Developing agent and image forming apparatus

A developer and image technology, applied in the direction of developer, electric recording process using charge pattern, equipment for electric recording process using charge pattern, etc., can solve uneven distribution of toner surface, difficulty in uniform dispersion of additives, charge amount Uneven distribution and other problems, to achieve the effect of good charging characteristics, improved immobilization, and fast charging

Inactive Publication Date: 2012-03-14
KK TOSHIBA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This additive is difficult to disperse uniformly and tends to be unevenly distributed on the toner surface
As a result, uneven charging amount distribution occurs due to deterioration of initial charging, leading to internal contamination such as toner scattering or image defects such as excessive toner adhesion.

Method used

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  • Developing agent and image forming apparatus
  • Developing agent and image forming apparatus
  • Developing agent and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Polyester resin: (softening point Tm: 100°C to 120°C, glass transition temperature Tg: 54°C to 60°C) 85 parts by weight

[0069] Crystalline polyester resin (softening point Tm: 100°C to 120°C) 5 parts by weight

[0070] Ester wax 3 parts by weight

[0071] Coloring material (MA-100) 6 parts by weight

[0072] Charge control agent (polysaccharide compound containing aluminum+magnesium) 1 part by weight

[0073] After the above-mentioned materials were mixed via a Henschel mixer, they were melt-kneaded using a twin-screw extruder. After cooling the obtained molten kneaded product, it was coarsely pulverized using a hammer mill (Hammer Mill), then finely pulverized and classified using a jet mill, and finally obtained a volume average diameter of 5.5 μm, and a toner softening point Tm of Toner particles at 105°C.

[0074] A toner was produced by adding and mixing 3.0 parts by weight of sol-gel method silica fine particles having an average primary particle diameter of...

Embodiment 2

[0085] Polyester resin: (softening point Tm: 100°C to 120°C, Tg: 54°C to 60°C) 85 parts by weight

[0086] Crystalline polyester resin (softening point Tm: 100°C to 120°C) 0 parts by weight

[0087] Ester wax 8 parts by weight

[0088] Coloring material (MA-100) 6 parts by weight

[0089] Charge control agent (polysaccharide compound containing aluminum+magnesium) 1 part by weight

[0090] The above-mentioned material was prepared in the same manner as in Example 1 to obtain toner particles having a volume average diameter of 7.0 μm and a toner softening point Tm of 110° C.

[0091] With respect to 100 parts by weight of the toner particles, 1.0 parts by weight of a sol-gel method silica fine particle compound having an average primary particle diameter of 65 nm and an average circularity of 0.90, an average primary particle A toner was prepared using 2.0 parts by weight of hydrophobic silica having a diameter of 20 nm and 0.5 parts by weight of hydrophobic titanium oxide h...

Embodiment 3

[0096] Polyester resin: (softening point Tm: 100°C to 120°C, Tg: 54°C to 60°C) 78 parts by weight

[0097] Crystalline polyester resin (softening point Tm: 100°C to 120°C) 10 parts by weight

[0098] 5 parts by weight of ester wax

[0099] Coloring material (MA-100) 6 parts by weight

[0100] Charge control agent (polysaccharide compound containing aluminum+magnesium) 1 part by weight

[0101] The above-mentioned material was prepared in the same manner as in Example 1 to obtain toner particles having a volume average diameter of 6.0 μm and a toner softening point Tm of 95° C.

[0102] With respect to 100 parts by weight of the toner particles, 2.5 parts by weight of a sol-gel method silica fine particle compound having an average primary particle diameter of 60 nm and an average circularity of 0.94 and an average primary particle size of 2.5 parts by weight were added and mixed using a Henschel mixer. A toner was produced using 0.5 parts by weight of hydrophobic titanium o...

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Abstract

Embodiments of the invention provide a developing agent and an image forming apparatus. The developing agent includes a toner particle containing a binder resin and a coloring agent, and additives added onto the surface of the toner particle. The additives contain a silica fine particle having an average circularity of 0.90 or more. In the additives existing on the surface of the toner particle, an existence ratio of an additive having a minor axis a of a primary particle diameter falling within the range of from 30 nm to 70 nm is 70% or more.

Description

[0001] Cross References to Related Applications [0002] This application is based upon and claims the benefit of priority from US Provisional Application No. 61 / 376022, filed August 23, 2010, the entire contents of which are hereby incorporated by reference. technical field [0003] Embodiments of the present invention relate to a developer and an image forming apparatus. Background technique [0004] Considering the environment, low-temperature fixing with toner is advocated in terms of energy saving. The low-temperature fixing of the toner is achieved by using a low-melting resin as a binder resin that accounts for most of the constituent materials of the toner. [0005] However, resins with low melting points tend to have low viscosity during melt mixing, and the shear force of the mixture is lower than conventional ones, resulting in poor material dispersibility. Since such toners have uneven charging sites, the chargeability of the toner is ensured by covering the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097G03G9/08G03G15/00
CPCG03G9/0819G03G9/0821G03G9/08795G03G9/08797G03G9/09708G03G9/09716G03G9/09725
Inventor 今村阳介
Owner KK TOSHIBA
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