Unlock instant, AI-driven research and patent intelligence for your innovation.

Toner for electrostatic charge image development

A technology for developing electrostatic images and toners, which is applied in the fields of developers, electrographics, instruments, etc., and can solve the problems of toner agglomeration, reduced heat resistance of binder resins, and difficulty in taking into account the low-temperature fixability and resistance of toners. Heat resistance and other problems, to achieve the effect of heat resistance inhibition

Inactive Publication Date: 2019-10-22
KONICA MINOLTA INC
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the plasticization proceeds, the heat resistance of the binder resin decreases, and therefore, for example, when the toner is stored in a state where heat is applied in a developing machine, the toner tends to aggregate
Therefore, it is difficult to achieve both low-temperature fixability and heat resistance (heat preservation) of the toner

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Toner for electrostatic charge image development
  • Toner for electrostatic charge image development
  • Toner for electrostatic charge image development

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0193] [Manufacture of toner particle 1]

[0194] 0.6 parts by mass of hydrophobic silica particles (HMDS treatment, degree of hydrophobicity: 72%, number average primary particle size: 20nm), 0.50 parts by mass of strontium titanate microparticles A1 (R A : 40nm), and 0.33 parts by mass of strontium titanate particles B1 (R B : 1000 nm) was added to 250 g of toner matrix particles 1 (volume average particle diameter: 5.8 μm), and mixed by a Henschel mixer for 20 minutes to prepare toner particles (1).

Embodiment 2～25 and comparative example 1～5

[0196] [Manufacture of toner particles 2-30]

[0197] In addition to changing the types of toner matrix particles, the types of strontium titanate fine particles (A) and strontium titanate fine particles (B), and the addition ratio (A) / (B) to those shown in Table 4, the In the same manner as the production of Toner Particle 1, Toner Particles 2 to 30 were prepared.

[0198] Types of crystalline polyester resins, types of strontium titanate fine particles (A) and strontium titanate fine particles (B), and particle diameters R contained in the produced toner particles 1 to 30 A or particle size R B , particle shape, and strontium titanate microparticles (A) and strontium titanate microparticles (B) are summarized in Table 4 below.

[0199]

[0200] For each of the above-mentioned toner particles 1 to 30, the low-temperature fixability, heat resistance, and charge amount were evaluated. In addition, the low-temperature fixability and charge amount were measured using the de...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The purpose of the present invention is to provide a toner for electrostatic image development, which has both low-temperature fixability and heat resistance, while suppressing excessive charging. Thetoner for electrostatic charge image development includes a toner base particle containing a binder resin; and an external additive containing a strontium titanate fine particle, wherein the binder resin contains an amorphous resin and a crystalline polyester resin, in which the crystalline polyester resin is a polycondensate of an aliphatic dicarboxylic acid having from 6 to 14 carbon atoms andan aliphatic diol having from 6 to 14 carbon atoms, and the strontium titanate fine particle contains a strontium titanate fine particle (A) and a strontium titanate fine particle (B), in which a particle diameter RA of a peak top in number particle size distribution of the strontium titanate fine particle (A) is smaller than a particle diameter RB of a peak top in number particle size distribution of the strontium titanate fine particle (B).

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic image. Background technique [0002] In recent years, in electrophotographic image forming apparatuses, in order to realize further energy saving for the purpose of increasing the printing speed and reducing the environmental load, there is a need for electrostatic image developing devices capable of heat fixing at relatively low temperatures. Toner (hereinafter referred to as "toner" or "toner particles"). As a method of improving low-temperature fixability, a toner is proposed in which the melting temperature of the binder resin is lowered or the melting temperature of the binder resin is lowered by adding a crystalline material such as a crystalline polyester resin having sharp melting properties as a fixing aid to the binder resin. Melt viscosity, improve low temperature fixability. It is considered that in a toner containing a crystalline material, the binder resin is plast...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087
CPCG03G9/08755G03G9/09708G03G9/08795G03G9/08797G03G9/09725G03G9/09716G03G9/0819G03G9/0827
Inventor 滝浦佑介萱森隆成藤野香樱田育子
Owner KONICA MINOLTA INC