Calcium Carbonate in Packaging Materials

High-strength degradable polylactic acid composite material for packaging applications that provides improved tensile strength compared to regular polylactic acid. The composite contains 60-90 parts polylactic acid, 30-50 parts polybutylene adipate/terephthalate, 0.1-1 part calcium carbonate, and 1-10 parts polyethylene glycol. Adding modified silicon carbide further improves wear resistance but reducing tensile strength. The silicon carbide is modified with lauryl amidopropyl hydroxysulfobetaine and pentaerythritol stearate.

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Biodegradable plastic packaging made from a composition containing calcium carbonate (CaCO3), a polymer like polyethylene, and casein or caseinate as an additive to promote oxidative degradation and biological breakdown. The casein enhances oxidation and embrittlement of the polymer. Adding calcium propionate further reduces mold growth. The CaCO3 provides mineralization potential. The packaging may be produced via irradiation.

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Modified calcium carbonate for filling degradable plastics that improves the strength and durability of degradable plastics without degradation issues. The modified calcium carbonate contains heavy calcium carbonate, a modifier, sodium oleate, dispersant, and solvent. The modifier is a compound called compound I and a second compound II in a specific mass ratio. This modifier strongly bonds with the calcium carbonate particles to improve adhesion to the degradable plastic matrix. The sodium oleate, dispersant, and solvent aid in processing and dispersion.

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Calcium carbonate-filled PLA blend material with improved toughness and elongation compared to plain PLA. The blend contains optimized ratios of PLA, calcium carbonate, modifier, coupling agent, dispersant, antioxidant, lubricant, and calcium stearate. The ingredients are mixed in a specific order using a high-speed mixer followed by twin-screw granulation, water ring granulation, and air-cooling. The blend composition and processing steps enhance the toughness and elongation of the PLA through filling with calcium carbonate and additives.

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A calcium carbonate-based filler composition for polymer materials that reduces costs and improves mechanical properties compared to using all modified calcium carbonate. The filler composition contains a small percentage (2-5%) of epoxy-polyethylene glycol-epoxy modified micron-grade calcium carbonate, along with unmodified micron-grade calcium carbonate (95-98%). This is combined with 2-5% of polyethylene glycol functionalized bis-imidazole ionic liquid modified micron-grade calcium carbonate.

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Method to improve the toughness and strength of polylactic acid (PLA) bioplastic while reducing cost by using modified nanocalcium carbonate and straw fillers. The nanocalcium carbonate is surface modified with sucrose to improve dispersion and compatibility with PLA. The straw filler is also modified for better bonding. A soft toughening agent and coupling agent are added to further enhance properties. The modified fillers, toughening agent, and coupling agent are mixed with PLA to prepare the bioplastic.

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Composite material made of polybutylene adipate terephthalate (PBAT) polymer and modified calcium carbonate filler, prepared by gas-solid fluidization method. The modified calcium carbonate is produced by reacting calcium carbonate, titanic acid, and an ester coupling agent in the presence of a lubricant. The modification improves the composite's mechanical properties compared to unmodified calcium carbonate filler. The gas-solid fluidization method involves atomizing and gasifying the modifiers before coating them onto the calcium carbonate to form the modified filler.

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Preparation of high-filler paper with improved strength and retention compared to conventional high-filler paper. The method involves co-refining cellulose nanofibers and precipitated calcium carbonate filler to form a composite. The nanofibers coat the filler particles and improve retention during papermaking. The composite structure also fills gaps and provides uniformity for dense, low-thickness paper with enhanced mechanical properties.

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Reducing the hygroscopicity of calcium carbonate fillers used in plastics to improve their compatibility and reduce moisture absorption during processing and storage. The method involves treating the calcium carbonate filler with a specific copolymer grinding aid prepared by polymerization. The copolymer has certain molecular weight and polydispersity ranges. Treating the filler with this copolymer during grinding reduces its moisture uptake compared to untreated filler. This allows using higher filler loadings in plastics without issues like agglomeration and improves overall plastic properties.

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Resin composition for food packaging and tableware that has reduced elution of filler particles like calcium carbonate into acidic foods. The composition contains a thermoplastic resin and calcium carbonate filled at a ratio of 50:50 to 10:90. The calcium carbonate particles are surface treated with a phosphate ester like polyoxyethylene lauryl ether phosphate. This surface treatment improves moldability without deteriorating mechanical properties, reduces elution into acids, and prevents void formation between the filler and resin. The treated calcium carbonate has an average particle size of 0.7-6.0 microns.

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Degradable sheet material for disposable containers like coffee cups that breaks down after use. The material contains 30-80% calcium carbonate, a polymer, and an additive like a carboxylic acid. The calcium carbonate makes the material cheap and biodegradable. The carboxylic acid catalyzes decomposition. The material degrades after use due to heat from contents or microwaving.

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PVC resin composition for foamable PVC products with reduced density compared to conventional compositions. The composition contains a filler composition with a specific mix of surface-reacted calcium carbonate and/or hydromagnesite along with a second filler like ground calcium carbonate or precipitated calcium carbonate. The surface-reacted filler reduces foam density versus traditional fillers. The composition also includes a blowing agent, PVC resin, and optional additives. The foamable composition is prepared by extrusion and foaming techniques to create low-density PVC foam products.

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A polyethylene-based resin composition, packaging material, and production method that reduce the amount of resin needed while maintaining formability, strength, and secondary properties compared to using just calcium carbonate filler. The composition contains calcium carbonate blended with polyethylene, where at least some of the calcium carbonate comes from an ethylene-vinyl acetate (EVA) masterbatch. The EVA-derived calcium carbonate has an average particle size of 0.1-5 μm and makes up 30% or more of the total calcium carbonate content in the polyethylene resin composition. This composition can be used in packaging materials like bags. The production method involves mixing the EVA-derived calcium carbonate pellets with polyethylene resin.

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Resin composition for food packaging containers and tableware with improved physical properties like strength, texture, and elution resistance compared to calcium carbonate-filled thermoplastics. The composition contains a thermoplastic resin and calcium carbonate surface-treated with a sulfonic acid-containing surface treatment agent. The calcium carbonate has an average particle size of 0.7-6.0 µm, and the composition has 50-100 parts calcium carbonate by mass relative to the thermoplastic. The surface treatment reduces void formation, improves moldability, and reduces elution compared to untreated calcium carbonate.

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Reducing hygroscopicity of calcium carbonate fillers for plastics by treating them with a specific type of partially neutralized homopolymer during grinding. The hygroscopicity reduction enables better storage and processing of calcium carbonate fillers in plastic polymer materials. The method involves grinding calcium carbonate in an aqueous suspension containing a partially neutralized homopolymer like acrylic acid. The partially neutralized homopolymer reduces moisture absorption by the calcium carbonate during grinding and processing. It can be partially neutralized with sodium ions to at least 80 mol%. The partially neutralized homopolymer is added at 0.05-0.5% by weight relative to the calcium carbonate.

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A biodegradable packaging material that combines polyvinyl alcohol (PVA), starch, modified nano-calcium carbonate, lignin, dispersant, and plasticizer. The material has enhanced mechanical strength and thermal stability compared to PVA-based biodegradable packaging due to the addition of modified nano-calcium carbonate and lignin. The modified nano-calcium carbonate improves strength by dispersing better in the polymer matrix. The lignin provides thermal stability. The biodegradable packaging is made by mixing and extruding the components.

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An environmentally friendly packaging material that is biodegradable and compostable, made from a specific formula of polymer, fillers, and additives. The packaging material is prepared by combining a raw material carrier like polypropylene or PLA with functional fillers like ultra-fine wood or bamboo powder, calcium carbonate, and glass beads. This mixture is processed into sheets for packaging applications. The fillers provide mechanical strength, water resistance, and compostability, while the polymer provides flexibility and printability. The compostable fillers allow the packaging to break down in composting conditions.

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Resin composition and method for producing biodegradable resin molded products that suppresses hydrolysis of biodegradable resins during molding when using resin compositions with high water content. The composition contains a biodegradable resin and heavy calcium carbonate particles in a specific mass ratio, along with calcium oxide and water. The carbonate particles size, surface area, roundness, and oxidation level are also controlled. This composition suppresses biodegradable resin hydrolysis during molding even with high water content. The molded products can be biodegradable, laminates, or containers.

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A cellulose hybrid filler-reinforced polymer composite material made from agricultural and forestry waste like straw and bagasse, along with calcium carbonate waste from artificial granite, to improve composite properties without solvents or surfactants. The fillers are prepared by multi-stage shearing milling to micro-nano fibrillate the cellulose. This fibrillation assists stripping and increases interface interaction with the polymer matrix. The calcium carbonate waste also provides oxygen-containing groups and hydrogen bonding to further enhance dispersion and properties.

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Molding resin composition, molding method, and molded products using biological calcium carbonate powder derived from shells and eggshells instead of synthetic calcium carbonate. The composition contains a thermosetting resin as binder and the biological calcium carbonate. The calcium carbonate derived from living organisms improves moldability and reduces environmental impact compared to synthetic calcium carbonate. The molding method involves compression molding the resin composition. The molded products are tableware, utensils, cutting boards, etc. A coating layer can be added on the surface of molded products that contact food to prevent reaction with acids. The biological calcium carbonate reduces environmental load compared to synthetic calcium carbonate by utilizing waste shells and eggshells instead of incineration.

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