Optical Brightening Systems for Enhanced Appearance

Laminate for packaging bags that improves recyclability and concealment of contents. The laminate has a substrate made of stretched or irradiated polyethylene or polypropylene. The substrate and sealant layer are both made of the same polymer. At least one of the substrate or sealant layer contains a white pigment. An intermediate layer between the substrate and sealant can also have the white pigment. This allows concealing contents without reducing bag strength. The pigmented layers improve recyclability compared to using different polymers.

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A packaging material that provides bright white appearance, high light blocking, low additive levels, and uniform color across all viewing angles. The packaging material is a wall composition for containers that contains a polyester, a small amount of oriented polymethylpentene, and a small amount of light scattering pigment. This composition has a synergistic effect when subjected to orientation stress, allowing for reduced amounts of the components compared to traditional opaque packaging. The resulting package walls have high lightness, low color difference across angles, and high light barrier without swirl or pearlescence.

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An aqueous white ink composition for surface-printed flexible packaging that provides improved properties like heat resistance, blocking resistance, alcohol resistance, abrasion resistance, solid uniformity, and bleeding resistance compared to conventional inks. The ink contains a white pigment, an acrylic resin emulsion with a specific glass transition temperature range, N-oleoyl sarcosine, a hydrazine compound with multiple hydrazine groups, and wax. The acrylic resin content is 3-40% by weight and has a glass transition temperature of -40 to 30°C.

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Single-layer opaque plastic bottle with high light protection that achieves nearly complete light occlusion. The bottle is made from a single layer of plastic containing a specific filler composition. The filler is dispersed in the plastic during manufacturing to provide high light blocking without needing multiple layers or coatings. The filler composition includes a white pigment like titanium dioxide (TiO2) along with an additional filler like aluminum (Al) that absorbs light without reflecting it. This combination provides both hiding power and high light absorption to make the bottle nearly opaque.

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Biodegradable packaging made from chitosan, starch, and titanium dioxide nanoparticles for food preservation. The packaging is made by mixing chitosan, starch, and titanium dioxide in a solution, then drying it to form the film. The titanium dioxide provides antimicrobial and antioxidant properties to prevent spoilage and degradation. The biodegradable packaging replaces synthetic plastics and aims to address environmental concerns of non-biodegradable packaging.

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Multilayer film for packaging with improved hiding properties and cold impact resistance. The film has a heat sealing layer containing propylene homopolymer and/or copolymer resin, and a concealing layer with propylene-ethylene block copolymer resin, ethylene-propylene copolymer elastomer, and titanium oxide. The concealing layer contains 0.10-30.00% titanium oxide by mass based on the hiding layer total. This allows the film to have sufficient hiding properties without compromising cold impact resistance.

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Laminated sheet and food packaging container with improved appearance and mechanical properties. The laminate has a three-layer structure with an inner layer containing calcium carbonate particles blended in specific sizes and ratios. The inner layer calcium carbonate has a fine average particle size of 0.7-6 μm and a coarser particle size distribution of 20.1-40 μm. The inner layer also has a calcium carbonate mass fraction of 40-80%. The outer layers are made of thermoplastic resin. This composition and ratio of calcium carbonate sizes in the inner layer provides better appearance and mechanical properties compared to using just fine or coarse calcium carbonate. The outer layers prevent calcium carbonate migration. The laminated sheet is used to make food packaging containers with improved properties.

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White packaging material with high light barrier, brightness, and uniform color appearance across viewing angles. The packaging uses a wall composition containing a polyester, oriented polymethylpentene, and a light scattering pigment. The ratio of polymethylpentene to light scattering pigment is 5:1 to 1:5. The wall is produced by orientation stress. This composition provides a goniochromatic appearance with constant color across angles, high lightness, and excellent light barrier. It allows low pigment levels for whiteness without tradeoffs.

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Packaging material, containers, lids, and labels that prevent bleeding of laser-marked characters and provide good contrast for easier reading. The packaging material has a specific structure and properties to suppress bleeding of laser-marked characters. It is a laminated film with a ground color layer containing titanium dioxide and a binder resin. The ground color layer has a lightness (L*) value of 90 or more in the CIE L*a*b* color system. The interlayer adhesion force between the ground color layer and the layer in contact with it is 0.5 N/15 mm or more. This prevents gaps and voids from forming during laser marking that could cause bleeding.

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Multilayer films, packaging materials, and packages with improved hiding properties while maintaining cold impact resistance. The films have a heat-sealing layer of propylene homopolymer and/or copolymer, and a concealing layer containing propylene-ethylene block copolymer, propylene-ethylene copolymer elastomer, titanium oxide, and propylene-based copolymer. The concealing layer has 0.10-30.00% titanium oxide by mass based on the total concealing layer weight. This allows the films to hide contents while still sealing well at low temperatures. The films can be used in packaging materials and packages as a monomaterial alternative to traditional aluminum-based packaging.

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White packaging material with high light barrier and brightness for light-sensitive products like milk. The packaging has a composition containing a polyester, a small amount of polymethylpentene, and a light scattering pigment. The polymethylpentene and pigment are blended with the polyester and then orientation processed to create a goniochromatic appearance with high lightness and consistency across viewing angles. The small amounts of polymethylpentene and pigment provide light scattering without gonioapparent effects. This allows a bright white appearance with reduced light scattering compared to higher loadings. The composition also has high light blocking properties.

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Laminated packaging material with improved light blocking and whiteness when made into bags. The laminate has a base material, a white printed layer, and a sealant layer with a light-shielding coating. The white printing layer has whiteness of 45-65 (L* value) on the side facing the sealant. This prevents color transfer when contents leak through the sealant. The overall laminate has whiteness of 45-65 on the other side. This balances light blocking (30% transmittance) with sufficient brightness for food packaging.

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Food container packaging film that improves visibility, prevents moisture buildup, and allows easy separation and recycling of the packaging. The film is made of two PET layers laminated together, with a coating on the outer layer. The inner PET layer contacts the food. The coating on the outer layer prevents fogging and moisture buildup. The coating can be a polymer solution containing compounds like ethylene glycol, 1,1,1-trimethylolpropane, 1,4-butanediol, isophthalic acid, terephthalic acid, 2,2-dimethyl-1,3-propanediol, diethylene glycol, alkyl sulfosuccinate, cyclohexyl diesters, 1,2-propanediol, talc, and silicon dioxide.

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Packaging containers like PET bottles that block light to prevent degradation of contents. The containers have a white color and high opacity to shield contents from light. The containers contain a polymer called YY, like cyclic-olefin copolymers (COCs) or polymethylpentene (PMP), along with a polyester like PET. This allows reducing TiO2 content while still achieving high opacity and whiteness. The YY polymer provides opacity and the polyester provides whiteness. The container base and side walls have high whiteness, while the neck may have slightly lower whiteness.

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Packaging containers, like PET bottles, with improved light protection to prevent degradation of the contents during storage. The containers have a preform made with a specific composition of materials, including a cyclic olefin copolymer (COC) or polymethylpentene (PMP) resin, that has a high initial lightness. This preform is blown into the final container shape. The resulting container has a white and opaque body and neck, preventing light from reaching the contents. The key innovation is using a resin with an initial high lightness that does not darken significantly when blown into the final container shape. This avoids the issue of the neck appearing darker than the body due to stretching during blow molding.

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Packaging material that suppresses the visibility of bright spots without using a metal layer. The packaging material includes a layer containing a white pigment, a layer containing metal flakes, and a plastic film in this order from the outer layer side.

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Coated paper for packaging containers that provides high whiteness, gloss, strength, printability, and processability. The paper has a surface layer mostly made of mixed kraft pulp and high-quality waste paper, a lower surface layer of waste paper, and a back layer with a coating. The mixed kraft pulp contains softwood and hardwood kraft with specific ratios. The surface coating contains pigments and adhesive. The coated paper has whiteness ≥75%, gloss 40-50%, and moisture 4-9.5%. It also has intermediate layers of waste paper between the surface and back layers. This composition reduces weight, improves bonding, and suppresses dust generation. The coated paper is suitable for packaging containers.

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Water-based white ink composition for surface printing on flexible packaging that provides excellent heat resistance, blocking resistance, alcohol resistance, abrasion resistance, solid uniformity, and bleeding resistance. The ink contains a white pigment, acrylic resin emulsion, N-oleoyl sarcosine, a hydrazine compound, and wax. The acrylic resin has 3-40% solid content and a glass transition temperature of -40 to 30°C. The ink composition improves ink properties like heat resistance, blocking, alcohol resistance, abrasion resistance, solid uniformity, and bleeding resistance compared to conventional white inks for flexible packaging.

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Water-based white ink composition for surface printing flexible packaging that provides improved heat resistance, blocking resistance, alcohol resistance, abrasion resistance, solid uniformity and bleeding resistance compared to conventional inks. The ink contains a white pigment, an acrylic resin emulsion with a polymer, N-oleoyl sarcosine, a hydrazine compound, and wax. The acrylic resin emulsion has 3-40% solids with a glass transition of -40 to 30°C.

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Preforms and containers for packaging consumables like milk that block light to prevent degradation. The containers are made of a PET base with additives to achieve light blocking. The additives include a cyclic olefin copolymer (COC), titanium dioxide, aluminum flakes, and an immiscible polymer. The COC provides high light blockage compared to other additives like HIPS or PP. The container composition is 85-95% PET, 1-5% TiO2, 1-7% COC, 0.01-0.5% aluminum, and 0-1.5% immiscible polymer. This composition achieves high light blockage while keeping the container mostly PET for recyclability.

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