JPH02207273A - yellow toner - Google Patents

Abstract

PURPOSE:To obtain a yellow toner having satisfactory spectral reflecting characteristics, superior environmental resistance and durability by incorporating a specified compd. into a binder resin. CONSTITUTION:A compd. belonging to C.I. Solvent Yellow 112 is incorporated into a binder resin. This compd. is a dye having a quinoline skeleton and is incorporated by 0.1-20pts.wt., preferably 1-10pts.wt. per 100pts.wt. resin. The binder resin can be selected among various kinds of resins and polystyrene or a styrene-acrylate copolymer may be used. A yellow toner having satisfactory spectral reflecting characteristics, superior environmental resistance and durability is 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]

The electrophotographic method is described in US Pat.
The latent image is developed as a powder image with toner, and if necessary, the powder image is transferred to paper or the like, and then fixed by heating, pressurization, solvent vapor, etc. It is something to do.

In addition, in recent years, electrostatic latent images of documents are formed by exposing them to spectral light, and this latent image is developed with color toners of each color to obtain colored copies, or copies of each color are superimposed. A method of color copying to obtain full-color copied images has been put into practical use.Color toners such as natural yellow, magenta, and cyan are produced by dispersing dyes and/or pigments of each color in a binder resin as color toners for use in kneading and kneading. has been done.

The toner used is particles made by dispersing coloring agents such as dyes and pigments in resin such as polyester and finely pulverized to about 30 μm.Such toners are made of glass peas, iron powder, or It is used by mixing with a carrier material such as fur.

[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.

・It should have little deterioration with repeated continuous use, that is, it should be durable.

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

・Spectral reflection characteristics must be good in order to faithfully reproduce the original.

- Robust against light and heat and does not fade even if left unused.

・High transparency for multicolor overlay.

- Good color mixing properties with toners of other colors.

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

[Means for solving problems]

The present invention was developed based on these circumstances, and its purpose is to satisfy the above-mentioned required properties in a well-balanced manner, and in particular, to have good spectral reflection properties and excellent environmental resistance and durability. An object of the present invention is to provide a yellow toner having the following characteristics.

Therefore, the present inventors conducted extensive studies to achieve the above object, and as a result, they discovered that by incorporating a specific compound into the binder resin, a yellow toner that satisfies the above object could be obtained, resulting in the present invention. did.

That is, the gist of the present invention is that C,1,5
Olvent Yellow / / , classified as 2
The present invention relates to a yellow toner characterized by containing a compound that

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

The yellow toner of the present invention contains C,1,5 in the binder resin.
It is characterized by containing a compound classified as "olvent Yellow / / 2".

C used in the present invention, 1.5olvent Yellow
Compounds classified as w //, 2 are dyes with a quinoline skeleton, and the specific trade name is Diare.
Examples include sin Yellow HC [Mitsubishi Kasei]. The amount of these additives to be added is 0.7 to 0.7 to 700 parts by weight of the resin. The range of 20 parts by weight is good, especially 7 to 1
It is preferable to contain it in a range of 0 parts by weight.

In addition, as a means of adjusting the color tone to obtain the desired yellow color, other coloring agents selected from monoazo-based, disazo-based, isoindolinone-based pigments, and anthraquinone-based, quinoline-based, diphenylmethane-based dyes, etc. may be used. Seven or more colorants other than the compound represented by formula (1) may be added as appropriate 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 , phenol resin, coumaron resin, iA dioxidized paraffin, quinoa resin, vinyl chloride resin, polyethylene, and polypropylene, and two or more of these resins may be used in combination 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.
It is preferable that the amount added be in the range of 0.7 to 3 wt % in the toner, since sufficient chargeability can be imparted to the toner without impairing the characteristics of the toner.

Further, the yellow toner of the present invention contains a fluidity improver such as colloidal silica with respect to the toner at 0, O/~, ? lol
It may be added to the extent of 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 with a particle size of about 50-aoo .mu.m 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 100:/~/θ.

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-extruder, roll mill, etc.

■ After coarsely pulverizing the kneaded material with a hammer mill, cutter mill, etc., finely pulverizing it with a jet mill, 1-type mill, etc.

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

■ If necessary, disperse the warping force into the classified material using a Henschel mixer, etc.

Further, as a method completely different from the above-mentioned manufacturing method, for example, a suspension polymerization method is widely used.

(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. In addition, in each actual sister example and comparative example, "
All references to "parts" refer to "parts by weight."

Example/ Styrene/n-butyl acrylate copolymer (monomer ratio g/2, weight average molecular weight yoooo) 100 parts Diaresin Yellow HCA; Part Charge control agent (chromium complex of 3,S-ditaneyabutylsalicylic acid) 7 parts The above materials were melt-kneaded using a hot roll mill, cooled, and then coarsely ground using a hammer mill, and then finely ground using an air jet type pulverizer.

The obtained fine powder was classified to have a particle size of S to 0 μm, and a toner was obtained.

Hydrophobic silica 897.2 (trade name, manufactured by Nippon Aerosil) was added to the toner particles using a Henschel mixer.
A yellow toner was obtained by externally adding 5wtZ.

To 3 parts of this toner, 97 parts of carrier (ferrite powder coated with silicone resin and having an average particle diameter of about θ0 μm) was mixed in a V-blender to prepare a developer (negatively chargeable).

Using this developer, a continuous copying test was conducted in a normal temperature and normal humidity environment (2 parts C, AO% RI-1) using a commercially available dry copying machine using selenium as a photoreceptor. As a result, it was found that even after 10,000 copies, copies with very good spectral reflection characteristics without fogging and a clear yellow color were obtained, and the copies were excellent in durability.

In addition, this developer was used in a high temperature and high humidity environment (5'C).

gs%RH) and conducted a similar continuous photocopying test, it was found that even after 200 copies, very clear yellow-colored copies with no fogging were obtained, and the environmental characteristics were also good.

Example λ Polyester resin synthesized from bisphenol A and terephthalic acid (weight average molecular weight gooo) 100 parts Diaresin Yellow HCj part Charge control agent (salt-forming compound of benzyltributylammonium chloride and naphthol sulfonic acid) 3 parts The materials were melt-kneaded using a hot roll mill, cooled, and then coarsely ground using a hammer mill, and then finely ground using an air-jet type pulverizer.

The obtained fine powder was classified to have a particle size of S to λ0 μm to obtain a yellow toner.

To 3 parts of this toner, 97 parts of carrier (ferrite powder coated with acrylic resin and having an average particle diameter of θ0 μm) was mixed in a blender (2) to prepare a developer (positively chargeable).

Using this developer, a dry copying machine using a commercially available organic photoconductor as a photoreceptor is used in a normal temperature and normal humidity environment (z, r'C).

A continuous live-action test was conducted under conditions (60% RH).

As a result, it was found that even after 1.20,000 sheets were printed, copies with very good spectral reflection characteristics without fogging and a clear yellow color were obtained, and were excellent in durability.

In addition, this developer was used in a high temperature and high humidity environment (35°C, g s
% RH) and conducted the same continuous live copying test, it was found that even after 20,000 copies, extremely clear color copies with no fogging were obtained, and it also has excellent environmental resistance and durability, making it a good color toner. It fully satisfies the required characteristics in a well-balanced manner.

Claims (1)

[Claims] (1) In the binder resin, C. I. SolventYell
A yellow toner characterized by containing a compound classified as OW112.