JP2002091077A - Toner and image forming method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toner which can realize energy saving and quick printing and which has enough low temperature fixing property. SOLUTION: The toner is um used for the image forming method by which a toner image is thermally fixed to a recording material while rotating, heating and pressing the recording material by an electromagnetic induction heating system. The toner is made of a composition containing at least a binder resin and coloring agent. The binder resin of the toner composition is polyester resin having 10 to 60 mass% tetrahydrofuran(THF) insoluble content and 1 to 100 mgKOH/g acid value. The toner contains a metal compound and has 5×104 to 1×107 Pa.s melt viscosity (V100) at 100 deg.C with the change rate of the melt viscosity from 100 deg.C to 140 deg.C (V100/V140) being <=103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner used in a recording method utilizing an electrophotographic method, an electrostatic recording method, an electrostatic printing method or a toner jet recording method, and an image forming method using the toner.

[0002]

2. Description of the Related Art An electrophotographic method is disclosed in U.S. Pat.
Numerous methods are known as described in Japanese Patent Publication No. 7,691, Japanese Patent Publication No. 42-23910 and Japanese Patent Publication No. 43-24748. Generally, a photoconductive substance is used to form an electrostatic charge image on a photoreceptor by various means,
Next, the electrostatic image is developed using a toner, and a toner image is transferred to a transfer material such as paper as necessary. Then, the toner image is fixed to the transfer material by heating, pressure, heating and pressurizing, or solvent vapor to form a toner image. What you get.

Various methods and apparatuses have been developed for the final step of fixing a toner image on a sheet as a transfer material. At present, the most common method is a compression heating method using a fixed heating heater via a heat roller or a heat-resistant film.

In this fixing device, the fixing roller is formed in a hollow shape, and a heating element is held on a center axis of the fixing roller by holding means. The heating element is composed of, for example, a tubular heating heater such as a halogen lamp, and generates heat when a predetermined voltage is applied. Since the halogen lamp is located at the center axis of the fixing roller, heat generated from the halogen lamp is uniformly radiated to the inner wall of the fixing roller, and the temperature distribution of the outer wall of the fixing roller becomes uniform in the circumferential direction. The outer wall of the fixing roller has a temperature suitable for fixing (for example, 150 to 2).
(00 ° C.).

In this state, the fixing roller and the pressure roller rotate in opposite directions while being in pressure contact with each other, and sandwich the sheet on which the toner has adhered. At a pressure contact portion (hereinafter, referred to as a nip portion) between the fixing roller and the pressure roller, the toner on the sheet is melted by the heat of the fixing roller, and is fixed to the sheet by the pressure applied from both rollers.

However, in the above-described fixing device having a heating element composed of a halogen lamp or the like, since the fixing roller is heated using radiant heat from the halogen lamp,
After turning on the power, a relatively long time is required until the temperature of the fixing roller reaches a predetermined temperature suitable for fixing (hereinafter referred to as a warm-up time). During that time, the user cannot use the copier, and there is a problem that the user has to wait for a long time.

On the other hand, if a large amount of power is applied to the fixing roller in order to shorten the warm-up time and improve the operability of the user, the power consumption of the fixing device increases, which is against energy saving. Had occurred. For this reason, in order to increase the value of products such as copiers, attention has been paid to achieving both energy saving (low power consumption) of the fixing device and improvement of user operability (quick print) at the same time. Have been.

[0008] Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent Application Laid-Open No. 9-33787, an induction heating type fixing device using high frequency induction as a heating source has been proposed. In this induction heating fixing device, a coil is arranged concentrically inside a hollow fixing roller made of a metal conductor, and an induced eddy current is generated in the fixing roller by a high-frequency magnetic field generated by applying a high-frequency current to this coil. The fixing roller itself generates Joule heat by the skin resistance of the fixing roller itself. According to the fixing device of the induction heating system, the electric-heat conversion efficiency is extremely improved, so that the warm-up time can be reduced.

By combining a coil with a core (magnetic field blocking member) made of a magnetic material, a high-frequency magnetic field can be efficiently generated. In particular, when a core having a T-shaped cross section is used, the amount of heat required for the fixing device can be generated with low power due to the effective concentration of the high-frequency magnetic field and the effect of shielding the magnetic field from a portion other than the heat generating portion. However, in the case of the above-described conventional technology, the following problems have occurred.

In the above-described induction heating type fixing device, in order to take advantage of the feature that the time required for the surface temperature of the fixing roller to reach an appropriate temperature for fixing at the time of starting the fixing device can be shortened, the fixing roller must be used. It is better that the heat capacity is as small as possible. Therefore, if a thin fixing roller is used, it is difficult to set the pressing force at the fixing nip portion high due to the rigidity of the fixing member, and it is difficult to set the fixing temperature low. Further, in this case, it is difficult to transfer heat in the rotation axis direction of the fixing roller. For example, when small-sized paper is continuously passed, the difference in the fixing roller temperature between the paper passing portion and the non-paper passing portion increases. Cheap. At this time, if the temperature is adjusted in the paper passing portion of the fixing roller, the temperature of the non-paper passing portion greatly exceeds the temperature suitable for fixing. Toner offset is likely to occur. For this reason, the performance required of the toner applied to such a fixing method is becoming higher than that of other fixing methods, and further improvement of the fixing property and the anti-offset property is required. .

Conventionally, vinyl resins such as polyester resins and styrene resins have been mainly used as toner resins. Polyester resins originally have excellent low-temperature fixability as compared with vinyl copolymers, but also have the problem that offset phenomenon easily occurs at high temperatures. Attempts have been made to improve the viscoelastic properties by increasing the molecular weight of the polyester resin in order to compensate for this problem, but it cannot be said that such a fixing device has sufficient properties.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a toner and an image forming method which solve the above-mentioned problems.

An object of the present invention is to provide a low-temperature to high-speed excellent low-temperature fixing property and high-temperature offset resistance even when a toner image on a recording material is heated and fixed by an electromagnetic induction heating method to form a fixed image on the recording material. It is an object of the present invention to provide a toner having a property and an image forming method.

It is a further object of the present invention to provide a toner and an image forming method capable of achieving both energy saving (low power consumption) of a fixing device and improvement of user operability (quick print). It is in.

[0015]

The present invention provides (1) a magnetic field generating means, (2) a rotary heating member containing at least a heating layer and a release layer heated by electromagnetic induction, and (3) the rotary heating member. Using a heating and pressing means having at least a member and a rotary pressing member forming a nip, the toner image on the recording material is pressed while pressing the rotary pressing member via the recording material. And a toner applied to an image forming method of forming a fixed image on a recording material by heat-fixing the toner. The toner is a toner formed of a composition containing at least a binder resin and a colorant. The binder resin of the composition has a tetrahydrofuran (THF) insoluble content of 10% by mass.
And an acid value of 1 mgKOH / g to 1%.
A polyester resin of 100 mg KOH / g, wherein the toner has a metal compound,
Melt viscosity (V ₁₀₀ ) at 5 × 10 ⁴ Pa · s to 1
× 10 ⁷ Pa · s.
The present invention relates to a toner characterized in that the rate of change in melt viscosity at 0 ° C., V ₁₀₀ / V _140, is 10 ³ or less.

Further, the present invention is an image forming method for forming a fixed image on a recording material by heating and fixing a toner image on a recording material by a heating and pressing means. A toner formed of a composition containing at least a binder resin and a colorant, wherein the binder resin of the toner composition has a tetrahydrofuran (THF) insoluble content of 10%.
% To 60% by mass, acid value is 1mgKOH / g
To 100 mgKOH / g, wherein the toner has a metal compound and
Melt viscosity (V ₁₀₀ ) at 00 ° C. is 5 × 10 ⁴ Pa · s
To 1 × a 10 ⁷ Pa · s, the rate of change V ₁₀₀ / V ₁₄₀ melt viscosity at 140 ° C. from 100 ° C. of the toner is 10 ³
The heating means includes: (1) a magnetic field generating means;
(2) a heating / pressurizing means having at least a rotary heating member containing at least a heat generating layer and a release layer heated by electromagnetic induction, and (3) a rotary pressing member forming a nip with the rotary heating member. The present invention relates to an image forming method for forming a fixed image on a recording material by heating and fixing a toner image on the recording material while pressing the rotary heating member via the recording material.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The toner of the present invention comprises (1) a magnetic field generating means, (2) a rotary heating member containing at least a heating layer and a release layer heated by electromagnetic induction, and (3) a rotary heating member. Using a heating and pressing means having at least a member and a rotary pressing member forming a nip, the toner image on the recording material is pressed while pressing the rotary pressing member via the recording material. Is applied to an image forming method of forming a fixed image on a recording material by heat fixing. In particular, the thickness of the heating layer of the rotary heating member is 0.01 to 20 mm, and the nip width formed by the rotary heating member and the rotary pressing member is 1 mm.
And a fixing speed of 10 to 500 mm / sec while pressing the rotary heating member at a linear pressure of 10 ³ to 10 ⁵ N / m via the recording material. It is suitably applied to an image forming method for fixing under heat and pressure.

The inventor of the present invention has stipulated that the toner applied to the image forming method of forming a fixed image on a recording material by heating and fixing the toner image on the recording material by the electromagnetic induction heating method as described above is relatively small. By using a toner having a low melt viscosity at a low temperature and a small change rate of the melt viscosity even when the temperature is increased, it is possible to achieve a toner and an image forming method capable of achieving both low power consumption and quick printing. Thus, the present invention has been completed.

In the present invention, a polyester resin having a sharp melt property is used as a binder resin, and a metal compound is further contained. A partial cross-linking reaction occurs, and a toner containing a low-viscosity polyester resin component and a high-molecular-weight component containing a THF-insoluble component can be produced. As a result, a toner having a melt viscosity characteristic suitable for the electromagnetic induction heating method can be prepared.

The melt viscosity of the toner in the present invention is 10
The melt viscosity at 0 ° C. (V ₁₀₀ ) is 5 × 10 ⁴ Pa · s to 1 × 10 ⁷ Pa · s, preferably 5 × 10 ⁴ Pa · s to 5 × 10 ⁶ Pa · s. change rate V ₁₀₀ / V ₁₄₀ melt viscosity at 140 ° C. from ° C. is required to be 10 ³ or less. If the melt viscosity at 100 ° C. is greater than 1 × 10 ⁷ Pa · s, the low-temperature fixability deteriorates, so the fixing set temperature must be increased or the pressure applied during fixing must be increased. In such a case, the time required for the first copy or the first print is increased, and the life of the fixing member is shortened. Further, it the rate of change in melt viscosity at 140 ° C. from ₁₀₀ ℃ V 100 / V ₁₄₀ is larger than 10 ^3, when the temperature of the fixing member becomes uneven, liable to generate offset at high temperatures Also, paper or the like may be wrapped around the fixing member, and paper jams may easily occur.

In the present invention, the THF-insoluble content contained in the resin in the toner is 10 to 60% by mass, preferably 20% by mass.
To 50% by mass. If the THF-insoluble content is less than 10% by mass, the rate of change of the melt viscosity increases, and offset is likely to occur. On the other hand, if it is more than 60% by mass, the viscosity at low temperature increases, and the low-temperature fixability deteriorates.

The acid value of the resin in the toner of the present invention is 1 mg
KOH / g to 100mgKOH / g, preferably 5m
It needs to be from gKOH / g to 80 mgKOH / g. When the acid value of the resin is less than 1 mgKOH / g,
The crosslinking reaction between the resin and the metal compound becomes difficult to occur, and T
It becomes difficult to contain HF insolubles, and it becomes difficult to control the viscosity of the toner at high temperatures. Further, since the wettability is reduced, the cleaning property from the fixing member is reduced, and the life of the fixing member is shortened. When the acid value exceeds 100 mgKOH / g, a large amount of low molecular weight components are contained in the resin, the rate of change in melt viscosity increases, and offset and the like are likely to occur.

The monomers of the polyester resin used in the present invention as described above include the following.

As the alcohol component, ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, diethylene glycol, triethylene glycol,
1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, 2-ethyl-1,3-hexanediol, hydrogenated bisphenol A, bisphenol derivative represented by the following formula (A), and formula (B) The diols shown are mentioned.

[0025]

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[0026]

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The divalent carboxylic acid containing 50 mol% or more of the total acid component includes benzenedicarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid and phthalic anhydride or anhydrides thereof; succinic acid, adipic acid, sebacine acid,
Alkyl dicarboxylic acids such as azelaic acid or anhydrides thereof, and succinic acids or anhydrides further substituted with alkyl groups having 6 to 18 carbon atoms; unsaturated dicarboxylic acids such as fumaric acid, maleic acid, citraconic acid, itaconic acid Or an anhydride thereof.

Glycerin, pentaerythritol,
Examples include sorbitol, sorbitan, and polyhydric alcohols such as oxyalkylene ether of novolak type phenol resin; and polyvalent carboxylic acids such as trimellitic acid, pyromellitic acid, benzophenonetetracarboxylic acid, and anhydride thereof.

In the toner of the present invention, the polyester unit of the binder resin is preferably crosslinked with a trivalent or higher polyhydric carboxylic acid or polyhydric alcohol, and the crosslinking components include trimellitic anhydride and benzophenonetetracarboxylic acid. , Pentaerythritol, and oxyalkylene ether of a novolak type phenol resin are preferred.

Further, the toner of the present invention needs to contain a metal compound in the toner. As the metal compound, a compound having reactivity with a carboxyl group in the polyester resin is selected, and examples thereof include an organic metal complex, a metal salt, and a chelate compound. Examples of such a complex include an acetylacetone metal complex, a hydroxycarboxylic acid metal complex, a polycarboxylic acid metal complex, and a polyol metal complex.

It is preferable that such a metal compound is contained in an amount of 0.1 to 10 parts by mass per 100 parts by mass of the binder resin in the toner. When the amount is less than 0.1 part by mass, the crosslinking reaction with the resin is difficult to occur. When the amount is more than 10 parts by mass, it is difficult to control the crosslinking reaction, and it is difficult to control the melt viscosity of the toner.

The toner of the present invention may be a magnetic toner or a non-magnetic toner. In the case of a magnetic toner, the following magnetic materials are used for charging,
It is preferable for reasons such as fluidity and uniformity of copy density.

As a magnetic material also used as a coloring agent,
Iron oxides such as magnetite, maghemite, ferrite, and magnetic iron oxides containing other metal oxides; Fe, C
metals such as o and Ni, or these metals and A
1, Co, Pb, Mg, Ni, Sn, Zn, Sb, B
Alloys with metals such as e, Bf, Cd, Ca, Mn, Se, Ti, W, V, and mixtures thereof, and the like. Conventionally, ferric oxide (Fe ₃ O ₄ ), iron sesquioxide (γ-
Fe ₂ O ₃ ), zinc iron oxide (ZnFe ₂ O ₄ ), yttrium iron oxide (Y ₃ Fe ₅ O ₁₂ ), cadmium iron oxide (Cd ₃
Fe ₂ O ₄ ), iron gadolinium oxide (Gd ₃ Fe ₅ O ₁₂ ),
Iron oxide steel (CuFe ₂ O ₄ ), lead oxide (PbFe)
₁₂ O ₁₉ ), nickel iron oxide (NiFe ₂ O ₄ ), iron neodymium (NdFe ₂ O ₃ ), barium iron oxide (BaFe ₁₂
O ₁₉ ), magnesium iron oxide (MgFe ₂ O ₄ ), iron manganese oxide (MnFe ₂ O ₄ ), lanthanum iron oxide (LaFe)
O ₃ ), iron powder (Fe), cobalt powder (Co), nickel powder (Ni) and the like are known. The above-mentioned magnetic materials are used alone or in combination of two or more. Particularly preferred magnetic materials are fine powders of triiron tetroxide or gamma iron sesquioxide.

These ferromagnetic materials have an average particle size of 0.05 to
At 2 μm, the magnetic properties at 795.8 kA / m applied are coercive force of 1.6 to 12.0 kA / m and saturation magnetization of 50 to 200 A
m ² / kg (preferably 50 to 100 Am ² / kg) and a remanent magnetization of ^{2 to 20} Am ² / kg are preferable.

The magnetic material is used in an amount of 10 to 200 parts by mass, preferably 20 to 15 parts by mass, based on 100 parts by mass of the binder resin.
It is preferable to add 0 parts by mass.

When the toner of the present invention is used as a non-magnetic toner, any suitable pigment or dye can be used as a colorant.

As the dye, C.I. I. Direct Red 1, C.I. I. Direct Red 4, C.I. I. Acid Red 1, C.I. I. Basic Red 1, C.I. I. Modant Red 30, C.I. I. Direct Blue 1, C.I.
I. Direct Blue 2, C.I. I. Acid blue 9,
C. I. Acid Blue 15, C.I. I. Basic Blue 3, C.I. I. Basic Blue 5, C.I. I. Modant Blue 7, C.I. I. Direct Green 6, C.I. I.
Basic Green 4, C.I. I. Basic Green 6
Etc. As pigments, graphite, cadmium yellow,
Mineral Fast Yellow, Navel Yellow, Naphthol Yellow S, Hansa Yellow G, Permanent Yellow NCG, Tartrazine Lake, Red Lead Yellow, Molybdenum Orange, Permanent Orange GTR, Pyrazolone Orange, Benzidine Orange G, Cadmium Red,
Permanent Red 4R, Watching Red Calcium Salt, Eosin Lake, Brilliant Carmine 3B, Manganese Purple, Fast Violet B, Methyl Violet Lake, Navy Blue, Cobalt Blue, Alkaline Blue Lake, Victoria Blue Lake, Phthalocyanine Blue,
First Sky Blue, Indanthrene Blue BC,
Chrome green, chromium oxide, pigment green B,
Malachite Green Lake, Final Yellow Green G, etc.

When the toner of the present invention is used as a toner for forming a full-color image, the following colorants may be used. Examples of the magenta coloring pigment include C.I. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
11, 12, 13, 14, 15, 16, 17, 18, 1
9, 21, 22, 23, 30, 31, 32, 37, 3
8,39,40,41,48,49,50,51,5
2,53,54,55,57,58,60,63,6
4,68,81,83,87,88,89,90,11
2,114,122,123,163,202,20
6,207,209, C.I. I. Pigment Violet 19, C.I. I. Butt Red 1,2,10,13,1
5, 23, 29, 35 and the like.

Although the above magenta pigment may be used alone, it is more preferable to use a dye and a pigment in combination to improve the sharpness from the viewpoint of the image quality of a full-color image. Magenta dyes include C.I. I. Solvent Red 1,
3, 8, 23, 24, 25, 27, 30, 49, 81,
82, 83, 84, 100, 109, 121, C.I. I.
Disperse Red 9, C.I. I. Solvent Violet 8, 13, 14, 21, 27, C.I. I. Oil-soluble dyes such as Disperse Violet 1, C.I. I. Basic Red 1,2,9,12,13,14,15,17,1
8, 22, 23, 24, 27, 29, 32, 34, 3
5, 36, 37, 38, 39, 40, C.I. I. Basic violet 1,3,7,10,14,15,21,
And basic dyes such as 25, 26, 27 and 28.

Examples of the coloring pigment for cyan include C.I. I. Pigment Blue 2, 3, 15, 16, 17, C.I. I. Bat Blue 6, C.I. I. Acid Blue 45 or a copper phthalocyanine pigment in which 1 to 5 phthalimidomethyl groups are substituted on a phthalocyanine skeleton having the following structure.

[0041]

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The coloring pigments for yellow include C.I. I. Pigment Yellow 1,2,3,4,5,6,7,10,
11, 12, 13, 14, 15, 16, 17, 23, 3
5, 73, 83, C.I. I. Bat Yellow 1,3,20
And the like.

The coloring agent is based on 100 parts by mass of the resin component.
0.1 to 60 parts by mass is preferable, and more preferably 0.5 to 60 parts by mass.
５０50 parts by mass.

In the present invention, if necessary, one or more waxes may be contained in the toner particles as a release agent.

Examples of such waxes include aliphatic hydrocarbon waxes such as low molecular polyethylene, low molecular polypropylene, microcrystalline wax and paraffin wax; aliphatic hydrocarbon waxes such as oxidized polyethylene wax; Block copolymers of these aliphatic hydrocarbon waxes; waxes mainly containing fatty acid esters such as carnauba wax, sasol wax and montanic acid ester wax; and some or all of fatty acid esters such as deoxidized carnauba wax. Deoxidized. Further, saturated straight-chain fatty acids such as palmitic acid, stearic acid, montanic acid, or long-chain alkyl carboxylic acids having a longer-chain alkyl group; prandic acid, eleostearic acid,
Unsaturated fatty acids such as vinaric acid; saturated alcohols such as stearic alcohol, aralkyl alcohol, behenyl alcohol, carnaubayl alcohol, ceryl alcohol, melisyl alcohol, or long chain alkyl alcohols having a longer chain alkyl group; sorbitol Fatty acid metal salts such as calcium stearate, calcium laurate, zinc stearate, and magnesium stearate (commonly referred to as metal soaps); aliphatic hydrocarbon waxes and vinyl such as styrene and acrylic acid Waxes grafted with a series of monomers; partially esterified products of a fatty acid such as behenic acid monoglyceride and a polyhydric alcohol; methyl having a hydroxyl group obtained by hydrogenation of vegetable fats and oils Ester compounds.

As the wax particularly preferably used in the present invention, an aliphatic hydrocarbon wax is exemplified. For example, a low molecular weight alkylene polymer obtained by radical polymerization of alkylene under high pressure or a Ziegler catalyst under low pressure; an alkylene polymer obtained by thermally decomposing a high molecular weight alkylene polymer; Preferred is a synthetic hydrocarbon wax obtained from a hydrocarbon distillation residue obtained by the method or by hydrogenating them. Further, those obtained by separating a hydrocarbon wax by use of a press sweating method, a solvent method, vacuum distillation or a separation crystallization method are more preferably used. The hydrocarbon as a base is synthesized by a reaction between carbon monoxide and hydrogen using a metal oxide-based catalyst (often a multi-component system) [for example, the Zintol method, the hydrochol method (using a fluidized catalyst bed). Compound); hydrocarbons having a carbon number of up to about several hundreds obtained by the Aggé method (using the same low catalyst bed), in which a large amount of waxy hydrocarbons are obtained; alkylene such as ethylene, and a Ziegler catalyst Is preferred because it is a linear hydrocarbon having a small number of branches, a small number of branches and a long saturation. Particularly, a wax synthesized by a method not based on the polymerization of alkylene is preferable in view of its molecular weight distribution.

The wax used in the present invention has an endothermic main peak in a temperature range of 70 to 140 ° C. in a DSC curve of the toner containing the wax measured by a differential scanning calorimeter, which indicates that the toner is fixed at a low temperature. It is preferable in view of the properties and the high-temperature offset resistance.

The wax is used in an amount of 0.1 to 20 parts by mass, preferably 0.5 to 10 parts by mass, per 100 parts by mass of the binder resin.

The wax is usually added to the binder resin by dissolving the resin in a solvent, raising the temperature of the resin solution, and adding and mixing while stirring, or by mixing at the time of kneading.

In the toner of the present invention, a charge control agent can be used if necessary in order to further stabilize the charge amount. The charge control agent is used in an amount of 0.1 to 10 parts by mass, preferably 0.1 to 5 parts by mass, per 100 parts by mass of the resin component. Examples of the charge control agent include the following.

As the negatively charged one, for example, an organic metal complex or a chelate compound is effective. Examples thereof are a monoazo metal complex; an acetylacetone metal complex; a metal complex of an aromatic hydroxycarboxylic acid or an aromatic dicarboxylic acid. And phenol derivatives such as metal salts, anhydrides, esters and bisphenols thereof.

Examples of substances which are controlled to have a positive charge include denatured products such as nigrosine and fatty acid metal salts; and quaternary ammonium salts such as tributylbenzylammonium-1-hydroxy-4-naphthosulfonate and tetrabutylammonium tetrafluoroborate. And onium salts such as phosphonium salts, which are analogs thereof, and their lake pigments; triphenylmethane dyes and these lake pigments (phosphorotungstic acid, phosphomolybdate acid, phosphotungsten molybdate acid, Tannic acid, lauric acid, gallic acid, ferricyanic acid, ferrocyanide compound, etc.); metal salts of higher fatty acids; cyorganotin oxides such as dibutyltin oxide, dioctyltin oxide, dicyclohexyltin oxide;
Examples include organotin borates such as dibutyltin borate, dioctyltin borate, and dicyclohexyltin borate. These can be used alone or in combination of two or more. Of these, charge control agents such as nigrosine compounds and quaternary ammonium salts are particularly preferably used.

A fluidity improver may be added to the toner of the present invention. The fluidity improver can be added to the toner particles to increase the fluidity before and after the addition. For example, fluororesin powders such as vinylidene fluoride fine powder and polytetrafluoroethylene fine powder; fine powder silica such as wet-process silica and dry-process silica, fine powder titanium oxide, fine powder alumina, a silane coupling agent thereof, Titanium coupling agents, treated silica surface-treated with silicone oil, and the like are available.

Preferred fluidity improvers are fine powders produced by the vapor phase oxidation of silicon halides, and are so-called dry silica or fumed silica. For example, it utilizes the thermal decomposition oxidation reaction of silicon tetrachloride gas in an oxyhydrogen flame, and the basic reaction formula is as follows.

SiCl ₄ + 2H ₂ + O ₂ → SiO ₂ + 4HCl

In this manufacturing process, it is possible to obtain a composite fine powder of silica and another metal oxide by using another metal halide such as aluminum chloride or titanium chloride together with the silicon halide. They are also included. The particle size is preferably in the range of 0.001 to 2 μm as an average primary particle size, and particularly preferably, fine silica powder in the range of 0.002 to 0.2 μm is used. .

Commercially available silica fine powder produced by vapor-phase oxidation of a silicon halide compound includes, for example, those commercially available under the following trade names.

AEROSIL (Nippon Aerosil) 130 200 300 380 TT600 MOX170 MOX80 COK84 Ca-O-SiL (CABOT Co.) M-5 MS-7 MS-75 HS-5 EH-5 Wacker HDK N20 V15 (WACKER) -CHEMIE GMBH) N20E T30 T40 DC Fine Silica (Dow Corning Co.) Fransol (Fransil)

Further, a treated silica fine powder obtained by subjecting a silica fine powder produced by vapor-phase oxidation of the silicon halide compound to a hydrophobic treatment is more preferable. It is particularly preferable that the treated silica fine powder is obtained by treating the silica fine powder such that the degree of hydrophobicity measured by a methanol titration test shows a value in the range of 30 to 80.

The method for imparting hydrophobicity is provided by chemically treating with an organic silicon compound or the like which reacts with or physically adsorbs silica fine powder. As a preferred method, silica fine powder produced by vapor phase oxidation of a silicon halide is treated with an organosilicon compound.

Examples of the organosilicon compound include hexamethyldisilazane, trimethylsilane, trimethylchlorosilane, trimethylethoxysilane, dimethyldichlorosilane, methyltrichlorosilane, allyldimethylchlorosilane, allylphenyldichlorosilane, benzyldimethylchlorosilane, Bromomethyldimethylchlorosilane,
α-chloroethyltrichlorosilane, ρ-chloroethyltrichlorosilane, chloromethyldimethylchlorosilane, triorganosilylmercaptan, trimethylsilylmercaptan, triorganosilyl acrylate, vinyldimethylacetoxysilane, dimethylethoxysilane, dimethyldimethoxysilane, diphenyldiethoxysilane , Hexamethyldisiloxane, 1,3-divinyltetramethyldisiloxane, 1,3-diphenyltetramethyldisiloxane and 2 to 12 siloxane units per molecule, each having one to each of the terminal units. Examples include dimethylpolysiloxane containing a hydroxyl group bonded to Si. These are used alone or as a mixture of two or more.

Aminopropyltrimethoxysilane having a nitrogen atom, aminopropyltriethoxysilane, dimethylaminopropyltrimethoxysilane, diethylaminopropyltrimethoxysilane, dipropylaminopropyltrimethoxysilane, dibutylaminopropyltrimethoxysilane, monobutylamino Propyltrimethoxysilane, dioctylaminopropyldimethoxysilane, dibutylaminopropyldimethoxysilane, dibutylaminopropylmonomethoxysilane, dimethylaminophenyltriethoxysilane, trimethoxysilyl-γ
-Propylphenylamine, trimethoxysilyl-γ-
A silane coupling agent such as propylbenzylamine may be used alone or in combination. As a preferred silane coupling agent, hexamethyldisilazane (HMD)
S).

The preferred silicone oil used in the present invention has a viscosity at 25 ° C. of 0.5 to 10,000 centistokes, preferably 1 to 1,000 centistokes, more preferably 10 to 200 centistokes. Silicone oil,
Methylfell silicone oil, α-methylstyrene-modified silicone oil, chlorophenyl silicone oil, and fluorine-modified silicone oil are particularly preferred. Examples of the method of silicone oil treatment include a method in which silica fine powder treated with a silane coupling agent and silicone oil are directly mixed using a mixer such as a Henschel mixer; Or a method of dissolving or dispersing silicone oil in an appropriate solvent, adding silica fine powder, mixing and removing the solvent. The silicone oil-treated silica is more preferably heated to 200 ° C. or more (more preferably 250 ° C. or more) in an inert gas after the treatment of the silicone oil to stabilize the surface coat.

In the present invention, silica is previously added
It is preferable to use a method of treating with a silicone oil after treating with a coupling agent or a method of treating silica with a coupling agent and silicone oil simultaneously.

The fluidity improver has a specific surface area by nitrogen adsorption measured by the BET method of 30 m ² / g or more, preferably 5 m ² / g or more.
Those with 0 m ² / g or more give good results. It is preferable to use 0.01 to 8 parts by mass, preferably 0.1 to 4 parts by mass of the fluidity improver based on 100 parts by mass of the toner particles.

The toner of the present invention can be used as a two-component developer by mixing with a carrier. The current value of the carrier is preferably adjusted to 20 to 200 μA by adjusting the degree of unevenness on the carrier surface and the amount of resin to be coated.

As the resin for coating the carrier surface, styrene-acrylate copolymer, styrene-methacrylate copolymer, acrylate copolymer, methacrylate copolymer, silicone resin,
Fluorine-containing resin, polyamide resin, ionomer resin,
Polyphenylene sulfide resin or the like, or a mixture thereof can be used.

As the magnetic material of the carrier core, oxides such as ferrite, iron-rich ferrite, magnetite and γ-iron oxide, metals such as iron, cobalt and nickel, or alloys thereof can be used. The elements contained in these magnetic materials include iron, cobalt, nickel, aluminum, copper, lead, magnesium, tin,
Examples include zinc, antimony, beryllium, bismuth, cadmium, calcium, manganese, selenium, titanium, tungsten, and vanadium.

To prepare the toner of the present invention, first, a binder resin, a colorant and / or a magnetic substance, a charge control agent or other additives are sufficiently mixed by a mixer such as a Henschel mixer or a ball mill. The mixture is melted and kneaded using a hot kneader such as a kneader or an extruder to make the resins compatible with each other. Toner can be obtained. Further, the fluidity improver and / or other external additives are sufficiently mixed with the toner by a mixer such as a Henschel mixer to obtain a toner having the fluidity improver and / or other external additives on the surface of the toner particles. Can be.

The following are generally used as toner production apparatuses, but are not limited thereto.

(1) Example of pulverizing apparatus for toner production Apparatus name Manufacturer Maker Counter Jet Mill Hosokawa Micron Micron Jet Hosokawa Micron IDS Mill Nippon Pneumatic Industries PJM Jet Pulverizer Nippon Pneumatic Industries Cross Jet Mill Kurimoto Iron Works Ulmax Nisso Engineering ・ SK Jet O Mill Seishin ・ Kryptron Kawasaki Heavy Industries ・ Turbomill Turbo Industries ・ Inomaiza Hosokawa Micron (2) Example of mixing equipment for toner production Equipment name Manufacturer Henschel Mixer Mitsui Mining ・ Super Mixer Kawata ・ Revocorn Okawara Works ・ Nauta Mixer Hosokawa Micron ・ Spiral Pin Mixer Taiheiyo Kiko ・ Redige Mixer Matsubo ・ Turbulizer Hosokawa Micron ・ Sa Black Mix Hosokawa Micron (3) for producing a toner classifier example device name manufacturer & classy Le Seishin Enterprise Micron crush fire Seishin Enterprise-spare Dick crush fire Seishin Enterprise Turbo crush Fire Nisshin Engineering micron separator by Hosokawa Micron-Turboplex (ATP ) Hosokawa Micron-TSP Separator Hosokawa Micron-Elbow Jet Nippon Steel Mining-Dispersion Separator-Nippon Pneumatic-YM Micro Cut Yasukawa Shoji (4) Example of kneading equipment for toner production Equipment name Manufacturer -KRC Kneader Kurimoto Iron Works-Bus Co. Kneader Buss ・ TEM extruder TOSHIBA MACHINE ・ TEX twin screw kneader Nippon Steel Works ・ PCM kneader Ikekai Iron Works ・ Three roll mill Inoue Manufacturing mixing roll mill Inoue Manufacturing & kneader Inoue Seisakusho, KNEADEX Mitsui Mining & MS-type pressure kneader Moriyama Seisakusho-Nida Ruder Moriyama Seisakusho, a Banbury mixer by Kobe Steel (5) Toner manufacturing sieving apparatus example device name manufacturer Ultra Sonic Koei Sangyo ・ Resonasive Tokuju Kogyo ・ Vibra Sonic System Dalton ・ Soniclean Shinto Kogyo ・ Gyro Shifter Tokuju Kogyo ・ Many manufacturers of circular vibrating sieves ・ Turbo Screener Turbo Kogyo ・ Micro Shifter Makino Sangyo

The toner of the present invention preferably has a weight average particle diameter of 3 to 9.5 μm in view of image density and resolution.

Next, a preferred fixing device used in the image forming method of the present invention will be described. However, the materials, shapes, three-dimensional configurations, and the like described in the embodiments are not intended to limit the scope of the present invention only to them unless otherwise specified.

FIG. 1 is a schematic configuration diagram of an example of an image forming apparatus according to an embodiment of the present invention.

The fixing roller 1 which is a rotary heating member is, for example, formed on an iron core metal cylinder 11 (heat generating layer) having an outer diameter of 40 mm and a thickness of 0.7 mm by, for example, PTFE of 10 to 50 μm in order to enhance surface releasability. Alternatively, it is configured by providing a release layer 12 having a PFA of 10 to 50 μm.

The pressure roller 2, which is a rotary pressure member, comprises a hollow cored metal 14 and an elastic layer 15, which is a heat-resistant rubber layer having a surface release property, formed on the outer peripheral surface thereof.

Bearings are formed at both ends of the pressure roller 2, and are rotatably attached to a fixing unit frame (not shown).

The fixing roller 1 and the pressure roller 2 are rotatably supported so that only the fixing roller 1 is driven.

The pressure roller 2 is in pressure contact with the surface of the fixing roller 1 and is arranged so as to be driven to rotate by frictional force at a pressure contact portion (nip portion).

The pressure roller 2 is pressed in the rotation axis direction of the fixing roller 1 by a mechanism (not shown) using, for example, a spring.

The pressure roller 2 is, for example, 294 N (30 k
g weight), and the width (nip portion; N in FIG. 3) of the press contact portion in that case is configured to be about 6 mm.

Of course, the nip width (N) may be changed by changing the load in consideration of the use conditions and the like.

The temperature sensor 6 is arranged so as to be in contact with the surface of the fixing roller 1. The power supply to the exciting coil 3 as the exciting means is increased or decreased based on the detection signal of the temperature sensor 6, so that the temperature of the fixing roller 1 is increased. Is automatically controlled so that the surface temperature becomes a predetermined constant temperature.

The transport guide 7 is arranged at a position where the transfer material 16 transported while carrying the unfixed toner image 8 is guided to a pressure contact portion (nip portion) between the fixing roller 1 and the pressure roller 2. .

The separation claw 10 is disposed in contact with or close to the surface of the fixing roller 1 to prevent the transfer material 16 on which the fixed image 13 is formed from being wound around the fixing roller 1.

The exciting coil 3 has a structure in which a conductive wire is wound around a central protruding portion of a magnetic core 4 (hereinafter, referred to as a core) having a T-shaped cross section so as to extend along the inner peripheral surface of the fixing roller.
It is provided outside the holder 5 made of a heat-resistant resin such as PS, PEEK, and phenol resin.

The excitation coil 3 has a frequency of 10 to 100 kHz.
Is applied.

The magnetic field induced by the alternating current is guided to the core 4 as a magnetic field interrupting means having a high magnetic permeability to generate a magnetic flux and an eddy current on the inner surface of the fixing roller 1 as the heat generating means. Joule heat is generated by the specific resistance of 1.

In order to increase the heat generation, the number of turns of the exciting coil 3 may be increased, the core 4 may be made of ferrite or permalloy having a high magnetic permeability and a low residual magnetic flux density, or the frequency of the alternating current may be increased. .

The core 4 has a T-shaped cross section extending in the rotation axis direction of the fixing roller 1.
The magnetic field generated by the excitation is cut off, and the magnetic field is concentrated toward the heating unit.

When the surface temperature of the fixing roller 1 is adjusted to a predetermined temperature optimal for fixing, for example, 190 ° C. with the above-described configuration, about 200 W of electric power needs to be supplied to the exciting coil. At that time, the temperature of the exciting coil becomes about 210 ° C., and the temperature of the magnetic core becomes about 200 ° C.

When a large amount of toner is continuously fixed at a speed of about 30 sheets per minute, a power of about 450 W is required to be supplied to the exciting coil.
0 ° C. and the temperature of the magnetic core becomes about 220 ° C. Therefore, the Curie temperature of the magnetic core must be 220 ° C. or higher in consideration of the case where a large amount of toner is fixed continuously. if,
If the temperature of the magnetic core exceeds its Curie temperature (the temperature at which transition from ferromagnetism to paramagnetism occurs), the power-to-heat conversion efficiency will drop extremely at the extremes.

In the above description, the case where the fixing roller is used as the heating member has been described. However, it is of course possible to adopt a configuration made of a thin metal film instead of the fixing roller.

The methods for measuring the physical properties of the toner and raw materials of the present invention are described below. The embodiments described below are also based on this method.

(1) Measurement of Tetrahydrofuran (THF) -Insoluble Content A 0.5-1.0 g sample was weighed (W ₁ g), and a cylindrical filter paper (for example, No. 86R manufactured by Toyo Roshi Kaisha, Ltd.) was put into the soxhlet extractor. After extracting with 200 ml of THF as a solvent for 10 hours, evaporating the soluble component solution extracted with the solvent, vacuum drying at 100 ° C. for several hours, and weighing the amount of the THF soluble component (W ₂ g). The weight of the residual combustion ash in the toner is determined (W ₃ g). The residual ash from combustion is determined by the following procedure. About 2.0 g of a sample is placed in a 30-ml magnetic crucible precisely weighed in advance and precisely weighed, and the weight (Wa) g of the sample is precisely weighed. Put the crucible in an electric furnace, about 900
The mixture was heated at 3 ° C. for 3 hours, allowed to cool in an electric furnace, allowed to cool in a desiccator at room temperature for 1 hour or more, and then accurately weighed the crucible mass. From this, the residual combustion ash (Wb) g is determined.

(Wb / wa) × 100 = residual ash content (% by mass)

From this content, the weight of the residual combustion ash in the sample is determined. The THF-insoluble content is obtained from the following equation.

[0098]

(Equation 1)

In the case of a binder resin, the THF-insoluble content may be determined from the following equation.

[0100]

(Equation 2)

FIG. 2 shows an example of a Soxhlet extraction apparatus. The THF 22 contained in the container 21 is heated and vaporized by the heater 23, and the vaporized THF is led to the cooler 25 through the pipe 24. The cooler 25 is constantly cooled by cooling water 26. The THF cooled and liquefied by the cooler 25 accumulates in the storage unit 28 having the cylindrical filter paper 27, and when the liquid level of THF becomes higher than the middle pipe 29, the THF is discharged from the storage unit to the container 21. The toner contained in the cylindrical filter paper is extracted by the circulating THF.

(2) Measurement of Acid Value The acid value is measured according to the measurement method described in JIS K0070-1992. Measuring device: Automatic potentiometric titrator AT-400 (manufactured by Kyoto Electronics Co., Ltd.) Device configuration: 120 ml of toluene and 30 ml of ethanol
Use a mixed solvent of Measurement temperature: 25 ° C. Sample preparation: 0.5 g of a sample is added to 120 ml of toluene and dissolved by stirring at room temperature (about 25 ° C.) for about 10 hours. Further, 30 ml of ethanol is added to make a sample solution.

(3) Measurement of Melt Viscosity of Toner Measuring apparatus: Flow tester CFT-500 (manufactured by Shimadzu Corporation) Measurement conditions: Die diameter; 1 mm Die length: 1 mm Load: 10 kg Heating rate: 6 ° C./min Sample preparation : About 2 g of toner on a pellet having a diameter of 1 cm is used.

[0104]

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these examples.

(Production Example of Binder Resin) A polyester monomer shown in Table 1 was charged into a four-necked flask together with an esterification catalyst, and a pressure reducing device, a water separating device, a nitrogen gas introducing device,
The reaction was carried out at a temperature of 230 ° C. in a nitrogen atmosphere equipped with a temperature measuring device and a stirring device. After the reaction was completed, the resin was taken out of the vessel, cooled and pulverized to obtain a binder resin (A) having a softening point of 128 ° C. ASTM E28-67 for measurement of softening point
Performed according to. The acid value of this resin is 24 mgKOH /
g.

The binder resins (B) to (G) having different softening points and acid values were obtained by changing the types and composition ratios of the monomers as shown in Table 1 below.

<Example 1> Binder resin (A): 100 parts by mass Metal compound represented by the following formula (1): 2 parts by mass

[0108]

Embedded image Magnetic iron oxide: 90 parts by mass (average particle size: 0.2 μm, Hc: 9.5 kA / m, σs: 82 Am ² / kg, σr: 10 Am ² / kg) Polypropylene (melting point: 138 ° C.): 3 parts by mass Part The above mixture was melt-kneaded with a biaxial extruder heated to 130 ° C., and the cooled mixture was roughly pulverized with a hammer mill. This coarsely pulverized product is finely pulverized by a jet mill, and the obtained finely pulverized product is classified by an air classifier to obtain a weight average diameter of 8.
A magnetic toner of 0 μm was obtained.

THF of the polyester resin in the toner
The insoluble content is 42% by mass.
The rate of change of the melt viscosity at 0 ° C. was 5.6 × 10.

To 100 parts by mass of the magnetic toner, 1.0 part by mass of hydrophobic dry silica (BET 180 m ² / g) was externally added using a Henschel mixer.

Using this magnetic toner, the fixing device of the Canon copying machine GP405 was changed to the fixing device shown in FIG.
The following evaluation was performed. At this time, the thickness of the heating layer of the rotary heating member was 5 mm, the nip width was 7.5 mm, and the linear pressure was 15,000.
N / m and the fixing speed were adjusted to 150 mm / s.

(Fixing property) In a low temperature environment (15 ° C.)
The fixing temperature of the examination machine was changed, and the minimum fixing temperature was compared. The minimum fixing temperature is 4900 N / m ² (5
A fixed image was rubbed with a soft thin paper by applying a load of 0 g / cm ² ), and the temperature was set at a temperature at which the reduction rate of the image density before and after the rubbing became 20% or less.

(Offset) In a normal temperature environment (23 ° C.), 100 small size papers (B5) are continuously passed. At this time, the fixing roller has a temperature difference of about 50 ° C. between the paper passing portion and the non-paper passing portion. Thereafter, using a black belt with a width of 2 cm drawn on the leading end of the A3 size paper as a document, ten continuous copy images are taken on the A3 size paper, and the toner of the non-paper passing portion is offset on the fixing paper. Check that The evaluation criteria were determined as follows. Rank 1: No offset has occurred. Rank 2: A slight offset occurs only in the first sheet, but does not occur in the second and subsequent sheets. Rank 3: An offset occurs up to the fifth sheet, but does not occur thereafter. Rank 4: Offset continues up to the 10th sheet. Rank 5: The first sheet is wrapped around the roller, causing a paper jam.

(Fixing roller contamination) In a normal temperature environment, 1
A durability test was carried out on 100,000 sheets, and the degree of contamination of the fixing roller and the pressure roller after the durability test was evaluated according to the following criteria. Rank 1: Both the fixing roller and the pressure roller are not stained at all. Rank 2: Adhesion of toner is observed on a part of the fixing roller or the pressure roller, but is not shown in the image. Rank 3: Toner is slightly adhered to both the fixing roller and the pressure roller, but is not shown in the image. Rank 4: toner considerably adheres to the fixing roller and / or the pressure roller and appears on the image. Rank 5: A large amount of toner adheres to both the fixing roller and the pressure roller, and the fixing paper is wound.

As a result of evaluation, as shown in Table 3, good results were obtained for this toner.

<Examples 2 to 5> Toners were prepared by changing the amounts of the binder resin and the metal compound as shown in Table 2, and toners having physical properties shown in Table 2 were obtained. These were evaluated in the same manner as in Example 1, and as a result, good results as shown in Table 3 were obtained.

<Example 6> In Example 1, a toner having physical properties shown in Table 2 was obtained by using a metal compound represented by the following formula (2) as a metal compound when preparing a toner. This toner was evaluated in the same manner as in Example 1, and as a result,
Good results as shown in Table 3 were obtained.

[0118]

Embedded image

Comparative Example 1 A toner was prepared in the same manner as in Example 1 except that no metal compound was contained, and a toner having the physical properties shown in Table 2 was obtained. These were evaluated in the same manner as in Example 1, and as a result, the results shown in Table 3 were obtained.

<Comparative Examples 2-3> Toners were prepared by changing the binder resin as shown in Table 2 and changing the metal compounds to those represented by the following formula (3), and the physical properties shown in Table 2 Was obtained. These were evaluated in the same manner as in Example 1, and as a result, the results shown in Table 3 were obtained.

[0121]

Embedded image

Comparative Example 4 A toner was prepared in the same manner as in Example 4 except that the metal compound represented by the formula (3) was changed to 11 parts by mass to obtain a toner having the physical properties shown in Table 2. These were evaluated in the same manner as in Example 1, and as a result, Table 3
The result as shown in FIG.

[0123]

[Table 1]

[0124]

[Table 2]

[0125]

[Table 3]

[0126]

According to the present invention, by combining the image forming method having the above-described structure with the toner, it has excellent low-temperature fixability and high-temperature offset resistance from low to high speeds, and has low power consumption. It is possible to provide a toner and an image forming method that can achieve compatibility with quick printing.

[Brief description of the drawings]

FIG. 1 is a schematic configuration sectional view of a fixing device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a Soxhlet extraction device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary heating member (fixing roller) 2 Rotating pressure member (pressure roller) 3 Excitation coil (magnetic field generating means) 4 Core 5 Holder 6 Temperature sensor 7 Transport guide 8 Toner image 10 Separation claw 11 Heat generation layer 12 Release layer 13 Fixed image 14 Hollow core 15 Elastic layer 16 Transfer material (recording material)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G03G 15/20 101 G03G 9/08 361 F-term (Reference) 2H005 AA01 AA02 AA06 AA08 CA08 CA25 CB03 CB08 CB13 DA01 EA03 EA10 2H033 AA09 AA30 AA32 BA25 BA58 BB12 BB19 BB33 BB34 BE03 BE06 CA36 CA40

Claims (20)

[Claims] 1. A magnetic field generating means, (2) a rotary heating member containing at least a heating layer and a release layer heated by electromagnetic induction, and (3) a nip with the rotary heating member. A heating and pressurizing means having at least a rotating and pressing member, and heating and fixing the toner image on the recording material while pressing the rotating and heating member via the recording material with the rotating and pressing member. A toner applied to an image forming method for forming a fixed image, wherein the toner is a toner formed of a composition containing at least a binder resin and a colorant, wherein the binder resin of the toner composition is Tetrahydrofuran (T
HF) a polyester resin containing 10% by mass to 60% by mass of an insoluble content and having an acid value of 1 mgKOH / g to 100 mgKOH / g, wherein the toner has a metal compound, and the melt viscosity of the toner at 100 ° C. (V ₁₀₀₎
Is 5 × 10 ⁴ Pa · s to 1 × 10 ⁷ Pa · s, and the change rate V of the melt viscosity of the toner from 100 ° C. to 140 ° C.
₁₀₀ / _V140 is 10 ³ or less. 2. The toner according to claim 1, wherein the binder resin is a polyester resin containing from 20% by mass to 50% by mass of a THF-insoluble component. 3. The binder resin having an acid value of 5 mg KOH / g.
The toner according to claim 1, wherein the toner is a polyester resin having a weight of from about 80 mgKOH / g to about 80 mgKOH / g. 4. The toner according to claim 1, wherein the toner is a binder resin.
4. The toner according to claim 1, wherein the toner is contained in an amount of 0.1 to 10 parts by mass per part by mass. 5. The method according to claim 4, wherein the metal compound is an aromatic hydroxycarboxylic acid metal complex or salt.
The toner according to 1. 6. The toner according to claim 1, wherein the toner has a melt viscosity at 100 ° C. of 5 × 10 ⁴ Pa · s to 5 × 10 ⁶ Pa · s. 7. The binder resin according to claim 1, wherein the binder resin is a polyester resin containing a trivalent or higher polycarboxylic acid or an anhydride thereof and / or a trivalent or higher polyhydric alcohol. The toner according to any one of the above. 8. The toner according to claim 1, wherein the toner contains a magnetic powder as the colorant. 9. The toner according to claim 1, wherein the toner is externally added with a hydrophobic fine inorganic powder. 10. The heating layer of the rotary heating member has a thickness of 0.1 mm.
01 to 20 mm, a nip width formed by the rotary heating member and the rotary pressing member is 1 to 20 mm, and a linear pressure of 10 ³ to 10 ^{5 is applied} to the rotary heating member via a recording material.
Fixing speed 1 while pressing the rotating pressure member at N / m
The toner according to any one of claims 1 to 9, wherein the toner image is used in an image forming method for fixing a toner image under heat and pressure under a condition of 0 to 500 mm / sec. 11. An image forming method for forming a fixed image on a recording material by heating and fixing a toner image on a recording material by heating and pressing means, wherein the toner forming the toner image is at least a binder resin. And a colorant, and the binder resin of the toner composition is tetrahydrofuran (T
HF) a polyester resin containing 10% by mass to 60% by mass of an insoluble content and having an acid value of 1 mgKOH / g to 100 mgKOH / g, wherein the toner has a metal compound, and the melt viscosity of the toner at 100 ° C. (V ₁₀₀₎
Is 5 × 10 ⁴ Pa · s to 1 × 10 ⁷ Pa · s, and the change rate V of the melt viscosity of the toner from 100 ° C. to 140 ° C.
₁₀₀ / V ₁₄₀ is 10 ³ or less, the heating means includes (1) a magnetic field generating means, (2) a rotary heating member containing at least a heating layer and a release layer heated by electromagnetic induction, and (3) Using a heating / pressurizing means having at least the rotating heating member and a rotating pressing member forming a nip, the rotating pressing member is pressed onto the recording material while pressing the rotating heating member via the recording material. An image forming method for forming a fixed image on a recording material by heating and fixing the toner image. 12. The image forming method according to claim 11, wherein the binder resin is a polyester resin containing 20% by mass to 50% by mass of a THF-insoluble component. 13. The binder resin having an acid value of 5 mgKOH /
The image forming method according to claim 11, wherein the resin is a polyester resin having a weight of g to 80 mgKOH / g. 14. The toner according to claim 1, wherein the toner is a binder resin.
14. The image forming method according to claim 11, wherein the content is 0.1 to 10 parts by mass per 0 parts by mass. 15. The image forming method according to claim 14, wherein the metal compound is a metal complex or salt of an aromatic hydroxycarboxylic acid. 16. The image forming method according to claim 11, wherein the toner has a melt viscosity at 100 ° C. of 5 × 10 ⁴ Pa · s to 5 × 10 ⁶ Pa · s. . 17. The method according to claim 16, wherein the binder resin is a polyester resin containing a trivalent or higher polycarboxylic acid or an anhydride thereof and / or a trivalent or higher polyhydric alcohol. Image forming method. 18. The image forming method according to claim 11, wherein the toner contains a magnetic powder as the colorant. 19. The image forming method according to claim 11, wherein the toner is externally added with a hydrophobic fine inorganic powder. 20. The heating layer of the rotary heating member has a thickness of 0.
01 to 20 mm, a nip width formed by the rotary heating member and the rotary pressing member is 1 to 20 mm, and a linear pressure of 10 ³ to 10 ^{5 is applied} to the rotary heating member via a recording material.
Fixing speed 1 while pressing the rotating pressure member at N / m
20. The image forming method according to claim 11, wherein the toner image is heated and pressed under a condition of 0 to 500 mm / sec.