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Toner

A technology of toner and crystalline resin, applied in the field of toner, which can solve the problems of chargeability change, insufficient fixability, etc.

Active Publication Date: 2013-04-17
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, toners employing crystalline resins as main components still largely vary in chargeability depending on the environment, and have insufficient fixability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0332] In a reaction kettle including a thermometer and a stirrer, 100 parts of [Crystalline Resin 1] and 100 parts of ethyl acetate were placed, and the mixture was heated to a temperature of 50° C. and uniformly stirred to prepare [Resin Solution 1].

[0333] In a beaker, put 45 parts of [Resin Solution 1], 15 parts of [Crystalline Prepolymer 1], 14 parts of [Wax Dispersion 1] and 10 parts of [Color Dispersion 1], and pass through T.K.HOMO MIXER at 50°C and The mixture was stirred at 8,000 rpm until uniformly dissolved and dispersed, whereby [toner material liquid 1] was prepared.

[0334] In a beaker, uniformly dissolve 99 parts of ion-exchanged water, 6 parts of organic resin particles containing 25% by weight (adduct of ethylene oxide methacrylate for stable dispersion and styrene-methacrylate-butyl acrylate ester-sulfate sodium salt copolymer), 1 part of sodium carboxymethylcellulose and 10 parts of 48.5% sodium dodecyl diphenyl ether disulfonate (ELEMINOL MON-7, Sanyo C...

Embodiment 2

[0343] The preparation steps of [toner 1] in Example 1 were repeated to prepare [resin particles 2] and [toner 2], except that the pH of the alkalization process was changed from 11.0 to 12.0.

Embodiment 3

[0345] The preparation steps of [toner 1] in Example 1 were repeated to prepare [resin particles 3] and [toner 3], except that the pH of the alkalization process was changed from 11.0 to 10.0.

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Abstract

A toner, including a crystalline resin as a binder resin, wherein the toner comprises a THF-soluble component in a weight-average molecular weight not less than 20,000, and has a 50% wettability not less than 20% by volume when subjected to a methanol wettability test.

Description

technical field [0001] The present invention relates to a toner for imaging images using xerographic processes, such as in copiers, facsimile machines, printers, and the like. Background technique [0002] Recently, printers and MFPs employing electrophotographic image forming apparatuses have been required to consider the environment. For example, printers and MFPs reduce their power consumption to reduce CO 2 emissions, and the use of biomass materials to approach carbon neutrality. From this background, electrophotographic toners are required to lower their fixing temperature, and it is suggested that a binder resin used in the toner contains a crystalline resin that is rapidly dissolved by thermally fixing the toner. Further, even a crystalline resin is used as a main component of the binder resin. [0003] However, a toner employing a crystalline resin as a main component greatly varies in chargeability depending on the environment, and has insufficient fixability de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08755G03G9/08764G03G9/08793G03G9/08795G03G9/08797
Inventor 山本淳史中山慎也山田雅英山东秀行山下大树井上竜太
Owner RICOH KK
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