Toner for the development of electrostatic image and the production process thereof
AssigneeMitsubishi Chemical Corporation
InventorsTomoko Ishikawa, Yuqing Xu, Katsuo Koizumi, Noriaki Takahashi, Osamu Ando
Life of this patent
Estimating the term…
Abstract
A toner for the development of an electrostatic image is provided wherein at least one layer of a particulate resin is coated onto a substantial portion of the surface of an agglomerate of particles made from at least primary polymer particles and primary colorant particles, wherein at least one of the primary polymer particles and the particulate resin contains a wax, and the particulate resin of the outermost layer is substantially free of wax and a process for producing the toner.
Claims56
A toner, comprising:
- an agglomerate of particles comprising at least primary polymer particles and primary colorant particles, and at least one layer of a particulate resin coated on a substantial surface portion of said agglomerate of particles,
- wherein at least one of said primary polymer particles and said particulate resin further comprises a wax, and wherein an outermost layer of said particulate resin is substantially free of wax.
A toner comprising:
- a binder resin and a particulate wax, wherein the toner has a volume-average particle diameter of from 3 to 12 μm, and a half value width of a number-average particle diameter of particulate wax contained therein, when a cross section of the toner is observed, of 0.06 μm or less, and wherein a distribution of particulate wax having an average particle diameter of 0.01 μm or more throughout the toner particle satisfies the following equation:
- (A/B)/(C/D)≦0.1
- wherein A is total area of wax particles contained in an outermost layer of the toner particle to a depth of 0.1 μm;
- B is total area of said outermost layer of the toner particle;
- C is total area of wax particles contained in a remainder of the toner (at a depth of greater than 0.1 μm from the surface of the toner particle);
- and
- D is total area of said remainder of the toner particle,
- wherein all areas are measured as observed in a cross section of said toner through a center point of said toner.
A process for producing a toner comprising:
- agglomerating at least primary polymer particles and primary colorant particles to form an agglomerate of particles, then coating at least a substantial surface portion of said agglomerate of particles with at least one layer of a particulate resin, wherein the primary polymer particles are obtained by seed emulsion polymerization of a monomer mixture in the presence of a particulate wax, and an outermost layer of the particulate resin is substantially free of wax.
Dependencies are inferred from the claim text.