Toners for electrostatic-image development

摘要

To provide an emulsion polymerized agglomerated toner for electrostatic charge image which is excellent in the fixing property even at a high temperature without deteriorating other properties and which does not emit an odor offensive to people, and a process for its production.;An emulsion polymerized agglomerated toner characterized in that the odor index of aliphatic aldehydes measured by gas chromatography is at most 300, and an emulsion polymerized agglomerated toner which is an emulsion polymerized agglomerated toner obtainable via a polymerization step, a flocculation step and an aging step, characterized in that an emulsion polymerized latex before the flocculation step is a latex having a peroxide value of at most 30.

主权项

1. A method for making an emulsion polymerized agglomerated toner comprising a crosslinked styrene resin binder, the method comprising
(1) polymerization, which is carried out by seed polymerization in the presence of a dispersion of a wax in the form of particles having an average diameter of from 0.01 μm to 3 μm and a redox initiator, wherein the wax is at least one member selected from the group consisting of an olefin wax, an ester wax having a long chain alkyl group, a ketone having a long chain alkyl group, and a long chain aliphatic alcohol, thereby forming a latex of primary particles comprising said crosslinked styrene resin and said wax, (2) mixing said latex of primary particles and a dispersion of colorant particles, thereby forming an emulsion polymerized latex having a peroxide value of at most 30, (3) flocculating primary particles of the emulsion polymerized latex thereby forming agglomerates of primary particles, (4) fusing the primary particles of the agglomerates to one another, and (5) washing and drying the fused agglomerates, thereby forming said toner, the toner having a volume average particle diameter of from 3 to 8 μm, and wherein an odor index as calculated from the contents of aliphatic aldehydes in the toner measured by gas chromatography and the odor threshold values of the aliphatic aldehydes, is at most 300.