Electrostatic image developing toner

A technology of toner and electrostatic charge, applied in the field of toner for electrostatic charge image development, to achieve excellent effects of low-temperature fixability and heat-offset resistance

Active Publication Date: 2017-08-04
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, at the proposed Net strength ratio of aluminum to tin, since the difference in melting speed between styrene-acrylic resin and polyester resin becomes large, high-gloss images cannot be formed on high-gloss paper

Method used

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Experimental program
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Effect test

preparation example Construction

[0169] For the preparation of the aqueous dispersion of vinyl resin particles, a microemulsion polymerization method can be used. For example, a vinyl monomer and a water-soluble radical polymerization initiator are added to an aqueous medium containing the aforementioned surfactant, and mechanical energy is applied to form liquid droplets. Polymerization proceeds in the droplets by radicals from the radical polymerization initiator. In addition, an oil-soluble polymerization initiator may be contained in liquid droplet.

[0170] The vinyl resin particles may have a multilayer structure of two or more layers in which the composition of each layer is different. A dispersion liquid of vinyl resin particles having a multilayer structure can be obtained by a multistage polymerization reaction. For example, a dispersion of vinyl resin having a two-layer structure can be prepared by polymerizing a vinyl monomer (first-stage polymerization) to prepare a dispersion of vinyl resin pa...

Embodiment

[0227] Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these Examples. In addition, the expression of "part" or "%" is used in an Example, Unless otherwise specified, it means "part by mass" or "% by mass".

[0228] [Styrene-acrylic (StAc) resin particle dispersion]

[0229] (Paragraph 1 aggregation)

[0230] In the reaction vessel that stirrer, temperature sensor, cooling pipe and nitrogen introduction device are installed, charge is made by sodium lauryl sulfate (C 10 h 21 (OCH 2 CH 2 ) 2 SO 3An aqueous surfactant solution in which 4 parts by mass of anionic surfactants composed of Na) were dissolved in 3040 parts by mass of ion-exchanged water. Furthermore, the polymerization initiator solution which melt|dissolved 10 mass parts of potassium persulfate (KPS) in 400 mass parts of ion-exchanged water was added, and liquid temperature was heated up to 75 degreeC.

[0231] Next, a polymerizable mo...

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Abstract

The invention aims to provide an electrostatic image developing toner. Even if vinyl resin and polyester resin exist, the low temperature fixing performance and heatproof and contamination-resistant properties of the electrostatic image developing toner are excellent; and the paper luster tracing ability is high. The electrostatic image developing toner is characterized by including a toner particle, wherein the toner particle contains a vinyl resin which is a polymer of a vinyl monomer having an acid group, a polyester resin, at least one of aluminum (Al) and magnesium (Mg), and tin (Sn), and when net intensities of Al, Mg and Sn in the toner particle measured by fluorescent X-ray analysis are respectively expressed as I Al , I Mg and I Sn , a ratio (I Al +I Mg ) / I Sn is within a range of 0.5 to 2.5.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image. More specifically, it relates to a toner having excellent low-temperature fixability and resistance to hot offset (offset) even in the coexistence of a vinyl resin and a polyester resin, and having high sensitivity to paper. Gloss-following toner for electrostatic image development. Background technique [0002] In electrophotographic image forming apparatuses, energy saving is sought for the purpose of speeding up image formation, reducing environmental load, etc., and therefore a toner for developing an electrostatic image that can be thermally fixed at a lower temperature is required (hereinafter Also referred to simply as toner.). [0003] In order to lower the fixing temperature of the toner, it is necessary to lower the melting temperature and melt viscosity of the binder resin constituting the toner. However, if the glass transition temperature (Tg) and mole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08G03G9/087G03G9/0804G03G9/0812G03G9/08708G03G9/08733G03G9/08795G03G9/08797G03G9/09321G03G9/09328G03G9/09364G03G9/09371G03G9/09392G03G9/08755G03G9/08711
Inventor 上田隼也宫岛谦史川村贵生
Owner KONICA MINOLTA INC
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