JPH0844113A - Toner for developing electrostatic charge image and its production - Google Patents

Abstract

(57) [Summary] [Object] To provide a toner for developing an electrostatic charge image, which is excellent in low-temperature fixability and is excellent in offset prevention effect and suitable for a contact heating system. In a toner for developing an electrostatic charge image, which comprises at least a polyester resin as a main component and comprises a binder resin and a colorant, a wax which is incompatible with the resin is uniformly dispersed in the polyester resin in an amount of 5 μm or less. A toner for developing an electrostatic image containing fine particles and a method for producing the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic charge image developing toner used in electrophotography, electrostatic recording, electrostatic printing and the like, and a method for producing the same.

[0002]

2. Description of the Related Art An electrostatic charge image formed on an electrostatic charge image support in an electrophotographic method, an electrostatic recording method, an electrostatic printing method, etc., uses toner particles in which a colorant is dispersed in a binder resin. To be visualized. This visualized image is fixed as it is on the electrostatic image support, or is transferred to another support and then fixed. Therefore, the characteristics required for toner are
Not only developability but also good transferability and fixability are included. In particular, in recent years, low energy fixing has been strongly required from the viewpoint of energy saving. As the heat fixing method, there are a non-contact heating method such as oven fixing and a contact heat fixing method such as heat roller fixing. The contact heating fixing method has high thermal efficiency, does not require a large amount of power for the fixing section, and can be downsized, and is a method that is in line with the times from the viewpoint of energy saving. But,
This method has a problem that an offset occurs. Offset is a phenomenon in which a part of the toner forming an image at the time of fixing is transferred to the surface of the heating roller and is transferred onto the next support to be fed to contaminate the image. To prevent this offset phenomenon, various proposals have been made and put into practical use.

For example, it has been widely practiced to prevent the offset phenomenon by incorporating a compound having releasability such as wax into the toner. However, in the present method, since wax is added during melt-kneading, if the melt viscosity of the wax and the resin are too different, it is difficult to uniformly disperse the wax in the resin as fine particles. When a wax having a good compatibility with the resin is used, the glass transition temperature and the like are lowered, which adversely affects the storability as a toner. In addition, the method of adding the wax at the time of kneading has a defect that the particle size of the wax becomes non-uniform, so that the developability is deteriorated due to the presence of particles having unstable charging. Further, as another offset prevention measure, it has been proposed to use a high molecular weight polymer as a binder resin constituting the toner, but not only is low temperature fixing difficult due to the high softening point, but also the resin It was tough and had problems such as difficulty in pulverization during toner production.

In order to improve these drawbacks, it has been proposed to use a polymer having a wide molecular weight distribution from a low molecular weight to a high molecular weight in a toner using a vinyl resin such as styrene. This toner is satisfactory to some extent in offset prevention and fixability, but is not satisfactory in fixability at low temperatures.

On the other hand, a condensed resin represented by a polyester resin has a relatively low molecular weight, so that a toner capable of fixing at a low temperature can be produced by using it, but its hot offset resistance is insufficient. . Therefore, in order to solve these problems, there is also a toner using a mixture of a high molecular weight vinyl resin and a low molecular weight polyester resin, which incorporates the characteristics of such a vinyl resin and a condensation resin. 114245, JP-A-58-11955.
And Japanese Patent Application Laid-Open No. 58-14147.
Although the hot offset resistance has some effect, a new problem arises in that the triboelectrification tends to be non-uniform because the resin cannot be uniformly mixed.

Further, a resin having a crosslinked structure using a trivalent or higher alcohol and / or a trivalent or higher carboxylic acid as a monomer component of a polyester resin is used as a toner resin to prevent offset. JP-A-54-86342, JP-A-56-1952, JP-A-56-21136, JP-A-56-168660, JP-A-57-37353, JP-A-58-14146,
JP-A-59-30542, JP-A-61-105561
JP-A-61-105563, JP-A-61-124
961 and JP-A-61-275769.

However, even in toners using these resins, if the amount of the polyhydric alcohol or carboxylic acid added is 30 mol% or less, the crosslinking reaction is not sufficiently carried out and the offset preventing effect is insufficient. Although it has the effect of preventing offset, it has drawbacks such that unreacted alcoholic hydroxyl groups and carbonyl groups of carboxylic acids are likely to remain, and the moisture resistance of the toner is significantly reduced.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in conventional toners and to provide a toner for developing an electrostatic charge image which is excellent in developability and fixability. It is an object of the present invention to provide a manufacturing method for easily obtaining such an electrostatic image developing toner.

[0009]

In order to solve the above-mentioned problems in the prior art, the present invention provides a binder resin,
It has been found that this can be achieved by using a polyester resin and blending a wax during the production of the polyester resin. More details are as follows.

The present invention is characterized in that in the toner for developing an electrostatic charge image containing a binder resin and a colorant as main components, a particulate wax of 5 μm or less is dispersed in the polyester resin as the binder resin. It is a toner for developing an electrostatic image, and it is preferable that the fine particle wax having a particle size of 5 μm or less is contained in an amount of 1 to 20% by weight based on the polyester resin.
Further, in the present invention, a polyester resin is used as the binder resin, A: diol component, B: dicarboxylic acid or its acid anhydride or lower alkyl ester component thereof, C: 3
A + B + C, A + B + C + D, when a polyhydric alcohol component having an acid or higher and a polyhydric carboxylic acid having a valency of 3 or higher, or an acid anhydride thereof or a lower alkyl ester component thereof are used.
A toner for developing an electrostatic image using a polyester resin obtained by polycondensation by any combination of A + B + D is preferable.

Further, in the invention of the production method of the present invention, when a polyester resin is produced by polycondensing an acid component and an alcohol component, the reaction is carried out in the presence of a wax which is incompatible with the produced polyester resin. And a step of producing a polyester resin in which the wax is finely dispersed, and a step of adding at least a colorant to the wax-dispersed polyester resin obtained in the above step, hot-melt kneading, and then pulverizing. And a method for producing a toner for developing an electrostatic image. As an acid component and an alcohol component for synthesizing the polyester resin used in the present invention, A: a diol component, B: a dicarboxylic acid or its acid anhydride or a lower alkyl ester component thereof, C: a polyhydric alcohol component having 3 or more valences, D : A + when a trivalent or higher polyvalent carboxylic acid or its acid anhydride or its lower alkyl ester component is used.
A method for producing an electrostatic charge image developing toner, which is based on any combination of B + C, A + B + C + D, and A + B + D, is preferable.

Materials used in the present invention will be described below. The wax used in the present invention is preferably incompatible with the polyester resin which is the main component. In this case, when the wax is melt-mixed with the resin and then cooled to room temperature, the amount of the wax added so as not to reduce the transparency of the resin is 1% by weight or less, which is defined as an incompatible range. The amount of the wax added is preferably 1 to 20% by weight based on the polyester resin. More preferably 2
It is 10% by weight. Since waxes are required to have a low melting point, examples of synthetic waxes include low molecular weight, low density polyethylene and polypropylene waxes, Fischer-Tropsch waxes, and the like. Among petroleum-based waxes, paraffin wax and micro waxes. And Petrotam. Other waxes include natural waxes such as carnauba wax, rice wax and candelilla wax, and oil-based synthetic waxes, but these waxes are compatible with polyester resin and lower the glass transition temperature as a toner. And the like, which adversely affects the storage stability and fluidity of the electrostatic charge image developing toner, which is not desirable.

Next, the components constituting the polyester resin will be described in detail. As the diol component, diethanolamine, ethylene glycol, diethylene glycol, propylene glycol, isoprene glycol, octane diol, 2,2-diethyl-1,3-propane diol, spiro glycol, neopentyl glycol, 1,
3-butanediol, 1,4-butanediol, 2-butyl-2-ethyl-1,3-propanediol, 1,6
-Hexanediol, hexylene glycol, 1,5-
Pentanediol, 3-methyl-1,5-pentanediol, hydrobenzoin, bis (β-hydroxyethyl) terephthalate, bis (hydroxybutyl) terephthalate, polyoxyethylenated bisphenol A, polyoxypropyleneated bisphenol A, polyoxyethylene Biphenol, polyoxypropylene biphenol, and the like.

As the dicarboxylic acid, fumaric acid,
Maleic acid, succinic acid, itaconic acid, mesaconic acid, citraconic acid, glutaconic acid, phthalic acid, isophthalic acid,
Terephthalic acid, cyclohexanedicarboxylic acid, cyclohexenedicarboxylic acid, adipic acid, sebacic acid, dodecanedioic acid, naphthalenedicarboxylic acid, biphenyl-4,
4'-dicarboxylic acid, 2,3-piperazine dicarboxylic acid, iminodicarboxylic acid, imidazole-4,5-dicarboxylic acid, piperidine dicarboxylic acid, pyrazole dicarboxylic acid, N-methylpyrazole dicarboxylic acid, N-phenylpyrazole dicarboxylic acid , Pyridinedicarboxylic acid, carbazole-3,6-dicarboxylic acid, 9-methylcarbazole-3,6-dicarboxylic acid, carbazole-
Examples thereof include 3,6-dibutyric acid, carbazole-3,6-γ, γ′-diketobutyric acid and lower alkyl esters thereof.

The trivalent or higher polycarboxylic acids include trimellitic acid, pyromellitic acid, 1,2,4-cyclohexanetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid and 2,5,7-. Naphthalene tricarboxylic acid, pyridine tricarboxylic acid, pyridine-2,3,4
Examples thereof include 6-tetracarboxylic acid, 1,2,7,8-tetracarboxylic acid and acid anhydrides thereof.

Examples of the trihydric or higher polyhydric alcohol include glycerin, trimethylolpropane, trimethylolethane, triethanolamine, pentaerythritol, sorbitol, glycerol and 1,3,5-trihydroxymethylbenzene. Can be done. In addition, the lower alkyl ester in the present invention means an alkyl having 1 to 6 carbon atoms.

The method for producing the polyester resin constituting the present invention is, for example, a diol component (A), a dicarboxylic acid component or its acid anhydride or its lower alkyl ester (B), and a polyhydric alcohol having a valence of 3 or more (C). ) And wax are put in a four-necked round bottom flask equipped with a stirrer, a condenser and a nitrogen gas introduction tube, and heated to 180 to 220 ° C. while introducing nitrogen gas to cause an esterification reaction.
After the distillation of water and methanol by the esterification reaction is completed, the temperature is raised to 200 to 240 ° C. over 30 to 1 hour, the pressure in the reaction system is reduced to 10 mmHg or less, and the reaction is performed for 2 to 4 hours, followed by fine wax dispersion. Obtain a polyester resin. The polyester resin used in the present invention is a differential scanning calorimeter (DS).
The glass transition temperature measured in C) is preferably 50 ° C. or higher, more preferably 50-80 ° C., and the flow softening point measured by a Koka type flow tester is preferably 80-1.
The temperature is 50 ° C, more preferably 80 to 130 ° C.

A method of measuring the flow softening point by a Koka type flow tester (Komaka type flow tester CFT-500C manufactured by Shimadzu Corporation) will be described below. Place the resin pellets in a cylinder preheated to about 50 ° C. with an area of approximately 1 cm ² . A nozzle having a diameter of 1 mm and a length of 1 mm is provided at the bottom of this cylinder. A plunger with an area of 1 cm ² applied with a load of 20 KgF is set on top of the resin pellet. The resin pellets in the cylinder are heated at a temperature rising rate of 6 ° C./min, and the softened resin is discharged from the nozzle. From the start point of the descent of the plunger, the temperature at the time when the plunger reached ½ of the distance to the bottom of the cylinder was measured and defined as the flow softening point.

To produce the toner for developing an electrostatic charge image of the present invention, a colorant, if necessary, a charge control agent, magnetic powder, etc. are added to the polyester resin, and the mixture is heat-melt kneaded and pulverized. . As the colorant, carbon black, aniline blue, phthalocyanine blue, quinoline yellow,
Malachite Green, Lamp Black, Rhodamine-
B, quinacridone, etc. can be used, and usually 1 to 20% by weight is added to the polyester resin. As the charge control agent, a nigrosine dye, a quaternary ammonium salt, a pyridinium salt, azine or the like for positively charged toner is added in an amount of 0.1 to 10% by weight based on the polyester resin. A toner using a polyester resin generally gives a negative chargeability, but when a charge control agent for a negatively chargeable toner is added as necessary, a chromium complex, an iron complex or the like is used. Further, when the negative chargeability is too strong, it is possible to control the neutralization by adding the positive charge control agent.

[0020]

EXAMPLES Next, typical synthetic examples of the binder resin made of the polyester resin used in the present invention and examples using the same will be described, but the present invention is not limited thereto. Synthesis example 1 Ethylene oxide adduct of bisphenol A 316.
0 g (hereinafter abbreviated as BPA · E0), pentaerythritol 13.6 g, isophthalic acid 166.1 g, and low molecular weight polypropylene wax (manufactured by Sanyo Kasei Kogyo Co., Ltd., trade name Viscole 660P, SP value 8.1) 9.2 g are made of glass. The mixture was placed in a 1-liter four-necked flask, equipped with a thermometer, a stirrer, a downflow condenser and a nitrogen introduction tube, and reacted under a nitrogen stream at a reaction temperature of 180 to 220 ° C. using a mantle heater. After finishing the outflow of water, set 1 in the reactor.
The pressure was reduced to 0 Torr or less, the condensation reaction was performed, and the reaction was terminated when a certain torque was reached. DSC of the obtained resin
Tg of the product was 64 ° C and the flow softening point of the product was 130 ° C.

Synthesis Example 2 BPA · E0316.0 g, pentaerythritol 1
3.6 g, terephthalic acid 166.1 g, and low-molecular-weight polyethylene wax (trade name Hoechst wax PE130 manufactured by Hoechst Japan Co., Ltd., 9.2 g) were placed in a 4-necked flask, and the same operation as in Synthesis Example 1 was performed. The resin thus obtained had a Tg of 63 ° C. and a flow softening point of 125.
° C.

Synthesis Example 3 BPA · E0316.0 g, isophthalic acid 166.1
g, trimellitic anhydride 19.2 g, and paraffin wax (trade name Paranock-101 manufactured by Nippon Oil Co., Ltd.)
9.2 g was put in a four-necked flask and synthesized in the same manner as in Synthesis Example 1. The obtained resin had a Tg of 64 ° C and a flow softening point of 128 ° C.

Synthesis Example 4 BPA · E0316.0 g, pentaerythritol 1
3.6 g, TPA166.1 g terephthalic acid, and rice wax (trade name Rice No. manufactured by Noda Wax Co., Ltd.)
1) was placed in a 4-neck flask and a resin was synthesized in the same manner as in Synthesis Example 1. The obtained resin had a Tg of 56 ° C and a flow softening point of 125 ° C.

Comparative Synthesis Example 1 (without wax) BPA · E0316.0 g, pentaerythritol 1
3.6 g and 166.1 g of isophthalic acid were placed in a 4-neck flask, and a resin was synthesized in the same manner as in Synthesis Example 1. The obtained resin had a Tg of 64 ° C and a flow softening point of 125 ° C.

Comparative Synthesis Example 2 (without wax) BPA · E0316.0 g, pentaerythritol 1
3.6 g and 166.1 g of terephthalic acid were placed in a 4-necked flask and synthesized by the same operation. Tg of the obtained resin
Was 65 ° C and the flow softening point was 135 ° C.

Example 1 Resin of Synthesis Example 1 93 parts by weight Carbon black (trade name MA-100 manufactured by Mitsubishi Kasei) 5 parts by weight Chromium complex salt dye (trade name TRH manufactured by Hodogaya Chemical Co., Ltd.) 2 parts by weight The mixture was melt-kneaded in a twin-screw kneader at about 150 ° C. After cooling the melt-kneaded product, it was pulverized and classified to obtain negatively chargeable toner particles having an average particle diameter of 8.5 μm. To 100 parts by weight of the toner particles, 0.5 part by weight of hydrophobic colloidal silica was externally added by a Henschel mixer to obtain a toner for developing an electrostatic charge image of the present invention. Further, in the toner particles, wax was dispersed as uniform fine particles having a particle size of 0.5 to 2 μm by observation with a biological microscope.

Example 2 Resin of Synthesis Example 2 93 parts by weight Carbon black (trade name MA-100 manufactured by Mitsubishi Kasei) 5 parts by weight Quaternary ammonium salt compound (trade name Bontron P-51 manufactured by Orient Chemical Co.) 2 parts by weight Parts A mixture having the above composition was subjected to the same operations as in Example 1 to obtain an electrostatic image developing toner of the present invention. The toner particles have a wax with a particle diameter of 0.5 when observed with a biological microscope.
It was dispersed as uniform fine particles of ˜2 μm.

Example 3 Resin of Synthesis Example 3 93 parts by weight Carbon black (trade name MA-100 manufactured by Mitsubishi Kasei) 5 parts by weight Chromium complex salt dye (trade name Bontron S-44 manufactured by Orient Chemical Co.) 2 parts by weight Above The mixture containing the components was treated in the same manner as in Example 1 to obtain the electrostatic image developing toner of the present invention. The toner particles have a wax with a particle diameter of 0.5 when observed with a biological microscope.
It was dispersed as uniform fine particles of ˜2 μm.

Example 4 Resin of Synthesis Example 4 93 parts by weight Carbon black (trade name MA-100 manufactured by Mitsubishi Kasei) 5 parts by weight Chromium complex salt dye (trade name Bontron S-34 manufactured by Orient Chemical Co.) 2 parts by weight The mixture containing the components was treated in the same manner as in Example 1 to obtain toner particles. The wax in the toner particles could not be confirmed by observation with a biological microscope.

Comparative Example 1 Resin of Comparative Synthetic Example 1 91 parts by weight Low molecular weight polypropylene (manufactured by Sanyo Chemical Industry Co., Ltd., trade name Viscole 660P) 2 parts by weight Carbon black (Mitsubishi Chemical Co., trade name MA-100) 5 parts by weight Chromium Complex salt dye (Bontron S-44, trade name, manufactured by Orient Chemical Co., Ltd.) 2 parts by weight The mixture having the above composition was subjected to the same operation as in Example 1 to obtain toner particles. The wax in the toner particles has a particle diameter of 0.5 to several tens μ as observed by a biological microscope.
It was present as m non-uniform particles.

Comparative Example 2 Resin of Comparative Synthetic Example 2 91 parts by weight Low molecular weight polyethylene (trade name PE130 manufactured by Hoechst Japan) 2 parts by weight Carbon black (trade name MA-100 manufactured by Mitsubishi Kasei) 5 parts by weight Quaternary ammonium Salt compound (Bontron P-51, trade name, manufactured by Orient Chemical Co., Ltd.) 2 parts by weight The mixture having the above composition was subjected to the same operation as in Example 1 to obtain toner particles. The wax in the toner particles was present as non-uniform particles of 0.5 to several tens of μm as observed by a biological microscope.

Next, the following tests were conducted on the toners for developing electrostatic image obtained in the above-mentioned Examples and Comparative Examples. (1) Non-offset temperature region and non-offset temperature range 5 parts by weight of the toner for developing an electrostatic image and the ferrite carrier (trade name DFC manufactured by Dowa Iron Powder Co., Ltd.) obtained in each example.
150S6) 95 parts by weight were mixed to prepare a two-component developer. Then, using the developer, a commercially available copying machine (Z-133 manufactured by Sanyo Electric Co., Ltd.) was used to vertically transfer 2c onto A4 transfer paper.
A plurality of band-shaped unfixed images each having a size of m and a width of 5 cm were prepared. Then, the surface layer is fluororesin (Teflon, trade name of DuPont)
Adjust the fixing machine that rotates by rotating the heat fixing roll formed in 1. and the pressure fixing roll whose surface layer is made of silicone rubber so that the roll pressure is 1 kg / cm ² and the roll speed is 200 mm / sec. Then, the surface temperature of the heat fixing roll was changed stepwise to fix the toner image on the transfer paper having the unfixed image at each surface temperature. At this time, it was observed whether or not toner stains were generated in the margins, the temperature region where stains did not occur was taken as the non-offset temperature region, and the difference between the maximum and minimum values of the non-offset temperature region was taken as the non-offset temperature width. .

(2) Fixing Strength The surface temperature of the heat fixing roll of the fixing machine was set to 130 ° C., and the toner image on the transfer paper on which the unfixed image was formed was fixed. Then, after the image density of the formed fixed image was measured using a reflection densitometer (trade name: RD-914, manufactured by Macbeth Co., Ltd.), the fixed image was rubbed with a cotton pad, and then similarly. The image density was measured. The fixing strength was calculated from the obtained measured value by the following formula and used as an index of the low energy toner. Fixing strength (%) = (image density of fixed image after rubbing / image density before rubbing) × 100

(3) Blocking Test The toner particles for developing an electrostatic image obtained in each example were put in a plastic bottle and allowed to stand in a thermostat at 50 ° C. for 1 day, after which the toner particles in the bottle were blocked. The existence was confirmed. ○ indicates that there is no blocking at all,
The symbol Δ indicates that there is some blocking, but there is no practical problem. Table 1 shows the measurement results of the above items.

[0035]

[Table 1]

As is clear from the results shown in Table 1, in the non-offset temperature region of the toner for developing an electrostatic charge image of the present invention, no offset occurs from a low temperature to a high temperature, and the non-offset temperature range is 100 ° C. or more. Therefore, it was confirmed that a practically sufficient range was maintained. Also, 130
It was confirmed that the low temperature fixability was excellent because the fixing strength at the fixing temperature of ° C was 87% or more and the fixing strength was practically sufficient. Further, the image density of the developed image was sufficient, and there was no fog or the like in the non-image portion, which was practically sufficient. On the other hand, Comparative Examples 1 and 2
Although the non-offset temperature region and the non-offset temperature width are practically sufficient, the fixing strength at the fixing temperature of 130 ° C. is low, the image density of the developed image is low, and The omission and fogging of the non-developed area were noticeable and not practical. Comparative Example 3
The fixability was the same as that of the example and there was no problem in practical use, but the storage stability was not practical because blocking was confirmed by a blocking test. Further, by using each developer and the copying machine of the embodiment in the above item (1), 10000
A continuous copy test up to a sheet was performed. As a result, in all the examples, the triboelectric charge amount by the blow-off triboelectric charge amount measuring device (manufactured by Toshiba Chemical Co., Ltd.) changed from -25 μc / g to −29 μc / g from the initial stage to 10000 sheets, and the image The density was maintained at 1.4 or more in the process of continuous copying from the initial stage to 10,000 sheets, and the background fog in the non-image area measured by a color difference meter (product name Z-1001DP manufactured by Nippon Denshoku Co., Ltd.) was 0.6 or less. It was confirmed that there was no problem in practical use.

[0037]

The toner for developing an electrostatic image of the present invention has a sufficient non-offset temperature region, can be fixed at a low temperature, has excellent fixing strength, and has a sufficient image density. The effect is that you can get one. Therefore, when the electrostatic image developing toner of the present invention is applied to a copying machine, a printer or the like, it is possible to reduce power consumption, and it is extremely possible to reduce the machine cost by lowering the pressure of the roll and increase the copying speed. It is valid.

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[Procedure amendment]

[Submission date] August 17, 1994

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The toner for developing electrostatic images [Title of Invention] Oyo originator manufacturing method of

[Procedure Amendment 2]

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[Name of item to be amended] Claims

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[Claims]

[Procedure 3]

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[Correction target item name] 0010

[Correction method] Change

[Correction content]

The present invention is characterized in that in the toner for developing an electrostatic charge image containing a binder resin and a colorant as main components, a particulate wax of 5 μm or less is dispersed in the polyester resin as the binder resin. It is a toner for developing an electrostatic image, and it is preferable that the fine particle wax having a particle size of 5 μm or less is contained in an amount of 1 to 20% by weight based on the polyester resin.
Further, in the present invention, a polyester resin is used as the binder resin, A: diol component, B: dicarboxylic acid or its acid anhydride or lower alkyl ester component thereof, C: 3
Valence higher polyhydric alcohol component, D: when a trivalent or higher-valent carboxylic acid or its acid anhydride or its lower alkyl ester component, A + B + C, A + B + C + D,
A toner for developing an electrostatic image using a polyester resin obtained by polycondensation by any combination of A + B + D is preferable.

Claims (6)

[Claims] 1. A toner for developing an electrostatic charge image containing a binder resin and a colorant as main components, wherein the binder resin is 5 μm.
An electrostatic charge developing toner characterized in that the following fine particle wax is dispersed in a polyester resin. 2. The toner for developing an electrostatic charge image according to claim 1, which contains 1 to 20% by weight of a particulate wax of 5 μm or less based on the polyester resin. 3. The toner for developing an electrostatic charge image according to claim 1, wherein the fine particle wax is a synthetic wax or a petroleum wax. 4. The polyester resin comprises A: a diol component, B: a dicarboxylic acid or an acid anhydride thereof or a lower alkyl ester component thereof, C: a polyhydric alcohol component having a valence of 3 or more, and D: a polyvalent having a valence of 3 or more. A resin obtained by polycondensation of any one of A + B + C, A + B + C + D and A + B + D when the carboxylic acid or its acid anhydride or its lower alkyl ester component is used. The toner for developing an electrostatic image as described above. 5. When a polyester resin is produced by polycondensing an acid component and an alcohol component, the polyester resin is reacted in the presence of a wax that is incompatible with the polyester resin to disperse the wax in the form of fine particles. A toner for developing an electrostatic charge image, comprising a step of producing a densified polyester resin, and a step of adding at least a colorant to the wax-dispersed polyester resin obtained in the above step, followed by hot melt kneading and pulverization. Production method. 6. An acid component and an alcohol component for synthesizing a polyester resin, A: a diol component, B: a dicarboxylic acid or an acid anhydride thereof or a lower alkyl ester component thereof, C: a polyhydric alcohol component having a valence of 3 or more, 6. The electrostatic image development according to claim 5, wherein D: a trivalent or higher polycarboxylic acid or an acid anhydride thereof or a lower alkyl ester component thereof is formed by any combination of A + B + C, A + B + C + D and A + B + D. Of manufacturing toner for toner.