Core-shell liquid developer toner for heat-resistant stability

The patent applies the nested doll principle by creating a core-shell structure where second resin particles (core) containing pigment and dispersant are coated with first resin particles (shell). The shell encapsulates the core, preventing the dispersant from eluting into the insulating liquid while maintaining pigment dispersion. This nested structure resolves the contradiction by containing the harmful dispersant within the core while preserving its dispersing function.

The patent uses a resin shell (first resin particles) to encapsulate the core containing dispersant. This shell acts as a barrier that prevents the dispersant from migrating into the insulating liquid while allowing the toner particles to maintain their functional properties. The shell structure provides physical containment that solves the elution problem.

The patent segments the toner particle into distinct functional zones: a core region (second resin particles) containing pigment and dispersant, and a shell region (first resin particles) providing protective and functional properties. This segmentation allows each region to be optimized for its specific function, enabling simultaneous achievement of fixability and heat-resistant storage stability.

The patent creates a composite toner particle structure combining first resin particles and second resin particles with different functional properties. The composite structure integrates the dispersing capability of the core with the protective and fixing properties of the shell, achieving multiple performance requirements that cannot be met by a single homogeneous material.