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Electrostatic image developing toner

An electrostatic image development and toner technology, which is applied in the directions of developers, electrographics, instruments, etc., can solve the problems of easy cracking, peeling, and brittleness of fixed images, and achieve excellent heat resistance and smearing resistance and crease. The effect of fixability, good heat-resistant storage, and elasticity

Active Publication Date: 2013-01-09
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the styrene-diene-based block copolymer cannot be uniformly dispersed in the main resin, so there is a problem that thermal offset occurs, and in addition, there is a problem that the crease fixability is low, that is, the obtained fixation The image is brittle, so when the fixed image is folded, the fixed image at the crease is easily broken and peeled off
[0009] In addition, as a technique for simultaneously improving the low-temperature fixability and heat-resistant storage properties of toners, toners made of toner particles having a core-shell structure have been proposed. On the basis of heat-resistant storage, a certain degree of low-temperature fixability is obtained, but there is a problem of low crease fixability
[0010] In addition, as a technique for achieving both low-temperature fixability and page sticking resistance, Patent Document 3 discloses a toner in which a rubber-like substance obtained by crosslinking raw rubber is used as a binder resin. Sufficient low-temperature fixability cannot be obtained for the toner

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0166] In the reaction container equipped with stirring device, temperature sensor, cooling pipe, nitrogen introduction device, add 8 mass parts of sodium lauryl sulfate and 3000 mass parts of ion-exchanged water, stir with the stirring speed of 230rpm under nitrogen flow, simultaneously will The temperature rose to 80°C. After temperature rise, the polymerization initiator solution which melt|dissolved 10 mass parts of potassium persulfates in 200 mass parts of ion-exchanged water was added, and liquid temperature was adjusted to 80 degreeC.

[0167] Then, a polymerizable monomer mixture composed of the following substances was added dropwise to the reaction vessel within 1 hour, and then heated at 80° C. for 2 hours, stirred and polymerized to prepare a dispersion of resin fine particles (1H).

[0168]

[0169] A solution prepared by dissolving 7 parts by mass of polyoxyethylene (2) sodium lauryl ether sulfate in 800 parts by mass of ion-exchanged water was added to a rea...

preparation example 2

[0179] The following raw materials were added to the heat-dried three-necked flask, and then refluxed at 180° C. for 5 hours by mechanical stirring in an inert gas atmosphere of nitrogen. Then, the water generated in the reaction system was removed by distillation under reduced pressure, and the temperature was raised to 240°C. The dehydration condensation reaction was continued at 240° C. for 3 hours, and then the molecular weight was measured by GPC (gel permeation chromatography). When the weight average molecular weight was 27,000, the vacuum distillation was stopped to obtain a polyester resin.

[0180]

[0181] Then, 100 parts by mass of the above-mentioned polyester resin, 50 parts by mass of ethyl acetate, 25 parts by mass of isopropanol and 5 parts by mass of 10% ammonia solution were added to a separable flask, mixed and dissolved, and heated at 40° C. While heating and stirring, ion-exchanged water was added dropwise through a liquid-feeding pump at a liquid-feed...

preparation example 2～17

[0201] According to the formula in the following Table 1, except for changing the type and / or addition amount of the added components, the others are the same as the preparation example 1 of the dispersion liquid of the domain resin particles, and the domain resin particles [B-2] to [B-2] are respectively prepared. -17] latex [LxB2] ~ [LxB17].

[0202] The glass transition temperature, volume-based median diameter, and toluene-insoluble content of the domain resin particles [B2] to [B17] in the obtained latexes [LxB2] to [LxB17] can be measured by the methods described above. The results are shown in Table 1.

[0203] [Preparation Examples 1 to 4 of Dispersion Liquid of Comparative Domain Resin Microparticles]

[0204] According to the recipe in the following Table 1, except for changing the type and / or addition amount of the added components, the others are the same as the preparation example 1 of the dispersion liquid of the domain resin particles, respectively preparing do...

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Abstract

The present invention provides a toner for developing an electrostatic image, which can form a high-quality image, and can obtain heat-resistant storage properties, page sticking resistance, and low-temperature fixability, and can obtain excellent heat offset resistance and Crease fixability. The toner for electrostatic image development of the present invention is made of toner particles containing a binder resin having a domain-matrix structure and a colorant, wherein the toner particles have a volume-based median particle size The diameter is 4.3-7.0 μm, the domain phase in the binder resin is composed of a polymer containing a structural unit derived from a diene monomer, and the Feret diameter of the domain phase is 50-300 nm, The glass transition temperature of the polymer constituting the domain phase is -85 to +35°C.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic image (hereinafter also simply referred to as "toner") for forming an electrophotographic image. Background technique [0002] In recent years, from the viewpoint of preventing global warming, energy conservation has been studied in various fields, and information equipment such as image forming devices has also been researched to save power during standby, so that it can be used with low energy. On the one hand, research has also been carried out in the fusing process, which consumes the most energy, in order to reduce the fusing temperature. [0003] Generally, if a toner design is applied to low-temperature fixing, the sticking resistance and heat-resistant storage performance will deteriorate. In order to achieve both low-temperature fixing and sticking resistance, for example, Patent Document 1 discloses a method for forming A toner for an electrophotographic image, wherein ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0819G03G9/0825G03G9/08711G03G9/08737G03G9/08755G03G9/08795G03G9/08797
Inventor 金野宽之中岛一比古
Owner KONICA MINOLTA BUSINESS TECH INC
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