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Toner and method of preparing the same

A technology of toner and toner image, applied in the field of toner with a core-shell structure, can solve the problems of reverse charging of toner, decrease of image definition, and deterioration of particle size distribution, and achieve low initial Effects of image density, improved charging rate, and wide melting range

Inactive Publication Date: 2009-09-30
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of isolated latex particles for toner particle capsules is complicated, and the aggregation-coalescence of the latex used to form shells for toner particles is due to occur between particles of desired size. Adhesion makes the particle size distribution worse
[0012] Therefore, poor particle size distribution will in turn lead to scattering, opposite charging of toner, loss of image sharpness, etc.

Method used

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  • Toner and method of preparing the same
  • Toner and method of preparing the same
  • Toner and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] The deionized water of 407g, carbon black (Mogul-L, DIC), wax (Esterwax, WE-3 and WE-8) and the styrene-acrylic acid copolymer latex of 246g are put into the reactor of 1L and use flat impeller to Stir at 150 rpm for 10 minutes. After stirring, adjust the pH to 10 and inject 0.05M MgCl 2 solution. Then, the temperature was raised to 85° C. to perform aggregation-coalescence for 4 hours. The latex used is shown in Table 1. Subsequently, the pH was adjusted to 9 and the solution was gradually heated. When the particle shape was formed after heating for about 6 hours, the solution was cooled and filtered to obtain toner particles. Performance results are shown in Table 2.

Embodiment 2

[0085] The deionized water of 407g, yellow pigment (YX-101, DIC), wax (Esterwax, WE-3 and WE-8) and the styrene-acrylic acid copolymer latex of 246g are dropped in the reactor of 1L and with flat impeller Stir at 150 rpm for 10 minutes. After stirring, adjust the pH to 9 and inject 0.05M MgCl 2 solution. Then, the temperature was gradually raised to 90° C. for aggregation-coalescence. When the particle size reaches 5.0-5.5 μm, the pH is adjusted to 11 and aggregation-coalescence is performed. Latex used in embodiment 2 is as shown in table 1. When the particle shape was formed after heating for about 7 hours, the solution was cooled and filtered to obtain toner particles. Performance results are shown in Table 2.

Embodiment 3

[0087] Experiment with the same method as in Example 1. Latex used in embodiment 3 is shown in table 1. Performance results are shown in Table 2.

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Abstract

The present invention provides a toner having a core-shell structure which is formed by aggregation-coalescence of latex particles having a bimodal particle size distribution. With the toner according to the present invention, it is easy to prevent scattering and image offset by enhancing adhesivity and charge-up rate, as well as to control morphology of the particles and to adjust to a uniform particle size distribution.

Description

technical field [0001] The present invention relates to a toner and a preparation method thereof. More specifically, the present invention relates to a toner having a core-shell structure formed by aggregation-coalescence of latex particles having a bimodal particle size distribution and a method of manufacturing the toner. Background technique [0002] In the field of electrophotography or electrostatic recording, developers used to make electrostatic images or electrostatic latent images visible mainly include two-component developers consisting of toner and carrier particles, containing no carrier and consisting essentially of toner only 1-component developers, and 1.5-component developers that include only carrier particles during development. The one-component developer includes a magnetic one-component developer containing a magnetic material and a non-magnetic one-component developer not containing a magnetic material. When designing a toner suitable for a developin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/093
CPCG03G9/0819G03G9/09392G03G9/0804G03G9/093G03G9/087
Inventor 朴锺喆金美善白景贤朴晋圭
Owner CHEIL IND INC
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