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Electronegative one-component developing agent

A one-component, developer technology, used in developer, electrography, optics, etc.

Inactive Publication Date: 2009-12-30
TIANJIN ZHONGHUAN TIANJIA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing technology and meet the needs of the high-end copying market, the present invention provides a negative one-component developer, which has high image density, good uniformity, no attenuation in continuous copying, almost no bottom dust, and no stickiness. Drum, good fixation and other advantages, meet the needs of various models in the mid-to-high-end market, and the manufacturing technology is simple, easy to control, low cost, and less pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] The weight percentage of each component is: polyester resin: 30%, magnetic powder: 55%, polypropylene wax: 8%, charge regulator: 3%, external additive: 4%. Among them, the polyester resin is composed of 20% polyester resin with a softening point of 160-180°C and 10% polyester resin with a softening point of 90-110°C; polypropylene wax is composed of 6% polyester resin with a softening point of 148°C. It is composed of propylene wax and 2% polypropylene wax with a softening point of 148°C; the external additive is composed of 0.67% of traditional external additive and 0.33% of ultra-fine titanium dioxide.

[0012] The preparation process is as follows: firstly weigh two kinds of resins, two kinds of polypropylene waxes, traditional additives and ultrafine titanium dioxide according to the above proportions, fully mix them in different containers respectively, and set them aside for later use. After weighing and mixing the resin mixture and magnetic powder, use special hi...

Embodiment 2

[0016] The weight percent of each component is: polyester resin: 65%, magnetic powder: 30%, polypropylene wax: 3%, charge regulator: 0.3%, external additive: 1.7%. Among them, the polyester resin is composed of 37% polyester resin with a softening point of 160-180°C and 28% polyester resin with a softening point of 90-110°C; polypropylene wax is composed of 2% polyester resin with a softening point of 148°C. It is composed of propylene wax and 1% polypropylene wax with a softening point of 148°C; the external additive is composed of 1.2% traditional external additive and 0.5% ultrafine titanium dioxide. Its preparation process is the same as embodiment one.

[0017] The charged amount of the produced negative one-component developer is -16.34 μc / g, and the degree of agglomeration is 23.78%. The application situation on the new high-speed digital copier is as follows:

[0018]

Embodiment 3

[0020] The weight percent of each component is: polyester resin: 46.5%, magnetic powder: 45%, polypropylene wax: 5%, charge regulator: 1.5%, external additive: 2%. Among them, the polyester resin is composed of 30% polyester resin with a softening point of 160-180°C and 16.5% polyester resin with a softening point of 90-110°C; polypropylene wax is composed of 3% polyester resin with a softening point of 148°C. It is composed of propylene wax and 2% polypropylene wax with a softening point of 148°C; the external additive is composed of 1.5% traditional external additive and 0.5% ultrafine titanium dioxide. Its preparation process is the same as embodiment one.

[0021] The weight percentage of each component is: (160~180) ℃ high softening point polyester resin 32%, (90~110) ℃ low softening point polyester resin 16%, magnetic powder: 45%, 148 ℃ softening point 2.5% polypropylene wax, 1.0% polypropylene wax with a softening point of 161°C, 2.3% charge regulator, 0.67% traditiona...

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Abstract

The invention relates to electronegative one-component developing agent used for a high-speed digital copier. The developing agent has the following components by weight ratio: 30-65% of polyester resin, 30-55% of magnetic powder, 2-8% of polypropylene wax, 0.3-3% of charged modifier, and 0.5-4% of external addictive, wherein, the polyester resin is formed by mixing high softening point polyester resin and low softening point polyester resin, and the polypropylene wax is formed by mixing two waxes with different softening points. The produced electronegative one-component developing agent can be used for the high-speed digital copier; the indexes of image density, resolution, level, bottom ash, mucosal property, firm fixation and the like reach the international standard, thus breaking monopoly positions of large international companies on novel digital copier ink powder market and supplying the gap of home and abroad compatible market.

Description

technical field [0001] The invention relates to a negatively charged one-component developer, which is used in high-speed digital copiers. Background technique [0002] In recent years, the international office automation market has launched new high-speed digital duplicators such as ceramic fast fixing and IH conduction fast fixing, which reduce the fixing temperature and realize fast copying when the machine is turned on. At present, the negative one-component developer in the domestic market has poor versatility, and can only meet the requirements in terms of image density, background dust, image layer, resolution, stickiness, fixation, fluidity, environmental adaptability, storage, and transportation. The basic requirements of the low-end market, but for the high-end market of high-speed digital copiers, the attenuation of image density, background dust, image adhesion and fixation firmness during continuous copying have always been difficult problems for many toner manu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097
Inventor 姜真韩立生冯华栋刁运佳
Owner TIANJIN ZHONGHUAN TIANJIA ELECTRONICS
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