JPH02207274A - 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. Disperse Yellow 160 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 U.S. Patent No. λ297A9/, Special Publication Sho'7
Publication No. 2-23910 and Special Publication No. 113-λ/I-7
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, pressure, solvent vapor, etc. It is something to do.

In addition, in recent years, it has become possible to form an electrostatic latent image of the document by exposing it to spectral light, and then develop the image with colored toners of each color to obtain a colored copy image, or to overlay the copy images of each color. At the same time, a method of color copying to obtain full-color copied images 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. t
ing.

The toner used is particles made by dispersing colorants such as dyes and pigments in resin such as polyester and finely pulverized to about 30 μm.Such toner is made of glass beads, 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 be durable with little deterioration due to repeated and continuous use.

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 quite difficult to satisfy all of the above required characteristics, so there is a constant demand for improvements to toners. It is.

[Means for solving problems]

The present invention was made based on the above circumstances, and its purpose is to provide a material that satisfies the above-mentioned required properties in a well-balanced manner, and in particular has 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 properties.

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.

The present invention relates to a yellow toner characterized by containing a compound.

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

The yellow toner of the present invention contains C, 1, D in the binder resin.
It is characterized by containing a compound classified as isperse Yellow/Otsu 0.

C, I, Di 5perse Y used in the present invention
The compound classified as el low/O is a dye having a quinoline skeleton, and the specific trade name is D.
Yellow HuG C Mitsubishi Kasei], etc. The amount of these additives to be added is preferably in the range of 0.7 to 20 parts by weight, and particularly preferably in the range of 7 to 70 parts by weight, based on 700 parts by weight of the resin as the raw dye.

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. With colorant, C, 1, Disperse Yellow /
It is also possible to mix colors by appropriately adding seven or more types of compounds other than compounds classified as Ao.

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 fruit resins such as polystyrene, styrene-acrylic acid ester copolymer, styrene-methacrylic acid ester copolymer, and styrene-butadiene copolymer, vinyl chloride resin, polyethylene, and polypropylene can be exemplified. , 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 alkylsalicylic acid are used, while when obtaining a positively chargeable toner, quaternary ammonia can be used without impairing the properties of the toner. This is preferable because it can impart sufficient chargeability to the toner.

1; In addition, in the yellow toner 1 of the present invention, a fluidity improver such as colloidal silica is added at 0.0/~7wt to the toner.
% may be added.

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.

The above carrier has a particle size of 0 to 0. Conventionally known materials such as iron powder and ferrite powder with a diameter of about 200 μm can be used. Moreover, those coated with a silicone resin, an acrylic resin, a fluororesin, or a mixture of these resins on the surface of the tongs can also be suitably used. A suitable mixing weight ratio of carrier and toner is 100:/-10.

The E-Low toner of the present invention can be manufactured by various manufacturing methods including conventionally known methods. Examples of numerical manufacturing methods include the following.

■ Uniformly disperse the resin and colorant (additives such as a reverse 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 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.

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

one! As a method completely different from the above-mentioned production method, for example, production by suspension polymerization 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. In addition, in each example and comparative example, simply "
The terms "parts" and "parts by weight" are also expressed as "parts by weight."

Example/Styrene/n-butyl acrylate copolymer (monomer g/, 2, weight average molecular weight: ooooo) 700 parts Diaresin Yel], ow II-L, 2G
5 parts Charge control agent (chromium complex of 3,S-ditaneyalyptylsalicylic acid) 7 parts The above-prescribed materials were melt-kneaded in a hot roll mill, cooled, and coarsely pulverized in a hammer mill, and then crushed by an air jet. It was pulverized using a pulverizer according to the method. The obtained fine powder was classified to have a particle size of 5 to 20 μm, which was used as a toner.

Hydrophobic silica R97,2 (trade name, Nippon Aerosil) was added to the toner particles using a Henschel mixer.
5wt5 was added externally to obtain a yellow toner.

Carrier (ferrite powder coated with silicone resin with an average particle size of about 700 μm) 97
The components were mixed in a V-blender to prepare a developer (negatively chargeable).

This developer was used in a dry copying machine with a commercially available selenium photoreceptor under normal temperature and normal humidity environment (2s'G, 6°% RH).
We conducted a continuous live-action test. As a result, it was found that even after 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'C1g, t
%RH) and conducted a similar continuous photocopying test, it was found that even after 20,000 copies, very clear yellow 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 gooθ) 100 parts Diaresin Yel low H2G
Salt-forming compound of part 3 and naphtholsulfonic acid) 3
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 select particles having a particle size of S to 20 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 size of about 100 μm) was mixed in a blender to prepare a developer (positively chargeable).

Using this developer, a continuous copying test was carried out in a dry copying machine using a commercially available organic photoconductor as a photoconductor under normal temperature and normal humidity environment (-Shio C, AO ratio RH).

As a result, it was found that even after printing λoooo sheets, copies with very good spectral reflection characteristics without fog and a clear yellow color were obtained, and the copying properties were excellent.

In addition, this developer was used in a high temperature and high humidity environment (3,t'C1g
, t%RH) and conducted a similar continuous photocopying test, and it was found that even after 20,000 copies, very clear yellow copies with no fogging were obtained, and the printing quality and environmental characteristics were also good.

〔Effect of the invention〕

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

Claims (1)

[Claims] (1) In the binder resin, C. I. DisperseYel
A yellow toner characterized by containing a compound classified as low 160.