Resin coated carrier and two-component developer

Abstract

The invention relates to a resin-coated carrier and a double-component developing agent. The problem that the picture quality of an image is low due to a fact that a color matching agent and an external additive are attached to and stacked on the surface of a carrier coating layer during long-term use of an existing resin-coated carrier is solved. The carrier comprises a magnetic core material and a coating layer covering the magnetic core material, wherein the coating layer comprises adhesive resin, conductive particles and an ester compound represented by a general formula (A). The carrier disclosed by the invention is high in particle flowability, and the color matching agent is endowed with a stable charge quantity; even if the developing agent disclosed by the invention is used for a long time, a desired image density can be still stably retained, and the degradation of the picture quality of the image is suppressed.

Description

technical field [0001] The present invention relates to a resin-coated carrier that can be used in the field of electrostatic charge image development, and a two-component developer containing the resin-coated carrier. Background technique [0002] The two-component developer has the characteristics of good controllability, stable toner charge amount, and easy acquisition of high-quality images due to the separation of carrier and toner functions. The carrier of the two-component developer includes a magnetic carrier without a coating layer and a resin-coated carrier with a coating layer. The long-term continuous friction between the non-coated magnetic carrier and the toner will generate heat, which will easily cause the toner to melt and adhere to the surface of the carrier, resulting in the failure of the toner. Therefore, the resin-coated carrier coated with resin on the surface of the carrier core material becomes The mainstream of the carrier. [0003] The carrier ha...

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Problems solved by technology

[0007] Although the resin-coated carriers disclosed in the above-mentioned patent documents 1 to 3 change the type of the coating layer composition, limit the additive and the amount used in the carrier core material to a specific range and use a resin coating layer with a cycloalkyl group, the change in the amount of charge is suppressed, and the improvement is improved. The carrier gives the toner a stable charge, but the toner and external additives will adhere to the surface of the carrier coating layer during long-term use, causing carrier contamination and image quality degradation

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