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Is canned food lined with microplastics that leach? How to find low-microplastic canned food?

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Epoxy resins based on bisphenol A diglycidyl ether (BADGE) have been traditionally used for the inner coating of metal cans due to their excellent properties

. However, in recent years, there has been a shift towards developing new epoxies without using monomers that affect the endocrine system, such as bisphenol A. Companies like Sherwin-Williams have introduced new epoxy coatings like valPure V70, which are safe and perform similarly to BPA-based epoxies

. These new epoxies are already being used in beverage cans in California and aim to replace BPA-containing liners in food cans as well

. Epoxy resins play a crucial role in preserving the contents of food cans by creating a protective layer that separates the food or beverage from the metal of the can, preventing corrosion and maintaining freshness and safety

. Since the 1950s, epoxies have been integral in ensuring a long shelf life for canned goods, allowing consumers to store food for extended periods while preserving taste, texture, and color

. The transition away from BPA-based epoxy linings in cans has led to the adoption of alternative coatings like non-BPA acrylic or polyester epoxies, olefin polymers, and other materials to ensure food safety and meet regulatory standards

. While these alternatives aim to reduce exposure to harmful chemicals like BPA, there are ongoing concerns about the safety and environmental impact of these substitutes. Acrylic resins, polyesters, PVC-based resins, and oleoresins are among the alternatives used in can linings, each with its own set of advantages and potential hazards

. In summary, epoxy resins play a vital role in food can coatings by protecting the contents from metal corrosion and ensuring long shelf life. The industry is moving towards safer alternatives to traditional BPA-based epoxies to enhance consumer safety and address environmental concerns.



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Acrylic resins are polymeric materials containing acrylic monomers such as acrylic acid, methacrylic acid, and acrylate monomers like butyl acrylate and methacrylate monomers such as methyl methacrylate[1][2]. These resins can be in solution, dispersion, or solid form and are known for their good chemical and photochemical resistance[2]. Acrylic resins can be categorized into two main types based on their composition:

1. **Pure Acrylic Resins**: These resins contain only acrylic monomers with different functionalizations like carboxyl groups, non-reactive groups, reactive groups, and glycidyl functions that influence the properties and applications of the resin[2].

2. **Complex Acrylic Resins**: Styrene is commonly used in these resins, resulting in Styrene-Acrylic resins. While less expensive than acrylic monomers, they enhance water resistance, alkali resistance, and hardness. However, they may be prone to yellowing and chalking, limiting their applications[2].

Acrylic resins find extensive use in various coatings such as industrial coatings, architectural coatings, powder coatings, and radiation cure coatings due to their versatility and performance characteristics[5]. They are crucial components in paints like latex paint (emulsion paint), offering benefits like better stain protection, water resistance, adhesion, crack resistance, and durability compared to vinyl-based paints[1]. Additionally, acrylic resins are highly weatherproof and durable, making them suitable for outdoor applications where longevity is essential[1].

In summary, acrylic resins are derived from acrylic monomers and offer a wide range of properties that make them valuable in various industries for applications requiring chemical resistance, durability, and weatherproofing capabilities.

[1] https://en.wikipedia.org/wiki/Acrylic_resin
[2] https://coatings.specialchem.com/selection-guide/acrylic-resins
[3] https://www.sciencedirect.com/topics/materials-science/acrylic-resin
[4] https://patents.google.com/patent/US5250596A/en
[5] https://www.ulprospector.com/knowledge/4320/pc-acrylic-resin-fundamentals/



acrylate was one of the NMPs found in the CU study

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