JPS62189476A - Toner composition for electrophotography - Google Patents

Abstract

PURPOSE:To obtain the titled composition capable of preventing the transfer of a plasticizer contg. in a vinyl chloride film, and having improved fixing, offset and antiblocking properties by consisting essentially of a vinyl copolymer contg. 3-15wt% acrylamide or methacrylamide to the titled composition. CONSTITUTION:The titled composition comprises mainly the vinyl copolymer contg. 3-15wt% (meth)acrylamide as the constituting unit. If the amount of (meth)acrylamide contg. in the vinyl copolymer is <3wt%, the effect of preventing the transfer of the plasticizer is reduced. If the prescribed amount is >15wt%, the amount of an electrostatic charge due to an absorption thereof falls. The prescribed effect is remarkably improved by copolymerizing an acid component. The acid component is preferably incorporated so as to be 0.1-30 the acid value of the copolymer. Thus, the titled composition capable of preventing the transfer of the plasticizer contg.in the vinyl chloride film and having the improved characteristics such as fixing, offset, antiblocking, development, transfer, cleaning and electrostatic stability properties is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic toner composition used for developing electrostatic images in electrophotography, electrostatic recording, electrostatic printing, and the like.

[Conventional technology]

Electrophotography generally uses a photoconductive substance to form an electrical latent image on a photoreceptor by various means, then develops the latent image with toner and prints it on a fixed sheet such as paper. This is a method in which a toner image is transferred to a substrate and then fixed by heating, pressure, solvent vapor, etc. to obtain an object. Toners used in electrophotography have conventionally used resins such as styrene and acrylic monomer copolymers as binders.

[Problem that the invention seeks to solve]

Objects obtained using electrophotography or documents created using electrophotography printers should be filed and stored.
Often saved. Vinyl chloride film is often used as a file material. When objects, documents, etc. made using conventional RPC copier toner are filed on vinyl chloride film, the file material and chloride film are often used. The vinyl film was difficult to peel off (damage to the object to be filed and contamination of the vinyl chloride film occurred. This development was caused by a portion of the plasticizer in the vinyl chloride film that came into contact with the toner transferring to the toner, and due to temperature changes. This problem becomes more noticeable in high places and in summer.Because of this problem, it is desired to develop a toner that retains the characteristics of RPC copier toner and also has the above-mentioned resistance to vinyl chloride film plasticizer migration.

The present invention aims to improve the drawbacks of such conventional toners and provide a toner with excellent performance.

That is, the object of the present invention is to provide a toner composition in which migration of a plasticizer in a vinyl chloride film is prevented.

Another object of the present invention is to provide a toner composition with good fixing properties, offset properties, and blocking properties.

[Means for solving problems]

The present inventors have completed the present invention by discovering that plasticizer migration in vinyl chloride can be prevented by using a vinyl copolymer formed by copolymerizing amide in an appropriate proportion as a toner binder.

That is, the present invention is a toner composition characterized in that the main component is a vinyl copolymer containing 3 to 15% by weight of (meth)acrylamide as a structural unit.

The vinyl copolymer of the present invention is a polymer obtained by copolymerizing 3 to 15% by weight of (meth)acrylamide with another vinyl monomer. Usually, suspension polymerization method, ethyl acrylate, propyl acrylate, butyl acrylate, octyl acrylate, cyclohexyl acrylate, lauryl nacrylate, stearyl acrylate, benzyl acrylate, furfuryl acrylate, tetrahydrofuryl acrylate Furyl, acrylic esters such as hydroxyethyl acrylate, hydroxybutyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, octyl methacrylate, lauryl methacrylate, methacrylate Methacrylic acid esters such as stearyl acid, cyclohexyl methacrylate, benzyl methacrylate, furfuryl methacrylate, tetrahydrofurfuryl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, Aromatic vinyl monomers such as vinyltoluene, α-methylstyrene, chlorstyrene, and styrene, unsaturated dibasic acid dialkyl esters such as dibutyl maleate, dioctyl maleate, dibutyl fumarate, and dioctyl fumarate, vinyl acetate, Vinyl esters such as vinyl propionate,
Nitrogen-containing vinyl monomers such as acrylonitrile and methacrylonitrile, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and cinnamic acid, maleic acid, maleic anhydride,
Unsaturated dicarboxylic acids such as fumaric acid and itaconic acid, unsaturated dicarboxylic acids such as monomethyl maleate, monoethyl maleate, monobutyl maleate, monooctyl maleate, monomethyl fumarate, monoethyl fumarate, monobutyl fumarate, and monooctyl fumarate. These include acid monoesters, styrene sulfonic acid, acrylamide propane sulfonic acid, etc.

1 of (meth)acrylamide in vinyl copolymer is 3-
15% by weight, preferably in the range of 5 to 13% by weight.

If it is less than 3% by weight, the effect of preventing plasticizer migration is small (,15
If the weight percentage is exceeded, the amount of charge decreases due to absorption.

To prevent plasticizer migration from vinyl chloride film to toner (
Although meth)acrylamide is effective, to further increase the effect it is effective to copolymerize with an acid component. (Meth)acrylamide has high hygroscopicity, so if it is used in large quantities, the amount of charge will decrease, but by copolymerizing the acid component, the effect of preventing plasticizer migration is dramatically improved, and as a result, (meth)acrylamide It requires less amount of
Also, the amount of charge is stabilized. Examples of the acid component include monomers having a carboxyl group, a sulfonic acid group, a phosphoric acid group, etc., and the aforementioned unsaturated carboxylic acids and unsaturated dicarboxylic acids are particularly preferred.

The amount of the acid component is preferably such that the acid value of the copolymer is from 0.i to 30, particularly preferably from 0.5 to 20. If the acid value is less than 0.1, the synergistic effect of preventing plasticizer migration will be small (,
When it exceeds 30, the hygroscopicity increases and the charge amount decreases.

Furthermore, toner properties such as anti-blocking properties, developability, transferability, cleaning properties, pulverization properties, charging stability, etc. using the toner composition of the present invention are not inferior to those of conventional toner compositions.

In producing the toner, a powder obtained by pulverizing the vinyl copolymer by a conventional method, various coloring agents represented by carbon blank, and if necessary, for example, %z4'g!q to adjust triboelectric charging properties are used. , charge control agents such as metal-containing azo dyes, auxiliary agents such as polyolefin inwanx, stearic acid derivatives, silicone oil, etc. that help prevent off-cent, or magnetic iron oxide, reduced iron powder, etc. in the case of making a magnetic toner. After cross-mixing with a kneader or the like, the toner is produced by pulverizing and classifying.It is also possible to mix other resin components within a range that does not impede the effects of the present invention.

The amount of vinyl copolymer in the toner is usually 35 to 95% by weight.

A toner obtained by mixing the binder composition of the present invention and the above-mentioned various materials, melting, mixing, pulverizing, and classifying the mixture exhibits an excellent effect in preventing plasticizer migration into vinyl chloride. Further, it is possible to obtain a product having good fixing properties, offset properties, anti-blocking properties, developability, transfer properties, cleaning properties, pulverization properties, and charging stability.

〔Example〕

EXAMPLES The present invention will be specifically explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 The following experiment was conducted to see the effect of the amount of methacrylamide.

Add 500 parts of Kijirole to a flask No. 21 and heat at 90°C.
After raising the temperature to , a mixed solution of 10 parts by weight of methacrylamide, 15 parts by weight of methacrylic acid, 700 parts by weight of styrene, 275 parts by weight of n-butyl methacrylate, and 3.5 parts by weight of azobisisobutylnitrile as a catalyst was added dropwise over 3 hours. After that,
Polymerization was carried out at 90°C for 3 hours. The resulting polymer solution was solvent removed to obtain a vinyl polymer having a weight average molecular weight of 3.0×10' and an acid value of 10. Using this vinyl polymer as a binder, a toner was experimentally produced in the following manner. Vinyl polymer 1
00 parts by weight, 7 parts by weight of carbon black, 3 parts by weight of polyethylene wax, and 15 parts by weight of SUVIRON BLACK TRHO were mixed, melted and mixed in a twin-screw extruder, pulverized in a jet pulverizer, and classified to determine the particle size. A toner having a diameter of 5 to 15 μm was produced to obtain Toner A.

Table 1 shows the evaluation results of this toner.

The evaluation method was as follows. For PVC plasticity, place a completely fixed object on a flat plate, place a vinyl chloride film on top of it, and then place a flat plate on top. 20 at 50℃
The weight in grams/crl was recorded for 24 hours, and the surfaces of the object and vinyl chloride were observed at room temperature. The charge amount was measured using a blow-off charge amount measuring device after mixing between practical charges at a humidity of 55% and a temperature of 22°C and a humidity of 95% and a temperature of 30°C.

Toners B-G were produced in the same manner as toner A except that the monomer composition of the vinyl polymer is shown in Table 1, and the evaluation results are shown in Table 1.

Example 2 The following experiment was conducted to examine the effects of the amounts of acrylamide and methacrylic acid.

Add 500 parts by weight of Kijirole to a flask of 90.
After heating to ℃, 60 parts by weight of acrylamide, methacrylic acid O
A mixture of 91 parts by weight, 700 parts by weight of Styrene, 240 parts by weight of n-butyl methacrylate, and 3.5 parts by weight of azobisisobutylnitrile as a catalyst was dropped into a flask at 90°C over 3 hours, and then heated at 90°C. Polymerization was carried out for 3 hours. The polymerization solution was desolvented to obtain a vinyl polymer having a weight average molecular weight of 2.9×10' and an acid value of 0.07. This vinyl polymer was made into a toner under the same conditions as Toner A to obtain Toner H.

The evaluation was conducted under the same conditions as Toner A, and the evaluation results are shown in Table 2.
It was shown to. Toners I to N were produced in the same manner as Toner H except that the monomer composition of the vinyl polymer is shown in Table 2, and the results are shown in Table 2.

Judgment Criteria: Resistance to vinyl chloride plasticizer migration ○ No abnormality @ Some evidence, but usable × Migration: Charge characteristics after large moisture absorption ○ Almost no change ◎ Slightly decreased, but usable × Comparative example 1 with significant decrease As a comparison with the present invention, a commonly used styrene-acrylic toner will be evaluated.

Add 500 parts by weight of Kijirole to a flask of 90.
After raising the temperature to °C, 700 parts by weight of styrene, 285 parts by weight of n-butyl methacrylate, 15 parts by weight of methacrylic acid and catalyst AI
A mixed solution containing 3.5 parts by weight of BN was dropped into a flask at 90°C over 3 hours, and then polymerized at 90°C for 3 hours. The polymerization solution was desolvented to give a weight average molecular weight of 3.0×10' and an acid value of 10.2.
A vinyl polymer was obtained.

This vinyl polymer was evaluated under the same conditions as Toner A.

The evaluation results are shown in Table 3.

Table 3 [Effects of the Invention] As described above, by using the vinyl polymer toner composition of the present invention, it is possible to prevent plasticizer transfer from vinyl chloride film to the toner, and it is possible to prevent the transfer of the plasticizer from vinyl chloride film to the toner. It is clear that no abnormality will occur even if the file is filed.

Claims (1)

[Claims] 1. A toner composition for electrophotography, comprising as a main component a vinyl copolymer containing 3 to 15% by weight of acrylamide or methacrylamide.