JP5972129B2 - toner - Google Patents

Description

  The present invention relates to a toner used in a recording method such as electrophotography.

  In recent years, electrophotographic apparatuses are required to stably provide high-quality images even in various environments such as high temperature and high humidity and low temperature and low humidity.

  The toner is composed of a binder resin, a colorant, and other additives. In general, a charge control agent is added to impart desirable charging characteristics (charging speed, charging level, charging stability, etc.), aging stability, environmental stability, and the like. By adding the charge control agent, the toner characteristics are greatly improved.

  Patent Document 1 and Patent Document 2 propose a charge control agent for a pyrazolone monoazo metal complex compound for the purpose of providing a negatively chargeable toner having a high charge amount and a remarkably high charge rising property.

  In Patent Documents 1 and 2, there are three conditions: a normal environment of 25 ° C. and 50% RH (relative humidity), a low temperature and low humidity environment (10 ° C., 30% RH), and a constant temperature and high humidity environment (35 ° C., 85% RH). The amount of charge of toner exposed for 12 hours or 24 hours is measured to evaluate environmental stability. According to this, it is shown that a toner having a high chargeability, which has a practically sufficient charge amount, has an excellent charge start-up, and excellent environmental stability.

  However, in recent years, since electrophotographic apparatuses are used in various areas, there is a possibility that they will be exposed to harsher environments for a long period of time.

  For example, assuming an office during a long vacation, a situation where it is left in an ultra-high temperature and high humidity environment such as 40 ° C. and 95% RH for about 30 days may be considered.

  Assuming these situations, the toner simply added with the pyrazolone monoazo metal complex compound described in Patent Document 1 or Patent Document 2 is kept in a good state when left in a 40 ° C., 95% RH environment for 30 days. It becomes difficult to maintain. For this reason, when the left toner is used, the image density tends to decrease due to a decrease in charging performance (charging characteristics), and it may be difficult to obtain a stable image.

  Therefore, there is a demand for a toner that can solve the above problems.

JP 2004-086224 A WO2005 / 095523

  As described above, an object of the present invention is to stably provide a high-quality image even when the toner using a pyrazolone monoazo metal complex compound is left in a harsh environment.

The present invention is a toner having toner particles containing a charge control agent and a binder resin,
The charge control agent is an adsorption / desorption isotherm of N ₂ molecules at a temperature of 77K.
i) adsorption amount M1 of the adsorption process when the relative pressure p / p ₀ is 0.4, which is the ratio of the adsorption equilibrium pressure p for the saturated vapor pressure p ₀ is 3.0 cm ³ / g or more 8.0 cm ³ / g or less And
ii) The difference (M2−M1) between the adsorption amount M1 and the adsorption amount M2 (cm ³ / g) in the desorption process when the relative pressure p / p ₀ is 0.4 is 0.4 cm ³ / g or less. Yes,
The charge control agent has the following formula [1]

（式中、Ａ₁、Ａ₂及びＡ₃は、相互に独立して、水素原子、ニトロ基又はハロゲン原子を示す。Ｂ₁は水素原子又はアルキル基を示す。Ｍは、Ｆｅ原子、Ｃｒ原子、又は、Ａｌ原子を示し、Ｘ⁺は、水素イオン、アルカリ金属イオン、アンモニウムイオン、アルキルアンモニウムイオン、又は、これらの混合イオンを示す。）
で表される化合物を含有することを特徴とするトナーに関する。

(In the formula, A ₁ , A ₂ and A ₃ each independently represent a hydrogen atom, a nitro group or a halogen atom. B ₁ represents a hydrogen atom or an alkyl group. M represents an Fe atom or a Cr atom. Or an Al atom, and X ⁺ represents a hydrogen ion, an alkali metal ion, an ammonium ion, an alkylammonium ion, or a mixed ion thereof.
And a toner comprising the compound represented by formula (1):

  According to the present invention, it is possible to provide a toner capable of obtaining a high-quality image even when left in a harsh environment.

The N ₂ molecule absorption / desorption isotherm at 77K of the charge control agent (B-1) is shown. At 77K of the charge control agent (B-9), indicating the N ₂ molecule adsorption and desorption isotherms. A ghost evaluation image is shown.

  The toner is composed of a binder resin, a colorant, and other additives. In general, a charge control agent is added to impart desirable charging characteristics (charging speed, charging level, charging stability, etc.), aging stability, environmental stability, and the like. By adding the charge control agent, the toner characteristics are greatly improved.

  The inventors of the present invention have made extensive studies on this charge control agent. Further, it has been found that when a pyrazolone monoazo metal complex compound is used among various charge control agents, a negatively chargeable toner having a high charge amount and a remarkably high charge rising property can be obtained. Although the detailed reason why the pyrazolone monoazo metal complex has a high charge amount and a high charge rising property is not clear, it is considered that the chargeability is improved by having a pyrazolone skeleton in the ligand.

  However, simply using a pyrazolone monoazo metal complex compound makes it difficult to maintain the charge amount in a good state when left in a harsh environment for a long period of time, specifically at 40 ° C. and 95% RH for 30 days. become. For this reason, when the left toner is used, the image density tends to decrease due to a decrease in charging performance, and it may be difficult to obtain a stable image. This is considered to be due to the fact that the pyrazolone monoazo metal complex compound in the toner absorbs moisture and the charging performance is lowered by being left in a high temperature and high humidity environment of 40 ° C. and 95% RH for 30 days.

  Therefore, the present inventors have found that regarding the pyrazolone monoazo metal complex compound, it is necessary to control the aggregation state of the pyrazolone monoazo metal complex compound in order to maintain the charging performance even when left under harsh environmental conditions. It was.

That is, the charge control agent of the present invention has an adsorption / desorption isotherm of N ₂ molecules at a temperature of 77K.
i) adsorption amount M1 of the adsorption process when the relative pressure p / p ₀ is 0.4, which is the ratio of the adsorption equilibrium pressure p for the saturated vapor pressure p ₀ is 3.0 cm ³ / g or more 8.0 cm ³ / g or less And
ii) The difference (M2−M1) between the adsorption amount M1 and the adsorption amount M2 (cm ³ / g) in the desorption process when the relative pressure p / p ₀ is 0.4 is 0.4 cm ³ / g or less. Yes,
The charge control agent has the following formula [1]

（式中、Ａ₁、Ａ₂及びＡ₃は、相互に独立して、水素原子、ニトロ基又はハロゲン原子を示す。Ｂ₁は水素原子又はアルキル基を示す。Ｍは、Ｆｅ原子、Ｃｒ原子、又は、Ａｌ原子を示し、Ｘ⁺は、水素イオン、アルカリ金属イオン、アンモニウムイオン、アルキルアンモニウムイオン、又は、これらの混合イオンを示す。）
で表される化合物を含有することを特徴とする。

(In the formula, A ₁ , A ₂ and A ₃ each independently represent a hydrogen atom, a nitro group or a halogen atom. B ₁ represents a hydrogen atom or an alkyl group. M represents an Fe atom or a Cr atom. Or an Al atom, and X ⁺ represents a hydrogen ion, an alkali metal ion, an ammonium ion, an alkylammonium ion, or a mixed ion thereof.
It contains the compound represented by these, It is characterized by the above-mentioned.

The present inventors have found that the adsorption / desorption isotherm of the N ₂ molecule at a temperature of 77 K is useful for evaluating the aggregation state of the pyrazolone monoazo metal complex compound.

The adsorption / desorption isotherm of N ₂ molecule at a temperature of 77K is the adsorption isotherm in which the adsorption amount when the relative pressure of N ₂ molecule is increased, and the residual adsorption amount when the relative pressure is decreased. Is composed of desorption isotherms. The adsorption / desorption isotherm may take a so-called hysteresis structure in which the N ₂ molecule adsorption amount in the desorption process is higher than the N ₂ molecule adsorption amount in the adsorption process.

When the particles have an agglomerated state, the N ₂ molecules penetrate deeply into the agglomerated particles and adsorb in the adsorption process, so that the N ₂ molecules cannot be completely desorbed even when the relative pressure is reduced in the desorption process. It won't close. This phenomenon is called low pressure hysteresis.

  In other words, if it has a low-pressure hysteresis structure, for example, if it is left in a high-humidity environment, moisture will penetrate deeply into the aggregated particles at the molecular level, and will not be detached even if it becomes a low-humidity environment. It is considered that the image density is easily lowered.

  Therefore, the present inventors examined the state of low-pressure hysteresis and the image characteristics after being left in a harsh environment for the pyrazolone monoazo metal complex compound.

As a result, the difference between the low-pressure hysteresis appears effective amount of adsorption M1 of adsorption process when the relative pressure p / p ₀ is 0.4 and (cm ³ / g), relative pressure p / p ₀ 0.4 The difference (M2−M1) from the remaining adsorption amount M2 (cm ³ / g) in the desorption process at that time was used. It was also found that if (M2-M1) is 0.4 cm ³ / g or less, preferably 0.3 cm ³ / g or less, the toner can maintain sufficient charging performance even after being left in a harsh environment.

In the adsorption amount measurement, if the pressure is maintained at a constant pressure, the equilibrium state (the number of adsorbed molecules and the number of desorbed molecules is the same) is reached, and the pressure at which this equilibrium state is reached is called the adsorption equilibrium pressure p. The ratio between p and saturated vapor pressure p ₀ is called relative pressure. The isotherm is obtained by measuring the adsorption equilibrium pressure and the adsorption amount while changing the pressure, and plotting the results of the relative pressure on the horizontal axis and the adsorption amount on the vertical axis. In the present invention, the adsorption amounts M1 and M2 when the relative pressure is 0.4 are defined.

Further, the pyrazolone monoazo metal complex compound to obtain a uniform dispersion in the toner, the adsorption amount M1 of the adsorption process 3.0 cm ³ / g or more 8.0 cm ³ / g or less, preferably 4.0 cm ³ / g It is preferably 6.0 cm ³ / g or less.

  In the present invention, the pyrazolone monoazo metal complex compound represented by the formula [1] can be produced by using a known method for producing a monoazo complex compound. A typical production method is described below. First, a mineral acid such as hydrochloric acid or sulfuric acid is added to a diazo component such as 4-chloro-2-aminophenol, and when the liquid temperature becomes 5 ° C. or lower, sodium nitrite dissolved in water is added at a liquid temperature of 10 ° C. It is dropped while maintaining the following. 4-Chloro-2-aminophenol is diazotized by reacting with stirring at 10 ° C. or lower for 30 minutes to 3 hours. Add sulfamic acid, and confirm that nitrous acid does not remain excessively with potassium iodide starch paper.

  Next, a coupling component which is 3-methyl-1- (3,4-dichlorophenyl) -5-pyrazolone, an aqueous solution of sodium hydroxide, sodium carbonate and an organic solvent are added and dissolved by stirring at room temperature. The diazo compound is added thereto and stirred at room temperature for several hours to perform coupling. After stirring, it is confirmed that there is no reaction between the diazo compound and resorcin, and the reaction is completed. Stir well after adding water, let stand and separate. Further, an aqueous sodium hydroxide solution is added, washed with stirring, and liquid separation is performed. Thereby, a solution of the monoazo compound is obtained.

  As the organic solvent used in the above coupling, monohydric alcohols, dihydric alcohols, and ketone organic solvents are preferable. As monovalent alcohol, methanol, ethanol, n-propanol, 2-propanol, n-butanol, isobutyl alcohol, sec-butyl alcohol, n-amyl alcohol, isoamyl alcohol, ethylene glycol monoalkyl (1 to 4 carbon atoms) Ether. Examples of the divalent alcohol include ethylene glycol and propylene glycol. Examples of ketones include methyl ethyl ketone and methyl isobutyl ketone.

  Next, a metallization reaction is performed. Water, salicylic acid, n-butanol, and sodium carbonate are added to the monoazo compound solution and stirred. When iron is used as the coordination metal, an aqueous ferric chloride solution and sodium carbonate are added.

  The liquid temperature is raised to 30 ° C. to 40 ° C., and the reaction is followed by TLC (thin layer chromatography). After the elapse of 5 to 10 hours, it is confirmed that the raw material spots have disappeared, and the reaction is completed. After stopping stirring, stop and separate the liquid. Further, water, n-butanol, and aqueous sodium hydroxide solution are added to perform alkali cleaning. Remove the cake by filtration and wash with water.

  Further, in order to obtain a pyrazolone monoazo metal complex compound having no low-pressure hysteresis, which is the object of the present invention, the cake washed with water is dissolved in an organic solvent. The organic solvent used at this time is preferably dimethyl sulfoxide, N, N-dimethylformamide, monohydric alcohol, or dihydric alcohol. As monovalent alcohol, methanol, ethanol, n-propanol, 2-propanol, n-butanol, isobutyl alcohol, sec-butyl alcohol, n-amyl alcohol, isoamyl alcohol, ethylene glycol monoalkyl (1 to 4 carbon atoms) Ether. Examples of the divalent alcohol include ethylene glycol and propylene glycol.

  The solution is heated to 50 ° C., and water is added while stirring to gradually precipitate the charge control agent. If an antifoaming agent is added to water beforehand, the charge control agent can be made uniform by removing bubbles generated in the system. As a result, since the dispersion of the charge control agent in the toner is improved, the effects of the present invention can be easily obtained. After cooling and filtering, the pyrazolone monoazo metal complex compound of the present invention can be obtained by washing the cake with water and further vacuum drying the cake.

  Examples of a method for incorporating a monoazo metal complex compound, which is a charge control agent used in the present invention, into a toner include the following. A method of adding a kneading agent to a binder resin together with a colorant, kneading and pulverizing (pulverized toner), or a method of adding a monoazo metal complex compound to a polymerizable monomer monomer and polymerizing it to obtain a toner (polymerized toner) As described above, a method of adding (internal addition) to the inside of toner particles in advance;

In the present invention, the adsorption / desorption isotherm of the N ₂ molecule at a temperature of 77 K of the charge control agent is obtained by a gas adsorption method in which nitrogen gas is adsorbed on the sample surface using a pore distribution measuring device Tristar 3000 (manufactured by Shimadzu Corporation). It is measured. The outline of the measurement is described in the operation manual issued by Shimadzu Corporation and is as follows. Prior to the measurement, 0.3 to 0.5 g of the sample is put in a sample tube and evacuated for 24 hours at 23 ° C. After evacuation, the sample mass was precisely weighed to obtain a sample. The obtained sample was subjected to adsorption / desorption isotherm of N ₂ molecule at a temperature of 77K using the pore distribution measuring apparatus. The resulting, from adsorption and desorption isotherms, adsorption amount M1 of the adsorption process when the relative pressure p / p ₀ is 0.4, which is the ratio of the adsorption equilibrium pressure p versus a saturated vapor pressure p ₀ (cm ³ / g) And the difference (M2−M1) between the adsorption amount M2 (cm ³ / g) in the desorption process when the relative pressure p / p ₀ is 0.4.

The specific surface area of the charge control agent of the present invention, 9.0 m ² / g or more 23.0m ² / g or less, preferably at most 12.0m ² / g or more 18.0m ² / g. Controlling the specific surface area of the charge control agent within the above range is preferable because the charge distribution becomes sharp and the fog level on the non-image area becomes good even after being left in a harsh environment. The specific surface area of the charge control agent is calculated by measuring the adsorption / desorption isotherm of the N ₂ molecule.

  In addition, the charge control agent used in the present invention is preferably a monoazo iron complex compound represented by the following formula [2].

（式中、Ａ₁、Ａ₂及びＡ₃は、相互に独立して、水素原子、ニトロ基又はハロゲン原子を示す。Ｂ₁は水素原子又はアルキル基を示す。Ｊ⁺は、水素イオン、アルカリ金属イオン、アンモニウムイオン、アルキルアンモニウムイオン又はこれらの混合イオンを示す。）

(In the formula, A ₁ , A ₂ and A ₃ each independently represent a hydrogen atom, a nitro group or a halogen atom. B ₁ represents a hydrogen atom or an alkyl group. J ⁺ represents a hydrogen ion, an alkali. (A metal ion, an ammonium ion, an alkylammonium ion, or a mixed ion thereof.)

  That is, the coordination metal is preferably iron. By using iron as the coordination metal, the toner can be provided with stable charging performance over a long period of time.

  The charge control agent used in the present invention is more preferably a monoazo iron complex compound represented by the following formula [3].

（式中、Ｊ⁺は、水素イオン、アルカリ金属イオン、アンモニウムイオン、アルキルアンモニウムイオン又はこれらの混合イオンを示す。）

(In the formula, J ⁺ represents a hydrogen ion, an alkali metal ion, an ammonium ion, an alkylammonium ion, or a mixed ion thereof.)

  By adopting the structure shown in Formula [3], more stable charging performance can be obtained.

  Further, toner particles using the pyrazolone monoazo metal complex compound of the present invention have a methanol concentration (when the transmittance is 50% when the wettability with respect to a methanol / water mixed solvent is measured by the transmittance of light having a wavelength of 780 nm. TA) is preferably 50% by volume or more and 70% by volume or less.

  Controlling the methanol wettability of the toner particles within the above range is preferable because the uniformity of charging is more easily maintained even after severe storage and sleeve ghosts are less likely to occur.

  In order to control the methanol wettability of the toner particles within the range of the present invention, it can be achieved, for example, by controlling the polarity of the binder resin for toner.

  The water / methanol wettability test uses a methanol drop permeability curve measured under the following conditions and procedure using a powder wettability tester WET-100P manufactured by Reska Co., Ltd.

  First, 50 ml of a methanol / water mixed solvent (methanol concentration 0%) is placed in a flask and the transmittance is measured. The transmittance is measured with the transmittance at this time being 100% and the state in which no light is transmitted at all being 0%. That is, the methanol mass% when the transmitted light intensity at the time of measurement is half the transmitted light intensity when the methanol / water mixed solvent (methanol concentration 0%) is transmitted is defined as the wettability of the present invention.

  The transmittance is measured as follows.

  A magnetic stirrer is placed in a beaker containing 50 ml of a methanol / water mixed solvent (methanol concentration 0%). Then, 0.1 g of toner or toner particles sieved with a mesh having a mesh size of 150 μm is precisely weighed and put into the flask. Next, stirring is started by a magnetic stirrer at a stirring speed of 300 rpm (5 rotations / second), and methanol is continuously added into the measurement sample liquid at a rate of 1.3 ml / min by a glass tube. The transmittance of light having a wavelength of 780 nm is measured, and a methanol dropping transmittance curve is prepared. In this case, methanol is used as a titration solvent because it is less affected by elution of dyes, pigments, charge control agents and the like contained in the toner, and the surface state of the toner can be observed more accurately.

  In this measurement, a glass beaker having a diameter of 5 cm was used as the beaker, and a magnetic stirrer having a spindle shape of 25 mm in length and a maximum diameter of 8 mm and coated with Teflon (registered trademark) was used. .

  Examples of the binder resin used in the toner of the present invention include the following. Vinyl resin, styrene resin, styrene copolymer resin, polyester resin, polyol resin, polyvinyl chloride resin, phenol resin, natural modified phenol resin, natural resin modified maleic acid resin, acrylic resin, methacrylic resin, polyvinyl acetate, Silicone resin, polyurethane resin, polyamide resin, furan resin, epoxy resin, xylene resin, polyvinyl butyral, terpene resin, coumarone indene resin, petroleum resin. Among these, styrene copolymer resins, polyester resins, hybrid resins in which a polyester resin and a vinyl resin are mixed, or partially reacted are used as resins preferably used.

  The following compounds are mentioned as a polyester-type monomer which comprises the polyester resin used for the binder resin concerning this invention, or the polyester-type unit of the said hybrid resin.

  The following are mentioned as an alcohol component. Ethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, diethylene glycol, triethylene glycol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol 2-ethyl-1,3-hexanediol, bisphenol A hydride, bisphenol derivatives represented by the following formula (I-1) and diols represented by the following formula (I-2).

  Examples of the acid component include the following. Benzene dicarboxylic acids such as phthalic acid, terephthalic acid, isophthalic acid, and phthalic anhydride, or anhydrides thereof; alkyl dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, azelaic acid, or anhydrides thereof; Succinic acid or anhydride thereof substituted with the following alkyl or alkenyl groups; unsaturated dicarboxylic acids such as fumaric acid, maleic acid, citraconic acid, itaconic acid or anhydrides thereof.

  The polyester resin or the polyester unit according to the present invention is preferably a polyester resin having a crosslinked structure of a trivalent or higher polyvalent carboxylic acid or anhydride thereof and / or a trivalent or higher polyhydric alcohol. Examples of the trivalent or higher polyvalent carboxylic acid or anhydride thereof include the following. 1,2,4-benzenetricarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid, 1,2,4-naphthalenetricarboxylic acid, pyromellitic acid and acid anhydrides or lower alkyl esters thereof. Examples of the trihydric or higher polyhydric alcohol include the following. 1,2,3-propanetriol, trimethylolpropane, hexanetriol, pentaerythritol. In the binder resin of the present invention, an aromatic alcohol having high stability due to environmental fluctuation is particularly preferable, and examples thereof include 1,2,4-benzenetricarboxylic acid and anhydrides thereof.

  Examples of the vinyl monomer constituting the vinyl polymer unit of the vinyl resin or hybrid resin used in the binder resin according to the present invention include the following compounds.

  Styrene; o-methylstyrene, m-methylstyrene, p-methylstyrene, p-methoxystyrene, p-phenylstyrene, p-chlorostyrene, 3,4-dichlorostyrene, p-ethylstyrene, 2,4-dimethyl Styrene, pn-butyl styrene, p-tert-butyl styrene, pn-hexyl styrene, pn-octyl styrene, pn-nonyl styrene, pn-decyl styrene, pn-dodecyl styrene Styrene and its derivatives such as: styrene unsaturated monoolefins such as ethylene, propylene, butylene and isobutylene; unsaturated polyenes such as butadiene and isoprene; halogenated such as vinyl chloride, vinylidene chloride, vinyl bromide and vinyl fluoride Vinyls: Vinyl acetate, vinyl propionate, vinyl benzoate Vinyl esters such as: methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, n-octyl methacrylate, dodecyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, methacrylic acid Α-methylene aliphatic monocarboxylic acid esters such as phenyl, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate; methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, propyl acrylate, n-acrylate Acrylic esters such as octyl, dodecyl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, 2-chloroethyl acrylate, phenyl acrylate; vinyl methyl ether Vinyl ethers such as vinyl ethyl ether and vinyl isobutyl ether; vinyl ketones such as vinyl methyl ketone, vinyl hexyl ketone and methyl isopropenyl ketone; N-vinyl pyrrole, N-vinyl carbazole, N-vinyl indole, N-vinyl pyrrolidone N-vinyl compounds such as these; vinyl naphthalenes; acrylic acid or methacrylic acid derivatives such as acrylonitrile, methacrylonitrile and acrylamide.

  Furthermore, the following are mentioned. Unsaturated dibasic acids such as maleic acid, citraconic acid, itaconic acid, alkenyl succinic acid, fumaric acid, mesaconic acid; unsaturated such as maleic acid anhydride, citraconic acid anhydride, itaconic acid anhydride, alkenyl succinic acid anhydride Dibasic acid anhydride: maleic acid methyl half ester, maleic acid ethyl half ester, maleic acid butyl half ester, citraconic acid methyl half ester, citraconic acid ethyl half ester, citraconic acid butyl half ester, itaconic acid methyl half ester, alkenyl succinic acid Half-esters of unsaturated dibasic acids such as acid methyl half ester, fumaric acid methyl half ester and mesaconic acid methyl half ester; Unsaturated dibasic acid esters such as dimethylmaleic acid and dimethylfumaric acid; Acrylic acid, Methacrylic acid Α, β-unsaturated acids such as crotonic acid and cinnamic acid; α, β-unsaturated acid anhydrides such as crotonic acid anhydride and cinnamic anhydride, and anhydrides of the α, β-unsaturated acid and lower fatty acids A monomer having a carboxyl group such as alkenylmalonic acid, alkenylglutaric acid, alkenyladipic acid, acid anhydrides and monoesters thereof.

  Further, acrylic acid or methacrylic acid esters such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate; 4- (1-hydroxy-1-methylbutyl) styrene, 4- (1-hydroxy-1 -Methylhexyl) Monomers having a hydroxy group such as styrene.

  In the toner of the present invention, the vinyl resin or vinyl polymer unit used for the binder resin may have a crosslinked structure crosslinked with a crosslinking agent having two or more vinyl groups. The following are mentioned as a crosslinking agent used in this case. Aromatic divinyl compounds (divinylbenzene, divinylnaphthalene); diacrylate compounds linked by alkyl chains (ethylene glycol diacrylate, 1,3-butylene glycol diacrylate, 1,4-butanediol diacrylate, 1,5- Pentanediol acrylate, 1,6-hexanediol diacrylate, neopentylglycol diacrylate, and acrylates of the above compounds replaced with methacrylate); diacrylate compounds linked by an alkyl chain containing an ether bond (for example, , Diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, polyethylene glycol # 400 diacrylate, polyethylene glycol # 600 , Dipropylene glycol diacrylate, and acrylates of the above compounds replaced with methacrylate); diacrylate compounds entrapped with chains containing aromatic groups and ether bonds [polyoxyethylene (2) -2 , 2-bis (4hydroxyphenyl) propane diacrylate, polyoxyethylene (4) -2,2-bis (4hydroxyphenyl) propane diacrylate, and acrylates of the above compounds replaced with methacrylate]; polyester type Diacrylate compounds (“MANDA” manufactured by Nippon Kayaku Co., Ltd.).

  The following are mentioned as a polyfunctional crosslinking agent. Pentaerythritol triacrylate, trimethylol ethane triacrylate, trimethylol propane triacrylate, tetramethylol methane tetraacrylate, oligoester acrylate, and acrylates of the above compounds replaced with methacrylate; triallyl cyanurate, triallyl trimellitate .

  These crosslinking agents can be used in an amount of 0.01 to 10.00 parts by mass, and more preferably 0.03 to 5.00 parts by mass with respect to 100 parts by mass of other monomer components.

  Among these cross-linking agents, those which are preferably used in the binder resin from the viewpoint of fixability and offset resistance, are bonded with an aromatic divinyl compound (particularly divinylbenzene), a chain containing an aromatic group and an ether bond. Diacrylate compounds are mentioned.

  The following are mentioned as a polymerization initiator used for superposition | polymerization of the said vinyl-type resin or a vinyl-type polymer unit. 2,2′-azobisisobutyronitrile, 2,2′-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2, 2'-azobis (2-methylbutyronitrile), dimethyl-2,2'-azobisisobutyrate, 1,1'-azobis (1-cyclohexanecarbonitrile), 2- (carbamoylazo) -isobutyronitrile 2,2′-azobis (2,4,4-trimethylpentane), 2-phenylazo-2,4-dimethyl-4-methoxyvaleronitrile, 2,2-azobis (2-methylpropane), methyl ethyl ketone peroxide, Ketone peroxides such as acetylacetone peroxide, cyclohexanone peroxide, 2,2-bis (tert-butyl) Peroxy) butane, tert-butyl hydroperoxide, cumene hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, di-tert-butyl peroxide, tert-butylcumyl peroxide, dicumyl peroxide , Α, α'-bis (tert-butylperoxyisopropyl) benzene, isobutyl peroxide, octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, 3,5,5-trimethylhexanoyl peroxide, benzoyl peroxide M-trioyl peroxide, di-isopropyl peroxydicarbonate, di-2-ethylhexyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di-2-e Xylethylperoxycarbonate, dimethoxyisopropylperoxydicarbonate, di (3-methyl-3-methoxybutyl) peroxycarbonate, acetylcyclohexylsulfonyl peroxide, tert-butylperoxyacetate, tert-butylperoxyisobutyrate, tert-butyl peroxyneodecanoate, tert-butyl peroxy 2-ethylhexanoate, tert-butyl peroxylaurate, tert-butyl peroxybenzoate, tert-butyl peroxyisopropyl carbonate, di-tert-butyl Peroxyisophthalate, tert-butyl peroxyallyl carbonate, tert-amyl peroxy 2-ethylhexanoate, di-tert-butyl perper Carboxymethyl hexahydro terephthalate, di -tert- butyl peroxy azelate.

  In the present invention, when the above-described hybrid resin is used as the binder resin, it is preferable that a monomer component capable of reacting with both resin components is contained in the vinyl resin and / or the polyester resin component. Examples of monomers that can react with the vinyl resin among the monomers constituting the polyester resin component include unsaturated dicarboxylic acids such as fumaric acid, maleic acid, citraconic acid, and itaconic acid, or anhydrides thereof. Among the monomers constituting the vinyl resin component, those capable of reacting with the polyester resin component include those having a carboxyl group or a hydroxy group, and acrylic acid or methacrylic acid esters.

  As a method for obtaining a reaction product of a vinyl resin and a polyester resin, a polymer containing a monomer component capable of reacting with each of the vinyl resin and the polyester resin listed above is present. A method obtained by polymerizing a resin is preferred.

  Moreover, although the above binder resins may be used alone, two kinds of high softening point resins (H) and low softening point resins (L) having different softening points may be mixed in an arbitrary range. May be used. The high softening point resin (H) preferably has a softening point of 120 ° C. or higher and 170 ° C. or lower. The low softening point resin (L) preferably has a softening point of 70 ° C. or higher and lower than 120 ° C.

  Such a system is preferable because the molecular weight distribution of the toner can be designed relatively easily and a wide fixing region can be provided. In particular, from the viewpoint of the balance between low-temperature fixability, developability, and material dispersibility, the high softening point resin (H) is preferably a hybrid resin, and the low softening point resin (L) is preferably a polyester resin.

  When one kind of binder resin is used alone, the softening point Tm is preferably 95 ° C. or higher and 170 ° C. or lower. More preferably, it is 120 degreeC or more and 160 degrees C or less. If Tm is within the above range, the balance between high temperature offset resistance and low temperature fixability is good.

  The softening point is measured as follows. The softening point of the resin is measured by using a constant load extrusion type capillary rheometer “flow characteristic evaluation device Flow Tester CFT-500D” (manufactured by Shimadzu Corporation) according to the manual attached to the device. In this device, while applying a constant load from the top of the measurement sample with the piston, the measurement sample filled in the cylinder is heated and melted, and the melted measurement sample is pushed out from the die at the bottom of the cylinder, and the piston drop amount at this time A flow curve showing the relationship between temperature and temperature can be obtained.

  In the present invention, the “melting temperature in the 1/2 method” described in the manual attached to the “flow characteristic evaluation apparatus Flow Tester CFT-500D” is the softening point. The melting temperature in the 1/2 method is calculated as follows. First, ½ of the difference between the piston lowering amount Smax at the time when the outflow ends and the piston lowering amount Smin at the time when the outflow starts is obtained (this is X. X = (Smax−Smin) / 2). And the temperature of the flow curve when the amount of piston descent in the flow curve is the sum of X and Smin is the melting temperature Tm in the 1/2 method.

  As a measurement sample, about 1.0 g of a sample is compression-molded at about 10 MPa using a tablet molding compressor (for example, NT-100H, manufactured by NPA System) in an environment of 25 ° C. for about 60 seconds. A cylindrical shape having a diameter of about 8 mm is used.

The measurement conditions of CFT-500D are as follows.
Test mode: Temperature rising start temperature: 50 ° C
Achieving temperature: 200 ° C
Measurement interval: 1.0 ° C
Temperature increase rate: 4.0 ° C./min
Piston cross-sectional area: 1.000 cm ²
Test load (piston load): 10.0 kgf (0.9807 MPa)
Preheating time: 300 seconds Die hole diameter: 1.0 mm
Die length: 1.0mm

  The glass transition temperature (Tg) of the binder resin is preferably 45 ° C. or higher from the viewpoint of storage stability. Further, from the viewpoint of low-temperature fixability, Tg is preferably 75 ° C. or less, and particularly preferably 65 ° C. or less.

  The glass transition temperature (Tg) of the binder resin for toner is measured under normal temperature and humidity according to ASTM D3418-82 using a differential scanning calorimeter (DSC) and MDSC-2920 (manufactured by TA Instruments). To do. As a measurement sample, a precisely weighed about 3 mg of binder resin is used. This is put in an aluminum pan and an empty aluminum pan is used as a reference. The measurement temperature range is 30 ° C. or more and 200 ° C. or less, once the temperature is increased from 30 ° C. to 200 ° C. at a temperature increase rate of 10 ° C./min, then the temperature is decreased from 200 ° C. to 30 ° C. at a temperature decrease rate of 10 ° C./min. The temperature is raised to 200 ° C. at a temperature rising rate of 10 ° C./min. In the DSC curve obtained in the second temperature raising process, the intersection point between the baseline intermediate line before and after the specific heat change and the differential heat curve is defined as the glass transition temperature Tg of the resin.

  The toner of the present invention can be used as any one of magnetic one-component toner, non-magnetic one-component toner, and non-magnetic two-component toner.

  When used as a magnetic one-component toner, magnetic iron oxide particles are preferably used as the colorant. Magnetic iron oxide particles contained in the magnetic one-component toner include magnetic iron oxides such as magnetite, maghemite and ferrite, and magnetic iron oxides including other metal oxides; metals such as Fe, Co and Ni, or these Of Al, Co, Cu, Pb, Mg, Ni, Sn, Zn, Sb, Be, Bi, Cd, Ca, Mn, Se, Ti, W, V, and mixtures thereof Is mentioned.

  Examples of the colorant when used as the nonmagnetic one-component toner and the nonmagnetic two-component toner include the following.

  As the black pigment, carbon black such as furnace black, channel black, acetylene black, thermal black and lamp black is used, and magnetic powder such as magnetite and ferrite is also used.

  As a colorant suitable for the yellow color, a pigment or a dye can be used. Examples of the pigment include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 23, 62, 65, 73, 74, 81, 83, 93, 94, 95, 97, 98, 109, 110, 111, 117, 120, 127, 128, 129, 137, 138, 139, 147, 151, 154, 155, 167, 168, 173, 174, 176, 180, 181, 183, 191, C.I. I. Butt yellow 1,3,20 is mentioned. Examples of the dye include C.I. I. Solvent yellow 19, 44, 77, 79, 81, 82, 93, 98, 103, 104, 112, 162 etc. are mentioned. These are used alone or in combination of two or more.

  As a colorant suitable for cyan, a pigment or a dye can be used. Examples of the pigment include C.I. I. Pigment Blue 1, 7, 15, 15; 1, 15; 2, 15; 3, 15; 4, 16, 17, 60, 62, 66, etc., C.I. I. Bat Blue 6, C.I. I. Acid Blue 45 is exemplified. Examples of the dye include C.I. I. Solvent Blue 25, 36, 60, 70, 93, 95 etc. are mentioned. These are used alone or in combination of two or more.

  As a colorant suitable for magenta, a pigment or a dye can be used. Examples of the pigment include C.I. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 30, 31, 32, 37, 38, 39, 40, 41, 48, 48; 2, 48; 3, 48; 4, 49, 50, 51, 52, 53, 54, 55, 57, 57; 1, 58, 60, 63, 64, 68, 81, 81; 1, 83, 87, 88, 89, 90, 112, 114, 122, 123, 144, 146, 150, 163, 166, 169, 177, 184, 185, 202, 206, 207, 209, 220, 221, 238, 254, etc., C.I. I. Pigment violet 19; C.I. I. Buttred 1, 2, 10, 13, 15, 23, 29, 35 may be mentioned. Examples of the magenta dye include C.I. I. Solvent Red 1, 3, 8, 23, 24, 25, 27, 30, 49, 52, 58, 63, 81, 82, 83, 84, 100, 109, 111, 121, 122, etc. I. Disper thread 9, C.I. I. Solvent Violet 8, 13, 14, 21, 27 etc., C.I. I. Oil-soluble dyes such as disperse violet 1, C.I. I. Basic Red 1, 2, 9, 12, 13, 14, 15, 17, 18, 22, 23, 24, 27, 29, 32, 34, 35, 36, 37, 38, 39, 40, etc. I. Basic violet 1,3,7,10,14,15,21,25,26,27,28 etc. basic dyes etc. are mentioned. These are used alone or in combination of two or more.

  In order to impart releasability to the toner, the toner preferably contains a release agent (wax). As the wax, hydrocarbon waxes such as low molecular weight polyethylene, low molecular weight polypropylene, microcrystalline wax, and paraffin wax are preferably used because of easy dispersion in the toner and high releasability. If necessary, a small amount of one or two or more kinds of waxes may be used in combination. Examples include the following:

  Oxides of aliphatic hydrocarbon waxes such as oxidized polyethylene wax, or block copolymers thereof; waxes based on fatty acid esters such as carnauba wax, sazol wax, and montanate ester wax; deacidified carnauba Deoxidized part or all of fatty acid esters such as wax. Furthermore, the following are mentioned. Saturated linear fatty acids such as palmitic acid, stearic acid, and montanic acid; unsaturated fatty acids such as pracidic acid, eleostearic acid, and parinalic acid; stearyl alcohol, aralkyl alcohol, behenyl alcohol, carnauvyl alcohol, seryl alcohol, Saturated alcohols such as sil alcohols; long-chain alkyl alcohols; polyhydric alcohols such as sorbitol; fatty acid amides such as linoleic acid amide, oleic acid amide, lauric acid amide; methylene bis stearic acid amide, ethylene biscapric acid amide Saturated fatty acid bisamides such as ethylene bislauric acid amide and hexamethylene bis stearic acid amide; ethylene bisoleic acid amide, hexamethylene bisoleic acid amide, N, N′-dioleyl adipine Amides, unsaturated fatty acid amides such as N, N-dioleyl sebacic acid amide; m-xylene bisstearic acid amide, aromatic bisamides such as N, N-distearylisophthalic acid amide; calcium stearate, calcium laurate, Fatty acid metal salts such as zinc stearate and magnesium stearate (generally called metal soap); waxes grafted with aliphatic hydrocarbon waxes using vinyl monomers such as styrene and acrylic acid; behenine A partially esterified product of a fatty acid such as an acid monoglyceride and a polyhydric alcohol; a methyl ester compound having a hydroxyl group obtained by hydrogenation of a vegetable oil.

  Examples of waxes that are particularly preferably used in the present invention include aliphatic hydrocarbon waxes. Examples of such aliphatic hydrocarbon waxes include the following. Low molecular weight alkylene polymer obtained by radical polymerization of alkylene under high pressure or Ziegler catalyst under low pressure; alkylene polymer obtained by thermally decomposing high molecular weight alkylene polymer; synthesis containing carbon monoxide and hydrogen Synthetic hydrocarbon waxes obtained from the distillation residue of hydrocarbons obtained from the gas by the age method and synthetic hydrocarbon waxes obtained by hydrogenating them; press sweating method, solvent method, vacuum Wax separated by use of distillation or fractional crystallization.

  Examples of the hydrocarbon as the base of the aliphatic hydrocarbon wax include the following. Carbonization synthesized by the reaction of carbon monoxide and hydrogen using a metal oxide catalyst (often a multi-component system of two or more types) (for example, the Gintor method, Hydrocol method (using a fluidized catalyst bed)) Hydrogen compounds); hydrocarbons having up to about several hundred carbon atoms obtained by the age method (using an identified catalyst bed) in which a large amount of waxy hydrocarbons can be obtained; hydrocarbons obtained by polymerizing alkylene such as ethylene with a Ziegler catalyst. Specific examples include the following. Biscol (registered trademark) 330-P, 550-P, 660-P, TS-200 (Sanyo Chemical Industry Co., Ltd.); High Wax 400P, 200P, 100P, 410P, 420P, 320P, 220P, 210P, 110P (Mitsui Chemicals) Sazol H1, H2, C80, C105, C77 (Sazol Corporation); HNP-1, HNP-3, HNP-9, HNP-10, HNP-11, HNP-12 (Nippon Seiwa Co., Ltd.), Unilin (registered trademark) 350, 425, 550, 700, Unicid (registered trademark) 350, 425, 550, 700 (Toyo Petrolite); wood wax, beeswax, rice wax, candelilla wax, carnauba wax (Co., Ltd.) Celerica NODA).

  When the toner is prepared by a pulverization method, the release agent may be added at the time of melt-kneading or may be at the time of production of a toner resin. These release agents may be used alone or in combination. The release agent is preferably added in an amount of 1 to 20 parts by mass with respect to 100 parts by mass of the binder resin.

  The toner of the present invention can be used as a charge control agent in combination with other known charge control agents in addition to the monoazo metal complex compound. Other charge control agents include azo iron complexes or complex salts, azo chromium complexes or complex salts, azo manganese complexes or complex salts, azo cobalt complexes or complex salts, azo zirconium complexes or complex salts, carboxylic acid derivative chromium complexes or Examples include complex salts, zinc complexes or complex salts of carboxylic acid derivatives, aluminum complexes or complex salts of carboxylic acid derivatives, and zirconium complexes or complex salts of carboxylic acid derivatives. The carboxylic acid derivative is preferably an aromatic hydroxycarboxylic acid. A charge control resin can also be used. When the charge control agent used in the present invention is used in combination with another charge control agent, the other charge control agent is preferably used in an amount of 0.1 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the toner resin. .

  The toner of the present invention may be mixed with a carrier and used as a two-component developer. As the carrier, a normal carrier such as ferrite or magnetite or a resin-coated carrier can be used. A binder type carrier core in which magnetic powder is dispersed in a resin can also be used.

  The resin-coated carrier is composed of carrier core particles and a coating material that is a resin that coats (coats) the surface of the carrier core particles. Examples of the resin used for the coating material include styrene-acrylic resins such as styrene-acrylic acid ester copolymers and styrene-methacrylic acid ester copolymers; acrylic resins such as acrylic acid ester copolymers and methacrylic acid ester copolymers. Fluorine-containing resins such as polytetrafluoroethylene, monochlorotrifluoroethylene polymer and polyvinylidene fluoride; silicone resins; polyester resins; polyamide resins; polyvinyl butyral; aminoacrylate resins. Other examples include ionomer resins and polyphenylene sulfide resins. These resins can be used alone or in combination.

In the toner of the present invention, silica fine powder is preferably externally added to the toner particles in order to improve charging stability, developability, fluidity, and durability. The silica fine powder preferably has a specific surface area of 30 m ² / g or more, more preferably 50 m ² / g or more and 400 m ² / g or less by the BET method by nitrogen adsorption. The silica fine powder is preferably used in an amount of 0.01 to 8.00 parts by mass, and more preferably 0.10 to 5.00 parts by mass with respect to 100 parts by mass of the toner particles. The BET specific surface area of the fine silica powder is determined by using, for example, a specific surface area measuring device Autosorb 1 (manufactured by Yuasa Ionics), GEMINI 2360/2375 (manufactured by Micrometric), Tristar 3000 (manufactured by Micrometric). Nitrogen gas is adsorbed on the surface of the powder, and calculation can be performed using the BET multipoint method.

  Silica fine powder has unmodified silicone varnish, various modified silicone varnishes, unmodified silicone oil, various modified silicone oils, silane coupling agents, and functional groups for the purpose of hydrophobization and triboelectric charge control as required. It is also preferable that it is treated with a treating agent such as a silane compound or other organosilicon compound or in combination with various treating agents.

  Furthermore, you may add another external additive to the toner of this invention as needed. Examples of such external additives include charging aids, conductivity-imparting agents, fluidity-imparting agents, anti-caking agents, release agents at the time of heat roller fixing, lubricants, abrasives, etc. An inorganic fine powder is mentioned. Examples of the lubricant include polyfluorinated ethylene powder, zinc stearate powder, and polyvinylidene fluoride powder. Examples of the abrasive include cerium oxide powder, silicon carbide powder, and strontium titanate powder. Of these, strontium titanate powder is preferable.

  As a method for producing the toner, the following method can be used. A binder resin, a colorant, a charge control agent, and if necessary, a wax, other additives, and the like are sufficiently mixed by a mixer such as a Henschel mixer or a ball mill. The mixture is melt-kneaded using a heat kneader such as a twin-screw kneading extruder, heating roll, kneader, or extruder. At that time, wax, magnetic iron oxide particles, and a metal-containing compound may be added. The melt-kneaded product is cooled and solidified, and then pulverized and classified to obtain toner particles. Further, if necessary, the toner particles and external additives can be mixed with a mixer such as a Henschel mixer to obtain a toner.

  The following are mentioned as a mixer. Henschel mixer (made by Mitsui Mining); Super mixer (made by Kawata); Ribocorn (made by Okawara Seisakusho); Nauta mixer, turbulizer, cyclomix (made by Hosokawa Micron); A Ladige mixer (manufactured by Matsubo). Examples of the kneader include the following. KRC Kneader (manufactured by Kurimoto Iron Works); Bus Co Kneader (manufactured by Buss); TEM type extruder (manufactured by Toshiba Machine); TEX twin-screw kneader (manufactured by Nippon Steel Works); Steel mill); three roll mill, mixing roll mill, kneader (manufactured by Inoue Seisakusho); kneedex (manufactured by Mitsui Mining); MS-type pressure kneader, nider ruder (manufactured by Moriyama Seisakusho); Banbury mixer (Kobe Steel) (Made by the company). Examples of the pulverizer include the following. Counter jet mill, micron jet, inomizer (manufactured by Hosokawa Micron); IDS type mill, PJM jet crusher (manufactured by Nippon Pneumatic Industrial Co., Ltd.); cross jet mill (manufactured by Kurimoto Iron Works Co., Ltd.); SK; jet mill (manufactured by Seishin Enterprise Co., Ltd.); kryptron (manufactured by Kawasaki Heavy Industries, Ltd.); turbo mill (manufactured by Turboe Corporation); super rotor (manufactured by Nisshin Engineering Co., Ltd.).

  Examples of the classifier include the following. Classifier, Micron Classifier, Spedic Classifier (manufactured by Seishin Enterprise); Turbo Classifier (manufactured by Nissin Engineering); Micron Separator, Turboplex (ATP), TSP Separator (manufactured by Hosokawa Micron); Elbow Jet (Japan) Iron Mining Co., Ltd.), Dispersion Separator (manufactured by Nippon Pneumatic Engineering Co., Ltd.); YM Microcut (manufactured by Yaskawa Corporation).

  Examples of the sieving apparatus used for sieving coarse particles include the following. Ultrasonic (manufactured by Sakae Sangyo Co., Ltd.); Resonator Sheave, Gyroshifter (Tokusu Kosakusha Co., Ltd.); Vibrasonic System (manufactured by Dalton Co.); Micro shifter (manufactured by Hadano Sangyo Co., Ltd.); circular vibrating sieve.

  Hereinafter, the present invention will be specifically described with reference to examples. The “parts” in the examples represent parts by mass unless otherwise specified.

<Example of production of binder resin for toner (A-1)>
・ Terephthalic acid: 24 mol%
-Dodecenyl succinic acid: 16 mol%
-Trimellitic acid: 7 mol%
-Bisphenol derivative represented by the following formula (I-1): 31 mol%
(Propylene oxide 2.5 mol adduct)
-Bisphenol derivative represented by the following formula (I-1): 22 mol%
(Ethylene oxide 2.5 mol adduct)

Tetrabutoxy titanate as a raw material and a catalyst were charged into a four-necked flask and equipped with a decompression device, a water separation device, a nitrogen gas introduction device, a temperature measurement device, and a stirring device. Then, 25 parts of a monomer for producing a styrene-acrylic resin unit shown below was added to 100 parts of the raw material while stirring at a temperature of 130 ° C. in a nitrogen atmosphere. At that time, the following monomers were mixed with a polymerization initiator (benzoyl peroxide) and dropped from the dropping funnel over 4 hours.
・ Styrene: 82% by mass
2-ethylhexyl acrylate: 16% by mass
-Acrylic acid: 2% by mass

  This was aged for 3 hours while maintaining the temperature at 130 ° C., and the reaction was carried out by raising the temperature to 230 ° C. After completion of the reaction, the product was taken out of the container and pulverized to obtain a toner binder resin (A-1). The binder resin for toner (A-1) contains a polyester resin component, a vinyl polymer component, and a hybrid resin component in which a polyester unit and a styrene-acrylic resin unit are chemically bonded, and has a softening point. The glass transition point Tg was 131 ° C. and 65 ° C.

<Example of production of binder resin for toner (A-2)>
・ Terephthalic acid: 50.0 mol%
・ Ethylene glycol: 35.0 mol%
・ Neopentyl glycol: 15.0 mol%
The above monomer was charged into a reaction vessel equipped with a cooling tube, a stirrer and a nitrogen introduction tube, and tetrabutoxy titanate was added as a polymerization catalyst. Heat to 210 ° C., react for 5 hours while distilling off the water generated under a nitrogen stream, react for 1 hour under reduced pressure of 5 mmHg to 20 mmHg, and then react under reduced pressure of 20 mmHg to 40 mmHg. And taken out at a predetermined softening point. The obtained resin was cooled to room temperature and then pulverized into particles to obtain a binder resin for toner (A-2). The obtained binder resin for toner (A-2) had a softening point of 112 ° C. and a glass transition point Tg of 55 ° C.

<Example of production of binder resin for toner (A-3)>
In the production example of the binder resin for toner (A-2), the monomer of the binder resin for toner was changed as follows. Otherwise, the toner binder resin (A-3) was obtained in the same manner as in the production example of the toner binder resin (A-2).
・ Terephthalic acid: 12.0 mol%
・ Fumaric acid: 35.0 mol%
・ Ethylene glycol: 44.5 mol%
・ Neopentyl glycol: 6.0 mol%

  The obtained binder resin for toner (A-3) had a softening point of 128 ° C. and a glass transition point Tg of 54 ° C.

<Example of production of binder resin for toner (A-4)>
In the production example of the binder resin for toner (A-2), the monomer of the binder resin for toner was changed as follows. Otherwise, the toner binder resin (A-4) was obtained in the same manner as in the production example of the toner binder resin (A-2).
・ Terephthalic acid: 45.0 mol%
・ Fumaric acid: 2.0 mol%
・ Ethylene glycol: 33.0 mol%
・ Neopentyl glycol: 17.5 mol%

  The obtained binder resin for toner (A-4) had a softening point of 135 ° C. and a glass transition point Tg of 59 ° C.

<Example of production of binder resin for toner (A-5)>
Into a four-necked flask, 300 parts of xylene is charged, and the inside of the container is sufficiently replaced with nitrogen while stirring, and then heated to reflux.

  Under this reflux, 4 parts of a mixture of 76.0 parts of styrene, 24.0 parts of acrylic acid-n-butyl and 2 parts of di-tert-butyl peroxide (initiator 1; half-life 10 hours temperature: 129 ° C.) After dropwise addition over time, the polymerization was completed by holding for 2 hours to obtain a low molecular weight polymer solution.

  Next, after putting 180 parts of degassed water and 20 parts of a 2% by weight aqueous solution of polyvinyl alcohol into a four-necked flask, 71.0 parts of styrene, 24.0 parts of acrylic acid-n-butyl, mono-n-maleic acid Butyl 5.0 parts, divinylbenzene 0.005 parts and 2,2-bis (4,4-di-tert-butylperoxycyclohexyl) propane (initiator 2; half-life 10 hours temperature: 92 ° C.) 0.1 Part of the mixture was added and stirred to give a suspension.

  After sufficiently replacing the inside of the flask with nitrogen, the temperature was raised to 85 ° C. to initiate polymerization. After maintaining at the same temperature for 24 hours, 0.1 part of benzoyl peroxide (half-life 10 hours temperature: 72 ° C.) was added. Furthermore, the polymerization was completed by maintaining for 12 hours. Thereafter, the high molecular weight polymer was separated by filtration, washed with water and dried to obtain a high molecular weight component.

  In a four-necked flask, 200 parts of the low molecular weight component xylene solution (corresponding to 60 parts of the low molecular weight component) is added, and the temperature is raised and stirred under reflux. On the other hand, 200 parts of the high molecular weight component solution (corresponding to 40 parts of high molecular weight component) is put into another container and refluxed. After the low molecular weight component solution and the high molecular weight component solution were mixed under reflux, the organic solvent was distilled off, and the resulting resin was cooled, solidified and then pulverized to obtain a binder resin for toner (A-5). .

  The obtained binder resin for toner (A-5) had a softening point of 137 ° C. and a glass transition point Tg of 60 ° C.

<Charge control agents (B-1) to (B-10)>
As the charge control agents (B-1) to (B-10), those having the physical properties described in Table 1 were used.

The structures of the charge control agents (B-1) to (B-10) were identified from infrared absorption spectrum, visible absorption spectrum, elemental analysis (C, H, N), atomic absorption analysis, and mass spectrum. Was also confirmed to be a compound of formula [3]. In any charge control agent, the counter ion J ⁺ was a mixture containing hydrogen ions, sodium ions, and ammonium ions.

Further, as representative examples of the adsorption / desorption isotherm, the profiles of the adsorption / desorption isotherm of the N ₂ molecule at 77 K of the charge control agents (B-1) and (B-6) are shown in FIGS. Each is shown.

<Example 1>
Binder resin for toner (A-1): 70 parts Binder resin for toner (A-2): 30 parts Magnetic iron oxide particles: 50 parts (average particle size 0.20 μm, Hc = 11.5 kA / m, σs = 85 Am ² / kg, σr = 16 Am ² / kg)
Polyethylene wax (Sazol, C105, melting point 105 ° C.): 2 parts Charge control agent (B-1): 1 part After the above materials were premixed with a Henschel mixer, PCM-30 (Ikegai Iron Works) The temperature was set so that the melt temperature at the discharge port was 150 ° C., and melt kneading was performed. The obtained kneaded product was cooled, coarsely pulverized with a hammer mill, and then finely pulverized using a turbo mill T250 (manufactured by Turbo Kogyo Co., Ltd.). The finely pulverized powder thus obtained was classified using a multi-division classifier utilizing the Coanda effect to obtain toner particles having a weight average particle diameter (D4) of 6.8 μm.

  The obtained toner particles were subjected to a water / methanol wettability test, and the methanol concentration (TA) at a transmittance of 50% was measured. The results are shown in Table 2.

Next, 100 parts of toner particles are hydrophobized with hydrophobic silica fine powder (BET specific surface area of 150 m ² / g, 100 parts of silica fine powder with 30 parts of hexamethyldisilazane (HMDS) and 10 parts of dimethyl silicone oil. 1.0 part and 3.0 parts of strontium titanate fine powder (D50: 1.0 μm) were externally added and mixed, and sieved with a mesh having an opening of 150 μm to obtain toner (C-1). Part of the obtained toner (C-1) was left in a harsh environment (40 ° C., 95% RH) for 30 days. The following evaluation was performed on the samples before and after being left. Table 3 shows the evaluation results before leaving the harsh environment, and Table 4 shows the evaluation results after leaving the harsh environment.

<Development Evaluation (1)>
Using a commercially available digital copier imageRUNNER iR 3245 (manufactured by Canon Inc.), a test with a printing ratio of 5% in a low temperature and low humidity environment (10 ° C, 30% RH) and a high temperature and high humidity environment (35 ° C, 85% RH) 100,000 sheets were continuously printed using the chart. Then, the reduction rate of the image density after the end of 100,000 sheets with respect to the 100th sheet was calculated. The image density was measured by measuring the reflection density of a 5 mm round solid black image using an SPI filter with a Macbeth densitometer (Macbeth Co., Ltd.), which is a reflection densitometer. The evaluation criteria are shown below.
A (very good): The image density reduction rate is less than 3%.
B (good): The image density reduction rate is 3% or more and less than 6%.
C (Normal): The image density reduction rate is 6% or more and less than 10%.
D (Poor): The image density reduction rate is 10% or more.

<Evaluation of fog value>
In the evaluation of developability (1), Ds is the worst value of the reflection density of the white background of the initial 10th and 100,000th images, and Dr is the reflection average density of the transfer material before image formation. Value. A reflection densitometer (reflectometer model TC-6DS manufactured by Tokyo Denshoku Co., Ltd.) was used for measurement of the white background reflection density. The smaller the value, the better the fog suppression. The evaluation criteria are shown below.
A (very good): The fog value is less than 1.
B (good): The fog value is 1 or more and less than 3.
C (Normal): The fog value is 3 or more and less than 5.
D (bad): The fog value is 5 or more.

During evaluation in developability evaluation (1), sleeve ghost was also evaluated for every 10,000 printouts. As shown in FIG. 3, there was printed an image in which there was a block-shaped solid black image for one circumference of the developing sleeve, followed by a half-tone solid image. Then, how much the history of the image of the first developing sleeve appears in the halftone after the second developing sleeve was determined by visual evaluation of the image according to the following criteria.
A: No difference in shading is observed.
B: A slight shading difference is observed.
C: A difference in shading is noticeable.
D: A difference in shading is also observed after the third round of the sleeve.

(Vertical stripe evaluation of halftone images)
In the evaluation of developability (1), the halftone image after endurance of 100,000 sheets was visually evaluated to evaluate the occurrence of vertical streaks due to development.
A (very good) Vertical stripes are not seen at all B (good) If you look carefully, there are slight vertical stripes C (normal) There is slight unevenness due to vertical stripes, but there is no problem on the image D (slightly bad) Unevenness due to vertical stripes

  As for Example 1, good results were obtained in all cases.

<Examples 2 to 5>
Toners (C-2) to (C-8) were produced in the same manner as in Example 1 except that the formulations shown in Table 2 were used. The toner (C-5) uses a styrene-acrylic copolymer resin (manufactured by Mitsui Chemicals, product name: CPR-100 softening point: 111 ° C.) as the binder resin for toner (A-6). It was.

  Evaluation similar to Example 1 was implemented with respect to the obtained toner. The results are shown in Tables 3 and 4.

<Comparative Examples 1 to 5>
Toners (C-6) to (C-10) were produced in the same manner as in Example 1 except that the formulations shown in Table 2 were used. Evaluation similar to Example 1 was implemented with respect to the obtained toner. The results are shown in Tables 3 and 4.

Claims (3)

A toner having toner particles containing a charge control agent and a binder resin,
The charge control agent is an adsorption / desorption isotherm of N ₂ molecules at a temperature of 77K.
i) adsorption amount M1 of the adsorption process when the relative pressure p / p ₀ is 0.4, which is the ratio of the adsorption equilibrium pressure p for the saturated vapor pressure p ₀ is 3.0 cm ³ / g or more 8.0 cm ³ / g or less And
ii) The difference (M2−M1) between the adsorption amount M1 and the adsorption amount M2 (cm ³ / g) in the desorption process when the relative pressure p / p ₀ is 0.4 is 0.4 cm ³ / g or less. Yes,
The charge control agent has the following formula [1]

(In the formula, A ₁ , A ₂ and A ₃ each independently represent a hydrogen atom, a nitro group or a halogen atom. B ₁ represents a hydrogen atom or an alkyl group. M represents an Fe atom or a Cr atom. Or an Al atom, and X ⁺ represents a hydrogen ion, an alkali metal ion, an ammonium ion, an alkylammonium ion, or a mixed ion thereof.
A toner comprising a compound represented by the formula: The toner according to claim 1 having a specific surface area of the charge control agent is equal to or less than 9.0 m ² / g or more 23.0m ² / g.   When the wettability of the toner particles to the methanol / water mixed solvent is measured by the transmittance of light having a wavelength of 780 nm, the methanol concentration (TA) when the transmittance is 50% is 50% by volume or more and 70% by volume or less. The toner according to claim 1, wherein:

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