JPS60213959A - Toner for electrostatic charge development - Google Patents

Abstract

PURPOSE:To obtain good frictional electrifiability and negative electrifiability and to enable application to color copying by incorporating a specific compd. into a binder resin. CONSTITUTION:The compd. expressed by the formula (RO)nZr(X)4-n (n is 0-3, R is a hydrocarbon group, etc. X is carboxylic residue having a perfluoroalkyl group in the molecule) is incorporated into a binder resin. Lower alkyl or 1-5C is used for such Zr compd. and the perfluoroalkyl group of >=3C is preferable for X as said group has the large power to decrease surface tension. Such Zr compd. is mixed with a binder such as, for example, styrene or the like, coliring agent, etc. and is made into a toner by melting, kneading and pulverizing. The toner made in such a way is used as a one-component developer or two-component developer together with a carrier. The toner contg. the Zr comp. has negative electrifiability, fast electrifying speed and substantial electrifying quantity, decreases change of the electrifying quantity even at the under a high temp. and high humidity and is stable and has a long life.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a developer, particularly a toner, for developing an electrostatic image in electrophotography or electrostatic recording, and more particularly to a toner with a negative band. Regarding.

Conventional technology In electrophotography or electrostatic recording, an electrostatic latent image formed on a photoconductor or electrostatic recording medium is developed by a magnetic brush development method, cascade development method, etc. to obtain a toner image, which is then transferred to a transfer paper or the like. An image is formed using the images.

Development is performed by electrostatic force between the electrostatic latent image and the toner, and the toner is charged to have a polarity opposite to that of the electrostatic latent image. In order to impart a predetermined charge to the toner, it is most common to use frictional charging between the toner and a carrier or between the toner and a charging member.

For example, when developing a positive electrostatic latent image formed on a Se susceptor, a method using a negatively charging resin such as polystyrene or polyester is used as a binder resin for the toner so that the toner can be negatively charged. Alternatively, a method of adding a charge control agent to the toner is known. The former method is effective in producing a toner that satisfies charging properties such as charging speed and amount with only the binder resin, and the latter method makes it difficult to uniformly disperse the charge control agent in the toner, resulting in variations in charging. Furthermore, many charge control agents are colored, making it difficult to obtain toners suitable for color copying.

Purpose of the Invention The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a toner that exhibits good triboelectric chargeability and stable negative chargeability, and further has a negative chargeability that is suitable for color copying. The purpose is to provide sexual toner.

Structure of the Invention The object of the present invention is to prepare a binder resin with the general formula % (%) [where n is an integer of 0 to 3, R is a hydrocarbon group or a substituted hydrocarbon group, and X is a perfluoroalkyl group in the molecule. Indicates a carboxylic acid residue having a group. ] This can be achieved using a toner containing a compound represented by the following.

As for the zirconium compound represented by the above general formula,
For example, R is methyl, ethyl, 5-propyl. - selected from lower alkyl such as propyl, n-butyl, i-butyl, n-amyl, i-amyl, t-amyl, etc., and X is monovalent or polyvalent carbon 1 containing a perfluoroalkyl group in the molecule
It is a compound in which a perfluoroalkyl group is directly bonded to a carboxyl group, and a compound in which a perfluoroalkyl group is bonded to a carboxyl group through another group, and an example of X is CF3COOH%C,F.

C0OH, IC8F7COOH, C, F, CoOH%C
,F,,C0OH.

C6F,, C0OH, C7F, 1lCOOH1IC,
F,7COOH,C,F,,C0OH.

c,op,,coon,c,,p,,cooH,Cs
5FsyCOOH,CF, QCs H4C0OH,3
,5-(CFli, 0)t C,HjCOOH,3,
4,5-(CP, 0)s C5Ht C0OH,C
o F110C8H4C0OH.

C, F,, QC, H, C0OH, C, F,, QC, salt C
Among them, those in which the alkyl moiety of the perfluoroalkyl group has 3 or more carbon atoms are preferably used because of their ability to reduce surface tension.

This zirconium compound has a strong resistance to the binder resin of the toner.
It is used in an amount of 0.05 to 10% by weight, preferably 0.5 to 5% by weight.

Various binder resins can be used for toner, including styrenes such as styrene, chlorostyrene, and vinylstyrene; monoolefins such as ethylene, propylene, butylene, and imbutylene; vinyl acetate, vinyl propionate, vinyl benzoate, and butyric acid. Vinyl esters such as vinyl; α-methylene such as methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate, etc. Esters of aliphatic monocarboxylic acids; vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, and vinyl butyl ether; homopolymers or copolymers of vinyl ketones such as vinyl methyl ketone and vinyl hexyl ketone ketone; Particularly typical binder resins include polystyrene, styrene-argyl acrylate copolymer, styrene-alkyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, and styrene-maleic anhydride copolymer. Mention may be made of polymers, polyethylene and polypropylene.

Further examples include polyester, polyurethane, epoxy resin, silicone resin, polyamide, modified rosin, paraffin, and waxes.

My father, the toner coloring agents are carbon black, nigrosine dye, aniline blue, calcoyl blue, chrome yellow, Tarte 2 Marine Blue, Dapon Oil Red, quinoline yellow, methylene blue chloride, phthalocyanine blue, malachite green oxiplate,
Representative examples include lamp black and rose bengal.

The binder resin and colorant are not limited to those exemplified above.

Furthermore, a magnetic toner containing a magnetic material can also be used.

The toner is smaller than about 30 μm, preferably between 3 and 3 μm.
Those having an average particle size of 20 μm can be used.

This toner can be obtained by various methods such as mixing toner components such as a binder resin, a zirconium compound, and a colorant if necessary, and melting, mixing, pulverizing, or forming into a solution and then spray-drying. Alternatively, the zirconium compound may be used by adhering it to the surface of a powder containing a binder resin and a colorant.

The toner of the present invention may be used as a so-called two-component developer together with a carrier, or as a so-called one-component developer without a carrier. In the case of a two-component developer, due to frictional charging with the carrier, or - Electrification is obtained by means of a member on the friction zone, such as a table blade or a roll for the component developer.

When a carrier is used in combination, the carrier is particles with an average particle size of approximately the same as the toner particle size or up to 500 μm, such as triiron tetroxide, sesquioxide, MnZn ferrite, NiZn ferrite, Ba ferrite, chromium dioxide. Examples include particles of iron, nickel, cobalt, and glass beads, and the surfaces of these particles may be coated with a coating agent such as acrylic resin or styrene resin.

It may also be a so-called dispersed carrier in which magnetic powder is dispersed in a binder resin.

The toner of the present invention can be used for developing a positive electrostatic latent image on a photoreceptor or an electrostatic recording medium, or for reversal development in the case of a negative electrostatic latent image, and can also be used as a color toner. It can be preferably used.

Effects of the Invention The toner of the present invention containing a specific zirconium compound exhibits excellent negative banding properties. In other words, the toner of the present invention has a fast charging speed and a sufficient amount of charging, and can reduce changes in charging properties even under severe stirring or under high temperature and high humidity, and has a stable lifespan. You can get long toner.

Furthermore, this zirconium compound is substantially colorless, and can be colored as desired when used as a color toner.

Example The present invention will be explained in more detail below using Examples.

Styrene-n-butyl acrylate resin (molecular weight 50,000,
Styrene and n-butyl acrylate (weight ratio: 8:2)
90 weight parts carbon black 8 electric resistance stitch parts Perfluoro silconium n-octoate tributogizod 2 weight parts - 17 parts The above formulation was silently melt-kneaded in a pressure kneader, cooled and solidified, and then pulverized in a jutsu mill. Thereafter, the toner was classified using an air classifier to obtain a toner having an average particle size of 12 μm.

Comparative Example A toner having an average particle size of 12 μm was obtained in the same manner as in the example except that the zirconium compound of the example was not used.

The toners obtained in the practical example and the comparative example were mixed with an iron oxide powder carrier whose surface was coated with a U-chill methacrylate resin having an average particle size of 100 μm (toner 3 was mixed with 100% by weight of the carrier to obtain two types of carrier). The developer was prepared.

Continuous copying tests were conducted using these two types of developers using Fuji Zero and Jisu 4600 copying machines.

As a result, when the developer using the toner of the comparative example was used to continuously copy 30,000 sheets, the fog in the white background area exceeded the allowable limit and the amount of developer charge was significantly reduced, whereas the developer using the toner of the example There was little fog and little change in the amount of developer charge.

Claims (1)

[Claims] In the binder resin, the following general formula %) [In the formula, n is an integer of 0 to 3, R is a hydrocarbon group or a substituted hydrocarbon group, and X is a perfluoroalkyl group in the molecule. ' indicates a carboxylic acid residue with . ] A toner for electrostatic charge development characterized by containing a compound represented by the following.