Multi-layer PET bottle with low light transmittance

Through the multi-layer bottle structure design and the combination of light-shielding additives and polyester polymers, the contradiction between the light barrier and oxygen barrier properties of existing bottles and their recyclability is resolved, and a dairy product or carbonated soft drink container with low light transmittance and high light-shielding degree is achieved, thereby improving recyclability.

CN120659710APending Publication Date: 2025-09-16THE COCA COLA CO
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Patent Information

Application Number
CN202480011340.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-02-10
Filing Date
2024-02-07
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

Existing dairy or beverage bottles have difficulty in meeting both light barrier and oxygen barrier properties while also being recyclable, especially because they contain inorganic pigments or colorants, which affect the ease of recycling.

Method used

It adopts a multi-layer bottle structure, in which the core layer contains a light-shielding additive and a polyester polymer, and the inner and outer layers respectively contain polyester polymers. By controlling the transmittance and ash content, low light transmittance and high light-shielding degree are achieved. At the same time, it does not contain inorganic pigments or colorants and is suitable for dairy products or carbonated soft drink containers.

Benefits of technology

The recyclability of the bottle is improved, the light transmittance and ash content are reduced, and the environmental performance of the bottle is enhanced without affecting the light barrier and oxygen barrier properties.

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Abstract

Disclosed is a multilayer bottle comprising: a core layer having a first side and a second side, the core layer comprising a shading additive and a core polyester polymer, a hydrolyzable polymer, or a combination thereof; an inner layer on a first side of the core layer, the inner layer comprising a first polyester polymer; and an outer layer on a second side of the core layer, the outer layer comprising a second polyester polymer. These multilayer vials have a light transmittance of less than or equal to 1% at a wavelength in the range of 400 to 700 nm and an ash content of less than or equal to 1 wt.%.
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