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Magnetic toner

A toner and magnetic technology, which is applied in the field of toner, can solve the problems of difficult to obtain magnetic toner of polyester resin, etc., and achieve the effects of excellent dot reproducibility, excellent fixability, and excellent high-temperature stain resistance

Inactive Publication Date: 2008-03-19
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, in the case of improvement in toner shape only by these methods, it is difficult to obtain a magnetic toner using a polyester resin capable of providing high image quality

Method used

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specific example

[0238] Specific examples include: lubricants such as fluorinated resins, zinc stearate or polyvinylidene fluoride, among which polyvinylidene fluoride is preferred; abrasives such as cerium oxide, silicon carbide or strontium titanate, among which strontium titanate is preferred; property-imparting agents such as titanium oxide or aluminum oxide, among which hydrophobic substances are preferred; antiblocking agents; conductivity-imparting agents such as carbon black, zinc oxide, antimony oxide or tin oxide; and development accelerators such as white and black fine particles, these materials can be used in small quantities.

[0239] The magnetic toner of the present invention can be produced by an ordinary method for producing toner particles for developing an electrostatic charge image. As materials of the magnetic toner of the present invention, at least the above-mentioned binder resin and magnetic iron oxide are used, and other materials such as colorants, waxes, charge con...

Embodiment 1

[0306] Dissolve 19.6 parts by weight of terephthalic acid in 100 parts by weight of pyridine, then add 80.4 parts by weight of tetra-n-butoxytitanium dropwise, and place the resulting mixture at 40°C for 2 hours under a nitrogen atmosphere to make the tetra-n-butoxytitanium Titanium oxide reacts with terephthalic acid. Then, pyridine and butanol formed by the reaction were distilled off under reduced pressure to produce aromatic carboxylate titanium compound 1 .

Embodiment 2

[0308] Except that 19.6 parts by weight of terephthalic acid was changed to 36.1 parts by weight of trimellitic anhydride, and 80.4 parts by weight of tetra-n-butoxytitanium was changed to 63.9 parts by weight, in the same manner as in Production Example 1 of the aromatic carboxylate titanium compound Implement the production process.

[0309] To produce aromatic carboxylate titanium compound 2.

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Abstract

A magnetic toner is disclosed having magnetic toner particles containing a binder resin and a magnetic iron oxide. The magnetic toner has a specific saturation magnetization and a specific residual magnetization in a certain magnetic field. The binder resin includes a polyester component polymerized with an aromatic carboxylic acid titanium compound as a catalyst.

Description

technical field [0001] The present invention relates to toners used in image forming methods such as electrophotography, electrostatic printing, magnetic recording or toner jetting. Background technique [0002] Various toners have been proposed to satisfy both the fixing performance and high-temperature offset resistance of the toner. In particular, a binder resin using a polyester component including a polyester component excellent in fixing performance and high-temperature offset resistance is used in equipment requiring high fixing ability such as high-speed equipment. However, this binder resin including a polyester component causes various defects in magnetic toners. [0003] In the case of polyester resins different from vinyl resins, it is difficult to form a linear polymer component having a large molecular weight, it is necessary to provide a binder resin having a cross-linked structure such as a gel component, and it is necessary to form a A structure of fouling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/083G03G9/087
CPCG03G9/08755G03G9/0835G03G9/09725G03G9/0836G03G9/0819G03G9/081G03G9/0833G03G9/09716
Inventor 小川吉宽长谷川雄介阿部真一郎西山淳子粕谷贵重
Owner CANON KK
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