Photocurable Inkjet Primer Ink Adhesion

The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the homopolymer of the monofunctional ethylenically unsaturated monomer to be below 25°C. This temperature parameter control ensures the primer layer remains flexible and adhesive at room temperature while maintaining low viscosity for discharge stability. Additionally, the content ratio of monofunctional monomer (76-95 parts) to bifunctional oligomer (5-24 parts) is optimized to balance viscosity reduction with adhesion maintenance.

The patent uses composite materials by combining monofunctional ethylenically unsaturated monomers with specific Tg characteristics and bifunctional ethylenically unsaturated oligomers in defined ratios. This composite approach allows the low-viscosity monomer to provide discharge stability while the oligomer contributes to adhesion and crosslinking, creating a synergistic effect that resolves the contradiction between low viscosity and high adhesion.

The patent controls the glass transition temperature parameter of the monofunctional monomer's homopolymer to be below 25°C. This parameter control prevents excessive tackiness by ensuring the polymer chains remain mobile but not too sticky at room temperature, while still allowing low viscosity for discharge stability. The Tg acts as a critical threshold parameter that balances these opposing requirements.

The patent applies local quality by having different functional components serve different purposes: the monofunctional monomer with low Tg homopolymer provides local flexibility and adhesion at the substrate interface, while the bifunctional oligomer provides local crosslinking density to reduce overall tackiness. This spatial and functional differentiation resolves the contradiction between low viscosity and anti-tackiness.