JP3073108B2 - Positively chargeable toner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner used for a developer for electrophotography, electrostatic printing and the like.

[0002]

[Prior art]

(First and Second Inventions) Conventionally, electrophotography has been disclosed in US Pat. No. 2,297,691, Japanese Patent Publication No. 42-2.
No. 3910 (U.S. Pat. No. 3,666,363) and Japanese Patent Publication No. 43-24748 (U.S. Pat.
A number of methods are known, for example, a photoconductive substance is used, an electric latent image is formed on a photoreceptor by various means, and then the latent image is formed. After developing using a developing powder (hereinafter referred to as toner) and transferring the toner image to a transfer material such as paper as necessary, heating, pressure,
A copy is obtained by fixing with a heat and pressure fixing roller or a solvent vapor. When a step of transferring a toner image is provided, a step for removing residual toner on the photoconductor is usually provided. Examples of a developing method for visualizing an electric latent image using toner include a magnetic brush method described in U.S. Pat. No. 2,874,063 and a U.S. Pat. No. 2,618,552. The cascade development method described and US Pat. No. 2,22
There are known a powder cloud method described in U.S. Pat. No. 1,776, and a method using a conductive magnetic toner described in U.S. Pat. No. 3,909,258.

[0003] As a toner applied to these developing methods, a fine powder obtained by dispersing a dye or a pigment in a natural or synthetic resin is conventionally used. For example, a colorant dispersed in a binder resin such as polystyrene is 1 to 30 μm.
Finely pulverized particles are used as toner. As the magnetic toner, one containing magnetic particles such as magnetite is used.In the case of a system using a so-called two-component developer, the toner is usually mixed with carrier particles such as glass beads and iron powder. Used as a mixture.

As a positive charge controlling agent used in such a toner for dry development, for example, a quaternary ammonium compound and an organic dye, particularly, a basic dye and a salt thereof are generally used. Nigrosine base and nigrosine are often positive. Used as a charge control agent. These are usually added to a thermoplastic resin, melt-dispersed by heating, finely pulverized, and adjusted to an appropriate particle size as needed, before use. However, these charge control agents are liable to cause a decrease in charge controllability due to mechanical shock, friction, changes in temperature and humidity conditions, and the like. Therefore, when a toner containing these as a charge control agent is developed using a copying machine, the number of copies increases,
The toner may deteriorate during running. In addition, since these charge control agents are extremely difficult to uniformly disperse in a thermoplastic resin, there is a problem that a difference occurs in a triboelectric charge amount between toner particles obtained by pulverization. I have.

[0005] For this reason, various methods for more uniformly dispersing have been conventionally performed. For example, when using a basic nigrosine dye, in order to improve the compatibility with the thermoplastic resin, it is used in the form of a salt with a higher fatty acid, but often the unreacted fatty acid or the dispersed component of the salt, The toner is exposed on the surface of the toner and contaminates the carrier or the toner carrier, causing a decrease in the fluidity of the toner, fog, and a decrease in image density. Alternatively, in order to improve the dispersibility of these charge control agents in a resin, a method of mechanically pulverizing and mixing a charge control agent powder and a resin powder in advance and then hot-melt kneading has been proposed. However, the actual dispersion failure cannot be avoided, and the uniformity of charge sufficient for practical use has not yet been obtained. In addition, by positively charging a monomer such as dimethylaminoethyl methacrylate in the binder resin by copolymerization or graft polymerization, by introducing an amino group to make the binder resin itself positively chargeable. Attempts have been made to provide a uniform charge to the toner.

However, the positive chargeability of the binder resin as described above is not constant, and the magnitude of frictional force received between toner particles, between toner and carrier, or between toner and a toner carrier such as a sleeve, and It varies greatly depending on the friction probability, and it may be difficult to always give a constant and stable positive charge to the toner. Therefore, the positive chargeability of the toner when the appropriate friction is not obtained is very unstable, and the copy image obtained by the toner becomes an image with much fog and scattering. On the other hand, when excessive friction occurs, the amount of positively charged electric charges on the toner surface becomes extremely large, and only an image having a large amount of roughness and a low density can be obtained.

As one method for obtaining a developer having a positive charge control property, there is a proposal in Japanese Patent Publication No. 53-22447. This is a method in which a metal oxide powder treated with aminosilane is contained as a component of the developer. However, when this method was examined in detail, for example, colloidal silica, alumina, titanium dioxide, zinc oxide, iron oxide, γ
-When ferrite and magnesium oxide are treated with various aminosilane compounds to obtain a developer according to the examples described in the specification, a developer exhibiting practically sufficient characteristics in any combination is I ca n’t get it,
It became clear that there were some problems. That is,
Many developers cannot maintain the characteristics desirable for faithfully reproducing a latent image for a long period of time. At first, those which exhibit desirable performance cannot maintain the initial characteristics after long-term continuous use, and thus cannot be used. That is, fogging occurs, toner is scattered around edges in copying a line drawing, and image density is also reduced. Another problem is that, when development and transfer are performed under a low environmental condition of high temperature and high humidity, a decrease in image density, scattering of line images, white spots and fog, etc., occur.

As another method for obtaining a positively chargeable developer, there is a method described in JP-A-59-201063. This is a method in which a fine silica powder treated with a silicon oil containing an amine in a side chain is contained as a component of the developer, instead of the fine metal powder treated with the aminosilane described above. By this method, the problem of the developer containing the fine metal powder treated with aminosilane can be compensated, and a developer having substantially sufficient characteristics can be obtained.

[0009]

However, as copiers and printers using the electrophotographic process have become more and more popular year by year, use cases in more severe environments have increased. In particular, in a low humidity environment, the toner is excessively charged, and various problems occur. In the one-component developing method using a magnetic toner or the like, for example, a phenomenon occurs in which the coat layer of the toner on the developing sleeve becomes uneven. On the other hand, in the two-component development system, phenomena such as image density bleeding and fogging occur. Accordingly, an object of the present invention is to provide a non-uniform toner coat layer on a developing sleeve in a one-component developing system and an image density mess and fog in a two-component developing system without excessive charging even in a low humidity environment. An object of the present invention is to provide a positively chargeable toner that does not occur.

[0010]

[Means for Solving the Problems]

(First and Second Inventions) The above object is achieved by the present invention described below. That is, the first invention of the present invention is characterized in that it comprises particles treated with a compound having a substituent having the following structure (1) or (2) in the molecule and silicone oil, and has a positive charge property. Toner.

Embedded image

Embedded image (R ₁ , R ₂ : hydrogen, alkyl group or aryl group)

[0011] A second invention of the present invention is characterized by containing particles treated with a compound having a substituent of the following structure (1) or (2) in a molecule and a coupling agent. Positively chargeable toner.

Embedded image

Embedded image (R ₁ , R ₂ : hydrogen, alkyl group or aryl group)

[0012]

[Action]

(1st and 2nd inventions) The present inventors have found that a toner containing a silicic acid fine powder treated with a silicone oil containing an amine in a side chain as a component of a developer can be used in a low humidity environment. As a result of intensive studies to solve the problems of the prior art, which are excessively charged and various problems occur, particles treated with a compound having a substituent having a specific structure and silicon oil or a coupling agent are used. The inventors have found that the toner is not excessively charged even in a low-humidity environment due to the action caused by the structure of the specific substituent if the toner is contained in the toner, thereby completing the present invention.

[0013]

[Preferred embodiment]

(First and Second Inventions) The present invention will be described in more detail with reference to preferred embodiments of the present invention. The first invention of the present invention is characterized in that particles treated with a compound having a substituent having the following structure (1) or (2) in the molecule and silicone oil are contained. Further, a second invention of the present invention is characterized in that particles treated with a compound having a substituent of the following structure (1) or (2) in a molecule and a coupling agent are contained. .

[0014]

Embedded image

Embedded image (R ₁ and R ₂ : hydrogen, alkyl group or aryl group)

Examples of the substituent of the above structure (1) include:
The following are mentioned.

Embedded image

Embedded image

Embedded image

Embedded image

Embedded image

Embedded image

Embedded image

Embedded image

Examples of the substituent of the above structure (2) include:
The following are mentioned.

Embedded image

As the compound for treating the particles used in the positively chargeable toner of the present invention, any compound having a substituent of the above structure (1) or (2) in the molecule can be used. However, a compound having a substituent of the structure (1) or (2) on the side chain of the polymer (or oligomer) or a compound having a substituent of the structure (1) or (2) on the coupling agent molecule is used. preferable. The polymer / oligomer having a substituent of the structure (1) or (2) in the side chain is not particularly limited, but among them, a silicon-based polymer / oligomer such as silicon varnish or silicon oil is preferable. As the silicon-based polymer / oligomer having a substituent of the structure (1) or (2) in the side chain, one having a structure represented by the formula (3) can be generally used.

[0018]

Embedded image (Where R ₁ and R ₃ represent hydrogen, an alkyl group, an aryl group or an alkoxy group, R ₂ represents an alkylene group or a phenylene group, R ₄ and R ₅ represent hydrogen,
Represents an alkyl group or an aryl group. Also, R ₂ need not be present. However, the above alkyl group, aryl group, alkylene group and phenylene group may contain an amine,
Further, it may have a substituent such as halogen as long as the chargeability is not impaired. R ₆ is a substituent of the structure (1) or the structure (2); m is a number of 1 or more;
Is a positive number including 0. As the derivatives, any known derivatives such as a vinyl group, a mercapto group, a methacryl group, a glycid group and a ureide group can be derived unless they impair the charge controllability of the above compounds. it can.

As the coupling agent having a substituent of the structure (1) or (2), a silane coupling agent or a titanium coupling agent is preferable. As the silane coupling agent having a substituent of the structure (1) or (2) or the titanium coupling agent, generally,
They have structures represented by the following formulas (4) and (5), respectively. _{R m Si-Y n ··· (} 4) R m Ti-Y n ··· (5) wherein, R represents an alkoxy group or a halogen atom,
Y is a group having a substituent of the structure (1) or (2), m and n are integers of 1 to 3, and m + n = 4.

(First Invention) The silicon oil used together with a compound having a substituent of the structure (1) or the structure (2), which is a feature of the first invention of the present invention, is a conventionally known silicone oil. Any of them can be used, and among them, those having an amino group in the side chain are preferable. As the silicone oil having an amino group in the side chain, generally, (6)
Those having a structure represented by the formula can be used.

[0021]

Embedded image (Where R ₁ and R ₃ represent hydrogen, an alkyl group, an aryl group or an alkoxy group, R ₂ represents an alkylene group or a phenylene group, R ₄ and R ₅ represent hydrogen,
Represents an alkyl group or an aryl group. Also, R ₂ need not be present. However, the above alkyl group, aryl group, alkylene group and phenylene group may contain an amine,
Further, it may have a substituent such as halogen as long as the chargeability is not impaired. _R'6 is a substituent having an amino group, and, m is a number of 1 or more, l (el) is a positive number including 0. As the derivatives, any known derivatives such as a vinyl group, a mercapto group, a methacryl group, a glycid group and a ureide group can be derived unless they impair the charge controllability of the above compounds. it can.

The silicon oil used in the present invention preferably has a nitrogen atom equivalent of 10,000 or less,
00 to 2000 is preferred. Here, the nitrogen atom equivalent is a value obtained by dividing the molecular weight by the number of nitrogen atoms per molecule by the equivalent per nitrogen atom (g / eqio). These may be used alone or in a mixture of two or more.

The amino group may be any of primary, secondary, tertiary and quaternary amines. For example, those shown below can be mentioned.

[0024] _{-NH 2 -NH-CH 3, -NH} -C 2 H 5, -NH-C 3 H 7 -N (CH 3) 2, -N (C 2 H 5) 2, -NH-C 2 _{H 4 -NH 2 -N (C 3} H 6) 2, -NH-C 2 H 4 -N (CH 3) 2 -N (C 4 H 9) 2 -N (CH 3) 3 + Cl -, - N (CH ₃ ) ₃ ⁺ .HCO ₃ ⁻ -N (C ₂ H ₅ ) ₃ ⁺ Cl ⁻ , —N (C ₂ H ₅ ) ₃ ⁺ .HCO ₃ ⁻ −N (C ₃ H ₇ ) ₃ ⁺ Cl ⁻ _{-N (C 4 H 9) 3} + Cl -

Embedded image

(Second Invention) As a coupling agent used together with a compound having a substituent of the structure (1) or (2), which is a feature of the second invention of the present invention, a conventionally known coupling agent is used. Can be used, but
Among them, a silane coupling agent and a titanium coupling agent are preferable. Among them, those having an amino group are preferred. The silane coupling agent having an amino group and the titanium coupling agent generally have structures represented by the following formulas (7) and (8), respectively. R _m Si—Z _n (7) R _m Ti—Z _n (8) where R is an alkoxy group or a halogen atom,
Is a group having an amino group. m and n are integers of 1 to 3, and m + n = 4.

The amino group may be any of primary amine, secondary amine, tertiary amine and quaternary amine. For example, those shown below can be mentioned.

[0027] _{-NH 2 -NH-CH 3, -NH} -C 2 H 5, -NH-C 3 H 7 -N (CH 3) 2, -N (C 2 H 5) 2, -NH-C 2 _{H 4 -NH 2 -N (C 3} H 6) 2, -NH-C 2 H 4 -N (CH 3) 2 -N (C 4 H 9) 2 -N (CH 3) 3 + Cl -, - N (CH ₃ ) ₃ ⁺ HCO
^{_{3 - -N (C 2 H 5}} ) 3 + Cl -, -N (C 2 H 5) 3 + · HC
^{_{O 3 - -N (C 3 H}} 7) 3 + Cl - -N (C 4 H 9) 3 + Cl -

Embedded image

(First and Second Inventions) The above-mentioned compound having a substituent of the structure (1) or (2) and particles treated with silicone oil or a coupling agent include the following inorganic fine particles and resin. And the like.
Na, Mg, Al, Si, K, C
a, Sc, Ti, V, Cr, Mn, Fe, Co, Ni,
Cu, Zn, Ga, Ge, Sr, Y, Zr, Nb, M
o, Tc, Ru, Rh, Pd, Ag, Cd, In, S
Examples include metals such as n, Ba, Ce and Pb, particles of oxides, sulfides, double oxides and salts of these metals, and carbon black. Among these,
Oxides or double oxides of Al, Si and Ti are preferred.

As the organic fine particles, styrene resin, acrylic resin, polyester resin, butanediene resin,
Examples thereof include fine particles of a resin such as a polyurethane resin, a polyamide resin, an epoxy resin, a silicone resin, polyethylene, polypropylene, and polyvinylidene fluoride, and fine particles of a fatty acid, a fatty acid metal salt, and a fatty acid ester. The specific surface area of these particles is 0.1 to 500.
m ² / g is preferred, and more preferably 0.5 to 450 m ²
/ G, more preferably 1 to 400 m ² / g. The treatment amount of the particles is preferably 0.1 to 70 parts by weight based on 100 parts by weight of the particles.

Assuming that the throughput of particles of the compound having a substituent of the above structure (1) or (2) is M _A, and the throughput of particles of the silicone oil or the coupling agent is M _B , M _A / M _B is 0.01 to 100, more preferably a 0.02 to 50. Further, as a treatment method, a compound having a substituent of the structure (1) or the structure (2) and a silicone oil or a coupling agent may be simultaneously treated on particles, or after treated with either, The other method may be used.

The effect of the positively chargeable toner of the present invention is particularly obtained when the developing sleeve to be coated with the toner has a plurality of spherical trace depressions formed on the surface of the sleeve. As a method of obtaining the surface state,
A blasting method using shaped particles can be used. As the fixed particles used at this time, for example, various hard spheres made of metal such as stainless steel, aluminum, steel, nickel and brass having a specific particle size, or various hard spheres such as ceramic, plastic and glass beads are used. You can do it. Further, the developing sleeve used in the present invention can be obtained by further performing blast treatment with regular particles on the surface on which random irregularities are formed by blast treatment with irregular particles of various hard spheres as described above. I can do it. Further, a blast treatment method using both irregular shaped particles and regular shaped particles at the same time is also possible. Arbitrary abrasive grains can be used as the irregular shaped particles. By using a fixed particle having a specific particle size and blasting the sleeve surface, a plurality of spherical trace depressions having substantially the same diameter R can be formed.

In the present invention, the diameter R of the plurality of spherical trace depressions formed on the sleeve surface is preferably from 20 to 250 μm, and if the diameter R is less than 20 μm, contamination by components in the magnetic toner increases, which is not preferable. . Conversely, if the diameter R exceeds 250 μm, the uniformity of the toner coat on the sleeve is undesirably reduced. As the shaped particles, the surface is substantially composed of a curve, and the ratio of diameter / minor axis is 1 to 2 (preferably 1 to 1.5, more preferably 1 to 1.5).
The spherical or spheroidal particles of 1.2) are preferred. Therefore, the shaped particles used in the blasting of the sleeve surface preferably have a diameter (or a long diameter) of 20 to 250 μm.

The pitch P and the surface roughness d of the irregularities on the surface of the sleeve subjected to the blasting treatment with the fixed particles are determined by measuring the surface of the sleeve with a minute surface roughness meter (Taylor Hobson, Kosaka Laboratory, etc.). And the surface roughness d is
10-point average roughness (RZ) according to "JIS B 0601". Of a straight line parallel to the average line of the portion extracted by the reference length L from the cross-sectional curve, a straight line passing through the third highest peak from the highest, and a straight line passing through the third valley bottom from the deepest,
The interval between two straight lines is represented by a micrometer (μm). Here, the reference length is L = 0.25 mm.

The pitch P is set at 0.
Those having a height of 1 μm or more are counted as one peak, and are obtained as follows from the number of peaks within the reference length of 0.25 mm. [250 (μm)] / [Number of peaks included in 250 (μm) (μm)] In the present invention, the pitch P of the irregularities on the surface of the sleeve subjected to the blast treatment with the fixed particles is preferably 2 μm or more, and P is preferably When the thickness is less than 2 μm, sleeve contamination due to components in the magnetic toner increases, which is not preferable. Further, the surface roughness d of the unevenness of the sleeve surface is preferably 5 μm or less, and when d exceeds 5 μm, an alternating voltage is applied between the sleeve and the latent image holding member to cause magnetic transfer from the sleeve side to the latent image surface. It is not preferable to use a method in which development is carried out by flying toner, since an electric field tends to concentrate on uneven portions to cause a disturbance in an image.

Examples of the binder resin used in the toner of the present invention include styrene such as polystyrene, poly-P-chlorostyrene, and polyvinyltoluene and a monomer of a substituent thereof; styrene-P-chlorostyrene copolymer, styrene-propylene. Copolymer, styrene-vinyltoluene copolymer, styrene-vinylnaphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer,
Styrene-octyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-acryl-aminoacrylic copolymer,
Styrene-aminoacrylic copolymer, styrene-aminomethacrylic copolymer, styrene-α-chloromethyl methacrylate copolymer, styrene-acrylonitrile copolymer, styrene-vinyl methyl ether copolymer, styrene-vinylethyl Ether copolymer, styrene-vinyl methyl ketone copolymer, styrene-butanediene copolymer, styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, styrene-maleic acid copolymer, styrene-maleic ester Styrene copolymers such as copolymers; polymethyl methacrylate;
Polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, polyester, polyurethane, polyamide, epoxy resin, polyvinyl butyral, polyacrylic acid resin, terpene resin,
Phenol resins, aliphatic or cycloaliphatic hydrocarbon resins, aromatic petroleum resins, chlorinated paraffins, paraffin waxes and the like can be used alone or in combination of two or more as needed.

In particular, if the binder resin is limited to those suitable for pressure fixing, the following resins can be used alone or in combination. For example, polyolefin (low molecular weight polyethylene, low molecular weight polypropylene, polyethylene oxide, poly-4-fluoroethylene, etc.), epoxy resin,
Polyester resin, styrene-butanediene copolymer (monomer ratio 5-30: 95-70), olefin copolymer (ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, ethylene-methacrylic acid copolymer) Union, ethylene-methacrylic acid ester copolymer, ethylene-vinyl chloride copolymer, ethylene-vinyl acetate copolymer, ionomer resin), polyvinylpyrrolidone,
Examples thereof include a methyl vinyl ether-maleic anhydride copolymer, a maleic acid-modified phenol resin, and a phenol-modified terpene resin.

When the toner of the present invention is used as a two-component developer, it is used by mixing with a carrier powder.
As the carrier that can be used in the present invention, all known carriers can be used, for example, powders having magnetism such as iron powder, ferrite powder and nickel powder, glass beads and the like, and the surfaces thereof are treated with a resin or the like. And the like. The mixing ratio of the toner and the carrier is usually 0.1 to 60:
99.9-40. The toner of the present invention can be used as a magnetic toner by further containing a magnetic material. Examples of the magnetic material contained in the magnetic toner of the present invention include iron oxides such as magnetite, maghematite, and ferrite;
Metals such as cobalt and nickel or these metals and aluminum, cobalt, copper, lead, magnesium, tin,
Examples include alloys with metals such as zinc, antimony, beryllium, bismuth, cadmium, calcium, manganese, selenium, titanium, tungsten and vanadium, and mixtures thereof. These ferromagnetic materials preferably have an average particle size of about 0.1 to 2 μm, more preferably about 0.1 to 1 μm, and are contained in the toner in an amount of 100 parts by weight of the resin component. About 20 to 200 parts by weight, particularly preferably 40 to 15 parts by weight per 100 parts by weight of the resin component.
0 parts by weight.

As long as it does not adversely affect the toner of the present invention, it can be used in combination with a conventionally known charge control agent. Examples of the charge control agent include a nigrosine dye, a quaternary ammonium salt, and a triphenylmethane compound. Among these, a triphenylmethane compound is particularly preferred. Further, for the purpose of improving the releasability at the time of fixing with a hot roll, polyalkylene waxes such as low molecular weight polyethylene and low molecular weight polypropylene, or waxes such as copolymerized waxes thereof, microcrystalline wax, carnauba wax and sasol wax are used. The substances can be added alone or in combination in the order of 0.5 to 5% by weight.

Further, the toner of the present invention can obtain better results when additives are mixed as required. As additives, for example, lubricants such as Teflon and zinc stearate, or abrasives such as cerium oxide and silicon carbide, or, for example, fluidity-imparting agents such as aluminum oxide, anti-caking agents, or, for example, carbon black And a conductivity-imparting agent such as tin oxide, or a fixing aid such as low-molecular-weight polyethylene. In addition, reverse polarity white fine particles can be used as a developing property improver.

In order to produce the positively charged toner according to the present invention, the above-mentioned charge control agent is a vinyl-based or non-vinyl-based thermoplastic resin, a pigment or dye as a colorant, and a magnetic material if necessary. After the additives and the like are thoroughly mixed by a ball mill or other mixer, the mixture is melted, kneaded and kneaded using a hot kneader such as a heating roll, kneader, extruder, etc., and the resins are mutually dissolved. After dispersing or dissolving the content or the dye, solidifying by cooling, pulverizing and classifying, a toner having an average particle diameter of 1 to 20 μm can be obtained. Alternatively, a method in which the material is dispersed in a binder resin solution and then obtained by spray drying, or a method in which a predetermined material is mixed with a monomer to constitute the binder resin to form an emulsified suspension, followed by polymerization. For example, a method of polymerizing toner for obtaining a toner, or a method of capsule toner comprising a core and a wire can be applied.

[0041]

Next, the present invention will be described in more detail with reference to examples and comparative examples of the present invention, but this does not limit the present invention in any way. All parts in the following formulations are parts by weight.

(First Invention) <Example 1> Silicon oil (A) having a side chain of -CH ₂ CH ₂ CH = NH (nitrogen atom equivalent: 800, 25 ° C)
Of 80 cps), 5 parts by weight, and -CH on the side chain.
Silicon oil having a group of ₂ CH ₂ CH ₂ —NH ₂ (B)
(Nitrogen atom equivalent: 800, viscosity at 25 ° C: 80 cp
s) Silica (specific surface area: 130 m ²⁾ synthesized by a dry method was prepared by diluting 5 parts by weight with n-hexane 4 times.
/ G) 100 parts by weight were sprayed while stirring, and the temperature was 25
The temperature was raised to 0 ° C. for treatment.

Next, the following materials were mixed well in a blender, and kneaded with two rolls heated to 150 ° C. After allowing the kneaded material to cool naturally, coarsely pulverize it with a cutter mill, pulverize it using a fine pulverizer using a jet stream, classify it using an air classifier, and charge positively with a weight average particle size of 8.5 μm. A black small particle size fine powder having properties (hereinafter referred to as black toner) was obtained.・ Styrene-butyl acrylate copolymer (80:20) 100 parts ・ Magnetite 80 parts ・ Low molecular weight polypropylene wax 4 parts ・ Charge control agent of the following structure 2 parts

[0044]

Embedded image

The black toner 100 obtained as described above
0.6 parts by weight of the above treated silica was added to the parts by weight, and mixed with a Henschel mixer to obtain the toner of the present invention. The toner thus obtained is transferred to a copying machine NP-2.
020 (manufactured by Canon) in a low-temperature and low-humidity environment (15
℃ / 10%) and under normal temperature and low humidity environment (20 ℃ / 5
%), And an image output test of 2,000 sheets was performed. Further, an image output test was performed on 10,000 sheets in a high-temperature and high-humidity environment (32.5 ° C./85%). Table 1 shows the results. Furthermore,
After that, when left for one week in a high-temperature and high-humidity environment and then imaged, sufficient density was exhibited.

<Example 2> A toner of the present invention was obtained in the same manner as in Example 1 except that a charge control agent having the following structure was used instead of the charge control agent used in Example 1. Using this, evaluation was performed in the same manner as in Example 1. Table 1 shows the results.

[0047]

Embedded image

<Examples 3 and 4> Except that the amounts of silicon oil A and silicon oil B used in Example 1 relative to the particles were as shown in Table 1, respectively,
The toner of the present invention was obtained in the same manner as in Example 1. Using this, evaluation was performed in the same manner as in Example 1. Table 1 shows the results.
Shown in

Example 5 The procedure of Example 1 was repeated, except that the silica particles used in Example 1 were replaced by alumina particles (specific surface area: 150 m ² / g) synthesized by a dry method. An inventive toner was obtained. Example 1 using this
Was evaluated in the same manner as described above. Table 1 shows the results.

Example 6 Instead of the silica particles of Example 1, TiO ₂ particles synthesized by a dry method (specific surface area: 1
But using 00m ² / g) is to obtain the toner of the present invention in the same manner as in Example 1. Using this, evaluation was performed in the same manner as in Example 1. Table 1 shows the results.

<Example 7> Instead of the silica particles of Example 1, carbon black particles (specific surface area: 200 m ² /
Except for using g), a toner of the present invention was obtained in the same manner as in Example 1. Using this, evaluation was performed in the same manner as in Example 1. Table 1 shows the results.

Example 8 Instead of the silicone oil A used in Example 1, (CH ₃ O) ₃ Si—CH ₂ CH ₂ C =
A toner of the present invention was obtained in the same manner as in Example 1, except that 5 parts by weight of a silane coupling agent having a structure of NH (C) was used. Using this, evaluation was performed in the same manner as in Example 1. Table 1 shows the results.

<Example 9> Instead of the silicone oil A used in Example 1, a silicone oil (D) having a side chain having the following structure (nitrogen valence: 850, viscosity at 25 ° C: 90 cps) was used. A toner of the present invention was obtained in the same manner as in Example 1 except that 2 parts by weight of a nigrosine dye was used instead of the charge control agent used in the toner of Example 1. Using this, evaluation was performed in the same manner as in Example 1.
Table 1 shows the results.

[0054]

Embedded image

Example 10 The following materials were mixed well in a blender and kneaded with two rolls heated to 150 ° C.
After allowing the kneaded material to cool naturally, coarsely pulverize it with a cutter mill, pulverize it using a fine pulverizer using a jet stream, classify it further using an air classifier, and obtain a positive chargeability with a weight average particle size of 12 μm. (Hereinafter, referred to as a red toner) having a small particle diameter.・ Styrene-butyl acrylate-dimethylaminoethyl acrylate copolymer (80: 17: 3) 70 parts by weight ・ Styrene-butadiene copolymer (80:20) 30 parts by weight ・ Red azo pigment 4 parts by weight ・ Low molecular weight polypropylene 4 Parts by weight of the treated silica used in Example 1
Parts by weight and 0.5 parts by weight of polyvinylidene fluoride particles were added to 100 parts by weight of the red toner and mixed with a Henschel mixer to obtain the toner of the present invention.

50% styrene-2-hydroxyethyl methacrylate-methyl methacrylate copolymer (monomer composition weight ratio = 35: 8: 57) 50% vinylidene fluoride-tetrafluoroethylene copolymer (monomer composition weight ratio = 75:25) 50% 50 parts by weight of a ferrite carrier (average particle diameter: 65 μm) coated with the above resin and 8 parts by weight of the red toner are mixed, and a color developing machine of a copying machine NP-4835 (manufactured by Canon) is used. Applicable to normal temperature and low humidity environment (20 ℃ / 5%)
And in a high temperature and high humidity environment (32.5 ° C / 85%)
0 copies were made and evaluated. Table 2 shows the results.

Comparative Example 1 A comparative toner was obtained in the same manner as in Example 1, except that silica treated with only 10 parts by weight of silicone oil B was used instead of the treated silica used in Example 1. Using this, a similar image-drawing test was performed and evaluated in the same manner as in the examples. Table 1 shows the results.

Comparative Example 2 A comparative toner was obtained in the same manner as in Example 10 except that the treated silica used in Comparative Example 1 was added instead of the treated silica used in Example 10. Evaluation was performed in the same manner as in the example. Table 1 shows the results.

[0059]

[Table 1] Table 1

[0060]

[Table 2] Continued from Table 1

[0061]

[Table 3] Continued from Table 1

Evaluation of uniformity of toner coat ○: No problem at all. Δ: Some uneven coating occurred on the sleeve, but no abnormality was found on the image. X: Coat unevenness occurs on the sleeve, and stains occur on the white background on the image.

[0063] (second invention) <Example 11> silicon side chain is _{-CH 2 CH 2 CH = N-} H Oil (A) (nitrogen atoms equivalent: 800,25
5 parts by weight of a viscosity at 80 ° C.) and 5 parts by weight of a silane coupling agent (B ′) having the following structure are n-
A product diluted four-fold with hexane was sprayed while stirring 100 parts by weight of silica (specific surface area: 130 m ² / g) synthesized by a dry method, and the temperature was raised to 250 ° C. for treatment.

[0064]

Embedded image

Next, the following materials were mixed well in a blender, and kneaded with two rolls heated to 150 ° C. After allowing the kneaded material to cool naturally, coarsely pulverize it with a cutter mill, pulverize it using a fine pulverizer using a jet stream, classify it using an air classifier, and charge positively with a weight average particle size of 8.5 μm. A black small particle size fine powder having properties (hereinafter referred to as black toner) was obtained.・ Styrene-butyl acrylate copolymer (80:20) 100 parts ・ Magnetite 80 parts ・ Low molecular weight polypropylene wax 4 parts ・ Charge control agent of the following structure 2 parts

[0066]

Embedded image

The black toner 100 obtained as described above
0.6 parts by weight of the above treated silica was added to the parts by weight, and mixed with a Henschel mixer to obtain the toner of the present invention. The toner thus obtained is transferred to a copying machine NP-2.
020 (manufactured by Canon) in a low-temperature and low-humidity environment (15
° C / 10%) and under normal temperature and low humidity environment (20 ° C / 5%),
An image output test of 2,000 sheets was performed. Further, in a high-temperature and high-humidity environment (32.5 ° C./85%), an image output test of 2,000 sheets was performed. Table 2 shows the results.

<Example 12> A toner of the present invention was obtained in the same manner as in Example 11 except that a charge control agent having the following structure was used instead of the charge control agent of Example 11. Using this, evaluation was made in the same manner as in Example 11. Table 2 shows the results.

[0069]

Embedded image

<Embodiment 13 and Embodiment 14> Embodiment 11
The toner of the present invention was obtained in the same manner as in Example 11, except that the treatment amounts for the particles of the silicone oil A and the silane coupling agent B ′ used in Example 1 were respectively as shown in Table 1. Using this, evaluation was performed in the same manner as in Example 1. Table 2 shows the results.

Example 15 Example 11 was repeated except that the silica particles used in Example 1 were replaced by alumina particles (specific surface area: 150 m ² / g) synthesized by a dry method.
In the same manner as in the above, a toner of the present invention was obtained. Using this, evaluation was made in the same manner as in Example 11. Table 2 shows the results.

Example 16 The present invention was carried out in the same manner as in Example 11 except that TiO ₂ particles (specific surface area: 100 m ² / g) synthesized by a dry method were used instead of the silica particles of Example 11. Was obtained. Example 1 using this
The evaluation was performed in the same manner as in Example 1. Table 2 shows the results.

<Example 17> Instead of the silica particles of Example 11, carbon black particles (specific surface area: 200 m ²⁾
/ G), to obtain the toner of the present invention in the same manner as in Example 11. Using this, evaluation was made in the same manner as in Example 11. Table 2 shows the results.

Example 18 Instead of the silicon oil used for the particles A of Example 11, (CH ₃ O) ₃ Si—CH _{2 was used.}
A toner of the present invention was obtained in the same manner as in Example 11, except that 5 parts by weight of a silane coupling agent having a structure of CH ₂ C ＝ NH (D) was used. Using this, evaluation was made in the same manner as in Example 11. Table 2 shows the results.

<Example 19> Instead of the silicone oil (A) used in Example 11, the silicone oil (E) having a side chain having the following structure (nitrogen valence: 850, 25 ° C)
The viscosity of the toner of Example 11 was 90 cps), and the toner of the present invention was obtained in the same manner as in Example 11 except that 2 parts by weight of a nigrosine dye was used instead of the charge control agent used in the toner of Example 11. Using this, evaluation was made in the same manner as in Example 11. Table 2 shows the results.

[0076]

Embedded image

Example 20 The following materials were mixed well in a blender and kneaded with two rolls heated to 150 ° C.
After allowing the kneaded material to cool naturally, coarsely pulverize it with a cutter mill, pulverize it using a fine pulverizer using a jet stream, classify it further using an air classifier, and obtain a positive chargeability with a weight average particle size of 12 μm. (Hereinafter, referred to as a red toner) having a small particle diameter.・ Styrene-butyl acrylate-dimethylaminoethyl acrylate copolymer (80: 17: 3) 70 parts by weight ・ Styrene-butadiene copolymer (80:20) 30 parts by weight ・ Red azo pigment 4 parts by weight ・ Low molecular weight polypropylene 4 Part by weight Treated silica used in Example 11 for this red toner
0 parts by weight and 0.5 parts by weight of polyvinylidene fluoride particles were added to 100 parts by weight of the red toner and mixed with a Henschel mixer to obtain the toner of the present invention.

Styrene-2-hydroxyethyl methacrylate-methyl methacrylate copolymer (monomer composition weight ratio = 35: 8: 57) 50% ・ vinylidene fluoride-tetrafluoroethylene copolymer (monomer composition weight ratio = 75:25) 50% 100 parts by weight of a ferrite carrier (average particle diameter: 65 μm) coated with the above resin and 8 parts by weight of the red toner are mixed, and a color developing device of a copying machine NP-4835 (manufactured by Canon) is used. And low temperature environment (20 ℃ / 5
%) In a high-temperature and high-humidity environment (32.5 ° C / 85%).
00 sheets were copied and evaluated. Table 2 shows the results.

Comparative Example 3 Instead of the treated silica used in Example 11, silicon oil (C) having a side chain of —CH ₂ CH ₂ CH ₂ NH ₂ (nitrogen equivalent: 800, 25 ° C.)
The toner was obtained and evaluated in the same manner as in Example 11, except that the treated silica was used only at 10 parts by weight (viscosity: 80 cps). Table 2 shows the results.

Comparative Example 4 Example 2 was repeated except that the treated silica of Comparative Example 1 was added instead of the treated silica of Example 20.
A toner for comparison was obtained in the same manner as in Example No. 0, and evaluated in the same manner as in Example. Table 2 shows the results.

[0081]

[Table 4] Table 2

[0082]

[Table 5] Continued from Table 2

[0083]

[Table 6] Continued from Table 2

Evaluation of uniformity of toner coat ○: No problem at all. Δ: Some uneven coating occurred on the sleeve, but no abnormality was found on the image. X: Coat unevenness occurs on the sleeve, and stains occur on the white background on the image.

[0086]

As described above, the positively chargeable toner of the present invention is
Despite containing particles treated with silicone oil containing amine in the side chain as a component of the developer, the toner is not excessively charged in a low humidity environment. Therefore, in a one-component developing method using a magnetic toner or the like, the toner coat layer on the developing sleeve does not become uneven. Further, the positively chargeable toner of the present invention does not cause phenomena such as image density and fog in the two-component developing system.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03G 9/08

Claims (2)

(57) [Claims] 1. A positively chargeable toner comprising particles treated with a compound having a substituent having the following structure (1) or (2) in a molecule and silicone oil. Embedded image Embedded image (R ₁ , R ₂ : hydrogen, alkyl group or aryl group) 2. A positively chargeable toner comprising particles treated with a compound having a substituent having the following structure (1) or (2) in a molecule and a coupling agent. Embedded image Embedded image (R ₁ , R ₂ : hydrogen, alkyl group or aryl group)