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Polyester composition for toner, toner and electrostatic image contrast

A technology of electrostatic charge image and composition, applied in the direction of developer, electrography, optics, etc., can solve the problems of thermal offset, decrease of printed image density, poor environmental resistance of toner, etc. Reduced image density and excellent thermal offset resistance

Active Publication Date: 2014-09-24
HUBEI DINGLONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the further increase in speed and energy saving of electrostatic image forming devices, compared with the past, due to the shortening of the fixing time in the fixing process and the lowering of the equipment heating temperature, it is necessary to reduce the viscosity of the toner to maintain the same fixing firmness. The softening point of the binder resin, and with the decrease of the softening point of the binder resin, thermal offset is prone to occur, and at the same time, with the decrease of the glass transition temperature of the binder resin, the phenomenon of poor preservation of toner aggregation and agglomeration is prone to occur, so in the past Styrene acrylic resin is widely used as binder resin toner, which can no longer meet the high-speed and energy-saving requirements of image forming devices, but it is easy to achieve a balance between low temperature fixing, heat offset resistance and storage stability. Toners used as binder resins are gaining more and more attention
[0003] The polyester resin obtained by esterification and polycondensation of dicarboxylic acid and diol is suitable for low-temperature fixing due to its low molecular weight. Contains a certain amount of carboxyl and hydroxyl groups, has a certain degree of hygroscopicity, and is used as a toner with poor environmental resistance, especially in high temperature and high humidity environments, the charge of the toner decreases significantly, resulting in a decrease in the density of printed images

Method used

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  • Polyester composition for toner, toner and electrostatic image contrast
  • Polyester composition for toner, toner and electrostatic image contrast
  • Polyester composition for toner, toner and electrostatic image contrast

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0079] The above "toners 1 to 8" and the carrier (volume median diameter D 50 : 36μm, saturation magnetization: 60emu / g, volume resistivity: 1×10 13 Ω·cm) were mixed as follows to produce two-component "developers 1-8". 92 parts of carrier and 8 parts of toner were mixed in a mixer for 10 minutes to prepare a two-component developer; at the same time, 90 parts of toner and 10 parts of carrier were mixed to prepare a supplementary developer.

Embodiment 9

[0083]Mix 8 parts each of black toner (toner 1), cyan toner, magenta toner, and yellow toner with 92 parts of carrier (volume median diameter D 50 : 36μm, saturation magnetization: 60emu / g, volume resistivity: 1×10 13 Ω·cm) were mixed in a mixer for 10 minutes to prepare a 4-color two-component developer; at the same time black toner (toner 1), cyan toner, magenta toner, yellow toner 90 parts of each were mixed with 10 parts of the carrier respectively to prepare 4-color supplementary developers.

[0084] Toner and developer evaluation

[0085] Use a commercially available color copier (printing speed: 50ppm for color, 65ppm for black and white. Transformed into a test machine) as the image forming equipment, place the above-mentioned "developers 1 to 12" in the corresponding color positions in the developing equipment in sequence, and supplement the same color The developer is placed at the corresponding position. The 30K / 30K / 30K image continuous formation test was carried...

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Abstract

The invention provides a polyester composition for a toner, a toner and an electrostatic image contrast. The polyester composition disclosed by the invention is prepared from an acid component and an alcohol component as raw materials by esterification and polycondensation reaction, wherein the content of a terephthalic acid is 80.0-94.0wt% and the content of an m-phthalic acid is 6.0-20.0wt% in the gross of the acid component; the content of ethylene glycol is 50.0-80.0wt% and the content of 1,4-cyclohexanedimethanol is 20.0-50.0wt% in the gross of the alcohol component. The polyester composition disclosed by the invention is used as bonding resin for the toner, the problem of reduced image density in a high-temperature and high-humidity environment can be restrained, and the polyester composition has excellent fixation property and heat deviation resistance.

Description

technical field [0001] The present invention relates to a polyester composition for toner, a toner, and an electrostatic charge image developer. Background technique [0002] With the further increase in speed and energy saving of electrostatic image forming devices, compared with the past, due to the shortening of the fixing time in the fixing process and the lowering of the equipment heating temperature, it is necessary to reduce the viscosity of the toner to maintain the same fixing firmness. The softening point of the binder resin, and with the decrease of the softening point of the binder resin, thermal offset is prone to occur, and at the same time, with the decrease of the glass transition temperature of the binder resin, the phenomenon of poor preservation of toner aggregation and agglomeration is prone to occur, so in the past Styrene acrylic resin is widely used as binder resin toner, which can no longer meet the high-speed and energy-saving requirements of image f...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087
Inventor 朱顺全黎文部
Owner HUBEI DINGLONG CO LTD
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