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Method for producing electrophotographic toner

An electrophotography and manufacturing method technology, applied in the direction of developer, electrography, instrument, etc., can solve the problems of reduced fluidity of toner, unstable supply device, image defects, etc., and achieve stable supply and excellent fluidity , The effect of small changes in image density

Inactive Publication Date: 2006-07-26
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this regard, some people have proposed the technology of adding a liquid lubricant (for example, see Patent Documents 1 to 3), but when a low-viscosity liquid lubricant is kneaded with a resin, there are problems of large viscosity difference and poor dispersion.
In further pulverization, due to cracking from the surface of the liquid lubricant, the liquid lubricant is often present or leaked on the surface of the toner, and the fluidity of the toner is reduced due to the viscosity of the liquid lubricant
As a result, the toner supply device becomes unstable, and the problem of image defects arises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0098] The following examples are given to illustrate the present invention, but the present invention is not limited thereto.

[0099] Example

[0100] [production of toner]

[0101] Toner 1 of the present invention

[0102] 1. Production of surface resin particles s1 constituting the surface of the toner

[0103] A resin particle dispersion (S1) containing the surface resin particles s1 fixed to the surface of the substrate particles is prepared.

[0104] [Manufacture of resin particle (1-1-1) for surface]

[0105] "Preparation of polymerizable monomer solution 1-1-1"

[0106] The polymerizable monomer solutions are mixed. This was referred to as polymerizable monomer solution 1-1-1.

[0107] Styrene 70.1 parts by mass

[0108] 19.9 parts by mass of n-butyl acrylate

[0109] 10.9 parts by mass of methacrylic acid

[0110] In a 5000mL separable flask with a stirring device, a temperature sensor, a cooling tube, and a nitrogen introduction device, 7.08 parts by mass o...

manufacture example

[0209] 700 parts by mass of ion-exchanged water and 0.1 mol / L-Na 3 PO 4 800 parts by mass of the aqueous solution was heated to 65° C. with the rotational speed of the high-speed stirring device set at 12,000 rpm. Add 1.0 mol / L-CaCl to it 2 70 parts by mass of an aqueous solution, formulated to contain a small and insoluble dispersion stabilizer Ca 3 (PO 4 ) 2 aqueous dispersion medium.

[0210] On the other hand, take a mixture consisting of:

[0211] 2 parts by mass of carbon black

[0212] LV-7 (poly(1-butene) manufactured by Nippon Oil Corporation, dynamic viscosity at 40°C is 12.1 mm 2 / s) 5 parts by mass

[0213] 47 parts by mass of styrene

[0214] Static control agent (dialkyl aluminum salicylate compound) 2 parts by mass

[0215] Polyester resin (peak molecular weight = 7,000) 5 parts by mass

[0216] The pigment dispersion composition was prepared by dispersing for 1 hour with a T.K. Alternatively, in another container, in a mixture consisting of:

[021...

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PUM

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Abstract

The present invention provides a toner for electrophotography which is free of lowering of fluidity, so that a toner supply mechanism is stabilized, which has good storage stability even if the fixing temperature is lowered, and which does not cause adhesion of front and back sides for both side printing, and to provide a method for manufacturing the toner. The toner for electrophotography is obtained by polymerizing a polymerizable monomer in the presence of at least a liquid hydrocarbon, wherein the polymerizable monomer has a polar group and the liquid hydrocarbon is nonpolar and has a kinematic viscosity at 40[deg.]C of 7-300 mm2 / s, and the liquid hydrocarbon is not exposed the surface but enclosed onthe toner grain.

Description

technical field [0001] The present invention relates to a method for producing a toner for electrophotography. Background technique [0002] An oil-free fixing process in which toners for electrophotography are fixed without using coating oil has become mainstream with the spread of small printing machines in recent years. In order to further promote low-temperature fixing of toner, it is considered effective to add a large amount of a crystalline organic compound that can be used as a release agent. When increasing more, since the heat of fusion is absorbed accompanying the melting of the release agent, It becomes an obstacle to the development of low-temperature fixing toner. In this regard, a technique of adding a liquid lubricant has been proposed (for example, see Patent Documents 1 to 3). However, when a low-viscosity liquid lubricant is kneaded with a resin, there is a problem of large viscosity difference and poor dispersion. In further pulverization, due to cracki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/08764G03G9/09328G03G9/09321G03G9/09392G03G9/08795G03G9/0806G03G9/08797G03G9/08733G03G9/08788G03G9/0904G03G9/08711G03G9/08768G03G9/09783G03G9/09708G03G9/08791G03G9/09725G03G9/08728G03G9/08782G03G9/08786G03G9/09716
Inventor 林健司神山干夫安川裕之
Owner KONICA MINOLTA BUSINESS TECH INC
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