JPH02238463A - Electrostatic charge image developing toner - Google Patents

Abstract

PURPOSE:To obtain an electrostatic charge image developing toner high in quality and not causing copy stains due to successive copying by incorporating a compound specified in structure in the toner. CONSTITUTION:The electrostatic charge image developing toner containing at least a resin and a colorant further contains at least the compound represented by formula I in which each of A<1> - A<4> is alkyl, aralkyl, or optionally substituted aryl, preferably, in an amount of 0.1 - 20pts.wt. to 100pts.wt. of the resin, thus permitting the obtained electrostatic charge image developing toner to be high in quality and not to cause copy stains due to successive copying.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a toner for developing electrostatic images used in electronic copying machines and the like.

In the development process, the developer used in electronic copying machines, etc., is once attached to an image carrier K, such as a photoreceptor, on which an electrostatic image is formed, and then is exposed to light in the transfer process. After being transferred from the paper to the transfer paper, it is fixed to the copy paper surface in a fixing step. At that time, the developer for developing the electrostatic charge image formed on the latent image holding surface is a two-component developer consisting of a carrier and toner, and a one-component developer (magnetic toner) that does not require a carrier. It has been known.

Charge control agents such as nigrosine dyes and q-class ammonium salts, carrier coating agents, and the like have been known as agents that impart chargeability to developers.

Problems to be Solved by the Invention> However, these conventional chargeability imparting agents do not necessarily have a sufficient chargeability imparting effect, and in particular, this effect changes over time, resulting in copy stains caused by continuous copying, which deteriorates copy quality. There was a problem in that the value decreased.

Means for Solving the Problems> Therefore, the present inventors conducted intensive studies in order to provide a high-quality toner for developing electrostatic images that is less likely to cause stains on copies, etc. over time. It has been discovered that these problems can be solved by incorporating a compound having this structure into the toner, and the present invention K has been achieved.

That is, the gist of the present invention is to provide an electrostatic image developing toner containing at least a resin and a colorant, which is characterized by containing seven or more types of compounds represented by the following general formula (1). Exists in developing toner.

A2 A4 [In the formula, LA'tA''kA3 and A4 each independently represent an alkyl group, an aralkyl group, or a substituted or unsubstituted aryl group.] The present invention will be described in detail below.

The electrostatic image developing toner of the present invention is characterized in that it contains one or more compounds represented by the following general formula (1).

[In the formula, AI, A! , A3 and A4 each independently represent an alkyl group, an aralkyl group, or a substituted or unsubstituted aryol group. ] In the above general formula (1), AI, A! , A!
and A4 are each independently K methyl group, ethyl group, proyl group, isopropyl group, n-butyl group, inptyl group, te
Alkyl groups such as rt-butyl; aralkyl groups such as penzyl; aryl groups such as phenyl, naphthyl, anthryl, phenanthryl, pyrenyl; or lower alkyl-substituted phenyl, nitro-substituted phenyl, halogen-substituted phenyl Substituted aryl groups such as alkoxy-substituted phenyl group, substituted amino-substituted 7-enyl group, alkoxy-substituted naphthyl group, substituted amino-substituted na-7-enyl group, lower alkyl-substituted anthryl group, lower alkyl-substituted phenanthryl group, lower alkyl-substituted pyrenyl group: represents.

Among the compounds represented by the general formula <1), specific examples of compounds suitable for containing toner K for developing electrostatic images of the present invention include compounds represented by the following structural formula. However, it is not limited to these.

Exemplary compound CHa CH. Although the compound represented by general formula (I) can be used in the present invention regardless of its manufacturing method, one example of a specific manufacturing method will be described below.

The compound represented by general formula (I) is generally, for example, the following general formula (II) and (m) (wherein AI and A2 have the same meanings as in general formula (1)) (
JL;Hs p1j-1F Ichino! (In the formula, A' k A' has the same meaning as in general formula (1)). can get.

As the resin component that can be used in the present invention, various known resin components suitable for toners for developing electrostatic images can be used. For example, styrene resin, styrene acrylic copolymer resin,
There are polyester-based AT resins, epoxy-based resins, mixed resins thereof, and those having a 7-mino group in their alkyl side chains.

The content of the compound represented by general formula (1) in the toner is:
o per 00 parts by weight of resin. i-ao parts by weight are preferred, and more preferably /-/3 parts by weight.

If the content of the compound represented by the general formula (I) is too small, no improvement in charging property can be expected, and if it is excessive, the quality of the toner will deteriorate, which is not preferable.

The coloring agent used in the present invention is not particularly limited as long as it is conventionally used, and carbon plaque or the like is used to obtain a black toner. Also,
The compound represented by the general formula CI) is usually white, so blue,
It may be contained in color toners such as red and yellow. In this case, a colorant consisting of a dye or pigment of the corresponding color is used. The content of the colorant is 3 to 20 parts by weight based on the weight of the resin.
Preferably, it is expressed in parts by weight.

Furthermore, in addition to the compound represented by the general formula (1), the toner of the present invention may contain other charge control agents including known ones, such as nigrosine dye LL & grade ammonium salt, polyamine resin. etc. may be included.

In addition, additives such as a low molecular weight olefin polymer and finely powdered silica may be included as the toner components of the present invention in order to improve fixing properties and fluidity.

The toner can be produced by kneading the above-mentioned components in a kneader or the like, cooling them, and then crushing and classifying them. Furthermore, the toner of the present invention can be applied not only to two-component developers but also to so-called one-component developers (magnetic toners) such as encapsulated toners, polymerized toners, and magnetite-containing toners.

What is the average particle size of toner? -uOμm is suitable. The carrier to be mixed with the toner of the present invention to form a developer is not particularly limited, but iron powder having an average particle size of 10 to 200 μm is preferable. Note that there is no particular restriction on the particle size of the iron powder. In this case, a so-called coated carrier coated with a fluororesin or the like can also be used for the purpose of improving durability during continuous use. Also, ferrite type,
Magnetite-based iron powder can also be used for the housing. These carriers are preferably used in an amount of s-ioo parts by weight per 7 parts by weight of the toner.

EXAMPLES The present invention will now be described in more detail with reference to Examples, but the present invention is not limited to the following Examples as long as the gist of the invention is not exceeded.

In addition, in the following examples, the term "parts" simply means "parts by weight."

Example 1 Nostyrene resin (manufactured by Sanyo Chemical Co., Ltd., trade name SBM-/,0
0) / 0 θ part Carbon plaque (manufactured by Mitsubishi Kasei ■ #1 1 θ part Exemplary Compound (3) 3 parts The above materials were blended and kneaded, and the mixture was pulverized and classified to obtain a black toner having an average particle diameter of // μm.

A developer was prepared by mixing and stirring 5 parts of this toner and 00 parts of a fluororesin-coated carrier having an average particle diameter of about 00 μm. Next, when this developer was actually copied using a copying machine using an organic photoconductor as a photoconductor, it was found that the white background was smudged,
A clear copy with little so-called capri was obtained.

Example 1 The same procedure as in Example 1 was carried out except that g parts of Exemplified Compound (5) was used as a charge control agent in place of 3 parts of Exemplified Compound (3). A good copy was obtained.

Example 7 was repeated except that exemplified compound θI was used in place of 3 parts of exemplified compound (3) as the m-nim charge control agent, and good copies were obtained as in Example 1. It was done.

31L Two parts of Exemplified Compound (Ql-λ) were used instead of 3 parts of Exemplified Compound (3) as a static charge control agent.The same procedure as in Example-/ was carried out, and good copies were obtained as in Example-l. Obtained.

Thickness 1■2l The same procedure as in Example 1l was carried out except that the exemplified compound (3》3 parts of hydroxide and exemplified compound α4) was used as a charge control agent. I got a good copy as well.

Example 6 The same procedure as in Example 1l was carried out except that 3 parts of exemplified compound an was used in place of 3 parts of exemplified compound (3) as a charge control agent. As in Example 1l, good results were obtained. A copy was obtained.

Example 1 As a charge control agent, the same procedure as in Example 1 was carried out except that 3 parts of the exemplified compound (3) and g parts of the exemplified compound (g parts) were used. A good copy was obtained.

m2Δ When a developer was prepared in exactly the same manner as in Example 11 except that Exemplified Compound (3) was not used as a material and used for actual copying, a copy with a lot of fog and poor copy quality was obtained.

Effects of the Invention The toner for developing electrostatic images of the present invention is a high-quality toner for developing electrostatic images that does not cause copy stains or the like due to continuous copying.

Sender: Mitsubishi Kasei Corporation Representative Patent Attorney Hasegawa (other/name)

Claims (1)

[Claims] (1) An electrostatic image developing toner comprising at least a resin and a colorant, which is characterized by containing one or more compounds represented by the following general formula (I). ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・・・・・・・(
I) [In the formula, A^1, A^2, A^3 and A^4 each independently represent an alkyl group, an aralkyl group, or a substituted or unsubstituted aryl group. ]