Xerographic insulating dry single-component electropositive developer

An electrophotographic and insulating technology, which is applied in the directions of developer, electrography, optics, etc., can solve the problems of narrow application range of toner, complex composition of magnetic toner, complex manufacturing process, etc., and achieves good results and high performance indicators. Excellent, high-density copying effect

Inactive Publication Date: 2011-05-18
TIANJIN ZHONGHUAN TIANJIA ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing electrostatic copier developer manufacturing technology, the magnetic toner produced is relatively fine, and most of them are only suitable for a single type of electrostatic copier, and the composition of the magnetic toner is complex, difficult to process, and high in cost
In the selection of adhesive resin, two or more adhesive resins o...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment -

[0010] (weight ratio): MI is 100 parts of styrene-acrylic acid copolymers of 3.0, 60 parts of ferric oxide, 4 parts of low-molecular polypropylene, and 2 parts of nigrosine dyes. After weighing and mixing the above four kinds of raw materials, Use special high-precision mixing equipment to mix at a constant temperature to evenly disperse polypropylene, charge regulator and other substances into the mixture. After mixing the raw materials, they are cooled, pre-crushed, coarsely pulverized, finely pulverized, and classified. Graded products with the following particle size distribution:

[0011] Number average diameter: 6.43μm, below 5.04: 26.37%,

[0012] Volume average diameter; 8.76μm 0.05% above 16.0μm

[0013] Add 0.6 parts of hydrophobic silicon dioxide to the above graded product, mix thoroughly to obtain the desired developer. The developer is used in NP8500 and GP605 copiers, and the copied image is clear and durable.

specific Embodiment 2

[0014] (weight ratio): MI is 100 parts of styrene-acrylic acid copolymers of 2.0, 50 parts of ferric oxide, 4 parts of low-molecular polypropylene, 2 parts of nigrosine dyes, after above-mentioned four kinds are processed by the method for embodiment 1 Obtain the graded product of following particle size distribution:

[0015] Number average diameter: 5.71m, below 5.04: 24.37%,

[0016] Volume mean diameter; 9.35μm 1.20% above 16.0μm

[0017] Add 0.6 parts of hydrophobic silicon dioxide to the above graded product, mix thoroughly to obtain the desired developer. The developer is used in NP8500 and GP605 copiers, and the copied image is clear and durable.

specific Embodiment 3

[0018] Specific embodiment three: (weight ratio): MI is 100 parts of styrene-acrylic acid copolymers of 4.5, 70 parts of ferric oxide, 4 parts of low-molecular-weight polypropylenes, 2 parts of nigrosine dyes, above-mentioned four kinds are pressed embodiment After the method processing of 1, obtain the graded product of following particle size distribution:

[0019] Number average diameter: 5.71m, below 5.04: 24.37%,

[0020] Volume mean diameter; 9.35μm 1.20% above 16.0μm

[0021] Add 0.6 parts of hydrophobic silicon dioxide to the above graded product, mix thoroughly to obtain the desired developer. The developer is used in NP8500 and GP605 copiers, and the copied image is clear and durable.

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Abstract

The invention relates to a xerographic insulating dry single-component electropositive developer for an electrostatic xerographic printer, which comprises the following components in percentage by weight: 40 to 80 percent of adhesive resin, 20 to 60 percent of magnetic material, 1 to 8 percent of charge controlling agent, 0.1 to 0.8 percent of internal additive and 0.1 to 0.8 percent of external additive, wherein the adhesive resin adopts a styrene-acrylic acid copolymer with the polymerization rate of 70:25:5, the average molecular weight of 0.1 to 0.2 million and the melt index MI of 1.5 to 5.5; the magnetic material adopts ferroferric oxide, and has the average particle size of 0.1 to 2.0 mu m, and magnetic characteristics such as the saturation magnetization of 60 to 100 emv/g and the coercive force of 90 to 1400 e in the magnetic field of 10 Koe; and the charge controlling agent adopts an aniline black dye. The developer simplifies processing technique and reduces the production cost, and can xerox images which have high concentration and high resolution with less bottom ash.

Description

technical field [0001] The invention relates to a magnetic positive developer for electrostatic printing, in particular to a dry-type single-component positive developer for electrostatic printing of positive electrostatic copiers. Background technique [0002] In the existing electrostatic copier developer manufacturing technology, the produced magnetic toner is relatively fine, and most of them are only suitable for a single type of electrostatic copier, and the composition of the magnetic toner is complex, difficult to process, and high in cost. In the selection of adhesive resin, two or more adhesive resins of different standards are generally used to polymerize, which has strict requirements on the charging performance, magnetic performance, powder characteristics and processing process of the toner. And restrictions, thus making the manufacturing process more complicated and increasing product costs, while the use of toner is narrow, often only for a single type of cop...

Claims

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Application Information

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IPC IPC(8): G03G9/097
Inventor 姜真韩立胜王金平李美英
Owner TIANJIN ZHONGHUAN TIANJIA ELECTRONICS
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