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

Surface-modified non-magnetic mono-component color toner with improvements in background contamination and transfer efficiency and method of preparing the same

A color toner, one-component technology, applied in the direction of developer, electrography, optics, etc., can solve the problems of poor fixability, background pollution, image pollution, etc.

Inactive Publication Date: 2009-12-23
LG CHEM LTD
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, problems such as increased amount of fine particles, low toner chargeability, strong adhesion of fine particles to latent electrostatic image carrier, filming, or poor fixability may occur
In particular, due to high environmental sensitivity of silica particles, it may cause problems such as image contamination under environmental conditions of low temperature and low humidity and background contamination under environmental conditions of high temperature and high humidity

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
  • Surface-modified non-magnetic mono-component color toner with improvements in background contamination and transfer efficiency and method of preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Preparation of Magenta Toner Core Particles

[0066] Combine 92 parts by weight of polyester resin (M.W.: 2.5×10 4 ), 5 parts by weight of Quinacridone Red 122, 5 parts by weight of styrene acrylate used as a resin-type charge control agent (CCA) and 2 parts by weight of low molecular weight polypropylene are mixed in a Henschel mixer . The resulting mixture was melted and kneaded at 155°C using a twin-screw melt kneader (twin-screwmelt kneader), crushed into fine particles using a jet mill pulverizer, and an air jet classifier was used. ) Classification to obtain toner core particles having a volume average particle diameter of 8 μm.

[0067] Preparation of spherical toner particles

[0068] The toner core particles can be spheroidized by mechanical or thermal surface modification. In this embodiment, the toner core particles prepared in are mechanically spheroidized using 2 parts by weight of styrene acrylate as the resin type CCA. At this time, spheroidization was...

Embodiment 2～64

[0072] Except for spheroidizing with a charge control agent (surface modification) and then coating with spherical organic powder, silica and titanium dioxide described in Table 1 below, a non-magnetic monomer was prepared in the same manner as in Example 1. Component color toner.

[0073] Table 1

[0074]

Item

Spheroidization

CCA

The first spherical organic powder

Second spherical organic powder

Silica

TiO 2

Example 2

0.6

SA

0.5pbw

60nm PMMA powder 0.8pbw

800nm PMMA powder 1.5pbw

6nm silica

2.5pbw

500nm TiO 2

4.0pbw

Example 3

0.6

SA

0.5pbw

60nm PMMA powder 0.8pbw

800nm PMMA powder 1.5pbw

6nm silica

2.5pbw

800nm TiO 2

2.0pbw

Example 4

0.6

SA

0.5pbw

60nm PMMA powder 0.8pbw

800nm PMMA powder 1.5pbw

6nm silica

2.5pbw

800nm TiO 2

4.0pbw

Example 5

0.6

S...

experiment Embodiment 1

[0099] A commercially available non-magnetic one-component developing printer (HP2600, Hewlett-Packard) was used to print 3000 sheets of paper in the following contact developing mode. According to the printing situation, the evaluation was prepared in Examples 1 to 64 and Comparative Examples 1 to 63 The image density, image contamination, transfer efficiency, long-term stability and background contamination of the color toner. The results are summarized in Table 3 and Table 4 below.

[0100] 1) Image density

[0101] Such as figure 1 As shown, the toner density at nine locations of a solid area image is measured, and the average value thereof is defined as the image density, which is a key factor in determining the long-term image retention ability.

[0102] The image density is measured by a Macbeth Reflective Densitometer (RD918) and evaluated based on the following four levels:

[0103] A: The image density is greater than 1.30

[0104] B: The image density is 1.0~1.3

[010...

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 sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

Provided is a non-magnetic mono-component color toner with improved charge properties by surface modification with a charge control agent. The color toner is prepared by spheroidizing toner core particles including a binder and a colorant in the presence of 0.5 to 3 parts by weight of a charge control agent and coating the resultant spherical toner core particles with a first spherical organic powder with an average particle size of 50 to 120 nm, a second spherical organic powder with an average particle size of 600 to 1,000 nm, silica with an average particle size of 5 to 20 nm, and titanium dioxide with an average particle size of 300 to 1,000 nm. The color toner exhibits excellent surface charge properties (e.g., a narrow charge distribution, high chargeability, and good charge maintenance capability), thereby ensuring low image / background contamination, high transfer efficiency, good image density and long-term stability.

Description

Technical field [0001] This application claims to benefit from the priority of Korean Patent Application No. 10-2008-0056542 filed with the Korean Intellectual Property Office on June 16, 2008, the disclosure of which is incorporated herein by reference. [0002] The present invention relates to a non-magnetic one-component color toner, and more specifically, to a non-magnetic one-component color toner with improved background pollution and transfer efficiency and a preparation method thereof. In the presence of the control agent, the toner core particles are spheroidized by using mechanical or heat treatment methods to ensure that the charge control agent is sufficiently and uniformly dispersed on the surface of the toner core particles, and further, through appropriate Ground coating of spherical inorganic powders with different particle diameters, so as to ensure a narrow charge distribution, high charge rate and good charge retention performance. Background technique [0003]...

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): G03G9/097
CPCG03G9/08708G03G9/0924G03G9/09708G03G9/0827G03G9/0819G03G9/09725G03G9/0906G03G9/09733G03G9/08711G03G9/09783G03G9/08
Inventor 李昶淳李炯镇程在植
Owner LG CHEM LTD