Oleophobic Grafted Polymers for Printhead Anti-Wetting

The patent applies composite materials by combining fluoroelastomer base polymers with silane crosslinking agents and perfluorinated polyether additives. This creates a multi-component coating system where each component contributes specific properties: the fluoroelastomer provides thermal stability and oleophobicity, the silane crosslinker enhances mechanical robustness through crosslinked network formation, and the perfluorinated polyether maintains low adhesion and self-cleaning properties. The synergistic combination resolves the contradiction between thermal stability and mechanical robustness.

The patent employs parameter changes by modifying the chemical structure and composition of the coating system. Specifically, it uses fluoroelastomers with specific fluorine content and molecular weight ranges, combines them with silane crosslinkers that form thermally stable networks, and incorporates perfluorinated polyethers with controlled chain lengths. These parameter optimizations ensure the coating maintains stability under high-temperature manufacturing conditions while preserving anti-wetting functionality.

The patent applies local quality by creating a coating system with distinct functional zones at the molecular level. The fluoroelastomer matrix provides bulk thermal stability, while the grafted perfluorinated polyether chains create a surface layer with ultra-low surface energy. This hierarchical structure ensures that the bulk material maintains thermal stability while the surface maintains controlled low adhesion properties, preventing ink wetting and drooling.