Electrostatic latent image developing toner and image forming method

Abstract

Electrostatic latent image developing toner capable of providing a sufficient image density and being free from incorrect transferring even when a toner consumption speed is high, or an insufficient toner charge amount or a non-uniform charge amount distribution is likely to occur. Electrostatic latent image developing toner containing coloring particles including colorant and binding resin, wherein the work function X(eV) of the toner in work function measuring and the gradient A of standardized photoelectron yield (standardized photoelectron yield / exciting energy) (1 / eV) with respect to exciting energy are within ranges, 5.350.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic latent image (hereinafter simply referred to as "toner") for developing an electrostatic latent image in electrophotography, electrostatic recording, electrostatic printing, magnetic recording, etc. or magnetic latent images and other latent images having electrostatic properties. More specifically, the present invention relates to a toner for developing electrostatic latent images that can obtain sufficient image density and prevent transfer failure. [0002] The present invention also relates to an image forming method using the above toner for developing an electrostatic latent image. Background technique [0003] The electrophotography method refers to the electrostatic latent image formed on the photoreceptor is developed with an electrostatic latent image developer and toner, and then transferred to a recording material such as paper or OHP sheet, and then the transferred to...

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Problems solved by technology

[0006] On the other hand, when the amount of toner charge or the distribution of charge amount is inappropriate, for example, the amount of toner developed is too small, the image density is insufficient or density deviation occurs, or the portion of the photoreceptor that should not be developed by the toner Toner development occurs, resulting in blurring of background color contamination of printed matter

[0007] Especially printing that consumes a large amount of toner in a short period of time, such as high-speed mass printing or continuous full-scale (full pattern) printing, or just after the electrostatic latent image developing system has started operating or new toner has just been replenished. In the early stage of printing after the latent image developing system, the triboelectric charging speed of the toner cannot keep up with the consumption speed of the toner, so the above-mentioned insufficient charge amount or uneven charge amount distribution are prone to image development such as insufficient image density, density deviation, and blurring. bad question

[0008] Patent Document 1 describes that by controlling the work function difference between the four color toners to 0.5 in consideration of the balance of charging physical properties of magenta toner, cyan toner, yellow toner and black toner, eV or below can improve the color reproducibility of full-color images. However, no special consideration has been given to solving problems such as insufficient density, density deviation, and blurring of images that occur when the toner consumption rate is high or at the beginning of printing.

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