Boric Acid Toner Composition for Low-Temperature Fixing

The patent uses a copolymer binder resin combining vinyl-based crystalline resin segments with amorphous resin segments. This composite structure allows the crystalline segments to provide low-temperature fixability through their sharp melt property, while the amorphous segments contribute to overall stability and processability, resolving the contradiction between achieving low fixing temperature and maintaining sufficient crystallinity

The patent applies local quality by creating specific crystalline regions within the amorphous binder resin matrix. The vinyl-based crystalline resin forms localized crystalline domains that provide sharp melt behavior at low temperatures for fixing, while the surrounding amorphous matrix maintains general stability and prevents excessive crystallization that would harm storage properties

The patent exploits phase transitions by utilizing the sharp melt point of crystalline vinyl-based resin segments. These segments undergo a first-order phase transition (melting) at a specific temperature that is lower than conventional binders, enabling low-temperature fixing. The crystalline structure provides a defined melting behavior that allows low-temperature processing while maintaining stability below this melting point

The copolymer structure combines segments with different thermal behaviors: the vinyl-based crystalline segments provide low-temperature melting for fixing, while the amorphous segments provide gradual transition and stability. This composite approach allows the binder to exhibit both low-temperature fixability and heat-resistant storage stability that cannot be achieved with single-phase binders