JPS5868047A - Developer - Google Patents

Abstract

PURPOSE:To prevent melt-sticking between particles and deterioration of developer, by using a toner having 4.5-6.5mum number average particle diameter and >=80wt% <=10mum diameter particles, and adding SnO2 type particles as the third component. CONSTITUTION:As a binder resin, 100pts.wt. polystyrene resin, 5pts.wt. nigrosine dye and 6pts.wt. carbon black as colorant are mixed and uniformly dispersed to obtain a toner. For example, 200g toner having 5mum number average particle diameter and 85wt% 0-10mum diameter is used, and 5g SnO2 as the third component is added together with 2,500g carrier and mixed to obtain an electrostatic developing agent. SnO2 has <=10ohm.cm conductivity and renders the surfaces of developer particles consisting of toner and carrier nonadhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Invention (1. Related to Shizuka Bamboo I, I Song A).

If the return image is developed by a mixture of J4C and 14J cutting to form the image 1) method and 1, 1 exactly, Shizuichi Inba]
Law, f1, i, JC, 1 stitch per person, 8 people.

11, ltl, child 11 method as Ql, U.S. Patent No. 2,297,6 (Tsukiyumi 11t6 Samurai Kosho 4223910
Publication No.

1. F Ko II (4324748, published in the official gazette, etc.) is well known, generally v, 1 light
Take advantage of the proboscis It 1.1L stretchy hand t2 & 1) Yz? 4i
Electrically bleed 1℃ at 1°C on a THF small sensitizer, and then develop the 4 ml with a developing agent to obtain a visible image, or if necessary, print it on paper, etc. After transferring the toner powder flj, heat and pressurize.

Alternatively, a visible image can be obtained by fixing with molten W vapor or the like.

Generally, a two-component 3A image agent is composed of toner, toner, and rear. Toner and 17r[, conventionally, colorants (carbon black dyes and pigments, etc.) are completely dispersed in a binder resin such as Borisnarene, and then finely pulverized to about 1 to 30μ particles are used. There is. Such toners are usually mixed with a carrier material such as glass beads, iron powder, or fur and are used to develop the electrical latent image.

1. for these developers. 47N wells (S41
Run.

Improvements were suggested (mostly done). C (However, most of the known current 1ψ milling methods are based on the 151.r defect shown in n14 below).
01) 11、Economics due to continuous use 1. The world,
(J is in U, toner qq child and carrier t) The toner is shattered into small pieces due to the threat c1 of Ryo, part 11. causes deterioration of the melt layer 11 phenomenon on the carrier surface. 4.
The toner particles φλl were very thick throughout the month, and the initial image durability was poor.

E, Ia Ming 1 IF, V$ koru], tO
The image quality is good, and both layers are of good quality.

That is, the number average particle size of toner particles in the developer is 4.511.
m to 6. () If you use a toner particle with a size of 17 μm and 10 μm or more with a diameter of 80 weights or more! J, tlJ If the image quality is 1, you can get 1 @. , Shikashi, this) (Well, as I continued the endurance test, Obi Naotoshi
This results in a poor image with half the image density. Therefore, in the present invention, conductive material particles such as SnO2 are used as a third layer.
It is preferable that the particle ratio of this SnO2nO2-based substance added to the developer as a substance is 10Ω1 or less and the particle size is 2011m or less, and the side stitching into the developer is of]1 to 1? Sukuta (more preferably 0.0
5 to 0.5 degrees in total) is J (I.) These SnO2-based material particles uniformly ionize toner particles of f4fl, resulting in an image with excellent image quality and little change in image density of f17. It will be done.

[Example 1] Polystyrene resin 100 parts Nigrosine dye 5 parts Carbon black 6 parts Toner having the above composition 11b1 number particle size 5 μm 10-1
Toner S220 (1, q
And Sn, 02 costume 5! , carrier 2800,! Mix 1. jDevelopment? When I conducted a long test on NP8500 (Canon Tamaki), I found that it was in the Tano period or C)l (
1,)) Obtained 1 Vλ good picture 1 cheap in Maito. 71. Ta.

[Comparative Example 1] When using a toner having a toner composition similar to that of Example 1, k = 17, toner number average particle diameter of 7.5 μn1, and 01 m to 10 μm η = 70, the initial image t to solid Fl
(1"λ"fchi, side 1 kyu 1woi, odd 1 on medium heat
) There were some images with a bad impression.

Claims (1)

[Claims] lner br's (hard 7 shio to uniform 1 tachi i 5 is 45~6.511
m, and the lTI% of OpmJL is 80 times LL%
The developer containing the above particles and 5nOz particles.