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US 2003/0198882 A1Published application
Toner for electrostatic image development
AssigneeDainippon Ink and Chemicals, Inc.
InventorHideki Gambayashi
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AssigneeDainippon Ink and Chemicals, Inc.
InventorHideki Gambayashi
Estimating the term…
The present invention provides a toner for electrostatic image development which employs a black colorant free from a toxic substance and exhibits stable charge behavior even after extended use or printing of a large number of sheets, thus making it possible to provide printed images having sufficient image density without causing toner dispersion, fogging, and variation in image density. This is a toner for electrostatic image development comprising a binder resin and a colorant, wherein the colorant is made of black fine particles obtained by coating the surface of titanium dioxide particles with a complex oxide of titanium and iron.
A toner for electrostatic image development comprising a binder resin and a colorant, wherein the colorant is made of black fine particles obtained by coating a surface of titanium dioxide particles with a complex oxide of titanium and iron.
Dependencies are inferred from the claim text.
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Colouring agents for toner particles: inorganic compounds
Plasticisers; Charge controlling agents: inorganic compounds
Electrography
Term end not estimated
1. Field of the Invention
The present invention relates to a black toner for electrostatic image development which can provide high-quality images with less surface contamination in an electrostatic image developing apparatus operated at a speed ranging from low to high speed, and which is also free from toxic substances.
2. Description of the Related Art
The following Examples further illustrate the present invention in detail.
However, the present invention is not limited to the following Examples.
Fine black powders comprising titanium dioxide (TiO2: Titanium Dioxide) particles and a complex oxide (Iron Titanium spinel) having a spinel structure represented by Fe2TiO4 formed on the surface of the titanium dioxide particles.