JP2015018196A - Toner for electrostatic charge image development using colored fluorescent pigment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toner that can be easily dispersed in a binder resin and can provide uniform image quality by using a fluorescent pigment that causes the appearance of three primary colors of colors under visible light and emits three primary colors of light under ultraviolet irradiation, rather than a pigment that is colorless under visible light and emits three primary colors of light under ultraviolet irradiation.SOLUTION: A printed matter printed with a toner using a colored fluorescent pigment can be visually recognized as three primary colors of colors and visually recognized as three primary colors of light under ultraviolet irradiation. The use of an organic fluorescent pigment improves the dispersibility of the pigment in a binder resin.

Description

The present invention relates to an electrostatic charge image developer toner, and in particular, a toner and a toner that have three primary colors of color under visible light and emit light in the three primary colors of light when irradiated with ultraviolet rays It relates to a manufacturing method.

Conventionally, a toner for developing an electrostatic charge image is obtained by adding various additives such as pigments, charge control agents, waxes, silica and other external additives to a binder resin.
As basic pigments, yellow pigments typified by benzimidazolone, quinacridone, carmine 6B, magenta pigments typified by naphthol-based pigments, cyan pigments typified by copper phthalocyanine, and black pigments typified by carbon black are used as basic colors.

Patent Documents 1 and 2 are toners for developing an electrostatic charge image to which a fluorescent pigment is added. However, the fluorescent pigment is generally colorless and emits light in each wavelength region when irradiated with ultraviolet rays. For this reason, the security is very effective.
In addition, there are a wide range of emission wavelengths, and each ultraviolet emission corresponds to the three primary colors of red, green and blue light. The position corresponding to black in the electrophotographic system is composed of four emission colors that emit white fluorescence.

As for the fluorescent pigment, for example, red light emission uses a colorless inorganic pigment under visible light in which Eu is doped in Y2O2S.

JP2007-017718 JP2007-017719

By adding a colored fluorescent pigment as a toner pigment to make it functional, not only conventional hues, but also special applications, for example, having color under visible light but requiring security with light emission corresponding to ultraviolet rays It becomes possible to print with a color laser printer on printed matter, entertainment elements and the like.

Since the colored fluorescent pigment has a small particle diameter and is an organic substance, it has excellent dispersibility with the binder resin, so that coloring under visible light and light emission upon irradiation with ultraviolet light are good without color unevenness.

Light emission by ultraviolet irradiation is magenta, yellow, and cyan, which are the three primary colors corresponding to the three primary colors of light, red, green, and blue, and corresponding to the three primary colors of light under visible light.

An object of the present invention is to provide a toner for developing an electrostatic image having a color without using such conventional colorless fluorescence.

In order to achieve the above object, according to the first aspect of the present invention, 1-50 parts by weight of an organic fluorescent pigment having a magenta color is kneaded in a twin screw extruder together with a polyester resin, a charge control material, and a wax, In order to pulverize to a particle size and perform surface modification as necessary, silica or the like is added (hereinafter, magenta fluorescent toner). 1-50 parts by weight of organic fluorescent pigment in yellow color is subjected to the same treatment as above (hereinafter, yellow fluorescent toner).
For cyan, 0.01 to 10 parts by weight of a fluorescent brightening agent is added to 1 to 10 parts by weight of a copper phthalocyanine pigment, and the same treatment as above is performed (hereinafter, cyan fluorescent toner).
For white, a white pigment is not particularly specified, but 0.01 to 10 parts by weight of a fluorescent brightening agent is added to 1 to 80 parts by weight of titanium oxide, and the same treatment as described above is performed (hereinafter, white fluorescent toner).
The above-mentioned magenta and yellow are not limited to this method, and can be established by a method of adding a fluorescent brightening agent to magenta and yellow pigments.

As described above, the toner according to claim 1 can be produced by kneading, pulverization, and external addition, which are normal toner preparation methods, and is a primary color of three colors under visible light. It becomes possible to have.

The organic fluorescent pigment according to claim 2 of the present invention has good compatibility with the binder resin and enables uniform printing without unevenness of the printing surface.

The third aspect of the present invention makes it possible to emit light by adding a fluorescent whitening agent to a conventional toner pigment that is blue and colorless under visible light, which is difficult to achieve with organic fluorescent pigments.

It shows the reflectance for each wavelength of magenta, yellow, and cyan, which are the three primary colors under visible light. A spectrophotometer manufactured by JASCO Corporation is used as the measuring device. It shows the intensities for each wavelength of red, green, blue and colorless under visible light, which are the three primary colors of light when irradiated with 365 nm long wavelength ultraviolet light. As the measuring device, a luminance / illuminance automatic mapping measuring device was used.

The reflectance under visible light of the colored fluorescent toner according to the embodiment of the present invention is shown in FIG. As a production method, 1 to 50 parts by weight of a colored fluorescent pigment as a pigment is added to a toner additive such as a polyester resin, a charge control agent, and wax. However, it is not limited to this, but 10 parts by weight or less is preferable. The above material is kneaded by applying heat and load at a predetermined cylinder temperature using a twin screw extruder (PCM43 manufactured by Ikegai Co., Ltd.). After kneading, coarse pulverization to about 1-2 mm as pre-grinding. The coarsely pulverized product is pulverized to a predetermined particle size of 7 to 10 μm by an airflow pulverizer (I-type pulverizer manufactured by Nippon Pneumatic Co., Ltd.). The particle diameter is not limited to this. Furthermore, an external additive typified by silica is added to modify the surface (Henschel mixer manufactured by Mitsui Mining Co., Ltd.). The toner obtained through the above steps is referred to as a colored fluorescent toner.

Hereinafter, the present invention will be described in more detail with reference to examples. In the examples, “parts” are based on mass unless otherwise specified.

First, as Example 1, a method for producing a magenta fluorescent toner that can visually confirm a magenta color under visible light and emits red light when irradiated with 365 nm long wavelength ultraviolet rays will be described.

1. 100 parts by weight of polyester resin2. 2. Magenta fluorescent pigment (SX-1037, manufactured by Sinloihi) 10 parts by weight 2. 2 parts by weight of wax Charge control agent 2 parts by weight or more and 4 types of materials were premixed with a mixer, and then kneaded while applying temperature with a biaxial extrusion kneader.

The obtained kneaded material was pelletized with a drum flaker, and the pellet was pulverized to about 2 mm with a feather mill.

The obtained pulverized product of about 2 mm was further pulverized to a small particle size with an airflow pulverizer, and classified to a target particle size.

Thereafter, silica particles or the like (3-4 parts by weight with respect to the kneaded product) surface-treated with silicon oil or silane coupling are mixed with the kneaded and pulverized product with a Henschel mixer, and passed through a sieve to obtain a magenta fluorescent toner. It was.

The obtained magenta fluorescent toner was mounted on a toner cartridge of a laser printer and printed. With respect to the obtained printed matter, the wavelength under visible light and long wavelength ultraviolet irradiation was measured.

The magenta color under visible light had a wavelength peak around 640 nm as shown in FIG. 1, and became around 600 nm under 365 nm long wavelength ultraviolet irradiation, as shown in FIG.

As a second embodiment, a method for producing a yellow fluorescent toner that can visually confirm a yellow color even under visible light and emits green light when irradiated with 365 nm long wavelength ultraviolet rays will be described.

1. 100 parts by weight of polyester resin2. 2. Yellow fluorescent pigment (SX-1005, manufactured by Sinloihi) 10 parts by weight 2. 2 parts by weight of wax Charge control agent 2 parts by weight or more and 4 types of materials were premixed with a mixer, and then kneaded while applying temperature with a biaxial extrusion kneader.

The obtained kneaded material was pelletized with a drum flaker, and the pellet was pulverized to about 2 mm with a feather mill.

The obtained pulverized product of about 2 mm was further pulverized to a small particle size with an airflow pulverizer, and classified to a target particle size.

Thereafter, silica particles and the like (3-4 parts by weight with respect to the kneaded product) surface-treated with silicon oil or silane coupling are mixed with the kneaded and pulverized product with a Henschel mixer, and passed through a sieve to obtain a yellow fluorescent toner. It was.

The obtained yellow fluorescent toner was mounted on a toner cartridge of a laser printer and printed. With respect to the obtained printed matter, the wavelength under visible light and long wavelength ultraviolet irradiation was measured.

The yellow color under visible light has a reflectance peak on the blue side as shown in FIG. 1, and is constantly around 80%. For that reason, it has a blue color with a bluish tint. As shown in FIG. 2, green emission was obtained at around 510 nm under 365 nm long wavelength ultraviolet irradiation.

As a third embodiment, a method for producing a cyan fluorescent toner that can visually confirm a cyan color under visible light and emits blue light when irradiated with 365 nm long wavelength ultraviolet rays will be described.

1. 100 parts by weight of polyester resin2. 2. 2 parts by weight of cyan pigment Optical brightener 1 part by weight4. 2. 2 parts by weight of wax Charge control agent 2 parts by weight or more and 5 types of materials were premixed with a mixer and then kneaded while applying temperature with a biaxial extrusion kneader.

The obtained kneaded material was pelletized with a drum flaker, and the pellet was pulverized to about 2 mm with a feather mill.

The obtained pulverized product of about 2 mm was further pulverized to a small particle size with an airflow pulverizer, and classified to a target particle size.

Thereafter, silica particles or the like (3-4 parts by weight with respect to the kneaded product) surface-treated with silicon oil or silane coupling are mixed with the kneaded and pulverized product with a Henschel mixer and passed through a sieve to obtain a cyan fluorescent toner. It was.

The obtained cyan fluorescent toner was mounted on a toner cartridge of a laser printer and printed. With respect to the obtained printed matter, the wavelength under visible light and long wavelength ultraviolet irradiation was measured.

The cyan color under visible light was around 470 nm as shown in FIG. 1, and it was around 440 nm as shown in FIG.

As Example 4, a method for producing a white fluorescent toner that can be confirmed to be colorless under visible light and emits pale blue light when irradiated with 365 nm long wavelength ultraviolet rays will be described.

1. 100 parts by weight of polyester resin2. 2. 50 parts by weight of white pigment Optical brightener 1 part by weight4. 2. 2 parts by weight of wax Charge control agent 2 parts by weight or more and 5 types of materials were premixed with a mixer and then kneaded while applying temperature with a biaxial extrusion kneader.

The obtained kneaded material was pelletized with a drum flaker, and the pellet was pulverized to about 2 mm with a feather mill.

The obtained pulverized product of about 2 mm was further pulverized to a small particle size with an airflow pulverizer, and classified to a target particle size.

Thereafter, silica particles and the like (3-4 parts by weight with respect to the kneaded product) surface-treated with silicon oil or silane coupling are mixed with the kneaded pulverized product with a Henschel mixer, and passed through a sieve to obtain a white fluorescent toner. It was.

The obtained white fluorescent toner was mounted on a toner cartridge of a laser printer and printed. With respect to the obtained printed matter, the wavelength under visible light and the wavelength at the time of long-wavelength ultraviolet irradiation were measured.

It was colorless under visible light, and as shown in FIG. 2, under the irradiation of 365 nm long wavelength ultraviolet rays, there was a wavelength band near the same blue color, and blue-white light emission was obtained with a broad wavelength.

The inventions of claims 1 to 3 can be used for printing in color and security (copying prevention, etc.). It can also be used effectively for texture printing.

Claims (3)

For developing electrostatic images, which are magenta, yellow, cyan, and colorless, which are the three primary colors under visible light, and emit light to the three primary colors red, green, blue, and white (blue-white) when irradiated with ultraviolet light. Colored fluorescent toner Colored fluorescent toner for developing electrostatic images, wherein the fluorescent pigments are organic colored magenta and yellow, and emit light in red and green, respectively, when irradiated with ultraviolet rays. A colored fluorescent toner for developing electrostatic images, which contains copper phthalocyanine as a cyan pigment and titanium oxide as a white pigment, and further adds a fluorescent brightening agent and emits ultraviolet light. A colored fluorescent toner for developing electrostatic images that emits ultraviolet light by using a magenta pigment or a yellow pigment and adding a fluorescent brightening agent for magenta and yellow colors.