TONER PARTICLES CONTAINING POLYESTER AND STYRENE ACRYLATE POLYMERS, WITH SHELL FROM POLYESTER Russian patent published in 2019 - IPC G03G9/113 

FIELD: physics.

SUBSTANCE: present description relates generally to hybrid toner particles and methods for production thereof for use in making toners. More specifically, the present disclosure relates to hybrid latex particles having a core of polyesters and styrene-acrylate polymers with a coating consisting essentially of styrene acrylate polymer, as well as methods for producing said toners for use in making toners. Disclosed group of inventions includes a method of producing toner, a toner composition and a method of producing a toner composition. Method of producing toner comprises initial aggregation of at least one polyester latex and at least one styrene acrylate latex, and optionally a wax dispersion, and optionally a pigment dispersion to obtain a core, where the styrene acrylate latex particles are aggregated on the core to form a shell, and where the obtained aggregated particles are further subjected to a continuous coalescence process involving: aggregated particles heating to the first temperature higher than their vitrification temperature in the first heat exchanger to produce coalesced particles, cooling coalesced particles to a second temperature below the glass transition temperature after a certain holding time and separating the cooled coalesced particles at the outlet, where the aggregated particles roundness is from about 0.900 to about 0.940, and the particles in the coalesced particles suspension roundness is increased to a value from about 0.940 to about 0.999, and where the obtained toner additionally contains a hybrid composition with styrene/acrylate and polyester.

EFFECT: technical result consists in providing hybrid toner particles and methods for production thereof for use in high-speed printing toners, particularly high-speed single-color printing, which provide excellent flow, charge, low consumption of toner and reduced contamination of the drum, as well as in production of toner, which preserves good sintering characteristics and low dielectric losses, as well as in improved surface morphology excluding fluctuations of fusion between polyester and styrene acrylate on surface.

10 cl, 5 dwg, 3 tbl