Optical Brighteners for Package Enhancement

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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Packaging material with high light blocking, brightness, and consistency of color appearance across viewing angles. The material is a blend of a polyester, a small amount of polymethylpentene, and a light scattering pigment. The polymethylpentene and pigment create a phase-separated structure with flattened voids that block light without internal reflections. This avoids the gonio-chromatic effect of overlapping spheres. The polymethylpentene also enhances whiteness. The low pigment loading keeps color consistency.

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Bright white packaging with high light barrier and goniochromatic appearance. The packaging material contains a polyester, a small amount of polymethylpentene, and a light scattering pigment. The ratio of polymethylpentene to light scattering pigment is 5:1 to 1:5. When subjected to orientation stress like blow molding, the material becomes bright white with an L* value over 75. This is achieved by using small amounts of polymethylpentene and light scattering pigment to avoid pearlescence or metallic effects. The material also has high light barrier over 90% for wavelengths 200-1200 nm.

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Packaging with a high lightness value, high light blocking, a low percentage of additives, and a goniochromatic appearance (uniform color across all viewing angles). The packaging is achieved by using a wall composition with a specific ratio of polymethylpentene (PMP), polyester, and light scattering pigment. The wall is subjected to biaxial orientation to create a bright white appearance with reduced additive levels compared to conventional white packaging. The PMP and pigment ratio of 5:1 to 1:5 synergistically improves light barrier and color uniformity. The goniochromatic wall allows consistent color perception from all angles without pearlescence or metallic effects.

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High brightness, light blocking, low pigment content packaging material for light-sensitive products like food and beverages. The material has a goniochromatic appearance that doesn't change color when viewed at different angles. It achieves this by using a small amount of polymethylpentene (0.1-5%), a light scattering pigment (0.1-5%), and a polyester. The ratios of the polymers and pigment create a synergistic effect that eliminates the pearlescent appearance of phase-separated materials. The low pigment content avoids spiral effects and reduces cost compared to opacifiers. The packaging provides high brightness, light barrier, and goniochromaticity.

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Bright white packaging with improved light barrier properties using a combination of polymers and pigments. The packaging walls contain a small amount of polymethylpentene and a light scattering pigment like zinc sulfide. This composition provides a goniochromatic appearance with constant color in different viewing angles and synergistically improved light barrier compared to using just the polymers or pigments alone. The composition allows bright white packaging without swirls or color variations, better light blocking, and reduced light reflection compared to high pigment loads.

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A packaging material with high lightness, high light blocking, low pigment content, and goniochromatic appearance for bright white containers without degrading properties. The packaging wall contains a polyester, a small amount of 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 bright white packaging with high light barrier and consistent color across viewing angles.

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Bright white packaging with high light blocking that prevents degradation of light-sensitive products. The packaging walls contain a combination of polyester, oriented polymethylpentene, and light-scattering pigment in specific weight percentages and ratios. This composition achieves bright white appearance, high light barrier, and goniochromatic uniform color viewing angles without sacrifices like decreased physical properties, recyclability, or reheat performance compared to conventional white packaging methods.

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Packaging material with high whiteness, light blocking, and goniochromatic appearance for light-sensitive products. The packaging uses a wall with a polyester like PET, polymethylpentene, and a light scattering pigment. The specific ratio of polymethylpentene to pigment is about 1:1 to 3:1. This composition provides bright white color without swirl effects, high light barrier, and consistent color viewing angles.

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A packaging material with high whiteness, light blocking, and goniochromatic appearance. The packaging has walls made by blending a polyester, polymethylpentene, and a light scattering pigment. The ratio of polymethylpentene to light scattering pigment is 5:1 to 1:5. This composition creates bright white packages with high lightness and light barrier after orientation processing. The goniochromatic appearance means consistent color across all viewing angles without pearlescent or metallic effects. The composition allows reducing pigment loading compared to opacifiers for whiteness.

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Bright white packaging with high light blocking and goniochromatic appearance. The packaging material contains a small amount of polymethylpentene (0.1-5%), a light scattering pigment (0.1-5%), and a polyester. The ratio of polymethylpentene to light scattering pigment is 5:1 to 1:5. This composition, when subjected to orientation stress like blow molding, creates a goniochromatic appearance with uniform color across all viewing angles. The packaging is bright white (L*>75) and has high light barrier (>90% for 200-1200 nm).

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Water-soluble laundry detergent pouch with improved whiteness and visual differentiation between compartments. The pouch has at least one compartment containing a detergent composition with a high L value (>70) and low b value (<4) from an opacifier and antioxidant. The high L value provides a white appearance. The visual contrast between this compartment and others containing colored detergents improves consumer acceptance of the multi-compartment pouches. The opacifier prevents yellowing during storage.

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Clear packaging containers made from modified polypropylene that has improved optical properties like gloss compared to traditional polypropylene. The modification involves blending a clarifying agent containing nonitol into the polypropylene made from a metallocene catalyst. This results in a clarified polypropylene that can be thermoformed into containers with significantly lower haze and higher gloss compared to Ziegler-Natta polypropylene blended with the same clarifying agent.

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