JP4787700B2 - Toner for developing electrostatic image and method for producing the same - Google Patents

Description

  The present invention relates to a toner used as a developer for developing an electrostatic image in electrophotography, electrostatic recording, electrostatic printing and the like. More specifically, the present invention relates to a toner for electrophotography that is used in a copying machine, a laser printer, a plain paper fax machine, and the like using a direct or indirect electrophotographic developing system.

  In recent years, the strong demand for higher image quality and higher speed from the market has spurred the development of an electrophotographic apparatus suitable for it and a toner developer used therefor. It is essential that the toner corresponding to the high speed is a toner having a charge performance that quickly achieves the electrostatic charge to a desired charge level after replenishment.

  In addition to the polarity and magnitude of the electrostatic charge, an important decisive quality criterion is that this charge does not change over a long excitation period other than quickly reaching the desired charge level. Another important criterion for suitability is that the toner is insensitive to environmental effects such as temperature and atmospheric humidity.

  As a toner corresponding to high image quality, it is essential that the toner has a small particle diameter and a uniform particle diameter. When the toner particle size is uniform and the particle size distribution becomes sharp, the behavior of individual toner particles during development is aligned, and the reproducibility of minute dots is remarkably improved.

  However, a conventional pulverized toner requires a huge amount of energy and a classification process to produce a toner having a small particle size and a uniform particle size, resulting in difficulty in productivity. In some cases, a charge control agent is used for charge control. In such a case, a step of kneading into the toner together with the binder resin or driving into the toner surface is required. There was a problem in terms of cost, such as the need to add more than the necessary amount. Under such circumstances, various methods have been proposed for improving these problems by using a polymerized toner method different from the conventional pulverization method.

  In addition to suspension polymerization, there are emulsion polymerization methods and dissolution suspension methods in addition to suspension polymerization methods. However, it is difficult to completely remove styrene monomers and emulsifiers and dispersants in emulsion polymerization methods. The problem with toners is becoming increasingly important as they become more close-up. In addition, in charge performance of toner, due to weak adhesion of the charge control agent and silica movement to the recess during use, problems of toner contamination with the toner and toner adhesion to the fixing roller occur. It becomes easy. In addition, the dissolution suspension method has the advantage of using a polyester resin that can be fixed at low temperature, but in order to achieve oil-less fixing, the polymer and color are controlled during production and control of the polymer to widen the mold release width. Since the high molecular weight component is added in the step of dissolving or dispersing the agent in the solvent, the viscosity of the liquid rises and productivity problems are likely to occur. And those problems are not solved yet. Particularly in the dissolution suspension method, the toner surface shape is made spherical and uneven to improve the cleaning (see, for example, Patent Document 1). However, since it is an irregularly shaped irregular toner, charging stability is improved. In addition, a high-quality toner for ensuring basic durability and releasability has not been achieved, and satisfactory toner quality has not been obtained.

Further, by adding a specific compound powder and a specific inorganic fine powder having a predetermined specific surface area to the toner particles, it is possible to obtain a pulverized toner exhibiting preferable charging characteristics and particularly excellent in environmental dependency of image density. Although it has been proposed (see, for example, Patent Document 2), it is actually insufficient to achieve both high image quality and charging characteristics.
JP 9-15903 A Japanese Patent No. 2682331

  Accordingly, the present invention has been made in view of the above, and an object of the present invention is to provide a toner that can obtain high reliability in charging performance, excellent low-temperature fixability, and high-definition and high-quality images. To do.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have completed the present invention.

  That is, according to the present invention, the following toner is provided.

(1) at least, in an organic solvent, a polymer having a site reactive with a compound having the compound and the active hydrogen group having an active hydrogen group, a binder resin, a colorant, a releasing agent, intercalating the fatty acid The kneaded composite of the layered inorganic mineral and the binder resin is dissolved or dispersed, and the solution or dispersion is dispersed in an aqueous medium containing resin fine particles , and the compound having active hydrogen groups and the active hydrogen groups are dispersed. A toner for an electrostatic charge image phenomenon, wherein the organic solvent is removed, washed and dried after reacting a polymer having a site capable of reacting with a compound having or
In said toner, the dispersion diameter of the layered inorganic mineral intercalated with fatty acids, meets the 0.01μm~1μm volume average particle diameter Dv, and,
The toner for an electrostatic charge image phenomenon , wherein a frequency of 1 μm or more in volume average particle diameter Dv in the dispersion diameter is 2.5% or less .

  (2) The electrostatic image developing toner according to (1), wherein a layered inorganic mineral intercalated with a fatty acid is dissolved or dispersed in an organic solvent as a kneaded composite with the binder resin.

  (3) The layered inorganic mineral intercalated with fatty acid was placed in a medium with a 1: 1 weight ratio of ethyl acetate and water, shaken, and left standing for 1 hour. Is present at the interface between ethyl acetate and water, (1) or (2).

  (4) The electrostatic charge image development according to any one of (1) to (3), wherein a layered inorganic mineral intercalated with a fatty acid is contained in the toner in an amount of 0.1 to 5%. Toner.

  (5) The toner for developing an electrostatic charge image according to any one of (1) to (4), wherein the fatty acid is stearic acid.

  (6) Charge amount measured by blow-off method in an environment of temperature 28 ° C. and humidity 80% is 15 seconds stirring charge amount of −30 ± 5 μQ / g, 5 minutes stirring charge amount and 10 minutes stirring charge amount are The electrostatic charge image developing toner according to any one of (1) to (5), wherein a change in charge amount is 5 μc / g or less with respect to a charge amount stirred for 15 seconds.

  (7) The electrostatic image developing toner according to any one of (1) to (6), wherein the toner has a volume average particle diameter of 3 to 7 μm.

(8) The electrostatic charge image developing according to any one of (1) to (7), wherein the toner has a volume particle diameter Dv / number average particle diameter Dn of 1.00 to 1.30. toner.

  (9) The electrostatic image developing toner according to any one of (1) to (8), wherein the toner has a volume average particle diameter Dv of 2 μm or less in an amount of 1 to 10% by number.

  (10) The electrostatic image developing toner according to any one of (1) to (9), wherein the binder resin is a polyester resin.

  (11) The toner for developing an electrostatic charge image according to any one of (1) to (10), wherein the polyester resin has a THF-soluble component having a weight average molecular weight of 1,000 to 30,000. .

  (12) The polyester resin is an acidic group-containing polyester, and the acid value of the acidic group-containing polyester resin is 1.0 to 50.0 (KOHmg / g). The electrostatic image developing toner according to any one of the above.

  (13) The toner for developing an electrostatic charge image according to any one of (1) to (12), wherein the acidic group-containing polyester resin has a glass transition point of 35 to 65 ° C.

  (14) The electrostatic charge image according to any one of (1) to (13), wherein the polymer having a site capable of reacting with a compound having an active hydrogen group has a weight average molecular weight of 3,000 to 20,000. Development toner.

  (15) The toner for developing an electrostatic charge image according to any one of (1) to (14), wherein the toner has an acid value of 0.5 to 40.0 (KOHmg / g).

  (16) The toner for developing an electrostatic charge image according to any one of (1) to (15), wherein the toner has a glass transition point of 40 to 70 ° C.

  (17) The electrostatic image developing toner according to any one of (1) to (16), which is a toner used for a two-component developer.

(18) at least, in an organic solvent, a polymer having a site reactive with a compound having the compound and the active hydrogen group having an active hydrogen group, a binder resin, a colorant, a releasing agent, a fatty acid intercalation The kneaded composite of the layered inorganic mineral and the binder resin is dissolved or dispersed, the solution or dispersion is dispersed in an aqueous medium containing resin fine particles , and the compound having the active hydrogen group and the active hydrogen group are contained. A method for producing a toner for an electrostatic charge image phenomenon in which the organic solvent is removed, washed and dried after reacting a polymer having a site capable of reacting with a compound,
The dispersion diameter of the layered inorganic mineral intercalated with the fatty acid satisfies a volume average particle diameter Dv of 0.01 μm to 1 μm, and the frequency of the volume average particle diameter Dv of 1 μm or more satisfies 2.5 % or less. A method for producing a toner for developing an electrostatic charge image, comprising a kneading composite step with the binder resin in a dispersed state.

  According to the present invention, it is possible to provide a toner that has charging characteristics that do not depend on the environment, is excellent in low-temperature fixability, and provides an image with high image quality and high resolution.

  Next, the best mode for carrying out the present invention will be described.

  The toner of the present invention comprises a layered inorganic mineral obtained by intercalating at least a polymer having a site capable of reacting with a compound having an active hydrogen group, a binder resin, a colorant, a release agent, and a fatty acid in an organic solvent. The organic solvent is removed after the dissolved or dispersed solution or dispersion is dispersed in an aqueous medium and the polymer having a site capable of reacting with the compound having an active hydrogen group is reacted or while reacting. The dispersion diameter of the layered inorganic mineral intercalated with the fatty acid in the toner is 0.01 μm to 1 μm in terms of volume average particle diameter Dv. . This makes it possible to obtain a high-resolution and high-quality toner. When the dispersion diameter of the layered inorganic mineral intercalated with fatty acid in the toner is smaller than 0.01 μm in volume average particle diameter Dv, the fixing performance is deteriorated. To do. On the other hand, when the dispersion diameter of the layered inorganic mineral intercalated with fatty acid in the toner is larger than 1 μm in volume average particle diameter Dv, the effect on the toner charging performance is lowered.

  The toner of the present invention will be described in detail.

  First, the layered inorganic mineral intercalated with the fatty acid used in the toner of the present invention will be described.

As the layered inorganic mineral used in the toner of the present invention, a material in which a fatty acid is inserted (intercalated) between layers is used. The layered inorganic mineral intercalated with a fatty acid is preferably an intercalated fatty acid with a hydrotalcite-based basic crystal structure.

  Examples of the fatty acid of the layered inorganic mineral intercalated with fatty acid include myristic acid, palmitic acid, stearic acid, arachidic acid and the like. Of these, palmitic acid and stearic acid are preferably used, and stearic acid is more preferably used. The intercalated fatty acid is preferably 5 to 15% by weight based on the whole layered inorganic mineral intercalated with the fatty acid. If it is 5% by weight or less, there are few fatty acids present as anions between the layers, and a preferable negative chargeability cannot be obtained. On the other hand, when the content is 15% by weight or more, the structure of the layered inorganic mineral becomes unstable.

  In addition, a kneaded composite of a layered inorganic mineral intercalated with a fatty acid and a binder resin, that is, a master batch, is mixed with a binder resin and a layered inorganic mineral intercalated with the fatty acid with high shearing force, It can be kneaded to obtain a master batch. In order to enhance the interaction between the layered inorganic mineral intercalated with the fatty acid and the binder resin, an organic solvent can be used. Also, a so-called flushing method, a layered inorganic mineral intercalated with fatty acid and an aqueous paste containing water are mixed and kneaded together with a resin and an organic solvent, and the layered inorganic mineral intercalated with the fatty acid is transferred to the resin side, Since the wet cake can be used as it is, a method for removing moisture and organic solvent components is preferably used because it does not need to be dried. For mixing and kneading, a high shear dispersion device such as a three-roll mill is preferably used.

In the kneading composite process, the dispersion diameter of the layered inorganic mineral intercalated with the fatty acid and the binder resin, that is, the layered inorganic mineral modified with the fatty acid in the masterbatch is 0. It is necessary that the frequency of the layered inorganic mineral intercalated with the fatty acid having a volume average particle diameter of 1 μm or more of 01 μm to 1 μm satisfies 15% or less. When the volume average particle diameter Dv exceeds 1 μm or the frequency of the volume average particle diameter of 1 μm or more exceeds 15%, the effect on the toner charging performance is lowered.

  As can be recognized from the results of the following examples, the dispersion diameter of the layered inorganic mineral intercalated with fatty acid is the process from dissolving the masterbatch prepared above in the dispersion and finally producing the toner. The (volume average particle diameter Dv) hardly changes, and the dispersion diameter of the layered inorganic mineral intercalated with the fatty acid in the toner is the volume average particle diameter Dv, which can be similarly 0.01 μm to 1 μm. That is, when the dispersion diameter of the layered inorganic mineral intercalated with fatty acid in the master batch is 0.01 μm to 1 μm in terms of volume average particle diameter Dv, finally, the layered form in which the fatty acid is intercalated in the toner. The dispersion diameter of the inorganic mineral is necessarily 0.01 μm to 1 μm in volume average particle diameter Dv.

  Therefore, as described above, the dispersion diameter of the layered inorganic mineral intercalated with the fatty acid in the toner becomes 0.01 μm to 1 μm in terms of the volume average particle diameter Dv, thereby obtaining a high-resolution and high-quality toner. Is possible.

  The layered inorganic mineral intercalated with fatty acid is preferably contained in the toner in an amount of 0.1 to 5%. When the content of the layered inorganic mineral intercalated with the fatty acid in the toner is less than 0.1%, the effect on the toner charging performance is lowered, and when it exceeds 5%, the fixing performance is deteriorated.

  Furthermore, it is preferable that the layered inorganic mineral intercalated with fatty acid is subjected to a hydrophobic treatment. The layered inorganic mineral obtained by intercalating the hydrophobically treated fatty acid preferably exhibits the following characteristics. That is, when the layered inorganic mineral intercalated with the fatty acid is placed in a medium having a 1: 1 weight ratio of ethyl acetate and water and shaken, and left to stand for 1 hour, the layered inorganic mineral intercalated with the fatty acid Is preferably present at the interface between ethyl acetate and water. As a result, in the conventional dissolution suspension method, the internally added charge control agent was taken into the interior and the function as a sufficient charge control agent was not expressed, whereas the toner of the present invention has the above-described properties. By using the charge control agent, the charge control agent is selectively present on the toner surface from the tendency of oil-water distribution, and the function as the charge control agent is easily exhibited. In addition, when the volume average particle diameter Dv satisfies 0.01 μm to 1 μm, the charge control agent is likely to be present in the toner, and internal addition of the charge control agent that has not been possible so far can be performed. Is.

  Known surface treatment agents can be used, and examples thereof include silane coupling agents, titanate coupling agents, higher fatty acids, anionic surfactants, silicone oils, etc. A ring agent and silicone oil are preferable from the viewpoint of hydrophobicity and chargeability, and a silane coupling agent is more preferable from the viewpoint of environment dependency and fluidity. The use of a silane coupling agent as the surface treatment agent for the inorganic fine powder has a high degree of imparting a hydrophobic function and is excellent in the fluidity improving function of the inorganic powder.

  Conventionally known methods are used for the surface treatment of inorganic fine powder with a silane coupling agent. For example, organoalkoxylane (methoxytrimethylsilane, dimethoxydimethylsilane, trimethoxymethylsilane, ethoxytrimethylsilane, etc.) is used as the silane coupling agent. , Organochlorosilane (trichloromethylsilane, dichlorodimethylsilane, chlorotrimethylsilane, trichloroethylsilane, dichlorodiethylsilane, trichlorophenylsilane, etc.), organosilazane (triethylsilazane, tripropylsilazane, triphenylsilazane, hexamethyldisilane) Silazane, hexaethyldisilazane, hexaphenyldisilazane, etc.), organodisilane, organosilane and the like, and these are used in one kind or a mixture of two or more kinds. The silane coupling agent is preferably organochlorosilane or organosilazane.

  Conventionally known methods are used for the surface treatment of inorganic fine powder with silicon oil. For example, as silicon oil, dimethyl silicone oil, methyl phenyl silicone oil, methyl hydrogen silicone oil, and modified silicone, which are general straight silicone oils, are used. There are methacryl-modified silicone oil, alkyl-modified silicone oil, epoxy-modified silicone oil, amino-modified silicone oil, etc., which are oils, and they are used in one kind or a mixture of two or more kinds. The silicone oil is preferably straight silicone oil.

  Examples of the reactive modified polyester resin (RMPE) capable of reacting with active hydrogen used in the present invention include a polyester prepolymer (A) having an isocyanate group. Examples of the prepolymer (A) include a polycondensate of a polyol (PO) and a polycarboxylic acid (PC) and a polyester having active hydrogen further reacted with a polyisocyanate (PIC). Examples of the group containing active hydrogen in the polyester include a hydroxyl group (alcoholic hydrogen group and phenolic hydroxyl group), an amino group, a carboxyl group, a mercapto group, and the like. Among these, an alcoholic hydroxyl group is preferable.

  The amines described in detail later act as a crosslinking agent and an extender for the modified polyester capable of reacting with active hydrogen.

  Modified polyesters such as urea-modified polyester obtained by reacting the above-mentioned polyester prepolymer (A) having an isocyanate group with amines (B) are easy to adjust the molecular weight of the polymer component, and are dry toner, especially oilless low-temperature fixing. It is convenient to ensure the characteristics (wide releasability and fixability without a release oil application mechanism to the fixing heating medium). Particularly, a polyester prepolymer whose end is modified with urea can suppress adhesion to a heating medium for fixing while maintaining high fluidity and transparency in the fixing temperature range of the unmodified polyester resin itself.

  A preferred polyester prepolymer used in the present invention is a polyester having an active hydrogen group such as an acid group or a hydroxyl group at the terminal, and a functional group such as an isocyanate group that reacts with the active hydrogen. A modified polyester (MPE) such as urea-modified polyester can be derived from this prepolymer, but in the case of the present invention, a preferred modified polyester used as a toner binder is a polyester prepolymer (A) having an isocyanate group. It is a urea-modified polyester obtained by reacting amines (B) as a crosslinking agent and / or an extender. The polyester prepolymer (A) having an isocyanate group is obtained by further reacting a polyester having an active hydrogen group, which is a polycondensate of a polyol (PO) and a polycarboxylic acid (PC), with a polyisocyanate (PIC). Can do. Examples of the active hydrogen group possessed by the polyester include hydroxyl groups (alcoholic hydroxyl groups and phenolic hydroxyl groups), amino groups, carboxyl groups, mercapto groups, and the like. Among these, alcoholic hydroxyl groups are preferred.

  Examples of the polyol (PO) include a diol (DIO) and a trivalent or higher polyol (TO), and (DIO) alone or a mixture of (DIO) and a small amount of (TO) is preferable. Diol (DIO) includes alkylene glycol (ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,6-hexanediol, etc.); alkylene ether glycol (diethylene glycol, triethylene glycol, Ethylene glycol, dipropylene glycol, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, etc.); alicyclic diols (1,4-cyclohexanedimethanol, hydrogenated bisphenol A, etc.); bisphenols (bisphenol A, bisphenol F, Bisphenol S, etc.); alkylene oxide (ethylene oxide, propylene oxide, butylene oxide, etc.) adduct of the above alicyclic diol; Alkylene oxide phenol compound (ethylene oxide, propylene oxide, butylene oxide, etc.), etc. adducts. Among them, preferred are alkylene glycols having 2 to 12 carbon atoms and alkylene oxide adducts of bisphenols, and particularly preferred are alkylene oxide adducts of bisphenols and alkylene glycols having 2 to 12 carbon atoms. It is a combined use. Examples of the trivalent or higher polyol (TO) include 3 to 8 or higher polyhydric aliphatic alcohols (glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitol, etc.); trivalent or higher phenols (Tris) Phenol PA, phenol novolak, cresol novolak, etc.); alkylene oxide adducts of the above trivalent or more polyphenols.

  Examples of the polycarboxylic acid (PC) include dicarboxylic acid (DIC) and trivalent or higher polycarboxylic acid (TC), and DIC alone or a mixture of DIC and a small amount of (TC) is preferable. Dicarboxylic acids (DIC) include alkylene dicarboxylic acids (succinic acid, adipic acid, sebacic acid, etc.); alkenylene dicarboxylic acids (maleic acid, fumaric acid, etc.); aromatic dicarboxylic acids (phthalic acid, isophthalic acid, terephthalic acid, naphthalene) Dicarboxylic acid and the like). Of these, preferred are alkenylene dicarboxylic acids having 4 to 20 carbon atoms and aromatic dicarboxylic acids having 8 to 20 carbon atoms. Examples of the trivalent or higher polycarboxylic acid (TC) include aromatic polycarboxylic acids having 9 to 20 carbon atoms (such as trimellitic acid and pyromellitic acid). In addition, as polycarboxylic acid (PC), you may make it react with a polyol (PO) using the above-mentioned acid anhydride or lower alkyl ester (Methyl ester, ethyl ester, isopropyl ester, etc.). The ratio of the polyol (PO) and the polycarboxylic acid (PC) is usually 2/1 to 1/1, preferably 1 as the equivalent ratio [OH] / [COOH] of the hydroxyl group [OH] and the carboxyl group [COOH]. 5/1 to 1/1, more preferably 1.3 / 1 to 1.02 / 1.

  As polyisocyanate (PIC), aliphatic polyisocyanate (tetramethylene diisocyanate, hexamethylene diisocyanate, 2,6-diisocyanatomethylcaproate, etc.); alicyclic polyisocyanate (isophorone diisocyanate, cyclohexylmethane diisocyanate, etc.); aromatic Diisocyanates (tolylene diisocyanate, diphenylmethane diisocyanate, etc.); araliphatic diisocyanates (α, α, α ′, α′-tetramethylxylylene diisocyanate, etc.); isocyanurates; polyisocyanates such as phenol derivatives, oximes, caprolactams, etc. And a combination of two or more of these.

  The ratio of the polyisocyanate (PIC) is usually 5/1 to 1/1, preferably 4 /, as an equivalent ratio [NCO] / [OH] of the isocyanate group [NCO] and the hydroxyl group [OH] of the polyester having a hydroxyl group. 1 to 1.2 / 1, more preferably 2.5 / 1 to 1.5 / 1. When [NCO] / [OH] exceeds 5, low-temperature fixability deteriorates. When the molar ratio of [NCO] is less than 1, when a modified polyester is used, the urea content in the ester becomes low and the hot offset resistance deteriorates. The content of the polyisocyanate (3) component in the prepolymer (A) having an isocyanate group at the terminal is usually 0.5 to 40% by weight, preferably 1 to 30% by weight, more preferably 2 to 20% by weight. It is. If it is less than 0.5% by weight, the hot offset resistance deteriorates, and it is disadvantageous in terms of both heat-resistant storage stability and low-temperature fixability. On the other hand, if it exceeds 40% by weight, the low-temperature fixability deteriorates.

  The number of isocyanate groups contained per molecule in the prepolymer (A) having an isocyanate group is usually 1 or more, preferably 1.5 to 3 on average, more preferably 1.8 to 2.5 on average. It is. If it is less than 1 per molecule, the molecular weight of the urea-modified polyester will be low, and the hot offset resistance will deteriorate.

  As amines (B), diamine (B1), trivalent or higher polyamine (B2), aminoalcohol (B3), aminomercaptan (B4), amino acid (B5), and amino acids B1-B5 blocked (B6) etc. are mentioned. Examples of the diamine (B1) include aromatic diamines (phenylenediamine, diethyltoluenediamine, 4,4′diaminodiphenylmethane, etc.); alicyclic diamines (4,4′-diamino-3,3′dimethyldicyclohexylmethane, diaminecyclohexane, Isophorone diamine etc.); and aliphatic diamines (ethylene diamine, tetramethylene diamine, hexamethylene diamine etc.) and the like. Examples of the trivalent or higher polyamine (B2) include diethylenetriamine and triethylenetetramine. Examples of amino alcohol (B3) include ethanolamine and hydroxyethylaniline. Examples of amino mercaptan (B4) include aminoethyl mercaptan and aminopropyl mercaptan. Examples of the amino acid (B5) include aminopropionic acid and aminocaproic acid. Examples of B1 to B5 blocked amino groups (B6) include ketimine compounds and oxazolidine compounds obtained from the amines of B1 to B5 and ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.). Among these amines (B), preferred are B1 and a mixture of B1 and a small amount of B2.

  Furthermore, if necessary, the molecular weight of the polyester can be adjusted using an elongation terminator. Examples of the elongation terminator include monoamines (diethylamine, dibutylamine, butylamine, laurylamine, etc.), and those obtained by blocking them (ketimine compounds).

  The ratio of amines (B) is the equivalent ratio [NCO] / [NHx] of isocyanate groups [NCO] in the prepolymer (A) having isocyanate groups and amino groups [NHx] in amines (B). The ratio is usually 1/2 to 2/1, preferably 1.5 / 1 to 1 / 1.5, more preferably 1.2 / 1 to 1 / 1.2. When [NCO] / [NHx] is more than 2 or less than 1/2, the molecular weight of the polyester is lowered and the hot offset resistance is deteriorated.

  In the present invention, the polyester resin (polyester) preferably used as a toner binder is urea-modified polyester (UMPE), but this polyester may contain a urethane bond as well as a urea bond. The molar ratio of the urea bond content to the urethane bond content is usually 100/0 to 10/90, preferably 80/20 to 20/80, and more preferably 60/40 to 30/70. When the molar ratio of the urea bond is less than 10%, the hot offset resistance is deteriorated.

  Modified polyester such as urea-modified polyester (UMPE) is produced by a one-shot method or the like. The weight average molecular weight of the modified polyester such as urea-modified polyester (UMPE) is usually 10,000 or more, preferably 20,000 to 10,000,000, more preferably 30,000 to 1,000,000. If it is less than 10,000, the hot offset resistance deteriorates. The number average molecular weight of a modified polyester such as a urea-modified polyester is not particularly limited when a non-modified polyester (PE) described later is used, and may be a number average molecular weight that can be easily obtained to obtain the weight average molecular weight. In the case of a modified polyester such as UMPE alone, the number average molecular weight is usually 2000-15000, preferably 2000-10000, and more preferably 2000-8000. When it exceeds 20000, the low-temperature fixability and the glossiness when used in a full-color apparatus are deteriorated.

  In the present invention, the above modified polyester such as polyester modified with a urea bond (UMPE) is not only used alone, but also with this, unmodified polyester (PE) can be contained as a toner binder component. The combined use of PE improves low-temperature fixability and gloss when used in a full-color device, and is preferable to single use. Examples of PE include polycondensates of polyol PO and polycarboxylic acid PC similar to the polyester component of UMPE, and preferred ones are also the same as in UMPE. The weight average molecular weight (Mw) of PE is 10,000 to 300,000, preferably 14,000 to 200,000. Its Mn (number average molecular weight) is 1000 to 10000, preferably 1500 to 6000. For UMPE, not only unmodified polyesters but also those modified with chemical bonds other than urea bonds, such as those modified with urethane bonds, can be used in combination. UMPE and PE are preferably at least partially compatible with each other in terms of low-temperature fixability and hot offset resistance. Accordingly, the polyester component of UMPE and PE preferably have similar compositions. The weight ratio of UMPE to PE when PE is contained is usually 5/95 to 80/20, preferably 5/95 to 30/70, more preferably 5/95 to 25/75, particularly preferably 7/93. ~ 20/80. When the weight ratio of UMPE is less than 5%, the hot offset resistance is deteriorated, and it is disadvantageous in terms of both heat-resistant storage stability and low-temperature fixability.

  The hydroxyl value (mgKOH / g) of PE is preferably 5 or more, and the acid value (mgKOH / g) of PE is usually 1 to 30, preferably 5 to 20. By giving an acid value, it tends to be negatively charged, and further, the affinity between the paper and the toner is good when fixing to paper, and the low-temperature fixability is improved. However, when the acid value exceeds 30, there is a tendency to deteriorate with respect to the stability of charging, particularly the environmental fluctuation. In the polymerization reaction, if the acid value is touched, it will cause blurring in the granulation process, making it difficult to control the emulsification.

Specifically, the hydroxyl value and acid value of PE are determined by the following procedure.
Measuring device: Potentiometric automatic titrator DL-53 Titrator (Metler Toledo)
Electrode used: DG113-SC (Metler Toledo)
Analysis software: LabX Light Version 1.00.000
Calibration of the apparatus: Use a mixed solvent of 120 ml of toluene and 30 ml of ethanol.
Measurement temperature: 23 ° C
The measurement conditions are as follows.
Stir
Speed [%] 25
Time [s] 15
EQP titration
Titrant / Sensor
Titrant CH3ONa
Concentration [mol / L] 0.1
Sensor DG115
Unit of measurement mV
Predispensing to volume
Volume [mL] 1.0
Wait time [s] 0
Titrant addition Dynamic
dE (set) [mV] 8.0
dV (min) [mL] 0.03
dV (max) [mL] 0.5
Measure mode Equilibrium controlled
dE [mV] 0.5
dt [s] 1.0
t (min) [s] 2.0
t (max) [s] 20.0
Recognition
Threshold 100.0
Steepest jump only No
Range No
Tendency None
Termination
at maximum volume [mL] 10.0
at potential No
at slope No
after number EQPs Yes
n = 1
comb. termination conditions No
Evaluation
Procedure Standard
Potential 1 No
Potential 2 No
Stop for reevaluation No
(Measurement method of acid value)
Measurement is performed under the following conditions in accordance with the measurement method described in JIS K0070-1992.
Sample preparation: 0.5 g of polyester (0.3 g for ethyl acetate-soluble component) is added to 120 ml of toluene and dissolved by stirring at room temperature (23 ° C.) for about 10 hours. Further, 30 ml of ethanol is added to prepare a sample solution.

  The measurement can be calculated by the apparatus described above, but specifically, the calculation is performed as follows.

Titrate with a pre-standardized N / 10 caustic potash to alcohol solution, and determine the acid value from the consumption of the alcohol potash solution by the following calculation.
Acid value = KOH (ml) x N x 56.1 / sample weight
(N is a factor of N / 10KOH)
(Measurement method of hydroxyl value)
Weigh accurately 0.5 g of sample into a 100 ml volumetric flask and add 5 ml of acetylating reagent correctly. Then, it is immersed in a bath at 100 ° C. ± 5 ° C. and heated. After 1-2 hours, the flask is removed from the bath, allowed to cool, water is added and shaken to decompose acetic anhydride. Furthermore, in order to complete the decomposition, the flask is again heated in a bath for 10 minutes or more and allowed to cool, and then the wall of the flask is thoroughly washed with an organic solvent. This solution is subjected to potentiometric titration with an N / 2 potassium hydroxide ethyl alcohol solution using the above electrode to obtain the OH value.

  In the present invention, the glass transition point (Tg) of the toner binder is usually 40 to 70 ° C., preferably 40 to 60 ° C. If it is less than 40 ° C., the heat resistance of the toner deteriorates, and if it exceeds 70 ° C., the low-temperature fixability becomes insufficient. Due to the coexistence of a modified polyester such as a urea-modified polyester resin, the toner of the present invention tends to have good heat-resistant storage stability even when the glass transition point is low, as compared with known polyester-based toners.

  Next, the release agent will be described.

  As the wax used in the toner of the present invention, a low melting point wax having a melting point of 50 to 120 ° C. works more effectively as a release agent in the dispersion with the binder resin between the fixing roller and the toner interface, This shows an effect against high temperature offset resistance without applying a release material such as oil to the fixing roller.

  The melting point of the wax in the present invention was the maximum endothermic peak measured by a differential scanning calorimeter (DSC).

  The following materials can be used as the wax component that functions as a release agent that can be used in the present invention. That is, as specific examples, waxes and waxes include plant waxes such as carnauba wax, cotton wax, wood wax, rice wax, animal waxes such as beeswax and lanolin, mineral waxes such as ozokerite and cercin, And petroleum waxes such as paraffin, microcrystalline, and petrolatum. In addition to these natural waxes, synthetic hydrocarbon waxes such as Fischer-Tropsch wax and polyethylene wax, and synthetic waxes such as esters, ketones and ethers can be used. Furthermore, fatty acid amides such as 12-hydroxystearic acid amide, stearic acid amide, phthalic anhydride imide, chlorinated hydrocarbon, and poly n-stearyl methacrylate, poly n-lauryl methacrylate, which are low molecular weight crystalline polymer resins A crystalline polymer having a long alkyl group in the side chain, such as a polyacrylate homopolymer or copolymer (for example, a copolymer of n-stearyl acrylate-ethyl methacrylate, etc.) can also be used.

  Next, the colorant will be described.

  As the colorant used in the present invention, all known dyes and pigments can be used. For example, carbon black, nigrosine dye, iron black, naphthol yellow S, Hansa yellow (10G, 5G, G), cadmium yellow, yellow Iron oxide, ocher, yellow lead, titanium yellow, polyazo yellow, oil yellow, Hansa yellow (GR, A, RN, R), pigment yellow L, benzidine yellow (G, GR), permanent yellow (NCG), Vulcan fast Yellow (5G, R), Tartrazine Lake, Quinoline Yellow Lake, Anthrazan Yellow BGL, Isoindolinone Yellow, Bengala, Red Dan, Lead Zhu, Cadmium Red, Cadmium Mercury Red, Antimon Zhu, Permanent Red 4R , Para red, phissa red, parac Luort Nitroaniline Red, Resol Fast Scarlet G, Brilliant Fast Scarlet, Brilliant Carnmin BS, Permanent Red (F2R, F4R, FRL, FRLL, F4RH), Fast Scarlet VD, Belkan Fast Rubin B, Brilliant Scarlet G, Resol Rubin GX, Permanent Red F5R, Brilliant Carmine 6B, Pogment Scarlet 3B, Bordeaux 5B, Toluidine Maroon, Permanent Bordeaux F2K, Helio Bordeaux BL, Bordeaux 10B, Bon Maroon Light, Bon Maroon Medium, Eosin Lake, Rhodamine Lake B, Rhodamine Lake Y, Alizarin Lake, Thioindigo Red B, Thioindigo Maroon, Oil Red, Quinacridone Red, Pi Zoron Red, Polyazo Red, Chrome Vermillion, Benzidine Orange, Perinone Orange, Oil Orange, Cobalt Blue, Cerulean Blue, Alkaline Blue Lake, Peacock Blue Lake, Victoria Blue Lake, Metal Free Phthalocyanine Blue, Phthalocyanine Blue, Fast Sky Blue, Indance Ren Blue (RS, BC), Indigo, Ultramarine Blue, Bitumen, Anthraquinone Blue, Fast Violet B, Methyl Violet Lake, Cobalt Purple, Manganese Purple, Dioxane Violet, Anthraquinone Violet, Chrome Green, Zinc Green, Chrome Oxide, Pyridian, Emerald Green , Pigment Green B, Naphthol Green B, Green Gold, Acid Green Lake, Malachite Gree Lake, phthalocyanine green, anthraquinone green, titanium oxide, zinc white, litbon and mixtures thereof can be used. The content of the colorant is usually 1 to 15% by weight, preferably 3 to 10% by weight, based on the toner.

  The colorant used in the present invention can also be used as a master batch combined with a resin.

  As the binder resin to be kneaded together with the production of the masterbatch or the masterbatch, in addition to the modified and unmodified polyester resins mentioned above, styrene such as polystyrene, poly p-chlorostyrene, polyvinyltoluene, and polymers of substituted products thereof; Styrene-p-chlorostyrene copolymer, styrene-propylene copolymer, styrene-vinyltoluene copolymer, styrene-vinylnaphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer Styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-α- Chloromethyl methacrylate copolymer, Tylene-acrylonitrile copolymer, styrene-vinyl methyl ketone copolymer, styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, styrene-maleic acid copolymer, styrene-malein Styrene copolymers such as acid ester copolymers; polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, polyester, epoxy resin, epoxy polyol resin, polyurethane, polyamide, polyvinyl butyral, poly Acrylic resin, rosin, modified rosin, terpene resin, aliphatic or alicyclic hydrocarbon resin, aromatic petroleum resin, chlorinated paraffin, paraffin wax, etc. The

  The master batch can be obtained by mixing and kneading a resin for a master batch and a colorant under a high shear force to obtain a master batch. At this time, an organic solvent can be used in order to enhance the interaction between the colorant and the resin. In addition, a so-called flushing method, which is a wet cake of a colorant, is a method of mixing and kneading an aqueous paste containing water of a colorant together with a resin and an organic solvent, transferring the colorant to the resin side, and removing moisture and organic solvent components. Since it can be used as it is, it does not need to be dried and is preferably used. For mixing and kneading, a high shear dispersion device such as a three-roll mill is preferably used.

An external additive is used to assist the fluidity, developability, and chargeability of the colored particles obtained in the present invention. As this external additive, inorganic fine particles can be preferably used. The primary particle diameter of the inorganic fine particles is preferably 5 mμ to 2 μm, and particularly preferably 5 mμ to 500 mμ. Moreover, it is preferable that the specific surface area by BET method is 20-500 m < ² > / g. The proportion of the inorganic fine particles used is preferably 0.01 to 5% by weight of the toner, and particularly preferably 0.01 to 2.0% by weight. Specific examples of the inorganic fine particles include, for example, silica, alumina, titanium oxide, barium titanate, magnesium titanate, calcium titanate, strontium titanate, zinc oxide, tin oxide, quartz sand, clay, mica, wollastonite, diatomaceous earth. Examples include soil, chromium oxide, cerium oxide, pengala, antimony trioxide, magnesium oxide, zirconium oxide, barium sulfate, barium carbonate, calcium carbonate, silicon carbide, and silicon nitride. Among these, as the fluidity imparting agent, it is preferable to use hydrophobic silica fine particles and hydrophobic titanium oxide fine particles in combination. In particular, when stirring and mixing is performed using an average particle size of both fine particles of 50 mμ or less, the electrostatic force and van der Waals force with the toner are remarkably improved, so that a desired charge level is obtained. It is clear that even with stirring and mixing inside the developing machine, a fluidity-imparting agent is not detached from the toner, a good image quality that does not generate fireflies and the like can be obtained, and the residual toner can be further reduced. became.

  Titanium oxide fine particles are excellent in environmental stability and image density stability, but have a tendency to deteriorate the charge rising characteristics, and therefore, if the amount of titanium oxide fine particles added is larger than the amount of silica fine particles added, the side effect of It can be considered large. However, when the addition amount of the hydrophobic silica fine particles and the hydrophobic titanium oxide fine particles is in the range of 0.3 to 1.5 wt%, the charge rising characteristics are not greatly impaired, and the desired charge rising characteristics can be obtained, that is, repeated copying. It has been found that stable image quality can be obtained and toner blowing can be suppressed even if the process is performed.

  The resin for toner binder can be produced by the following method. Polyol (PO) and polycarboxylic acid (PC) are heated to 150-280 ° C. in the presence of a known esterification catalyst such as tetrabutoxytitanate, dibutyltin oxide, etc., and the generated water is distilled off as necessary. Thus, a polyester having a hydroxyl group is obtained. Next, this is reacted with polyisocyanate (PIC) at 40 to 140 ° C. to obtain a polyester prepolymer (A) having an isocyanate group. Further, this A is reacted with amines (B) at 0 to 140 ° C. to obtain a polyester (UMPE) modified with a urea bond. The number average molecular weight of this modified polyester is 1000 to 10000, preferably 1500 to 6000. When reacting PIC and when reacting A and B, a solvent can be used if necessary. Usable solvents include aromatic solvents (toluene, xylene, etc.); ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.); esters (ethyl acetate, etc.); amides (dimethylformamide, dimethylacetamide, etc.) and ethers And those inert to isocyanates (PIC), such as tetrahydrofuran (such as tetrahydrofuran). When polyester (PE) that is not modified with a urea bond is used in combination, PE is produced by the same method as the polyester having a hydroxyl group, and this is dissolved and mixed in the solution after completion of the above UMPE reaction.

  The properties of the toner of the present invention will be described below.

  In the toner of the present invention, the ratio (Dv / Dn) of the volume average particle diameter (Dv) to the number average particle diameter (Dn) is 1.00 to 1.30, which is high resolution and high image quality. It is possible to obtain the toner. Furthermore, in the case of a two-component developer, even if a long-term balance of the toner is performed, fluctuations in the particle size of the toner in the developer are reduced, and good and stable developability even with long-term stirring in the developing device. Is possible. If Dv / Dn exceeds 1.30, the variation in particle size of individual toner particles is large, and the behavior of the toner varies during development and the like, and the reproducibility of minute dots is impaired. Therefore, a high-quality image cannot be obtained. More preferably, Dv / Dn is in the range of 1.00 to 1.20, and a better image can be obtained.

  Furthermore, in the toner of the present invention, the volume average particle diameter Dv is preferably 3.0 to 7.0 μm. In general, it is said that the smaller the particle size of the toner, the more advantageous it is to obtain a high-resolution and high-quality image, but it is disadvantageous for transferability and cleaning properties. is there. Further, when the volume average particle diameter is smaller than the above range, in the case of a two-component developer, the toner is fused to the surface of the carrier during long-term agitation in the developing device, and the charging ability of the carrier is reduced. When it is used, toner filming on the developing roller and toner fusion to a member such as a blade for thinning the toner are likely to occur. These phenomena are greatly related to the content of fine powder. In particular, if the volume average particle diameter Dv exceeds 2%, the adhesion to the carrier and the charging stability at a high level are hindered. It becomes. Conversely, when the toner particle size is larger than the above range, it becomes difficult to obtain a high-resolution and high-quality image, and the toner particle size when the balance of the toner in the developer is performed. In many cases, fluctuations of It was also clarified that the volume average particle diameter / number average particle diameter was larger than 1.30.

  Hereafter, the measuring method regarding the property of the toner of this invention is shown.

(Toner particle size)
The average particle size and the particle size distribution of the toner are determined by the car Coulter counter method. Examples of the measuring device for the particle size distribution of toner particles include Coulter Counter TA-II and Coulter Multisizer II (both manufactured by Coulter). In the present invention, measurement was performed using a Coulter Counter TA-II type connected to an interface (Nichiken Giken) that outputs number distribution and volume distribution and a PC9801 personal computer (manufactured by NEC).

  The measurement method is described below.

  First, 0.1 to 5 ml of a surfactant (preferably alkylbenzene sulfonate) is added as a dispersant to 100 to 150 ml of an aqueous electrolytic solution. Here, the electrolytic solution is a solution prepared by preparing a 1% NaCl aqueous solution using primary sodium chloride. For example, ISOTON-II (manufactured by Coulter) can be used. Here, 2 to 20 mg of a measurement sample is further added. The electrolytic solution in which the sample is suspended is subjected to a dispersion treatment with an ultrasonic disperser for about 1 to 3 minutes, and the measurement device is used to measure the volume and number of toner particles or toner using a 100 μm aperture as an aperture. Volume distribution and number distribution are calculated.

  As channels, 2.00 to less than 2.52 μm; 2.52 to less than 3.17 μm; 3.17 to less than 4.00 μm; 4.00 to less than 5.04 μm; 5.04 to less than 6.35 μm; 6 Less than 35 to 8.00 μm; less than 8.00 to less than 10.08 μm; less than 10.08 to less than 12.70 μm; less than 12.70 to less than 16.00 μm; less than 16.00 to less than 20.20 μm; Uses 13 channels of less than 40 μm; 25.40 to less than 32.00 μm; 32.00 to less than 40.30 μm, and targets particles having a particle size of 2.00 μm to less than 40.30 μm. The volume-based volume average particle diameter (Dv) obtained from the volume distribution according to the present invention and the number average particle diameter (Dn) obtained from the number distribution and the ratio Dv / Dn were obtained.

(Particle size of 2 μm or less)
The particle ratio and circularity of the toner of the present invention having a volume average particle diameter (Dv) of 2 μm or less can be measured by a flow type particle image analyzer FPIA-2000 (manufactured by Toa Medical Electronics Co., Ltd.). As a specific measuring method, 0.1 to 0.5 ml of a surfactant, preferably alkylbenzene sulfonate is added as a dispersant to 100 to 150 ml of water from which impure solids have been removed in advance, and further measurement is performed. Add about 0.1-0.5g of sample. The suspension in which the sample is dispersed is obtained by performing dispersion treatment with an ultrasonic disperser for about 1 to 3 minutes and measuring the shape and distribution of the toner with the above apparatus at a dispersion concentration of 3000 to 10,000 / μl. .

  According to a further study of the present invention, in order to effectively exhibit low-temperature fixability while maintaining heat-resistant storage stability and to impart offset resistance after modification with a prepolymer, the acidic group-containing polyester resin It is preferable that the weight-average molecular weight of the THF-soluble component is 1,000 to 30,000. This is because when the amount is less than 1,000, the oligomer component increases, the heat-resistant storage stability is deteriorated, and when it exceeds 30,000, the modification with the prepolymer is insufficient due to steric hindrance and the offset resistance is deteriorated.

The molecular weight according to the present invention is measured by GPC (gel permeation chromatography) as follows. Stabilize the column in a heat chamber at 40 ° C., flow THF at a flow rate of 1 ml / min through the column at this temperature, and prepare a THF sample solution of resin prepared at a sample concentration of 0.05 to 0.6% by weight. Is measured by injecting 50 to 200 μl. In measuring the molecular weight of the sample, the molecular weight distribution of the sample was calculated from the relationship between the logarithmic value of the prepared calibration curve and the count using several types of monodisperse polystyrene standard samples. As a standard polystyrene sample for preparing a calibration curve, for example, Pressure Chemical Co. Or molecular weight made by Toyo Soda Industry Co., Ltd. is 6 × 10 ² , 2.1 × 10 ³ , 4 × 10 ³ , 1.75 × 10 ⁴ , 5.1 × 10 ⁴ , 1.1 × 10 ⁵ , 3.9. It is suitable to use x10 ⁵ , 8.6 × 10 ⁵ , 2 × 10 ⁶ , 4.48 × 10 ⁶ , and use at least about 10 standard polystyrene samples. An RI (refractive index) detector is used as the detector.

  In addition, by adjusting the acid value of the acidic group-containing polyester resin to 1.0 to 50.0 (KOHmg / g), grain size control by adding a basic compound, low temperature fixability, high temperature offset resistance, heat resistant storage stability, It is possible to improve toner characteristics such as charging stability. That is, when the acid value exceeds 50.0 (KOHmg / g), the extension or crosslinking reaction of the modified polyester becomes insufficient, and the high-temperature offset resistance is affected, and when it is less than 1.0 (KOHmg / g) This is because a dispersion stabilizing effect due to the base compound during production cannot be obtained, and the elongation or cross-linking reaction of the modified polyester tends to proceed, resulting in a problem in production stability.

  The method for measuring the acid value of the polyester resin of the present invention is based on a method based on JIS K0070. However, when the sample does not dissolve, a solvent such as dioxane or THF is used as the solvent.

  An acid value is determined using the method similar to the measurement of the acid value of polyester (PE).

  In the present invention, the heat-resistant storage performance of the main component of the polyester resin after modification, that is, the binder resin depends on the glass transition point of the polyester resin before modification, so that the glass transition point of the polyester resin is 35 ° C. to 65 ° C. It is preferable to design. That is, if it is less than 35 ° C., the heat-resistant storage stability is insufficient, and if it exceeds 65 ° C., it adversely affects low-temperature fixing.

  The glass transition point of the present invention is measured with a Rigaku THRMOFLEX TG8110 manufactured by Rigaku Corporation at a temperature increase rate of 10 ° C./min.

  A method for measuring Tg will be outlined. As an apparatus for measuring Tg, a TG-DSC system TAS-100 manufactured by Rigaku Corporation was used.

  First, about 10 mg of a sample is placed in an aluminum sample container, which is placed on a holder unit and set in an electric furnace. First, after heating from room temperature to 150 ° C. at a temperature rising rate of 10 ° C./min, the sample was allowed to stand at 150 ° C. for 10 min, the sample was cooled to room temperature and left for 10 min, and the temperature rising rate was again increased to 150 ° C. under a nitrogen atmosphere. DSC measurement was performed by heating at min. Tg was calculated from the tangent of the endothermic curve near the Tg and the base line using the analysis system in the TAS-100 system.

  According to a further study of the present invention, the prepolymer for modifying the polyester resin is an important binder resin component for realizing low-temperature fixability and high-temperature offset resistance, and its weight average molecular weight is 3,000 to 20, 000 is preferred. That is, when the weight average molecular weight is less than 3,000, it becomes difficult to control the reaction rate, and problems in production stability begin to occur. On the other hand, when the weight average molecular weight exceeds 20,000, sufficient modified polyester cannot be obtained and the offset resistance starts to be affected.

  Further examination of the present invention revealed that the toner acid value is a more important index than the binder resin acid value for low-temperature fixability and high-temperature offset resistance. The toner acid value of the present invention is derived from the terminal carboxyl group of the unmodified polyester. The unmodified polyester preferably has an acid value of 0.5 to 40.0 (KOHmg / g) in order to control low-temperature fixability (fixing lower limit temperature, hot offset occurrence temperature, etc.) as a toner. In other words, when the toner acid value exceeds 40.0 (KOHmg / g), the modified polyester is insufficiently stretched or cross-linked, affecting high-temperature offset resistance, and less than 0.5 (KOHmg / g). In this case, the dispersion stabilizing effect due to the base compound at the time of production cannot be obtained, and the extension or crosslinking reaction of the modified polyester tends to proceed, resulting in a problem in production stability.

  The acid value is measured by a method based on JIS K0070. However, when the sample does not dissolve, a solvent such as dioxane or THF is used as the solvent.

  The acid value is determined using a method similar to the measurement of the acid value of the polyester (PE) already described above.

  The glass transition point of the toner of the present invention is preferably 40 to 70 ° C. in order to obtain low temperature fixability, heat resistant storage stability and high durability. That is, when the glass transition point is less than 40 ° C., blocking in the developing machine and filming to the photoreceptor are liable to occur, and when it exceeds 70 ° C., the low-temperature fixability tends to deteriorate.

  The toner of the present invention can be produced by the following method, but is not limited thereto.

(Toner production method in aqueous medium)
As the aqueous medium used in the present invention, water alone may be used, but a solvent miscible with water may be used in combination. Examples of the miscible solvent include alcohol (methanol, isopropanol, ethylene glycol, etc.), dimethylformamide, tetrahydrofuran, cellosolves (methylcellosolve, etc.), lower ketones (acetone, methyl ethyl ketone, etc.) and the like.

  In the present invention, a urea-modified polyester (UMPE) or the like can be obtained by reacting a reactive modified polyester such as a polyester prepolymer (A) having an isocyanate group with an amine (B) in an aqueous medium. As a method for stably forming a dispersion comprising a modified polyester such as urea-modified polyester or a reactive modified polyester such as prepolymer (A) in an aqueous medium, a modified polyester such as urea-modified polyester or a pre-polymer can be used in an aqueous medium. Examples thereof include a method in which a composition of a toner raw material composed of reactive modified polyester such as polymer (A) is added and dispersed by shearing force. Reactive modified polyester such as prepolymer (A) and other toner composition (hereinafter referred to as toner raw material), colorant, colorant masterbatch, release agent, charge control agent, unmodified polyester resin, etc. Although mixing may be performed when forming the dispersion in the medium, it is more preferable to mix the toner raw materials in advance and then add and disperse the mixture in the aqueous medium. In the present invention, other toner materials such as a colorant, a release agent, and a charge control agent do not necessarily have to be mixed when forming particles in an aqueous medium, but after the particles are formed. , May be added. For example, after forming particles containing no colorant, the colorant can be added by a known dyeing method.

  The dispersion method is not particularly limited, and known equipment such as a low-speed shear method, a high-speed shear method, a friction method, a high-pressure jet method, and an ultrasonic wave can be applied. In order to make the particle size of the dispersion 2 to 20 μm, a high-speed shearing type is preferable. When a high-speed shearing disperser is used, the rotational speed is not particularly limited, but is usually 1000 to 30000 rpm, preferably 5000 to 20000 rpm. The dispersion time is not particularly limited, but in the case of a batch method, it is usually 0.1 to 5 minutes. The temperature during dispersion is usually 0 to 150 ° C. (under pressure), preferably 40 to 98 ° C. Higher temperatures are preferred in that the dispersion of the urea-modified polyester or prepolymer (A) has a low viscosity and is easy to disperse.

  The amount of the aqueous medium used is usually 50 to 2000 parts by weight, preferably 100 to 1000 parts by weight, based on 100 parts of the toner composition containing a polyester such as urea-modified polyester and prepolymer (A). If the amount is less than 50 parts by weight, the dispersion state of the toner composition is poor, and toner particles having a predetermined particle diameter cannot be obtained. If it exceeds 20000 parts by weight, it is not economical. Moreover, a dispersing agent can also be used as needed. It is preferable to use a dispersant because the particle size distribution becomes sharp and the dispersion is stable.

  Various dispersants for emulsifying and dispersing the oily phase in which the toner composition is dispersed are used in the liquid containing water. Such a dispersant includes a surfactant, an inorganic fine particle dispersant, a polymer fine particle dispersant and the like.

  As surfactants, anionic surfactants such as alkylbenzene sulfonates, α-olefin sulfonates, phosphate esters, alkylamine salts, amino alcohol fatty acid derivatives, polyamine fatty acid derivatives, amine salt types such as imidazoline, Quaternary ammonium salt type cationic surfactants such as alkyltrimethylammonium salt, dialkyldimethylammonium salt, alkyldimethylbenzylammonium salt, pyridinium salt, alkylisoquinolinium salt, benzethonium chloride, fatty acid amide derivative, polyhydric alcohol Nonionic surfactants such as derivatives, for example, amphoteric surfactants such as alanine, dodecyldi (aminoethyl) glycine, di (octylaminoethyl) glycine and N-alkyl-N, N-dimethylammonium betaine. It is.

  Further, by using a surfactant having a fluoroalkyl group, the effect can be obtained in a very small amount. Preferred anionic surfactants having a fluoroalkyl group include fluoroalkyl carboxylic acids having 2 to 10 carbon atoms and metal salts thereof, disodium perfluorooctanesulfonyl glutamate, 3- [omega-fluoroalkyl (C6-C11 ) Oxy] -1-alkyl (C3-C4) sodium sulfonate, 3- [omega-fluoroalkanoyl (C6-C8) -N-ethylamino] -1-propanesulfonic acid sodium, fluoroalkyl (C11-C20) carvone Acids and metal salts, perfluoroalkylcarboxylic acids (C7 to C13) and metal salts thereof, perfluoroalkyl (C4 to C12) sulfonic acids and metal salts thereof, perfluorooctanesulfonic acid diethanolamide, N-propyl-N- ( 2-hydroxyethyl) -Fluorooctanesulfonamide, perfluoroalkyl (C6-C10) sulfonamidopropyltrimethylammonium salt, perfluoroalkyl (C6-C10) -N-ethylsulfonylglycine salt, monoperfluoroalkyl (C6-C16) ethyl phosphate, etc. Is mentioned.

  Product names include Surflon S-111, S-112, S-113 (Asahi Glass Co., Ltd.), Florard FC-93, FC-95, FC-98, FC-129 (Sumitomo 3M Co., Ltd.), Unidyne DS-101. DS-102 (Daikin Kogyo Co., Ltd.), MegaFuck F-110, F-120, F-113, F-191, F-812, F-833 (Dainippon Ink Co., Ltd.), Xtop EF-102 , 103, 104, 105, 112, 123A, 123B, 306A, 501, 201, 204 (manufactured by Tochem Products), and Fgentent F-100, F150 (manufactured by Neos).

  Examples of cationic surfactants include aliphatic primary, secondary or secondary amine acids having a fluoroalkyl group, aliphatic quaternary ammonium salts such as perfluoroalkyl (C6-C10) sulfonamidopropyltrimethylammonium salt, benza Luconium salt, benzethonium chloride, pyridinium salt, imidazolinium salt, trade names include Surflon S-121 (Asahi Glass), Florard FC-135 (Sumitomo 3M), Unidyne DS-202 (Daikin Industries) Megafac F-150, F-824 (manufactured by Dainippon Ink, Inc.), Xtop EF-132 (manufactured by Tochem Products), and Footgent F-300 (manufactured by Neos).

  Moreover, tricalcium phosphate, calcium carbonate, acid value titanium, colloidal silica, hydroxyapatite, etc. can be used as an inorganic compound dispersant which is hardly soluble in water.

  Further, the same effect as that of the inorganic dispersant was confirmed for the fine particle polymer. For example, MMA polymer fine particles 1 μm and 3 μm, styrene fine particles 0.5 μm and 2 μm, styrene-acrylonitrile fine particle polymer 1 μm, (PB-200H (Kao) SGP (Soken), Technopolymer SBX (Sekisui Plastics), SGP-3G (Soken) Micropearl (Sekisui Fine Chemical)).

  In addition, as a dispersant that can be used in combination with the above inorganic dispersant and fine particle polymer, the dispersed droplets may be stabilized by a polymer protective colloid. For example, acrylic acid, methacrylic acid, α-cyanoacrylic acid, α-cyanomethacrylic acid, itaconic acid, crotonic acid, fumaric acid, maleic acid or maleic anhydride and other (meth) acrylic monomers containing hydroxyl groups Bodies such as β-hydroxyethyl acrylate, β-hydroxyethyl methacrylate, β-hydroxypropyl acrylate, β-hydroxypropyl methacrylate, γ-hydroxypropyl acrylate, γ-hydroxypropyl methacrylate, 3-acrylate Chloro-2-hydroxypropyl, 3-chloro-2-hydroxypropyl methacrylate, diethylene glycol monoacrylate, diethylene glycol monomethacrylate, glycerol monoacrylate, glycerol monomethacrylate, N -Methylol acrylamide, N-methylol methacrylamide, etc., vinyl alcohol or ethers with vinyl alcohol, such as vinyl methyl ether, vinyl ethyl ether, vinyl propyl ether, etc., or esters of compounds containing vinyl alcohol and carboxyl groups, such as Pinyl acetate, pinyl propionate, vinyl butyrate, acrylamide, methacrylamide, diacetone acrylamide or their methylol compounds, acid chlorides such as acrylic acid chloride, methacrylic acid chloride, pinyl pyridine, vinyl pyrrolidone, vinyl imidazole, ethylene imine, etc. Homopolymers or copolymers such as those having nitrogen atoms or heterocyclic rings thereof, polyoxyethylene, polyoxypropylene, polymers Oxyethylene alkylamine, polyoxypropylene alkylamine, polyoxyethylene alkylamide, polyoxypropylene alkylamide, polyoxyethylene nonyl phenyl ether, polyoxyethylene lauryl phenyl ether, polyoxyethylene stearyl phenyl ester, polyoxyethylene nonylphenyl Polyoxyethylenes such as esters, celluloses such as methyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose can be used.

  The elongation and / or crosslinking reaction time is selected, for example, depending on the reactivity of the isocyanate group structure of the prepolymer (A) and the amines (B), but is usually 10 minutes to 40 hours, preferably 2 to 24 hours. It's time. The reaction temperature is generally 0 to 150 ° C, preferably 40 to 98 ° C. Moreover, a well-known catalyst can be used as needed. Specific examples include dibutyltin laurate and dioctyltin laurate. In addition, as an extender and / or a crosslinking agent, the above-described amines (B) are used.

  The toner of the present invention can be used as a two-component developer. In this case, it may be used by mixing with a magnetic carrier, and the content ratio of the carrier and the toner in the developer is preferably 1 to 10 parts by weight of the toner with respect to 100 parts by weight of the carrier. As the magnetic carrier, conventionally known ones such as iron powder, ferrite powder, magnetite powder, magnetic resin carrier having a particle diameter of about 20 to 200 μm can be used. Examples of the coating material include amino resins such as urea-formaldehyde resin, melamine resin, benzoguanamine resin, urea resin, polyamide resin, and epoxy resin. Polyvinyl and polyvinylidene resins such as acrylic resins, polymethyl methacrylate resins, polyacrylonitrile resins, polyvinyl acetate resins, polyvinyl alcohol resins, polyvinyl butyral resins, polystyrene resins and styrene acrylic copolymer resins, Halogenated olefin resins such as vinyl, polyester resins such as polyethylene terephthalate resin and polybutylene terephthalate resin, polycarbonate resins, polyethylene resins, polyvinyl fluoride resins, polyvinylidene fluoride resins, polytrifluoroethylene resins, polyhexafluoro Propylene resin, copolymer of vinylidene fluoride and acrylic monomer, copolymer of vinylidene fluoride and vinyl fluoride, tetrafluoroethylene and vinylidene fluoride And fluoro such as terpolymers of non-fluoride monomers including, and silicone resins. Moreover, you may contain electrically conductive powder etc. in coating resin as needed. As the conductive powder, metal powder, carbon black, titanium oxide, tin oxide, zinc oxide or the like can be used. These conductive powders preferably have an average particle diameter of 1 μm or less. When the average particle diameter is larger than 1 μm, it becomes difficult to control electric resistance.

  The toner of the present invention can also be used as a one-component magnetic toner that does not use a carrier or a non-magnetic toner.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in more detail, this invention is not restrict | limited at all by these Examples. Hereinafter, a part shows a weight part.

(Production Example 1)
(Production of resin fine particle dispersion)
In a reaction vessel equipped with a stirrer and a thermometer, 683 parts of water, 11 parts of sodium salt of ethylene oxide methacrylate adduct sulfate (Eleminol RS-30, manufactured by Sanyo Chemical Industries), 83 parts of styrene, 83 parts of methacrylic acid, When 110 parts of butyl acrylate and 1 part of ammonium persulfate were added and stirred at 400 rpm for 15 minutes, a white emulsion was obtained. The system was heated to raise the system temperature to 75 ° C. and reacted for 5 hours. Further, 30 parts of a 1% ammonium persulfate aqueous solution was added, and the mixture was aged at 75 ° C. for 5 hours, and an aqueous vinyl resin (a copolymer of styrene-methacrylic acid-butyl acrylate-methacrylic acid ethylene oxide adduct sulfate sodium salt). A dispersion [resin fine particle dispersion 1] was obtained. The volume average particle diameter of [resin fine particle dispersion 1] measured with LA-920 was 105 nm. A portion of [resin fine particle dispersion 1] was dried to isolate the resin component. The resin content had a Tg of 59 ° C. and a weight average molecular weight of 150,000.

(Production of low molecular weight polyester-1)
229 parts by mass of bisphenol A ethylene oxide 2-mole adduct, 529 parts by mass of bisphenol A propion oxide 3-mole adduct, 208 parts by mass of terephthalic acid, 46 parts by mass of isophthalic acid And 2 parts by mass of dibutyltin oxide were added and reacted at 230 ° C. for 5 hours under normal pressure. Next, after reacting the reaction solution under a reduced pressure of 10 to 15 mmHg for 5 hours, 44 parts by weight of trimellitic anhydride was added to the reaction vessel and reacted at 180 ° C. for 2 hours under normal pressure. Low molecular weight polyester-1] was synthesized.

  The obtained [low molecular weight polyester-1] had a weight-average molecular weight (Mw) of 5,200, a glass transition temperature (Tg) of 45 ° C., and an acid value of 20 mgKOH / g.

(Prepolymer production)
Into a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introducing tube, 795 parts of bisphenol A ethylene oxide 2-mole adduct, 200 parts of isophthalic acid, 65 parts of terephthalic acid, and 2 parts of dibutyltin oxide were added at normal pressure. Under a nitrogen stream, condensation reaction was performed at 210 ° C. for 8 hours. Next, the reaction was continued for 5 hours while dehydrating under reduced pressure of 10 to 15 mmHg, then cooled to 80 ° C., and reacted with 170 parts of isophorone diisocyanate in ethyl acetate for 2 hours to obtain [Prepolymer-1]. The obtained [Prepolymer-1] had a weight average molecular weight of 5,000.

(Production of layered inorganic mineral-1 intercalated with fatty acid)
1200 parts by mass of water, 1550 parts by mass of hydrotalcite, and 15 parts by mass of stearic acid were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture is kneaded with an aqueous paste containing hydrotalcite, stearic acid and water at 150 ° C. for 60 minutes by a so-called flushing method to transfer stearic acid between the layers of hydrotalcite. Water was removed and a layered inorganic mineral intercalated with fatty acid was prepared. 15 parts by mass of methoxytrimethylsilane was added to the layered inorganic mineral obtained by intercalating the fatty acid thus obtained, and again kneaded and kneaded to obtain [Layered inorganic mineral-1 intercalated with fatty acid]. The obtained [layered inorganic mineral intercalated with fatty acid-1] was placed in a medium with a 1: 1 weight ratio of ethyl acetate and water, shaken, and allowed to stand for 1 hour. It was confirmed that the layered inorganic mineral was present at the interface between ethyl acetate and water.

(Manufacture of masterbatch-1)
1200 parts by mass of water, 174 parts of layered inorganic mineral-1 intercalated with the fatty acid, and 1570 parts of [low molecular polyester-1] were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded for 30 minutes at 150 ° C. with two rolls, rolled and cooled, and pulverized with a pulverizer (manufactured by Hosokawa Micron) to prepare [Masterbatch-1].

(Preparation of toner material oil dispersion-1)
In a beaker, 23.4 parts of [Prepolymer-1], 123.6 parts of [Polyester-1], 20 parts of [Masterbatch-1] and 80 parts of ethyl acetate were stirred and dissolved. Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Oil Material Dispersion-1].

(Production of Toner-1)
In a beaker, 529.5 parts of ion-exchanged water, 70 parts of [resin fine particle dispersion-1] and 0.5 part of sodium dodecylbenzenesulfonate are added to this aqueous dispersion while stirring with a TK homomixer at 12000 rpm. 405.1 parts of [Toner Material Oily Dispersion-1] were added and reacted while stirring for 30 minutes. Subsequently, the contents were transferred to a flask equipped with a cooling pipe and aged using a hot water bath. The organic solvent was removed from the ripened dispersion, followed by filtration, washing and drying, followed by air classification to obtain a spherical toner base. Further, 0.5 part of hydrophobic silica (H2000, manufactured by Clariant Japan) was added and mixed. In this case, the mixing operation was performed at a peripheral speed of 15 m / sec, and 30 seconds of mixing and rest for 1 minute were carried out for 5 cycles to obtain the final [Toner-1].

(Production Example 2)
(Production of layered inorganic mineral-2 intercalated with fatty acid)
1200 parts by mass of water, 1550 parts by mass of hydrotalcite, and 15 parts by mass of palmitic acid were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The so-called flushing method is used to mix and knead the aqueous paste containing hydrotalcite, palmitic acid and water at 150 ° C. for 60 minutes with a kneader to transfer the palmitic acid between the layers of hydrotalcite. Water was removed and a layered inorganic mineral intercalated with fatty acid was prepared. 2 parts by mass of methoxytrimethylsilane was added to the layered inorganic mineral intercalated with the fatty acid thus obtained, and the mixture was kneaded again with a kneader to obtain [Layered inorganic mineral-2 intercalated with fatty acid]. The obtained [layered inorganic mineral intercalated with fatty acid-2] was placed in a medium having a 1: 1 weight ratio of ethyl acetate and water, shaken, and allowed to stand for 1 hour. It was confirmed that the layered inorganic mineral was present at the interface between ethyl acetate and water.

(Manufacture of masterbatch-2)
1200 parts by mass of water, 174 parts of layered inorganic mineral-2 intercalated with the fatty acid, and 1570 parts of [low molecular polyester-1] were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded for 30 minutes at 150 ° C. with two rolls, rolled and cooled, and pulverized with a pulverizer (manufactured by Hosokawa Micron) to prepare [Masterbatch-2].

(Adjustment of toner material oil dispersion-2)
In a beaker, 23.4 parts of [Prepolymer-1], 123.6 parts of [Polyester-1], 20 parts of [Masterbatch-2] and 80 parts of ethyl acetate were stirred and dissolved. Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Oil Material Dispersion-2].

(Production of Toner-2)
In (Manufacturer of Toner-1), [Toner-1 Oily Dispersion-1] 405.1 parts were changed to [TonerMaterial Oily Dispersion-2] 405.1 parts. Similarly, [Toner-2] was obtained.

(Production Example 3)
(Production of layered inorganic mineral-3 intercalated with fatty acid)
1200 parts by mass of water, 1550 parts by mass of hydrotalcite, 12 parts by mass of stearic acid, and 3 parts by mass of palmitic acid were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture is kneaded with an aqueous paste containing hydrotalcite, stearic acid, palmitic acid and water at 150 ° C. for 60 minutes using a so-called flushing method, and stearic acid and palmitic acid are mixed with hydrotalcite. The layered inorganic mineral intercalated with fatty acid was prepared by transferring between the layers of the site, removing water. 2 parts by mass of methoxytrimethylsilane was added to the layered inorganic mineral obtained by intercalating the fatty acid thus obtained, and mixed and kneaded again with a kneader to obtain [Layered inorganic mineral-3 intercalated with fatty acid]. The obtained [layered inorganic mineral intercalated with fatty acid-3] was placed in a medium having a 1: 1 weight ratio of ethyl acetate and water, shaken, and left standing for 1 hour to intercalate the fatty acid. It was confirmed that the layered inorganic mineral was present at the interface between ethyl acetate and water.

(Manufacture of masterbatch-3)
1200 parts by mass of water, 174 parts of layered inorganic mineral-3 intercalated with the fatty acid, and 1570 parts of [low molecular polyester-1] were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded for 30 minutes at 150 ° C. with two rolls, rolled and cooled, and pulverized with a pulverizer (manufactured by Hosokawa Micron) to prepare [Masterbatch-3].

(Preparation of toner material oil dispersion-1)
In a beaker, 23.4 parts of [Prepolymer-1], 123.6 parts of [Polyester-1], 20 parts of [Masterbatch-3] and 80 parts of ethyl acetate were stirred and dissolved. Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Oil Material Dispersion-3].

(Production of Toner-3)
In (Manufacturing of Toner-1), except that 405.1 parts of [Toner Material Oily Dispersion-1] are changed to 405.1 parts of [TonerMaterial Oily Dispersion-3], Similarly, [Toner-3] was obtained.

(Production Example 4)
(Adjustment of toner material oil dispersion-4)
In a beaker, 23.4 parts of [Prepolymer-1], 141.6 parts of [Polyester-1], 2 parts of [Layered inorganic mineral intercalated with fatty acid] -1 and 80 parts of ethyl acetate were stirred and dissolved. . Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Oil Material Dispersion-4].

(Production of Toner-4)
In (Manufacturing of Toner-1), except that 405.1 parts of [Toner Material Oily Dispersion-1] are changed to 405.1 parts of [TonerMaterial Oily Dispersion-4], Similarly, [Toner-4] was obtained.

(Production Example 5)
(Manufacture of masterbatch-4)
1200 parts by mass of water, 174 parts of hydrotalcite, and 1570 parts of the [low molecular weight polyester-1] were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded for 30 minutes at 150 ° C. with two rolls, rolled and cooled, and pulverized with a pulverizer (manufactured by Hosokawa Micron Corporation) to prepare [Masterbatch-4].

(Adjustment of toner material oil dispersion-5)
In a beaker, 23.4 parts of [Prepolymer-1], 123.6 parts of [Polyester-1], 20 parts of [Masterbatch-4] and 80 parts of ethyl acetate were stirred and dissolved. Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Oil Material Dispersion-5].

(Production of Toner-5)
In (Manufacturing of Toner-1), [Toner-1 Oily Dispersion-1] 405.1 parts was changed to [TonerMaterial Oily Dispersion-5] 405.1 parts. Similarly, [Toner-5] was obtained.

(Production Example 6)
(Production of layered inorganic mineral-5 intercalated with fatty acid)
1200 parts by mass of water, 1550 parts by mass of hydrotalcite, and 15 parts by mass of stearic acid were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture is kneaded with an aqueous paste containing hydrotalcite, stearic acid and water at 150 ° C. for 60 minutes by a so-called flushing method to transfer stearic acid between the layers of hydrotalcite. Then, the water was removed to prepare [Layered inorganic mineral-5 intercalated with fatty acid]. The obtained [layered inorganic mineral intercalated with fatty acid-5] was shaken in a medium with a 1: 1 weight ratio of ethyl acetate and water, and when left standing for 1 hour, the fatty acid was intercalated. It was confirmed that the layered inorganic mineral was present in the aqueous phase.

(Manufacture of masterbatch-5)
1200 parts by mass of water, 174 parts of layered inorganic mineral-5 intercalated with the fatty acid, and 1570 parts of [low molecular polyester-1] were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded with a two-roller at 150 ° C. for 30 minutes, rolled and cooled, and pulverized with a pulverizer (manufactured by Hosokawa Micron) to prepare [Masterbatch-5].

(Adjustment of toner material oil dispersion-6)
In a beaker, 23.4 parts of [Prepolymer-1], 123.6 parts of [Polyester-1], 20 parts of [Masterbatch-1] and 80 parts of ethyl acetate were stirred and dissolved. Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Toner Material Oily Dispersion-6].

(Production of Toner-6)
In (Manufacturing of Toner-1), except that 405.1 parts of [Toner Material Oily Dispersion-1] are changed to 405.1 parts of [TonerMaterial Oily Dispersion-6], Similarly, [Toner-6] was obtained.

(Production Example 7)
(Production of layered inorganic mineral-6 intercalated with fatty acid)
1200 parts by mass of water, 1550 parts by mass of hydrotalcite, and 15 parts by mass of stearic acid were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture is kneaded with an aqueous paste containing hydrotalcite, stearic acid and water at 150 ° C. for 60 minutes by a so-called flushing method to transfer stearic acid between the layers of hydrotalcite. Water was removed and a layered inorganic mineral intercalated with fatty acid was prepared. 20 parts by mass of methoxytrimethylsilane was added to the layered inorganic mineral obtained by intercalating the fatty acid thus obtained, and mixed and kneaded again with a kneader to obtain [Layered inorganic mineral-6 intercalated with fatty acid]. The obtained [layered inorganic mineral-6 intercalated with fatty acid-6] was placed in a medium with a 1: 1 weight ratio of ethyl acetate and water, shaken, and allowed to stand for 1 hour. It was confirmed that the layered inorganic mineral was present in the ethyl acetate phase.

(Manufacture of masterbatch-6)
1200 parts by mass of water, 174 parts of layered inorganic mineral-6 intercalated with the fatty acid, and 1570 parts of [low molecular polyester-1] were mixed using a Henschel mixer (manufactured by Mitsui Mining Co., Ltd.). The mixture was kneaded with a two-roller at 150 ° C. for 30 minutes, rolled and cooled, and pulverized with a pulverizer (manufactured by Hosokawa Micron Corporation) to prepare [Masterbatch-6].

(Adjustment of toner material oil dispersion-7)
In a beaker, 23.4 parts of [Prepolymer-1], 123.6 parts of [Polyester-1], 20 parts of [Masterbatch-6] and 80 parts of ethyl acetate were stirred and dissolved. Separately, 15 parts of carnauba wax as a release agent, 20 parts of carbon black pigment, and 120 parts of ethyl acetate were placed in a bead mill and dispersed for 30 minutes. The two liquids were mixed and stirred for 5 minutes at a rotational speed of 12000 rpm using a TK homomixer, and then dispersed in a bead mill for 10 minutes. 2.9 parts of isophoronediamine was added to the dispersion, and the mixture was stirred for 5 minutes at 12000 rpm using a TK homomixer to obtain [Oil Material Dispersion-7].

(Production of Toner-7)
In (Manufacturing of Toner-1), [Toner-1 Oily Dispersion-1] 405.1 parts was changed to [TonerMaterial Oily Dispersion-7] 405.1 parts. Similarly, [Toner-2] was obtained.

  Table 1 shows the properties of the master batches used in Production Examples 1 to 7.

  Table 2 shows the properties of the toners obtained in Production Examples 1 to 7.

  Table 3 shows the performance evaluation results of the toners obtained in Examples 1 to 3 and Comparative Examples 1 to 4.

実施例及び比較例におけるトナー評価項目及び評価方法を下記に示す。

Toner evaluation items and evaluation methods in Examples and Comparative Examples are shown below.

(Dispersion diameter in master batch (volume average particle diameter Dv))
[Measurement sample adjustment]
The amount of layered inorganic mineral intercalated with fatty acids in the masterbatch / the amount of binder resin used in the masterbatch = 1/10 The ratio of the masterbatch and binder resin to the dispersant BYK Chemie Disperbyk-167 Is put into ethyl acetate in which 5 wt% is dissolved. At this time, the total amount of the master batch amount and the binder resin amount is adjusted to 5 wt%. The prepared sample is stirred for 12 hours.

[Dispersed particle size measurement]
The prepared sample is measured using a laser Doppler particle size distribution measuring device particle size distribution measuring device.

The measuring method is as follows.
Apparatus: nanotrac UPA-150EX (made by Nikkiso Co., Ltd.)
Method: (1) Measuring conditions of measuring instrument:
Distribution display: Volume Number of channels: 52
Measurement time: 15 sec
Particle refractive index: 1.54 Temperature: 25 ° C
Particle shape: Non-spherical Viscosity (CP): 0.441
Solvent Refractive Index: 1.37 Solvent Name: Ethyl Acetate (2) Add the sample diluent to be measured using a syringe or syringe so that it enters (1-100) while watching the sample loading of the measuring instrument.
(Dispersion diameter in toner (volume average particle diameter Dv))
[Measurement sample adjustment]
The layered inorganic intercalated with the fatty acid in the toner is charged into ethyl acetate in which 5 wt% Dispersbyk-167 manufactured by BYK Chemie is dissolved. At this time, the toner amount is adjusted to 5 wt%. The prepared sample is stirred for 12 hours. This is first separated by centrifugation and filtered using JIS standard (P3801) type 5 C filter paper, and the filtrate is used as a sample.

[Dispersed particle size measurement]
The prepared sample is measured using a laser Doppler particle size distribution measuring device particle size distribution measuring device.

The measuring method is as follows.
Apparatus: nanotrac UPA-150EX (made by Nikkiso Co., Ltd.)
Method: (1) Measuring conditions of measuring instrument:
Distribution display: Volume Number of channels: 52
Measurement time: 15 sec
Particle refractive index: 1.54 Temperature: 25 ° C
Particle shape: Non-spherical Viscosity (CP): 0.441
Solvent Refractive Index: 1.37 Solvent Name: Ethyl Acetate (2) Add the sample diluent to be measured using a syringe or syringe so that it enters (1-100) while watching the sample loading of the measuring instrument.
(Acid value (mgKOH / g))
According to the method specified in JISK0070. However, if the sample does not dissolve, dioxane or tetrahydrofuran is used as the solvent.

The acid value is specifically determined by the following procedure.
Measuring device: Potentiometric automatic titrator DL-53 Titrator (Metler Toledo)
Electrode used: DG113-SC (Metler Toledo)
Analysis software: LabX Light Version 1.00.000
Calibration of the apparatus: Use a mixed solvent of 120 ml of toluene and 30 ml of ethanol.
Measurement temperature: 23 ° C
The measurement conditions are as follows.
Stir
Speed [%] 25
Time [s] 15
EQP titration
Titrant / Sensor
Titrant CH3ONa
Concentration [mol / L] 0.1
Sensor DG115
Unit of measurement mV
Predispensing to volume
Volume [mL] 1.0
Wait time [s] 0
Titrant addition Dynamic
dE (set) [mV] 8.0
dV (min) [mL] 0.03
dV (max) [mL] 0.5
Measure mode Equilibrium controlled
dE [mV] 0.5
dt [s] 1.0
t (min) [s] 2.0
t (max) [s] 20.0
Recognition
Threshold 100.0
Steepest jump only No
Range No
Tendency None
Termination
at maximum volume [mL] 10.0
at potential No
at slope No
after number EQPs Yes
n = 1
comb. termination conditions No
Evaluation
Procedure Standard
Potential 1 No
Potential 2 No
Stop for reevaluation No
(Measurement method of acid value)
Measurement is performed under the following conditions in accordance with the measurement method described in JIS K0070-1992.
Sample preparation: 0.5 g of toner (0.3 g for ethyl acetate soluble component) is added to 120 ml of toluene and dissolved by stirring at room temperature (23 ° C.) for about 10 hours. Further, 30 ml of ethanol is added to prepare a sample solution.

  The measurement can be calculated by the apparatus described above, but specifically, the calculation is performed as follows.

Titrate with a pre-standardized N / 10 caustic potash to alcohol solution, and determine the acid value from the consumption of the alcohol potash solution by the following calculation.
Acid value = KOH (ml) x N x 56.1 / sample weight
(N is a factor of N / 10KOH)
(Glass transition point Tg (℃))
The glass transition point is measured with a Rigaku THRMOFLEX TG8110 manufactured by Rigaku Corporation at a temperature increase rate of 10 ° C./min.

  A method for measuring Tg will be outlined. As an apparatus for measuring Tg, a TG-DSC system TAS-100 manufactured by Rigaku Corporation was used.

  First, about 10 mg of a sample is placed in an aluminum sample container, which is placed on a holder unit and set in an electric furnace. First, after heating from room temperature to 150 ° C. at a temperature rising rate of 10 ° C./min, the sample was allowed to stand at 150 ° C. for 10 min, the sample was cooled to room temperature and left for 10 min, and the temperature rising rate was again increased to 150 ° C. under a nitrogen atmosphere. DSC measurement was performed by heating at min. Tg was calculated from the tangent of the endothermic curve near the Tg and the base line using the analysis system in the TAS-100 system.

(Dirt)
Using a digital full-color copier (imageColor 2800, manufactured by Ricoh), running 30,000 image charts with a 50% image area in single-color mode, and then stopping the blank image during development, and the developed photoconductor The above developer was transferred to tape, and the difference from the image density of the untransferred tape was measured with a 938 spectrocytometer (manufactured by X-Rite). The smaller the difference in image density, the better the background stain, and the better ones were ranked in the order of “◎”, “◯”, “Δ”, “×”.

(Toner scattering)
After continuous printing of 50,000 sheets using a digital full-color copying machine (imageColor 2800 manufactured by Ricoh), the degree of toner contamination in the machine was confirmed. A problem-free level was indicated by “◯”, a toner was observed, but a problem-free level was indicated by “Δ”, and a markedly contaminated and problematic problem was indicated by “X”.

(Electric charge evaluation)
1) Charge amount for 15 seconds stirring Charge 10 g of each toner and 100 g of ferrite carrier in a stainless steel pot up to 30% of the internal volume in an environment with a temperature of 28 ° C. and a humidity of 80%, and stir for 15 seconds at a stirring speed of 100 rpm. The charge amount (μC / g) of the developer was measured with [Toshiba Chemical Co., Ltd .: TB-200].
The charge amount of the toner was measured by the blow-off method.
2) Charge amount when stirred for 5 minutes Charge amount when stirred for 5 minutes as in 1) 3) Charge amount when stirred for 10 minutes as in 1) Charge amount when stirred for 10 minutes as in 1) (Charge stability)
(1) High-temperature and high-humidity environment charging stability In an environment of 40 ° C and 90% humidity, an image chart with a 7% image area in a monochrome mode is output with 100,000 copies on a digital full-color copier (ImagioColor 2800 manufactured by Ricoh). In the meantime, a part of the developer was sampled every 1000 sheets, and the charge amount was measured by the blow-off method to evaluate the charging stability. When the change in the charge amount was 5 μc / g or less, it was evaluated as ◯, when it was 10 μc / g or less, Δ when it exceeded 10 μc / g.
(2) Low-temperature and low-humidity charging stability
In an environment where the temperature is 10 ° C. and the humidity is 15%, the developer is printed every 1000 sheets while an image chart of 7% image area is output in a single-color mode on a digital full-color copier (imageColor 2800 manufactured by Ricoh). A part of the sample was sampled and the charge amount was measured by the blow-off method to evaluate the charge stability. When the change in the charge amount was 5 μc / g or less, it was evaluated as ◯, when it was 10 μc / g or less, Δ when it exceeded 10 μc / g.

  The charge amount measurement by the blow-off method (1) and (2) was performed as follows. In a test room with a temperature of 20 ° C. and a humidity of 50%, 10 g of each toner and 100 g of ferrite carrier are placed in a stainless steel pot up to 30% of the internal volume, and stirred for 10 minutes at a stirring speed of 100 rpm. g) was measured with [Toshiba Chemical Co., Ltd .: TB-200].

(Fixability evaluation)
A Ricoh Copier Co., Ltd. using a Teflon (registered trademark) roller as a fixing roller MF2200 A machine with a modified fixing part was used to set a Ricoh type 6200 paper for a copying test. The cold offset temperature (fixing lower limit temperature) and the hot offset temperature (hot offset resistant temperature) were determined by changing the fixing temperature. The minimum fixing temperature of the conventional low-temperature fixing toner is about 140 to 150 ° C. The evaluation conditions for low-temperature fixing are as follows: the paper feed linear speed is 120 to 150 mm / sec, the surface pressure is 1.2 kgf / cm ² , the nip width is 3 mm, and the high temperature offset is the paper feed linear speed of 50 mm / sec. The contact pressure was set to 2.0 kgf / cm ² and the nip width was 4.5 mm. The criteria for each characteristic evaluation are as follows.
Low-temperature fixability (5-level evaluation)
Good ◎: Less than 140 ° C., ○: 140-149 ° C., □: 150-159 ° C., Δ: 160-170 ° C .: 170 ° C. or higher Evil hot offset property (five-step evaluation)
Good: 201 ° C. or higher, ○: 200-191 ° C., □: 190-181 ° C., Δ: 180-171 ° C., X: 170 ° C. or lower
After the toner was stored at 50 ° C. for 8 hours, it was sieved with a 42 mesh sieve for 2 minutes, and the residual ratio on the wire mesh was regarded as heat resistant storage stability. A toner having better heat-resistant storage stability has a lower residual ratio. The following four levels were evaluated.
X: 30% or more
Δ: 20-30%
○: 10 to 20%
A: Less than 10%
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible.

Claims (17)

At least, in an organic solvent, a polymer having a site reactive with a compound having the compound and the active hydrogen group having an active hydrogen group, a binder resin, a colorant, a releasing agent and a fatty acid intercalated layered inorganic The organic solvent after the solution or dispersion in which the mineral is dissolved or dispersed is dispersed in an aqueous medium and the polymer having a site capable of reacting with the compound having an active hydrogen group is reacted or while reacting. Is a toner for the phenomenon of electrostatic charge image that has been removed, washed and dried,
In said toner, the dispersion diameter of the layered inorganic mineral intercalated with fatty acids, meets the 0.01μm~1μm volume average particle diameter Dv, and,
The toner for an electrostatic charge image phenomenon , wherein a frequency of 1 μm or more in volume average particle diameter Dv in the dispersion diameter is 2.5% or less .   The electrostatic image developing toner according to claim 1, wherein the layered inorganic mineral intercalated with the fatty acid is dissolved or dispersed in an organic solvent as a kneaded composite with the binder resin.   When the layered inorganic mineral intercalated with the fatty acid is placed in a medium having a weight ratio of 1: 1 of ethyl acetate and water and shaken for 1 hour, the layered inorganic mineral intercalated with the fatty acid is The electrostatic image developing toner according to claim 1, wherein the toner is present at an interface between ethyl acetate and water. The toner according to any one of claims 1 to 3, wherein the fatty acid is stearic acid. The 15-second stirring charge amount in the measured charge amount by blow-off method is -30 ± 5 μQ / g in an environment with a temperature of 28 ° C. and a humidity of 80%, and the 5-minute stirring charge amount and the 10-minute stirring charge amount are stirred for 15 seconds. the toner according to any one of claims 1 to 4 the change of the charge amount is equal to or less than 5μc / g with respect to the charge amount. The toner according to any one of claims 1 to 5, wherein the toner having a volume average particle diameter Dv is 3 to 7 [mu] m. The toner according to any one of claims 1 to 6, wherein a volume average particle diameter Dv / number average particle diameter Dn of the toner is 1.00 to 1.30. The toner according to any one of claims 1 to 7, wherein the toner having a volume average particle diameter Dv is 1-10% by number or less of particles 2 [mu] m. The toner according to any one of claims 1 to 8, characterized in that said binder resin is a polyester resin. The toner according to any one of claims 1 to 9, wherein the weight average molecular weight of THF-soluble matter of the polyester resin is 1,000 to 30,000. The polyester resin is an acidic group-containing polyesters, acid value of the acid group-containing polyester resin is 1.0 to 50.0 in (KOH mg / g) one wherein any one of claims 1 to 10, characterized in that it is The toner for developing an electrostatic image according to the description. The toner for developing an electrostatic charge image according to any one of claims 1 to 11 , wherein the acidic group-containing polyester resin has a glass transition point of 35 to 65 ° C. The toner according to any one of claims 1 to 12 weight-average molecular weight of a polymer having a compound capable of reacting site with active hydrogen group is 3,000 to 20,000. The toner according to any one of claims 1 to 13, wherein the acid value of the toner is 0.5~40.0 (KOHmg / g). The toner according to any one of claims 1 to 14, wherein the glass transition point of the toner is 40 to 70 ° C.. 16. The electrostatic image developing toner according to claim 1, wherein the toner is a toner used for a two-component developer. At least, in an organic solvent, a polymer having a site reactive with a compound having the compound and the active hydrogen group having an active hydrogen group, a binder resin, a colorant, a releasing agent, a fatty acid intercalated layered inorganic A polymer having a site capable of reacting with a compound having an active hydrogen group is obtained by dispersing the solution or dispersion in which a kneaded composite of a mineral and the binder resin is dissolved or dispersed in an aqueous medium containing resin fine particles. A method for producing a toner for an electrostatic charge image phenomenon, wherein the organic solvent is removed after the reaction or while reacting, washed and dried.
The dispersion diameter of the layered inorganic mineral intercalated with the fatty acid satisfies a volume average particle diameter Dv of 0.01 μm to 1 μm, and the frequency of the volume average particle diameter Dv of 1 μm or more satisfies 2.5 % or less. A method for producing a toner for an electrostatic charge image phenomenon, comprising a kneading composite step with the binder resin in a dispersed state.