JPH06118684A - Toner - Google Patents

Abstract

PURPOSE:To provide the toner which forms images having excellent light resistance by preventing the color fading, discoloration, etc., of toners and the images obtd. from the toner by the adverse influence of the sun light and illuminating light (particularly the UV rays included therein). CONSTITUTION:A pigment (yellow), charge control agent (CCA), release agent, photostabilizer, UV absorbent, and other additives are heated, melted and kneaded in a binder resin which is a raw material by a kneader, screw extruder, etc., by which a uniform mixture is formed. The mixture obtd. by cooling and solidifying the above-mentioned mixture is crushed with a crushing machine, such as cutter mill and is thereafter pulverized by a pulverizing machine, such as jet mill. The powder is classified by a dry type, airflow classifying machine and is subjected to a surface treatment at need. Finally, additives, such as flow property imparting agent and dyeing except inside preventing agent, are externally added to this powder, by which the toner is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner that can be used in copying machines, printers, plotters, facsimiles and the like.

[0002]

2. Description of the Related Art A conventional general method for producing a pulverized toner by a pulverization method will be described.

Color materials such as dyes and pigments, dye precursors, dye receivers (developing agents), charge control agents (CCAs), release agents, and other additives are added to a binder resin as a raw material by a kneader or a screw. It is heated and melted and kneaded by an extruder or the like to obtain a uniform mixture. The product obtained by cooling and solidifying is crushed by a crusher such as a cutter mill, and then finely crushed by a crusher such as a jet mill. Then, classification is performed by a dry airflow classifier, and surface treatment is performed if necessary. Finally, additives such as a fluidity-imparting agent and a dropout preventing agent are externally added to obtain a pulverized toner.

[0004]

However, an image obtained from a conventional toner is deteriorated due to deterioration such as discoloration or discoloration due to adverse effects of sunlight or illumination light (especially ultraviolet rays contained in these). I got it.

Especially for color toners, and further for full-color toners, there are cases in which color materials having excellent light resistance cannot be used because of the color balance between the toners of the respective colors. For this reason, the color toners are particularly susceptible to the adverse effects of ultraviolet rays, causing deterioration such as discoloration and discoloration, resulting in severe image deterioration.

The present invention has been made to solve the above-described problems, and toner particles due to the adverse effects of sunlight and illuminating light (in particular, ultraviolet rays contained in these) and fading of images obtained from the toner. Another object of the present invention is to provide a toner capable of preventing discoloration and forming an image having excellent light resistance.

[0007]

In order to achieve this object, the toner of the present invention contains a light stabilizer in its toner particles.

[0008]

The toner of the present invention having the above structure contains a light stabilizer in its toner particles. Therefore, the light stabilizer is also contained in the image formed by this toner. Therefore, even if the image is irradiated with sunlight or illumination light (ultraviolet rays), the light stabilizer contained in the image absorbs the ultraviolet rays in the vicinity of the image surface, and the ultraviolet rays are dyed or pigmented in the image or the dye precursor. , Because it does not reach the molecule such as dye receptor,
An image having excellent light resistance is formed by preventing fading and discoloration of an image.

[0009]

An embodiment of the present invention will be described below. In this example, a method for producing the toner of the present invention by a pulverization method will be described.

One type of light stabilizer is an ultraviolet absorber. As the ultraviolet absorber, a benzophenone derivative, preferably 2-human oxy-4-methoxy benzophenone, 2-human oxy-
4-octyloxy benzophenone etc. Also, a benzotriazole derivative, preferably 2- (2'-human oxy-5'-methylphenyl) -benzazotriazole, 2- [2'-human oxy-3 '-(3 ", 4", 5 ", 6", -Tetra-Hitorophthalimid
-Methyl) -5'-methylphenyl] -benzotriazole, 2- (5-chloro-2'-humanoxy)
-3'-tertiary-butyl-5'-methylphenyl) -benzotriazole, 2- (2'-human ethoxy-3 ', 5'-di-tert-butyl phenyl) -benzotriazole, 2- (2'-human phenoxy) -5'-tertiary-octylphenyl) -benzotriazole, 2- (2'-human ethoxy-3 ', 5'-di-tertiary-amylphenyl) -benzotriazole, 2- [2-human ethoxy-3,5-bis (α, α-Dimethylbenzyl) phenyl] -2H-Benzotriazole, 2- (3,5-Di-t-butyl-2-human benzyloxyphenyl) benzotriazole, 2-
(3,5-di-t-butyl-2-human benzyloxyphenyl) -5-chlorobenzazotriazole, 2-
(3,5-di-t-amyl-2-human oxyphenyl) benzotriazole etc. In addition, 2,4-Di-tertiary-butylphenyl-3 ', 5'-ge-tertiary-butyl-4'
-Hydroxybenzoate, and a condensate thereof with methyl-3- [3-t-butyl-5- (2H-benzotriazol-2-yl) -4-humanoxyphenyl] propionate-polyethyleneglycol) and the like.

Further, as a light stabilizer different from the ultraviolet absorber, a hindered amine derivative, preferably gas (2,2,6,
6-Tetramethyl-4-pentaphenyl) sebacate, bis (1,2,2,6,6-pentamethyl-
4-Peperyl) sebacate, 1- [2- [3- (3,5-di-t-butyl-4-human benzyloxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di-t- Butyl-4-human benzyloxyphenyl) propionyloxy] -2,2,6,6-tetramethyl phenylene, 8-benzyl
-7,7,9,9-Tetramethyl-3-octyl-1,3,8-triazaspiro [4,5] undecane-
2,4-Dione, 4-Benzoyloxy-2,2,6,6-Tetramethylphosphoric acid, Dimethyl succinate-1- (2-human oxyethyl) -4-human oxy-2,2,6,6-tetramethyl Pipeline, poly [[6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine
-2,4-diyl] [(2,2,6,6-tetramethyl-4-phenyl) imino] hexamethylene
[[2,2,6,6-Tetramethyl-4-phenyldiethyl) imino]], 2- (3,5-di-t-butyl-4-human benzyloxy) -2-n-butylmalonic acid gas (1 , 2,2,6,6-pentamethyl-4-hypermethyl) and the like. Since these light stabilizers exert a synergistic effect when used in combination with the ultraviolet absorber, they may be used in combination with the ultraviolet absorber.

Pigment (yellow), charge control agent (CCA), mold release agent, light stabilizer, UV absorber, and other additives are melt-kneaded in a binder resin as a raw material with a kneader or a screw extruder. To obtain a uniform mixture. The product obtained by cooling and solidifying is crushed by a crusher such as a cutter mill, and then finely crushed by a crusher such as a jet mill. Then, classification is performed by a dry airflow classifier, and surface treatment is performed if necessary. Finally, an additive such as a fluidity-imparting agent and a dropout preventing agent is externally added to obtain a toner.

The obtained toner and a conventional toner were filled in a printer cartridge to form an image, and the obtained image was irradiated with ultraviolet rays to observe the difference between the two. As a result, the image of the conventional toner had a lighter yellow color and was discolored and discolored, whereas the image of the toner of the present invention was not discolored and discolored.

The present invention is not limited to the above-described embodiments, and materials, configurations, functions, methods, etc. can be changed without departing from the scope of the claims.

In addition to the pulverization method, there is a polymerization method as a method for producing toner particles. The polymerization method is a method in which a resin raw material is polymerized to obtain polymer particles by an emulsion polymerization method, a suspension polymerization method, a dispersion polymerization method, or the like, and then various post-treatments are added to obtain polymerized toner particles.

When polymerized particles are produced by these polymerization methods, one or more light stabilizers may be mixed with the resin to be polymerized or may be added later during the reaction so that the light-stabilized particles are contained in the polymerized particles. By containing the agent, polymerized particles containing the light stabilizer are obtained. After that, various post-treatments are added to obtain the toner.

[0017]

As is apparent from the above description, according to the toner of the present invention, the image obtained from the toner undergoes deterioration such as fading or discoloration due to the effect of the light stabilizer contained in the toner. Do not wake up. Therefore, the image obtained from the toner is not adversely affected by ultraviolet rays, does not cause deterioration of the image, and can maintain a high quality image for a long period of time.

Claims (1)

[Claims] 1. A toner containing at least a binder resin and a coloring material such as a dye / pigment, a dye precursor and a dye receptor, wherein the toner particles contain a light stabilizer.