JP2001324832A - Resin composition for toner, and toner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for toner and a toner maintaining good offset resistance, low temperature fixing property and storage property and causing no fog due to production of fine powder in a developing machine. SOLUTION: The resin composition for toner essentially comprises a polyester block copolymer having 3×103 to 5×104 weight average mol.wt. and containing polyester blocks by condensation of aliphatic diols and dicarboxylic acids and polyester blocks by condensation of alicyclic diols and dicarboxylic acids.

Description

DETAILED DESCRIPTION OF THE INVENTION

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

[0001]

2. Description of the Related Art A dry developing method is frequently used as a method for developing an electrostatic image in electrophotography or the like. In the dry development method, toner is usually charged by friction with iron powder or glass beads called a carrier, and this is attached to an electrostatic latent image on a photoreceptor by electrical attraction,
Next, the image is transferred onto a sheet and fixed by a hot roll or the like to form a permanent visible image.

As a fixing method, there is a heating roller method in which a toner image of a sheet to be fixed is caused to pass through the surface of a heating roller having a surface formed of a material having a releasing property with respect to toner while being brought into pressure contact with the surface. It is heavily used. In the heating roller method, a toner that can be fixed at a lower temperature has been demanded in order to improve economy such as power consumption and to increase copying speed.

However, in order to improve the low-temperature fixability, an offset phenomenon in which a part of the toner adheres to the surface of the heat fixing roller and is retransferred to paper is likely to occur, or the storage stability is deteriorated. There is a problem.

To solve these problems, bisphenol A
There have been many attempts to improve low-temperature fixability, offset resistance, and storage stability by using a bisphenol A derivative such as an alkylene oxide adduct as a diol component of a polyester resin. However, in recent years, bisphenol A has been suspected of being an endocrine disrupting substance, and it has begun to be considered unfavorable to use it as a raw material for toner, which is a powder that is easily scattered. In addition, the use of a bisphenol A derivative-containing polyester resin presents problems in deterioration of dyes and pigments of the toner and light fastness after fixing.

[0005] Bisphenol A having such a problem
A method using an alicyclic diol over a derivative has been proposed. For example, JP-A-4-337774 discloses a polyester obtained by polycondensation of a diol comprising an alicyclic diol and an aliphatic diol, and a polycarboxylic acid comprising an aromatic dicarboxylic acid and a trivalent or higher polycarboxylic acid. An electrophotographic toner containing a resin as a main component of a binder resin is disclosed.

However, the toner disclosed in the above publication is
Cross-linking with a polycarboxylic acid may improve the offset resistance, but the low-temperature fixability is not sufficient.

There is also an attempt to balance the offset resistance and the low-temperature fixability to address the above problem. As these attempts, for example, there is a method of blending a low molecular weight polyester resin for improving low-temperature fixability and a high molecular weight polyester resin for improving offset resistance. However, using the above method, a polyester resin obtained by random polycondensation of a diol component composed of an alicyclic diol and an aliphatic diol and a dicarboxylic acid component into a low molecular weight polyester resin has a low-temperature fixability and storage stability. It is difficult to balance the properties and properties related to the resin strength, and when trying to improve the low-temperature fixability, the toner preservability decreases, the resin strength decreases,
This causes another problem that the generation of fine powder in the developing machine becomes remarkable and fog is easily generated.

[0008]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned drawbacks, and has good offset resistance, low-temperature fixability and storability, and generates fine powder in a developing machine. It is an object of the present invention to provide a toner resin composition and a toner which do not cause fogging due to toner.

[0009]

The resin composition for a toner according to the first aspect of the present invention is obtained by condensing an aliphatic diol and a dicarboxylic acid with a polyester block, and condensing an alicyclic diol with a dicarboxylic acid. Weight average molecular weight 3 × 10 ³ -5 containing polyester block in the molecule
It is composed mainly of × 10 ⁴ polyester block copolymer.

[0010] The resin composition for a toner according to the second aspect of the present invention is the resin composition for a toner according to the first aspect of the present invention, wherein 10 to 55 mol% of a polyester block component obtained by condensing an aliphatic diol and a dicarboxylic acid. And a polyester block copolymer containing 90 to 45 mol% of a polyester block component obtained by condensing an alicyclic diol and a dicarboxylic acid.

A third aspect of the present invention is a resin composition for a toner according to the first or second aspect, wherein the dicarboxylic acid contains phthalic anhydride.

The resin composition for a toner according to the fourth aspect of the present invention is the resin composition for a toner according to any one of the first to third aspects, wherein the glass transition point is 50 ° C. or higher,
It has a softening point of 120 ° C. or less.

The resin composition for a toner according to the fifth aspect of the present invention is a crosslinked polyester which does not contain a bisphenol A derivative as a diol component in the resin composition for a toner according to the first aspect of the invention. It is obtained by blending a polymer.

The toner according to the invention of claim 6 is the first invention.
Wherein the resin composition for a toner according to any one of (1) to (5) is contained.

The aliphatic diol used in the present invention is not particularly limited. For example, ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4 -Butanediol, 2,2-dimethylpropane-1,3-diol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like.

The alicyclic diol is not particularly restricted but includes, for example, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, hydrogenated bisphenol A, and alkylene oxide adduct of hydrogenated bisphenol A. And the like.

The above dicarboxylic acids are divalent carboxylic acids or acid anhydrides thereof or lower alkyl esters thereof, and are not particularly limited. Examples thereof include phthalic acid, terephthalic acid, isophthalic acid, and succinic acid. , Adipic acid, sebacic acid, azelaic acid, octylsuccinic acid, cyclohexanedicarboxylic acid, fumaric acid, maleic acid, itaconic acid, and acid anhydrides and lower alkyl esters thereof. Above all, phthalic anhydride is preferably used because it facilitates the esterification reaction and can suppress a decrease in the glass transition point ( _Tmg ).

The polyester block obtained by condensing the aliphatic diol and dicarboxylic acid used in the present invention (hereinafter referred to as "polyester block").
The method for preparing a polyester block (hereinafter abbreviated as polyester block B) obtained by condensing an alicyclic diol and a dicarboxylic acid with a polyester block A) is not particularly limited. Can be obtained by a polyester condensation polymerization reaction.
Polyester block A and polyester block B
Can be obtained by subjecting the polyester block A and the polyester block B to a dehydration-condensation polymerization reaction and a diol-condensation polymerization reaction in a conventional manner. The method for preparing the polyester block copolymer used in the present invention is not limited to the above-described preparation method.

The weight average molecular weight of the polyester block copolymer was measured by gel permeation chromatography (GPC). GPC uses "HTR-C" manufactured by Japan Millipore Limited as an apparatus.
As a column, "KF-800P" (1
Book), “KF-806M” (2) and “KF-80”
2.5 "(one) were used in series. The measurement conditions were a temperature of 40 ° C., a THF concentration of 0.2% by weight in THF solution (passed through a 0.45 μm filter), an injection amount of 100 μl, and standard polystyrene as a calibration sample.

[0020] In a weight average molecular weight of the polyester block copolymer is less than 3 × 10 ^3, the resin strength is reduced, the resulting toner is generated fines in developing machine becomes susceptible to fogging, a 5 × 10 ⁴ If it is more than 3 × 10 ^{3 to} 5 × 10 ³
Limited to the range of ⁴ .

The content ratio of the polyester block A to the polyester block B in the polyester block copolymer is preferably 90 to 45 mol% of the polyester block B with respect to 10 to 55 mol% of the polyester block A. If the ratio is out of the above range, the balance between low-temperature fixability, storage stability, and resin strength is deteriorated, which may lead to the above-described trouble.

The glass transition temperature (T _mg ) of the resin composition for a toner of the present invention is preferably not less than 50 ° C. since the storage stability may be reduced if the glass transition temperature is too low.
The above T _mg is measured in accordance with JIS K 7121, and means the midpoint glass transition temperature described in the standard (9.3 “How to determine glass transition temperature”). is there.

The softening point of the resin composition for a toner of the present invention is preferably 130 ° C. or lower, because if the softening point is too high, the fixing property is lowered. The softening point was measured using a Koka type flow tester (CFT-500, manufactured by Shimadzu Corporation).
"Type"), the temperature was measured in accordance with the flow softening point measurement conditions shown in Table 1, and the temperature at point T (flow softening point) on the flow curve corresponding to h / 2 in the analysis flowchart shown in FIG. Is what it means.

[0024]

[Table 1]

The above-mentioned softening point differs depending on the type of a dye or pigment used as a colorant described later, and is preferably 120 ° C. for a resin composition for a full-color toner. If so,
13 slightly higher in temperature than the resin composition for full-color toner
It is preferable that the temperature is 0 ° C. or lower.

The above polyester block copolymer includes:
It is preferable that a resin composition for toner is prepared by blending a crosslinked polyester polymer not containing a bisphenol A derivative as a diol component (hereinafter simply referred to as a crosslinked polyester polymer). Of course, depending on the type of a dye or pigment described below used as a colorant, it may not be necessary to mix a crosslinked polyester polymer. The offset property can be significantly improved.

The above-mentioned crosslinked polyester polymer excludes a bisphenol A derivative suspected of being an endocrine disrupting substance. For example, trivalent or higher carboxylic acids and / or trivalent or higher alcohols, dicarboxylic acids and diols Is obtained by condensation polymerization of a dicarboxylic acid and a diol by a conventional method, followed by reaction with a crosslinking agent such as a diisocyanate compound or an epoxy compound.

If the flow softening point of the above crosslinked polyester polymer is too high, the fixability will be reduced, and if it is too low, the effect of improving the offset resistance will not be exhibited.
0-200 ° C. The glass transition point (T _mg ) of the above crosslinked polyester polymer is preferably 50 ° C. or more, because if it is too low, the storage stability will decrease.

With respect to the mixing ratio of the crosslinked polyester polymer to the polyester block copolymer, in the case of a resin composition for a monochrome toner, if the mixing ratio of the crosslinked polyester polymer is too high, the fixability is lowered. Since the effect of improving offset resistance does not appear, it is preferable that the crosslinked polyester polymer is 80 to 10% by weight based on 20 to 90% by weight of the polyester block copolymer. In the case of a resin composition for a full-color toner, Although the effect of improving the offset resistance is recognized by the inclusion of a small amount of the crosslinked polyester polymer, if the amount is too large, the fixing property is rather lowered, so that the content of the polyester block copolymer is 100 to 80% by weight. And preferably 0 to 20% by weight of a crosslinked polyester polymer.

The resin composition for a toner according to the present invention may be used within a range that can achieve the object of the present invention, with respect to a vinyl copolymer resin such as a styrene-acrylic resin and a polyester block copolymer such as an epoxy resin and a urethane resin. A resin other than the crosslinked polyester polymer may be contained. Incidentally, the vinyl copolymer may have a crosslinked structure.

The resin composition for a toner of the present invention may further contain an aliphatic amide, a bisaliphatic amide, a metal soap, paraffin and the like.

The method for producing the toner of the present invention is not particularly limited. Usually, a releasing agent, a coloring agent, a charge controlling agent, and if necessary, a magnetic powder for a magnetic toner, It is manufactured by dispersing and mixing hydrophobic silica or the like as an improving agent, kneading with hot melt, and then pulverizing. The release agent may be dispersed during the polymerization of the resin composition.

Examples of the release agent include olefin waxes such as polypropylene wax and polyethylene wax, and paraffin wax. As the coloring agent, for example, carbon black, aniline black, phthalocyanine blue, quinoline yellow,
Lamp black, rhodamine-B, quinacridone, etc., and usually 1 to 1 part by weight per 100 parts by weight of the resin composition.
0 parts by weight are added.

There are two types of charge control agents, one for positive charging and one for negative charging. As the positive charge control agent,
For example, a nigrosine dye, an ammonium salt, a pyridinium salt, azine and the like can be mentioned. As the negative charge control agent, for example, a chromium complex, an iron complex and the like can be mentioned. These charge control agents are usually added in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the resin composition.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

[Production of Resin Composition for Full-Color Toner] (Examples 1 and 2 and Comparative Examples 1 to 4) A 2-liter four-necked flask was equipped with a reflux condenser, a distillation column, a water separator, a nitrogen gas inlet tube, A thermometer and a stirrer were installed according to a conventional method.
In the composition shown in the above, dicarboxylic acids [phthalic anhydride
(PAn)], diols (1,4-cyclohexanedimethanol (CHDM) or ethylene glycol (EG)) and an esterification condensation catalyst (dibutyltin oxide (DBTO)), and at 200 ° C., water formed was distilled off. The esterification reaction was carried out while distilling out. The esterification reaction was terminated when water stopped distilling from the distillation column, and a polyester block A was obtained.

In another 2 liter four-necked flask, a polyester block B was obtained in the same manner with the composition shown in Table 2, and then the polyester block A obtained above was added and melt-mixed. Was removed and a vacuum pump was attached. The pressure inside the system was reduced to 5 mmHg or less, the free diol produced by the condensation reaction was distilled out of the system at 220 ° C. and a stirring rotation speed of 120 rpm, and the polyester block shown in Table 2 was removed. Polymer-was obtained.

(Comparative Example 5) A carboxylic acid, a diol and an esterification condensation catalyst were blended in the composition shown in Table 2.
Polycondensation was performed by the same reaction procedure as in Example 1 to obtain a polyester random copolymer.

[Production of Full-Color Toner] (Examples 1 and 2 and Comparative Examples 1 to 5) A full-color toner resin composition comprising the obtained polyester block copolymer and polyester random copolymer was used. After mixing and blending the following components, and melt-kneading at 150 ° C., pulverized to a particle size of about 10 μm with a jet mill,
This is made of hydrophobic silica (Nippon Aerosil Co., Ltd., trade name "R
972)) was added and mixed to obtain toners. Note that the resin compositions for full-color toner are assigned in the order of Examples 1 and 2 and Comparative Examples 1 to 5 in numerical order.

-100 parts by weight of a resin composition for full-color toner (-)-3 parts by weight of a charge control agent (trade name "TP-302", manufactured by Hodogaya Chemical Co., Ltd.)-Carbon black (trade name, manufactured by Mitsubishi Chemical Corporation) MA-100 ”) 6.0 parts by weight ・ Polypropylene wax (manufactured by Sanyo Chemical Co., Ltd., trade name“ Phiscall 660P ”) 4.0 parts by weight

Further, a full-color toner was prepared in the same manner as described above, except that disazo yellow was used for yellow, carmine 6B was used for magenta, and copper phthalocyanine was used for cyan instead of carbon black.

In order to evaluate the performance of the full-color toner resin compositions obtained in Examples 1 and 2 and Comparative Examples 1 to 5 and the performance of the full-color toner using the same, the following items were measured according to the following methods. The obtained results are shown in Tables 2 and 3, respectively.

(1) Fixability (Fixing temperature) 6.0 parts by weight of the obtained toner is mixed with 94.0 parts by weight of an iron powder carrier having a particle size of about 50 to 80 μm to prepare a developer, and electrophotographic copying is performed. A plurality of copies were made from the unfixed image using the developer. At the time of copying, the set temperature of the heat fixing roll of the electrophotographic copying machine was increased by 1 ° C., and the minimum fixing temperature was measured. The minimum fixing temperature is
The fixed image was rubbed with a sand eraser for a typewriter according to a conventional method, and the set temperature was gradually increased. The set temperature at which the density of the fixed image did not substantially change was defined as the fixing temperature.

The electrophotographic copying machine used was a modified version of "Acolor686" manufactured by Fuji Xerox Co., Ltd. for testing.

(2) Offset Resistance The set temperature of the heat fixing roll of the electrophotographic copying machine is set to 190 ° C., and the unfixed image is continuously copied using the same developer as that used in the previous section, and the toner is fixed. The occurrence of offset at the time was visually observed, and the case where no occurrence was observed was evaluated as “「 ”, and the case where offset was observed was evaluated as“ X ”.

(3) Fixing Surface Smoothness (Glossy) Continuous copying (set temperature of heat fixing roll: 190 ° C.) was performed in the same manner as in the offset resistance test described in the preceding section. The fixing surface smoothness was evaluated by measuring its gloss. The evaluation was “○” for gloss 50 or more, “△” for gloss 45 or more and less than 50, and gloss 4
Less than 5 was rated "x". The gloss was measured using a gloss meter manufactured by Gardner, Inc. (“Gloss Guard”, incident angle 60).
Degree).

(4) Image quality (presence / absence of fog) The unfixed image is continuously copied from the unfixed image at the fixing temperature obtained by the fixing property described in the first item, using the same developer as in the preceding item. The presence or absence of fogging of the fixed image was visually observed, and those without fog were evaluated as “○”, and those with fogging were evaluated as “x”.

(5) Storage Property After weighing 20 g of each of the obtained toners, sealing them in a 200 ml reagent bottle and storing them in a thermostat at 50 ° C. for 48 hours,
"Powder Tester PT-E" manufactured by Hosokawa Micron
Using a “type”, a sieve test was performed under the conditions of an amplitude of 1 mm and 10 seconds, and “○” indicates that the residual amount on the sieve having an aperture of 250 μm was 1 g or less, and “×” indicates that the residual amount exceeded 1 g. Was evaluated.

(6) Transparency At the fixing temperature obtained by the fixing property described in the above item 1, a sample is randomly drawn from a continuous copy of an unfixed image using the same developer as in the preceding item, and the sample is fixed. The color tone of the halftone portion was visually observed, and those that could reproduce the halftone were evaluated as “○”, those that could be reproduced, but slightly unsatisfactory were evaluated as “△”, and those that could not be reproduced were evaluated as “x”. .

[0050]

[Table 2]

[0051]

[Table 3]

As apparent from Table 3, Examples 1 and 2
Has good fixability even at low temperatures,
It is excellent in offset resistance and storage stability, does not generate fog, and has excellent transparency which is a factor of halftone reproducibility, and simply maintains a good balance of these properties It turns out that it is of high quality, not limited to being done. On the other hand, the toner of Comparative Example 4
Although good fixability is exhibited at low temperatures, offset resistance and storage stability are poor, and good image quality cannot be obtained due to fogging. The toners of Comparative Examples 1 and 3 have good fixability. It was not so good, and halftone reproduction was not so good. The toner of Comparative Example 2 had a slightly higher fixing temperature, but was barely used in Comparative Example 5 using a conventional polyester resin composed of a random copolymer as a binder.
Both toners had a passing score.

[Production of Resin Composition for Monochrome Toner] (Examples 3 and 4 and Comparative Examples 6 to 10) The same polycondensation apparatus as used in the preparation of the polyester block copolymer was used, and the results are shown in Table 4. Table 4
Dicarboxylic acids (terephthalic acid (TFA)), diols (ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), 1,3-propylene glycol (PG), neopentyl glycol (NP
G)] and a trivalent carboxylic acid [1,2,4-benzenetricarboxylic acid (anhydrous) :( TMA)] and an esterification condensation catalyst (same as in Example 1), and prepared in the same manner as the polyester block copolymer. Thus, a crosslinked polyester resin was prepared.
Table 4 also shows the flow softening point and glass transition point of the obtained crosslinked polyester resin.

[0054]

[Table 4]

The obtained polyester block copolymer and polyester random copolymer were charged into the obtained crosslinked polyester resin in accordance with the composition shown in Table 5, and the concentration of the resin composition was changed to Toluene was injected to a concentration of 40% by weight, and the mixture was melted and mixed under heating and stirring, and then the solvent was removed at normal pressure for 2 hours and reduced pressure for 1 hour to obtain a resin composition for a monochrome toner.

[Production of Monochrome Toner] (Examples 3, 4 and Comparative Examples 6 to 10) Using the obtained resin compositions for monochrome toner, the following components containing the same were mixed and melt-kneaded at 150 ° C. Thereafter, the mixture was pulverized with a jet mill to a particle size of about 10 μm, and 0.3% by weight of hydrophobic silica (trade name “R972” manufactured by Nippon Aerosil Co., Ltd.) was added and mixed to obtain toners.

-100 parts by weight of a resin composition for a monochrome toner-1.5 parts by weight of a chromium-containing dye (trade name "Phontron S-34" manufactured by Orient Chemical Co., Ltd.)-Carbon black (trade name manufactured by Mitsubishi Chemical Corporation) "MA-100") 6.5 parts by weight ・ Polypropylene wax (manufactured by Sanyo Chemical Co., Ltd., trade name "Phiscall 660P") 4.0 parts by weight

In order to evaluate the performance of the monochrome toner resin compositions obtained in Examples 3 and 4 and Comparative Examples 6 to 10 and the performance of the monochrome toner using the same, the following items were measured according to the following methods. The obtained results are shown in Tables 5 and 6, respectively.

(1) Fixing Property (Fixing Temperature) A developer was prepared by mixing 6.5 parts by weight of the obtained toner with 93.5 parts by weight of an iron powder carrier having a particle size of about 50 to 80 μm. The minimum fixing temperature was measured in the same manner as for the full-color toner except that the electrophotographic copying machine used in the test was modified from "7050" manufactured by Konica Corp. for the test. As a method for determining the minimum fixing temperature, a rubbing material was rubbed using a cotton pad instead of a sand eraser for a typewriter, and the fixing strength obtained by the following formula (1) was 8
The set temperature at which the value was 5% or more was defined as the fixing temperature. The image density in the formula (1) was measured using a reflection densitometer “RD-914” manufactured by Macbeth.

(2) Offset Resistance The surface temperature of the heat fixing roll of the electrophotographic copying machine is changed stepwise to both a high temperature portion and a low temperature portion to fix the toner image on the transfer paper having the unfixed image. And a copy was obtained. At the time of the transfer, there is occurrence of contamination by toner in the blank portion of the copy paper, the critical temperature of the high temperature portion and the low temperature portion is measured, and the temperature region where the contamination does not occur is set as the non-offset temperature region,
The width of this temperature region was defined as a non-offset temperature width.

(3) Preservation A sieving test was conducted in the same manner as for a full-color toner, and evaluated according to the same criteria.

(4) Image quality (presence or absence of fog) Observation was performed in the same manner as for a full-color toner, and evaluation was performed using the same criteria.

[0063]

[Table 5]

[0064]

[Table 6]

As is clear from Table 6, Examples 3 and 4
The toner has good fixability even at a low temperature, has excellent offset resistance and storage stability, does not cause fogging, and has a good balance of these properties and is of high quality. It turns out there is. On the other hand, Comparative Examples 6 to
Each of the toners of No. 10 shows a relatively high fixing temperature, and the toner of Comparative Example 9 has a low fixing temperature, but has poor image quality such as storability and generation of fog, and may not be usable. I understand.

[0066]

The resin composition for a toner according to the present invention is constituted as described above, so that a dye and a pigment of a colorant are firmly bound and a tough toner coating film is formed. It is a material that can be firmly applied to the surface and does not pulverize due to heat or mechanical friction to contaminate the surroundings and the copy paper, and does not unnecessarily contaminate the copy paper due to adhesiveness.

Since the toner of the present invention is constituted as described above, it has good fixability even at a low temperature.
It is excellent in offset resistance and storage stability, does not generate fog, has good halftone reproducibility, and not only maintains a good balance of these various properties, but also Is of high quality.

[Brief description of the drawings]

FIG. 1 is a flowchart for analyzing physical properties of a resin composition for a toner of the present invention.

Claims (6)

[Claims] A weight average molecular weight of 3 × 10 ^{3 to} 5 containing a polyester block obtained by condensing an aliphatic diol and a dicarboxylic acid and a polyester block obtained by condensing an alicyclic diol and a dicarboxylic acid. × 10
^4. A resin composition for toner, comprising the polyester block copolymer of ⁴ as a main component. 2. 10 to 55 mol% of a polyester block component obtained by condensing an aliphatic diol and a dicarboxylic acid.
2. The resin composition for a toner according to claim 1, comprising a polyester block copolymer containing a polyester block component obtained by condensing an alicyclic diol and a dicarboxylic acid with 90 to 45 mol%. 3. The resin composition for a toner according to claim 1, wherein the dicarboxylic acid contains phthalic anhydride. 4. The glass transition point is 50 ° C. or higher and the softening point is 130 ° C. or lower.
The resin composition for a toner according to any one of the above. 5. The resin composition for a toner according to claim 1, wherein bisphenol A is used as a diol component.
A resin composition for a toner, comprising a crosslinked polyester polymer containing no derivative. 6. A toner comprising the resin composition for a toner according to claim 1. Description: