Toner, toner storage unit, image forming apparatus, and image forming method

Abstract

An object of the present invention is to provide a toner having low-temperature fixability, crushability, chargeability, adhesion resistance to copy, stress resistance, and resistance to filming, low cost, and high environmental safety.The toner contains at least a binder resin and has a maximum peak height W from a spectrum of the bisphenol A skeleton in a range of 1480 to 1520 cm -1 of a toner measured by an ATR method and a peak height W from a carbonyl group of 1700 to 1750 cm -1 (W / R) of the maximum peak height R of the spectrum is 0.20 to 0.70 and the absorption spectrum of the toner measured by the transmission method has a peak A between wavelengths of 350 and 390 nm by using a spectrophotometer Has a main peak in molecular weight distribution measured by GPC of from THF-soluble components in the toner, has a main peak, has a half width of a molecular weight distribution of 20,000 or less, a THF-insoluble content of 5-40 mass %..

Description

technical field [0001] The present invention relates to toner, a toner storage unit, an image forming apparatus, and an image forming method. Background technique [0002] Generally, toner used in electrophotographic copiers, printers, etc. is a mixture composed of a binder resin as a main component and various substances such as a colorant, a release agent, and a charge control agent. In the pulverized toner, the above-mentioned raw materials are usually melt-kneaded, and the melt-kneaded product is pulverized and classified to obtain a toner having a desired particle diameter. Among the raw materials constituting the toner, the ratio of the binder resin is usually 80 to 90% by mass, and most of the components in the toner are the binder resin. [0003] Recently, from the viewpoint of reducing power consumption and environmental load in copiers, the binder resin is generally a polyester resin that is easy to fix toner even at a low fixing temperature. In general, polyeste...

AI Technical Summary

Problems solved by technology

However, in this method, even if the low-temperature fixability and crushability can be improved, since the bisphenol A skeleton is reduced, there is a concern that the stress caused by the toner when it is stirred in a developing device, etc., may cause deterioration, etc. Stress resistance (durability) Deterioration, or contamination of electrostatic latent image carriers (hereinafter also referred to as photoreceptors) and other components such as deterioration of conjunctival resistance

In addition, since the bisphenol A skeleton decreases, the chargeability of the resin decreases, or the hygroscopicity increases, so there is concern that the chargeability of the toner will decrease, background staining will worsen, and the toner will scatter.

That is, in this method, it is not sufficient to achieve excellent fixability, crushability, chargeability, stress resistance, conjunctival resistance, and blocking resistance.

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