Aqueous coating composition comprising a dispersed acrylic copolymer

The aqueous coating composition, featuring a dispersed styrene-free acrylic copolymer from a two-stage polymerization process, addresses the challenges of softness, low chemical resistance, and aromatic monomer content in existing coatings, achieving high flexibility and hardness for food and beverage packaging.

WO2025056403A1 Publication Date: 2025-03-20AKZO NOBEL COATINGS INT BV
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Patent Information

Application Number
PCT/EP2024/074746
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-12
Filing Date
2024-09-04
Publication Date
2025-03-20

AI Technical Summary

Technical Problem

Existing acrylic-based can coatings for food and beverage packaging are soft, have low chemical resistance, and often contain styrene or other aromatic monomers, which are undesirable due to health concerns and flavor scalping issues.

Method used

Aqueous coating composition comprising a dispersed styrene-free acrylic copolymer obtained through a two-stage polymerization process, using specific (meth)acrylic monomers such as methacrylic acid, methyl methacrylate, and ethyl acrylate, to achieve high hardness, flexibility, and adhesion to metal substrates.

Benefits of technology

The coating composition provides a balance of high flexibility and hardness, ensuring effective adhesion to metal substrates and resistance to chemical and thermal stresses, while being free of styrene and other aromatic monomers.

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Abstract

An aqueous coating composition comprising a dispersed acrylic copolymer obtained by emulsion polymerization of an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of an emulsifying polymer, wherein the aqueous dispersion of the emulsifying polymer is obtained by solution polymerizing a styrene-free first monomer mixture of 5 to 20 wt.% methacrylic acid, at least 15 wt.% methyl methacrylate, and optionally a further ethylenically unsaturated monomer; at least partially neutralizing the thus-obtained acid- functional polymer; and dispersing the neutralized polymer in water, wherein the ethylenically unsaturated monomer component is styrene-free and comprises methyl methacrylate in an amount of at most 45 wt.%, at least 47 wt.%, ethyl acrylate, and, optionally, glycidyl methacrylate, in an amount of at most 8.0 wt.%. A method to coat a metal can, a part of it, or a metal substrate for it with such coating composition and an article coated with such coating composition.
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