weight of 20,000 to 50,000 g/mol and a glass transition temperature (Tg) of 30°C to 60°C. The polyester resin is mixed with a crosslinkable component like a crosslinkable polymer or a crosslinking agent, and optionally other components like fillers, pigments, or plasticizers. The resulting material has improved cushioning properties compared to conventional materials.

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Processing dairy bottle recycling into new dairy bottles to enable closed-loop recycling of dairy packaging. The method involves creating new dairy bottles using recycled dairy bottles in the middle layer. The middle layer is made of opaque recycled plastic, like PET, to block light and preserve vitamins. The inner and outer layers are white for contact with the product. This allows using recycled opaque bottles instead of virgin plastic. The opaque recycled material provides sufficient light blocking.

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Sheet for press-through packaging, like for medicine blisters, with improved properties for environmental friendliness and manufacturing ease. The sheet contains vinyl chloride resin, biomass resin, and a plasticizer. It has a specific storage modulus range of 1-2.6 GPa at 30°C. The biomass resin is a butylene succinate like polybutylene succinate. The plasticizer is epoxidized vegetable oil like epoxidized soybean oil. The vinyl chloride resin has low chlorine content. This composition allows manufacturing press-through packages with biomass content over 10% and reduced bleeding of plasticizers during production.

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Packaging film with improved anti-blocking properties for preventing sticking and clogging of filled pouches. The film has at least one surface with a roughness in the range of 1.0 to 10 μm. This roughness is achieved by blending iron powder into the propylene-based resin layer forming that surface. The iron powder not only improves anti-blocking but also provides oxygen barrier properties. Blending iron powder into the resin layer forms a rough surface with a small friction coefficient that prevents sticking.

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Resin composition, film, laminated film, and packaging material with improved balance between easy-opening properties and low-temperature heat sealability. The composition contains 5-30% of a butene polymer, 30-55% high-pressure LDPE, and 30-45% ethylene-α-olefin copolymer with specific properties. The mass ratio of LDPE to copolymer is 40:60 to 59:41. The butene polymer has a melting point of 100-130°C, low melt flow rate, and high proportion of low molecular weight components. The composition provides a film with good easy-opening and low-temp sealability over a wide temperature range.

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Water-soluble film containing gelatin and a modified polyvinyl alcohol resin for use in pharmaceutical packaging. The film dissolves in water to expose the contained drug when submerged. The film has improved properties like water solubility, mechanical strength, and sealing compared to gelatin films. The modified PVA resin is used in combination with gelatin to achieve these properties.

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