JPH02210364A - Yellow toner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 electronic 4 true method is US Patent No. 2-9769/, Special Publication No. 4'
Publication J-23910 and Special Publication No. 9.7-J+71g
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 heat, pressure, or solvent vapor. be.

In addition, in recent years, an electrostatic latent image of the document is formed by exposing it to spectral light, and this is developed with color toner of each color to obtain a colored copy image. A color copying method for obtaining a copied 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 various colors in a binder resin, have been produced.

The toner used is particles made by dispersing coloring agents such as dyes and pigments in a resin such as polyester and pulverizing them into particles of about 1 to 30 μm.Such toners are 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]

Similar to the commonly used black toner, color toners are required to have the following properties.

Excellent triboelectric properties.

The υ 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, that is, it should be durable for continuous parts that are repeatedly used.

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

Good spectral reflection characteristics to faithfully reproduce the original.

It is 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 improvements in toners. is the current situation.

[Means for solving problems]

The present invention was made based on the above circumstances.1.
The purpose is to provide a yellow toner 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.

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 is that the binder resin contains the following formula (
A yellow toner characterized by containing a compound represented by I).

[In the formula, and f represent a hydrogen atom, an alkyl group having 1 to 1 carbon atoms, or an alkoxy group having 1 to 1 carbon atoms, and M represents calcium, barium, or strontium. ] [Function] The following is a detailed explanation of the present invention.

The yellow toner of the present invention has the general formula (
It is characterized by containing the compound represented by I).

Note that among the substituents in the compound represented by formula (I), the alkyl group is preferably a methyl group or an ethyl group, and the alkoxy group is preferably a methoxy group or an ethoxy group.

Specific examples of the compound represented by formula (I) include:
For example, C1, Pigment Yellow Is / (
tK/JggO) (Product name) He1io Fast Yellow Toner 4
B (Bayer) lrgalite YellowWs
c (Geigy) C1, Pigment Yel
low bl: / (A i3gtro:i)C,
I-Pigment Yellow A (A/J
9'IO) (Product name) Irgafiner YellowRL (Geigy
) Irgalite Yellow WSR (Geigy)
C, 1, Pigment Yellow low / 3 J
(Product name) Shimura Lake Fast Yellow 6G [Dainippon Ink Chemical Co., Ltd.] C1, Pigment Yellow / 69 (Product name) Lionol Yellow K-CoR [Toyo Ink Co., Ltd.] and the like. As for the amount of these additions.

The content of Q is preferably in the range of /-40 parts by weight, particularly preferably in the range of /, 70 parts by weight, based on the weight of the resin.

In addition, as a means for adjusting the color tone to obtain a desired yellow color, one or more of the compounds represented by the general formula CI) may be used in combination, and other colorants, such as monoazo,
Pigments such as disazo and isoindolinone, and anthraquinone.

One or more coloring agents selected from quinoline dyes, diphenylmethane dyes, etc. other than the compound represented by the general formula CI) may be added as appropriate to create a mixed color.

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 S
Examples include T-fat, chlorinated roughin, xylene resin, vinyl chloride resin, polyethylene, and polyglobylene, 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.
The amount added in the toner is 0. / -, t wtl 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 in an amount of 0.01~. yw
You may add about tl.

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 200 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 100:/-10.

The yellow 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 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 silica etc. into the classified material using a Henschel mixer.

In addition, as a method completely different from the above-mentioned production method, for example, production by a suspension polymerization method can be mentioned.

〔Example〕

The present invention will be explained in more detail by way of examples below.
The present invention is not limited to the following examples unless it exceeds the gist thereof. In the description of each example, the term "parts" simply means "parts by weight."

Example 1 100 parts of styrene/n-butyl acrylate copolymer (monomer ratio: weight average molecular weight: 4100OO) He1io Fast Yellow Toner A
B 1 part charge control agent (chromium complex of 3,S-ditertiarybutylsalicylic acid 1 part) The above materials were melt-kneaded in a hot roll mill, cooled, and coarsely pulverized using a hammer mill, and then finely pulverized by an air jet method. Finely ground in a machine.

Classify the obtained fine powder and check the particle size! ~0 μm particles are selected and hydrophobic silica R is applied to the selected toner particles.
A yellow toner was obtained by externally adding 0.3 wt % of Co., Ltd. (trade name, Nippon Aerosil Ring) using a Henschel mixer.

Three parts of this toner was mixed with a carrier (ferrite powder hook portion having an average particle diameter of 10 μm coated with a silicone resin) using a V blender to prepare a developer (negatively chargeable).

This developer was used in a dry copying machine using commercially available selenium as a photoreceptor in a normal temperature and normal humidity environment (J5℃, A o IRH).
A continuous live-action test was conducted under the following conditions.

As a result, even after copying xoooo copies, a copy with very good spectral reflection characteristics, clear yellow color and no capri was obtained, and it was found to be excellent in durability.

In addition, this developer was used in a high temperature and high humidity environment (75℃, t!;
9bFLH) and conducted the same continuous actual retest, and it was found that even after 500 copies, very clear yellow copies with no fogging were obtained, and the environmental resistance properties were also good.O Example Polyester resin synthesized from cobisphenol A and terephthalic acid (weight average molecular weight g000) 100 parts Irgalite YellowWSR! A developer was prepared in exactly the same manner as in Example 1 above, except that the materials used were the same as above, and a continuous photographic test was carried out. went. As a result, even in the case of chairs in normal temperature and normal humidity environments and high temperature and high humidity environments, the chair remains coooo.

Even after actual copying, a clear yellow copy with extremely good spectral reflection characteristics without a decrease in image density or an increase in fog was obtained.

A developer was prepared in exactly the same manner as in Example 1 above, except that Ikko R was used for Lionol Yellow in place of JLI Irgalite Yellow WSR, and a continuous acceptance test was conducted. As a result, in both normal temperature and normal humidity environments and high temperature and high humidity environments, it is comfortable.

A clear yellow copy with extremely good spectral reflection characteristics was obtained without any decrease in image density or increase in capri after actual copying.

Polyester resin synthesized from Ebisphenol, A and terephthalic acid (weight average molecular weight g000) 10
Part 0 Shimura Rake First Yellow AG
5 parts Charge control agent (salt-forming compound of benzyltributylammonium chloride and naphthol sulfonic acid) 3 parts The above materials 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 select particles with a particle size of 0 to 0 μm, and carrier (ferrite powder coated with acrylic resin with an average particle size of 100 μm) is added to 3 parts of the selected toner particles. 7 parts were mixed using Brengu to prepare a developer (positively chargeable).

Using this developer, a dry copying machine using a commercially available organic photoconductor as a photoreceptor was used in a normal temperature and normal humidity environment (S°C, 60% RH).
), we conducted a continuous live-action test. As a result, 1000
Even after copying 0 sheets, a copy with very good spectral reflection characteristics and a clear yellow color with no capri can be obtained.
It was found to be highly durable.

In addition, this developer was stored in a high temperature and high humidity environment (35℃,
RH) and conducted a similar continuous live-action test,
Even after copying 20,000 copies, very clear yellow copies with no capri were obtained, and the environmental resistance was 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 general formula (I) in a binder resin. ▲There are mathematical formulas, chemical formulas, tables, etc.▼・・・(I) [In the formula, X^1 and X^2 are hydrogen atoms, alkyl groups having 1 to 5 carbon atoms, or alkoxy groups having 1 to 5 carbon atoms. Representation, M
represents calcium, barium or strontium. ]