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Toner using resin insoluble in organic solvents and preparation method thereof

An organic solvent and toner technology, which is applied in the field of toner and its preparation, can solve the problem that the toner cannot solve thermal smearing, etc., and achieve the effects of increasing the fixing temperature range, improving charging stability, and preventing thermal smearing Effect

Inactive Publication Date: 2011-02-23
LOTTE FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the toner produced using the resin cannot solve the thermal offset problem, and there are also problems in the occurrence of ink build-up and durability.

Method used

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  • Toner using resin insoluble in organic solvents and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0105] A reactor with a volume of 3 liters provided with a stirrer, a thermometer and a condenser was placed in an oil bath as a heat transfer medium. In the reactor set up like this, add various monomers, i.e. 50 parts by weight (50g) of dimethyl terephthalate, 47 parts by weight (47g) of dimethyl isophthalate, 80 parts by weight of 1,2-propanediol (80g) and trimellitic acid 3 parts by weight (3g). Thereafter, 9 mg of dibutyltin oxide (ratio of 500 ppm relative to the total monomer weight) was added as a catalyst. The mixture in the reactor was then stirred at a speed of 150 rpm, and the reaction temperature was increased to 150°C. Thereafter, after performing the reaction for about 6 hours, the reaction temperature was further increased to 220°C. Next, in order to remove by-products, the reactor was depressurized to 0.1 torr, and the pressure was maintained for 15 hours, and then the reaction was terminated. As a result, a polyester resin was obtained.

[0106] After the...

manufacture example 2

[0108] Manufacturing Example 2: Preparation of Black Pigment Masterbatch

[0109]The polyester resin synthesized in Production Example 1 and carbon black pigment (NIPEX150, a product of Degussa, Germany) were mixed in a ratio of 8:2 on a weight basis. Thereafter, 50 parts by weight of ethyl acetate was added with respect to 100 parts by weight of the polyester resin, and the mixture was heated to about 60° C. and then mixed with a stirrer for 1 hour. Next, the above-mentioned mixture was mixed at a speed of 50 rpm using a twin-screw extruder connected to a vacuum device, and ethyl acetate as a solvent was removed using a vacuum device to obtain a black pigment masterbatch.

manufacture example 3

[0110] Manufacturing Example 3: Preparation of Cyan Pigment Masterbatch

[0111] Except that the polyester resin synthesized in Production Example 1 and cyan pigment (C.I. Pigment Blue 15:3, color index No. 74160, product of Nippon Ink Chemicals Corporation (DIC)) were mixed at a ratio of 6:4 on a weight basis. , prepare cyan pigment masterbatch according to the same method as Manufacturing Example 2.

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Abstract

The present invention relates to a toner using a resin insoluble in organic solvents and a preparation method thereof. The disclosed method comprises: (a) dry-milling the insoluble resin to prepare microparticles or wet-dispersing the insoluble resin to prepare a fine suspension; (b) mixing a resin containing an acid group, a colorant, and at least one additive in the organic solvent and then dissolving the mixture to prepare a toner solution; (c) adding the insoluble resin microparticles or the fine suspension into the toner solution to prepare an insoluble resin-toner solution; (d) adding the insoluble resin-toner solution into a dispersion medium to prepare a fine toner suspension; and (e) removing the organic solvent from the fine toner suspension. The insoluble resin is a crosslinkable polystyrene resin or cycloolefin resin. The weight ratio of the insoluble resin to the resin having the acid group is 5:95 to 40:60. Accordingly, the method can prevent hot offset due to the wide fixing temperature of the toner. Also, the method can improve both static stability according to environmental changes and durability of the toner at a high temperature. Additionally, the disclosed toner can be applied to an electrophotographic-imaging apparatus.

Description

technical field [0001] The present invention relates to a toner and a method for producing the same, and more particularly relates to the possibility of preventing hot offset by increasing the fixing temperature range, improving high-temperature storage stability, and improving charging stability according to changes in the surrounding environment Toner and its preparation method. Background technique [0002] An image forming device for electrophotography such as a copier or a printer forms an electrostatic latent image on a photoconductive photoreceptor, and electrostatically adheres charged insulating toner to the electrostatic latent image by friction with a carrier or a charging member On, a toner image is formed. Thereafter, the formed toner is transferred to a printing medium such as plain paper or film, and then fixed by heating, pressurizing, evaporating a solvent, etc. to complete image formation. [0003] On the other hand, recently, miniaturization and personal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/08704G03G9/08797G03G9/08793G03G9/08795G03G9/0806G03G9/08755G03G9/0821G03G9/08791G03G9/08
Inventor 安德均梁佑荣金建一黄大一金一赫朴宰范黄日宣黄在光崔大雄金东垣
Owner LOTTE FINE CHEM CO LTD
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