JPH02210361A - Yellow toner - Google Patents

Abstract

PURPOSE:To obtain superior spectral reflecting characteristics, environmental resistance and durability by incorporating a specified compd. into a binding resin. CONSTITUTION:A compd. represented by formula I is incorporated into a binding resin. The pref. amt. of the compd. added is 0.1-20pts.wt., especially 1-10pts.wt. per 100pts.wt. resin. A compound color may be obtd. by properly adding one or more kinds of colorants other than the compd. represented by the formula I and selected among pigments such as monoazo and disazo pigments and dyes such as anthraquinone and quinoline dyes as a toning means to obtain a desired yellow color. Superior spectral reflecting characteristics, environmental resistance and durability are obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yellow toner particularly suitable for color electrophotography.

[Conventional technology]

Electrophotography is variously disclosed in US Pat. An electrical latent image of electrostatic charge is formed by various means, and then the latent image is developed as a powder image with toner and, if necessary, the powder image is transferred to paper or the like, followed by heating, pressurization, solvent vapor, etc. It is more established than a button.

In addition, in recent years, electrostatic or latent images of originals are formed by exposing them to spectral light, and this is developed with color toner of each color to obtain colored copies, or copies of each color are superimposed. A color copying method for obtaining a full-color copy image has been put into practical use, and color toners such as yellow, magenta, and cyan, which are made by dispersing dyes and/or pigments of each color in a binder resin, have been manufactured. There is.

The toner used is particles made by dispersing coloring agents such as dyes and pigments in resin such as polyester, and finely pulverizing the particles to about 1 to 30 μm. It is used by mixing with a carrier material such as.

[Problem that the invention seeks to solve]

Color toners are required to have the following characteristics, similar to the commonly used black toner.

Excellent triboelectric properties.

Characteristics do not change significantly depending on the environment such as temperature and humidity, that is, there is little environmental dependence.

Durable, with little deterioration due to repeated continuous use.

Furthermore, the following characteristics unique to color toners are also essential.

Good spectral reflection characteristics to faithfully reproduce the original.

Robust against light and hot rolling, and should not fade even if left unused.

Transparency should be dog in order to do multicolor overlays.

Good color mixing properties with toners of other colors.

However, in reality, the properties of toner vary greatly depending on the type and amount of components such as colorants, and it is quite difficult to satisfy all of the above required characteristics, so there is a constant demand for improvements in toner. This is the current situation.

[Means for Solving the Problems] The present invention has been made based on the above circumstances, and its purpose is to satisfy the above-mentioned required characteristics in a well-balanced manner, and in particular, to have good spectral reflection characteristics, environmental resistance characteristics, and The object of the present invention is to provide a yellow toner having excellent properties in terms of durability.

The inventors of the present invention have made extensive studies to achieve the above object, and have discovered that a yellow toner that satisfies the above object can be obtained by incorporating a specific compound into the binder resin, and have arrived at the present invention.

That is, the gist of the present invention resides in a yellow toner characterized by containing a compound represented by the following structural formula (I) in a binder resin.

・・・・・・(I) (for production) The present invention will be explained in detail below.

The yellow toner of the present invention is characterized in that the binder resin contains K and a compound represented by the above structural formula (I).

The compound represented by this structural formula (I) has C,I.

Pigment Yellow g / (C,!,
/I62 / /Body), and its specific product name is Dianova Yellow H/θG [Mitsubishi Kasei] PV-Yellow H/OG (
Hoechst) Lithol Fast Yel
low 099/K (BASF) Lithol
Fast Yellow 0q90 (BA
SF), etc. The amount of these additions is as follows:
0.0 for 10θ weight parts of resin. The content is preferably in the range of / -20 parts by weight, especially in the range of / to io parts by weight.

In addition, as a means of adjusting the color tone to obtain the desired yellow color, other coloring agents may be selected from pigments such as monoazo, disazo, and isoindolinone, and dyes such as anthraquinone, quinoline, and diphenylmethane. Seven or more types of colorants other than the compound represented by the structural formula (I) may be appropriately added to create a color mixture.

On the other hand, the binder resin for the yellow toner of the present invention can be selected from a wide range including known ones. Specifically, styrene resins such as polystyrene, styrene-acrylic acid ester copolymer, styrene-methacrylic acid ester copolymer, and styrene-butadiene copolymer, saturated polyester resin, unsaturated polyester resin, and epoxy resin , phenolic resin, coumaron resin, chlorinated paraffin, xylene resin, vinyl chloride resin, polyethylene and polypropylene, etc.
Two or more of these resins may be mixed and used as appropriate. Among these, it is advantageous to use styrene resins, saturated or unsaturated polyester resins, and/or epoxy resins.

Furthermore, a known colorless charge control agent may be added to the toner of the present invention, if necessary. For example, when obtaining a negatively chargeable toner, metal complexes of salicylic acid or alkyl salicylic acid are suitable, and when obtaining a positively chargeable toner, quaternary ammonium salts and their salt-forming compounds are suitable.
The amount added in the toner is 0. / = k w t % is preferable because sufficient chargeability can be imparted to the toner without impairing the characteristics of the toner.

Further, in the yellow toner of the present invention, a fluidity improver such as colloidal silica is added to the toner at a rate of 0.0/~jw.
It may be added in an amount of about t%.

In addition, cleaning aids such as metal stearate may be added.

The toner of the present invention is preferably mixed with a carrier and used as a two-component developer, but it can also be used as a touchdown type one-component developer.

As the carrier, conventionally known carriers such as iron powder and ferrite powder having a particle size of about 50 to -00 μm can be used. Moreover, those whose surfaces are coated with silicone resin, acrylic resin, fluororesin, or a mixture of these resins can also be suitably used. A suitable mixing weight ratio of carrier and toner is ioo:i to IO.

The yellow toner of the present invention can be manufactured by various manufacturing methods including conventionally known methods, and examples of numerical manufacturing methods include the following.

■ Uniformly disperse the resin and colorant (additives such as a charge control agent may be added if necessary) using a Henschel mixer or the like.

■ Melt and knead the dispersion using a kneader-extor 7 roll mill or the like.

■ After coarsely pulverizing the mixed material using a hammer mill, cutter mill, etc., finely pulverize it using a jet mill, 1-set mill, etc.

■ The finely ground material is classified using a DS (dispersion classifier), zigzag classifier, etc.

■ Depending on the situation, silica or the like is dispersed into the classified material using a Henschel mixer.

Further, as a method completely different from the above-mentioned manufacturing method, for example, manufacturing by suspension polymerization and rolling can be mentioned.

(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to the following examples unless it exceeds the gist thereof. I'm here.

Each example←←Meeting →In all cases, the term “part” means “part”.
"parts by weight".

Example/ Styrene/n-butyl acrylate copolymer (monomer ratio g/2, weight average molecular weight 1I0000)
100 copiesDianova Yellow
H/OQ! Part r: Charge control agent (chromium complex of 3,!-ditertiarybutylsalicylic acid) 1 part The above-mentioned ingredients were melt-kneaded in a hot roll mill, cooled, coarsely ground in a hammer mill, and then finely ground in an air jet method. It was pulverized using a pulverizer. The obtained fine powder is classified to have a particle size of 5 to 20.
The toner was selected by μm.

Hydrophobic silica R? ? , 2 (trade name, manufactured by Nippon Aerosil) using a Henschel mixer at O9.
! A yellow toner was obtained by externally adding rwt%.

To 3 parts of this toner, 97 parts of a carrier (ferrite powder coated with a silicone resin and having an average particle diameter of ioum) was mixed in a blender to prepare a developer (negatively chargeable).

Using this developer, a continuous photocopying test was conducted in a normal temperature and normal humidity environment (23° C., 60% RH) using a commercially available dry copying machine using selenium as a photoreceptor. As a result, it was found that copies with very good spectral reflection characteristics without fogging and a clear yellow color were obtained even after printing OOOO copies, and were found to be excellent in durability.

In addition, this developer was used in a high temperature and high humidity environment (35°C, rs% R
H) and conducted a similar continuous photocopying test, and it was found that very clear yellow copies with no fogging were obtained even after oooo copies, and the environmental characteristics were also good.

Example Polyester resin synthesized from cobisphenol A and terephthalic acid (weight average molecular weight tθθθ)
loo part Lithol Fast Yel
low 099 / K jr part Charge control agent (Hensil) IJ 7" Salt-forming compound of tylammonium chloride and naphthol sulfonic acid) 0 parts Melt and knead the ingredients of the above recipe in a hot roll mill, and after cooling, use a hammer mill. The powder was coarsely pulverized and then finely pulverized using an air-jet type pulverizer.The obtained fine powder was classified to have a particle size of 3 to 20 μm to obtain a yellow toner.

What about the carrier (ferrite powder with an average particle size of 10σμm coated with acrylic resin)? 7 parts were mixed in a V-blender to prepare a developer (positively chargeable).

Using this developer, a continuous photocopying test was conducted in a dry copying machine using a commercially available organic photoconductor as a photoreceptor under normal temperature and normal humidity environment (23° C., 60% RH).

As a result, it was found that even after 20,000 copies, copies with very good spectral reflection characteristics without fog and a clear yellow color were obtained, indicating that the copy had excellent durability.

In addition, this developer was used in a high temperature and high humidity environment (33°C, gr%R
H) and conducted a similar continuous live-action test, but -
Even after 0,000 copies, very clear yellow copies with no fogging were obtained, and the environmental characteristics were also found to be good.

〔Effect of the invention〕

The yellow toner of the present invention satisfies the properties required of a color toner, such as good spectral reflection properties, excellent environmental resistance and durability, in a well-balanced manner.

Claims (1)

[Claims] (1) A yellow toner characterized by containing a compound represented by the following structural formula (I) in a binder resin. ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・・・・( I
)