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

Abstract

An object of the present invention is to provide a toner that is excellent in low-temperature fixability, crushability, chargeability, copy-blocking resistance, stress resistance, and conjunctival resistance, is low-cost, and is highly environmentally safe. It contains at least a binding resin, and the toner is 1480 to 1520cm measured by FT-IR and ATR method. ‑1 The maximum peak height W of the spectrum derived from the bisphenol A skeleton is between 1700 and 1750cm ‑1 The maximum peak height R of the spectrum derived from the carbonyl group and the peak ratio (W / R) are 0.20 to 0.70. The absorption spectrum of the toner measured by the transmission method using a spectrophotometer has a peak A between the wavelength of 350 and 390 nm. , the molecular weight distribution measured by GPC determined from the THF-soluble components in the toner is between 1,000 and 10,000, has a main peak, the half-width of the molecular weight distribution is a molecular weight of 20,000 or less, and contains 5 to 40 mass of THF-insoluble components. %.

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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