JP5326370B2 - Toner for developing electrostatic image, developer for developing electrostatic image, and image forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrostatic charge image developing toner for thermal fixation which has a low minimum fixing temperature and is superior in image quality, hot offset resistance property and maintenance performance in continuous test. <P>SOLUTION: The electrostatic charge image developing toner for thermal pressure fixation includes a center core and an outer shell, the center core containing a block copolymer composed of crystalline polyester block and amorphous polyester block, wherein a resin contained in the outer shell has a glass transition temperature (Tg) between Tg of the crystalline polyester block and Tg of the amorphous polyester block. The electrostatic charge image developing toner for thermal pressure fixation includes a center core and an outer shell, the center core being an aggregated particle obtained by aggregating resin particles having a core-shell structure, wherein the difference between Tg of resin contained in core of the core-shell structure and Tg of resin contained in shell is 20&deg;C or more, and the resin contained in the outer shell has the Tg between the Tg of the resin contained in the core and the Tg of the resin contained in the shell. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electrostatic charge image developing toner, an electrostatic charge image developer, and an image forming method.

  A method of visualizing image information through an electrostatic charge image such as electrophotography is currently used in various fields. In electrophotography, an electrostatic charge image (electrostatic latent image) is formed on a photoconductor (latent image carrier) by charging and exposure processes, and then the electrostatic latent image is developed with a developer containing toner, transferred, It is visualized through the fixing process. The developer used here includes a two-component developer composed of a toner and a carrier, and a one-component developer using a magnetic toner or a nonmagnetic toner alone. As a method for producing a toner, a kneading and pulverizing method is generally used in which a thermoplastic resin is melt-kneaded together with a release agent such as a pigment, a charge control agent, and a wax, cooled, finely pulverized, and further classified.

On the other hand, in order to reduce energy consumption, a technique capable of fixing at a lower temperature is desired. Particularly in recent years, in order to thoroughly save energy, the energization of the fixing device is stopped except during use. Therefore, it is necessary to increase the temperature of the fixing machine to the operating temperature instantly while energizing. For this purpose, it is desirable to make the heat capacity of the fixing machine as small as possible, but the temperature fluctuation of the fixing machine tends to be larger than before.
In addition, when the heat capacity of the fixing machine is reduced, the temperature drop due to paper passing also increases. In addition, when paper having a width smaller than the width of the fixing device is continuously passed, the temperature difference between the paper passing portion and the non-paper passing portion also increases. In particular, when used in a high-speed copying machine or printer, there is a strong tendency to cause the above phenomenon. Therefore, there is a strong demand for a toner having a wide so-called fixing latitude that can be fixed at a low temperature and does not cause an offset to a higher temperature region.

Conventionally, the main focus was on fixing fixing by heating rather than pressure, so there was no significant improvement in energy reduction in the electrophotographic system. Use cardboard, which is important when dealing with the printing market, especially in the electrophotographic system. There was no means to achieve high-speed fixing with a simple fixing machine.
In order to improve gloss unevenness that is likely to occur during high-speed fixing of cardboard, and to achieve high-quality images with a high-speed and simple fixing machine, it is necessary to have a precise design of the resin structure that enables plasticization by pressure. However, the conventional polymerization method is difficult.

  On the other hand, for polymers that are hard at room temperature (high glass transition temperature (high Tg)) and soft (low Tg) polymers, certain combinations exhibit fluidity below the melting point of those polymers under pressure and form. It is possible. A polymer material having such properties is called baroplastic. For example, Patent Document 1 describes baroplastics, and pressure-formed bodies, elastomers, and pressure-sensitive adhesives are listed as application areas.

US Pat. No. 6,632,883

  The problems to be solved by the present invention include a toner for developing an electrostatic charge image for heat and pressure fixing having a low minimum fixing temperature, excellent hot offset resistance, image quality, and continuous test maintainability, and the electrostatic image development described above. And an image forming method using the electrostatic charge image developing toner.

The problem to be solved by the present invention has been solved by the following means.
<1> A core having an outer shell, wherein the core includes a block copolymer composed of a crystalline polyester block and an amorphous polyester block, and the glass transition temperature of the resin contained in the outer shell is the crystalline property. An electrostatic charge image developing toner for heat and pressure fixing, characterized in that it is a value between the glass transition temperature of the polyester block and the glass transition temperature of the non-crystalline polyester block;
<2> Aggregated particles having a core and an outer shell, the core being obtained by aggregating resin particles having a core-shell structure, and included in the glass transition temperature of the resin contained in the core of the core-shell structure and the shell The difference between the glass transition temperature of the resin is 20 ° C. or more, and the glass transition temperature of the resin contained in the outer shell is the glass transition temperature of the resin contained in the core and the glass transition temperature of the resin contained in the shell. An electrostatic charge image developing toner for heat and pressure fixing, characterized in that the value is between
<3> The electrostatic image developing toner according to <1> or <2>, wherein the acid value of the whole resin contained in the outer shell is higher than the acid value of the whole resin contained in the core,
<4> An electrostatic charge image developer comprising the electrostatic image developing toner according to any one of <1> to <3> and a carrier,
<5> An electrostatic latent image forming step for forming an electrostatic latent image on the surface of the latent image holding member, an electrostatic latent image formed on the surface of the latent image holding member with a toner for developing an electrostatic image or the toner and a carrier A developing step of developing with an electrostatic charge image developer to form a toner image, a transferring step of transferring the toner image formed on the surface of the latent image holding member to the surface of the transfer target, and a transfer to the surface of the transfer target A heat-pressure fixing step of fixing the toner image by heating and pressing, wherein the electrostatic image developing toner is the electrostatic image developing toner according to any one of <1> to <3>, Alternatively, the electrostatic image developer is the electrostatic image developer according to <4>, and the fixing pressure in the fixing step is 1 to 50 MPa.

  According to the present invention, an electrostatic charge image developing toner for thermal pressure fixing having a low minimum fixing temperature, excellent hot offset resistance, image quality, and continuous test maintainability, and an electrostatic charge including the electrostatic charge image developing toner An image developer and an image forming method using the electrostatic image developing toner can be provided.

I. Toner for developing electrostatic image The toner for developing electrostatic image for heat and pressure fixing according to the present invention has a core and an outer shell, and the core comprises a crystalline polyester block and an amorphous polyester block. The glass transition temperature of the resin contained in the outer shell is a value between the glass transition temperature of the crystalline polyester block and the glass transition temperature of the non-crystalline polyester block (hereinafter referred to as “the glass transition temperature”). , Also referred to as “electrostatic image developing toner (A)”).

The electrostatic charge image developing toner for heat and pressure fixing of the present invention is an aggregated particle obtained by aggregating resin particles having a core and an outer shell, and the core has a core-shell structure, and the core-shell structure The difference between the glass transition temperature of the resin contained in the core of the resin and the glass transition temperature of the resin contained in the shell is 20 ° C. or more, and the glass transition temperature of the resin contained in the outer shell is that of the resin contained in the core. The value is between the glass transition temperature and the glass transition temperature of the resin contained in the shell (hereinafter, also referred to as “electrostatic image developing toner (B)”).
Hereinafter, the electrostatic image developing toner (A) and the electrostatic image developing toner (B) of the present invention will be described in detail.

I-1. Regarding the electrostatic image developing toner (A) In the present invention, the electrostatic image developing toner has a core and an outer shell, and the core includes at least a crystalline polyester block and an amorphous polyester block. Includes coalescence.

1. Electrostatic charge image developing toner (A) core (1) Block copolymer The block copolymer may have other blocks in addition to the crystalline polyester block and the amorphous polyester block. A block copolymer composed of a polyester block and an amorphous block is preferred.

When a crystalline resin and an amorphous resin form a block copolymer, such a resin exhibits a plastic behavior with respect to pressure, and exhibits fluidity even in a normal temperature region under a certain pressure. . Further, it is considered that such plasticization flow behavior is promoted under slight heating, and the resin fluidity necessary for fixing can be obtained even under a lower pressure.
In the present invention, by using a block copolymer containing a crystalline polyester block and an amorphous polyester block, it is possible to impart fluidity under a certain pressure or higher, and at a pressure lower than that, Can behave very solidly. Such a resin may be called a baroplastic. By including such a ballo plastic in the core, it is possible to improve the reliability in the development, transfer, cleaning process, etc. other than during pressure fixing.
In high-speed fixing using thick paper, the thermal energy consumed by the paper increases, so the temperature fluctuation of the fixing roll is likely to occur, and due to non-uniform image gloss due to non-uniform temperature in the paper and between the paper, Deterioration in image quality is likely to occur.
In particular, the electrostatic image developing toner (A) of the present invention can be suitably used for fixing onto thick paper, where temperature fluctuations are likely to occur during fixing, because a plasticizing flow behavior can be obtained by heating and pressing. . Up to now, high-speed fixing is difficult, and fixing to thick paper, which had been difficult without slowing down the fixing speed or setting a high heating temperature, should be performed at the same fixing speed and temperature setting as fixing to thin paper. Is possible.

  The block copolymer containing a crystalline polyester block and an amorphous polyester block may be obtained by any method. Specifically, a method in which a crystalline polyester resin and an amorphous polyester resin are mixed and obtained by a polymerization reaction, and a method in which a crystalline polyester resin is mixed with an amorphous polyester resin forming monomer for polymerization Alternatively, the reverse method can be used. Among these, a method of mixing a crystalline polyester resin and an amorphous polyester resin and obtaining a block copolymer by a polymerization reaction is preferable.

  The crystalline polyester block (crystalline polyester) and non-crystalline polyester block (non-crystalline polyester) used in the present invention are, for example, aliphatic, alicyclic, aromatic polyvalent carboxylic acids or alkyl esters thereof. , Polyol or their ester compounds, and polycondensation monomers such as hydroxycarboxylic acid can be used to carry out polycondensation by direct esterification reaction or transesterification reaction in an aqueous medium.

“Crystallinity” as shown in the above “crystalline polyester” means that in differential scanning calorimetry (DSC), it has a clear endothermic peak, not a stepwise endothermic change. Means that the half-value width of the endothermic peak when measured at a heating rate of 10 ° C./min is within 15 ° C., and so on.
On the other hand, a resin having an endothermic peak with a half-value width exceeding 15 ° C. or a resin having no clear endothermic peak means non-crystalline (amorphous), and so on.

In the present invention, polycondensable monomers used for the production of the polyester resin include polyvalent carboxylic acids and polyols. The polyvalent carboxylic acid is a compound containing two or more carboxy groups in one molecule. Among these, dicarboxylic acid is a compound containing two carboxy groups in one molecule. For example, oxalic acid, glutaric acid, succinic acid, maleic acid, adipic acid, β-methyladipic acid, azelaic acid, sebacic acid, Nonanedicarboxylic acid, decanedicarboxylic acid, undecanedicarboxylic acid, dodecanedicarboxylic acid, fumaric acid, citraconic acid, diglycolic acid, cyclohexane-3,5-diene-1,2-carboxylic acid, malic acid, citric acid, hexahydroterephthalate Acid, malonic acid, pimelic acid, tartaric acid, mucous acid, phthalic acid, isophthalic acid, terephthalic acid, tetrachlorophthalic acid, chlorophthalic acid, nitrophthalic acid, p-carboxyphenylacetic acid, p-phenylenediacetic acid, m-phenylenediglycol Acid, p-phenylene diglycolic acid, o-phenylene di- Recolic acid, diphenylacetic acid, diphenyl-p, p'-dicarboxylic acid, naphthalene-1,4-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, anthracene dicarboxylic acid, cyclohexanedicarboxylic acid Etc.
Examples of the polyvalent carboxylic acid other than dicarboxylic acid include trimellitic acid, pyromellitic acid, naphthalenetricarboxylic acid, naphthalenetetracarboxylic acid, pyrenetricarboxylic acid, and pyrenetetracarboxylic acid. Moreover, you may use what derived the carboxy group of these carboxylic acid into the acid anhydride, mixed acid anhydride, acid chloride, or ester.

The polyol that can be used in the present invention is a compound containing two or more hydroxyl groups in one molecule. Among these, diol is a compound containing two hydroxyl groups in one molecule, and examples thereof include ethylene glycol, propylene glycol, butanediol, diethylene glycol, hexanediol, cyclohexanediol, octanediol, decanediol, dodecanediol and the like. Can do. Examples of polyols other than diols include glycerin, pentaerythritol, hexamethylol melamine, hexaethylol melamine, tetramethylol benzoguanamine, and tetraethylol benzoguanamine.
Since these polyols are hardly soluble or insoluble in the aqueous medium, the ester synthesis reaction proceeds in the monomer droplets in which the polyol is dispersed in the aqueous medium.

  In the present invention, examples of the hydroxycarboxylic acid that can be used as a polyester polycondensable monomer include hydroxyheptanoic acid, hydroxyoctanoic acid, hydroxydecanoic acid, and hydroxyundecanoic acid.

  By combining these polycondensable monomers, an amorphous polyester or a crystalline polyester can be easily obtained. Hereinafter, the polycondensable monomer suitably used for crystalline polyester and non-crystalline polyester will be described.

(Crystalline polyester)
As the polyvalent carboxylic acid used to obtain the crystalline polyester, among the above carboxylic acids, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, peric acid, azelaic acid, sebacic acid, Maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, n-dodecyl succinic acid, n-dodecenyl succinic acid, isododecyl succinic acid, isododecenyl succinic acid, n-octyl succinic acid, n-octenyl succinic acid, these And acid anhydrides or acid chlorides thereof.

Polyols used to obtain crystalline polyester include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,4-butenediol. , Neopentyl glycol, 1,5-pentane glycol, 1,6-hexane glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, dipropylene glycol, polyethylene glycol, polypropylene glycol and the like.
In addition, a crystalline polyester obtained by ring-opening polymerization of a cyclic monomer such as caprolactone is preferable because its crystalline melting point is in the vicinity of 60 ° C. and is suitable for a toner.

Examples of such a crystalline polycondensation resin include 1,9-nonanediol and 1,10-decanedicarboxylic acid, polyester obtained by reacting cyclohexanediol and adipic acid, 1,6-hexanediol and sebacin. Polyester obtained by reacting acid, polyester obtained by reacting ethylene glycol and succinic acid, polyester obtained by reacting ethylene glycol and sebacic acid, reacting 1,4-butanediol and succinic acid The polyester obtained by doing this can be mentioned.
Among these, polyesters obtained by reacting 1,9-nonanediol and 1,10-decanedicarboxylic acid, and 1,6-hexanediol and sebacic acid are more preferable. A crystalline polyester obtained by ring-opening polymerization of a cyclic monomer such as caprolactone is also preferred.

(Non-crystalline polyester)
As the polyvalent carboxylic acid used to obtain the non-crystalline polyester in the present invention, among the above polyvalent carboxylic acids, the dicarboxylic acids include phthalic acid, isophthalic acid, terephthalic acid, tetrachlorophthalic acid, chlorophthalic acid. Acid, nitrophthalic acid, p-carboxyphenylacetic acid, p-phenylenediacetic acid, m-phenylenediglycolic acid, p-phenylenediglycolic acid, o-phenylenediglycolic acid, diphenylacetic acid, diphenyl-p, p'-dicarboxylic acid And naphthalene-1,4-dicarboxylic acid, naphthalene-1,5-dicarboxylic acid, naphthalene-2,6-dicarboxylic acid, anthracene dicarboxylic acid, and cyclohexanedicarboxylic acid. Examples of the polyvalent carboxylic acid other than dicarboxylic acid include trimellitic acid, pyromellitic acid, naphthalenetricarboxylic acid, naphthalenetetracarboxylic acid, pyrenetricarboxylic acid, and pyrenetetracarboxylic acid. Moreover, you may use what derived the carboxy group of these carboxylic acid into the acid anhydride, the acid chloride, or ester.
Among these, it is preferable to use terephthalic acid or its lower ester, diphenylacetic acid, cyclohexanedicarboxylic acid, or the like. The lower ester refers to an ester of an aliphatic alcohol having 1 to 8 carbon atoms.

Among the above polyols, polytetramethylene glycol, bisphenol A, bisphenol Z, hydrogenated bisphenol A, cyclohexanedimethanol, etc. are preferably used as the polyol used to obtain the amorphous polyester in the present invention. .
Further, a polycondensate of hydroxycarboxylic acid can be used as the amorphous resin. Hydroxycarboxylic acid is a compound having both a hydroxyl group and a carboxy group in the molecule. Examples of the hydroxycarboxylic acid include aromatic hydroxycarboxylic acids and aliphatic hydroxycarboxylic acids, but it is preferable to use aliphatic hydroxycarboxylic acids. Specific examples include hydroxyheptanoic acid, hydroxyoctanoic acid, hydroxydecanoic acid, hydroxyundecanoic acid, and lactic acid. Of these, lactic acid is preferably used.

By combining the above polycondensable monomers, an amorphous polyester or a crystalline polyester can be easily obtained.
In order to produce one type of polycondensation resin, each of the polyvalent carboxylic acid and polyol may be used alone or in combination of two or more, each of which may be used alone or in combination of two or more. You may use each. Moreover, when using hydroxycarboxylic acid in order to produce 1 type of polycondensation resin, 1 type may be used individually, 2 or more types may be used, and polyvalent carboxylic acid and a polyol may be used together.

  The weight ratio of the crystalline polyester block to the amorphous polyester block in the block copolymer is preferably crystalline polyester block / non-crystalline polyester block = 1/20 to 20/1, and preferably 1/10 to 10 / 1 is more preferable. Further, when the ratio is 1/9 to 5/5, deterioration of toner charging property due to crystalline polyester can be suppressed. When the ratio of the crystalline polyester block to the amorphous polyester block is within the above range, the chargeability and mechanical strength as a block copolymer when a toner is produced are sufficient, and the low-temperature fixability is excellent. Furthermore, the flow behavior under pressure is excellent.

  When a crystalline polyester resin and an amorphous polyester resin are mixed and a block copolymer is obtained by a polymerization reaction, the crystalline polyester resin preferably has a crystalline melting point of 40 to 150 ° C. More preferably, it is 100 degreeC, and it is especially preferable that it is 50-80 degreeC. It is preferable that the crystalline melting point of the crystalline polyester to be used is in the above range because the resulting toner has good blocking resistance, good fluidity even at low temperatures, and good fixability.

  The melting point of the crystalline polyester can be measured by, for example, “DSC-20” (manufactured by Seiko Instruments Inc.) according to differential scanning calorimetry (DSC). Specifically, about 10 mg of a sample is measured at a constant rate of temperature increase. It can be determined as the melting peak temperature of the input compensated differential scanning calorimetry shown in JIS K 7121-1987 when the measurement is carried out at a temperature increase rate of 10 ° C. per minute from room temperature to 150 ° C. at (10 ° C./min). A crystalline resin may show a plurality of melting peaks, but in the present invention, the maximum peak is regarded as the melting point.

  On the other hand, when a crystalline polyester and an amorphous polyester are mixed to obtain a block copolymer by a polymerization reaction, the glass transition temperature of the amorphous polyester is preferably 50 to 80 ° C, and preferably 50 to 65 ° C. It is more preferable that When the glass transition temperature is 50 ° C. or higher, the cohesive strength of the binder resin itself in a high temperature range is good, and hot offset hardly occurs during fixing, and when it is 80 ° C. or lower, sufficient melting is obtained. The minimum fixing temperature does not increase.

  On the other hand, the glass transition temperature of the crystalline polyester is lower than the glass transition temperature of the amorphous polyester, preferably −100 to 50 ° C., more preferably −80 to 40 ° C. When it is within the above numerical range, the pressure fixing property is good.

Here, the glass transition temperature of the non-crystalline resin refers to a value measured by a method (DSC method) defined in ASTM D3418-82.
Moreover, the measurement of the glass transition temperature in the present invention can be measured by, for example, “DSC-20” (manufactured by Seiko Instruments Inc.) according to the differential scanning calorimetry (DSC). About 10 mg is heated at a constant rate of temperature increase (10 ° C./min), and the glass transition temperature can be obtained from the intersection of the baseline and the endothermic peak slope.

The glass transition temperature of the block copolymer is preferably 50 to 80 ° C, and more preferably 50 to 65 ° C. It is preferable for the glass transition temperature of the block copolymer to be in the above-mentioned range since toner cake formation is difficult to occur and storage properties are good.
Moreover, it is preferable that it is 50-100 degreeC, and, as for melting | fusing point of a block copolymer, it is more preferable that it is 50-80 degreeC. When the melting point of the block copolymer is within the above range, it is preferable because the fixing property and charging property to cardboard and the like, and the filming durability to the photoconductor are easily compatible. In the block copolymer, the melting point and the glass transition temperature may not be clearly observed.

  Control of the glass transition temperature is mainly determined by how densely rigid units such as aromatic rings and cyclohexane rings are incorporated in the main chain repeating units of the polycondensation resin, and in addition, side chains such as aliphatic groups. Increasing the density decreases the glass transition temperature. That is, if the density of methylene group, ethylene group, oxyethylene group or the like in the main chain is high, the glass transition temperature is lowered, and if the number of aromatic rings or cyclohexane rings is increased, it is raised. By considering these, polycondensation resins having various glass transition temperatures can be obtained.

When a crystalline polyester resin and an amorphous polyester resin are mixed and a block copolymer is obtained by a polymerization reaction, the weight average molecular weight of the crystalline polyester resin to be mixed should be 1,000 to 100,000. Preferably, it is 1,500 to 10,000.
Moreover, it is preferable that the weight average molecular weights of the amorphous polyester resin to mix are 1,000-100,000, and it is more preferable that it is 2,000-10,000.
In the present invention, the weight average molecular weight of the block copolymer is preferably 5,000 to 500,000, and more preferably 5,000 to 50,000. In addition, the block copolymer that can be used in the present invention may be partially branched or cross-linked by selecting a carboxylic acid valence or an alcohol valence of a monomer, adding a cross-linking agent, or the like.

The values of the weight average molecular weight Mw and the number average molecular weight Mn can be determined by various known methods, and there are some differences depending on the measurement methods, but in the present invention, the values are determined by the following measurement methods. Is preferred. That is, the weight average molecular weight Mw and the number average molecular weight Mn are measured by gel permeation chromatography (GPC) under the conditions described below. At a temperature of 40 ° C., a solvent (tetrahydrofuran) is flowed at a flow rate of 1.2 ml per minute, and 3 mg of a tetrahydrofuran sample solution having a concentration of 0.2 g / 20 ml is injected as a sample weight for measurement. When measuring the molecular weight of a sample, select the measurement conditions that fall within the range in which the logarithm of the molecular weight of the prepared calibration curve and the count number are linear, using several monodisperse polystyrene standard samples. . In addition, the reliability of the measurement results is that the NBS706 polystyrene standard sample performed under the above measurement conditions is
Weight average molecular weight Mw = 28.8 × 10 ⁴
Number average molecular weight Mn = 13.7 × 10 ⁴
Can be confirmed.
As the GPC column to be used, any column may be adopted as long as it satisfies the above conditions. Specifically, for example, TSK-GEL, GMH (manufactured by Tosoh Corporation) or the like can be used.
In addition, a solvent and measurement temperature are not limited to the conditions described above, You may change to an appropriate condition.

Crystalline polyester and non-crystalline polyester can be produced by subjecting the polyvalent carboxylic acid and polyol to a polycondensation reaction according to a conventional method. This polycondensation reaction can be carried out by a polycondensation method such as underwater polymerization such as bulk polymerization, emulsion polymerization or suspension polymerization, solution polymerization or interfacial polymerization, but bulk polymerization is preferably used.
Although the reaction is possible under atmospheric pressure, general conditions such as reduced pressure and nitrogen flow can be used for the purpose of increasing the amount of the polyester obtained.
Specifically, the polyvalent carboxylic acid and polyol, and a catalyst as required, are mixed in a reaction vessel equipped with a thermometer, a stirrer, and a flow-down condenser, and in the presence of an inert gas (such as nitrogen gas). It is manufactured by removing the low-molecular compound produced as a by-product continuously from the reaction system, stopping the reaction when it reaches the predetermined molecular weight, cooling it, and obtaining the desired reactant. Can do.

In addition, it is preferable that at least one of the crystalline polyester and the amorphous polyester is polymerized at 150 ° C. or lower in the presence of a sulfur acid catalyst, and both the crystalline polyester and the amorphous polyester are used. Is preferably polymerized at 150 ° C. or lower in the presence of a sulfur acid catalyst.
Furthermore, the step of forming the block copolymer is preferably obtained by adding a sulfur acid catalyst as a catalyst to the crystalline polyester and the amorphous polyester and heating at 150 ° C. or less. More preferably, it is 70-150 degreeC, and it is further more preferable that it is 80-140 degreeC. When the reaction temperature is within the above range, the reactivity of the monomer and the catalytic activity are not lowered, and the molecular weight is not suppressed from being increased. be able to. Further, there is no coloration of the resin or decomposition of the produced polyester.

Examples of the polycondensation catalyst having catalytic activity at low temperatures include sulfur acids, metal catalysts, other acid catalysts, other rare earth-containing catalysts, hydrolases, and the like. Among these, it is preferable to use sulfur acid.
(Sulfuric acid catalyst)
Examples of the sulfur acid catalyst include alkylbenzene sulfonic acids such as dodecylbenzene sulfonic acid, isopropyl benzene sulfonic acid, and camphor sulfonic acid, alkyl sulfonic acid, alkyl disulfonic acid, alkyl phenol sulfonic acid, alkyl naphthalene sulfonic acid, alkyl tetralin sulfonic acid, Alkyl allyl sulfonic acid, petroleum sulfonic acid, alkyl benzimidazole sulfonic acid, higher alcohol ether sulfonic acid, alkyl diphenyl sulfonic acid, monobutyl phenyl phenol sulfuric acid, dibutyl phenyl phenol sulfuric acid, higher fatty acid sulfuric acid ester such as dodecyl sulfuric acid, higher alcohol sulfuric acid ester , Higher alcohol ether sulfate, higher fatty acid amide alkylol sulfate, higher fatty acid amide alkylated sulfate Naphthenyl alcohol sulfuric acid, sulfated fatty, sulfosuccinic acid esters, sulfonated higher fatty acid, a resin acid alcohol sulfuric acid, and any salt compound thereof or the like can be used, but is not limited thereto. Moreover, these catalysts may have a functional group in the structure. A plurality of these catalysts may be combined as necessary. Examples of the Bronsted acid catalyst containing sulfur that can be preferably used include alkylbenzenesulfonic acid, and among these, dodecylbenzenesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, camphorsulfonic acid, and the like are preferable.

(Metal catalyst)
Examples of the metal catalyst include, but are not limited to, the following. For example, an organic tin compound, an organic titanium compound, an organic tin halide compound, and a rare earth metal catalyst can be used.
Specific examples of the rare earth-containing catalyst include scandium (Sc), yttrium (Y), and lanthanoid elements such as lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), and europium. (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), etc. are effective. is there. Of these, alkylbenzene sulfonates, alkyl sulfate esters, and those having a triflate structure are particularly effective. Examples of the triflate include X (OSO ₂ CF ₃ ) _{3 in} the structural formula. Here, X is a rare earth element, and among these, X is preferably scandium (Sc), yttrium (Y), ytterbium (Yb), samarium (Sm), or the like.
The lanthanoid triflate is described in detail in Journal of Synthetic Organic Chemistry, Vol. 53, No. 5, p44-54.

  When a metal catalyst is used as the catalyst, the metal content derived from the catalyst in the obtained resin is preferably 100 ppm or less, more preferably 75 ppm or less, and even more preferably 50 ppm or less. Therefore, it is preferable not to use a metal catalyst or to use a very small amount even when a metal catalyst is used.

(Hydrolytic enzyme type catalyst)
The hydrolase type catalyst is not particularly limited as long as it catalyzes an ester synthesis reaction. Examples of the hydrolase in the present invention include EC (enzyme number) 3.1 group such as carboxyesterase, lipase, phospholipase, acetylesterase, pectinesterase, cholesterol esterase, tannase, monoacylglycerol lipase, lactonase, lipoprotein lipase and the like. (See Maruo and Tamiya's "Enzyme Handbook" Asakura Shoten, (1982), etc.) Hydrolase enzymes classified into EC 3.2 group that act on glycosyl compounds such as esterases, glucosidases, galactosidases, glucuronidases, xylosidases ECs that act on peptide bonds such as hydrolase, aminopeptidase, chymotrypsin, trypsin, plasmin, subtilisin, etc. classified into EC 3.3 group such as epoxide hydrase Hydrolase classified .4 group, mention may be made of hydrolytic enzymes such as classified into EC3.7 group such as furo retinoic hydrolase.
Among the above esterases, enzymes that hydrolyze glycerol esters to liberate fatty acids are called lipases, but lipases are highly stable in organic solvents, catalyze ester synthesis reactions in high yields, and are available at a lower price. There are advantages such as what you can do. Therefore, in the present invention, it is desirable to use lipase from the viewpoint of yield and cost.
Lipases of various origins can be used, but preferred are Pseudomonas genus, Alcaligenes genus, Achromobacter genus, Candida genus, Aspergillus genus, Rhizopus Examples include lipases obtained from microorganisms such as (Rhizopus) genus and Mucor genus, lipases obtained from plant seeds, lipases obtained from animal tissues, pancreatin, steapsin and the like. Among these, it is desirable to use lipases derived from microorganisms of the genus Pseudomonas, Candida, and Aspergillus.

(Basic catalyst)
Examples of the basic catalyst include, but are not limited to, general organic basic compounds, nitrogen-containing basic compounds, and tetraalkyl or arylphosphonium hydroxides such as tetrabutylphosphonium hydroxide. Examples of the organic base compound include ammonium hydroxides such as tetramethylammonium hydroxide and tetraethylammonium hydroxide, and examples of the nitrogen-containing basic compound include amines such as triethylamine and dibenzylmethylamine, pyridine, methylpyridine, methoxypyridine, Quinolin, imidazole, alkali metals such as sodium, potassium, lithium, cesium, and alkaline earth metals such as calcium, magnesium, barium, hydroxides, hydrides, amides, alkalis, alkaline earth metals and acids And salts with carbonates, phosphates, borates, carboxylates and phenolic hydroxyl groups.
Further, compounds such as alcoholic hydroxyl groups and chelate compounds with acetylacetone can be exemplified, but the invention is not limited to these.

(Bronsted acid catalyst without sulfur)
Examples of the Bronsted acid catalyst not containing sulfur include, but are not limited to, various fatty acids, higher alkyl phosphate esters, resin acids, naphthenic acids, and niobic acids.

  The total amount of catalyst added is preferably 0.01 to 10% by weight, more preferably 0.01 to 8% by weight, based on the polycondensation component. One type of catalyst can be used alone, or two or more types can be used in combination.

  The crystalline polyester and the non-crystalline polyester can be produced by known polycondensation methods such as underwater polymerization such as bulk polymerization, emulsion polymerization, suspension polymerization, solution polymerization, and interfacial polymerization. A bulk polycondensation method can be preferably used. Although the reaction can be performed under atmospheric pressure, general conditions such as reduced pressure and nitrogen flow can be widely used for the purpose of increasing the molecular weight of a polycondensation resin such as polyester.

The polycondensation reaction or the polymerization reaction described below may be performed using an aqueous medium.
Examples of the aqueous medium that can be used in the present invention include water such as distilled water and ion exchange water, and alcohols such as ethanol and methanol. Among these, ethanol and water are preferable, and water such as distilled water and ion-exchanged water is particularly preferable. These may be used individually by 1 type and may use 2 or more types together.
The aqueous medium may contain a water-miscible organic solvent. Examples of the water-miscible organic solvent include acetone and acetic acid.

The polycondensation reaction or the polymerization reaction described below may be performed using an organic solvent.
Specific examples of organic solvents that can be used in the present invention include hydrocarbon solvents, halogen solvents, ketone solvents, ether solvents, thioether solvents, ester solvents, alkyl substituted diphenyl ethers, halogen substituted diphenyl ethers, alkoxy substituted diphenyl ethers. And diphenyl ether solvents such as cyclic diphenyl ether, which may be used in combination.

  Further, in order to obtain a polyester having a high average molecular weight, a dehydration and demonomer may be added to the organic solvent. Specific examples of the dehydration and demonomer include, for example, molecular sieves such as molecular sieve 3A, molecular sieve 4A, molecular sieve 5A, molecular sieve 13X, alumina, silica gel, calcium chloride, calcium sulfate, diphosphorus pentoxide, concentrated Examples include sulfuric acid, magnesium perchlorate, barium oxide, calcium oxide, potassium hydroxide, sodium hydroxide, metal hydrides such as calcium hydride, sodium hydride, lithium aluminum hydride, or alkali metals such as sodium. It is done. Among these, molecular sieves are preferable because of easy handling and regeneration.

<Other binder resins>
Examples of the binder resin that can be used in the toner for developing an electrostatic charge image of the present invention include ethylene resins such as polyethylene and polypropylene, styrene resins mainly composed of polystyrene, poly (α-methylstyrene), and polymethyl ( (Meth) acrylate, polyacrylonitrile and other (meth) acrylic resins, polyamide resins, polycarbonate resins, polyether resins, polyester resins and copolymer resins thereof may be mentioned, but styrene resins, (meth) acrylic Of these resins, styrene- (meth) acrylic copolymer resins and polyester resins are more preferred.

  As a polyester resin, the polyester resin mentioned above can be mentioned preferably. As a method for producing a polyester resin, in addition to the above-described methods, for example, “polycondensation” (Chemical Doujin, 1971), “Polymer Experimental Studies (Polycondensation and Polyaddition)” (Kyoritsu Shuppan, 1958), “ Polyester resin handbook "(edited by Nikkan Kogyo Shimbun, published in 1988) can be synthesized using a conventionally known method, and a transesterification method or a direct polycondensation method can be used alone or in combination. Can be synthesized.

Moreover, addition polymerization type resins are also useful as other binder resins that can be used in the present invention. Examples of the addition polymerizable monomer for producing the addition polymerization type resin include a radical polymerizable monomer, a cationic polymerizable monomer, and an anion polymerizable monomer, which are radical polymerizable monomers. It is preferable that it is an ethylenically unsaturated monomer. Preferred examples of the radical polymerization resin include styrene resins and (meth) acrylic resins, particularly styrene- (meth) acrylic copolymer resins.
Examples of the styrene- (meth) acrylic copolymer resin include 60 to 90 parts by weight of an aromatic monomer (styrene monomer) having an ethylenically unsaturated group, and an ethylenically unsaturated carboxylic acid ester monomer. (Copolymer) obtained by polymerizing a monomer mixture consisting of 10 to 40 parts by weight of (meth) acrylic acid ester monomer and 1 to 3 parts by weight of ethylenically unsaturated acid monomer Latex dispersed and stabilized with an agent can be preferably used.

  Further, in the production of the binder resin, when polycondensation and / or polymerization is performed in an aqueous medium, in order to form a monomer particle emulsion, for example, a monomer solution to which a co-surfactant is added ( Oil phase) and aqueous medium solution of surfactant (aqueous phase), a piston homogenizer, a microfluidizer (for example, “Microfluidizer” manufactured by Microfluidics), a shear mixing device such as an ultrasonic disperser The method of uniformly mixing and emulsifying can be exemplified. In that case, it is preferable that the preparation amount of the oil phase with respect to the water phase is about 0.1 to 50% by weight with respect to the total amount of the water phase and the oil phase. The amount of the surfactant used is preferably less than the critical micelle concentration (CMC) in the presence of the emulsion to be formed, and the amount of the cosurfactant used is preferably 100 parts by weight of the oil phase. Is 0.1 to 40 parts by weight, more preferably 0.1 to 20 parts by weight.

  As described above, the “mini” is a polymerization of the monomer in the presence of the polymerization initiator of the monomer emulsion by the combined use of the surfactant amount less than the critical micelle concentration (CMC) and the co-surfactant. The “emulsion polymerization method” is preferable because uniform polymer particles are formed because the addition polymerizable monomer is polymerized in the monomer particles (oil droplets). Further, in the present invention, even in the polycondensable / addition polymerizable composite polymer, the “miniemulsion polymerization method” does not require monomer diffusion in the polymerization process. It has the advantage that it can be present in the particles.

  Further, for example, a particle size of 5 to 50 nm described in JS Guo, MS El-Aasser, JW Vanderhoff; J. Polym. Sci .: Polym. Chem. Ed., 27, 691 (1989), etc. The so-called “microemulsion polymerization method” of these particles has the same dispersion structure and polymerization mechanism as the “miniemulsion polymerization method” in the present invention, and can be used in the present invention. The “microemulsion polymerization method” uses a large amount of a surfactant having a critical micelle concentration (CMC) or more, and a large amount of the surfactant is mixed in the resulting polymer particles or the removal of the surfactant. For this reason, there may be a problem that a great amount of time is required for a process such as water cleaning, acid cleaning, or alkali cleaning.

Further, when polycondensation and / or polymerization is carried out in an aqueous medium in the production of the binder resin, it is preferable to use a co-surfactant, and 0.1 to 40% by weight of the co-interface with respect to the total amount of monomers. More preferably, an activator is used. Co-surfactants are added to reduce Ostwald ripening in so-called miniemulsion polymerization. As the co-surfactant, generally known co-surfactants can be used in the mini-emulsion method.
Examples of suitable co-surfactants include alkanes having 8 to 30 carbon atoms such as dodecane, hexadecane and octadecane, alkyl alcohols having 8 to 30 carbon atoms such as lauryl alcohol, cetyl alcohol and stearyl alcohol, lauryl mercaptan, C8-C30 alkyl mercaptans such as cetyl mercaptan and stearyl mercaptan, and other polymers such as acrylic esters and methacrylic esters and their polymers, polystyrene and polyester, polyadducts, carboxylic acids and ketones Amines and the like, but is not limited thereto.

  The content of the surfactant in each dispersion may be a level that does not inhibit the present invention, and is generally a small amount, specifically in the range of 0.01 to 3% by weight, more Preferably it is the range of 0.05-2 weight%, More preferably, it is the range of 0.1-2 weight%. When the content is within the above range, each dispersion such as a resin particle dispersion, a colorant dispersion, and a release agent dispersion is stable, and aggregation and release of specific particles do not occur. The effect of the present invention can be sufficiently obtained without affecting the addition amount. In general, a suspension-polymerized toner dispersion having a large particle size is stable even when a small amount of a surfactant is used.

As the dispersion stabilizer used in the suspension polymerization method or the like, a slightly water-soluble and hydrophilic inorganic powder can be used. Examples of the inorganic powder that can be used include silica, alumina, titania, calcium carbonate, magnesium carbonate, tricalcium phosphate (hydroxyapatite), clay, diatomaceous earth, bentonite and the like. Among these, calcium carbonate, tricalcium phosphate and the like are preferable from the viewpoints of easy particle size formation and easy removal.
Also, an aqueous polymer that is solid at room temperature can be used as a dispersion stabilizer. Specifically, cellulose compounds such as carboxymethyl cellulose and hydroxypropyl cellulose, polyvinyl alcohol, gelatin, starch, gum arabic and the like can be used.

(2) Colorant There is no restriction | limiting in particular as a colorant which can be used for this invention, A well-known colorant is mentioned, It can select suitably according to the objective. One colorant may be used alone, or two or more colorants of the same system may be mixed and used. Further, two or more kinds of different colorants may be mixed and used. Further, these colorants may be used after surface treatment.

Specific examples of the colorant include black, yellow, orange, red, blue, purple, green, and white colorants as shown below.
Examples of the black pigment include organic and inorganic colorants such as carbon black, aniline black, activated carbon, nonmagnetic ferrite, and magnetite.
Yellow pigments include yellow lead, zinc yellow, yellow calcium oxide, cadmium yellow, chrome yellow, fast yellow, fast yellow 5G, fast yellow 5GX, fast yellow 10G, benzidine yellow G, benzidine yellow GR, selenium yellow, quinoline yellow, Permanent yellow NCG can be exemplified.
Examples of the orange pigment include red yellow lead, molybdenum orange, permanent orange GTR, pyrazolone orange, vulcan orange, benzidine orange G, indanthrene brilliant orange RK, indanthrene brilliant orange GK and the like.
Red pigments include Bengala, cadmium red, red lead, mercury sulfide, watch young red, permanent red 4R, risor red, brilliantamine 3B, brilliantamine 6B, dapon oil red, pyrazolone red, rhodamine B rake, lake red C Rose Bengal, Eoxin Red, Alizarin Lake and the like.
Examples of blue pigments include organic and inorganic colorants such as bitumen, cobalt blue, alkali blue lake, Victoria blue lake, fast sky blue, indanthrene blue BC, ultramarine blue, phthalocyanine blue, and phthalocyanine green. .
Examples of purple pigments include organic and inorganic colorants such as manganese purple, fast violet B, and methyl violet lake.
Examples of the green pigment include organic and inorganic colorants such as chromium oxide, chromium green, pigment green B, malachite green lake, and fanal yellow green G.
Examples of white pigments include zinc white, titanium oxide, antimony white, and zinc sulfide.
Examples of extender pigments include barite powder, barium carbonate, clay, silica, white carbon, talc, and alumina white.

The colorant that can be used in the electrostatic image developing toner (A) of the present invention can be dispersed in the binder resin by a known method. If the toner is based on a kneading and pulverizing method, it may be used as it is, or a so-called master batch that is previously dispersed in a resin at a high concentration and then kneaded with a binder resin at the time of kneading may be used. You may use the flushing disperse | distributed in resin in the state of the wet cake before drying after a coloring agent synthesis | combination.
The above-mentioned colorant can be used as it is for toner preparation by suspension polymerization. In suspension polymerization, the colorant dispersed in a resin is dissolved or dispersed in a polymerizable monomer. The colorant can be dispersed in the granulated particles.

When the toner production method is an emulsion polymerization agglomeration method, a colorant dispersion is prepared by dispersing the colorant in an aqueous medium together with a dispersant such as a surfactant by mechanical impact, etc. It can be obtained by agglomerating together and granulating to a toner particle size.
Specific examples of the colorant dispersion by mechanical impact or the like include, for example, a rotary shear type homogenizer, a ball-type mill, a sand mill, an attritor-type media type disperser, a high-pressure counter-collision type disperser, etc. A dispersion can be prepared. These colorants can also be dispersed in an aqueous system by a homogenizer using a polar surfactant.

  The colorant is preferably added in a range of 4 to 15% by weight with respect to the total solid content of the electrostatic image developing toner (A) in order to ensure color developability at the time of fixing. It is more preferable to add in the range of% by weight. However, when a magnetic material is used as the black colorant, it is preferably added in the range of 12 to 48% by weight, and more preferably in the range of 15 to 40% by weight. Each color toner such as yellow toner, magenta toner, cyan toner, black toner, white toner, and green toner can be obtained by appropriately selecting the type of the colorant.

(3) Release agent A release agent may be added to the electrostatic image developing toner (A) of the present invention as necessary, and the release agent is added to the core and outer shell of the electrostatic image development toner. And a mode in which a release agent is added to the core. In the present invention, a mode in which the mold release agent is added to the core is preferable. The release agent is generally used for the purpose of improving the releasability.
Specific examples of the release agent include low molecular weight polyolefins such as polyethylene, polypropylene and polybutene, silicones having a softening point by heating, fatty acid amides such as oleic acid amide, erucic acid amide, ricinoleic acid amide and stearic acid amide. Plant waxes such as carnauba wax, rice wax, candelilla wax, tree wax, jojoba oil, animal waxes such as beeswax, montan wax, ozokerite, ceresin, paraffin wax, microcrystalline wax, Fischer-Tropsch wax, etc. Examples thereof include mineral-petroleum waxes, ester waxes such as fatty acid esters, montanic acid esters, and carboxylic acid esters. In this invention, these mold release agents may be used individually by 1 type, and may use 2 or more types together.

  The amount of these release agents added is preferably 1 to 20% by weight, more preferably 5 to 15% by weight, based on the total amount of the electrostatic charge image developing toner (A). If it is within the above numerical value range, the effect of the release agent is sufficient, and since the toner particles are not easily destroyed inside the developing machine, the spent release agent on the carrier does not occur and the charge is also reduced. It is preferable because it is difficult to do.

(4) Aggregating agent When the emulsion aggregation coalescence method is used for producing the core of the electrostatic image developing toner (A) of the present invention, particles can be prepared by causing aggregation due to pH change in the aggregation process. . At the same time, an aggregating agent may be added in order to stably and rapidly aggregate the particles, or to obtain aggregated particles having a narrower particle size distribution.

As the flocculant, a compound having a monovalent or higher charge is preferable, and specific examples of the compound include inorganic acid metal salts, water-soluble surfactants, acids, aliphatic acid or aromatic acid metal salts, Examples include inorganic acid salts of aliphatic and aromatic amines.
In particular, when a metal salt of an inorganic acid is used, it is preferable in characteristics such as aggregation control and toner chargeability. The metal salt used for aggregation is obtained by dissolving an inorganic metal compound or a polymer thereof in a resin particle dispersion. The metal element constituting the inorganic metal salt has a divalent or higher charge belonging to the 2A, 3A, 4A, 5A, 6A, 7A, 8, 1B, 2B, 3B group in the periodic table (long periodic table). There is no limitation as long as it dissolves in the form of ions in the aggregation system of resin particles. Metal salts of inorganic acids include metal salts such as sodium chloride, calcium chloride, calcium nitrate, barium chloride, magnesium chloride, zinc chloride, aluminum chloride, aluminum sulfate, and polyaluminum chloride, polyaluminum hydroxide, calcium polysulfide And inorganic metal salt polymers. Among these, an aluminum salt and a polymer thereof are particularly preferable. In general, in order to obtain a sharper particle size distribution, it is preferable that the valence of the inorganic metal salt is bivalent rather than monovalent, and trivalent or more valent than bivalent. A type of inorganic metal salt polymer is more suitable.
Examples of water-soluble surfactants include ionic surfactants and nonionic surfactants, and examples of acids include hydrochloric acid, sulfuric acid, nitric acid, acetic acid, oxalic acid, and the like, and aliphatic acids and aromatic acids. Examples of the metal salt include sodium acetate, potassium formate, sodium oxalate, sodium phthalate, and potassium salicylate. Examples of the metal salt of phenol include sodium phenolate, and aliphatic and aromatic amines. Examples of inorganic acid salts include metal salts of amino acids, triethanolamine hydrochloride, aniline hydrochloride, and the like.
The amount of the flocculant added varies depending on the valence of the charge, but all of them are small, and in the case of monovalent, about 3% by weight or less with respect to the total amount of toner, and in the case of divalent, about 1% by weight or less. In the case of trivalent, it is about 0.5% by weight or less. Since the amount of the flocculant is preferably small, it is preferable to use a compound having a large valence.

(5) Other Additives A charge control agent may be added to the core of the electrostatic image developing toner (A) of the present invention as necessary.
Known charge control agents can be used, but azo metal complex compounds, metal complex compounds of salicylic acid, and resin-type charge control agents containing polar groups can be used. When the toner is manufactured by a wet manufacturing method, it is preferable to use a material that is difficult to dissolve in water in terms of controlling ionic strength (%) and reducing wastewater contamination. The toner of the present invention may be either a magnetic toner containing a magnetic material or a non-magnetic toner containing no magnetic material.

The electrostatic charge image developing toner (A) of the present invention may contain a magnetic substance, if necessary.
As the magnetic material, ferrite, magnetite and other iron, cobalt, nickel and other metals or alloys exhibiting ferromagnetism, compounds containing these elements, or ferromagnetic elements which are not subjected to appropriate heat treatment An alloy that exhibits ferromagnetism, for example, a kind of alloy called a Heusler alloy containing manganese and copper, such as manganese-copper-aluminum, manganese-copper-tin, or chromium dioxide, and the like can be given.
For example, in the case of obtaining a black toner, it is particularly preferable to use magnetite which is black in itself and also functions as a colorant. In the case of obtaining a color toner, a toner having a small blackness such as metallic iron is preferable. Some of these magnetic materials also function as a colorant, and in that case, they may also be used as a colorant. When the magnetic toner is used, the content of these magnetic materials is preferably 20 to 70 parts by weight, more preferably 40 to 70 parts by weight per 100 parts by weight of the toner.

The toner for developing an electrostatic charge image (A) of the present invention may contain an internal additive inside the toner. The internal additive is generally used for the purpose of controlling the viscoelasticity of the fixed image.
Specific examples of the internal additive include inorganic particles such as silica and titania, organic particles such as polymethyl methacrylate, and surface treatment may be performed for the purpose of improving dispersibility. These may be used alone or in combination of two or more internal additives.

  Furthermore, if necessary, one or more known additives can be added in combination as long as they do not affect the results of the present invention. For example, flame retardant, flame retardant auxiliary, brightener, waterproofing agent, water repellent, inorganic filler (surface modifier), antioxidant, plasticizer, surfactant, dispersant, lubricant, filler, constitution Pigments, binders, charge control agents and the like. These additives can be blended in any process for producing an electrostatic image developing toner.

2. About outer shell (1) Resin contained in outer shell The electrostatic charge image developing toner (A) of the present invention has a core and an outer shell, and the core comprises a crystalline polyester block and an amorphous polyester block. The glass transition temperature of the resin containing the copolymer and contained in the outer shell is a value between the glass transition temperature of the crystalline polyester block and the glass transition temperature of the amorphous polyester block, To do.

The outer shell is preferably a hydrophilic resin. Examples of the hydrophilic resin include non-crystalline polyester, polyamide, polyester amide, and polyurea. The main component is non-crystalline polyester, that is, 50 to 100% by weight of non-crystalline polyester in the total weight of the outer shell. A resin is preferable, and an outer shell made of only amorphous polyester is more preferable.
The non-crystalline polyester is preferably obtained by condensation polymerization of one or more polyols and one or more polyvalent carboxylic acid monomers, and is preferably a trivalent or higher polyol monomer and / or a trivalent or higher polyvalent polyester. Those obtained by condensation polymerization using a monomer containing a carboxylic acid monomer are more preferred, and those obtained using a monomer containing a trivalent or higher polyvalent carboxylic acid monomer are more preferred. .

  Examples of the dihydric alcohol component include polyoxypropylene (2.2) -2,2-bis (4-hydroxyphenyl) propane and polyoxypropylene (3.3) -2,2-bis (4-hydroxyphenyl). Propane, polyoxypropylene (2.0) -2,2-bis (4-hydroxyphenyl) propane, polyoxypropylene (2.0) -polyoxyethylene (2.0) -2,2-bis (4- Alkylene oxide adducts of bisphenol A such as hydroxyphenyl) propane, polyoxypropylene (6) -2,2-bis (4-hydroxyphenyl) propane, ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, neopenty Glycol, 1,4-butenediol, 1,5-pentanediol, 1,6-hexanediol, 1,4-cyclohexanedimethanol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, bisphenol A, bisphenol A propylene adduct of A, ethylene adduct of bisphenol A, hydrogenated bisphenol A and the like.

  Examples of the trivalent or higher alcohol component include sorbitol, 1,2,3,6-hexanetetrol, 1,4-sorbitan, pentaerythritol, dipentaerythritol, tripentaerythritol, 1,2,4-butanetriol, 1,2,5-pentanetriol, glycerol, 2-methylpropanetriol, 2-methyl-1,2,4-butanetriol, trimethylolethane, trimethylolpropane, 1,3,5-trihydroxymethylbenzene, etc. Can be mentioned. Preferably, a trivalent alcohol is used. In the present invention, these divalent alcohol monomers and trivalent or higher polyol monomers can be used alone or in combination.

  Divalent polycarboxylic acids include maleic acid, fumaric acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, terephthalic acid, succinic acid, adipic acid, sebacic acid, azelaic acid, malonic acid , N-dodecenyl succinic acid, n-dodecyl succinic acid, n-octyl succinic acid, isooctenyl succinic acid, isooctyl succinic acid and derivatives of these acids such as anhydrides and lower alkyl esters.

  Examples of the trivalent or higher polyvalent carboxylic acid include 1,2,4-benzenetricarboxylic acid (trimellitic acid), 2,5,7-naphthalenetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, 4-butanetricarboxylic acid, 1,2,5-hexanetricarboxylic acid, 1,3-dicarboxyl-2-methyl-2-methylenecarboxypropane, 1,2,4-cyclohexanetricarboxylic acid, tetra (methylenecarboxyl) methane, Examples include 1,2,7,8-octanetetracarboxylic acid, pyromellitic acid, emporic trimer acid, and derivatives thereof such as acid anhydrides and lower alkyl esters, and trivalent carboxylic acids or derivatives thereof are used. It is preferable. In the present invention, one or more monomers can be used from the group consisting of these divalent carboxylic acid monomers and trivalent or higher carboxylic acid monomers.

  The method for producing an amorphous polyester that can be used for the outer shell is not particularly limited, and can be produced by known esterification and transesterification using the above-mentioned monomers.

(2) External additive The electrostatic charge image developing toner (A) of the present invention is preferably used by adding external additives such as inorganic particles to the toner surface for the purpose of imparting fluidity and improving cleaning properties.
Examples of such inorganic particles include silica powder, alumina, titanium oxide, barium titanate, magnesium titanate, calcium titanate, strontium titanate, zinc oxide, silica sand, clay, mica, wollastonite, diatomaceous earth, Examples thereof include chromium oxide, cerium oxide, bengara, antimony trioxide, magnesium oxide, zirconium oxide, barium sulfate, barium carbonate, calcium carbonate, silicon carbide, and silicon nitride. Silica powder is particularly preferable.
The silica powder here is a powder having a Si—O—Si bond, and includes both those produced by a dry method and a wet method. In addition to anhydrous silicon dioxide, any of aluminum silicate, sodium silicate, potassium silicate, magnesium silicate, zinc silicate and the like may be used, but those containing SiO _{2 in an amount} of 85% by weight or more are preferable.
Specific examples of these silica powders include various commercially available silicas, but those having a hydrophobic group on the surface are preferable. For example, AEROSIL R-972, R-974, R-805, R-812 (manufactured by Aerosil Co., Ltd.) ), Thalax 500 (manufactured by Tarco) and the like. In addition, silica powder treated with a silane coupling agent, a titanium coupling agent, silicon oil, silicon oil having an amine in the side chain, or the like can be used.
The inorganic particles that can be used in the present invention are particles having a primary particle diameter of 5 nm to 2 μm, preferably 5 nm to 500 nm.
It is preferable that the specific surface area by BET method is 20-500 m < ² > / g.
The proportion of the toner mixed with the electrostatic image developing toner is preferably 0.01 to 5% by weight, more preferably 0.01 to 2.0% by weight, based on the total amount of the toner.

3. In the present invention, the glass transition temperature of the resin contained in the outer shell is equal to the glass transition temperature of the crystalline polyester block and the amorphous polyester block. It is a value between the glass transition temperature of.
When a non-crystalline polyester resin and a crystalline polyester resin are mixed to obtain a block copolymer, the glass transition temperature of the non-crystalline polyester resin is preferably 50 to 80 ° C. The upper limit of the glass transition temperature is lower than the glass transition temperature of the amorphous polyester resin, preferably 80 ° C. or less, more preferably 70 ° C. or less, and further preferably 65 ° C. or less.
Further, the lower limit of the glass transition temperature of the resin contained in the outer shell is higher than the glass transition temperature of the crystalline polyester resin, preferably 40 ° C. or higher, and more preferably 50 ° C. or higher. Within the above numerical range, the storage stability and fixability of the electrostatic image developing toner are excellent.

  Further, the acid value of the whole resin contained in the outer shell is preferably higher than the acid value of the whole resin contained in the core, preferably 3-50 (KOHmg / g), and 10-30 (KOHmg / G) is more preferable. Within the range of the above numerical values, an electrostatic charge image developing toner excellent in storage stability can be obtained because the resin serving as the material of the outer shell is likely to come out at the interface between water and resin particles, and the production stability is also excellent. The acid value can be measured according to JIS K0070.

I-2. Toner for electrostatic image development (B)
Next, the electrostatic image developing toner (B) will be described.
The electrostatic image developing toner (B) for heat and pressure fixing of the present invention is an aggregated particle obtained by aggregating resin particles having a core and an outer shell, and the core has a core-shell structure. The difference between the glass transition temperature of the resin contained in the core of the structure and the glass transition temperature of the resin contained in the shell is 20 ° C. or more, and the glass transition temperature of the resin contained in the outer shell is a resin contained in the core It is a value between the glass transition temperature of this and the glass transition temperature of resin contained in the said shell, It is characterized by the above-mentioned.

  In high-speed fixing using thick paper, the thermal energy consumed by the paper increases, so the temperature fluctuation of the fixing roll is likely to occur, and due to non-uniform image gloss due to non-uniform temperature in the paper and between the paper, Deterioration in image quality is likely to occur.

The toner for developing an electrostatic charge image (B) of the present invention is composed of a resin having a low glass transition temperature (also referred to as “low Tg resin”) and a resin having a high glass transition temperature (also referred to as “high Tg resin”). It is a toner in which a core obtained by agglomerating core-shell particles by a combination having a formed core-shell structure and exhibiting pressure plasticization (Pressure Induced Miscibility) is coated with an outer shell.
This electrostatic charge image developing toner (B) realizes fixing by heating at a low temperature, improves the uniformity of image gloss, and reduces the energy consumed especially for toner fixing using cardboard, and also gives heat to cardboard. This reduces mechanical stress and suppresses the occurrence of damage in thick paper such as paper curl.

When the high Tg resin and the low Tg resin form a micro phase separation state, the resin exhibits a plastic behavior with respect to pressure, and exhibits fluidity even in a normal temperature region under a certain pressure or higher. The resin is sometimes called baroplastic. Further, under a slight heating, such plasticization flow behavior is promoted, and the resin fluidity necessary for fixing can be obtained even under a lower pressure.
With such a toner, fixing to thick paper, which has been difficult unless the printing speed is reduced or a high heating temperature is set, has the same printing speed and temperature settings as those for fixing to thin paper. Image formation is possible.

In addition, in this way, fluidity is imparted to the toner when a pressure above a certain level is applied, and at a pressure lower than that, it behaves extremely solidly, so that the toner other than during thermal pressure fixing in the electrophotographic process is given. High reliability can be ensured in the development, transfer, and cleaning processes.
In addition, by providing high reliability, it is possible to use a toner having a small diameter such as 5 μm or less, which has been difficult to realize in the past, thereby reducing toner consumption and realizing a high-definition image. It is possible to achieve both image quality, reliability, and economy by reducing toner consumption.

In a conventional electrophotographic process, the maximum pressure at the time of pressure fixing in a fixing machine is usually 1 MPa or less, and is actually set in the range of 0.2 to 0.6 MPa in many cases.
In the present invention, it is fundamental that both low-temperature fixability and high reliability can be achieved by actively using the pressure plasticizing effect of the microphase separation resin composed of domains having different Tg depending on the fixing pressure. It has a working effect.

  According to the electrostatic charge image developing toner (B) of the present invention, it is possible to cope with lower fixing temperature and faster fixing to thick paper even in a pressure range of a fixing machine in a conventional electrophotographic process. Further, when the high pressure range, that is, the maximum pressure is 1 to 50 MPa, a particularly great effect can be exhibited.

1. Electrostatic charge image developing toner (B) core (1) Resin particles having a core-shell structure The core of the electrostatic charge image developing toner (B) of the present invention is obtained by agglomerating resin particles having a core-shell structure. The toner particles contain a plurality of resin particles having a core-shell structure. The core-shell particles can exhibit plastic behavior with respect to pressure by setting the difference between the glass transition temperature of the resin constituting the core and the glass transition temperature of the resin constituting the shell to 20 ° C. or more.
Either the resin constituting the core of the core-shell particle or the resin constituting the shell may be a high Tg resin. In the present invention, of the core or shell, the higher glass transition temperature is also referred to as a high Tg phase, and the lower one is also referred to as a low Tg phase.

  The glass transition temperature of the high Tg phase is preferably 45 to 80 ° C, and more preferably in the range of 50 to 70 ° C. If it is within the above range, it is excellent in storage as a toner, and it is difficult for filming to occur on the photoreceptor during caking or continuous printing during transportation or in printers, and image quality defects also occur. Hard to happen. Further, the fixing temperature at the time of fixing (especially at the time of fixing thick paper) is moderate, and it is difficult to cause damage to a transfer medium such as paper curl.

  It is important that the glass transition temperature of the low Tg phase is 20 ° C. or more lower than the glass transition temperature of the high Tg phase, and preferably 30 ° C. or less. When the glass transition temperature difference between the high Tg phase and the low Tg phase is within 20 ° C., the pressure plasticization behavior becomes difficult to be observed, the fixing temperature during fixing (especially during thick paper fixing) becomes high, and the material to be transferred such as paper curl Invite to damage.

It is preferable to use two types of polycondensation resins having different glass transition temperatures, and to select them so that the SP values (solubility parameters) of these resins are different by 0.2 or more. It is preferable to provide 5 or more difference in acid value of the polycondensation resin. By mixing them and granulating them in an aqueous medium, a resin having a small SP value or a small acid value becomes a core, and a resin having a large SP value or a large acid value becomes a shell. It is preferable because core-shell particles made of a resin having a transition temperature can be easily obtained.
The core-shell particles that can be used in the present invention may be a shell having a small SP value or a small acid value, and a core being a resin having a large SP value or a large acid value.
The method for obtaining the core-shell particles is not limited to the above method.
However, if the core-shell particles are mixed and processed at a high temperature and high pressure as in the prior art for kneading, as in the prior art, the precisely formed phase separation structure is destroyed and the desired characteristics cannot be obtained. there is a possibility.
For this reason, a method of producing particles in an aqueous medium using water or the like is suitable as a method of producing this toner.
In order to use the resin obtained here as a binder resin to form a toner by a dissolution suspension method or an emulsion polymerization aggregation method, a conventionally known production method can be used.

  The core-shell particles by these combinations can observe the pressure plastic behavior regardless of which is the shell or the core. However, in order to make the toner compatible and have durability during transportation and storage, the shell side has a high Tg. It is desirable to arrange the phases. The SP value (solubility parameter value) can be calculated by a known Fedors method.

  The median diameter of the core-shell particles is preferably 1/2 to 1/1000, preferably 1/5 to 1 / 1,000, and 1/10 of the volume average particle diameter of the toner. It is more preferable that it is ~ 1/200. The above range is preferable because the toner particle size distribution can be easily controlled.

The median diameter of the core-shell particles is preferably 0.01 to 1.0 μm, more preferably 0.05 to 0.7 μm, still more preferably 0.1 to 0.5 μm, It is particularly preferable that the thickness is 1 to 0.3 μm. It is preferable that the average particle size of the core-shell particles be within the above numerical range because the toner particle size distribution can be easily controlled.
In addition, the median diameter of the core-shell particles can be measured by a known method, and for example, it can be measured with a laser diffraction particle size distribution measuring apparatus (LA-920, manufactured by Horiba, Ltd.).

  The method for confirming that there are a plurality of core-shell particles contained in the core of the electrostatic image developing toner (B) is not particularly limited, and is a method of observing the cross section of the toner with a transmission electron microscope, For example, a method of observing the cross section with a scanning electron microscope with a clear contrast can be used. In some cases, it is clear that there are two or more core-shell particles contained in the toner from the ratio of the toner particle diameter to the core-shell particles at the time of manufacture, the amount of core-shell particles used, the production method, and the like.

The resin constituting the core and the shell is a polycondensation resin, and if the difference between the glass transition temperature of the resin constituting the core and the glass transition temperature of the resin constituting the shell is 20 ° C. or more, particularly As long as it can be used without limitation and has a glass transition temperature, it may be a crystalline resin or an amorphous resin.
In general, a crystalline resin has a low glass transition temperature and can be suitably used as a resin constituting a low Tg phase. It is also preferable to use a low Tg phase as a crystalline resin and a high Tg phase as an amorphous resin.

As a monomer for constituting the polycondensation resin constituting the core or shell, for example, a polyvalent carboxylic acid containing two or more carboxy groups in one molecule or two or more hydroxyl groups in one molecule Polyols can be used. Among these, dicarboxylic acid is a compound containing two carboxy groups in one molecule, and diol is a compound containing two hydroxyl groups in one molecule.
As the polyvalent carboxylic acid and polyol used for the production of the electrostatic image developing toner (B), known ones can be used and are not limited, but the same as those used for the electrostatic image developing toner (A). Things can be used.

  In order to obtain a crystalline polyester by combining polyvalent carboxylic acid and polyol, in particular, 1,9-nonanediol and 1,10-decanmethylenedicarboxylic acid, and 1,6-hexanediol and sebacic acid are used. The polyester obtained by the reaction has a low glass transition temperature and is preferable for use as a core of resin particles.

Moreover, as polyvalent carboxylic acid used in order to obtain the amorphous polyester in this invention, it is preferable to use terephthalic acid, its lower ester, diphenylacetic acid, cyclohexane dicarboxylic acid, etc. The lower ester means an ester of an aliphatic alcohol having 1 to 8 carbon atoms.
As the polyhydric alcohol used for obtaining the amorphous polyester in the present invention, among the polyhydric alcohols, in particular, polytetramethylene glycol, bisphenol A, bisphenol Z, hydrogenated bisphenol A, cyclohexanedimethanol, And it is preferable to use these alkylene oxide adducts.

  In order to produce one type of polycondensation resin, each of the polyvalent carboxylic acid and polyol may be used alone or in combination of two or more, each of which may be used alone or in combination of two or more. You may use each. Moreover, when using hydroxycarboxylic acid in order to produce 1 type of polycondensation resin, 1 type may be used individually, 2 or more types may be used, and polyvalent carboxylic acid and a polyol may be used together.

  Control of the glass transition temperature is mainly determined by how densely rigid units such as aromatic rings and cyclohexane rings are incorporated in the main chain repeating units of the polycondensation resin, and in addition, side chains such as aliphatic groups. Increasing the density decreases the glass transition temperature. That is, if the density of methylene group, ethylene group, oxyethylene group or the like in the main chain is high, the glass transition temperature is lowered, and if the number of aromatic rings or cyclohexane rings is increased, it is raised. By considering these, polycondensation resins having various glass transition temperatures can be obtained.

In the polycondensation reaction for producing the polycondensation resin, the reaction rate can be increased, and therefore a polycondensation catalyst is preferably used. In the electrostatic image developing toner (B), as in the case of the electrostatic image developing toner (A), the reaction temperature during polycondensation is preferably 150 ° C. or less, and preferably 70 to 150 ° C. More preferably, it is 70-140 degreeC, It is further more preferable that it is 80-140 degreeC.
The reaction time during polycondensation depends on the reaction temperature, but is preferably 0.5 to 72 hours, more preferably 1 to 48 hours.
Examples of the polycondensation catalyst having catalytic activity at a low temperature include the sulfur acid, metal catalyst, other acid catalyst, other rare earth-containing catalyst, or hydrolase used in the production of the electrostatic image developing toner (A). Etc. can be illustrated. Among these, it is preferable to use sulfur acid.

  The total amount of catalyst added is preferably 0.01 to 10% by weight, more preferably 0.01 to 8% by weight, based on the polycondensation component. One type of catalyst can be used alone, or two or more types can be used in combination.

The polycondensation resin can be produced by a known polycondensation method such as underwater polymerization such as bulk polymerization, emulsion polymerization or suspension polymerization, solution polymerization, interfacial polymerization, etc., but the bulk polymerization method is preferably used. be able to. Although the reaction can be performed under atmospheric pressure, general conditions such as reduced pressure and nitrogen flow can be widely used for the purpose of increasing the molecular weight of a polycondensation resin such as polyester. As conditions for the polycondensation, the same conditions as in the production of the electrostatic image developing toner (A) described above can be used.
In the electrostatic charge image developing toner (B), as in the electrostatic charge image developing toner (A), other binder resins such as addition polymerization resins can be used.

(2) Colorant There is no restriction | limiting in particular as a colorant which can be used for this invention, A well-known colorant is mentioned, It can select suitably according to the objective. One colorant may be used alone, or two or more colorants of the same system may be mixed and used. Further, two or more kinds of different colorants may be mixed and used. Further, these colorants may be used after surface treatment.
Examples of the colorant include those similar to those used in the electrostatic image developing toner (A), and can be used in the same manner as in the electrostatic image developing toner (A).

  The colorant is preferably added in the range of 4 to 15% by weight, preferably in the range of 4 to 10% by weight, based on the total solid content of the toner, in order to ensure color developability at the time of fixing. Is more preferable. However, when a magnetic material is used as the black colorant, it is preferably added in the range of 12 to 48% by weight, and more preferably in the range of 15 to 40% by weight.

(3) Release agent A release agent may be added to the core of the electrostatic image developing toner (B) of the present invention, if necessary. The release agent is generally used for the purpose of improving the releasability. Examples of the release agent include those similar to those used in the electrostatic image developing toner (A), and can be used in the same manner as in the electrostatic image developing toner (A).
The amount of these release agents added is preferably 1 to 20% by weight, more preferably 5 to 15% by weight, based on the total amount of toner particles. Within the above range, the effect of the release agent is sufficient, and the toner particles are not easily destroyed inside the developing machine, so the spent of the release agent to the carrier does not occur, and the charge is difficult to decrease. .

(4) Flocculant When the emulsion aggregation coalescence method is used in the production of the toner in the present invention, agglomeration is caused by pH change in the agglomeration step, and particles can be prepared. At the same time, an aggregating agent may be added in order to stably and rapidly aggregate the particles, or to obtain aggregated particles having a narrower particle size distribution. The aggregating agent may be the same as that used in the electrostatic image developing toner (A), and may be used in the same manner as in the electrostatic image developing toner (A).
The amount of the flocculant added varies depending on the valence of the charge, but all of them are small, and in the case of monovalent, about 3% by weight or less with respect to the total amount of toner, and in the case of divalent, about 1% by weight or less. In the case of trivalent, it is about 0.5% by weight or less. Since the amount of the flocculant is preferably small, it is preferable to use a compound having a large valence.

(5) Other additives For the electrostatic charge image developing toner (B), additives such as a charge control agent, a magnetic substance, and an internal additive, as required, similar to the electrostatic charge image developing toner (A). Can be used.

2. About outer shell (1) Resin contained in outer shell The electrostatic image developing toner (B) of the present invention has a core and an outer shell, and the core is obtained by agglomerating resin particles having a core-shell structure. The glass transition temperature of the resin contained in the outer shell is a value between the glass transition temperature of the resin contained in the core and the glass transition temperature of the resin contained in the shell. .

  As the electrostatic image developing toner (B) for heat and pressure fixing of the present invention, the same outer shell as that used for the electrostatic image developing toner (A) can be used, and the outer shell is made of only amorphous polyester. Those consisting of are preferred.

(2) External additive To the electrostatic charge image developing toner (B) of the present invention, an external additive such as a fluidizing agent or a charge control agent may be added, and the electrostatic charge image developing toner (A). External additives similar to those used in the above can be used.

3. In the present invention, the Tg of the resin contained in the outer shell and the glass transition temperature of the resin contained in the core are the same as the glass transition temperature of the resin contained in the core and the resin contained in the shell. It is a value between the glass transition temperature. That is, the resin contained in the outer shell has a glass transition temperature between the glass transition temperature of the high Tg phase and the glass transition temperature of the low Tg phase forming the core and the shell.
Since the glass transition temperature of the high Tg phase is preferably 45 to 80 ° C. as described above, the upper limit of the glass transition temperature of the resin contained in the outer shell is lower than the glass transition temperature of the high Tg phase. The temperature is preferably less than 80 ° C, and more preferably less than 60 ° C.
The glass transition temperature of the outer shell is higher than the glass transition temperature of the low Tg phase, preferably 40 ° C. or higher, and more preferably 50 ° C. or higher.
Within the above numerical range, the storage stability and fixability of the electrostatic image developing toner are excellent.

  Further, the acid value of the whole resin contained in the outer shell is preferably higher than the acid value of the whole resin contained in the core, preferably 3-50 (KOHmg / g), and 10-30 (KOHmg / G) is more preferable. Within the range of the above numerical values, an electrostatic charge image developing toner excellent in storage stability can be obtained because the resin serving as the material of the outer shell is likely to come out at the interface between water and resin particles, and the production stability is also excellent. Here, the acid value is measured according to JIS K0070.

I-3. Shapes of electrostatic image developing toner (A) and electrostatic image developing toner (B) Cumulative volume average particle size D ₅₀ of electrostatic image developing toners (A) and (B) of the present invention is 3.0 to It is preferably in the range of 15 μm, more preferably in the range of 3.0 to 10.0 μm. Within the above numerical range, the fixing property is excellent, the developing property is good, and the image resolution is excellent.

  The volume average particle size distribution index GSDv of the toner of the present invention is preferably 1.30 or less. When GSDv is 1.30 or less, the resolution is good, toner scattering, fogging and the like are unlikely to occur, and image defects are unlikely to occur.

The average particle size distribution index cumulative volume-average particle diameter D ₅₀ and the toner of the present invention, for example, (manufactured by Beckman Coulter, Inc.) Coulter Counter TAII, measured in Multisizer II (manufactured by Beckman Coulter, Inc.) instrument For the particle size range (channel) divided based on the particle size distribution, draw the cumulative distribution from the small diameter side for the volume and number, respectively, and the particle size to be 16% is the volume D _16v , number D _16P , 50% cumulative _{Are defined} as a volume D _50v and a number D _50P , and a particle size at a cumulative 84% is defined as a volume D _84v and a number D _84P . Using these, the volume average particle size distribution index (GSDv) is calculated as (D _84v / D _16V ) ^1/2 and the number average particle size distribution index (GSDp) is calculated as (D _84P / D _16P ) ^1/2 .

The toner shape factor SF1 is preferably in the range of 110 to 140, more preferably 120 to 140. It is well known that spherical toner is more easily transferred in the transfer process in the electrophotographic process, and that irregular toner is easier to clean in the cleaning process.
SF1 is a shape factor indicating the degree of unevenness on the toner particle surface, and is calculated as follows. The toner shape factor SF1 is obtained by taking an optical microscope image of toner dispersed on a slide glass into a Luzex image analyzer through a video camera, and calculating the square of the maximum length of toner particles per 50 toner particles / projection area ((ML)). ² / A), SF1 of the following formula is calculated, and the average value is obtained.

式中、ＭＬはトナー粒子の最大長を示し、Ａは粒子の投影面積を示す。

In the formula, ML represents the maximum length of toner particles, and A represents the projected area of the particles.

II. Method for producing toner for developing electrostatic image II-1. Method for Producing Toner for Electrostatic Image Development (A) In the present invention, the method for producing the toner for electrostatic image development (A) for heat and pressure fixing is carried out by using a block having a crystalline polyester block and an amorphous polyester block. A dispersion step of dispersing resin particles containing a polymer (hereinafter also referred to as “block copolymer resin particles”) in an aqueous medium, an agglomeration step of aggregating the dispersed resin particles to obtain agglomerated particles serving as a core, Resin particles having a glass transition temperature between the glass transition temperature of the crystalline polyester block and the glass transition temperature of the non-crystalline polyester block are added, and the resin particles are aggregated and adhered to the surface of the aggregated particles to form an outer shell. It is preferable to include an outer shell forming step to be performed, and a fusion step in which the aggregated particles having the outer shell obtained in the outer shell forming step are fused by heating.

In the method for producing an electrostatic charge image developing toner (A), if necessary, a colorant may be added to a dispersion containing block copolymer resin particles and release agent particles containing at least a crystalline polyester block and an amorphous polyester block. Particles containing particles (if the colorant has been added to the resin in advance in the polycondensation step or the like in itself), other resin particles, or dispersions thereof may be added. .
The method for producing an electrostatic charge image developing toner (A) of the present invention is a known aggregation method in which the block copolymer resin particles, release agent particles and other added particles in the dispersion are aggregated (aggregated). It is possible to adjust the toner particle size and the particle size distribution by agglomerating (associating) with each other and forming an outer shell.
Specifically, the block copolymer resin particle dispersion and the release agent particle dispersion are mixed with a colorant particle dispersion and the like, and further, an aggregating agent is added to cause heteroaggregation, thereby aggregating particles having a toner diameter. And then heated to a temperature not lower than the glass transition temperature of the resin particles or higher than the melting point to fuse and coalesce the aggregated particles, and are washed and dried. In this manufacturing method, the toner shape can be controlled from an indeterminate shape to a spherical shape by selecting a heating temperature condition.

1. Dispersion Step In order to obtain a block copolymer resin particle dispersion, the block copolymer is preferably dispersed in an aqueous medium, and can be dispersed by any known method. For example, it can be emulsified or dispersed using a mechanical shear such as a homogenizer or ultrasonic waves.

  The block copolymer resin particle dispersion may contain additives such as a surfactant, a polymer dispersant, and an inorganic dispersant, and the surfactant or polymer may be added as necessary during the above dispersion. It is also possible to add a dispersant, an inorganic dispersant and the like to the aqueous medium.

  Examples of the aqueous medium include water such as distilled water and ion-exchanged water, alcohols such as ethanol and methanol, a mixture of water-miscible organic solvents such as acetone and acetic acid, and water. Or a mixture of ethanol and water is preferable, and water such as distilled water and ion-exchanged water is more preferable. These may be used individually by 1 type and may use 2 or more types together.

Examples of the surfactant that can be used in the present invention include anionic surfactants such as sulfate ester, sulfonate, and phosphate ester, and cationic surfactants such as amine salt type and quaternary ammonium salt type. And nonionic surfactants such as polyethylene glycol-based, alkylphenol ethylene oxide adduct-based and polyhydric alcohol-based agents. Among these, anionic surfactants and cationic surfactants are preferable.
The said surfactant may be used individually by 1 type, and may use 2 or more types together. The nonionic surfactant is preferably used in combination with the anionic surfactant or the cationic surfactant.

  Anionic surfactants include sodium dodecylbenzenesulfonate, sodium alkylnaphthalenesulfonate, sodium arylalkylpolyethersulfonate, 3,3′-disulfonediphenylurea-4,4′-diazo-bis-amino-8-naphthol Sodium 6-sulfonate, ortho-carboxybenzene-azo-dimethylaniline, 2,2 ′, 5,5′-tetramethyl-triphenylmethane-4,4′-diazo-bis-β-naphthol-6-sulfone Sodium sulfate, sodium dialkylsulfosuccinate, sodium dodecyl sulfate, sodium tetradecyl sulfate, sodium pentadecyl sulfate, sodium octyl sulfate, sodium oleate, sodium laurate, sodium caprate, sodium caprylate, Sodium prong, potassium stearate and calcium oleate and the like.

  Examples of the cationic surfactant include alkylbenzene dimethyl ammonium chloride, alkyl trimethyl ammonium chloride, and distearyl ammonium chloride.

  Nonionic surfactants include polyethylene oxide, polypropylene oxide, a combination of polypropylene oxide and polyethylene oxide, esters of polyethylene glycol and higher fatty acids, alkylphenol polyethylene oxide, esters of higher fatty acids and polyethylene glycol, higher fatty acids and polypropylene. Examples include esters with oxides and sorbitan esters.

Examples of the polymer dispersant include sodium polycarboxylate and polyvinyl alcohol, and examples of the inorganic dispersant include calcium carbonate. However, these do not limit the present invention.
Further, usually, in order to prevent the Ostwald Ripping phenomenon of monomer emulsion particles in an aqueous medium, higher alcohols typified by heptanol and octanol and higher aliphatic hydrocarbons typified by hexadecane are often used as stabilizing aids. It is also possible to mix.

2. Aggregation step The aggregation step refers to a step of aggregating dispersed resin particles or the like to obtain agglomerated particles serving as a core.
The aggregating method in the aggregating step is not particularly limited, and the aggregating method conventionally used in the emulsion polymerization aggregating method of electrostatic charge image developing toner, for example, by raising the temperature, changing the pH, adding the aggregating agent, etc. A method of reducing the stability of the emulsion and stirring with a disperser or the like is used. As the aggregating agent, the aggregating agent can be used. In particular, when a metal salt is used, it is preferable in characteristics such as cohesion control and toner chargeability.

In the agglomeration step, any one or more of a resin particle dispersion other than the block copolymer resin particle dispersion, the colorant dispersion, the release agent dispersion, and the additive and the block copolymer resin are used. It is also possible to mix the particle dispersion and carry out the aggregation process and thereafter.
At that time, after the block copolymer resin particles are aggregated in advance and the first aggregated particles are formed, a block copolymer resin particle dispersion or another resin particle dispersion is further added to the surface of the first aggregated particles. It is also possible to make particles multi-layered, for example, by forming a shell layer. Of course, it is also possible to produce multilayer particles in the reverse order of the above example.
Further, for example, in the aggregation step, the block copolymer resin particle dispersion and the colorant particle dispersion are aggregated in advance, and after the formation of the first aggregated particles, the resin particle dispersion further containing the block copolymer or another resin It is also possible to add a particle dispersion to form a second layer on the surface of the first particles. In this illustration, the colorant dispersion is prepared separately, but naturally the colorant may be blended in advance with the block copolymer in the present invention.
In the present invention, resin particle dispersions other than block copolymer resin particle dispersions such as addition polymerization resin particle dispersions prepared by using conventionally known emulsion polymerization can also be used.

  In preparing the toner in the present invention, when polycondensation resin particles are polycondensed in an aqueous medium, a colorant, a release agent, an additive and the like are mixed in advance in the aqueous medium, and the resin is used together with the polycondensation. It is also possible to mix in the particles.

3. Outer shell forming step In the outer shell forming step, resin particles having a glass transition temperature between the glass transition temperature of the crystalline polyester block and the glass transition temperature of the non-crystalline polyester block are added to the surface of the aggregated particles. It refers to a step of forming resin shells by agglomerating and adhering resin particles.
The outer shell can be formed by further adding a resin particle dispersion forming the outer shell to the dispersion containing the aggregated particles obtained in the aggregation step.

4). Fusion process The fusion process refers to a process in which the agglomerated particles having the outer shell obtained in the outer shell forming process are heated and fused. In the fusing step, the aggregated particles and the resin in the outer shell melt at a temperature condition equal to or higher than the melting point or glass transition temperature, and the aggregated particles change from an indeterminate shape to a more spherical shape. Thereafter, the aggregate is separated from the aqueous medium, and washed and dried as necessary to form toner particles.

5. Other Steps After completing the coalesced particle fusion step, the desired toner particles are obtained through an optional washing step, solid-liquid separation step, and drying step. Replacement cleaning is desirable. Moreover, although there is no restriction | limiting in particular in a solid-liquid separation process, From the point of productivity, suction filtration, pressure filtration, etc. are suitable. Further, the drying process is not particularly limited, but freeze drying, flash jet drying, fluidized drying, vibration fluidized drying and the like are preferably used from the viewpoint of productivity.

II-2. Method for Producing Toner (B) for Developing Electrostatic Image The method for producing toner (B) for developing electrostatic image has the difference between the glass transition temperature of the resin contained in the core and the glass transition temperature of the resin contained in the shell. A dispersion step of dispersing resin particles having a core-shell structure at 20 ° C. or higher (hereinafter also referred to as “core-shell particles”) in an aqueous medium, an aggregation step of aggregating the dispersed resin particles to obtain agglomerated particles serving as a core Add resin particles having a glass transition temperature between the glass transition temperature of the resin contained in the core and the glass transition temperature of the resin contained in the shell, and agglomerate and adhere the resin particles on the surface of the aggregated particles. It is preferable to include an outer shell forming step for forming the outer shell, and a fusion step for heating and coalescing the aggregated particles having the outer shell obtained in the outer shell forming step.

1. Dispersion step The dispersion step is a step of dispersing the core-shell particles having a core-shell structure in which the difference between the glass transition temperature of the resin contained in the core and the glass transition temperature of the resin contained in the shell is 20 ° C or higher in an aqueous medium. Say.
In the dispersion step, a core-shell particle dispersion, a release agent particle dispersion, a colorant particle dispersion and other binder resin particle dispersions are separately prepared as necessary, and these are mixed to obtain a core-shell. It is preferable to disperse the particles and release agent particles in an aqueous medium.
As a method for producing the core-shell particle dispersion, two resins having different glass transition temperatures of 20 ° C. or more and SP values of 0.2 or more or two resins having different acid values of 5 or more are mixed, A method of forming particles by emulsification and dispersion in an aqueous medium is preferred.

The method for dispersing and granulating the resin in the aqueous medium can be selected from known methods such as forced emulsification, self-emulsification, and phase inversion emulsification. Of these, the self-emulsification method and the phase inversion emulsification method are preferably applied in consideration of the energy required for emulsification, the particle size controllability of the obtained emulsion, stability, and the like.
The self-emulsification method and the phase inversion emulsification method are described in “Applied Technology of Ultrafine Particle Polymer (CMC Publishing Co., Ltd.)”. As the polar group used for self-emulsification, a carboxy group, a sulfone group and the like can be used.

2. Aggregation Step As the aggregation method in the aggregation step, aggregated particles that form the core of the electrostatic image developing toner (B) are formed by the same steps as the aggregation step in the production method of the electrostatic image developing toner (A). Can do.
In the aggregation step, it is possible to mix two or more types of core-shell particle dispersions and one or more other binder resin particle dispersions, and to perform the steps after the aggregation. At that time, after the resin particle dispersion is agglomerated in advance to form the first agglomerated particles, another binder resin particle dispersion is further added to form the second shell layer on the surface of the first agglomerated particles, etc. It is also possible to multilayer the particles. Naturally, it is also possible to produce multilayer particles in the reverse order of the above example.

3. Outer shell formation step The outer shell formation step is the addition of resin particles having a glass transition temperature between the glass transition temperature of the resin contained in the core and the glass transition temperature of the resin contained in the shell, and the aggregation This refers to a step of agglomerating and adhering resin particles to the surface of the particles to form an outer shell, which can be performed in the same manner as the outer shell forming step in the method for producing the electrostatic image developing toner (A).

4). Fusion process The fusion process refers to a process in which the agglomerated particles having the outer shell obtained in the outer shell forming process are heated and fused.
In the fusing step, the resin in the aggregated particles melts under a temperature condition equal to or higher than its melting point or glass transition temperature, and the aggregated particles change from an irregular shape to a more spherical shape. Thereafter, the aggregate is separated from the aqueous medium, and washed and dried as necessary to form toner particles.
In order to maintain the phase separation structure in the toner by the core-shell particles, it is necessary to melt the resin used for the shell under a condition within + 50 ° C. of the glass transition temperature of the resin. If the fusion is performed at an excessively high temperature, the core components may be reduced in viscosity due to a decrease in the viscosity of the core component, so that the micro phase separation structure cannot be maintained, and the pressure plastic behavior may be insufficient.

  After the dispersion step, the aggregation step, and the fusion step, a desired toner may be obtained through an arbitrary washing step, solid-liquid separation step, and drying step. The washing step, the solid-liquid separation step, and the drying step are as described in the method for producing the electrostatic image developing toner (A).

  Further, in the method for producing an electrostatic charge image developing toner of the present invention, it is preferable to avoid mixing at high temperature and high pressure in order not to break the phase separation structure of the core-shell particles.

III. Electrostatic Image Developer The electrostatic image developing toner (A) and the electrostatic image developing toner (B) of the present invention can be used as an electrostatic image developer. This electrostatic charge image developer is not particularly limited except that it contains the toner for developing an electrostatic charge image of the present invention, and can have an appropriate component composition depending on the purpose. When the electrostatic image developing toner is used alone, it is prepared as a one-component electrostatic image developer, and when used in combination with a carrier, it is prepared as a two-component electrostatic image developer.

  The carrier that can be used in the present invention is not particularly limited. Usually, magnetic particles such as iron powder, ferrite, iron oxide powder, and nickel; magnetic particles are used as a core material, and the surface is a styrene resin or vinyl resin. Resin-coated carrier formed by coating resin, ethylene-based resin, rosin-based resin, polyester-based resin, melamine-based resin, etc., or wax such as stearic acid, and forming a resin coating layer, magnetic particles in binder resin And a magnetic material-dispersed carrier in which is dispersed. Among them, the resin-coated carrier is particularly preferable because the chargeability of the toner and the resistance of the entire carrier can be controlled by the configuration of the resin coating layer.

  The mixing ratio of the toner of the present invention and the carrier in the two-component electrostatic image developer is usually preferably 2 to 10 parts by weight of the toner with respect to 100 parts by weight of the carrier. Moreover, the preparation method of a developing agent is not specifically limited, For example, the method of mixing with a V blender etc. is mentioned.

IV. Image Forming Method An image forming method of the present invention comprises a latent image forming step for forming an electrostatic latent image on the surface of the latent image holding member, and the electrostatic latent image formed on the surface of the latent image holding member is used as an electrostatic image developing toner. Or a developing step of forming a toner image by developing with an electrostatic charge image developer containing the toner and a carrier, a transferring step of transferring the toner image formed on the surface of the latent image holding member to the surface of the transfer target, and the above A heat and pressure fixing step of fixing the toner image transferred to the surface of the transfer medium by heating and pressing, wherein the electrostatic image developing toner is the electrostatic image developing toner of the present invention, and the electrostatic image development The agent is the electrostatic charge image developer of the present invention, and the fixing pressure in the fixing step is 1 to 50 MPa.

As the image forming method of the present invention, an electrostatic charge image developer is prepared using the specific toner as described above, and an electrostatic charge image is formed and developed by a conventional electrophotographic copying machine using the developer. The transferred toner image is electrostatically transferred onto the transfer paper, and is fixed by a heating roller fixing machine in which the temperature of the upper heating roller is set to a constant temperature to form a copy image.
The image forming method of the present invention is particularly preferably used when performing high-speed fixing such that the contact time between the toner on the transfer paper and the heating roller is within 1 second, particularly within 0.5 seconds.

  In addition, the electrostatic image developer containing the electrostatic image developing toner of the present invention can be used in an ordinary electrostatic image developing system (electrophotographic system) image forming method. Specifically, the image forming method of the present invention includes, for example, an electrostatic latent image forming step, a toner image forming step, a transfer step, and a cleaning step. Each of the above steps is a general step per se, and is described in, for example, JP-A-56-40868 and JP-A-49-91231. The image forming method of the present invention can be carried out using an image forming apparatus such as a copier or a facsimile machine known per se.

The electrostatic latent image forming step is a step of forming an electrostatic latent image (electrostatic charge image) on the electrostatic latent image carrier. The toner image forming step is a step of developing the electrostatic latent image with a developer layer on a developer carrier to form a toner image. The developer layer is not particularly limited as long as it contains the electrostatic image developer of the present invention containing the electrostatic image developing toner of the present invention. The transfer step is a step of transferring the toner image onto a transfer body. The cleaning step is a step of removing the electrostatic charge image developer remaining on the electrostatic latent image carrier.
In the image forming method of the present invention, an embodiment that further includes a recycling step is preferable. The recycling step is a step of transferring the electrostatic image developing toner collected in the cleaning step to the developer layer. The image forming method including the recycling step can be performed using an image forming apparatus such as a toner recycling system type copying machine or facsimile machine. The present invention can also be applied to a recycling system in which the cleaning process is omitted and toner is collected simultaneously with development.

The maximum pressure during image fixing in the image forming method of the present invention is preferably 1 to 10 MPa.
If the maximum pressure during fixing is 1 MPa or more, sufficient thick paper fixing properties can be obtained, and if it is 10 MPa or less, the hot offset temperature is good, the image is stained, the fixing roll is contaminated, and the paper is wound. It is preferable because it is difficult to curl and paper curl is unlikely to occur. Note that the paper curl is a state in which the paper after fixing is greatly bent.

  The pressure distribution between the fixing roll and the pressure roll can be measured by a commercially available pressure distribution measuring sensor, and specifically can be measured by a pressure measuring system between rollers manufactured by Iwata Industry Co., Ltd. In the present invention, the maximum pressure at the time of pressure fixing represents the maximum value in the change in pressure from the fixing nip entrance to the exit in the sheet traveling direction.

As the transfer medium that can be used in the image forming method of the present invention, for example, plain paper, cardboard, OHP sheet, coated paper whose surface is coated with resin, art paper for printing, etc. are preferably used. can do. Further, it is preferable to use a cardboard as the transfer target since the effects of the present invention can be remarkably exhibited.
In addition, a thick paper means the paper which is 90 g / m < ² > or more.
The image forming method of the present invention is a particularly excellent method for forming an image on cardboard, and is preferable because high-speed fixing using cardboard can reduce fixing energy while achieving both high image quality and reliability.
In addition to excellent image formation on cardboard, the present invention exhibits effective performance without problems for plain paper having a basis weight of less than 90 g / m ² , reducing fixing energy, or the same energy The image forming speed per hour can be improved.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited at all. In the following description, “parts” means “parts by weight” and “%” means “% by weight” unless otherwise specified.

I. Toner for electrostatic image development (A)
1. Preparation of electrostatic image developing toner (1) Preparation of resin particle dispersion (preparation of resin particle dispersion (1))
1,4-cyclohexanedicarboxylic acid 175 parts Bisphenol A ethylene oxide 2-mole adduct 310 parts Dodecylbenzenesulfonic acid 0.5 parts The above materials are mixed, put into a reactor equipped with a stirrer, and 5% at 120 ° C under a nitrogen atmosphere. When time polycondensation was carried out, a uniform transparent amorphous polyester resin was obtained.
The weight average molecular weight by GPC was 7,500, and the glass transition temperature (onset) was 60 ° C.

Caprolactone 90 parts Dodecylbenzenesulfonic acid 0.2 parts The above materials were mixed, put into a reactor equipped with a stirrer, and subjected to polycondensation in a nitrogen atmosphere at 90 ° C for 5 hours. Obtained.
The weight average molecular weight by GPC was 4,000, and the crystal melting point was 60 ° C. The glass transition temperature was −60 ° C.

Further, the above two resins were mixed at 100 ° C. and heated in a reactor equipped with a stirrer for 5 hours to form a block copolymer.
The glass transition temperature (onset) by DSC as a block copolymer was 53 ° C., and the melting point was observed as small as around 60 ° C.
Moreover, the weight average molecular weight by GPC was 12,000.

To 100 parts of this resin, 0.5 part of soft sodium dodecylbenzenesulfonate is added as a surfactant, 300 parts of ion-exchanged water is further added, and the mixture is heated at 80 ° C. in a round glass flask with a homogenizer (manufactured by IKA). And Ultra-Turrax T50).
Thereafter, the pH of the system is further adjusted to 5.0 with a 0.5 mol / liter sodium hydroxide aqueous solution, and then heated to 90 ° C. while continuing to stir with a homogenizer, and then an emulsion dispersion of a block copolymer resin. Got. A resin particle dispersion (1) having a resin particle center diameter of 220 nm and a solid content of 20% by weight was obtained. The acid value of the resin particles was 10 mgKOH / g.

(Preparation of resin particle dispersion (2))
1,4-cyclohexanedicarboxylic acid 175 parts Bisphenol A ethylene oxide 2-mole adduct 310 parts Dodecylbenzenesulfonic acid 0.5 parts The above materials are mixed, put into a reactor equipped with a stirrer, and 5% at 120 ° C under a nitrogen atmosphere. When time polycondensation was carried out, a uniform transparent amorphous polyester resin was obtained. The weight average molecular weight by GPC was 7,500, and the glass transition temperature (onset) was 65 ° C.

Dodecylbenzenesulfonic acid 0.36 parts 1,9-nonanediol 80 parts 1,10-decamethylenedicarboxylic acid 115 parts The above materials are mixed, heated at 120 ° C. and melted, then held at 80 ° C. for 3 hours, A crystalline polyester resin having a weight average molecular weight of 5,500 by GPC and a crystal melting point of 62 ° C. was obtained. The glass transition temperature was −50 ° C.

Further, the above two resins were mixed at 100 ° C. and heated for 5 hours in a reactor equipped with a stirrer to form a block copolymer.
The glass transition temperature (onset) by DSC as a block copolymer was 52 ° C., and the melting point was observed around 60 ° C. The weight average molecular weight by GPC was 14,600.

To 100 parts of this resin, 0.5 part of soft sodium dodecylbenzenesulfonate is added as a surfactant, 300 parts of ion exchange water is further added, heated to 80 ° C., and heated in a round glass flask. The mixture was sufficiently mixed and dispersed with a homogenizer (IKA, Ultra Turrax T50).
Thereafter, the pH of the system is further adjusted to 5.0 with a 0.5 mol / liter sodium hydroxide aqueous solution, and then heated to 90 ° C. while continuing to stir with a homogenizer to emulsify the resin particles of the block copolymer resin. A dispersion was obtained. A resin particle dispersion (2) having a resin particle center diameter of 200 nm and a solid content of 20% by weight was obtained. The acid value of the resin particles was 11 mgKOH / g.

(Preparation of resin particle dispersion (3))
1,4-phenylenedipropanoic acid 222 parts Bisphenol A propylene oxide 2 mol adduct 344 parts p-toluenesulfonic acid 0.7 parts When polycondensation was carried out for 5 hours, a uniform transparent amorphous polyester resin was obtained. The weight average molecular weight by GPC was 5,000, and the glass transition temperature (onset) was 63 ° C.

Dodecylbenzenesulfonic acid 0.36 parts 1,9-nonanediol 80 parts 1,10-decamethylenedicarboxylic acid 115 parts The above materials are mixed, heated at 120 ° C. and melted, then held at 80 ° C. for 3 hours, GPC A crystalline polyester resin having a weight average molecular weight of 5,500 and a crystal melting point of 62 ° C. was obtained. The glass transition temperature was −50 ° C.

  Further, the above two resins were mixed at 100 ° C. and heated for 5 hours in a reactor equipped with a stirrer to form a block copolymer. The glass transition temperature (onset) by DSC as a block copolymer was 50 ° C., and the melting point was observed around 60 ° C. The weight average molecular weight by GPC was 13,000.

To 100 parts of this resin, 0.5 part of soft sodium dodecylbenzenesulfonate is added as a surfactant, 300 parts of ion exchange water is further added, heated to 80 ° C., and heated in a round glass flask. The mixture was sufficiently mixed and dispersed with a homogenizer (IKA, Ultra Turrax T50).
Thereafter, the pH of the system is further adjusted to 5.0 with a 0.5 mol / liter sodium hydroxide aqueous solution, and then heated to 90 ° C. while continuing to stir with a homogenizer to emulsify the resin particles of the block copolymer resin. A dispersion was obtained. A resin particle dispersion (3) having a resin particle center diameter of 200 nm and a solid content of 20% by weight was obtained. The acid value of the resin particles was 12 mgKOH / g.

(Preparation of resin particle dispersion (4))
In the preparation of the resin particle dispersion (1), the polymerization time was extended by 3 hours using only 1,4-cyclohexanedicarboxylic acid, bisphenol A ethylene oxide 2-mole adduct, and dodecylbenzenesulfonic acid without adding crystalline polyester resin. , An amorphous polyester resin having a Mw of 12,000 (Tg 54 ° C.) To 100 parts of this resin, 0.5 part of soft sodium dodecylbenzenesulfonate is added as a surfactant, 300 parts of ion-exchanged water is further added, and the mixture is heated at 80 ° C. in a round glass flask with a homogenizer (manufactured by IKA). And Ultra-Turrax T50).
Thereafter, the pH of the system is further adjusted to 5.0 with a 0.5 mol / liter sodium hydroxide aqueous solution, and then heated to 90 ° C. while continuing to stir with a homogenizer, and then an emulsion dispersion of a block copolymer resin. Got.
A resin particle dispersion (4) having a resin particle central diameter of 210 nm and a solid content of 20% by weight was obtained. The glass transition temperature of the resin particles was 54 ° C. The acid value was 10 mgKOH / g.

(2) Preparation of colorant particle dispersion (preparation of colorant particle dispersion (P1))
Cyan pigment (Daiichi Seika Kogyo Co., Ltd., copper phthalocyanine CI Pigment Blue 15: 3) 50 parts Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen R) 5 parts Ion-exchanged water 200 parts The above components were mixed and dissolved, and dispersed for 5 minutes by a homogenizer (manufactured by IKA, Ultra Turrax) and for 10 minutes by an ultrasonic bath. A cyan colorant particle dispersion (P1) having a center diameter of 190 nm and a solid content of 21.5% by weight. )

(Preparation of colorant particle dispersion (P2))
In the preparation of the colorant particle dispersion liquid (P1), it was prepared in the same manner as the colorant particle dispersion liquid (P1), except that a magenta pigment (manufactured by Dainippon Ink & Chemicals, Inc., PR122) was used instead of the cyan pigment. Thus, a magenta colorant particle dispersion (P2) having a center diameter of 165 nm and a solid content of 21.5% by weight was obtained.

(3) Preparation of release agent particle dispersion (preparation of release agent particle dispersion (W1))
30 parts of dodecyl sulfuric acid 852 parts of ion-exchanged water The above components were mixed to prepare an aqueous dodecyl sulfuric acid solution.
Palmitic acid 188 parts Pentaerythritol 25 parts The above ingredients were mixed, heated to 250 ° C and melted, then poured into the above-mentioned aqueous dodecyl sulfate solution, emulsified with a homogenizer (manufactured by IKA, Ultra Tarrax) for 5 minutes, and further After emulsification in an ultrasonic bath for 15 minutes, the emulsion was maintained at 70 ° C. in a flask while stirring and held for 15 hours.
As a result, a release agent particle dispersion (W1) having a particle central diameter of 200 nm, a melting point of 72 ° C., and a solid content of 20% by weight was obtained.

(Preparation of release agent particle dispersion (W2))
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen R) 2 parts Ion-exchange water 800 parts Carnauba wax 200 parts The mixture was emulsified with an ultra turrax for 15 minutes, and further emulsified at 100 ° C. using a gorin homogenizer.
As a result, a release agent particle dispersion (W2) having a particle central diameter of 170 nm, a melting point of 83 ° C., and a solid content of 20% by weight was obtained.

(4) Preparation of resin particle dispersion for outer shell (Preparation of resin particle dispersion for outer shell (S1))
Bisphenol A propylene oxide 2.2 mol adduct 77.4 parts Bisphenol A ethylenelen oxide 2.2 mol adduct 33.2 parts Terephthalic acid 60.2 parts Trimellitic anhydride 17.2 parts Dodecenyl succinic anhydride 12.2 Part Dibutyltin n-oxide 0.4 part Put these materials in a stainless steel flask, attach a thermometer, stainless steel stirring blade, flow-down condenser, and nitrogen inlet tube, raise the temperature to 230 ° C with a mantle heater, and in a nitrogen stream The mixture was allowed to react for 8 hours under reduced pressure while stirring. As a result, an amorphous polyester resin A having a glass transition temperature of 50 ° C. and a weight average molecular weight of 15,000 was obtained.

After 200 parts of this non-crystalline polyester resin A was dissolved in 200 parts of ethyl acetate, the mixture was charged and emulsified with stirring with ultra turrax in 800 parts of ion-exchanged water containing 0.5% by weight of sodium dodecyl sulfate. The solvent was removed by heating to 60 ° C.
As a result, an outer shell resin particle dispersion (S1) having a median diameter of 140 nm, a glass transition temperature of 50 ° C., and a solid content of 20% by weight was obtained. The acid value was 14 mgKOH / g.

(5) Preparation of toner for developing electrostatic image (Example 1-1)
(Preparation of toner particles (1))
Resin particle dispersion (1) 315 parts (63 parts of resin)
Colorant particle dispersion (P1) 40 parts (8.6 parts pigment)
40 parts of release agent particle dispersion (W1) (8.6 parts of release agent)
Polyaluminum chloride 0.15 parts Ion-exchanged water 300 parts In accordance with the above formulation, the components were thoroughly mixed and dispersed in a round stainless steel flask with a homogenizer (IKA, Ultra Turrax T50), and then heated in an oil bath. The flask was heated to 42 ° C. with stirring and maintained at 42 ° C. for 60 minutes, and then 105 parts (21 parts of resin) of the outer shell resin particle dispersion (S1) was added and gently stirred.
Thereafter, the pH in the system was adjusted to 6.0 with a 0.5 mol / liter aqueous sodium hydroxide solution, and then heated to 95 ° C. while stirring was continued. During the temperature increase up to 95 ° C, the pH in the system usually drops to 5.0 or less, but here, an aqueous sodium hydroxide solution is added dropwise to keep the pH from dropping to 5.5 or less. did.
After completion of the reaction, the mixture was cooled, filtered, sufficiently washed with ion exchange water, and then solid-liquid separated by Nutsche suction filtration. Then, it was redispersed in 3 liters of ion exchange water at 40 ° C., and stirred and washed at 300 rpm for 15 minutes. This washing operation was repeated 5 times, followed by solid-liquid separation by Nutsche suction filtration, and then vacuum drying for 12 hours to obtain toner particles (1).

When the particle size of the toner particles was measured with a Coulter counter, the cumulative volume average particle size D ₅₀ was 4.5 μm, and the volume average particle size distribution index GSDv was 1.23. Further, the shape factor SF1 of the toner particles obtained from the shape observation by Luzex was 128 potato shapes.

(6) Preparation of electrostatic image developer <Preparation of electrostatic image developer (1)>
To 50 parts of the toner particles (1), 1.5 parts of hydrophobic silica (manufactured by Cabot, TS720) was added and mixed by a sample mill to obtain an externally added toner (1).
A ferrite carrier having an average particle diameter of 50 μm coated with 1% by weight of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd., Mw 75,000) is used, and the externally added toner (1 ) Were weighed, and both were stirred and mixed in a ball mill for 5 minutes to prepare an electrostatic charge image developer (1).

2. Evaluation of toner for developing electrostatic image In the modified machine of DocuCentreColor f450 manufactured by Fuji Xerox Co., Ltd., using the electrostatic image developer (1), the maximum fixing pressure is 1.2 MPa (12 kgf / cm ² ). The two-roll type fixing machine was modified so that
Mirror-coated platinum paper (256 g / m ² ), a thick-coated paper specified by Fuji Xerox Co., Ltd., was used as the transfer paper, and the process speed was adjusted to 180 mm / sec. Fixability is good, and the minimum fixing temperature (this temperature is determined by image contamination by cloth rubbing of the image) is 110 ° C. or higher. The image shows sufficient fixability and gloss uniformity is also good. Met. Both developability and transferability were good, and there was no image defect and a high quality and good image (◯) was shown.
Even at a fixing temperature of 180 ° C., no occurrence of hot offset was observed.
In addition, the above-mentioned modified machine was subjected to a continuous print test of 50,000 sheets in a laboratory environment, and the initial good image quality was maintained until the end (continuous test maintainability ○).
The evaluation of the electrostatic image developing toner (electrostatic image developing agent) was performed according to the following criteria.

a. Minimum Fixing Temperature The minimum fixing temperature was set to the minimum temperature of the heating roller where the fixed image was rubbed with a gauze cloth and no defect in the fixed image occurred.

b. Image quality Image quality was determined as follows by measuring the fine line reproducibility of the image with the fine line fixed and the fog of the non-fixed part with a loupe.
○ ・ ・ ・ There is no unevenness in the fine lines, and there is no fogging. △ ・ ・ ・ There is slight unevenness in image quality. × ・ ・ ・ There is unevenness in image quality.

c. Hot offset generation temperature The offset generation temperature is measured by performing the fixing process with the above-mentioned modified machine, and then sending a blank transfer paper to the fixing machine under the same conditions, and visually confirming whether toner stains are generated or not. The observation operation was repeated while changing the set temperature of the fixing machine, and the lowest set temperature at which contamination with toner occurred was determined as the offset generation temperature.

d. Continuous test maintainability A continuous print test of 50,000 sheets under laboratory conditions (23 ° C., 55% RH) was performed and judged as follows.
○ ・ ・ ・ Good initial image quality was maintained until the end △ ・ ・ ・ Slight image quality degradation was observed × ・ ・ ・ Clear image quality degradation occurred

e. Paper curl ○ ・ ・ ・ Curl is hardly generated △ ・ ・ ・ Curl is slightly generated but recovered over time × ・ ・ ・ Curl not recovered

(Example 1-2)
Except for using the resin particle dispersion (2), the release agent particle dispersion (W1), and the colorant particle dispersion (P2), the electrostatic image developing toner and the electrostatic charge were obtained in the same manner as in Example 1-1. An image developer was prepared and evaluated. The results are shown in Table 1.

(Example 1-3)
Except for using the resin particle dispersion (3), the release agent particle dispersion (W2), and the colorant particle dispersion (P2), the electrostatic image developing toner and the electrostatic A charge image developer was prepared.

In the modified DocuCentreColor f450 manufactured by Fuji Xerox Co., Ltd. using the above-mentioned electrostatic charge image developer, a heating roll is placed on a SUS tube with a Teflon (12 kgf / cm ² ) so that the maximum fixing pressure is 9.5 MPa (12 kgf / cm ² ). The two-roll type fixing machine was modified by changing to a high hardness roll coated with (registered trademark).
Mirror-coated platinum paper (256 g / m ² ), a thick-coated paper specified by Fuji Xerox Co., Ltd., was used as the transfer paper, and the process speed was adjusted to 180 mm / sec. Fixability is good, and the minimum fixing temperature (this temperature is determined by image contamination due to image rubbing and rubbing of the image) is 90 ° C. or higher, and the image exhibits sufficient fixability and gloss uniformity. Met. Both developability and transferability were good, and there was no image defect and a high quality and good image (◯) was shown. Even at a fixing temperature of 180 ° C., no occurrence of hot offset was observed. In addition, the above-mentioned modified machine was subjected to a continuous print test of 50,000 sheets in a laboratory environment, and the initial good image quality was maintained until the end (continuous test maintainability ○).

(Comparative Example 1-2)
A toner was prepared in the same manner as in Example 1-1 except that the resin particle dispersion was changed to (4).

(Comparative Example 1-3)
In Example 1-1, the toner was prepared in the same manner except that the resin particle dispersion (1) (105 parts) was used instead of the outer shell resin particle dispersion (S1) after holding at 42 ° C. for 60 minutes. did.

II. 1. Study of toner (B) for developing electrostatic image Preparation of electrostatic charge image developing toner (B) (1) Preparation of resin particle dispersion (preparation of polycondensation resin (H1): bisphenol A ethylene oxide 2-mole adduct, 1,4-cyclohexanedicarboxylic acid polycondensation resin ( High Tg resin))
1,4-Cyclohexanedicarboxylic acid 175 parts Bisphenol A ethylene oxide 2-mole adduct 320 parts Dodecylbenzenesulfonic acid 0.5 part The above materials are mixed, put into a reactor equipped with a stirrer, and 12 at 120 ° C. under a nitrogen atmosphere. When time polycondensation was carried out, a uniform transparent polyester resin (H1) was obtained.
The weight average molecular weight by GPC was 14,000, and the glass transition temperature was 54 ° C. The acid value was 14.0 mgKOH / g.

(Preparation of polycondensation resin (L1): nonanediol / dodecanedioic acid polycondensation resin (low Tg resin))
Dodecylbenzenesulfonic acid 0.36 parts 1,9-nonanediol 80 parts 1,10-decamethylenedicarboxylic acid (dodecanedioic acid) 115 parts The above materials are mixed, put into a reactor equipped with a stirrer, and under nitrogen atmosphere When polycondensation was carried out at 120 ° C. for 8 hours, a uniform white polyester resin (L1) was obtained.
The weight average molecular weight by GPC was 15,000, and the glass transition temperature was -58 ° C. The acid value was 10.0 mgKOH / g.

(Preparation of resin particle dispersion (CS1))
100 parts of polycondensation resin (H1) 100 parts of polycondensation resin (L1) The above materials were put into a reactor equipped with a stirrer and dissolved and mixed at 120 ° C. for 30 minutes.
An aqueous solution for neutralization prepared by dissolving 1.0 part of sodium dodecylbenzenesulfonate in 1.0 part of ion-exchanged water heated to 95 ° C. and 1.0 part of 1N NaOH aqueous solution was put into the flask, and a homogenizer (manufactured by IKA, The mixture was emulsified for 5 minutes and then shaken in an ultrasonic bath for 10 minutes, and then the flask was cooled with room temperature water.
As a result, a core-shell resin particle dispersion (CS1) having a median particle size of 250 nm and a solid content of 20% by weight was obtained. The obtained resin dispersion was dried to obtain an acid value of 10 mgKOH / g.

(Preparation of polycondensation resin (H2): Bisphenol A ethylene oxide 6 mol adduct, terephthalic acid, trimellitic acid polycondensation resin (high Tg resin))
Terephthalic acid 83 parts Bisphenol A ethylene oxide 6-mole adduct 246 parts Trimellitic anhydride 1 part Catalyst: Ti (OBu) ₄ 0.02 part The above materials are mixed, put into a reactor equipped with a stirrer, and reduced in pressure. Depressurize the air in the container, make it in an inert atmosphere with nitrogen gas, perform refluxing at 180 ° C for 6 hours with mechanical stirring, then gradually raise the temperature to 220 ° C and stir for 2 hours, vacuum distillation The polymerization was allowed to proceed. The weight average molecular weight by GPC was 16,000, and the glass transition temperature was 62 ° C. The acid value was 13.5 mgKOH / g.

(Preparation of polycondensation resin (L2): bisphenol A ethylene oxide 6 mol adduct, bisphenol S ethylene oxide 2 mol adduct, 1,4-cyclohexanedicarboxylic acid, trimellitic acid polycondensation resin (low Tg resin))
1,4-cyclohexanedicarboxylic acid 87.5 parts Bisphenol A ethylene oxide 6 mole adduct 197 parts Bisphenol S ethylene oxide 2 mole adduct 34 parts Trimellitic anhydride 0.5 part p-Toluenesulfonic acid 0.5 part Were added to a reactor equipped with a stirrer, and polycondensation was carried out at 120 ° C. for 8 hours under a nitrogen atmosphere to obtain a uniform white polyester resin (L2). The weight average molecular weight by GPC was 15,000, and the glass transition temperature was 38 ° C. The acid value was 6.8 mgKOH / g.

(Preparation of polycondensation resin (L2 ′))
In the preparation of the above polycondensation resin (L2), 0.02 part of Sn (OBu) ₄ was used instead of p-toluenesulfonic acid as a catalyst, and polymerization was performed under the conditions of H2. The obtained polycondensation resin L2 ′ had a weight average molecular weight of 13,500 by GPC and a glass transition temperature of 36 ° C. The acid value was 6.0 mgKOH / g.

(Preparation of resin particle dispersion (CS2))
100 parts of polycondensation resin (H2) 100 parts of polycondensation resin (L2) The above materials are put into a reactor equipped with a stirrer, dissolved and mixed at 120 ° C. for 30 minutes, and then 800 parts of ion-exchanged water heated to 95 ° C. Into the flask was added a neutralizing aqueous solution in which 1.0 part of sodium dodecylbenzenesulfonate and 1.0 part of 1N NaOH aqueous solution were dissolved in the flask, followed by emulsification with a homogenizer (Ultra Turrax, manufactured by IKA) for 5 minutes. Further, after shaking for 10 minutes in an ultrasonic bath, the flask was cooled with room temperature water.
As a result, a core-shell resin particle dispersion (CS2) having a median particle diameter of 180 nm and a solid content of 20% by weight was obtained. The obtained resin dispersion was dried and the acid value was determined to be 10.2 mg KOH / g.

The resin particles in the obtained dispersion were salted out with sodium chloride, filtered, washed with ion-exchanged water, and then dried with a freeze dryer.
When the surface composition of the dried product was analyzed by XPS (X-ray photoelectron spectroscopy), only a trace amount of the sulfur component derived from the catalyst was observed, so it was considered that the particles had a core-shell structure with the L2 resin as the core component.

(Preparation of resin particle dispersion (CS2 ′))
In the preparation of CS2, a core-shell resin particle dispersion (CS2 ′) was obtained in the same manner as in the preparation of CS2, except that L2 ′ resin was used instead of L2 resin.
When the cross-sectional composition of the dried product was analyzed by XMA (X-ray microanalysis), titanium was detected from the shell portion, and tin was detected from the core portion. Therefore, the particles had a core-shell structure with L2 ′ resin as the core component. it was thought.
As a result, a core-shell resin particle dispersion (CS2 ′) having a median particle diameter of 200 nm and a solid content of 20% by weight was obtained. The obtained resin dispersion was dried and the acid value was determined to be 9.8 mgKOH / g.

(Preparation of polycondensation resin (H3): bisphenol A ethylene oxide 2 mol adduct, bisphenol S ethylene oxide 2 mol adduct, 1,4-cyclohexanedicarboxylic acid, trimellitic acid polycondensation resin (high Tg resin))
1,4-cyclohexanedicarboxylic acid 175 parts Bisphenol A ethylene oxide 2-mole adduct 290 parts Bisphenol S ethylene oxide 2-mole adduct 34 parts Trimellitic anhydride 2 parts Dodecylbenzenesulfonic acid 0.5 parts The above materials are mixed and stirred The mixture was put into a reactor equipped with a machine and subjected to polycondensation for 12 hours at 120 ° C. under a nitrogen atmosphere. As a result, a uniformly transparent polyester resin (H3) was obtained.
The weight average molecular weight by GPC was 17,000, and the glass transition temperature was 65 ° C.
The acid value was 14.0.

(Preparation of polycondensation resin (L3): hexanediol / sebacic acid polycondensation resin (low Tg resin))
Dodecylbenzenesulfonic acid 0.36 parts 1,6-hexanediol 80 parts Sebacic acid 115 parts The above materials were mixed, put into a reactor equipped with a stirrer, and subjected to polycondensation at 90 ° C for 5 hours in a nitrogen atmosphere. A uniform white polyester resin (L3) was obtained.
The weight average molecular weight by GPC was 8,000, and the glass transition temperature was -52 ° C. The acid value was 10.0.

(Preparation of polycondensation resin (H3 ′))
In the preparation of the polycondensation resin (H3), a resin was prepared in the same manner except that the amount of trimellitic anhydride was 0.2 parts.
The weight average molecular weight by GPC was 16,000, and the glass transition temperature was 65 ° C.
The acid value was 6.0.

(Preparation of resin particle dispersion (CS3))
Polycondensation resin (H3) 100 parts Polycondensation resin (L3) 100 parts The above materials were put into a reactor equipped with a stirrer, dissolved and mixed at 120 ° C. for 30 minutes, and then 800 parts of ion-exchanged water heated to 95 ° C. Into the flask, an aqueous solution for neutralization in which 1.0 part of sodium dodecylbenzenesulfonate and 1.0 part of 1N NaOH aqueous solution were dissolved was added to the flask and emulsified with a homogenizer (IKA Corporation, Ultra Tarrax) for 5 minutes. After shaking for 10 minutes in an ultrasonic bath, the flask was cooled with room temperature water.
As a result, a core-shell resin particle dispersion (CS3) having a median particle size of 220 nm and a solid content of 20% by weight was obtained. The obtained resin dispersion was dried to obtain an acid value of 11 mgKOH / g.
The resin particles in the obtained dispersion were salted out with sodium chloride, filtered, washed with ion-exchanged water, and then dried with a freeze dryer.
When the surface composition of the dried product was analyzed by XPS (X-ray photoelectron spectroscopy), a sulfur component corresponding to H3 resin was observed, and thus it was considered to be a particle having a core-shell structure having L3 resin as a core component.

(Preparation of resin particle dispersion (CS3 ′))
Polycondensation resin (H3 ′) 100 parts Polycondensation resin (L3) 100 parts The above materials were charged into a reactor equipped with a stirrer, dissolved and mixed at 120 ° C. for 30 minutes, and then ion-exchanged water 800 heated to 95 ° C. Into the flask was added a neutralizing aqueous solution in which 1.0 part of sodium dodecylbenzenesulfonate 1.0 part was dissolved in 1 part of the 1N NaOH aqueous solution, and the mixture was emulsified with a homogenizer (manufactured by IKA, Ultra Tarrax) for 5 minutes. Furthermore, after shaking for 10 minutes in an ultrasonic bath, the flask was cooled with room temperature water. As a result, a core-shell resin particle dispersion (CS3 ′) having a median particle diameter of 250 nm and a solid content of 20% by weight was obtained.
The resin particles in the obtained dispersion were salted out with sodium chloride, filtered, washed with ion-exchanged water, and then dried with a freeze dryer.
When the surface composition of the dried product was analyzed by XPS (X-ray photoelectron spectroscopy), a sulfur component equivalent to H3 resin was not observed, and it was quantified as equivalent to L3. It was thought that.

(2) Preparation of colorant particle dispersion (preparation of colorant particle dispersion (P1))
Cyan pigment (Daiichi Seika Kogyo Co., Ltd., copper phthalocyanine CI Pigment Blue 15: 3) 50 parts Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen R) 5 parts Ion-exchanged water 200 Part The above components were mixed and dissolved, and dispersed for 5 minutes with a homogenizer (manufactured by IKA, Ultra Tarrax) and for 10 minutes with an ultrasonic bath. A cyan colorant particle dispersion (P1) having a median diameter of 190 nm and a solid content of 21.5% by weight )

(Preparation of colorant particle dispersion (P2))
In the preparation of the colorant particle dispersion (1), a magenta pigment (manufactured by Dainippon Ink & Chemicals, Inc., CI Pigment Red 122) was used instead of the cyan pigment. A magenta colorant particle dispersion (P2) having a median diameter of 165 nm and a solid content of 21.5% by weight was prepared in the same manner as in 1).

(3) Preparation of release agent particle dispersion (preparation of release agent particle dispersion (W1))
30 parts of dodecyl sulfate and 852 parts of ion-exchanged water were mixed to prepare an aqueous dodecyl sulfate solution.
188 parts of palmitic acid and 25 parts of pentaerythritol were mixed, heated to 250 ° C. and melted, then poured into the above-mentioned aqueous dodecyl sulfate solution, emulsified with a homogenizer (IKA Corp., Ultra Tarrax) for 5 minutes, and further subjected to ultrasonic waves. After emulsification in a bath for 15 minutes, the emulsion was maintained at 70 ° C. in a flask while stirring and held for 15 hours.
As a result, a release agent particle dispersion (W1) having a median particle diameter of 200 nm, a melting point of 72 ° C., and a solid content of 20% by weight was obtained.

(Preparation of release agent particle dispersion (W2))
Anionic surfactant (Daiichi Kogyo Seiyaku Co., Ltd., Neogen R) 2 parts Ion-exchanged water 800 parts Carnauba wax 200 parts are mixed, heated to 100 ° C and melted, and then homogenizer (manufactured by IKA, Ultrata). The mixture was emulsified at 100 ° C. using a gorin homogenizer.
As a result, a release agent particle dispersion (W2) having a median particle diameter of 170 nm, a melting point of 83 ° C., and a solid content of 20% by weight was obtained.

(4) Preparation of resin particle dispersion for outer shell (Preparation of resin particle dispersion for outer shell (S1))
Bisphenol A propylene oxide 2.2 mol adduct 77.4 parts Bisphenol A ethylenelen oxide 2.2 mol adduct 33.2 parts Terephthalic acid 60.2 parts Trimellitic anhydride 17.2 parts Dodecenyl succinic anhydride 12.2 Part 0.4 parts of dibutyltin n-oxide was used as a material.

  Put these materials in a stainless steel flask, attach a thermometer, a stainless steel stirring blade, a falling condenser and a nitrogen introduction tube, raise the temperature to 230 ° C. with a mantle heater, and stir in a nitrogen stream under reduced pressure. Reacted for hours. As a result, an amorphous polyester resin A having a glass transition temperature of 50 ° C. and a weight average molecular weight of 15,000 was obtained.

  After 200 parts of this non-crystalline polyester resin A was dissolved in 200 parts of ethyl acetate, the mixture was charged and emulsified while stirring with ultra turrax in 800 parts of ion-exchanged water containing 0.5% by weight of sodium dodecyl sulfate. The solvent was removed by heating to 60 ° C.

  Thus, an outer shell resin particle dispersion (S1) having a median diameter of 140 nm, a glass transition temperature of 50 ° C., and a solid content of 20% by weight was obtained. The acid value was 12 mgKOH / g.

(5) Preparation of toner for developing electrostatic image (Example 2-1)
(Preparation of toner particles (2-1))
-Resin particle dispersion (CS1) 168 parts (42 parts of resin)
Colorant particle dispersion (P1) 40 parts (8.6 parts of colorant)
-40 parts of release agent particle dispersion (W1) (8.6 parts of release agent)
・ Polyaluminum chloride 0.15 parts ・ Ion-exchanged water 300 parts According to the above formulation, the above ingredients were thoroughly mixed and dispersed in a round stainless steel flask with a homogenizer (IKA, Ultra Turrax T50), and then heated. The flask was heated to 42 ° C. with stirring in an oil bath and held at 42 ° C. for 60 minutes, and then 105 parts (21 parts of resin) of the outer shell resin particle dispersion (S1) was added and gently stirred.
Thereafter, the pH in the system was adjusted to 6.0 with a 0.5 mol / liter aqueous sodium hydroxide solution, and then heated to 95 ° C. while stirring was continued. While the temperature was raised to 95 ° C., an aqueous sodium hydroxide solution was added dropwise so that the pH did not become 5.0 or less. Hold at 95 ° C. for 3 hours.
After completion of the reaction, the mixture was cooled, filtered, sufficiently washed with ion exchange water, and then solid-liquid separated by Nutsche suction filtration. Then, it was redispersed in 3 liters of ion exchange water at 40 ° C., and stirred and washed at 300 rpm for 15 minutes. This washing operation was repeated 5 times, followed by solid-liquid separation by Nutsche suction filtration, and then vacuum drying for 12 hours to obtain toner particles (2-1).
When the particle size of the toner particles (2-1) was measured with a Coulter counter, the cumulative volume average particle size D ₅₀ was 4.9 μm, and the volume average particle size distribution index GSDv was 1.22. The shape factor SF1 of the toner particles obtained by shape observation with Luzex was 129 potato shapes.

To 50 parts of the toner particles (2-1), 1.5 parts of hydrophobic silica (manufactured by Cabot, TS720) was added and mixed with a sample mill to obtain an externally added toner (2-1).
Then, using the ferrite carrier having an average particle diameter of 50 μm coated with 1% by weight of polymethyl methacrylate (manufactured by Soken Chemical Co., Ltd.), the external additive (2-1) is added so that the toner concentration becomes 5% by weight. The two were weighed and stirred and mixed for 5 minutes by a ball mill to prepare an electrostatic charge image developer (2-1).

2. Evaluation of toner for developing electrostatic image In the modified machine of DocuCenter Color f450 manufactured by Fuji Xerox Co., Ltd., using the toner particles (2-1) and the electrostatic image developer (2-1), the maximum fixing pressure is The two-roll type copier was remodeled to 1.2 MPa (12 kgf / cm ² ) (further, the heating roll was changed to a high-hardness roll in which a SUS tube was coated with Teflon (registered trademark) to obtain 9.8 MPa. As a transfer paper, mirror coated platinum paper (256 g / m ² ), a thick paper coated by Fuji Xerox Co., Ltd., is used, and the process speed is adjusted to 180 mm / sec to fix the toner. The oil-less fixability is good, and the minimum fixing temperature (this temperature is determined by image contamination by cloth rubbing of the image) is 90 ° C. or higher. , Images with exhibit sufficient fixability was good uniformity of gloss. Both developability and transferability were good, and there was no image defect and a high quality and good image (◯) was shown. Even at a fixing temperature of 180 ° C., no occurrence of hot offset was observed. In addition, the above-described modified machine was subjected to 100,000 continuous print tests at 23 ° C. and 55% RH, but the initial good image quality was maintained until the end (continuous test maintainability: ◯).

Evaluation of the electrostatic image developing toner (electrostatic image developer) was performed according to the following criteria.
a. Oil-less fixing property Even if oil is not applied to the heated roll, it does not wrap around the roll.

b. Minimum Fixing Temperature The minimum fixing temperature was set to the minimum temperature of the heating roller where the fixed image was rubbed with a gauze cloth and no defect in the fixed image occurred.

c. Gloss uniformity In a solid (surface) image in one sheet, no difference in gloss is visually observed in the sheet.

d. Image quality Image quality was determined as follows by measuring the fine line reproducibility of the image with the fine line fixed and the fog of the non-fixed part with a loupe.
○ ・ ・ ・ There is no unevenness in the fine lines, and there is no fogging. △ ・ ・ ・ There is slight unevenness in image quality. × ・ ・ ・ There is unevenness in image quality.

e. Hot offset generation temperature The offset generation temperature is measured by performing the fixing process with the above-mentioned copying machine, and then sending a white transfer paper to the fixing machine under the same conditions to visually check whether toner contamination occurs. The observation operation was repeated while changing the set temperature of the fixing machine, and the lowest set temperature at which contamination with toner occurred was determined as the offset generation temperature.

f. Continuous test maintainability A continuous print test of 50,000 sheets was performed under conditions of 23 ° C. and 55% RH, and the following determination was made.
○ ・ ・ ・ Good initial image quality was maintained until the end △ ・ ・ ・ Slight image quality degradation was observed × ・ ・ ・ Clear image quality degradation occurred

(Example 2-2)
Toner Example 2 except that the resin particle dispersion (CS2), the release agent particle dispersion (W1), and the colorant particle dispersion (P2) were used and the pH was raised to 7.0 when the temperature was raised to 95 ° C. In the same manner as in Example 1, a toner for developing an electrostatic image and an electrostatic image developer were prepared and evaluated. As for cardboard fixability, sufficient fixability was exhibited at 110 ° C. or higher. Even in the continuous test maintainability, the initial good image quality was maintained until the end (continuous test maintainability: ◯). The results are shown in Table 2.

(Example 2-3)
Using the resin particle dispersion (CS3), the release agent particle dispersion (W2), and the colorant particle dispersion (P2), a toner for developing an electrostatic image and developing an electrostatic image in the same manner as in Toner Example 2-1. An agent (2-3) was produced (in the cardboard fixability, sufficient fixability was exhibited at 95 ° C. or higher).

(Evaluation of toner)
Using the above electrostatic image developer (2-3), in a modified machine of DocuCenter Color f450 manufactured by Fuji Xerox Co., Ltd., a heating roll so that the maximum fixing pressure is 9.5 MPa (12 kgf / cm ² ). Was changed to a high-hardness roll in which SUS pipe was coated with Teflon (registered trademark), and a two-roll type fixing machine was modified.
Mirror-coated platinum paper (256 g / m ² ), a thick-coated paper specified by Fuji Xerox Co., Ltd., was used as the transfer paper, and the process speed was adjusted to 180 mm / sec. Fixability is good, and the minimum fixing temperature (this temperature is determined by image contamination by cloth rubbing of the image) is 95 ° C. or higher, and the image shows sufficient fixability and gloss uniformity is also good. Met. Both developability and transferability were good, and there was no image defect and a high quality and good image (◯) was shown. No hot offset was observed up to a fixing temperature of 150 ° C. In addition, although the above-mentioned modified machine performed a continuous print test of 100,000 sheets at 23 ° C. and 55% RH, the good image quality was maintained without any significant change from the initial good image quality (continuous test maintainability: ◯).

(Example 2-4)
Using the resin particle dispersion (CS3 ′), the release agent particle dispersion (W2), and the colorant particle dispersion (P2), a toner for developing an electrostatic image and developing an electrostatic image in the same manner as in Example 2-1. An agent was prepared (the fixing property of cardboard was sufficient at 90 ° C. or higher).
A continuous print test of 100,000 sheets was conducted at 23 ° C. and 55% RH, but there was no significant change from the initial good image quality, but slight streaking due to photoconductor contamination was observed (continuous test maintainability: Δ). .

(Example 2-5)
An electrostatic image developing toner and an electrostatic image developer were prepared in the same manner as in Example 2-2, except that CS2 ′ resin was used in Example 2-2.
As for cardboard fixability, sufficient fixability was exhibited at 110 ° C. or higher.
Even in the continuous test maintenance, the initial good image quality was maintained until the end (continuous test maintenance ○).

(Comparative Example 2-1)
Example 2-1 was held at 42 ° C. for 60 minutes, and then the same as in Example 2-1, except that the outer shell resin particle dispersion (S1) was changed to 84 parts of the resin particle dispersion (CS1). Then, an electrostatic charge image developing toner and an electrostatic charge image developer were prepared.
When the particle size of the toner particles was measured with a Coulter counter, the cumulative volume average particle size D ₅₀ was 5.2 μm, and the volume average particle size distribution index GSDv was 1.24. Further, the shape factor SF1 of the toner particles obtained from the shape observation by Luzex was 125 potato shape. The external additive was formulated in the same manner as in Example 2-1, and the same evaluation was performed. In the continuous printing test of 100,000 sheets, fogging occurred on the image from about 60,000 sheets. When the photoreceptor was taken out and observed, toner filming occurred. Other evaluation items were good and there was no problem at all.

Claims (4)

Having a core and an outer shell,
The core comprises a block copolymer comprising a crystalline polyester block and an amorphous polyester block;
50 to 100% by weight of the total weight of the outer shell is an amorphous polyester resin,
The glass transition temperature of the amorphous polyester resin contained in the outer shell is a value between the glass transition temperature of the crystalline polyester block and the glass transition temperature of the amorphous polyester block. An electrostatic charge image developing toner for heat and pressure fixing. The electrostatic image developing toner according to claim 1, wherein the acid value of the entire resin contained in the outer shell is higher than the acid value of the entire resin contained in the core. Electrostatic image developer comprising a toner and a carrier for electrostatic image development according to claim 1 or 2. An electrostatic latent image forming step for forming an electrostatic latent image on the surface of the latent image holding member;
A developing step of forming a toner image by developing the electrostatic latent image formed on the surface of the latent image holding member with an electrostatic charge image developing toner or an electrostatic charge image developer containing the toner and a carrier;
A transfer step of transferring the toner image formed on the surface of the latent image holding member to the surface of the transfer target; and
Including a heat and pressure fixing step of fixing the toner image transferred to the surface of the transfer target by heating and pressing.
The electrostatic charge image developing toner is the electrostatic charge image developing toner according to claim 1 or 2 , or
The electrostatic image developer is the electrostatic image developer according to claim 3 ,
The image forming method, wherein a fixing pressure in the fixing step is 1 to 50 MPa.