Polyurethane Binder Dispersion for Inkjet Abrasion Resistance

The patent changes the chemical parameters of the polyurethane binder by incorporating specific components: polyisocyanate (20-45 wt%), polyols (10-70 wt%), carboxylic acid functional groups (1-10 wt%), and sulfonic/sulfonate compounds (1-20 wt%). This parameter modification allows the binder to achieve both low viscosity for good mechability and high crosslinking density for improved abrasion resistance, resolving the contradiction between printability and durability.

The patent creates a composite polyurethane binder system combining multiple components: polyisocyanate, polyols, carboxylic acid functional groups, and sulfonic/sulfonate compounds. This composite approach enables synergistic effects where the polyisocyanate provides crosslinking, the polyols provide flexibility, the carboxylic acid groups enhance adhesion, and the sulfonic groups improve dispersibility and durability, achieving both mechability and abrasion resistance simultaneously.

The patent optimizes the concentration parameters of individual components within the polyurethane binder system. By controlling polyisocyanate at 20-45 wt%, polyols at 10-70 wt%, carboxylic acid functional groups at 1-10 wt%, and sulfonic/sulfonate compounds at 1-20 wt%, the formulation achieves the right balance between crosslinking density for durability and molecular flexibility for mechability, allowing the binder to withstand both abrasion and media roller stress.

The composite polyurethane binder combines materials with complementary properties: polyisocyanate for crosslinking and durability, polyols for flexibility and mechability, carboxylic acid functional groups for adhesion, and sulfonic/sulfonate compounds for dispersibility. This composite structure creates a binder that simultaneously provides abrasion resistance and mechability by leveraging the strengths of each component.

The patent modifies the chemical composition parameters of the polyurethane binder by incorporating specific functional groups and compounds at optimized concentrations. The carboxylic acid functional groups (1-10 wt%) and sulfonic/sulfonate compounds (1-20 wt%) enhance the binder's interaction with ink vehicles and media, improving image quality while the polyisocyanate (20-45 wt%) and polyols (10-70 wt%) provide the necessary crosslinking for durability, thus resolving the contradiction between durability and image quality.

The composite polyurethane binder system integrates multiple functional components that work synergistically: polyisocyanate for crosslinking and durability, polyols for flexibility, carboxylic acid functional groups for adhesion to media, and sulfonic/sulfonate compounds for dispersibility and ink vehicle interaction. This composite structure enables the binder to maintain printed image quality while providing enhanced abrasion resistance through the combined effects of all components.