Two-Component Coating Composition with Bimodal Polyacrylate

The patent applies parameter changes by modifying the particle size distribution of the polyacrylate component to bimodal or higher-modal distribution with specific weight ratios between small and large particles. This structural parameter change optimizes the interaction with water-emulsifiable polyisocyanate, improving drying behavior and film formation while maintaining aqueous applicability. The specific particle size parameters (Dw values and weight ratios) are carefully controlled to achieve optimal performance.

The patent employs composite materials by creating a two-component system where a water-emulsifiable polyisocyanate (with specific hydrophilic modification) is combined with a polyacrylate dispersion having bimodal particle size distribution. This composite formulation achieves superior film gloss and optical properties through optimized interfacial interactions and phase distribution, while the components themselves remain relatively simple to manufacture and formulate.

The patent uses hydrophilic compounds as intermediaries to modify the polyisocyanate, enabling it to emulsify in water without sacrificing reactivity. The hydrophilic modification acts as a mediator that maintains compatibility and homogeneity in the aqueous coating composition while preserving the crosslinking functionality. This intermediary approach allows high crosslinking efficiency to be achieved without compromising mixing and stirring behavior.