JP2003262987A - Negative chargeability control resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a negative chargeability control resin which is environmentally safe, which has favorable electrification property, dispersibility and coloring property and which can freely control charges. <P>SOLUTION: The negative chargeability control resin containing an acrylamide sulfonic acid or acrylamide sulfonate expressed by formula (1) as the structural unit, is characterized in that the water content is ≤1.6 mass% at 22°C and 55% humidity. In formula (1), R<SB>1</SB>, R<SB>2</SB>, R<SB>3</SB>and R<SB>4</SB>may be mutually the same or different groups and each represents hydrogen atom or an aliphatic group and X represents hydrogen atom or an alkali metal. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negatively chargeable control resin for a charged toner for electrophotography, which is used when a latent electrostatic latent image is made into a visible image in dry electrophotography, and more specifically, The present invention relates to a negative charge control resin for a charged toner for electrophotography, which can freely control charge, does not cause toner scattering when used as a charge control agent, has a clear hue and is excellent in image reproducibility, and can form a high density image. .

[0002]

2. Description of the Related Art Conventionally, various electrophotographic methods have been described in US Pat. No. 2,297,691, JP-B-42-23910 and JP-B-43-24748.

The developing methods applied to these electrophotographic methods and the like are roughly classified into a dry developing method and a wet developing method. The former is further divided into a method using a two-component developer and a method using a one-component developer.

As the toner applied to these dry developing methods, fine powder in which a dye or a pigment is dispersed in a natural or synthetic resin is conventionally used. For example, 1 to 30 μm of a colorant dispersed in a binder resin such as polystyrene
Particles finely pulverized to about m are used as toner. A magnetic toner containing magnetic particles such as magnetite is used. In the case of a two-component developer, the toner is usually used by mixing it with carrier particles such as iron powder and magnetic ferrite particles.

The toner needs to be positively or negatively charged depending on the polarity of the electrostatic charge image to be developed, and a charge control agent is added to impart the desired triboelectric chargeability to the toner.

As the positive triboelectric charge control agents known in the art, nigrosine dyes, azine dyes, copper phthalocyanine pigments, quaternary ammonium salts, or polymers having quaternary ammonium salts in their side chains are known today. Etc. are known. Known negative triboelectrically charge control agents include metal complex salts of monoazo dyes, metal complex salts of salicylic acid, naphthoic acid, dicarboxylic acids and the like. However, the charge control agents are often colored and used in color toners. When used, a reproducibility problem may occur, and a charge control resin (hereinafter, abbreviated as CCR) which is almost colorless or has little coloring is attracting attention.

Various CCRs have been proposed so far. For example, Japanese Patent Publication No. 8-12467 discloses that 2-
A CCR having a structural unit of acrylamido-2-methylpropanesulfonic acid (hereinafter abbreviated as AMPS) has been proposed. Further, JP-A-11-184165, JP-A-11-184166, and JP-A-2000-56518.
Japanese Patent Application Laid-Open No. 2003-242242 proposes a toner in which a copolymer composed of vinyl aromatic hydrocarbon, (meth) acrylate, and sulfonic acid group-containing (meth) acrylamide is used as CCR. In addition, in Japanese Patent No. 2623684, a sulfonic acid group-containing acrylamide monomer is disclosed in JP-A-7-7.
2658 discloses a sulfonic acid group-containing aliphatic unsaturated -N
-Acrylamide-based monomer is disclosed in Patent No. 260935.
Following formula 8 ^{_{No.: CH 2 = CX 1 -CO-}} NH-X 2
A CCR having an acrylamide monomer represented by —SO ₃ H (wherein X ¹ is a hydrogen atom or a methyl group and X ² is a divalent hydrocarbon having 1 to 6 carbon atoms) as a constitutional unit, Proposed.

However, when the present inventor actually synthesized CCR, it was found that even if the acrylamide content in the CCR composition was the same, the charging properties differed depending on the synthesis method.

[0009]

DISCLOSURE OF THE INVENTION The present invention is environmentally stable and safe, has excellent chargeability, and when incorporated in an electrophotographic toner, has a high compatibility with a binder resin and a high dispersibility. It is an object of the present invention to provide a negatively chargeable control resin for an electrophotographic toner, which is excellent and does not impair the tint of the toner, and can perform good charge control.

[0010]

Means for Solving the Problems The present inventor has studied various indexes for finding a synthesis condition exhibiting the optimum chargeability without actually measuring the charge quantity, and as a result, the water content and the charge quantity are correlated. Therefore, the present invention has been completed.

The present invention is a negatively chargeable control resin containing acrylamidesulfonic acid or acrylamidesulfonate represented by the formula (1), styrene and / or α-methylstyrene, and (meth) acrylic acid ester as a constitutional unit. In the temperature of 22 ° C. and the humidity of 55%, the moisture content is set to 1.6% by mass or less. Preferably, it is provided by 1.2 mass% or less. Further, preferably, the acrylamide sulfonic acid or acrylamide sulfonate of the formula (1) is 0.01 to
30% by mass, styrene and / or α-methylstyrene,
And (meth) acrylic acid ester. Furthermore, it is preferable that the weight average molecular weight of CCR is 28,000 to 200,000.

[0012]

[Chemical 2] (In the formula, R ¹ , R ² , R ³ and R ⁴ are the same or different groups and represent a hydrogen atom or an aliphatic group, and X represents a hydrogen atom or an alkali metal.)

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As the acrylamidosulfonic acid of the formula (1) which is characteristically used in the present invention, compounds having the following structures can be mentioned. As those having a salt structure, sodium of the compound can be mentioned. Metals such as salts and potassium salts can be used.

[0014]

[Chemical 3]

The method for producing acrylamide sulfonic acid or acrylamide sulfonate used in the present invention is not particularly limited. For example, as shown in formula (2), the corresponding aliphatic group-containing ethylene and acrylonitrile are used. , A method of reacting fuming sulfuric acid, or the like. In this case, depending on the structure of the aliphatic group-containing ethylene, positional isomers may be formed as shown in formula (2). However, there is no problem if the mixture of positional isomers is directly used for the negatively chargeable control resin.

[0016]

[Chemical 4]

Further, Japanese Patent Publication No. 3-40019 discloses a method (formula 3) for producing acrylamide sulfonic acid or acrylamide sulfonate by reacting a nitrile compound and a hydroxyalkane sulfonic acid derivative in concentrated sulfuric acid. Has been done. However, in order to synthesize various acrylamide sulfonic acids or acrylamide sulfonates, it is preferable to use the method of the formula (2) because of the large number of starting materials.

[0018]

[Chemical 5]

The negative charge control resin of the present invention is a copolymer containing a sulfonic acid group-containing acrylamide monomer. The content of the sulfonic acid group-containing acrylamide monomer in the total amount of the monomers constituting the copolymer is 0.01 to 30% by mass, although it depends on the hygroscopicity of the sulfonic acid group-containing acrylamide monomer used. preferable. It is more preferably 0.05 to 20% by mass, and even more preferably 0.1 to 15% by mass. When the amount is less than 0.01% by mass, the triboelectric charge amount may be insufficient, which is not preferable, and when the amount is more than 30% by mass, the dispersion state of the negatively chargeable control resin in the toner particles becomes uneven. There are cases where it is not preferable.

The negative-charge controlling resin of the present invention contains styrene and / or α-methylstyrene, and a (meth) acrylic acid alkyl ester. Specific examples of the (meth) acrylic acid alkyl ester are not particularly limited, but include, for example, methyl acrylate, ethyl acrylate, -n-butyl acrylate, 2-ethylhexyl acrylate, isodecyl acrylate, and acrylic. Acid-n-lauryl, acrylic acid-n-stearyl, methoxyethylene glycol acrylate, cyclohexyl acrylate, 2-hydroxyethyl acrylate, methyl methacrylate,
Ethyl methacrylate, -n-butyl methacrylate, 2-ethylhexyl methacrylate, isodecyl methacrylate, -n-lauryl methacrylate, -n-methacrylic acid
Stearyl, methoxyethylene glycol methacrylate, cyclohexyl methacrylate, methacrylic acid-2-
Hydroxyethyl etc. can be mentioned. In particular, butyl acrylate, 2-ethylhexyl acrylate and the like can be preferably used.

The polymerization method for obtaining the negatively chargeable resin of the present invention is not particularly limited, but includes a bulk polymerization method, a solution polymerization method, an emulsion polymerization method, a suspension polymerization method and the like. The solution polymerization method is preferable because the reaction can be easily controlled.

The solvent used in the solution polymerization is not particularly limited, but xylene, toluene, ethyl acetate, isobutyl acetate, isopropyl alcohol, methanol, methyl ethyl ketone, methyl isobutyl ketone,
N, N-dimethylformamide, dimethylformamide and the like are used.

In solution polymerization, the ratio of solvent to monomer is
Although not particularly limited, 30 to 400 parts by mass of the monomer is preferably used with respect to 100 parts by mass of the solvent.

The initiator used for polymerizing the negatively chargeable resin of the present invention is not particularly limited, but t-butylperoxy-2-ethylhexanoate, cumylperpivalate, t-butyl peroxylaurate, benzoyl peroxide, lauroyl peroxide, octanoyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide,
Dicumyl peroxide, 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2, 2'-azobis (4-methoxy-
2,4-dimethylvaleronitrile) and the like, and these can be used alone or in combination.

The amount used is 0.05 to 30 parts by mass (preferably 0.1 to 15 parts by mass) with respect to 100 parts by mass of the monomer.

The reaction temperature is not particularly limited and can be set according to the solvent, initiator and monomer used, but it is preferably carried out at 40 ° C to 150 ° C.

The negative charge control resin of the present invention can be used as a negative triboelectric chargeable toner. At that time, the weight average molecular weight of the preferred copolymer is 28,000 to 200,000.
It is 0, preferably 30,000 to 100,000.
If the weight average molecular weight is less than 28,000, 20
In any case where the amount exceeds 10,000, the dispersion state of the negatively chargeable control resin in the toner particles tends to become non-uniform when added to the toner, and the triboelectric charge amount of the toner may become insufficient, which is preferable. Absent.

The glass transition point of the negative charge control resin of the present invention is not particularly limited, but is preferably in the range of 40 to 100 ° C, more preferably 50 to 90 ° C. In any case of lower than 40 ° C. or higher than 100 ° C., when added to the toner, the dispersion state of the negatively chargeable control resin in the toner particles is likely to be non-uniform, resulting in an insufficient triboelectric charge amount of the toner. May occur, which is not preferable.

Furthermore, the water content of the negative charge control resin of the present invention is preferably 1.6% by mass or less, more preferably 1.2% by mass or less. When it exceeds 1.6% by mass, the hygroscopicity is high, and the chargeability is apt to decrease.

When the negative charge control resin of the present invention is used as a negative triboelectrification toner, in addition to the charge control resin, a binder resin, a colorant, a charge control agent, a polyolefin wax,
In addition, if necessary, various additives are contained.

As the binder resin which can be used when the negative charge control resin of the present invention is added to the toner to produce the negative triboelectric chargeable toner, all known binder resins can be used.
For example, polystyrene, chloropolystyrene, poly-α
-Methylstyrene, styrene-chlorostyrene copolymer, styrene-propylene copolymer, styrene-butadiene copolymer, styrene-vinyl chloride copolymer, styrene-vinyl acetate copolymer, styrene-maleic acid copolymer, Styrene-acrylic acid ester copolymer (styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer,
Styrene-octyl acrylate copolymer, styrene-phenyl acrylate copolymer, etc.), styrene-methacrylic acid ester copolymer (styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-methacryl) Butyl acid copolymers, styrene-phenyl methacrylate copolymers, etc.), styrene-α-chloromethyl acrylate copolymers, styrene-acrylonitrile-acrylic acid ester copolymers and other styrene resins (styrene or styrene substitutes) Containing homopolymer or copolymer), vinyl chloride resin, styrene-vinyl acetate copolymer, rosin-modified maleic acid resin, phenol resin, epoxy resin, polyester resin, low molecular weight polyethylene,
There are low molecular weight polypropylene, ionomer resin, polyurethane resin, silicone resin, ketone resin, ethylene-ethyl acrylate copolymer, xylene resin, polyvinyl butyral resin, etc., but as a particularly preferable resin in the practice of the present invention, styrene resin, polyester Resin, silicone resin, epoxy resin and the like can be mentioned.
Further, the above resins are not limited to being used alone, but may be used in combination of two or more kinds.

As the colorant which can be used in the negative triboelectric charging toner containing the negatively chargeable resin of the present invention, any suitable pigment or dye can be mentioned. Toner colorants are well known, and for example, pigments such as carbon black, aniline black, acetylene black, naphthol yellow,
Hansa Yellow, Quinoline Yellow, First Yellow G, Benzidine Yellow, Malachite Green, Phthalocyanine Green, Brilliant Green, Rhodamine Lake, Alizarin Lake, Bengala, Permanent Red, Irgacine Red, Toluidine Red, Phthalocyanine Blue, Indanthrene Blue, Aniline Blue , Ultra Marine Blue, etc.

The charge control agent that can be used in the negative triboelectric charging toner containing the negative charge control resin of the present invention is not particularly limited, but metal complex salts of monoazo dyes, salicylic acid, naphthoic acid, Examples include metal complex salts of dicarboxylic acids, copper phthalocyanine pigments, etc.

The wax that can be used in the negative triboelectric charging toner containing the negative charge control resin of the present invention is not particularly limited, but as a wax preferably used, olefin is radically polymerized under high pressure. Polyolefins; polyolefins obtained by purifying low molecular weight by-products obtained during polymerization of high molecular weight polyolefins; polyolefins polymerized under low pressure using catalysts such as Ziegler catalysts and metallocene catalysts; polyolefins polymerized using radiation, electromagnetic waves or light; Low molecular weight polyolefins obtained by pyrolyzing high molecular weight polyolefins; paraffin wax; microcrystalline wax; Fischer-Tropsch wax; synthetic hydrocarbon wax synthesized by the Zintor method, Hydrocoal method or Arge method; Synthetic wax having a substance as a monomer; a hydrocarbon wax having a functional group such as a hydroxyl group or a carboxyl group; a mixture of a hydrocarbon wax and a hydrocarbon wax having a functional group; styrene and maleic acid using these waxes as a base material Examples thereof include graft-modified wax graft-modified with a vinyl monomer such as ester, acrylate, methacrylate and maleic anhydride.

A known external additive may be added to the negative triboelectric charging toner containing the negative charge control resin of the present invention in order to control fluidity and developability. As the external additive, various inorganic oxide fine particles such as silica, alumina, and titania (which are subjected to a hydrophobic treatment if necessary) and the like can be used.

The method of adding the negative charge control resin of the present invention to the toner to produce a negative triboelectric charging toner is not particularly limited. For example, the method of producing a pulverized toner includes CCR, Binder resin, dye / pigment as a colorant, magnetic material, carbon black, and other additives, if necessary, are sufficiently mixed with a mixer such as a Henschel mixer or a ball mill, and then a heating roll, a kneader,
Melt and knead using a heat kneader such as an extruder to make the resins and colorants compatible with each other and disperse, and after cooling and solidifying, pulverizing and classifying the obtained toner particles, silica, alumina, etc. The external additive can be externally added using a mixer such as a Henschel mixer to obtain the chargeable toner according to the present invention. Further, as a method for producing a polymerized toner,
CCR, colorant, monomer, wax, polymerization initiator and the like are suspended and granulated in a water system using a dispersant to obtain dispersed particles having a predetermined particle size distribution in which wax is encapsulated, and then heated to obtain a polymerized toner. After the particles are obtained, washed and dried, an external additive such as silica is added to obtain the chargeable toner according to the present invention.

[0037]

EXAMPLES The present invention will now be specifically described with reference to examples, but the present invention is not limited to the examples.

Example 1 Production of CCR1 : Styrene 4 was placed in a 4-neck separable flask equipped with a stirrer, a cooler, a thermometer and a nitrogen inlet tube.
6.8 g, 2-ethylhexyl acrylate 9.0 g,
4.2 g of the following acrylamide sulfonic acid (1), 16 g of toluene, 24 g of methanol and 2.4 g of 2,2′-azobis (2-methylbutyronitrile) were charged, stirred, and solution polymerized at 65 ° C. for 8 hours under nitrogen introduction. did. afterwards,
CCR1 was obtained by drying under reduced pressure.

[0039]

[Chemical 6]

The CCR1 thus obtained had a weight average molecular weight (Mw) of 54,800 as measured by GPC and a Tg of 70.5 ° C. as measured by DSC. In addition, ¹ H-NMR was measured. The results are shown in Fig. 1. Furthermore, when the sulfur content was measured, it was 1.07% by mass. When the content of acrylamidesulfonic acid (1) in CCR1 was calculated from the sulfur content and compared with the theoretical value calculated from the charged amount of the monomer, it was found that they were almost the same.

From the above results, it was confirmed that CCR1 was a copolymer of styrene, 2-ethylhexyl acrylate and acrylamidosulfonic acid (1), and the content of acrylamidosulfonic acid (1) was a desired value. .

Measurement of molecular weight GPC measuring device: HLC-8120 GPC (manufactured by Tosoh Corporation) Column: KD-805L 30 cm 2 stations (manufactured by Showa Denko KK) Temperature: 40 ° C. Solvent: THF Flow rate: 1.0 ml / min Sample: 0.25% 0.1 ml of the sample was injected, the column was stabilized in a heat chamber at 40 ° C., and about 100 μl of the sample solution was injected into the column at this temperature for measurement. In measuring the molecular weight of the sample, the molecular weight distribution of the sample was calculated from the relationship between the logarithmic value and the count value of the calibration curve prepared from several kinds of monodisperse polystyrene standard samples. As a standard polystyrene sample for preparing a calibration curve, a molecular weight of 2.5 × 10 ³ , 5.8 manufactured by Tosoh Corporation is used.
7 × 10 ³ , 9.49 × 10 ³ , 1.71 × 10 ⁴ , 3.
72 × 10 ⁴ , 9.89 × 10 ⁴ , 1.89 × 10 ⁵ ,
3.97 × 10 ⁵ , 7.07 × 10 ⁵ , 1.11 × 10 ⁶
The standard polystyrene sample of was used. In addition, the detector is RI
A (refractive index) detector was used.

The weight average molecular weight was calculated from the molecular weight distribution by GPC obtained by the above method. When calculating
The baseline of the molecular weight distribution peak was a line connecting the measurement start point and the measurement end point. Moreover, in order to remove the influence of additives in the solvent, the calculation range is 3000-11100 in the molecular weight range.
It was set to 00. The results are shown in Table 1.

Measurement of triboelectric charge The obtained CCR1 was crushed and classified. When the volume average particle size was measured with a Multisizer (manufactured by Beckman Coulter, Inc.), it was about 4 μm. Iron powder carrier and 5 to 95
The mixture was mixed at a ratio of 1 and shaken for 1 minute to cause triboelectrification. The apparatus shown in FIG. 2 was used to measure the charge amount. The triboelectrified mixture was placed in a metal measuring container 2 having a conductive screen 3 of 400 mesh at the bottom (the size can be changed so that carrier particles do not pass), and a lid 4 made of metal was placed. At this time, the mass of the entire measuring container was weighed to obtain W ₁ [g]. Next, in the suction device 1 (at least the portion in contact with the measurement container 2 is an insulator), suction is performed from the suction port 7, the air volume control valve 6 is adjusted, and the pressure of the vacuum gauge 5 is set to 1.5 kPa to perform suction. , Removed by suction. After the suction, the charge was measured and the result was Q [μC]. Further, the mass of the entire measurement container after suction was weighed and designated as W ₂ [g]. The triboelectric charge amount was calculated by the following formula. Tribo value [μC / g] = Q / (W ₁ −W ₂ ).

The above-mentioned measurement of the triboelectric charge amount was carried out at room temperature and normal humidity (N /
N) Performed in an environment (22 ° C., 55% RH). The results are shown in Table 1.
Shown in.

Measurement of Moisture Content The CCR1 thus obtained was allowed to stand overnight or more in a room temperature and normal humidity environment, and then the moisture content was measured by the Karl Fischer method. The results are shown in Table 1.

[Example 2] Production of CCR2 : 4 ports equipped with a stirrer, a cooler, a nitrogen introducing tube and a dropping funnel [containing a mixture of 2.1 g of acrylamidosulfonic acid (1) and 20 g of methanol] In a separable flask, 46.8 g of styrene, 9.0 g of 2-ethylhexyl acrylate, 2.4 g of 2,2′-azobis (2-methylbutyronitrile), 2.1 g of acrylamidosulfonic acid (1), 20 g of methanol. And stirring at 65 ° C. under nitrogen introduction. After the reflux started, solution polymerization was carried out for 8 hours while adding dropwise over 5 hours.
Then, it dried under reduced pressure and obtained CCR2. GPC, DSC, sulfur content, and ¹ H-NMR were measured in the same manner as in Example 1. It was confirmed that CCR2 was a copolymer of styrene, 2-ethylhexyl acrylate and acrylamidosulfonic acid (1), and the content of acrylamidosulfonic acid (1) was compared with the theoretical value.

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Example 3 Preparation of CCR3 : CCR3 was prepared by the same method as in Example 1 except that 46.8 g of styrene was replaced with a mixed solution of 23.4 g of styrene and 26.5 g of α-methylstyrene.
3 was produced. GPC, DSC, sulfur content, and ¹ H-NMR were measured in the same manner as in Example 1. From the above results CC
R3 is styrene, α-methylstyrene, acrylic acid-2
It was confirmed that the content of acrylamidesulfonic acid (1) was a desired value because it was a copolymer of ethylhexyl and acrylamidesulfonic acid (1).

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Example 4 Production of CCR4 : Styrene 4 was placed in a 4-neck separable flask equipped with a stirrer, a cooler, a thermometer and a nitrogen inlet tube.
6.8 g, 2-ethylhexyl acrylate 9.0 g,
4.2 g of acrylamide sulfonic acid (1) was charged, and 0.7 g of benzoyl peroxide was further added and mixed and dissolved. An aqueous solution containing 3 g of tricalcium phosphate, 0.3 g of sodium lauryl sulfate, and 210 g of deionized water was added, and the mixture was heated to 80 ° C. with stirring to carry out a polymerization reaction for 6 hours.
The mixture was heated to 0 ° C. to carry out a polymerization reaction for 4 hours. Thereafter, filtration, washing with water, washing with water, washing with water were carried out, and drying was performed to obtain CCR4. GPC, DSC, sulfur content, as in Example 1, ¹
1 H-NMR was measured. It was confirmed that CCR4 was a copolymer of styrene, 2-ethylhexyl acrylate and acrylamidosulfonic acid (1), and the content of acrylamidosulfonic acid (1) was compared with the theoretical value.

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Example 5 Production of CCR5 : CCR5 was produced by the same method as in Example 1 except that 2.4 g of 2,2′-azobis (2-methylbutyronitrile) was used as 4.0 g. did. GPC, DSC, sulfur content, ¹ H-NMR as in Example 1.
Was measured. From the above results, it was confirmed that CCR5 was a copolymer of styrene, 2-ethylhexyl acrylate and acrylamidosulfonic acid (1), and the content of acrylamidosulfonic acid (1) was a desired value.

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Example 6 Production of CCR6 : Acrylamide sulfonic acid (1) 4.
CCR6 was produced in the same manner as in Example 1 except that 4.7 g of sodium salt of acrylamidosulfonic acid (1) was used instead of 2 g. The sulfur content was measured in the same manner as in Example 1.

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Comparative Example 1 Production of CCR7 : CCR7 was produced by the same method as in Example 1 using 40 g of methanol as a polymerization solvent. By measuring GPC, DSC, sulfur content, and ¹ H-NMR in the same manner as in Example 1, CCR7 was a copolymer of styrene, 2-ethylhexyl acrylate, and acrylamidosulfonic acid (1). It was confirmed that the content of the acid (1) was a desired value.

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Comparative Example 2 Production of CCR8 : Acrylamide sulfonic acid (1) 4.
CCR8 was produced by the same method as in Comparative Example 1 except that 2 g was changed to 30.0 g. GP as in Example 1
By measuring C, DSC, sulfur content and ¹ H-NMR, CCR8 is a copolymer of styrene, 2-ethylhexyl acrylate and acrylamidosulfonic acid (1), and the content of acrylamidosulfonic acid (1) It was confirmed that the amount was the desired value.

The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

[Comparative Example 3] Production of CCR9 : CCR9 was prepared by the same method as in Example 1 except that acrylamide sulfonic acid (1) was not added.
R9 was produced. GPC, DSC, ¹ as in Example ¹
1 H-NMR was measured. The particles were pulverized and classified to have the same average particle size as in Example 1, and the triboelectric charge amount and the water content were measured. Table 1 shows the measurement results of the triboelectric charge amount and the water content.

Table 2 shows the state of acrylamide sulfonic acid during polymerization in Examples and Comparative Examples.

[0063]

[Table 1]

[0064]

[Table 2]

Color image test : Binder resin (styrene-
Butyl acrylate copolymer) 2500 parts by mass, negatively chargeable control resins (CCR1 to CCR9) 50 parts by mass, phthalocyanine blue 100 parts by mass are kneaded, pulverized and classified, and hydrophobic silica is 2% by mass with respect to the toner. Externally added to obtain a cyan toner.

The image characteristics of each toner were evaluated in an environment of normal temperature and normal humidity (22 ° C., 55%) with a color digital copying machine 1130 manufactured by Canon Inc. for an initial image and a durable image after 5,000 copies. Fog is a reflection measuring instrument REFLE for fog measurement.
By CTMETER (Tokyo Denshoku Co., Ltd.), the whiteness of the white background of the image after the initial endurance and after endurance is measured, and the fog density is calculated from the difference between the whiteness and the whiteness of the plain paper (transfer paper), and then evaluated. did. Further, the OHP transparency was evaluated by transferring the cyan toner image onto an OHP film and transmitting the fixed image through an overhead projector. The respective evaluation results are summarized in Table 3.

Evaluation of image density A: 1.4 or more B: 1.3 or more and less than 1.4 C: 1.2 or more and less than 1.3 D: less than 1.2

Evaluation of Fog A: Very good (less than 2.0%) B: Good (2.0% or more and less than 3.0%) C: Poor (3.0% or more)

Evaluation of OHP transparency A: Good (excellent transparency, no uneven brightness and excellent color reproducibility) B: Normal (slight uneven brightness, but no problem in practical use) C : Poor (there is uneven brightness and the color reproducibility is poor.)

[0070]

[Table 3]

In Examples 1 to 3, all the claims were satisfied, the charging characteristics were good, and the image characteristics when made into toner were also good. In Examples 4 and 5, the weight average molecular weight of CCR is more than 200,000 and less than 28,000. Therefore, the dispersion state of the negatively chargeable control resin in the toner particles is likely to be non-uniform when added to the toner. However, the triboelectric charge amount of the toner became insufficient, and fogging occurred in the color image test.

[0072]

According to the present invention, a negatively chargeable control resin having a sufficient charge amount can be obtained.

[Brief description of drawings]

FIG. 1 is a ¹ H-NMR measurement diagram of CCR1 in Experimental Example 1.

FIG. 2 is a schematic view of an apparatus used for measuring a triboelectric charge amount.

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Claims (4)

[Claims] 1. A charge control resin containing acrylamidosulfonic acid or acrylamidosulfonate represented by formula (1), styrene and / or α-methylstyrene, and (meth) acrylic acid ester as a constitutional unit at a temperature of Water content is 1.6 at 22 ° C and 55% humidity
A negatively chargeable control resin characterized by being less than or equal to mass%. [Chemical 1] (In the formula, R ¹ , R ² , R ³ and R ⁴ are the same or different groups and represent a hydrogen atom or an aliphatic group, and X represents a hydrogen atom or an alkali metal.) 2. In the formula (1), R ¹ and R ² are methyl groups, and R ³
The negative-charge controlling resin according to claim 1, wherein R ⁴ and R ⁴ are hydrogen atoms. 3. 0.01 to 30% by mass of acrylamide sulfonic acid or acrylamide sulfonate of formula (1)
The negative charge control resin according to claim 1 or 2, wherein the negative charge control resin is contained. 4. A weight average molecular weight of 28,000 to 20.
The negative chargeability control resin according to claim 1, wherein the negative chargeability control resin is 10,000.