JPH08123082A - Resin composition for toner and toner - Google Patents

Abstract

PURPOSE: To obtain a resin compsn. for toner and a toner excellent in anti- offsetting property, low-temp. fixability and blocking resistance, especially more excellent in low-temp. fixability, giving a sufficiently stable image even in the case of copying with a high-speed electrophotographic copying machine and having satisfactory pulverizability. CONSTITUTION: This resin compsn. consists of 50-94.8wt.% styrene polymer (a) contg. >=60wt.% styrene monomer and having a wt. average mol. wt. of <=40,000, 0.2-10wt.% styrene polymer (b) contg. >=60wt.% styrene monomer and having a wt. average mol. wt. of >=100,000 and 5-49.8wt.% (meth)acrylic ester polymer (c) contg. >=60wt.% (meth) acrylic ester monomer and having a wt. average mol. wt. of >=100,000 or crosslinked (meth)acrylic ester polymer (d) contg. >=60wt.% (meth)acrylic ester monomer and having >=20wt.% gel fraction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toner composition and toner for use in electrophotography, copying machines, printers and the like, and more specifically, for toner used in a method of developing an electrostatic image. The present invention relates to a resin composition and a toner.

[0002]

2. Description of the Related Art In electrophotography and the like, a dry developing system is often used as a method for developing an electrostatic charge image. In this dry development method, a triboelectrically-charged toner obtained by mixing a colorant such as carbon black and other additives into a resin composition for a toner as a binder to make a fine powder and mixing a carrier such as iron powder or glass beads (developing Agent) is used. To obtain a visible image, an electrostatic latent image is usually formed on a photoconductor, a triboelectrically-charged toner is electrically attached to the electrostatic latent image and developed, and the toner image obtained here is obtained. Is transferred onto a sheet such as a sheet of paper, and then fixed by a hot-pressing roller having releasability to toner to form a permanent visible image.

This type of toner mainly has anti-offset property (the toner adheres to a hot pressing roller for fixing and does not stain the paper) and low temperature fixability (the toner firmly adheres to the paper at low temperature). , Blocking resistance (toner particles do not aggregate during storage), and image stability (there is no variation in the toner charge amount and the relationship between the electrostatic latent image and the image density is stable). In addition, a resin composition for toner having good pulverizability is also required for the production of toner.

A toner having improved offset resistance, low-temperature fixing property, blocking resistance and fine pulverization property is composed of a low molecular weight vinyl polymer component and a high molecular weight vinyl polymer component, and comprises a styrene monomer. And / or a toner using a resin composition for a toner containing a (meth) acrylic acid ester-based monomer as a structural unit of each of the polymer components is widely known.

The glass transition point of the low molecular weight vinyl polymer component is 50 ° C. or higher and the weight average molecular weight thereof is 50,000 or lower, and the glass transition point of the high molecular weight vinyl polymer component is 65 ° C. or lower. A toner using a resin composition for toner having a weight average molecular weight of 50,000 or more and a glass transition point of the resin composition of 50 ° C. or more is also disclosed in, for example, JP-A-56.
No. 158340.

A copolymer resin having a styrene-based monomer and a (meth) acrylic acid ester-based monomer as constituent units, which is a gel permeation chromatography (G
PC) is divided into a resin having a molecular weight of 30,000 or more and a resin having a molecular weight of less than 30,000, the glass transition point of the resin having a molecular weight of 30,000 or more is −20 to 40 ° C. and the glass transition point of the resin having a molecular weight of less than 30,000 is 50. Toners using a resin composition for toner having a temperature of -100 ° C. and having improved low-temperature fixability are also disclosed in, for example, Japanese Patent Application Laid-Open No. 4-204457. Further, a low molecular weight vinyl polymer component (weight average molecular weight 3,000 to 50,000, glass transition point 40 to 90 ° C.) is used as a toner having improved image stability as well as offset resistance, low temperature fixing property and blocking resistance. Matrix phase (sea) of
Domain particles (islands) of carboxylic acid-modified high molecular weight (weight average molecular weight 6,000 to 1,000,000, glass transition point 0 to 60 ° C., acid value 15 or more) dispersed in this matrix phase A toner using the resin composition for toner formed by and is disclosed in, for example, JP-A-4-366176.

The conventional toner as described above usually contains a charge control agent for controlling the triboelectric chargeability. As the charge control agent, nigrosine and spiron black (Hodogaya Chemical Co., Ltd.) are used. Dyes) and other phthalocyanine-based pigments are known.

[0008]

The conventional toner described above is
All of them have good offset resistance, low-temperature fixing property, and blocking resistance, and have maintained a certain level of charge control ability and image stability, but have been in high demand for high-speed and small electronic devices in recent years. In the case of copying using a copying machine, the above performance is not always sufficiently satisfactory, and a toner having further improved low temperature fixing property is demanded. The present invention solves the problems of such conventional toners, and its object is to have excellent offset resistance, low-temperature fixing property, and blocking resistance, and among them, particularly excellent offset resistance and It is an object of the present invention to provide a resin composition for toner and a toner having good fine pulverizability, which has further excellent low-temperature fixability and can obtain a sufficiently stable image even when copying is performed using a high-speed type electronic copying machine.

[0009]

A resin composition for a toner according to the present invention contains 60% by weight or more of a styrene monomer and has a weight average molecular weight of 40,000 or less.
To 94.8% by weight, 60% by weight or more of styrene-based monomer, 0.2 to 10% by weight of styrene-based polymer (B) having a weight average molecular weight of 100,000 or more, and (meth) acrylic acid ester. Containing 60% by weight or more of a base monomer and 60% by weight or more of a (meth) acrylic acid ester polymer (C) having a weight average molecular weight of 100,000 or more, or a (meth) acrylic acid ester monomer. And the gel fraction is 20% by weight or more, the crosslinked (meth) acrylic acid ester-based polymer (D) 5
It consists of 49.8% by weight.

The styrenic monomer used in the present invention is 6
A styrene polymer (A) containing 0% by weight or more and a weight average molecular weight of 40,000 or less, and a styrene polymer (B) containing 60% by weight or more of a styrene monomer and a weight average molecular weight of 100,000 or more. ) Is a polymer of a styrene monomer or a copolymer of another vinyl monomer copolymerizable with the styrene monomer.

The styrene monomer is styrene or a styrene derivative, and examples thereof include o-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, butylstyrene and pt-butylstyrene. , P-hexylstyrene, p-octylstyrene, p
-Dodecylstyrene, p-methoxystyrene, p-phenylstyrene, p-chlorostyrene, 3,4-dichlorostyrene, vinyltoluene and the like can be mentioned.

Other vinyl-based monomers copolymerizable with the styrene-based monomer include (meth) acrylic acid ester-based monomers, acrylic acid, methacrylic acid, fumaric acid,
(Anhydrous) Maleic acid, citraconic acid, vinyl monomer having a carboxyl group such as itaconic acid, hydroxypropyl methacrylate, 2-hydroxyethyl acrylate,
Vinyl-based monomers having a hydroxyl group such as hydroxypropyl acrylate, vinyl-based monomers having an epoxy group such as glycidyl methacrylate, acrylonitrile, vinyl-based monomers having a nitrile group such as methacrylonitrile, acrylamide, N-methylol acrylamide,
Examples thereof include vinyl monomers having an acid amide group such as diacetone acrylamide, polyfunctional vinyl monomers such as divinylbenzene and trimethylolpropane triacrylate, and vinyl acetate.

The styrene-based polymer is preferably a homopolymer of a styrene-based monomer or a copolymer of a styrene-based monomer and a (meth) acrylic acid ester-based monomer.

The (meth) acrylic acid ester-based polymer (C) containing 60% by weight or more of the (meth) acrylic acid ester-based monomer used in the present invention and having a weight average molecular weight of 100,000 or more is ) A polymer of an acrylic acid ester-based monomer or a copolymer of another vinyl-based monomer copolymerizable with the (meth) acrylic acid ester-based monomer.

Examples of the (meth) acrylic acid ester-based monomer include (meth) acrylic acid ester and (meth)
Acrylic ester derivatives, for example, methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, butyl acrylate, isobutyl acrylate, octyl acrylate, dodecyl acrylate,
2-ethylhexyl acrylate, stearyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, isobutyl methacrylate, hexyl methacrylate, lauryl methacrylate, 2-chloroethyl acrylate, acrylic acid Phenyl, α-chloroacrylate, phenyl methacrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, 2-hydroxyethyl methacrylate, glycidyl methacrylate, bisglycidyl methacrylate, polyethylene glycol dimethacrylate, trimethylolpropane triacrylate, Methacryloxyethyl phosphate and the like can be mentioned.

Examples of the other vinyl-based monomer copolymerizable with the (meth) acrylic acid ester-based monomer include, for example, the above-mentioned styrene-based monomers and other vinyl-based monomers copolymerizable with the styrene-based monomers. The same compound as the vinyl-based monomer can be used.

The (meth) acrylic acid ester-based polymer may be a polymer of a (meth) acrylic acid ester-based monomer or a copolymer of a (meth) acrylic acid ester-based monomer and a styrene-based monomer. Polymers are preferred.

It contains 60% by weight or more of the (meth) acrylic acid ester type monomer used in the present invention and has a gel fraction of 2
0% by weight or more of the crosslinked (meth) acrylic acid ester-based polymer (D) includes a (meth) acrylic acid ester-based monomer and a polyfunctional monomer, a (meth) acrylic acid ester-based monomer,
It is a polymer composed of other vinyl-based monomers and polyfunctional monomers copolymerizable with (meth) acrylic acid ester-based monomers.

As the above-mentioned polyfunctional monomer, a vinyl group,
It has two or more unsaturated groups such as (meth) acryloyl group and allyl group in one molecule and reacts with a (meth) acrylic acid ester-based monomer to obtain a crosslinked (meth) acrylic acid ester-based polymer. Examples of known compounds include polyethylene glycol dimethacrylate, divinylbenzene, trimethylolpropane triacrylate, and diallyl phthalate.

When the content of the polyfunctional monomer is high, the crosslinking density is high and the flexibility is low, and when it is low, the fluidity is high. Therefore, 100 parts by weight of the (meth) acrylic acid ester monomer is used. On the other hand, it is preferably 0.01 to 2 parts by weight, more preferably 0.1 to 1 part by weight.

When the content of the styrene-based monomer is small, the styrene-based polymer (A) has low chargeability and fine pulverizability, and thus the (meth) acrylic acid ester-based polymer (C).
Alternatively, when it is compatible with the crosslinked (meth) acrylic acid ester polymer (D) and used as a toner, the low-temperature fixing property is lowered, or it is easy to aggregate to reduce the storage stability. 60% by weight because pulverizability and fixability are reduced
The above is a styrene-based polymer containing 80% by weight or more and preferably having a weight average molecular weight of 40,000 or less. Such a styrene polymer (A) has a hard and brittle property.

The styrene polymer (B) is a styrene polymer having a styrene monomer as a constituent unit of the polymer component and a weight average molecular weight of 100,000 or more. Such a high molecular weight vinyl polymer component is compatible with the styrene polymer (A) at the molecular level, and imparts a tenacious property. That is, when the content of the styrene-based monomer decreases, it becomes compatible with the styrene-based polymer (A) containing 60% by weight or more of the styrene-based monomer and having a weight average molecular weight of 40,000 or less at the molecular level. Since it does not form domain particles without adding tenacious properties to the styrene-based polymer (A), it is 60% by weight or more, preferably 80% by weight or more. Further, when the weight average molecular weight is small, the effect of adding tenacious properties is reduced, so that it is 100,000 or more.

The (meth) acrylic acid ester-based polymer (C) used in the present invention contains 60% by weight or more of a styrene-based monomer when the content of the (meth) acrylic acid ester-based monomer decreases. However, since it is compatible with the styrene-based polymer (A) having a weight average molecular weight of 40,000 or less, the low temperature fixing property of the obtained toner is lowered, the toner is apt to aggregate, and the storage stability is deteriorated. % Or more, preferably 8
When the content is 0% by weight or more and the weight average molecular weight is low, the offset resistance of the obtained toner is lowered, and therefore it is 100,000 or more.

The crosslinked (meth) acrylic acid ester-based polymer (D) used in the present invention has a low content of the (meth) acrylic acid ester-based monomer and a low gel fraction. When the molecular weight is low, the offset resistance of the resulting toner is low, and therefore 60% by weight or more, preferably 80% by weight or more, the gel fraction is 20% by weight or more, and the weight average molecular weight is 100,000 or more. is there.

If the gel fraction (solvent-insoluble matter) becomes high, the low-temperature fixability of the toner obtained will deteriorate, so that it is preferably 75% or less. Where gel fraction (solvent insoluble)
Is a value measured using a tetrahydrofuran solvent.

The (meth) acrylic acid ester polymer (C) and the crosslinked (meth) acrylic acid ester polymer (D) have soft and tenacious properties.

The weight average molecular weights of the styrene polymers (A), (B) and the (meth) acrylic acid ester polymer (C) are determined by gel permeation chromatography (hereinafter referred to as "GPC"). Is the weight average molecular weight measured using a monodisperse polystyrene standard sample.

The above-mentioned styrene polymer (A), styrene polymer (B), (meth) acrylic acid ester polymer (C) and crosslinked (meth) acrylic acid ester polymer (D) are suspended. It can be prepared by a known polymerization method such as polymerization, emulsion polymerization, solution polymerization and bulk polymerization.

If the amount of the styrene-based polymer (A) added to the resin composition for a toner of the present invention is small, fine pulverizability is deteriorated, and if it is large, blocking resistance is deteriorated.
It is 94.8% by weight.

When the addition amount of the styrene polymer (B), the (meth) acrylic acid ester polymer (C) or the crosslinked (meth) acrylic acid ester polymer (D) of the present invention is small, the offset resistance is low. The styrenic polymer (B) has the following problem.
0.2 wt% to 10 wt%, 5 to 49.8 wt% of the (meth) acrylic acid ester polymer (C) or the crosslinked (meth) acrylic acid ester polymer (D).

In the range where the styrene polymer (A) and the styrene polymer (B) are compatible at the molecular level, the styrene polymer (A) and the (meth) acrylic acid ester polymer (C) are used. Or styrene-based polymer (A) and crosslinked (meth)
Random, block, or graft polymers may be used as long as the acrylic ester polymer (D) is incompatible.

To produce the resin composition for toner of the present invention, the styrene polymer (A) and the styrene polymer (B) are used.
Alternatively, a method of melt-kneading the (meth) acrylic acid ester-based polymer (C) or the crosslinked (meth) acrylic acid ester-based polymer (D) may be used, but a styrene-based polymer ( A method of dissolving and mixing A) with the styrene-based polymer (B) and the (meth) acrylic acid ester-based polymer (C) or the crosslinked (meth) acrylic acid ester-based polymer (D) is preferable, The styrene-based polymer (A) is polymerized in the presence of the styrene-based polymer (B) and the (meth) acrylic acid ester-based polymer (C) or the crosslinked (meth) acrylic acid ester-based polymer (D). The method of mixing by mixing is more preferable.

The toner resin composition of the present invention is dispersed in a styrene-based polymer (A), a styrene-based polymer (B), a (meth) acrylic acid ester-based polymer (C) or a crosslinked (meth) acrylic. It is controlled by the composition of the acid ester polymer (D), the weight average molecular weight, the glass transition temperature, the conditions of melt-kneading, or in the case of solution mixing, by selecting the solvent thereof or by using an appropriate compatibilizer. be able to.

The resin composition for a toner 2 of the present invention is the styrene polymer (A) and the styrene polymer (B) of the present invention.
And become a matrix phase (sea) by compatibilizing each other at the molecular level, and the (meth) acrylic acid ester polymer (C) or the crosslinked (meth) acrylic acid ester polymer (D) is matrixed as domain particles (islands). It is characterized by having a separated structure dispersed in the phase.

The domain particles having the above phase separation structure are spherical,
The shape such as a cylindrical shape or a lamella shape is not limited.

These phase-separated structures can be confirmed by, for example, a transmission electron microscope of a section obtained by cutting the resin composition for toner with an ultramicrotome.

After sufficiently kneading with a roll mill, kneader, extruder, etc., the size of the above domain particles is 3 μm.
The size is preferably m or less, preferably 0.1 to 1 μm.

The above phase-separated structure has the styrene polymer (A), the styrene polymer (B), the (meth) acrylic acid ester polymer (C) or the crosslinked (meth) acrylic acid ester polymer of the present invention. It can be formed by dissolving or dispersing the compound (D) in a solvent and then removing the solvent, or by melt mixing with a roll mill or a pressure kneader. Preferably, the styrene polymer (B),
(Meth) acrylic acid ester-based polymer (C) or crosslinked (meth) acrylic acid ester-based polymer (D) is dissolved or dispersed in a solvent to co-polymerize styrene-based polymer (A) Form.

The toner 3 of the present invention is obtained by blending the resin composition for toner of the present invention or the present invention 2, a colorant, a charge control agent, and other conventional additives for toner.

Examples of the above colorants include pigments or dyes which are commonly used in toners of this type, such as carbon black, chrome yellow, aniline blue and the like. Examples of the charge control agent include dyes such as nigrosine and spirone black (manufactured by Hodogaya Chemical Co., Ltd.), and other charge control agents including phthalocyanine pigments. Examples of the conventional toner additives include polypropylene wax, low molecular weight polyethylene, other aliphatic amides, bisaliphatic amides, metal soaps, paraffins, etc., which have a releasing action on fixing rollers of printers and copying machines. To be

Further, in order to increase the fluidity of the toner particles, hydrophobic silica or the like may be added later. Further, in order to obtain a magnetic toner, magnetic powder made of iron or zinc such as magnetite, ferrite or hematite, or an alloy or compound showing ferromagnetism such as zinc, cobalt, nickel or manganese may be mixed.

Further, in the resin composition for toner or the toner, polyester resin, polyether resin, xylene resin, epoxy resin, butyral resin, coumarone / indene resin, terpene resin, hydrocarbon resin, A known binder resin other than a vinyl polymer such as a petroleum resin may be blended in the range of 20% by weight or less. These binder resins may be present in a phase-separated state, or may be present in any of the phases in a compatibilized state at the molecular level.

A publicly known method is used for producing the above-mentioned toner. For example, a colorant, a charge control agent and other conventional additives for toner are blended with the above-mentioned resin composition for toner, and this is added. A method of kneading using a roll mill, a kneader, an extruder or the like, followed by cooling and finely pulverizing may be mentioned.

[0044]

EXAMPLES Examples and comparative examples of the present invention will be shown below. The term "part" means "part by weight".

(Preparation of styrene-based polymer (B), (meth) acrylic acid ester-based polymer (C) and crosslinked (meth) acrylic acid ester-based polymer (D)) Spiral in a 1 liter cylindrical reactor A stirrer, a reflux condenser, a nitrogen inlet pipe, and a thermocouple for temperature measurement were attached to this, and ethyl acetate 1
00 parts, predetermined amount of monomers shown in Table 1, predetermined amount of N,
N'-azobisisobutyronitrile (polymerization initiator) was added, a nitrogen purge was carried out, and solution polymerization was carried out while stirring at 50 to 70 ° C for 20 hours. The weight average molecular weight of the polymer was adjusted by adjusting the addition amount of the polymerization initiator and appropriately setting the polymerization temperature in the range of 50 to 70 ° C.

[0046]

[Table 1]

Then, the obtained polymer solution was cast into a film form and ethyl acetate was removed in a vacuum chamber to obtain a styrene polymer (B), a (meth) acrylic acid ester polymer (C), A crosslinked (meth) acrylic acid ester polymer (D) was obtained. The weight average molecular weight of this polymer is shown in Table 1.

(Examples 1 to 3) (Preparation of Resin Composition for Toner) A spiral stirrer, a reflux condenser, a nitrogen inlet tube, and a thermocouple for temperature measurement were attached to a 1-liter cylindrical reactor, and this was attached. Styrene-based polymer (B) with the composition shown in Table 2, (meth) acrylic acid ester-based polymer (C) or crosslinked (meth) acrylic acid ester-based polymer (D), and 50 parts of toluene were further added, and nitrogen was added. While purging, it was heated to the boiling point of toluene and dissolved.
Thereafter, after the boiling of toluene was started, a predetermined amount of the monomer shown in Table 2 was added to a predetermined amount of benzoyl peroxide (polymerization initiator).
The solution was slowly added dropwise over 4 hours to carry out solution polymerization. The weight average molecular weight of the polymer was adjusted by adjusting the addition amount of the polymerization initiator.

[0049]

[Table 2]

After that, the reflux condenser was removed and a decompression device was attached, and the mixture was heated to 140 to 170 ° C. to remove toluene and obtain a resin composition for toner.

For reference, the styrene polymer (B),
Without using the (meth) acrylic acid ester polymer (C) or the crosslinked (meth) acrylic acid ester polymer (D), solution polymerization of the monomers in Table 2 was carried out in the same manner as described above to obtain a styrene-based polymer. A coalescence (A) was obtained. The weight average molecular weight of this styrene polymer (A) is shown in Table 2.

Observation of the resin composition for a toner under a microscope revealed that the styrene-based polymer (A) and the styrene-based polymer (B) were compatible with each other at the molecular level in all Examples. It was confirmed that the phase separation structure was formed by the matrix phase and the domain particles of the (meth) acrylic acid ester polymer (C) or the crosslinked (meth) acrylic acid ester polymer (D).

(Preparation of Toner) 100 parts of the obtained resin composition for toner shown in Table 3, 6 parts of carbon black (MA-100 manufactured by Mitsubishi Kasei Co.) and Spiron Black TRH
1 part (manufactured by Hodogaya Chemical Co., Ltd.) and 3 parts of polypropylene wax (manufactured by Sanyo Chemical Co., Ltd .: Viscole 660P) are melt-kneaded by a roll mill, cooled, ground by a jet mill and classified to obtain a toner powder having an average particle size of 11 μm. Obtained.

[0054]

[Table 3]

To the toner powder thus obtained, 0.3 part of hydrophobic silica powder (R-972 manufactured by Nippon Aerosil Co., Ltd.) was externally added to prepare a toner.

(Comparative Examples 1 to 5) The same procedure as in Examples 1 to 3 was carried out except that the ingredients were blended as shown in Table 3.

The toners obtained in Examples 1 to 3 and Comparative Examples 1 to 5 were evaluated for blocking resistance, fixing temperature and offset temperature, and the results are shown in Table 3.

(Evaluation of Toner Properties) (Blocking Resistance) 10 g of the toner obtained above was used as 1
The mixture was placed in a 00 ml sample bottle and left in a constant temperature bath at 50 ° C. for 16 hours, and the aggregation rate was measured with a powder tester (manufactured by Hosokawa Micron Co.). The results are shown in Table 3. The blocking resistance is preferably less than 3% by weight.

(Measurement of Fixing Temperature) 4 parts of the toner obtained above and 96 parts of iron powder carrier having a particle size of 50 to 80 μm are uniformly mixed to prepare a developer, and this developer is used to The fixing temperature and the offset temperature were measured in this manner, and the results are shown in Table 3. The temperature of the hot-pressing roller for fixing of the electrophotographic copying machine (Vivace 310 manufactured by Fuji Xerox Co., Ltd.) was measured while changing the temperature from 120 to 200 ° C. The fixing temperature is set when the set temperature of the fixing heat roller of the electrophotographic copying machine is changed stepwise to make a copy, and when the copy image is rubbed with a sand eraser for a typewriter, the density of the copy image changes. And the roll temperature.

(Measurement of offset temperature) As in the above case, the offset generation temperature is a roll when an offset (double image) is generated by gradually changing the set temperature of the fixing heat-pressing roller of the electrophotographic copying machine. Temperature.

In the above Examples and Comparative Examples, the weight average molecular weight and gel fraction were measured by the following methods. (Measurement of Weight Average Molecular Weight) Gel Permeation Chromatography (GPC) Method Device: Waters 510 type high pressure pump Waters 410 type differential refractometer (IR detector) Column: Showa Denko Shodex KF-80M 2 bottles Showa Denko Shodex KF-802.5 1 piece Measurement temperature: 40 ° C. Sample solution: 0.5 wt% tetrahydrofuran solution (passed through 0.45 μm filter) Injection volume: 300 microliters Calibration sample: Standard polystyrene

(Measurement of Gel Fraction) A sample was dissolved in a tetrahydrofuran solution, filtered with a 1 μm filter, and the gel content (solvent-insoluble content) remaining on the filter was vacuum dried. It was calculated by the ratio of weight / sample weight (percentage).

INDUSTRIAL APPLICABILITY The present invention, the resin composition for a toner of the present invention 2 and the toner of the present invention 3 which is constituted as described above, have offset resistance, low temperature fixing property and blocking resistance. Excellent in fine pulverizability, and among them, particularly excellent in offset resistance and low temperature fixing property,
Even when copying using a high-speed or small electronic copying machine,
A remarkable effect that a sufficiently stable image can be obtained is obtained.

Claims (3)

[Claims] 1. A styrene-based polymer containing (A) a styrene-based monomer in an amount of 60% by weight or more and having a weight average molecular weight of 40,000 or less, and (B) a styrene-based monomer. 60
0.2 to 10% by weight of a styrene-based polymer having a weight average molecular weight of 100,000 or more and (C) (meth)
Containing 60% by weight or more of acrylic acid ester-based monomer,
Crosslinking containing 60% by weight or more of (meth) acrylic acid ester-based polymer having a weight average molecular weight of 100,000 or more, or (D) (meth) acrylic acid ester-based monomer and having a gel fraction of 20% by weight or more. (Meth) acrylic acid ester-based polymer 5
The resin composition for a toner is characterized by comprising 4 to 99.8% by weight. 2. A styrene polymer (A) containing 60% by weight or more of the styrene-based monomer and having a weight average molecular weight of 40,000 or less; and 60% by weight or more of the styrene-based monomer. A matrix phase composed of a styrene-based polymer (B) having a weight average molecular weight of 100,000 or more and 60% by weight or more of the (meth) acrylic acid ester-based monomer, and a weight average molecular weight of 100,000 or more (meta ) Acrylic ester-based polymer (C) or (meth) acrylic acid ester-based monomer is contained in an amount of 60% by weight or more, and a gel fraction is 20% by weight or more in a crosslinked (meth) acrylic acid ester-based polymer (D The resin composition for a toner, comprising: 3. A toner comprising the resin composition for toner according to claim 1 or 2.