Bicomponent developer

Abstract

The invention relates to a bicomponent developer, which solves the problems that a conventional bicomponent developer has worse triboelectrification performance and the electrification quantity cannot be too high. The technical scheme of the invention is as follows: the bicomponent developer is at least composed of a toner and a carrier, wherein the toner is formed by adding external additives of0.2-2.0 % by weight of hydrophobic silica and 0.01-1.0% by weight of hydrotalcite-like compounds into coloring particles in which resin particles containing colorants and the resin particles containing waxes are agglutinated and fused; the form factor of the toner is 0.93-0.99; and the carrier is at least formed by applying a silica resin coating on magnetic particles and the average particle diameter of the carrier reaches to 20-100 micrometer. By means of the bicomponent developer provided by the invention, the shortcomings of a bicomponent developer which is composed of a toner formed by utilizing a polymerization method and a carrier formed by a silicon resin coating can be overcome; the good triboelectrification performance can be maintained for a long term; and the high-sharpness images can be maintained for a long term.

Description

technical field [0001] The present invention relates to a two-component developer used in electrophotographic copiers and printers. Specifically, it is related to a two-component developer with excellent performance of high definition and durability. Background technique [0002] In the field of xerography, toners have heretofore been generally mixed with carriers and used as two-component developers. This two-component developer, which charges the toner due to the use of a carrier, is a product that develops the charged toner, and is now widely used as a method of adding charging properties to the toner. [0003] The triboelectric charge between the carrier and the toner will give the toner the necessary charge. That is, the surface of the carrier is designed to have the ability to generate charges having an opposite polarity to that of the toner. The carrier has a magnetic material as its core, and the magnetic material itself may be used alone as a carrier, or a resin ...

AI Technical Summary

Problems solved by technology

However, when using this pulverized toner, there is a problem that carrier contamination cannot be suppressed due to the unique crushing and ultra-fine powder of pulverized toner, which leads to the problem that the charging effect that has been achieved with difficulty cannot be maintained for a long time.

[0009] On the other hand, since silicone resin is generally composed of hydroxymethyl silicone resin, the polar structure of the resin itself makes it difficult to separate.

For this reason, when rubbing against a surface with high uniformity, the polarization effect is small, so the cause of charging is small, and it takes a long time for the triboelectrification process.

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