Aqueous dispersions of particles, film-forming compositions and multi-layer coated substrates prepared therefrom, and methods of improving adhesion / cohesion of coating layers in multi-layer coated substrates

Aqueous dispersions of core-shell particles are used to create waterborne film-forming compositions that address adhesion and cohesion issues in multilayer coatings, resulting in improved performance and durability of automotive coatings.

WO2025064081A1 Publication Date: 2025-03-27PPG INDUSTRIES OHIO INC
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Patent Information

Application Number
PCT/US2024/042002
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-09-22
Filing Date
2024-08-13
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

In the automotive industry, multilayer coating stacks often experience compromised intercoat adhesion between layers and/or cohesion of one or more layers, particularly when different solventborne and aqueous coating media are used, and newer low VOC sealant compositions containing alkylphthalates can negatively impact adhesion properties.

Method used

The use of aqueous dispersions of particles with a core-shell morphology, where the core comprises a (meth)acrylic functional polymer and the shell comprises a polyurethane polymer prepared from a polyurethane prepolymer, to create waterborne, curable film-forming compositions that improve adhesion between coating layers and enhance cohesion within the basecoat layer.

Benefits of technology

The described solution significantly improves the adhesive properties between the basecoat and subsequent coating layers, as well as the cohesive properties within the basecoat layer, leading to enhanced durability and performance of multilayer coated substrates.

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Abstract

The present disclosure provides aqueous dispersions of hydroxyl functional core-shell particles. The particle core comprises a (meth)acrylic polymer and the shell comprises a polyurethane polymer. The mass ratio of the core to the shell ranges from 20:80 to 80:20. The shell has a hydroxyl value of 1 to 40 mg KOH / g and an acid value of 10 to 60 mg KOH / g. The polyurethane is prepared from: (a) a first prepolymer having a polymerizable ethylenically unsaturated group at one end and an active hydrogen-functional group at an opposite end thereof; (b) a second prepolymer having a polymerizable ethylenically unsaturated group at each end thereof; and (c) a third prepolymer having an active hydrogen-functional group at each end thereof. Also provided are waterborne curable film-forming compositions, multilayer coated substrates, and methods of improving adhesion between and / or cohesion of coating layers on a substrate.
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