JPH08328296A - Toner for forming full-color image - Google Patents

Abstract

PURPOSE: To obtain a toner excellent in color reproducibility without deteriorating low-temp. fixability, not. causing filming on a photoreceptor and excellent in durability. CONSTITUTION: This toner contains at least a bonding resin, a colorant and a releasing agent and has 40-80 deg.C glass transition temp. (Tg). The peak (Mp) of the mol. wt. distribution of the toluene-soluble component of this toner is in the mol. wt. region of 10,000-60,000 and conditions represented by 210 <=4×Tg+Mp×10<-3> <=330 are satisfied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-color image forming toner for developing an electrostatic latent image.

[0002]

2. Description of the Related Art Conventionally, many methods are known as an electrophotographic method as described in US Pat. No. 2,297,691, but generally, a photoconductor made of a photoconductive substance is used. Then, an electric latent image is formed on the photoconductor by various means, and then the latent image is developed with toner to form a visible image, and a toner image is formed on a transfer material such as paper as necessary. After the transfer, the toner image is fixed on the transfer material by heat, pressure or the like to obtain a copied image. Further, various methods have been conventionally proposed as a method of developing with toner or a method of fixing a toner image.

Conventionally, for toners used for these purposes, a coloring agent composed of a dye and a pigment is generally melt-mixed in a thermoplastic resin, dispersed uniformly, and then finely pulverized by a fine pulverizer, and the finely pulverized product is classified. To produce a toner having a desired particle size.

While this method of manufacture can produce fairly good toners, it does have certain limitations, ie, the choice of toner materials. For example, the resin colorant dispersion must be sufficiently brittle to be comminuted in an economically feasible manufacturing apparatus. However, if the resin colorant dispersion is made brittle in order to satisfy these requirements, when the dispersion is actually finely pulverized at a high speed, the particle size range of the formed particles tends to be wide, and in particular, a relatively large proportion. There is a problem that the fine particles of are included in this. Further, the toner obtained from such a brittle material is easily subjected to further fine pulverization or pulverization when it is used for development such as a copying machine. Further, in this method, it is difficult to completely uniformly disperse solid fine particles such as a colorant in the resin, and depending on the degree of the dispersion, fogging during image formation, decrease in image density and color mixture・ Care must be taken to disperse the colorant as it will cause poor transparency. In addition, the exposure of the colorant on the fracture surface of the crushed particles may cause fluctuations in the developing characteristics.

On the other hand, in order to overcome the problems of the toner by the pulverization method, Japanese Patent Publication No. 36-10231 and 4
Various polymerization toners and methods for producing the same have been proposed, including suspension polymerization toners described in JP-A-3-10799 and JP-A-51-14895. For example, in the suspension polymerization toner, a polymerizable monomer, a colorant, a polymerization initiator,
Further, if necessary, a crosslinking agent, a charge control agent, and other additives are uniformly dissolved or dispersed to form a monomer composition, and then the monomer composition is mixed with a continuous phase containing a dispersion stabilizer,
For example, it is dispersed in an aqueous phase using a suitable stirrer, and at the same time, a polymerization reaction is performed to obtain toner particles having a desired particle size.

Since this method does not include a crushing step at all, the toner does not need to be brittle, a soft material can be used, and the colorant is not exposed on the surface of the particles. There is an advantage that a toner having excellent triboelectric chargeability can be obtained. Further, since the obtained toner has a relatively sharp particle size distribution, the toner can be obtained in a high yield even if the classification step is omitted or classified.

However, recent copying machines and printers are required to be small, lightweight and highly reliable, and the requirements for toner performance are becoming severe. For example, there is a demand for a toner having excellent durability that is less likely to cause filming on a photoreceptor and contamination of the surface of a toner carrier such as a carrier or a sleeve without impairing low-temperature fixability. Japanese Patent Laid-Open Nos. 59-21845 and 5
9-218460, JP-A-59-219755, JP-A-60-28665, and JP-A-60-3.
1147, JP-A-60-45260, and JP-A-3-197971 specify toner insolubles in solvents such as THF and toluene, and propose toners having excellent fixing properties. From the viewpoint of achieving both low-temperature fixability and durability, and from the viewpoint of durability, the molecular weight of the soluble component is further specified in JP-A-60-31147 and JP-A-3-197971. At present, further improvement is required. Further, JP-A-3-251853 proposes a toner in which a minimum peak molecular weight and a maximum peak molecular weight of a molecular weight distribution are specified, but it is said that low temperature fixing property or improvement of color reproducibility when used for a full color toner. From the point of view, further improvement is required at present.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide excellent color reproducibility without damaging the low-temperature fixing property and to form a film on a photoconductor or the surface of a toner carrier such as a carrier or a sleeve. Another object of the present invention is to provide a full-color image forming toner that is resistant to contamination and has excellent durability.

[0009]

The above-mentioned object is to provide a toner having at least a binder resin, a colorant, and a releasing agent, and the glass transition temperature (Tg) of the toner is 40 to 8.
It is 0 ° C., the peak (Mp) of the molecular weight distribution of the toluene-soluble component of the toner is in the range of molecular weight 10,000 to 60,000, and the following condition 210 ≦ 4 × Tg + Mp × 10 ⁻³ ≦ 330 is satisfied. This is achieved by a full-color image forming toner characterized by the above.

Hereinafter, the present invention will be described in detail.

Generally, in order to obtain a toner having excellent durability, which is unlikely to be filmed on the photoconductor or polluted on the surface of a toner carrier such as a carrier or a sleeve, a crosslinked binder resin or a high molecular weight component of the toner is used. Is increased or Tg of the toner is increased, but simply increasing the crosslinking component or the high molecular weight component or increasing Tg causes an increase in fixing temperature. In order to prevent this, at least one peak molecular weight Mp in the molecular weight distribution of the toluene-soluble component is in the range of 10,000 to 60,000, and 210 ≦ 4 × Tg + Mp × 10 ⁻³ ≦ between the toner Tg and the toner Tg. It was found that by satisfying 330, it is possible to impart durability to the toner without impairing the fixing property. This is the feature of the present invention.

If the above value is larger than 330, the fixing temperature rises and the color reproduction range becomes narrow when used for full-color toner, which is not preferable. On the other hand, when it is smaller than 210, the fixing property is improved, but durability or storability is deteriorated, or a problem such as curling during double-sided copying occurs.

Specifically, paraffin wax, polyolefin wax, Fischer-Tropish wax,
Amide wax, higher fatty acid, ester wax and their derivatives or their graft / block compounds can be used.

If the maximum peak is less than 40 ° C., the self-aggregating force of the low softening point substance becomes weak, and as a result, the high temperature offset resistance becomes weak, which is not preferable. On the other hand, the maximum peak is 1
If it exceeds 20 ° C, the fixing temperature becomes high, which is not preferable.

In measuring the temperature of the maximum peak value of the present invention,
For example, Perkin Elmer DSC-7 is used. The melting point of indium and zinc is used to correct the temperature of the device detection unit, and the heat of fusion of indium is used to correct the amount of heat. An aluminum pan was used as a sample and an empty pan was set as a control, and the temperature rising rate was 10 ° C./min. Was measured.

The low softening point substance is preferably encapsulated in the toner from the viewpoint of durability. As a specific method for encapsulating the low softening point substance, the polarity of the material in the aqueous medium is mainly determined. The toner having a so-called core / shell structure in which the low softening point substance is coated with the outer shell resin by setting the low softening point substance to be smaller than that of the polymer and further adding a small amount of a resin or monomer having a large polarity, Obtainable.

As a concrete method for confirming the core / shell structure, a cured product obtained by sufficiently dispersing the toner in an epoxy resin which is curable at room temperature and then curing it in an atmosphere at a temperature of 40 ° C. for 3 days is used. After dyeing with ruthenium oxide and optionally osmium tetroxide in combination, a flaky sample was cut out using a microtome equipped with diamond teeth, and the tomographic morphology of the toner was measured using a transmission electron microscope (TEM). In the present invention, it is preferable to use the ruthenium tetraoxide dyeing method in order to make a contrast between materials by utilizing a slight difference in crystallinity between the low softening point substance used and the resin constituting the outer shell. .

The particle size distribution control and particle size control of the toner are carried out by changing the kind and addition amount of the sparingly water-soluble inorganic salt or dispersant which acts as a protective colloid, and mechanical device conditions such as rotor peripheral speed, number of passes, The toner of the present invention can be obtained by controlling the stirring conditions such as the shape of stirring blades, the shape of the container, or the solid content concentration in the aqueous solution.

The polymerizable monomer used in the present invention includes styrene, o- (m-, p-)-methylstyrene,
styrene-based monomers such as m (p-)-ethylstyrene;
Methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, octyl (meth) acrylate, dodecyl (meth) acrylate, stearyl (meth) acrylate, ( (Meth) acrylic acid ester-based monomers such as behenyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate; butadiene, isoprene, cyclohexene, An ene-based monomer such as (meth) acrylonitrile or acrylic acid amide is preferably used. These may be used alone or generally in the publication Polymer Handbook Second Edition III-P 139-192 (John.
A monomer is appropriately mixed and used so that the theoretical glass transition temperature (Tg) described in Wiley & Sons) is 40 to 80 ° C.

The molecular weight distribution of the toluene-soluble component in the toner of the present invention is measured by the following method.

The toner is previously extracted with a toluene solvent for 20 hours using a Soxhlet extractor, and the extraction residue is sufficiently dried, but the weight ratio to the toner is A.

On the other hand, the extract was distilled off toluene with a rotary evaporator, solubilized in THF (tetrahydrofuran), and filtered through a solvent-resistant membrane filter having a pore size of 0.3 μm to obtain a sample of 150C manufactured by Waters. Used, the column configuration is Showa Denko A-80
1,802,803,804,805,806,807
And the molecular weight distribution can be measured using a standard polystyrene resin calibration curve.

In the present invention, when a toner having a core / shell structure is produced, it is particularly preferable to add a polar resin. As the polar resin used in the present invention, a copolymer of styrene and (meth) acrylic acid, a maleic acid copolymer, a saturated polyester resin, and an epoxy resin are preferably used. It is particularly preferable that the polar resin does not contain an unsaturated group capable of reacting with the shell resin or the monomer in the molecule.

Further, in the present invention, an outermost shell resin layer may be further provided on the surface of the toner.

The glass transition temperature of the outermost shell resin layer is designed to be equal to or higher than the glass transition temperature of the outer shell resin layer in order to further improve the blocking resistance, and is cross-linked so as not to impair the fixability. It is preferable. Further, it is preferable that the outermost shell resin layer contains a polar resin and a charge control agent in order to improve the charging property.

The method for providing the outermost shell layer is not particularly limited, but the following method may be mentioned, for example.

In the latter half of the polymerization reaction or after the completion of the polymerization reaction, a polar resin, a charge control agent, a cross-linking agent, etc. are dissolved and dispersed in the reaction system, if necessary, and the dispersed monomer is added to the polymerized particles to be adsorbed to the polymerized particles. A method of carrying out polymerization.

If necessary, a polar resin, a charge control agent,
A method in which emulsion-polymerized particles or soap-free polymerized particles composed of a monomer containing a crosslinking agent or the like are added to the reaction system, and the particles are aggregated on the surface of the polymerized particles and fixed by heat or the like as necessary.

If necessary, a polar resin, a charge control agent,
A method of mechanically adhering emulsion-polymerized particles or soap-free polymerized particles composed of a monomer containing a cross-linking agent and the like to toner particle surfaces in a dry manner.

As the colorant used in the color toner of the present invention, carbon black, a magnetic substance, and a yellow / magenta / cyan colorant shown below which are toned in black are used.

As the yellow colorant, condensed azo compounds, isoindolinone compounds, anthraquinone compounds,
Compounds represented by azo metal complexes, methine compounds and allylamide compounds are used. Specifically, C.I. I. Pigment Yellow 12, 13, 14, 15, 17, 6
2, 74, 83, 93, 94, 95, 109, 110,
111, 128, 129, 147, 168, 180 etc. are used suitably.

As the magenta colorant, condensed azo compounds, diketopyrrolopyrrole compounds, anthraquinones, quinacridone compounds, basic dye lake compounds, naphthol compounds, benzimidazolone compounds, thioindigo compounds, and perylene compounds are used. Specifically, C.I.
I. Pigment Red 2, 3, 5, 6, 7, 23, 4
8: 2, 48: 3, 48: 4, 57: 1, 81: 1, 1
22, 144, 146, 166, 169, 177, 18
4, 185, 202, 206, 220, 221, 254
Is particularly preferable.

As the cyan colorant, a copper phthalocyanine compound and its derivative, an anthraquinone compound, a basic dye lake compound and the like can be used. Specifically, C.I. I.
Pigment Blue 1, 7, 15, 15: 1, 15: 2,
15: 3, 15: 4, 60, 62, 66 and the like can be used particularly preferably.

These colorants may be used alone or in combination, and may be used in the form of solid solution. In the case of a color toner, the colorant of the present invention is selected from the viewpoints of hue angle, saturation, brightness, weather resistance, OHP transparency, and dispersibility in the toner. The amount of the colorant added is 1 with respect to 100 parts by weight of the resin.
It is used by adding ~ 20 parts by weight. When a magnetic material is used as the black colorant, unlike other colorants, it is used by adding 40 to 150 parts by weight to 100 parts by weight of the resin and is not included in the toluene insoluble matter of the present invention. .

The charge control agent used in the present invention includes:
Although known compounds can be used, in the case of color toner, a charge control agent which is colorless and has a high charging speed of the toner and which can stably maintain a constant charge amount is particularly preferable. Furthermore,
In the case of a toner obtained by a polymerization method, a charge control agent having no polymerization inhibitory property and having no solubilized product in an aqueous system is particularly preferable. As a specific compound, salicylic acid as a negative type,
Metal compounds of naphthoic acid, dicarboxylic acid, sulfonic acid, polymer type compounds having carboxylic acid in the side chain, boron compounds, urea compounds, silicon compounds, currys arenes, etc. can be used. Polymeric compounds having the quaternary ammonium salt in the side chain, guanidine compounds, imidazole compounds and the like are preferably used.

The charge control agent is preferably 0.5 to 10 parts by weight with respect to 100 parts by weight of the resin. However, the addition of the charge control agent is not essential in the present invention, and when the two-component developing method is used, triboelectric charging with the carrier is utilized and even when the non-magnetic one-component blade coating developing method is used. By positively utilizing the triboelectrification with the blade member or the sleeve member, it is not always necessary to include the charge control agent in the toner.

As the polymerization initiator used in the present invention, for example, 2,2'-azobis- (2,4-dimethylvaleronitrile), 2,2'-azobisisobutyronitrile,
1,1'-azobis (cyclohexane-1-carbonitrile), 2,2'-azobis-4-methoxy-2,4-
Azo-based polymerization initiators such as dimethyl valeronitrile and azobisisobutyronitrile; benzoyl peroxide, methyl ethyl ketone peroxide, diisopropyl peroxycarbonate, cumene hydroperoxide, 2,4-
Peroxide type polymerization initiators such as dichlorobenzoyl peroxide and lauroyl peroxide are used. The amount of the polymerization initiator added varies depending on the desired degree of polymerization, but it is generally used in an amount of 0.5 to 20% by weight based on the monomer. Although the kind of the initiator varies slightly depending on the polymerization method, it may be used alone or in combination with reference to the 10-hour half-life temperature.

In order to control the molecular weight distribution of the present invention, it is possible to further add and use a known crosslinking agent, chain transfer agent, polymerization inhibitor or the like.

When suspension polymerization is used in the toner production method of the present invention, the dispersant used is, for example, an inorganic oxide such as tricalcium phosphate, magnesium phosphate, aluminum phosphate, zinc phosphate, calcium carbonate. , Magnesium carbonate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, calcium metasilicate, calcium sulfate, barium sulfate, bentonite, silica, alumina, magnetic material, ferrite and the like.
As the organic compound, for example, polyvinyl alcohol, gelatin, methyl cellulose, methyl hydroxypropyl cellulose, ethyl cellulose, sodium salt of carboxymethyl cellulose, starch and the like are used after being dispersed in the aqueous phase. It is preferable to use 0.2 to 10.0 parts by weight of these dispersants with respect to 100 parts by weight of the polymerizable monomer.

As these dispersants, commercially available ones may be used as they are, but in order to obtain dispersed particles having a fine and uniform particle size, the inorganic compound should be formed in a dispersion medium under high speed stirring. You can also For example, in the case of tricalcium phosphate, a dispersant suitable for the suspension polymerization method can be obtained by mixing an aqueous sodium phosphate solution and an aqueous calcium chloride solution under high speed stirring. Further, 0.001 to 0.1 part by mass of a surfactant may be used in combination for making these dispersants finer. Specifically, commercially available nonionic, anionic, and cationic surfactants can be used. For example, sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium pentadecyl sulfate, sodium octyl sulfate,
Sodium oleate, sodium laurate, potassium stearate, calcium oleate and the like are preferably used.

The method for producing the toner of the present invention includes:
Resin, mold release agent consisting of low softening point material, colorant, charge control agent, etc. are evenly dispersed using a pressure kneader, extruder or media disperser, and then mechanically or in a jet stream collide with the target. There is a method of producing a toner by a so-called pulverization method in which a toner is finely pulverized to a desired toner particle size, and then a classification process is further performed to sharpen a particle size distribution to obtain a toner.

As a method for producing a polymerized toner, a releasing agent made of a low-softening substance, a colorant, a charge control agent, a polymerization initiator and other additives are added to the monomer, and a homogenizer / ultrasonic disperser is used. The monomer composition uniformly dissolved or dispersed by the above method is dispersed in an aqueous phase containing a dispersion stabilizer by a usual stirrer, homomixer, homogenizer or the like. Granulation is performed by adjusting the stirring speed and time so that the droplets of the monomer composition preferably have the desired toner particle size. After that, stirring may be performed to the extent that the particle state is maintained and the particles are prevented from settling due to the action of the dispersion stabilizer. The polymerization temperature is set to 40 ° C. or higher, generally 50 to 90 ° C. to carry out the polymerization. Further, the temperature may be raised in the latter half of the polymerization reaction, and further, in order to improve the durability characteristics in the image forming method of the present invention, the second half of the reaction in order to remove unreacted polymerizable monomer, by-products, etc. Alternatively, the aqueous medium may be partially distilled off after completion of the reaction. After the reaction is completed, the produced toner particles are collected by washing and filtration and dried. In the suspension polymerization method, usually monomer system 1
It is preferable to use 300 to 3000 parts by weight of water as a dispersion medium with respect to 00 parts by weight.

The external additive used for the purpose of imparting various toner characteristics is preferably a particle diameter of 1/10 or less of the weight average diameter of the toner particles from the viewpoint of durability when added to the toner. . The particle size of the additive means the average particle size thereof obtained by observing the surface of the toner particles with an electron microscope. As the external additive, for example, the following ones are used.

Metal oxides (aluminum oxide, titanium oxide, strontium titanate, cerium oxide, magnesium oxide, chromium oxide, tin oxide, zinc oxide, etc.), nitrides (silicon nitride, etc.), carbides (silicon carbide, etc.), metals Salts (calcium sulfate, barium sulfate, calcium carbonate, etc.), fatty acid metal salts (zinc stearate, calcium stearate, etc.), carbon black, silica, etc.

These external additives are used in an amount of 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight, based on 100 parts by weight of the toner particles. These external additives may be used alone or in combination. Those subjected to a hydrophobic treatment are more preferable.

The average particle size and particle size distribution of the toner can be measured by various methods such as Coulter Counter TA-II type or Coulter Multisizer (manufactured by Coulter Co.). In the present invention, Coulter Counter TA-I is used.
An interface (manufactured by Nikkaki) that outputs number distribution and volume distribution is connected to a PC9801 personal computer (manufactured by NEC) using type I, and a 1% NaCl aqueous solution is prepared by using primary sodium chloride as an electrolyte. For example, ISOTON R-II (manufactured by Coulter Scientific Japan) can be used. As the measuring method, 0.1 to 5 ml of a surfactant (preferably alkylbenzene sulfonate) as a dispersant is added to 100 to 150 ml of the electrolytic aqueous solution, and 2 to 20 measuring samples are further added.
Add mg. The electrolytic solution in which the sample was suspended was subjected to dispersion treatment for about 1 to 3 minutes by an ultrasonic disperser, and the volume and number of toner particles having a size of 2 μm or more were measured using a 100 μm aperture as an aperture with the Coulter Counter TA-II type. The volume distribution and number distribution were calculated. then,
The weight average particle diameter on a volume basis obtained from the volume distribution according to the present invention: was obtained (D ₄ and the representative value of the channel center value of each channel).

In the present invention, the fogging amount is measured by the reflection type densitometer (T
OKYO DENSHOKU CO. , R made by LTD
EFLECTOMETER ODEL TC-6DS)
Measurement (the worst value of the reflection density of the white background after printing is D
s, and Ds-Dr when the average reflection density of the paper before printing was Dr. Fogging amount 1.2
% Or less is a good image with substantially no fog, and 2%
If it exceeds, it is an unclear image with conspicuous fogging.

The fixing test was conducted by the following method.

Commercially available copying machine paper Canon C as recording material
Using LC SK paper (80g / m ² paper manufactured by Canon Sales Co.), remove the oil application unit of the fixing device of the commercially available Canon CLC550, and convert it into a PFA tube roller,
Change the image area ratio at a process speed of 90 mm / sec, double-sided fixability and OH at 20 mm / sec.
The permeability of P was evaluated.

[0050]

EXAMPLES The present invention will be described in more detail with reference to specific manufacturing methods, examples and comparative examples.

Example 1 To 700 g of ion-exchanged water, 0.1 M Na ₃ O ₄ aqueous solution 4 was added.
After adding 50 g and heating to 50 ° C., 10,000 rpm is obtained by using a TK homomixer (manufactured by Tokushu Kika Kogyo).
It was stirred at. 70% 1.0M-CaCl ₂ aqueous solution
g was gradually added to obtain an aqueous medium containing Ca ₃ (PO ₄ ) ₂ .

On the other hand, (monomer) styrene 165 g n-butyl acrylate 35 g (colorant) C.I. I. Pigment Blue 15: 3 10 g (charge control agent) salicylic acid metal compound 2 g (polar resin) saturated polyester 20 g (acid value 10, peak molecular weight; 16,000) (release agent) behenyl stearate (peak molecular weight 1,500) 20 g (Crosslinking Agent) Divinylbenzene 0.2 g The above formulation was heated to 50 ° C. and uniformly dissolved and dispersed at 9000 rpm using a TK homomixer (manufactured by Tokushu Kika Kogyo). 5 g of a polymerization initiator 2,2′-azobis (2,4-dimethylvaleronitrile) was dissolved in this to prepare a polymerizable monomer composition.

The above polymerizable monomer composition was charged into the above aqueous medium and stirred at 9500 rpm with a TK type homomixer at 50 ° C. under N ₂ atmosphere to granulate the polymerizable monomer composition. did.

Then, while stirring with a paddle stirring blade, the temperature was raised to 60 ° C. in 2 hours, and after 4 hours, the temperature was raised to 80 ° C. and reacted for 4 hours. After completion of the polymerization reaction, residual monomers were distilled off under reduced pressure, and after cooling, hydrochloric acid was added to dissolve calcium phosphate, followed by filtration, washing with water and drying to obtain a weight average diameter of 6.3 μm.
m colorant was obtained.

BE was added to 100 parts by weight of the obtained particles.
Hydrophobic titania having a specific surface area of 100 m ² / g by T method was externally added, and 35 μm was added to 7 parts by weight of this toner.
Of silicone resin coated ferrite carrier 9
A developer was prepared by mixing 3 parts by weight. Using this developer, double-sided fixing test and durability evaluation were performed. Toner physical properties and evaluation results are shown in Table 1.

Example 2 Table 1 shows the results of the same evaluations as in Example 1 except that styrene 155 g and n-butyl acrylate 45 g were used. As the Tg was lowered to 52 ° C., the glossiness was increased, but good results were obtained.

Comparative Example 1 Table 1 shows the results of the same evaluations as in Example 1 except that the polymerization initiator was changed to 12 g. Mp is 8,000
Since it became as small as 0, the double-sided paper passing property deteriorated.

Comparative Example 2 Table 1 shows the results of the same evaluations as in Example 2 except that 150 g of styrene and 50 g of n-butyl acrylate were used. Since both Tg and Mp became small, double-sided paper passing property was extremely deteriorated.

Comparative Example 3 Table 1 shows the results of the same evaluation as in Example 1 except that 2 g of azoisobutyronitrile was used as the polymerization initiator. Since the Mp was as large as 65,000, both double-sided paper-passing properties and OHP permeability were lowered.

Example 3 Table 1 shows the results of the same evaluations as in Example 1 except that 180 g of styrene, 20 g of n-butyl acrylate and 8 g of a polymerization initiator were used. Both the double-sided paper-passing property and the OHP permeability were slightly lower than those of Example 1, but good results were obtained.

Comparative Example 4 Table 1 shows the results of the same evaluation as in Example 1 except that 180 g of styrene, 20 g of n-butyl acrylate and 3 g of a polymerization initiator were used. Both the double-sided paper-passing property and the OHP permeability were extremely lowered.

Comparative Example 5 When the same evaluation as in Example 1 was conducted except that the ester wax was not used, the offset was severe because the release agent was not contained and the double-sided paper passing evaluation and OHP permeability evaluation could not be performed. .

Comparative Example 6 Evaluation was made in the same manner as in Example 1 except that 188 g of styrene, 12 g of n-butyl acrylate and 10 g of polymerization initiator were used.
The OHP permeability could not be evaluated.

Comparative Example 7 A toner having a Tg of about 35 ° C. was prepared in the same manner as in Example 1 except that 140 g of styrene and 60 g of n-butyl acrylate were used.
Could not be toner.

Example 4 Evaluation was made in the same manner as in Example 1 except that 8 g of paraffin wax having a peak molecular weight of 1300 was used instead of behenyl acetate, but the OHP permeability was practically no problem, but double-sided paper was passed. In 100%, the image area could not be passed.

Example 5 Evaluation was made in the same manner as in Example 4 except that 16 g of paraffin wax was used. As a result, OHP permeability was slightly deteriorated although double-sided paper passing was not a problem.

Example 6 180 parts by weight of nitrogen-substituted water and 20 parts by weight of a 0.2 wt% aqueous solution of polyvinyl alcohol were placed in a four-necked flask, and then 77 parts by weight of styrene and acrylic acid-n-
23 parts by weight of butyl, 5.0 parts by weight of 2,2′-azobis (2,4-dimethylvaleronitrile), and 0.01 parts by weight of divinylbenzene were added and stirred to obtain a suspension. After this,
After replacing the inside of the flask with nitrogen, the temperature was raised to 70 ° C. and the temperature was maintained for 10 hours to carry out a polymerization reaction.

After washing the polymer with water, it was dried in a reduced pressure environment while maintaining the temperature at 65 ° C. to obtain a resin. The resin 88w
t%, 2 wt% of salicylic acid metal compound, 5 wt% of phthalocyanine pigment, 8 wt% of ester wax are mixed by a fixed tank type dry mixer, and the vent port is connected to a suction pump and sucked, and melt-kneaded by a twin-screw extruder. went.

The melt-kneaded product was crushed with a hammer mill to obtain a crushed product of the toner composition having a 1 mm mesh pass.
Further, this coarsely pulverized product was pulverized by a mechanical pulverizer to a volume average diameter of 20 to 30 μm, then pulverized by a jet mill utilizing collision between particles in a swirling flow, and classified by a multistage classifier. After carrying out to obtain a toner composition having an average particle size of 7.5 μm, the same evaluation was performed.

As a result, both developability and transferability are reduced,
Fog was slightly noticeable and the image density was lowered, but practically acceptable results including the fixability were obtained.

[0071]

[Table 1]

Example 7 C.I. I. Pigment Blue 15: 3, quinacridone pigment, C.I. I. Pigment Yellow 13 and carbon black were used to produce magenta, yellow, and black toners, respectively, and the cyan toner of Example 1 was also evaluated by the above-mentioned modified CLC550 machine. Color reproducibility and OHP transparency were evaluated. A good full-color image was obtained without problems such as double-sided fixability and fogging.

[0073]

According to the present invention, an OHP having good transparency can be obtained without impairing the fixing property on both sides, and a toner having no fog, a high image density, and stable durability can be obtained.

Claims (6)

[Claims] 1. A toner having at least a binder resin, a colorant and a release agent, wherein the toner has a glass transition temperature (Tg) of 40 to 80 ° C., and the peak of the molecular weight distribution of the toluene-soluble component of the toner. (Mp) has a molecular weight of 10,000
A toner for forming a full-color image, which is in the range of 0 to 60,000 and satisfies the following condition 210 ≦ 4 × Tg + Mp × 10 ⁻³ ≦ 330. 2. The release agent has a molecular weight of 300 or more and 3,0.
The full-color image forming toner according to claim 1, having a peak molecular weight of 00 or less. 3. The full-color image forming toner according to claim 1, wherein the toner is obtained by polymerizing a polymerizable monomer composition. 4. When polymerizing the polymerizable monomer composition,
The full-color image forming toner according to any one of claims 1 to 3, wherein the crosslinking agent is contained in an amount of 0.01 to 0.5 part by weight based on the polymerizable monomer. 5. The toner for full-color image formation according to claim 1, wherein a polyester resin is contained as a binder resin of the toner. 6. The full-color image forming toner according to claim 1, wherein the releasing agent of the toner contains an ester wax.