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Toner and method for producing same

A production method, technology of toner, applied in the field of toner, capable of solving problems such as staining of fixing member, insufficient release property, unsatisfactory bleeding, etc., and achieving an effect of excellent durability

Pending Publication Date: 2019-06-07
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when only the introduction itself is carried out, bleeding of wax to the toner surface during fixing is unsatisfactory, and then fouling of the fixing member occurs due to insufficient releasability during fixing

Method used

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  • Toner and method for producing same
  • Toner and method for producing same
  • Toner and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0076] Preparation steps of polymerizable monomer composition

[0077] A polymerizable monomer composition is prepared by combining and mixing: a polymerizable monomer capable of producing a binder resin including a styrene-acrylic copolymer, a wax including Wax A, and as needed, such as a colorant , polar resins and other components such as charge control agents.

[0078] The colorant may be previously dispersed in a polymerizable monomer or an organic solvent using, for example, an agitated media mill, and then combined and mixed with other components, or the colorant may be dispersed after the entire composition is mixed.

[0079] Granulation step of granules of polymerizable monomer composition

[0080] The particles of the polymerizable monomer composition are formed in an aqueous medium by preparing an aqueous medium containing a dispersion stabilizer and introducing it into, for example, a stirring vessel provided with an agitator capable of generating high shear fo...

Embodiment 1～15 and comparative example 1～6

[0283] Toner 1 was obtained by adding 1.0 parts of silica fine particles having a number average primary particle diameter of 40 nm to 100.0 parts of the obtained toner particles and mixing using an FM mixer (Nippon Coke & Engineering Co., Ltd.) ~13, 20 and 21 (toners in Examples 1-13, 14 and 15). Toners 14 to 19 (toners in Comparative Examples 1 to 6) were obtained in exactly the same manner. The properties of the obtained toners are given in Table 2.

[0284] [Table 2]

[0285]

[0286] In the tables, "r1" means the average long diameter of the wax domains and "r2" means the average short diameter of the wax domains, and "D4" means the weight average particle diameter of the toner particles.

[0287] Performance evaluation was performed on each of the obtained toners using the following methods.

[0288] Evaluation 1: Image Density After Left Under Severe Conditions

[0289] 200 g of the toner was kept in a 40°C / 95% relative humidity environment for 30 days, and the...

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Abstract

The invention relates to a toner and a method for producing same. The toner comprises: a toner particle that contains a binder resin and a wax, wherein the binder resin contains a styrene-acrylic copolymer, the content of the styrene-acrylic copolymer in the binder resin is at least 50 mass %, the wax contains a wax A, at least 15.0 mass parts of the wax A compatibilizes at 100 DEG C. with 100 mass parts of a specific styrene-butyl acrylate copolymer, and in a cross section of the toner particle observed using a scanning transmission electron microscope, domains of the wax are present, the average number of the domains is from 20 to 2,000, and using r1 for the average major diameter of the domains and r2 for the average minor diameter of the domains, r1 is from 0.03 [mu]m to 1.00 [mu]m, and the ratio of r1 to r2 is from 1.0 to 3.0.

Description

technical field [0001] The present invention relates to a toner for forming a toner image by developing an electrostatic latent image formed by methods such as electrophotography, electrostatic recording, and toner jet recording. The present invention further relates to a method for producing the toner. Background technique [0002] In recent years, energy saving has become a major technical issue in copiers, printers, and facsimiles, and it is expected to greatly reduce the amount of heat required for image fixing devices. Therefore, with regard to toners, image fixability at lower energy, ie, low-temperature fixability, is highly demanded. [0003] One general method for improving the low-temperature fixability of toner is to lower the glass transition temperature (Tg) with the aim of softening the binder resin used. However, when the Tg of the binder resin is lowered only by the binder resin itself, the following occurs: fouling of the fixing member occurs due to insuff...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087G03G9/093
Inventor 中川義广岛野努田川丽央下田卓
Owner CANON KK
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