core shell emulsion polymerization factories

However, small toner sized particles often cause performance difficulties because of the physics associated with the small toner sized particles. The toner compositions typically include small powders having small toner sized particles with a controlled particle shape. The aggregated toner particles are optionally further heated to enable coalescence and fusing, thereby achieving aggregated, fused toner particles.ĭigital printing images are formed using toner compositions with a printer. The colorant dispersion is added to the emulsion latex mixture, and the mixture is aggregated, for example at an elevated temperature, optionally with addition of an aggregating agent or completing agent, to form aggregated toner particles. A colorant dispersion, for example of a pigment dispersed in water, optionally also with additional resin, is separately formed.

Common types of emulsion aggregation toners include emulsion aggregation toners that are acrylate resin based or that are polyester resin based toner particles.Įmulsion aggregation techniques typically involve the formation of an emulsion latex of the resin particles, which particles may be nano-sized from, for example, about 5 to about 500 nanometers in diameter, by heating the resin, optionally with solvent if needed, in water, or by making a latex in water using emulsion polymerization. Toners, such as emulsion aggregation (hereinafter “EA”) toners, are excellent toners to use in forming print and/or xerographic images in that the toners can be made to have uniform sizes and in that the toners are environmentally friendly. The nano-sized composites within the toner particles may be advantageous in improving one or more of elastic modulus, reducing water vapour permeability or additive impaction, raising blocking temperature and vinyl document offset. Incorporating the nano-sized composites into toner particles improves relative humidity (hereinafter “RH”) sensitivity of the toner and charging performance in low and/or high humidity conditions. The nano-sized composites may be incorporated into a bulk or a binder of a toner, such as a conventional toner or an emulsion aggregation toner. The nano-sized composites may have clay platelets orientated in an intercalated, exfoliated or tactoid structure or a dispersion of clay particles within a polymer matrix.

Each nano-sized composite may contain a polymer modified clay that may include, for example, polystyrene, polyester and the like. Disclosed herein are nano-sized composites and a method for making toner particles or developers using these composites.

Core shell emulsion polymerization factories