TONER AND METHOD OF MANUFACTURE OF TONER Russian patent published in 2018 - IPC G03G9/08 G03G9/87 

FIELD: physics.

SUBSTANCE: invention relates to toners used for developing an electrostatic image in electrophotography, electrostatic recording, or electrostatic printing. Toner comprising a binder resin and an antiadhesive agent is provided, wherein the amount of the release agent is 1% to 8% by weight relative to the toner, expressed as the equivalent weight of the endothermic amount of the release agent determined by differential scanning calorimetry (DSC), the amount of release agent present in the region of the toner surface to a depth of 0.3 mcm is from 0.1 wt% to 4 wt%, as determined by Fourier Transform Infrared Absorption Spectroscopy of Attenuation Total Reflectance (FTIR-ATR), and the ratio WDa <WDb <WDc, where WDa is the number average particle diameter of the release agent in the region Aa, which is the area of the toner surface to a depth that is one sixth of the toner d diameter (1/6d), is satisfied in the image of the toner surface picked up by the TEM, WDc is the number average particle diameter of the release agent in the central region Ac, which is a circular region having a centre located in the centre of the toner, and a radius of 1/6d, WDb is the number average particle diameter of the release agent present in the Ab region, which is a different region than Aa or Ac, the toner has the second most common (in number) peak in the range exceeding in 1.21-1.31 times the most common (in terms of number) number of particles (the most common diameter), on the graph of the distribution of the numeric toner particle diameter as a function of the prevalence (by the number) of the toner particles. Method for producing the claimed toner is also provided.

EFFECT: technical result is that the proposed toner exhibits good polarizability and durability, as well as resistance to displacement by improving and maintaining the strength of the toner particles and exhibiting an excellent anti-adhesion effect.

11 cl, 27 dwg, 5 tbl, 12 ex