JP2001066821A - Nonmagnetic single component toner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a proper charge amount, to decrease an excessive toner fog on a photoreceptor and to avoid contamination on a white base of a printed material by mixing polyester-based negative electrification toner particles with inorganic fine powder having a large particle size and inorganic fine powder having a small particle size both treated with a specified treating agent to prepare the toner. SOLUTION: The parts by weight (Wa) of inorganic fine powder (a) having <80 m2/g BET specific surface area and treated with a silane coupling agent or silicone oil, and the parts by weight (Wb) of inorganic fine powder (b) having >=80 m2/g BET specific surface area and treated with a silane coupling agent or silicone oil added to 100 pts.wt. of toner particles are controlled to satisfy the formulae. In the formulae, f is the coating rate (%), Dt is the volume average particle diameter (μm) of the toner particles, da and db are average particle diameters (μm) of the inorganic fine powder (a) and inorganic fine powder (b), respectively, and ρt, ρa, ρb are true specific gravities of the toner particles, inorganic fine powder (a) and inorganic fine powder (b), respectively. The average particle diameter of the toner is preferably 4 to 20 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-magnetic one-component toner for developing an electrostatic image in electrophotography, electrostatic charge recording, electrostatic printing, and the like, and a non-magnetic one-component developing system using the same. .

[0002]

2. Description of the Related Art Conventionally, as an electrophotographic method, US Pat.
No. 221776, No. 2297691, No. 2357
As described in the specification such as 809, the photoconductive insulating layer is uniformly charged (charging step), and then the layer is exposed (exposure step) to dissipate the charge in the exposed portion. An electrostatic latent image is formed thereon, and a colored charged fine powder called toner is made to adhere to the electrostatic latent image so as to be visualized (development step). After the image is transferred onto a transfer material (transfer step), the image is permanently fixed by heating, pressure or other appropriate means (fixing step). After the transfer of the toner image, the residual toner on the photoconductor is scraped off to clean the photoconductor surface (cleaning step).

Of these, in the developing step, toner and
A two-component magnetic brush developing method using a two-component developer with a carrier used to impart a charge to the toner and transport the toner to an electrostatic latent image portion by a magnetic force has conventionally been used most conveniently. Also, for example, see US Pat.
As proposed in Japanese Patent No. 9258 and No. 4,121,931, a magnetic material containing a magnetic material in a toner without using a carrier and conveying the toner to an electrostatic latent image portion by a magnetic force of the toner. Component development methods have also been widely used.

[0004] More recently, US Patent No. 2,895,847.
And JP-B-3152012, JP-B-41-
Nos. 9475, 45-2877 and 54-3
A non-magnetic one-component developing method using only a toner not containing a magnetic powder described in Japanese Patent Application Laid-Open No. 624 or 624 is also used. This developing method is very advantageous in reducing the size and weight of the recording apparatus in that a magnet is not used for the developing roll. In particular, small personal copying machines, which have been actively developed in recent years,
This development method is increasingly used for printers, plain paper fax machines, full-color copying machines, and printers.

As a method of forming a full-color image using an electrophotographic method, various known methods can be used. For example, a toner image formed on a photoreceptor is wound around a transfer drum for each color. Intermediate transfer in which four color toner images are superimposed on an intermediate transfer body such as a transfer drum system, a belt shape, a drum shape, etc., which is transferred onto recording paper and four colors are superimposed on the recording paper, and then transferred onto recording paper in four colors. There are a tandem system that has a photoconductor and a developing unit for each of the four colors and sequentially superimposes four colors on recording paper in one pass, and a multiple transfer system that superimposes four colors on the photoconductor and then transfers it to recording paper. . Normally, as a full-color toner, four color toners including black in addition to three colors of cyan, magenta, and yellow are used, but other color toners may be added as needed.

For example, for a full-color printer using a non-magnetic one-component toner by adopting a reversal developing method, a compact, high-speed, low-energy fixing, and transparency when projecting an overhead projector (hereinafter referred to as OHP) are required. There is a demand for higher image quality. For this reason, as the size of the printer is reduced, the size of the developing device, the photoreceptor, the fixing device, and the like in the components tends to be reduced. Therefore, in the developing device, the toner is rotated at a high speed with a small-diameter developing roll, so that the charging of the toner is reduced, the rising property of the charging is deteriorated, the toner fog on the photosensitive member is increased, and the white matter on the printed matter is generated. Or the toner charge amount is low, the development amount is low, and the final print density is low, or the toner layer on the developing roll is not uniform due to poor charging, and the uniformity of the solid image is deteriorated. Will be. In the fixing section, for example, heat and pressure of the toner are applied by an upper heating roll and a lower pressure roll having a heater inside, and the fixing is performed. The nip width becomes small, and the heat and pressure are not sufficiently applied to the toner, so that the fixing becomes insufficient. Furthermore, because of insufficient fixing, the smoothness of the toner layer on the OHP sheet is impaired, and the transparency in the OHP sheet is deteriorated. Furthermore, in the case of a non-magnetic one-component toner, a stress is applied to the developing device when continuous printing is performed, causing a change in the toner surface due to embedding of an external additive, and a change in the charging characteristics and fluidity of the toner. And thus image density,
Due to the deterioration of image characteristics such as fogging and the consumption, the durability is deteriorated.

One example of adding inorganic fine powder to a non-magnetic one-component toner in order to improve these properties is disclosed in JP-A-63-163.
237067, JP-A-64-9466, JP-A-64-9466
Japanese Patent Application Laid-Open No. 4-155301 discloses an example of mixing a relatively coarse inorganic fine powder and a fine inorganic fine powder in a toner.
It was not enough yet.

[0008]

Accordingly, the first aspect of the present invention is as follows.
The purpose of the method is to use a non-magnetic one-component method, a developing device having a small developing roll and a charging blade, has a sufficient charging effect on the toner, and a sufficient amount of charge can be secured by rapidly charging up, It is an object of the present invention to provide a non-magnetic one-component toner which has less toner fogging on a photoreceptor, has no stain on a white background portion of a printed matter, and has good uniformity of a solid image.
A second object is to provide a non-magnetic one-component toner having good storage stability even when stored for a long period of time, sufficient fluidity required for the toner, and excellent transportability. A third object is to provide a non-magnetic one-component toner which has good durability in continuous printing by a printer or the like, and stabilizes image characteristics such as image density and fog and toner consumption.

[0009]

Means for Solving the Problems The present inventors have described the above-mentioned information.
As a result of careful examination in view of the
-Large particles of inorganic fine powder treated with a specific treating agent
Conventional toner has been developed using toner mixed with inorganic fine powder of small particle size.
To solve the problems of
And completed the present invention. That is, the gist of the present invention
Is at least a binder resin, a colorant, a negatively charged charge control agent
And a BET specific surface area of 80 m^Two
/ G of silane coupling agent or silicone oil
Treated inorganic fine powder (a) and BET specific surface area 80m ^Two
/ G or more of silane coupling agent or silicone oil
Non-magnetic one-component system mixed with treated inorganic fine powder (b)
In toner, inorganic parts are used for 100 parts by weight of toner particles.
Addition part by weight of fine powder (a) (W_a) And inorganic fine powder (b)
By weight (W_b) Satisfy the following relational expression:
It is a characteristic non-magnetic one-component toner.

[0010]

(Equation 2)

(Where f is the coverage (%), D_tIs the toner particle
Volume average particle diameter (μm), d_a, D _bIs inorganic fine powder
(A), the respective average particle diameters (μ) of the inorganic fine powder (b)
m), ρ_t, Ρ_a, Ρ_bIs toner particles, inorganic fine powder
(A), the true specific gravity of each of the inorganic fine powder (b) is shown.
You. )

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The toner particles used in the present invention are a fine powder containing a polyester resin, a colorant, and a negatively chargeable charge control agent, and a dispersion-containing fine powder containing other additives as necessary.
The average particle size of the toner particles is preferably 4 to 20 μm,
2 μm is more preferred. The particle size of the toner can be measured, for example, using a Coulter Counter manufactured by Coruter Co., Ltd., Multisizer, or the like. As the binder resin used in the present invention, various known styrene / acrylic resins, polyester resins, epoxy resins, and urethane resins suitable for toner can be used, and linear or non-linear polyester resins are particularly preferable.

The polyester resin comprises a polyhydric alcohol and a polybasic acid. If necessary, at least one of the polyhydric alcohol and the polybasic acid contains a trifunctional or higher polyfunctional component (crosslinking component). It is obtained by polymerizing the product. In the above, examples of the dihydric alcohol used for the synthesis of the polyester resin include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol,
3-propylene glycol, 1,4-butanediol,
Neopentyl glycol, 1,4-butenediol,
Diols such as 1,5-pentanediol and 1,6-hexanediol, bisphenol A, hydrogenated bisphenol A, polyoxyethylenated bisphenol A,
Examples thereof include bisphenol A alkylene oxide adducts such as polyoxypropylene-modified bisphenol A, and the like. Among these monomers, it is particularly preferable to use a bisphenol A alkylene oxide adduct as a main component monomer, and particularly preferably an adduct having an average number of addition of 2 to 7 alkylene oxides per molecule.

Examples of the trihydric or higher polyhydric alcohol involved in the crosslinking of polyester include sorbitol,
1,2,3,6-hexanetetrol, 1,4-sorbitan, pentaerythritol, dipentaerythritol, tripentaerythritol, sucrose, 1,2,4-butanetriol, 1,2,5-pentanetriol, glycerol , 2-methylpropanetriol, 2-methyl-1,2,4-butanetriol, trimethylolethane, trimethylolpropane, 1,3,5-trihydroxymethylbenzene, and the like.

On the other hand, polybasic acids include, for example, maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sebacic acid, azelaic acid Examples thereof include acids, malonic acids, anhydrides of these acids, lower alkyl esters, alkenylsuccinic acids or alkylsuccinic acids such as n-dodecenylsuccinic acid and n-dodecylsuccinic acid, and other divalent organic acids.

Examples of the trivalent or higher polybasic acid involved in the crosslinking of polyester include 1,2,4-benzenetricarboxylic acid, 1,2,5-benzenetricarboxylic acid,
1,2,4-cyclohexanetricarboxylic acid, 2,5
7-naphthalenetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 1,3-dicarboxyl-2-methyl-2-methylenecarboxypropane, tetra (methylenecarboxyl) methane, Examples thereof include 1,2,7,8-octanetetracarboxylic acid, anhydrides thereof, and others. These polyester resins can be synthesized by a usual method. Specifically, the reaction temperature (170 to 2)
Conditions such as 50 ° C.) and reaction pressure (5 mmHg to normal pressure) may be determined according to the reactivity of the monomer, and the reaction may be terminated when predetermined physical properties are obtained.

The softening temperature (Sp) of these polyester resins is usually 80 to 160 ° C., and among them, those having a softening temperature of 90 to 150 ° C. are more preferable. Also,
The glass transition temperature (Tg) is usually 50 to 75 ° C, and among them, those having a temperature of 55 to 70 ° C are more preferable.
In this case, when Sp is lower than the above range, an offset phenomenon at the time of fixing is likely to occur, and when Sp is higher than the above range, fixing energy increases, and glossiness and transparency tend to deteriorate with color toner, which is not preferable. . When the Tg is lower than the above range, the toner tends to aggregate and fix, and when the Tg is higher than the above range, the fixing strength at the time of thermal fixing tends to decrease, which is not preferable. Sp can be adjusted mainly by the molecular weight of the resin, and the number average molecular weight is preferably 2
000-20,000, more preferably 3000-120
00 is better. The Tg can be adjusted mainly by selecting a monomer component constituting the resin. Specifically, the Tg can be increased by using an aromatic polybasic acid as a main component as an acid component. That is, among the above-mentioned polybasic acids, phthalic acid, isophthalic acid, terephthalic acid, 1,2,4-benzenetricarboxylic acid, 1,
It is desirable to use 2,5-benzenetricarboxylic acid and the like and their anhydrides and lower alkyl esters as the main components.

The Sp of the polyester resin is JIS K72.
The measurement was performed using a flow tester described in No. 10 and K6719. Using a flow tester (CFT-500, manufactured by Shimadzu Corporation), about 1 g of the sample was heated at a rate of 3 ° C./mi.
n. In while heating, applying a load of 30kg / cm ² by a plunger of surface area 1 cm ^2, hole diameter 1 mm, height 1
The temperature corresponding to an intermediate point between the temperature at which the plunger starts to descend and the temperature at which the plunger descends is set as the softening temperature. The measurement of Tg was performed using a differential scanning calorimeter (DSC) at a heating rate of 10 ° C./min, and the temperature was determined as the temperature corresponding to the intersection where the inflection point (shoulder) was tangent.

On the other hand, if the acid value of the polyester resin is too high, it is generally difficult to obtain a stable high charge amount, and the charge stability at high temperature and high humidity tends to deteriorate. The value is 30 KOHmg / g
It is better to be less than 25KOHmg /
g. As a method for adjusting the acid value within the above range, other than a method of controlling the addition ratio of the alcohol-based and acid-based monomers used in the resin synthesis, for example, the acid monomer component is previously converted to a lower alkyl ester by a transesterification method. And a method of neutralizing residual acid groups by adding a basic component such as an amino group-containing glycol to the composition, but not limited thereto. Needless to say, it can be adopted. In addition,
The acid value and hydroxyl value of the polyester resin are determined according to JIS K00.
It is measured according to the method of No. 70. However, when the resin is difficult to dissolve in the solvent, a good solvent such as dioxane may be used.

Among these polyester resins, resins having different components may be used alone or in combination of two or more of known polyester resins. Resins having the same viscoelasticity and thermal properties such as different molecular weight distributions may be used. You may use individually or in combination of 2 or more types. Known resins such as styrene resins, styrene-acrylic copolymer resins, epoxy resins, and urethane resins other than polyester resins may be used in combination.
It is preferably at least 0% by weight.

The colorant used in the present invention includes carbon black; I. Pigment Yellow 1, 3, 74, 97, 98, etc .; acetoacetic arylamide monoazo yellow pigments; C.I. I. Pigment Yellow 12, 13, 14, and 17 acetoacetic acid arylamide-based disazo yellow pigments; C.I. I. Condensed monoazo yellow pigments such as CI Pigment Yellow 93 and 155;
C. I. Pigment Yellow 180, 150, 1
Other yellow pigments such as 85; I. Solvent Yellow 19, 77, 79, C.I. I. Yellow dyes such as Disperse Yellow 164;

C. I. Pigment Red 48, 4
9: 1, 53: 1, 57, 57: 1, 81, 122, 5, 146, 184, 238;
I. Red or red pigments such as CI Pigment Violet 19; I. Red dyes such as Solvent Red 49, 52, 58 and 8; C.I. I. Pigment Blue 15: 3, 15: 4, etc., blue colourants of copper phthalocyanine and derivatives thereof; I. Green pigments such as CI Pigment Green 7 and 36 (phthalocyanine green) can be used, and they may be used alone or in combination of two or more.

The amount of the colorant is preferably about 1 to 15 parts by weight, more preferably 2 to 10 parts by weight, based on 100 parts by weight of the binder resin.
As the full-color toner, four colors of black toner are used in addition to the three primary color toners of cyan, magenta and yellow. As a colorant for cyan toner,
C. I. Pigment Blue 15: 3 and 15: 4 are preferred. As a colorant for magenta toner,
C. I. Pigment Red 57: 1, 122, 1
46, 184, 238, and C.I. I. Pigment
Red or red pigments of violet 19 are preferred.
Colorants for yellow toner include C.I. I. Pigment Yellow 13, 17, 17, 74, 93, 150,
155, 180 and 185 yellow pigments are preferred.

As the colorant for the black toner, carbon black having an ultraviolet absorbance of 0.05 or less described in JP-A-6-175403 or the like is preferable because uniform and good chargeability can be obtained. In the case of a negatively charged toner, an acidic carbon black is preferable, and a pH of 7 or less, more preferably 6 or less is preferable because the negatively charged charge amount becomes better.

The negatively chargeable charge controlling agent used in the present invention is selected from the group consisting of metal-containing azo compounds, metal-containing salicylic acid compounds, metal-containing alkyl salicylic acid compounds, metal-containing benzylic compounds, and phenolamide compounds. Is good. In the case where the colorant is a black toner having at least carbon black, the colorant is preferably selected from the above five groups, and the colorant is selected from the group consisting of cyan dyes, magenta dyes, and yellow dyes. , Magenta and yellow color toners, the negatively chargeable charge control agent is preferably selected from the group consisting of metal-containing salicylic acid compounds, metal-containing alkyl salicylic acid compounds, metal-containing benzylic acid compounds, and phenolamide compounds.

As the metal-containing azo compound, Patent No. 2
C. 845331 and the like. I. Compounds classified as Solvent Violet 21, for example, commercially available products such as Bontron S-34 and S
-54, T-95 manufactured by Hodogaya Chemical Industry Co., Ltd., and compounds represented by the general formula (1) described in JP-B-63-1994 and JP-B-2-16916, for example,
As a commercially available product, SPILON BLACK TR manufactured by Hodogaya Chemical Industry Co., Ltd.
And the compound represented by the general formula (1) described in JP-B-4-75263, for example, T-77 manufactured by Hodogaya Chemical Industry Co., Ltd. as a commercial product.

Examples of the metal-containing salicylic acid compound and the metal-containing salicylic acid compound include JP-B-55-42752.
And metal complex salts or metal complexes of salicylic acid or alkyl salicylic acid described in JP-B-63-163374 and the like. These metal components include chromium, zinc,
Aluminum is preferable, for example, as a commercial product, Bontron E-81 (chromium-containing) manufactured by Orient Chemical Industries,
E-84 (zinc-containing), E-88 (aluminum-containing), and CHUO-CCA100 (chromium-containing) manufactured by Chuo Gosei Kagaku Co., Ltd. Examples of the metal-containing benzyl acid compound include compounds described in JP-B-7-13765. For example, LR-147 manufactured by Nippon Carlit Co., Ltd.
LR-297 and the like.

Examples of the phenolamide-based compound include compounds represented by the general formula (I) described in JP-A-11-102883.
Or a compound represented by the formula (II), preferably a compound represented by the general formula (II), and more preferably the compound No. 1 described in the same specification. 8 is good. The addition amount of the negatively chargeable charge control agent is 0.05 to 1 with respect to 100 parts by weight of the binder resin.
The amount is preferably 0 parts by weight, more preferably 0.1 to 8 parts by weight. Examples of the charge control agent used in the present invention include, in addition to the charge control agents described above, those that impart negative chargeability, include navy blue, ultramarine, naphthoic acid metal complex, long-chain alkyl carboxylate, and long-chain alkyl. Surfactants such as sulfonates that impart a positive charge include nigrosine dyes and derivatives thereof, triphenylmethane derivatives, quaternary ammonium salts, quaternary phosphonium salts, quaternary pyridinium salts, and guanidine salts. And derivatives such as amidine salts, etc., and may be used in small amounts. These charge control agents may be used alone or in combination of two or more.

In order to improve the dispersibility and compatibility of the colorant and the charge controlling agent in the toner, a preliminary dispersion treatment, that is, a so-called master batch treatment, may be performed in advance by kneading with a resin or the like. The particle size of the masterbatch product is preferably the same as the particle size of the binder resin. If the particle size is too large, uneven distribution of the colorant in the toner during continuous production tends to occur. In general, the masterbatch particle size may be a 3 mm mesh sieve, preferably a 2 mm or less mesh sieve. Be mixed with the toner particles in the present invention, at least a BET specific surface area of 80 m ² / g less than the silicone oil-treated inorganic fine powder (a) and BET specific surface area of 80 m ² / g or more silane coupling agent or silicone oil treatment Used together with the inorganic fine powder (b). It is preferable that these inorganic fine powders are externally added to the toner.

The relatively coarse inorganic powder (a) improves the anti-blocking property of the toner, and also forms toner particles in the developing tank and between the toner particles and the developing tank constituent members (wall, developing roll, layer thickness regulating member, etc.). ), Suppression of fine pulverization of toner by mechanical impact relaxation, suppression of embedding of external additives, prevention of filming on photoreceptor, suppression of adhesion phenomenon to toner layer thickness regulating member, etc. It is presumed that the toner has excellent storage stability due to these effects, and the durability performance is improved even when used in continuous printing, such as image deterioration, and in-machine contamination due to toner scattering and leakage. When the BET specific surface area is 80 m ² / g or more, the role of the inorganic fine powder (a) as a partition wall between the toner and the developing tank member is hardly exhibited, the blocking resistance is deteriorated, and the continuous printing is not performed. The durability performance deteriorates. The use of silicone oil as a surface treatment agent for the inorganic fine powder (a) is preferable because it imparts a hydrophobizing function to improve environmental dependency and does not easily inhibit the chargeability of the toner. In the case of the inorganic fine powder (a) treated with silicon oil, the charge rise of the negatively charged toner is improved, and the fog on the photoreceptor and the fog on the plain paper white background are improved. Surface treatment agents other than silicone oil are not preferred because they tend to impair the charging characteristics of the toner.

It is presumed that the relatively fine inorganic fine powder (b) has the effects of improving the fluidity of the toner and the transportability of the toner in the developing tank. Is excellent, the toner layer in the developing section is uniform,
A high quality printed matter such as a dense, uniform and good image portion can be obtained. When the BET specific surface area is less than 80 m ² / g, the effect of improving the toner fluidity of the inorganic fine powder (b) is weakened, and the toner replenishment is deteriorated, so that a high quality printed matter cannot be obtained. As a surface treating agent for the inorganic fine powder (b), a hydrophobic function using a silane coupling agent or silicone oil is imparted to improve the environmental dependence and to be excellent in the fluidity improving function of the inorganic fine powder. . A surface treatment agent other than the silane coupling agent or the silicone oil is not preferable because the fluidity improving function is inferior.

The core of the inorganic fine powder (a) and the inorganic fine powder (b) is selected from well-known wet or dry silica, titania, alumina, zinc oxide, magnesium oxide, magnetite, ferrite and the like. Although it can be used, silica, titania and alumina are preferred. The cores of the inorganic fine powder (a) and the inorganic fine powder (b) may be the same or different. For the surface treatment of the inorganic fine powder (a) or the inorganic fine powder (b) with silicon oil, a conventionally known method is used. For example, dimethyl silicon oil or methylphenyl silicon oil which is a general straight silicon oil is used as the silicon oil. , Methyl hydrogen silicone oil, and modified silicone oils such as methacrylic acid modified silicone oil, epoxy modified silicone oil, fluorine modified silicone oil, polyether modified silicone oil, amino modified silicone oil, etc. Used in mixtures. Preferably, the silicone oil is a straight silicone oil, of which dimethyl silicone oil is preferred.

The surface treatment of the inorganic fine powder (b) with a silane coupling agent may be performed by a conventionally known method. For example, the silane coupling agent may include an organoalkoxylan (methoxytrimethylsilane, dimethoxyalkoxylan,
Trimethoxymethylsilane, ethoxytrimethylsilane, etc.), organochlorosilane (trichloromethylsilane, dichlorodimethylsilane, chlorotrimethylsilane, trichloroethylsilane, dichlorodiethylsilane, chlorotriethylsilane, trichlorophenylsilane, etc.), organosilazane (Triethylsilazane, tripropylsilazane, triphenylsilazane, hexamethyldisilazane, hexaethyldisilazane, hexaphenyldisilazane, etc.), organodisilazane, organosilane, and the like. These are one kind or a mixture of two or more kinds. Used. Preferred as the silane coupling agent are organochlorosilane and organosilazane.
Alternatively, the surface treatment of the silicon oil may be performed after the treatment with the silane coupling agent, or the surface treatment of the silicon oil may be used in combination with the silane coupling agent.

The BET specific surface area of the inorganic fine powder is commercially available.
Using a BET specific surface area measurement device by nitrogen adsorption
Can be measured, for example, by Shimadzu Corporation
Flow type specific surface area automatic measurement device (Flow soap 2300
Shape). The average particle size of the inorganic fine powder is
Magnification (for example, 50,000)
The particle size may be measured from the image taken in step (2).
Addition amount (W) of the relatively coarse inorganic fine powder (a) of the present invention_a)
And the amount of the inorganic fine powder (b) relatively fine (W_b)
The coverage f when the toner particles are 100 parts by weight is 20%.
It is necessary to be above, but 20 to 300% is preferable.
And more preferably 30 to 200%. This range
If the amount is less, it is preferable because the original effect of the inorganic fine powder is not exhibited.
No, and too much photoconductor filming easily occurs
Fog on the photoreceptor and fog on plain paper
For example, image defects easily occur, which is not preferable. Change
And the amount of inorganic fine powder (a) added (W_a) And inorganic fine powder
(B) addition amount (W_b) Is W_aIs W_bMore than
(Ie W_a> W_b) Is necessary for achieving the effects of the present invention.
But especially W_aIs W_b0.3 parts by weight more (ie,
W _a-W_b≧ 0.3) is more preferable. inorganic
Addition amount of fine powder (a) and inorganic fine powder (b)
Calculate the coverage ratio f of each of
Preferably, the rate is f ≦ 200, preferably f ≦ 100.
If it is more than this, that of inorganic fine powders (a) and (b)
It is difficult to exert each effect, causing image defects etc.
It tends to be easy. Inorganic fine powder of toner particles (a)
The coverage f in (b) is calculated by the following equation.

[0035]

(Equation 3)

(Where f is the coverage (%), D_tIs the toner particle
Volume average particle diameter (μm), d_a, D _bIs inorganic fine powder
(A), the respective average particle diameters (μ) of the inorganic fine powder (b)
m), ρ_t, Ρ_a, Ρ_bIs toner particles, inorganic fine powder
(A), the true specific gravity of each of the inorganic fine powder (b) is shown.
You. ) Commercially available inorganic fine powder treated with dimethyl silicone oil
At the end (a), Japan Aerosil RY50, NY5
0, Nippon Silica SS50, SS50B, SS50F,
SS60, SS70 etc., dimethyl silicon oil
Nippon Aerosil Co., Ltd.
RY200, RY300, Cabot TG308F,
Wacker's H1018, etc.
Nippon Aerosil Co., Ltd.
R972, R974, R976, Cabot TG-3
09F, Wacker H15, H20, H30, etc.
Hexamethyldisilazane-treated inorganic fine powder (b)
And the Aerosil Nippon RX200, RX300, R8
12, Cabot TG-810G, TG-811F,
Wacker H1303VP, H2000, H3004
There is.

In the present invention, various other known organic or inorganic fine powders may be used as additives in order to improve the adhesiveness, cohesiveness, fluidity, pulverizability, chargeability and the like of the toner particles. Various lubricants such as polyethylene wax, oxidized / non-oxidized polypropylene wax, paraffin wax, carnauba wax, higher fatty acid, fatty acid amide, metal soap, silicone oil, etc. are used as additives which act as a release agent. And about 0.05 to 10 parts by weight with respect to 100 parts by weight of the resin.

As other external additives of the toner, various organic and inorganic fine particles known for the purpose of a resistance adjuster, an abrasive, a charge adjuster and the like can be mentioned. For example, fluorine such as polyvinylidene fluoride and polytetrafluoroethylene can be used. Resin powder, fatty acid metal salts such as zinc stearate and calcium stearate, resin beads containing polymethyl methacrylate and silicone resin as main components, minerals such as talc and hydrotalcite, and ferroelectrics such as strontium titanate Fine powder, conductive fine powder such as conductive titania, and the like can be given. These amounts are determined by the amount of toner particles 100
It is preferably 0.01 to 10 parts by weight based on parts by weight.

The non-magnetic toner according to the present invention can be produced by various production methods including a conventionally known method, and the following examples are given as general production methods. The resin, the charge control substance, the colorant, and the additives to be added as required are uniformly dispersed in the apparatus by a mixing device having a rotating portion such as a blade or a screw. As a mixing device,
A Henschel mixer manufactured by Mitsui Mining Co., a Reidge mixer manufactured by Matsubo, a Nauta mixer manufactured by Hosokawa Micron, a super mixer manufactured by Kawata, and a general V-type mixer in which the container itself rotates can be used.

The dispersion is kneaded, extruded,
Melt and knead with a roll mill. As a kneading apparatus, a continuous extruder, for example, a ZSP type extruder manufactured by W & P, a BU
General batch-type kneading machines such as a co-kneader manufactured by SS, a TEM extruder manufactured by Toshiba Machine Co., Ltd., a PCM extruder manufactured by Ikegai Co., Ltd., and Kneedex manufactured by Mitsui Mining Co., Ltd. can also be used. As a cooling device after the kneading, a drum cooler manufactured by Mitsui Mining Co./Mitsubishi Chemical Engineering Co., Ltd., a belt cooler manufactured by NBC Co., etc. can be used. The kneaded material is coarsely pulverized by a coarse pulverizer and then finely pulverized by a fine pulverizer. Examples of the pulverizer include jet mills such as an I-type / IDS-type jet mill manufactured by NPK and AFG / TJM manufactured by Hosokawa Micron; a hammer mill Fats Mill Feather Mill Inomaizer A manufactured by Hosokawa Micron
The toner is pulverized stepwise to a predetermined toner particle size by using an impact pulverizer such as a CM pulperizer, a turbo mill manufactured by Turbo Industries, KTM manufactured by Kawasaki Heavy Industries, a super rotor manufactured by Nisshin Engineering, and a fine mill manufactured by NPK.

The finely pulverized product is classified by a classifier. As a classifier, an air flow classifier having a rotary rotor in the machine, such as Alpine / Hosokawa Micron TSP, Nisshin Engineering Co., Ltd., Turboxifier, Condax / Mitsui Mining Co., CFS-HD, Donaldson Co., Ltd. Donasex, etc. Using a classifier DS / DSX manufactured by NPK, an elbow jet classifier manufactured by Nippon Mining Co., Ltd., a micron separator manufactured by Hosokawa Micron, etc., the toner is classified stepwise to a predetermined toner particle size. The coarse powder generated in the classification step may be reused after returning to the pulverization step or the first-stage classification step. Also,
The toner fine powder may be reused by returning to the raw material mixing step and the kneading step. In the case of external addition treatment, a predetermined amount of the classified product and various known external additives are blended, and the mixture is stirred and mixed with a Henschel mixer, a super mixer, or another high-speed stirrer that applies a shearing force to the powder.

In order to remove foreign matter and coarse particles, sieving is performed using a vibrating sieve such as a gyro shifter, a Sato vibrating sieve or an ultrasonic sieve, or a rotary sieve such as a turbo screener to obtain a final toner. be able to. Further, as a method completely different from the above-mentioned production method, for example, toner particles may be formed by a suspension polymerization method or an emulsion polymerization method, that is, a so-called polymerization toner method. The obtained toner has a softening temperature of 90 to 140 ° C. and a glass transition temperature of 50 to 70.
C. is preferred. If the softening temperature is lower than 90 ° C., the hot offset property deteriorates, and the mechanical strength decreases, which is not preferable. On the other hand, if it exceeds 140 ° C., the fixing property deteriorates, which is not preferable. When the glass transition temperature is lower than 50 ° C., toner aggregation and fixation are liable to occur. On the other hand, when the glass transition temperature is higher than 70 ° C., fixing strength is lowered, which is not preferable.

The softening temperature of the toner was measured using a flow tester (C
FT-500, manufactured by Shimadzu Corporation), and about 1 g of a sample was heated at a rate of 6 ° C./min. 1cm ² while heating with
A load of 20 kg / cm ² by the plunger of
It is extruded from a die having a hole diameter of 1 mm and a height of 1 mm, and a temperature corresponding to an intermediate point between the temperature at which the plunger starts to descend and the temperature at which it descends is defined as the softening temperature. Further, the glass transition temperature of the toner was once raised to 100 ° C. or more at a rate of 10 ° C./min using a differential scanning calorimeter (DSC).
It is cooled to room temperature by air cooling with a fan, and is again set to a temperature corresponding to an intersection where a tangent is drawn to an inflection point (shoulder) when the temperature is raised again.

The toner of the present invention is developed by a contact or non-contact non-magnetic one-component developing method in electrophotography, and then an image is formed by a heat fixing method in which the toner is brought into contact with a fixing roll having a built-in heat heater to fix the toner. It is useful when used in an electrophotographic recording device that performs In particular, it is more suitable for a color toner in a non-magnetic one-component developing system. Hereinafter, an example of an electrophotographic recording apparatus using the toner of the present invention will be described, but the present invention is not limited to this example. FIG. 1 is a schematic diagram of a main configuration of an electrophotographic recording apparatus, and includes a photoconductor 1, a charging device 2, an exposure device 3, a developing device 4, a transfer device 5, a cleaning device 6, and a fixing device 7.
have.

The photosensitive member 1 is formed of a conductor such as aluminum, for example, and has a photosensitive layer formed by coating a photosensitive conductive material on the outer peripheral surface. A charging device 2, an exposure device 3, a developing device 4, a transfer device 5, and a cleaning device 6 are arranged along the outer peripheral surface of the photoreceptor 1, respectively. The charging device 2 includes, for example, a well-known scorotron charger, a roller charger, and the like, and uniformly charges the surface of the photoconductor 1 to a predetermined potential. The exposure device 3 applies LE to the photosensitive surface of the photoconductor 1.
D, which forms an electrostatic latent image on the photosensitive surface of the photoconductor 1 by performing exposure with a laser beam or the like.

The developing device 4 includes an agitator 42, a supply roller 43, a developing roller 44, and a regulating member 45.
The toner T is stored therein. If necessary, the developing device may be provided with a replenishing device 41 for replenishing toner, and the replenishing device can replenish toner from containers such as bottles and cartridges.
The supply roller 43 is made of a conductive sponge or the like,
It is in contact with the developing roller 44. Developing roller 44
Is disposed between the photoconductor 1 and the supply roller 43. The developing roller 44 includes the photosensitive member 1 and the supply roller 4.
3 respectively. The supply roller 43 and the developing roller 44 are rotated by a rotation drive mechanism. The supply roller 43 carries the stored toner and supplies it to the developing roller 44. The developing roller 44 carries the toner supplied by the supply roller 43 and
Contact surface.

The developing roller 44 is made of iron, stainless steel,
It is made of a metal roll of aluminum, nickel or the like, or a resin roll in which a metal roll is coated with a silicone resin, a urethane resin, a fluororesin, or the like. The surface of the developing roll may be smoothed or roughened as necessary. The regulating member 45 is made of a resin blade such as silicone resin or urethane resin, stainless steel, aluminum,
It is formed of a metal blade of copper, brass, phosphor bronze, or the like, a metal blade coated with a resin, or the like. The regulating member 45 is in contact with the developing roller 44 and is pressed against the developing roller 44 by a predetermined force (a general blade linear pressure is 5 to 500 g / cm) by a spring or the like. A function of imparting charge to the toner by frictional charging may be provided.

The agitator 42 is rotated by a rotary drive mechanism, and agitates the toner and conveys the toner to the supply roller 43 side. A plurality of agitators may be provided with different blade shapes, sizes, and the like.
The transfer device 5 includes a transfer charger, a transfer roller, a transfer belt, and the like that are arranged to face the photoconductor 1. The transfer device 5 applies a predetermined voltage value (transfer voltage) having a polarity opposite to the charging potential of the toner, and transfers the toner image formed on the photoconductor 1 to the paper P. The cleaning device 6 is composed of a cleaning member such as a urethane blade or a fur brush. The cleaning device 6 scrapes residual toner adhered to the photoreceptor 1 with the cleaning member and collects the residual toner.

The fixing device 7 comprises an upper fixing member 71 and a lower fixing member 72, and has a heating device 73 inside the upper or lower fixing member. As the fixing member, a known heat fixing member such as a fixing roll in which a metal tube of stainless steel, aluminum or the like is coated with silicon rubber, a fixing roll in which Teflon (registered trademark) resin is coated, a fixing sheet, and the like can be used. Further, a releasing agent such as silicone oil may be supplied to the fixing member to improve the releasing property. Further, a mechanism for forcibly applying pressure to the upper fixing member and the lower fixing member by a spring or the like may be employed. When the toner transferred onto the paper P passes between the upper fixing member 71 and the lower fixing member 72 heated to a predetermined temperature, the toner is heated to a molten state, cooled after passing through, and cooled on the paper P. The toner is fixed.

In the electrophotographic developing apparatus configured as described above, an image is recorded as follows. That is, first, the surface (photosensitive surface) of the photoconductor 1 is charged to a predetermined potential (for example, −600 V) by the charging device 2. continue,
The charged photosensitive surface of the photoreceptor 1 is exposed by the exposure device 3 in accordance with an image to be recorded, and an electrostatic latent image is formed on the photosensitive surface. Then, the developing device 4 develops the electrostatic latent image formed on the photosensitive surface of the photosensitive member 1. In the developing device 4, the toner supplied by the supply roller 43 is thinned by the developing blade 45, and is triboelectrically charged to a predetermined polarity (here, the same polarity as the charging potential of the photoreceptor 1, and negative polarity). Then, it is carried on the developing roller 44, transported, and brought into contact with the surface of the photoconductor 1.

From the developing roller 44, a toner image corresponding to the electrostatic latent image is formed on the surface of the photosensitive member 1 by a so-called reversal developing method. Then, the toner image is transferred to the sheet P by the transfer device 5. Thereafter, the toner remaining on the photosensitive surface of the photoconductor 1 without being transferred is removed by the cleaning device 6. The final image is obtained by passing the toner on the sheet P through the fixing device 7 and thermally fixing the toner.

[0052]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the invention. In addition, in each of Examples and Comparative Examples, “parts” simply means “parts by weight”.

[0053]

Example 1 100 parts of linear polyester resin A Softening temperature: 106 ° C., glass transition temperature: 62 ° C. Acid value: 10 KOH mg / g Hydroxyl value: 37 KOH mg / g Mn: 3100, Mw: 7700 Charge control 1 part of LR-147 manufactured by Nippon Carlit Co., Ltd. 10 parts of cyan master batch pigment 10 parts of cyan pigment C.I. I. PigmentBlue 15: 3 40 parts and linear polyester resin A 60 parts are subjected to a master batch treatment and pulverized into a 2 mm pass. Low molecular weight wax 0.5 parts by NP-056 manufactured by Mitsui Chemicals, Inc.

The above composition is premixed with a high-speed stirrer, kneaded with a twin-screw continuous extruder, and then rapidly cooled while rolling with two rolls. The cooled product was coarsely pulverized by a feather mill until it passed the 2 mm line, and then adjusted to a volume average particle diameter of about 8.2 μm by a jet pulverizer / airflow classifier to obtain a classified toner. The particle size was measured with a Coulter Multisizer. The softening temperature of the toner was 100 ° C., and the glass transition temperature was 62 ° C. Next, classification toner 1
00 parts and 1.5 parts of RY50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer, and 0.5 part of R812 silica manufactured by Nippon Aerosil Co., Ltd. were further added and mixed to prepare cyan toner aC1. This toner is transferred to a commercially available color printer of an intermediate transfer mechanism (in the case of plain paper, the set fixing temperature 15
Table 1 shows the evaluation results of continuous printing of 6000 sheets using 0 ° C., A4 plain paper color printing speed: 4 sheets / min, non-magnetic one-component contact developing method. Was maintained.

Example 2 Classified Toner 100 of Example 1
Of RY50 silica manufactured by Nippon Aerosil Co., Ltd. and 1.5 parts of RY50 silica manufactured by Nippon Aerosil Co., Ltd.
0.5 part of 74 silica was added and further mixed to prepare a cyan toner aC2. Example 3 100 parts of the classified toner of Example 1 and 1.5 parts of RY50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer, and 0.3 part of R812 silica manufactured by Nippon Aerosil Co., Ltd. were further added and mixed. The toner aC3 was adjusted. [Example 4] 100 parts of the classified toner of Example 1 and 1.5 parts of NY50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer, and 0.5 part of TG-308F silica manufactured by Cabot was further added and mixed. The cyan toner aC4 was adjusted.

[0056]

Example 5 12 parts of magenta master batch pigment I. PigmentRed12
2 and 40 parts of the linear polyester resin A were subjected to a masterbatch treatment and pulverized into a 2 mm path.

A magenta toner aM1 was prepared in the same manner as in Example 1 except that the cyan masterbatch pigment of Example 1 was replaced with 12 parts of the above magenta masterbatch pigment.
Was adjusted. The softening temperature of the toner was 100 ° C., and the glass transition temperature was 63 ° C.

[0058]

Example 6 Yellow master batch pigment 10 parts Yellow pigment C.I. I. PigmentYello
40 parts of w17 and 60 parts of linear polyester resin A were subjected to a master batch treatment and pulverized into a 2 mm path.

The procedure of Example 1 was repeated, except that the yellow masterbatch pigment was replaced with 10 parts of the yellow masterbatch pigment in place of the cyan masterbatch pigment.
Was adjusted. The softening temperature of the toner was 100 ° C., and the glass transition temperature was 62 ° C.

[0060]

[Example 7]-100 parts of linear polyester resin A-3 parts of E-81 manufactured by Orient Chemical Industries-Carbon black 5 parts of MA-100S manufactured by Mitsubishi Chemical Corporation-Low molecular weight wax manufactured by Mitsui Chemicals NP-056 0.5 parts

A black toner a was prepared in the same manner as in Example 1 except that the cyan prescription of Example 1 was changed to the above-mentioned black prescription.
K1 was adjusted. The softening temperature of the toner was 101 ° C., and the glass transition temperature was 63 ° C. Example 8 100 parts of the classified toner of Example 1 and 1.5 parts of RX50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer.
5 parts were further added and mixed to prepare a cyan toner aC5. Table 1 shows the results of continuous printing by the printer A of Examples 1 to 8.
As shown in Table 1, the results were good in Examples 1 to 7, and almost good in Example 8. Comparative Example 1 100 parts of the classified toner of Example 1 and 1.5 parts of RY50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer to prepare a cyan toner aC6.

Comparative Example 2 Classified Toner 100 of Example 1
Part and 0.5 part of R812 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer to prepare cyan toner aC7. Comparative Example 3 100 parts of the classified toner of Example 1 and 0.5 parts of RX50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer.
5 parts were further added and mixed to prepare a cyan toner aC8.

Comparative Example 4 Classified Toner 100 of Example 1
And 0.2 parts of RY50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer.
2 Add 0.1 part of silica and mix.
C9 was adjusted. Table 1 shows the results of continuous printing on the printer A of Comparative Examples 1 to 4, but these were not satisfactory. In Comparative Example 1, streaks and unevenness occurred in the toner layer on the developing roll, the formation of the initial image was poor, and continuous printing was stopped. In Comparative Example 2, toner was scattered from the developing tank from the beginning, and the amount of consumed toner was remarkably large. In Comparative Example 3, toner was scattered from the developing tank after 500 sheets, the toner consumption was large, and the running out of toner was stopped soon after 3000 sheets. In Comparative Example 4, the toner layer on the developing roll had many irregularities and a uniform layer could not be formed, the initial image was poor, the toner scattered from the developing roll surface from the beginning, and continuous printing was stopped.

[0064]

[Table 5]

[0065]

Example 9 100 parts of nonlinear polyester resin B Softening temperature: 135 ° C., Glass transition temperature: 63 ° C. Acid value: 5 KOH mg / g, Hydroxyl value: 33 KOH mg / g Mn: 7200, Mw: 81,000 Magenta master batch pigment 10 parts Magenta pigment C. I. Pigment Red 57: 1: 40 parts and linear polyester resin C (softening temperature: 110 ° C., glass transition temperature: 63 ° C.) are subjected to master batch processing and pulverized into 2 mm passes. ・ Charge control agent Nippon Carlit LR-147 1 part ・ Low molecular weight wax NP-056 manufactured by Mitsui Chemicals, Inc. 2 parts

The above composition is premixed with a high-speed stirrer, kneaded with a twin-screw continuous extruder, and cooled rapidly while rolling with two rolls. The cooled product was coarsely pulverized by a feather mill until it passed the 2 mm line, and then adjusted to a volume average particle diameter of about 8.7 μm with a jet pulverizer / airflow classifier to obtain a classified toner. The particle size was measured with a Coulter Multisizer. The softening temperature of the toner is 125
℃, the glass transition temperature was 64 ℃. Then, 100 parts of the classified toner and RY50 silica manufactured by Nippon Aerosil Co., Ltd.
Eight parts were mixed with a Henschel mixer, and 0.2 part of R812 silica manufactured by Nippon Aerosil Co., Ltd. was further added and mixed to prepare black toner bM1. Table 1 shows the evaluation results of continuous printing of 6,000 sheets of this toner using a commercially available color printer B of a tandem mechanism (color printing speed of A4 plain paper: 12 sheets / min, non-magnetic one-component contact developing system). As shown, the image characteristics were excellent.

[0067]

[Example 10]-100 parts of non-linear polyester resin D Softening temperature: 150 ° C, Glass transition temperature: 65 ° C Acid value: 8KOHmg / g, Hydroxyl value: 30KOHmg / g Mn: 2400, Mw: 87,000・ Carbon black 4 parts of MA-100S manufactured by Mitsubishi Chemical Corporation ・ Charge control agent 1 part of T-77 manufactured by Hodogaya Chemical Industry ・ 1 part of low molecular weight wax PE130 manufactured by Clariant

A black toner bK1 was prepared in the same manner as in Example 9 except that the magenta prescription of Example 9 was changed to the above black prescription. The softening temperature of the toner was 140 ° C., and the glass transition temperature was 65 ° C.

Example 11 Classified Toner 1 of Example 10
00 parts and 1.8 parts of RY50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer.
0.2 parts of -308F silica was added and mixed to prepare a black toner bK2. Example 12 100 parts of the classified toner of Example 9 and 1.8 parts of RX50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer, and 0.2 part of R812 silica manufactured by Nippon Aerosil Co., Ltd. was further added and mixed. The toner bM2 was adjusted.

Example 13 Classified Toner 1 of Example 10
00 parts and 1.8 parts of RX50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer, and 0.2 part of R812 silica manufactured by Nippon Aerosil Co., Ltd. was further added and mixed to prepare black toner bK3. Comparative Example 5 100 parts of the classified toner of Example 9 and 0.2 parts of R812 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer to prepare a magenta toner bM3.

Comparative Example 6 Classified Toner 100 of Example 9
Parts and 0.5 parts of RX50 silica manufactured by Nippon Aerosil Co., Ltd. were mixed with a Henschel mixer.
1.5 parts of 12 silica was added and mixed to prepare a magenta toner bM4. Table 2 shows the results of continuous printing on the printer B of Comparative Examples 5 and 6, but these were not satisfactory. In Comparative Example 5, the image density was considerably high, the amount of toner consumption was considerably large, and the running out of toner was stopped at 3000 sheets. In Comparative Example 6, the image density was remarkably too high.
The toner consumption is remarkably large and the toner runs out quickly 2000
Canceled with a piece.

[0072]

[Table 8]

[0073]

[Table 9]

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a main configuration of an electrophotographic recording apparatus using a toner of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photoconductor 2 charging device 3 exposure device 4 developing device 5 transfer device 6 cleaning device 7 fixing device 42 agitator 43 supply roller 44 developing roller 45 regulating member 71 upper fixing member 72 lower fixing member 73 heating device T toner P paper

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G03G 9/08 375 (72) Inventor Takeshi Owada 1-Fukudacho, Joetsu-shi, Niigata Pref. Naoetsu Works, Mitsubishi Chemical Corporation (72) Inventor Masakazu Sugihara 1 Fukudacho, Joetsu City, Niigata Prefecture F-term in Naoetsu Works, Mitsubishi Chemical Corporation (reference) 2H005 AA01 AA08 AA21 AB10 CA08 CA12 CA21 CA22 CA25 CA26 CA30 CB07 CB13 CB18 DA02 DA05 EA03 EA05 EA07 EA10 FA07 2030 AB02 AD01 BB23 BB63

Claims (13)

[Claims] 1. at least a binder resin, a colorant, and a negative charge
Toner particles containing charge control agent and BET specific surface
Product 80m^Two/ G silane coupling agent or silico
Fine powder (a) treated with oil and BET specific surface
Product 80m^Two/ G or more of silane coupling agent or silica
Non-magnetic containing inorganic fine powder (b) treated with oil
100 parts by weight of toner particles
On the other hand, the addition weight part (W) of the inorganic fine powder (a)_a) And inorganic fine
Addition part by weight of powder (b) (W_b) Satisfies the following relational expression
A non-magnetic one-component toner. (Equation 1)(Where f is the coverage (%), D_tIs the volume average of the toner particles
Particle size (μm), d_a, D _bIs inorganic fine powder (a), inorganic fine powder
Average particle size (μm) of each powder (b), ρ_t,
ρ_a, Ρ_bDenotes toner particles, inorganic fine powder (a), inorganic fine powder
(B) represents the true specific gravity of each. ) 2. A toner having at least a binder resin, a colorant, and a negatively chargeable charge controlling agent has a BET surface area of 80 m ^2.
Powder (a) treated with less than 1 g / g of silicone oil
^2. The non-magnetic one-component toner according to claim 1, wherein an inorganic fine powder (b) treated with a silane coupling agent or silicone oil having a BET specific surface area of 80 m ² / g or more is externally added. . 3. The method according to claim 1, wherein said coverage ratio f satisfies 30 ≦ f ≦ 200 and W _a −W _b ≧ 0.3.
Or the non-magnetic one-component toner according to item 2. 4. The method according to claim 1, wherein the core particles of the inorganic fine powder (a) and the inorganic fine powder (b) are each independently selected from the group consisting of silica, titania, and alumina. The non-magnetic one-component toner according to claim 1. 5. The softening temperature of the binder resin is 80 to 160.
° C, a glass transition temperature of 50 to 75 ° C, and an acid value of 3
The non-magnetic one-component toner according to claim 1, wherein the non-magnetic one-component toner is a polyester of 0 KOH mg / g or less. 6. The non-magnetic one-component toner according to claim 1, wherein the colorant is an acidic carbon black having an ultraviolet absorbance of 0.05 or less. 7. The method according to claim 1, wherein the colorant is at least C.I. I. 6. The non-magnetic one-component toner according to claim 1, further comprising a blue pigment selected from CI Pigment Blue 15: 3 and 15: 4. 8. The method according to claim 1, wherein the colorant is at least C.I. I. Pigment Red 571, 122, 146, 184,
The non-magnetic one-component toner according to any one of claims 1 to 5, further comprising a red or red pigment selected from 238 or Pigment Violet 19. 9. The method according to claim 1, wherein the colorant is at least C.I. I. Pigment Yellow 13, 17, 74, 93, 15
6. The non-magnetic one-component toner according to claim 1, further comprising a yellow pigment selected from 0, 155, 180, and 185. 10. The negatively chargeable charge control agent is selected from the group consisting of a metal-containing azo compound, a metal-containing salicylic acid compound, a metal-containing alkyl salicylic acid compound, a metal-containing benzylic acid compound, and a phenolamide compound. 10. The non-magnetic 1 according to claim 1, which is an agent.
Component toner. 11. A non-magnetic one-component developing method using the non-magnetic one-component toner according to claim 1, wherein a developing roller and a photosensitive member are in contact with each other. One-component development method. 12. The image forming method according to claim 11, wherein a full-color image is formed by a tandem method in the image forming method. 13. In the tandem system, cyan,
13. The image forming method according to claim 12, wherein the developing units for the three primary color toners of magenta and yellow are located in front, and the developing unit for the black toner is located after the color developing unit.