JPS6015647A - Color toner - Google Patents

Abstract

PURPOSE:To obtain a color toner applicable to an overhead projector by elevating the melt index of a toner. CONSTITUTION:A color toner (1) contg. a resin binder and a dye and applicable to vapor phase transfer to a transparency contains a dye especially compatible with the binder resin to obtain a melt flow index of 1.5-20.0, and a ratio of the value of this toner (1) to that of the base material (2) in the case of contg. no dye is regulated to 1.0-10.0. A preferable proportion of the dye to the binder resin is 0.1-20 to 100 by weight. Polystyrene, a styrene-acrylate copolymer, etc. are used for the binder resin, and sublimable dyes subliming at 100-250 deg.C, such as ''Kayalon Fast Yellow 4R'', ''Kayalon Fast Rubin B'', etc. are used as the dye.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a toner for developing electrostatic images in electrophotography, electrostatic recording, electrostatic printing, etc., and particularly relates to a color toner.

Conventionally, as an electrophotographic method, U.S. Patent No. 2.297.69
Although many methods are known, as described in Japanese Patent Publication No. 1, Japanese Patent Publication No. 42-23910, and Japanese Patent Publication No. 43-24748, etc., they generally utilize photoconductive substances and perform various methods. forming an electrical latent image on the photoreceptor by means;
The latent image is then developed using toner, and if necessary, the toner image is transferred to a transfer material such as paper, and then fixed by heat, pressure, solvent vapor, or the like to obtain a copy.

The electronic printing method, as proposed in Japanese Patent Publication No. Sho 42-14342, is a method of guiding and fixing a charged powder toner onto a recording material using an electric field for printing.

The electrostatic recording method is a method in which charges are applied to a dielectric layer in the form of an image, and charged toner powder is attached and fixed thereon, and the magnetic printing method similarly forms a magnetic latent image on a recording material. This is a method of developing this with toner powder containing a magnetic material, transferring it to a transfer material, and fixing it.

Various developing methods are known for visualizing such electrical or magnetic latent images using toner, and they can be broadly classified into dry developing methods and wet developing methods. The former method is further divided into a method using a two-component developer using carrier particles and a method using a single-component developer not using carrier particles.

Among the two-component developing methods, widely used methods include a magnetic brush method using an iron powder carrier, a cascade method using a gear carrier, etc., depending on the type of carrier for conveying the toner.

On the other hand, various development methods using a one-component developer consisting only of toner have been proposed, and among them, many excellent methods using magnetic toner have been put into practical use. As developing methods using magnetic-component developers, there have been proposed the MagneDry method using conductive toner, the method using dielectric polarization of toner particles, the charge transfer method using toner disturbance, and the like. However, in recent years, as a developing method proposed by the present applicant, there are
A method of developing a latent image by flying toner particles, such as that disclosed in Japanese Patent No. 8656, has been put into practical use.

Recently, the purposes for which the above-mentioned t-child photographs and the like are used have become diverse, and there is a demand for a compact and inexpensive color copying machine that can produce images of desired colors as needed.

However, when conventional color toners are heat-fixed, the current situation is that only very unsatisfactory colors can be obtained, especially when applied to OHP. The reason for this is that since the toner particles on the transbearing range remain particulate even after heat fixing, when applied to OHP, light is not only absorbed by the toner particles, but also undergoes reflection and refraction. □The main cause is that the amount of light decreases and it becomes dark in the entire visible light range.0 As a result of intensive studies by the present inventors in order to improve the above properties, the present inventors found that at least the binder resin and the dye The melt flora index (MI
It has been found that color toners with improved properties described above can be obtained by increasing the color toner properties.

That is, the purpose of the present invention is 1. It is an object of the present invention to provide a color toner that has further improved properties as described above and can produce images with vivid colors.

Furthermore, it is an object of the present invention that the manufacturing process is simple and inexpensive.
Our goal is to provide color toner.

A further object of the present invention is to provide a color toner with even better developability, transferability, and fixability.

Furthermore, it is an object of the present invention to
).An object of the present invention is to provide a color toner that can be applied to vapor phase transfer of dyes to.

The present invention is characterized by a color toner (1) containing at least a binder resin and a dye.

By containing a dye that is particularly compatible with the binder resin, MI value 1): 1.5 to 20.0 (
Preferably 20 to 15.0), and the base material (n) containing no dye has an MI value ratio I/n of 1.0.
to 100 (preferably 1.5 to 6.0).

The method for measuring the MI value of the present invention is carried out in accordance with method A of JIS standard 7210. However, the measurement conditions are a temperature of 125℃ and a load of 10kl. It is measured in

The reason why the MI value is in this range is because if the MI value is too small, the fluidity during heat fixing will not be sufficient and the toner will exist in the form of particles, making it impossible to obtain a clear color image. If it is larger than this, problems such as offset and wrapping will occur during heat fixing.

The color toner in the present invention contains at least a binder resin and a dye, and the composition ratio thereof is 0.1' to 20 heavy parts (preferably 10 parts by weight) of the dye to 100 parts by weight of the binder resin.
~15 parts by weight) to increase the MI value from 1.5 to 20.0.
(preferably 2.0 to 15.0), and if necessary, 20 to 120 parts by weight of magnetic powder (preferably 40 to 80 parts by weight), 0.1 part of colloidal silica
~2.0 parts by weight (preferably 0.2 to 1.0 parts by weight),
Conductive fine particles 0.01 to 5 parts by weight (preferably 0.05 parts by weight)
~2 parts by weight) may be added.

The binder resin used in the present invention is polystyrene, ?
Homopolymers of styrene and its substituted products, such as P-chlorostyrene, polyvinyltoluene, styrene-P-chlorostyrene copolymer, styrene-vinyltoluene copolymer, and copolymers thereof, styrene-methyl acrylate copolymer Copolymer of styrene and acrylic acid ester such as styrene-n-butyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-n-methacrylate copolymer
- Copolymers of styrene and methacrylic esters such as butyl copolymers, multi-component copolymers of styrene and acrylic esters and methacrylic esters, other styrene-acrylonitrile copolymers, styrene-vinyl methyl ether copolymers , styrene-based copolymers of styrene and other vinyl monomers, such as styrene-butanoene copolymers, styrene-vinyl methyl ketone copolymers, styrene-acrylonitrile-indene copolymers, and styrene-maleic acid ester copolymers. , polymethyl methacrylate,
Polybutyl methacrylate polyvinyl acetate, polyester, polyamide, engineering resin, polyvinyl butyral, eyes? Known binding substances such as lyacrylic acid, phenolic resin, aliphatic or alicyclic hydrocarbon resin, petroleum resin, and chlorinated tungsten can be used alone or in combination.

Furthermore, as binder resins for toners used in pressure fixing systems, low molecular weight polyethylene, low molecular weight polypropylene, ethylene vinyl acetate copolymers, ethylene vinyl acetate copolymers, ethylene acrylic acid ester copolymers, and higher fatty acids are used. , polyamide resin, polyester resin, etc. can be used alone or in combination.

The dye used in the present invention is compatible with the binder resin and M
Although any dye that increases the I value can be used, it is particularly preferred to use sublimable dyes that can sublime at approximately 100 DEG to 250 DEG C. in view of their applicability to Color HP. For example, Kayalon Fast Yellow 41 (C, 1, 26
090), Kayalon Fast Yellow G (C, 1,
11855), Kayalon First Brown R (C,
1,11100), Kayalon Fast Troupin B (
C, 1, 11115) or above, manufactured by Nippon Kaisha, Miketon First Scarlet B (C, 1, 11110), Miketon First Pink RL (C, 1, 60755), Miketon First Brilliant Blue B (C, 1, 6)
1505), Miketone First Turquoise Blue G (
C, 1,62500), Miketon? Reester Yellow 5 R (C, 1, 26090), Sumikaron Yellow FC (C, I) manufactured by Mikata Toatsusha.

12690), Sumikaron Orange FG (C, 1,
DisperseOrange 20), Sumikaron Red 3 BR (C, I.

Disperse Red 65), Sumikaron Violet R (C, 1, Dlsperse Violet
23), Sumikaron Blue BR (C, 1,63
305) and others manufactured by Sumitomo Chemical Industries, Ltd.

Further, the toner of the present invention may further contain, if necessary, a fixing aid such as low molecular weight polyethylene, and an abrasive such as cerium oxide.

In producing the color toner of the present invention, a hot roll,
After kneading the constituent materials well using a thermal kneader such as a kneader-extruder, the material can be obtained by mechanical crushing and classification, or by dispersing materials such as dyes in a binder resin solution and then spray drying. How to get it, or
After mixing the specified materials with the monomers that constitute the binder resin,
Various methods can be applied, such as a method for producing a polymerized toner, in which a color toner is obtained by polymerizing this emulsified suspension.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto in any way.

Note that all parts in the following formulations are parts by weight. Example 1 Styrene-acrylic acid butylzotylmaleic acid (70
225:5) Copolymer 100 parts Ce111tonDi
changeB1ueFFR(C, 1, 11410)
10 parts Polypropylene 4 parts The above mixture is kneaded in a roll mill at 150°C, cooled, and coarsely ground in a speed mill. Thereafter, the powder was finely pulverized using a jet mill, and a powder of 5 to 20 μm was obtained using an air classifier, and 0.5 part of colloidal silica was added thereto to obtain a blue toner having an MI value of 10.8. The MI value of the dye-free paste material at this time was 37, and the MI value ratio was 2.9.

For 12 parts of this toner, carrier (product name, EFV2
When 88 parts of 50/400 Nippon Iron Powder) were mixed and imaged using a commercially available plain paper copying machine (product name NP-5500, manufactured by Canon), a very clear and high-density blue image was obtained. was gotten. Furthermore, when 10,000 copies were made continuously, clear images with high density were obtained, and there was no change in color tone.

Furthermore, when we superimposed the plain paper image and TP and performed vapor phase transfer at 200°C for 60 seconds, we found a very clear and high-density blue color.
I(P was obtained.

Comparative Example 1 A blue toner was obtained in the same manner as in Example 1 except that Sumikalon Blue S-3RF (manufactured by Sumitomo Chemical) was used as the colorant, and the MI value was 3.4. The ratio of MI values was 0.9. When this toner was used to produce an image in the same manner as in Example 1, a blue image was obtained which was very clear and had a high density, but had a slightly dark impression. Furthermore, I tried vapor phase transfer from the plain paper image to TP, but color HP was not obtained. Comparative Example 2 Styrene-methyl methacrylate-butyl maleate (65:30:5) co-ffi combination was used as the binder resin. A blue toner was obtained in the same manner as in Example 1 except that the MI value was 1.3. At this time, the MI value of the base material containing no dye is 1.0, and the MI value ratio is 1.0.
It was 3.

When the above toner was used to produce an image in the same manner as in Example 1, a blue image with a slightly darker impression than in Example 1 was obtained. Furthermore, when vapor phase transfer to TP was attempted as in Example 1, the OHP L was clear but insufficiently concentrated.
I couldn't get it.

Comparative Example 3 A blue toner with an MI value of 230 was obtained in the same manner as in Example 1, except that a styrene-butyl acrylate-butyl maleate (60:35:5) copolymer was used as the binder resin. The MI value of the base material that does not contain dye at this time is 16.
．． 5, and the ratio of MI values was 1.4.

When image printing was performed using the above toner in the same manner as in Example 1, problems such as offset and wrapping occurred from the beginning.

Example 2 Styrene-butyl methacrylate butyl maleate (75
:21:4) Copolymer 100 parts Kayaset R
A red toner having an MI value of 9.0 was obtained in the same manner as in Example 1 by using 5 parts of ed 130 (manufactured by Nippon Kayaku Co., Ltd.) and 4 parts of polypropylene and adding 0.6 parts of colloidal silica. At this time, the MI value of the base material containing no dye was 1'15.
3, and the ratio of MI values was 1.7.

When an image was produced using the above toner in the same manner as in Example 1, a very clear and high-density red image was obtained.

Further, when vapor phase transfer to TP was carried out, a very clear and high density color HP with no blackness was obtained.

Claims (1)

[Claims] The toner (1) containing at least a binder resin and a dye has a melt flora index of 1.5 to 20.0, and the toner (1) and the paste material (It) which does not contain the dye Ratio of melt flora index (
1/If') is 1.0 to 10.0.