JP6662075B2 - Wax composition for toner - Google Patents

Description

  The present invention relates to a wax composition for a toner that is suitably used for a toner used for developing an electrostatic charge formed by electrophotography in a copying machine, a facsimile, a printer, and the like. More specifically, the present invention relates to a wax composition for toner that can impart low-temperature fixability to a toner, has excellent dispersibility of a colorant contained in the toner, and can obtain an image with reduced gloss.

Toners used in electrophotographic printers, facsimiles, and electrophotographic devices such as copiers having these functions include, besides thermoplastic resin (binder resin) as a main component, a colorant (carbon black, magnetic powder, Pigment, etc.), a charge control agent, and a wax, and if necessary, a fluidity additive, a cleaning aid, and a transfer aid.
In the fixing step, the toner is softened by being heated by the fixing roll, and is fixed on the surface of the printing medium by receiving the pressure of the fixing roll to form an image. The toner wax contained in the toner has a function of releasing the toner from remaining on the fixing roll (filming) at the time of fixing, and has a function of improving the fixing property by promoting the softening of the thermoplastic resin. Have.

In recent years, the performance required for electrophotographic apparatuses such as printers, facsimile machines, and copiers has been advanced, and in addition to the improvement of the apparatuses, the toner used in these apparatuses is also required to have higher functions. For example, in order to reduce power consumption due to increasing awareness of environmental issues, toners suitable for low-temperature fixing have been demanded, and waxes having a transparent melting point of 60 to 75 ° C. are generally used. Further, as the demand for higher image quality increases, there is a demand for a toner that exhibits advanced image characteristics such as suppressing the gloss of the printing surface. Furthermore, with increasing awareness of environmental issues, it is required to suppress the emission of ultra-fine particles (UFP), which are volatile factors, to the external environment. Factors of UFP include low molecular components in toner and low molecular siloxane in silicone rubber used as an elastic layer such as a heating roller.
In such a situation, in order to solve the above-mentioned problems of the toner, there is a demand for a wax capable of exhibiting releasability at a low temperature and improving fixability and a wax capable of improving volatility resistance.

  Patent Literature 1 discloses a method of using a natural wax such as carnauba wax or rice wax as a mold release agent as a method of expressing low-temperature fixability. When these waxes are used, low-temperature fixability can be exhibited, but the releasability is insufficient and offset resistance may not be sufficiently exhibited in some cases. Further, these natural waxes have a brownish property, which may cause a problem in color reproducibility in color printing. In addition, since natural wax contains low molecular weight components such as free fatty acids and free alcohols, there may be a problem in terms of the volatility resistance of the toner.

  Patent Document 2 discloses a monoester wax having a specific complex viscosity. Although the monoester wax having this complex viscosity has good fixability, the obtained ester wax is remarkable because the reaction is performed at a high temperature of 240 ° C. using sulfuric acid as a catalyst when synthesizing the monoester wax. Coloration, which may cause problems in color reproducibility and colorant dispersibility during color printing.

Patent Document 3 discloses that a toner using an ester wax having 5 or more ester bonds in a molecule, having a molecular weight of 2,000 or more, and a dissolution amount of 5 g or more in 100 g of styrene measured at 35 ° C., has a low-temperature fixing property and It is disclosed that storage stability and durability of print image quality are excellent. However, when this wax is used for a monochrome toner, it may be difficult to obtain an image with reduced gloss, which is preferred in monochrome printing. Further, when used in combination with a binder resin which functions at a low temperature and is intended for low-temperature fixing in recent years, the image quality may be deteriorated depending on the compatibility with the binder resin.
As described above, there has been a demand for a toner wax composition having low-temperature fixability, which is excellent in dispersibility of a colorant and volatility, and which can provide an image with further reduced gloss.

JP-A-4-362953 JP 2013-015673 A JP 2001-147550 A

  An object of the present invention is to provide a wax composition for a toner that can impart low-temperature fixability to a toner, is excellent in dispersibility of a colorant and volatility, and can obtain an image with reduced gloss. And

  The present inventors have conducted intensive studies in order to solve the above problems, and as a result, have found that a composition in which a specific fatty acid ester wax and a sulfonic acid ester wax are used in a specific mass ratio is used as a toner wax. By this, the dispersibility and volatility of the colorant can be improved, and the gloss of the wax composition can be suppressed low, so that when a toner is printed on a print medium such as paper, the gloss of the image can be suppressed low. I found what I could do.

（式中、Ｒ^１は炭素数１〜５のアルキル基または炭素数６〜１５の芳香族基、Ｒ^２は炭素数１６〜２４のアルキル基を表す。） That is, the wax composition for a toner of the present invention comprises a fatty acid ester wax (a) of a linear saturated monocarboxylic acid having 16 to 24 carbon atoms and a linear saturated monoalcohol having 16 to 24 carbon atoms; Wherein the content of the sulfonic acid ester wax (b) is 0.001 to 1 part by mass with respect to 100 parts by mass of the fatty acid ester wax (a). It is.

(In the formula, R ¹ represents an alkyl group having 1 to 5 carbon atoms or an aromatic group having 6 to 15 carbon atoms, and R ² represents an alkyl group having 16 to 24 carbon atoms.)

  By mixing the toner wax composition of the present invention with the toner, it is possible to impart low-temperature fixability to the toner, and to have excellent dispersibility of the colorant contained in the toner and excellent volatility resistance, Further, it is possible to provide a toner capable of obtaining an image with reduced gloss.

Hereinafter, embodiments of the present invention will be described.
The wax composition for a toner of the present invention contains a fatty acid ester wax (a) and a sulfonic acid ester wax (b). Hereinafter, each component will be described.

[Fatty acid ester wax (a)]
The fatty acid ester wax (a) comprises at least one straight-chain saturated monocarboxylic acid selected from straight-chain saturated monocarboxylic acids having 16 to 24 carbon atoms and a straight-chain saturated monocarboxylic acid having 16 to 24 carbon atoms. Fatty acid ester waxes obtained from at least one linear saturated monoalcohol selected from monoalcohols.

The starting carboxylic acid of the fatty acid ester wax (a) is a linear saturated monocarboxylic acid having 16 to 24, preferably 16 to 22 carbon atoms. If the carbon number of the starting carboxylic acid is too small, the wax melts at a low temperature, and the stability of the toner during high-temperature storage may be significantly reduced. On the other hand, if the carbon number is too large, the wax cannot quickly exude at the time of fixing, and the releasability may be reduced particularly in high-speed printing. In addition, winding and low-temperature offset easily occur in a printed image.
Specific examples of the raw material carboxylic acid include, for example, palmitic acid, heptadecanoic acid, stearic acid, nonadecanoic acid, arachiic acid, heneicosanoic acid, behenic acid, tricosanoic acid, tetracosanoic acid and the like. Among these, behenic acid is particularly preferred.

The raw material alcohol for the fatty acid ester wax (a) is a linear saturated monoalcohol having 16 to 24 carbon atoms, preferably 16 to 22 carbon atoms. If the carbon number of the starting alcohol is too small, the wax melts at a low temperature, and the stability of the toner during high-temperature storage may be significantly reduced. On the other hand, if the carbon number is too large, the wax cannot quickly exude at the time of fixing, and the fixability and the releasability may be reduced particularly in high-speed printing. In addition, winding and low-temperature offset easily occur in a printed image.
Specific examples of the raw material alcohol include, for example, palmityl alcohol, heptadecanol, stearyl alcohol, nonadecanol, arachi alcohol, heneicosanol, behenyl alcohol, tricosanorchol, tetracosanol and the like. Of these, behenyl alcohol is particularly preferred.

  The fatty acid ester wax (a) obtained from the straight-chain saturated monocarboxylic acid and the straight-chain saturated monoalcohol preferably has a total carbon number of 34 to 46, particularly preferably a total carbon number of 36 to 44. is there.

  As the fatty acid ester wax (a), among the fatty acid ester waxes obtained from the raw material carboxylic acid and the raw material alcohol, a fatty acid ester wax composed of behenic acid and behenyl alcohol is preferable.

The fatty acid ester wax (a) preferably has an acid value of 3 mgKOH / g or less, particularly preferably 1 mgKOH / g or less. When the acid value is 3 mgKOH / g or less, the toner containing the wax composition of the present invention is more preferable in terms of chargeability, blocking resistance and storage stability. The lower limit of the acid value of the fatty acid ester wax (a) is usually 0.01 mgKOH / g.
Further, the fatty acid ester wax (a) preferably has a hydroxyl value of 5 mgKOH / g or less, particularly preferably 4 mgKOH / g or less. When the hydroxyl value is 5 mgKOH / g or less, the volatility of the toner containing the wax composition of the present invention is further improved, which is preferable. The lower limit of the hydroxyl value of the fatty acid ester wax (a) is usually 0.1 mgKOH / g.
The acid value can be measured according to JOCS (Japan Oil Chemists 'Society) 2.3.1-1996, and the hydroxyl value can be measured according to JOCS (Japan Oil Chemists' Society) 2.3.6.2-1996. it can.

The fatty acid ester wax (a) preferably has a transparent melting point of 55 to 80 ° C, particularly preferably 60 to 76 ° C.
The transparent melting point can be measured according to JOCS (Japan Oil Chemists' Society) 2.2.4.1.

[Sulfonate ester wax (b)]
The sulfonic acid ester wax (b) is a compound represented by the formula (1).

R ¹ is an alkyl group having 1 to 5 carbon atoms or an aromatic group having 6 to 15 carbon atoms.
Examples of the alkyl group having 1 to 5 carbon atoms include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, an isobutyl group, a tert-butyl group, and a neopentyl group. Can be Among them, an alkyl group having 1 to 3 carbon atoms is preferable, and a methyl group having 1 carbon atom is particularly preferable.
Examples of the aromatic group having 6 to 15 carbon atoms include a benzene-based aromatic group, a heteroaromatic group, a non-benzene-based aromatic group, and a condensed-ring aromatic group, and these may have an alkyl group. . Among them, those having an aromatic group having 7 to 10 carbon atoms are preferable, and those having an aromatic group having 7 to 8 carbon atoms are particularly preferable. An aromatic group having an alkyl side chain in a phenyl group which is an aromatic group having 6 carbon atoms is more preferable, and a methylphenyl group which is a phenyl group having a methyl group having 1 carbon atom in the side chain is more preferable. The position of the methyl group in the methylphenyl group may be any of the o-position, m-position and p-position, but a p-methylphenyl group is most preferred.

R ² is an alkyl group having 16 to 24 carbon atoms, preferably an alkyl group having 18 to 22 carbon atoms, and particularly preferably a straight-chain alkyl group such as a stearyl group, an eicosyl group, and a behenyl group.

  Representative examples of the sulfonate ester wax (b) include, for example, hexadecyl p-toluenesulfonate, stearyl p-toluenesulfonate, arachidyl p-toluenesulfonate, behenyl p-toluenesulfonate, hexadecyl p-octylbenzenesulfonate And stearyl p-octylbenzenesulfonate, arachidyl p-octylbenzenesulfonate, behenyl p-octylbenzenesulfonate, hexadecyl methanesulfonate, stearyl methanesulfonate, arachidyl methanesulfonate, and behenyl methanesulfonate. Preferably, stearyl p-toluenesulfonate, behenyl p-toluenesulfonate, stearyl methanesulfonate, and behenyl methanesulfonate are exemplified.

The sulfonic acid ester wax (b) preferably has an acid value of 10 mgKOH / g or less, particularly preferably 7 mgKOH / g or less. When the acid value is 10 mgKOH / g or less, the toner containing the wax composition of the present invention is more favorable in chargeability, blocking resistance or storage stability, which is preferable. The lower limit of the acid value of the sulfonic acid ester wax (b) is usually 0.01 mgKOH / g.
Further, the sulfonic acid ester wax (b) preferably has a hydroxyl value of 10 mgKOH / g or less, particularly preferably 7 mgKOH / g or less. When the hydroxyl value is 10 mgKOH / g or less, the volatility of the toner containing the wax composition of the present invention is further improved, which is preferable. In addition, the lower limit of the hydroxyl value of the sulfonic acid ester wax (b) is usually 0.1 mgKOH / g.
The acid value can be measured according to JOCS (Japan Oil Chemists 'Society) 2.3.1-1996, and the hydroxyl value can be measured according to JOCS (Japan Oil Chemists' Society) 2.3.6.2-1996. it can.

The sulfonic acid ester wax (b) preferably has a transparent melting point of 50 to 75 ° C, particularly preferably 55 to 70 ° C.
The transparent melting point can be measured according to JOCS (Japan Oil Chemists' Society) 2.2.4.1.

(Wax composition for toner)
In the wax composition for a toner of the present invention, the content of the sulfonic acid ester wax (b) is 0.001 to 1 part by mass, preferably 0.001 to 0.5 part by mass, per 100 parts by mass of the fatty acid ester wax (a). Parts by weight. If the content of the sulfonic acid ester wax (b) is too small, the dispersibility of the colorant and the gloss of the image may be reduced. On the other hand, when the content of the sulfonic acid ester wax (b) is too large, the hue of the obtained wax composition is deteriorated, and the print quality is adversely affected. Further, since the sulfonate ester wax (b) has a lower molecular weight than the fatty acid ester wax (a), the volatility of the wax composition may be reduced.
In a more preferred embodiment, the alkyl group of the linear saturated monoalcohol having 16 to 24 carbon atoms constituting the fatty acid ester wax (a) and R2 in the formula (1) constituting the sulfonic acid ester wax (b) are represented by the following formula: The same wax composition for toner may be used.
The fatty acid ester wax (a) and the sulfonic acid ester wax (b) may be used alone or in combination of two or more.

As described above, the ester wax obtained by mixing the above-mentioned fatty acid ester wax (a) and the sulfonic acid ester wax (b) at a fixed ratio can suppress gloss. This mechanism is considered as follows.
The wax heated by the hot roll at the time of fixing is melted in the binder resin to be in a liquid state, and quickly oozes out on the toner surface, thereby giving good releasability from the hot roll. When the wax oozing on the toner surface solidifies, the combination of the fatty acid ester wax (a) and the sulfonic acid ester wax (b) affects the crystallinity and crystallization behavior of the fatty acid ester wax (a). This is presumed to reduce the gloss of the image.
Further, since the sulfonic acid ester wax (b) has a highly polar aromatic group or a sulfonic acid group, it has a high affinity for the colorant and can contribute to the dispersibility of the colorant in the binder resin. it can.

The toner wax composition of the present invention can be produced by a known method. For example, the fatty acid ester wax (a) and the sulfonic acid monoester wax (b) may be synthesized and then blended to produce a wax for toner. Also, the amounts of the fatty acid, the sulfonic acid compound, and the aliphatic alcohol may be adjusted so as to have a prescribed ratio, and the production may be performed by batch synthesis.
The method for producing a wax composition for a toner by synthesizing the fatty acid ester wax (a) and the sulfonic acid ester wax (b) after synthesizing the fatty acid ester wax (a) and the sulfonic acid ester wax (b) is described below. It is preferable to perform cooling, atomization, and the like after the above heating and uniform mixing from the viewpoint of quality variation.
According to the wax composition for a toner of the present invention thus obtained, it is possible to impart low-temperature fixability to the toner and to achieve high image quality by dispersing the colorant well. Further, an image with reduced gloss can be obtained.

  The wax composition for a toner of the present invention is blended together with a binder resin, a colorant, a charge control agent, and the like, and a toner is manufactured by an ordinary manufacturing method. The compounding amount of the wax composition for a toner of the present invention in the toner is usually 1 to 10 parts by mass with respect to 100 parts by mass of the binder resin. In the toner, the wax composition for a toner of the present invention is used alone or as a mixture of two or more kinds.

  Hereinafter, the present invention will be described in more detail by showing production examples of the toner wax composition of the present invention and evaluation methods thereof.

[I. Fatty acid ester wax (A-1) to (A-3)]
The fatty acid ester waxes (A-1) to (A-3) are fatty acid ester waxes obtained by esterifying a linear saturated monocarboxylic acid and a linear saturated monoalcohol, and the linear saturated monocarboxylic acid used as a raw material Table 1 shows the composition, straight-chain saturated monoalcohol composition, acid value, hydroxyl value, transparent melting point and hue of the obtained ester wax.

[I-1. Production of fatty acid ester wax (A-1)]
500 g of alcohol (behenyl alcohol) and 545 g of carboxylic acid (behenic acid) represented by ester number A-1 in Table 1 in a four-necked flask equipped with a thermometer, a nitrogen inlet tube, a stirring blade, and a cooling tube (per mole of alcohol) 1.05 mol of a fatty acid) and reacted at 240 ° C. for 14 hours under a nitrogen stream. The obtained fatty acid esterified crude product was 980 g. To this fatty acid esterified crude product, 204 g of toluene and 40 g of ethanol (20 parts by mass of a hydrocarbon solvent and 4 parts by mass of an alcohol solvent for separation with respect to 100 parts by mass of the crude fatty acid esterified product) were added. An aqueous potassium hydroxide solution containing potassium hydroxide in an amount equivalent to 1.5 times the acid value of the esterified crude product was added, and the mixture was stirred at 70 ° C. for 30 minutes. The aqueous layer was separated and removed by standing for 30 minutes. Washing with water was repeated four times until the pH of the waste water became neutral. The solvent was distilled off from the remaining ester layer at 180 ° C. under a reduced pressure of 1 kPa, followed by filtration to obtain 950 g of a fatty acid ester wax (A-1). Table 1 shows the acid value, hydroxyl value, transparent melting point and hue of the obtained fatty acid ester wax.

[I-2. Production of fatty acid ester waxes (A-2) and (A-3)]
Fatty acid ester waxes (A-2) and (A-3) were obtained in the same manner as in the production example of the fatty acid ester wax (A-1) except that the carboxylic acid and the alcohol were replaced with the components shown in Table 1. Was. Table 1 shows the raw material composition, acid value, hydroxyl value, transparent melting point and hue of the obtained fatty acid ester waxes (A-2) and (A-3).

[II. Sulfonate ester waxes (B-1) to (B-3)]
The sulfonic acid ester waxes (B-1) to (B-3) are sulfonic acid ester waxes obtained by esterifying a sulfonic acid compound and a linear saturated monoalcohol. Table 2 shows the alcohol composition, the acid value, the hydroxyl value, the transparent melting point, and the hue of the obtained sulfonic acid ester wax of the formula (1).

R ¹ represents an alkyl group having 1 to 5 carbon atoms or an aromatic group having 6 to 15 carbon atoms, and R ² represents an alkyl group having 16 to 24 carbon atoms.

[II-1. Production of sulfonic acid ester wax (B-1)]
In a four-necked flask equipped with a thermometer, a nitrogen introducing tube, a stirring blade and a cooling tube, 700 g of alcohol (behenyl alcohol) having R ² (behenyl group) shown in ester number B-1 in Table 1 and R ¹ (p- 388 g of sulfonic acid having a methylphenyl group (p-toluenesulfonic acid) (1.05 mol of sulfonic acid per mol of alcohol) was added, and the mixture was reacted at 180 ° C. for 5 hours under a nitrogen stream. The obtained sulfonic acid esterified crude product was 1020 g. To this sulfonic acid esterified crude product, 130 g of toluene and 32 g of ethanol (20 parts by mass of a hydrocarbon solvent and 4 parts by mass of an alcoholic solvent for separation, with respect to 100 parts by mass of the crude product of fatty acid esterification) were added. An aqueous solution of potassium hydroxide containing potassium hydroxide in an amount equivalent to 1.03 equivalents of the acid value of the sulfonic acid esterified crude product was added, and the mixture was stirred at 70 ° C. for 30 minutes. The aqueous layer was separated and removed by standing for 30 minutes. Washing with water was repeated four times until the pH of the waste water became neutral. The solvent was distilled off from the remaining ester layer at 180 ° C. under a reduced pressure of 1 kPa, followed by filtration to obtain 980 g of a sulfonate ester wax (B-1). Table 2 shows the acid value, hydroxyl value, transparent melting point and hue of the obtained sulfonic acid ester wax.

[II-2. Production of sulfonic acid ester waxes (B-2) and (B-3)]
Alcohol instead of alcohol having an R ² as described in Table 2, further, except that the toluene n- octyl benzene for (B-3) is in the sulfonic acid ester wax (B-1) and the same method Sulfonate ester waxes (B-2) and (B-3) were obtained. Table 2 shows the raw material composition, acid value, hydroxyl value, transparent melting point, and hue of the obtained sulfonic acid ester waxes (B-2) and (B-3).

[III. Wax composition for toner)
The toner wax compositions (C-1) to (C-12) were prepared with the compositions shown in Table 3, and the hue, gloss, volatility and colorant dispersibility of the obtained toner wax composition were measured. The results are shown in Table 3.

[III-1. Preparation of wax composition for toner (C-1)]
In a four-necked flask equipped with a thermometer, a nitrogen inlet tube, a stirring blade and a cooling tube, 1,000 g of the fatty acid ester wax (A-1) and 0.03 g of the sulfonic acid ester wax (B-1) (the fatty acid ester wax (A -1) 0.003 parts by mass per 100 parts by mass), and were heated and melted at 100 ° C. under nitrogen, and heated and stirred for 30 minutes so that the contents became uniform. 10 g of this mixture was poured into a handleable aluminum case (No. 3) manufactured by As One Corporation, and allowed to cool at room temperature to solidify the wax, thereby obtaining a wax composition (C-1). A sample was taken out of the aluminum case, and the glossiness of the portion that was in contact with the aluminum case and became smooth was measured using a gloss meter. Table 3 shows the results.

[III-2. Preparation of wax compositions (C-2) to (C-12) for toner]
The toner wax compositions (C-2) to (C-12) were prepared in the same manner as the toner wax composition (C-1) with the compositions shown in Table 3, and the resulting toner wax was obtained. Table 3 shows the hue, gloss, volatility and colorant dispersibility of the composition.

(Evaluation method of fatty acid ester wax and sulfonic acid ester wax)
(1) Acid value of fatty acid ester wax and sulfonic acid ester wax; in accordance with JOCS (Japan Oil Chemists' Society) 2.3.1-96.
(2) Hydroxyl value of fatty acid ester wax and sulfonic acid ester wax; in accordance with JOCS (Japan Oil Chemists' Society) 2.3.6.39-96.
(3) Transparent melting point of fatty acid ester wax and sulfonic acid ester wax; based on JOCS (Japan Oil Chemists' Society) 2.2.4.1.
(4) Hue of fatty acid ester wax and sulfonic acid ester wax; compliant with JOCS (Japan Oil Chemists' Society) 2.2.1.3.
(5) Hue of wax composition: JOCS (Japan Oil Chemists' Society) 2.3.2.1.
(6) Glossiness of Wax Composition Glossiness was measured at an angle of 60 ° using a VC-21-D3 digital portable gloss meter manufactured by Nippon Denshoku Industries Co., Ltd.
(7) Volatility resistance of wax composition "EXSTAR6000" manufactured by Seiko Instruments Inc. was used as a thermogravimetric analyzer (TG / DTA). The measurement is performed by placing about 10 mg of the wax compositions (C-1) to (C-12) in an aluminum sample holder, using an empty sample holder as a reference material, and under a nitrogen atmosphere (200 ml / min). The temperature was raised from 30 ° C. to 200 ° C. at 10 ° C./min, and the weight loss (%) after reading at 200 ° C. for 5 hours was read.

(Evaluation of dispersibility of colorant using toner wax composition)
5 g of the wax composition for toner, 80 g of polyester resin for toner, colorant (Pigment Red; Permanent Rubin L6B05 manufactured by Clariant), and 1 g of aluminum salicylate were thoroughly mixed with a Henschel mixer, and then mixed with a Labo Plastomill (Toyo Seiki Co., Ltd.). Kneading at a temperature of 130 to 140 ° C. The dispersion state of the kneaded material was evaluated according to the following criteria. The kneaded material was formed into a slide glass and observed with an optical microscope (magnification: X200). Table 3 shows the results.
：: Pigment particles are uniformly dispersed without aggregation.
Δ: Slight aggregation was observed.
×: Agglomeration is observed.

As shown in Table 3, each of the toner wax compositions (C-1) to (C-7) of Examples 1 to 7 has a low wax hue and a low gloss. When the composition is used as a toner wax, the gloss of the wax present on the surface of the image formed after fixing the toner is suppressed, and the gloss of the image can be suppressed to a low level. In addition, the volatility can be improved.
Furthermore, as shown in Table 3, these compositions have a highly polar aromatic group and a sulfonic acid group, and have a high affinity for the colorant, indicating that the dispersibility of the colorant is high. When these compositions are used as toner wax, the colorant is highly dispersed in the binder resin, which can contribute to high image quality.

On the other hand, Comparative Example 1 does not contain the sulfonic acid ester wax, and Comparative Example 2 has a remarkably low content of the sulfonic acid ester wax, so that the colorant dispersibility is low. Further, in Comparative Examples 3, 4, and 5, since the sulfonic acid ester wax content was large, a result was obtained in which the hue was high and the volatility was reduced.

Claims (1)

A fatty acid ester wax (a) of a linear saturated monocarboxylic acid having 16 to 24 carbon atoms and a linear saturated monoalcohol having 16 to 24 carbon atoms, and a sulfonic acid ester wax (b) represented by the formula (1): A wax composition for toner, wherein the content of the sulfonic acid ester wax (b) is 0.001 to 1 part by mass with respect to 100 parts by mass of the fatty acid ester wax (a).

(In the formula, R ¹ represents an alkyl group having 1 to 5 carbon atoms or an aromatic group having 6 to 15 carbon atoms, and R ² represents an alkyl group having 16 to 24 carbon atoms.)