Unlock instant, AI-driven research and patent intelligence for your innovation.

Method of preparing toner and toner prepared thereby

A toner, organic solvent technology, applied in the field of toner preparation

Inactive Publication Date: 2011-03-30
RICOH KK
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of the processes involved, especially when removing organic solvents, cannot be said to be sufficient for the preparation of spherical toners with small particle sizes and narrow particle size distributions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of preparing toner and toner prepared thereby
  • Method of preparing toner and toner prepared thereby
  • Method of preparing toner and toner prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0059] figure 1 is a schematic diagram showing an embodiment of a pipe used in the process of volatilizing an organic solvent in the method for producing a toner of the present invention.

[0060] exist figure 1 Among them, the double pipe 10 includes an outer pipe 11 , an inner pipe 12 , a feed opening 13 and a discharge opening 14 . The heating medium 15 is located between the outer pipe 11 and the inner pipe 12 , and heats the outer wall surface of the inner pipe 12 . Also, the inner pipe 12 is depressurized by a vacuum pump (not shown) to have an inner pressure of not more than 70 kPa. The second liquid is fed from the feed opening 13 located above the inner pipe 12 to form a liquid film (flow) flowing downward almost vertically along the inner wall surface of the inner pipe 12 . Then, since the temperature of the second liquid is not higher than the glass transition temperature of the mother particles through the inner wall surface of the inner pipe 12, the mother part...

Embodiment 1

[0184] First, a fine particle resin dispersion, polyester, prepolymer, masterbatch (composite formed of a mixture of a modified layered inorganic mineral and a resin), a toner component dispersion, and an aqueous medium were respectively prepared by the following methods, to prepare toner.

[0185] (preparation of microparticle resin dispersion)

[0186] 683 parts of water, 11 parts of sodium salt of an adduct of sulfuric acid ester and ethylene oxide methacrylate (ELEMINOLRS-30, Sanyo Chemical Industries, Ltd.), 83 parts of styrene, 83 parts of methacrylate, 110 parts of butyl acrylate and 1 part of ammonium persulfate were mixed in a reactor vessel including a stirrer and a thermometer, and the mixture was stirred at 400 rpm for 15 minutes to prepare a white emulsion therein. The white emulsion was heated to a temperature of 75°C and reacted for 5 hours. Also, 30 parts of an aqueous solution of ammonium persulfate at a concentration of 1% was added thereto and the mixture ...

Embodiment 2

[0211] The procedure for preparing the toner in Example 1 was repeated except that the amounts of the aqueous medium 1 and the toner component dispersion 1 were changed.

[0212] (preparation of the second liquid)

[0213] 27 kg of Toner Component Liquid 1 and 33 kg of Aqueous Medium 1 were mixed to react them with each other while stirring for 30 minutes to prepare 60 kg of Emulsion 2 . The viscosity of the emulsion (second liquid) was 650 mPa·s when measured with a Brookfield viscometer at 60 rpm and a temperature of 25°C. The emulsion contained ethyl acetate in an amount of 22% by weight and a solid content in an amount of 25% by weight (solid content of the slurry before evaporation of the organic solvent).

[0214] (volatile organic solvent)

[0215] Use under their respective conditions in the following five-step process figure 1 The dual pipeline 10 in the emulsion volatilizes the organic solvent in the emulsion (second liquid).

[0216] [First step]: When the inner...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
viscosityaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method of preparing toner and a toner prepared thereby. The method of preparing a toner, including dissolving toner constituents including a binder resin or a binder resin precursor, a colorant and a release agent in an organic solvent to prepare a first liquid; emulsifying the first liquid in an aqueous medium to prepare a second liquid having a viscosity of from 50 to800 mPasec; and at least flowing the second liquid almost vertically down along the wall surface of a pipe in which the air pressure is depressurized to 70 kPa or less twice while keeping a temperature of the second liquid not higher than a Tg of the parent particle through the wall surface thereof to volatilize the organic solvent, wherein a solid content of a slurry after volatilized is from 15to 50%, and a ratio of the solid content to a solid content of a slurry before volatilized is from 1.05 to 2.00.

Description

technical field [0001] The present invention relates to a method of preparing a toner that produces high-quality images in image forming techniques using electrophotography, such as copiers, laser printers, and facsimile machines. Background technique [0002] Recently, strong demand for higher quality images from the market has stimulated the development of electrophotographic image forming devices and toners. So-called spherical toners having a narrow toner particle size distribution are known to be suitable for producing such higher-quality images. The performance of this toner during development is predictable and microdot reproducibility is improved. However, spherical toners are difficult to remove properly due to their small particle size and narrow particle size distribution. In particular, it is difficult for a blade cleaner to reliably remove such toner. [0003] Therefore, methods of deforming toner particles are known. This reduces the fluidity of the toner t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/08797G03G9/0819G03G9/09716G03G9/0806G03G9/08795G03G9/08755G03G9/0821G03G9/0827
Inventor 山田博齐藤彰法山田雅英
Owner RICOH KK